Author: "Université de Montpellier 2 (FRANCE)" - Searchworks@Jio Institute Digital Library Search Results

Your search keyword '"Université de Montpellier 2 (FRANCE)"' showing total 119 results

Start Over Author "Université de Montpellier 2 (FRANCE)"

119 results on '"Université de Montpellier 2 (FRANCE)"'

1. Efficiency of plasma elaborated sub-stoichiometric titanium oxide (Ti4O7) ceramic electrode for advanced electrochemical degradation of paracetamol in different electrolyte media

Author: Soliu O. Ganiyu, Marc Cretin, Stéphane Raffy, Christel Causserand, Mehmet A. Oturan, Nihal Oturan, Centre National de la Recherche Scientifique - CNRS (FRANCE), Ecole Nationale Supérieure de Chimie de Montpellier - ENSCM (FRANCE), Institut National Polytechnique de Toulouse - Toulouse INP (FRANCE), Saint-Gobain (FRANCE), Université Toulouse III - Paul Sabatier - UT3 (FRANCE), Université de Montpellier 2 (FRANCE), Université Paris-Est Marne-La-Vallée - UPEM (FRANCE), Université de Montpellier (FRANCE), Institut Européen des Membranes - IEM (Montpellier, France), Laboratoire Géomatériaux et Environnement (LGE), Université Paris-Est Marne-la-Vallée (UPEM), SAINT-GOBAIN CREe, Institut Européen des membranes (IEM), Centre National de la Recherche Scientifique (CNRS)-Ecole Nationale Supérieure de Chimie de Montpellier (ENSCM)-Université Montpellier 2 - Sciences et Techniques (UM2)-Institut de Chimie du CNRS (INC)-Université de Montpellier (UM), Laboratoire de Génie Chimique (LGC), Université Toulouse III - Paul Sabatier (UT3), Université Fédérale Toulouse Midi-Pyrénées-Université Fédérale Toulouse Midi-Pyrénées-Centre National de la Recherche Scientifique (CNRS)-Institut National Polytechnique (Toulouse) (Toulouse INP), Université Fédérale Toulouse Midi-Pyrénées, Ecole Nationale Supérieure de Chimie de Montpellier (ENSCM)-Institut de Chimie du CNRS (INC)-Université de Montpellier (UM)-Centre National de la Recherche Scientifique (CNRS), and Institut National Polytechnique de Toulouse - INPT (FRANCE)
Subjects: Hydroxyl radicals, Anodic oxidation, Supporting electrolyte, chemistry.chemical_element, Filtration and Separation, 02 engineering and technology, Electrolyte, Electrochemistry, 7. Clean energy, Analytical Chemistry, [CHIM.GENI]Chemical Sciences/Chemical engineering, 020401 chemical engineering, [CHIM.ANAL]Chemical Sciences/Analytical chemistry, Chlorine, Génie chimique, [SPI.GPROC]Engineering Sciences [physics]/Chemical and Process Engineering, 0204 chemical engineering, Génie des procédés, TOC removal efficiency, [CHIM.CATA]Chemical Sciences/Catalysis, [CHIM.MATE]Chemical Sciences/Material chemistry, 021001 nanoscience & nanotechnology, 6. Clean water, Anode, Titanium oxide, chemistry, Chemical engineering, Ti4O7-ceramic anode, Electrode, Electro-Fenton, Degradation (geology), 0210 nano-technology
Abstract: International audience; This paper investigates the behavior of conductive Ti4O7 ceramic anode in different electrolytes during the degradation of the anti-inflammatory drug paracetamol (PCM) by advanced electrochemical oxidation processes mainly anodic oxidation with generation of H2O2 (AO-H2O2) and electro-Fenton (EF). Regardless of the medium, better degradation and mineralization efficiency was always observed with EF compared to AO-H2O2. The degradation of PCM was carried out by hydroxyl radical (OH) produced on the anode surface from water oxidation and mediated oxidation in the solution from oxidant species generated at the anode such as sulfate radicals and active chlorine species depending on the supporting electrolytes used, as well as OH generated homogeneously in the solution by electrochemically assisted Fenton’s reaction. Faster degradation was observed in Cl− compared to other media, but the solution was poorly mineralized. Highest total organic (TOC) removal efficiency with excellent degradation rate was attained in SO42− with either process, thus remain the best medium for advanced electrochemical wastewater treatment. Comparative studies with dimensional stable anode (DSA) and boron-doped diamond anode (BDD) showed similar trend of degradation and TOC removal efficiency with DSA anode achieving low mineralization power compared to Ti4O7 anode, whereas BDD showed slightly better efficiency than Ti4O7 in all electrolytes studied. The analysis of concentration of generated active chlorine species, especially ClO−, during AO-H2O2 decreased in the order: DSA > Ti4O7 > BDD. Therefore, the Ti4O7 electrode was found to be a promising anode material for an efficient treatment of PCM in SO42−, NO3− and ClO4− media but less effective in Cl− medium.
Published: 2019
Full Text: View/download PDF

2. A Forty-Year Karstic Critical Zone Survey (Baget Catchment, Pyrenees-France): Lithologic and Hydroclimatic Controls on Seasonal and Inter-Annual Variations of StreamWater Chemical Composition, pCO2, and Carbonate Equilibrium

Author: Virginie Payre-Suc, Anne Probst, Sandra Beranger, Jean-Luc Probst, Francesco Ulloa-Cedamanos, Thierry Camboulive, Michel Bakalowicz, Corinne Pautot, Stéphane Binet, Laboratoire Ecologie Fonctionnelle et Environnement (ECOLAB), Institut Ecologie et Environnement (INEE), Centre National de la Recherche Scientifique (CNRS)-Centre National de la Recherche Scientifique (CNRS)-Université Toulouse III - Paul Sabatier (UT3), Université Fédérale Toulouse Midi-Pyrénées-Université Fédérale Toulouse Midi-Pyrénées-Observatoire Midi-Pyrénées (OMP), Météo France-Centre National d'Études Spatiales [Toulouse] (CNES)-Université Fédérale Toulouse Midi-Pyrénées-Centre National de la Recherche Scientifique (CNRS)-Institut de Recherche pour le Développement (IRD)-Météo France-Centre National d'Études Spatiales [Toulouse] (CNES)-Centre National de la Recherche Scientifique (CNRS)-Institut de Recherche pour le Développement (IRD)-Centre National de la Recherche Scientifique (CNRS)-Institut National Polytechnique (Toulouse) (Toulouse INP), Université Fédérale Toulouse Midi-Pyrénées, Institut des Sciences de la Terre d'Orléans - UMR7327 (ISTO), Bureau de Recherches Géologiques et Minières (BRGM) (BRGM)-Observatoire des Sciences de l'Univers en région Centre (OSUC), Institut national des sciences de l'Univers (INSU - CNRS)-Observatoire de Paris, Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL)-Université d'Orléans (UO)-Centre National de la Recherche Scientifique (CNRS)-Institut national des sciences de l'Univers (INSU - CNRS)-Observatoire de Paris, Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL)-Université d'Orléans (UO)-Centre National de la Recherche Scientifique (CNRS)-Institut national des sciences de l'Univers (INSU - CNRS)-Université d'Orléans (UO)-Centre National de la Recherche Scientifique (CNRS), Biogéosystèmes Continentaux - UMR7327, Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL)-Université d'Orléans (UO)-Centre National de la Recherche Scientifique (CNRS)-Institut national des sciences de l'Univers (INSU - CNRS)-Université d'Orléans (UO)-Centre National de la Recherche Scientifique (CNRS)-Bureau de Recherches Géologiques et Minières (BRGM) (BRGM)-Observatoire des Sciences de l'Univers en région Centre (OSUC), Hydrosciences Montpellier (HSM), Institut de Recherche pour le Développement (IRD)-Université Montpellier 2 - Sciences et Techniques (UM2)-Institut national des sciences de l'Univers (INSU - CNRS)-Université de Montpellier (UM)-Centre National de la Recherche Scientifique (CNRS), Bureau de Recherches Géologiques et Minières (BRGM) (BRGM), Centre National de la Recherche Scientifique - CNRS (FRANCE), Institut National Polytechnique de Toulouse - Toulouse INP (FRANCE), Institut de Recherche pour le Développement - IRD (FRANCE), Université Toulouse III - Paul Sabatier - UT3 (FRANCE), Université de Montpellier 2 (FRANCE), Bureau de Recherches Géologiques et Minières - BRGM (FRANCE), Institut national des sciences de l'Univers - INSU (FRANCE), Université Toulouse III - Paul Sabatier (UT3), Université Fédérale Toulouse Midi-Pyrénées-Université Fédérale Toulouse Midi-Pyrénées-Institut Ecologie et Environnement (INEE), Centre National de la Recherche Scientifique (CNRS)-Centre National de la Recherche Scientifique (CNRS)-Institut National Polytechnique (Toulouse) (Toulouse INP), Université Fédérale Toulouse Midi-Pyrénées-Observatoire Midi-Pyrénées (OMP), Météo France-Centre National d'Études Spatiales [Toulouse] (CNES)-Université Fédérale Toulouse Midi-Pyrénées-Centre National de la Recherche Scientifique (CNRS)-Institut de Recherche pour le Développement (IRD)-Météo France-Centre National d'Études Spatiales [Toulouse] (CNES)-Centre National de la Recherche Scientifique (CNRS)-Institut de Recherche pour le Développement (IRD)-Centre National de la Recherche Scientifique (CNRS), Institut national des sciences de l'Univers (INSU - CNRS)-Centre National de la Recherche Scientifique (CNRS)-Université d'Orléans (UO)-Observatoire de Paris, Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL)-Institut national des sciences de l'Univers (INSU - CNRS)-Centre National de la Recherche Scientifique (CNRS)-Université d'Orléans (UO)-Observatoire de Paris, Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL)-Institut national des sciences de l'Univers (INSU - CNRS)-Université d'Orléans (UO)-Centre National de la Recherche Scientifique (CNRS), Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL)-Institut national des sciences de l'Univers (INSU - CNRS)-Université d'Orléans (UO)-Centre National de la Recherche Scientifique (CNRS)-Bureau de Recherches Géologiques et Minières (BRGM) (BRGM)-Observatoire des Sciences de l'Univers en région Centre (OSUC), Institut national des sciences de l'Univers (INSU - CNRS)-Institut de Recherche pour le Développement (IRD)-Université Montpellier 2 - Sciences et Techniques (UM2)-Université de Montpellier (UM)-Centre National de la Recherche Scientifique (CNRS), CNRS INEE, CNRS-INSU, SNO KARST, OZCAR, Zone Atelier Pyrénées-Garonne (LTSER ZA PYGAR), Centre National de la Recherche Scientifique (CNRS)-Observatoire Midi-Pyrénées (OMP), Institut de Recherche pour le Développement (IRD)-Centre National de la Recherche Scientifique (CNRS)-Université Fédérale Toulouse Midi-Pyrénées-Centre National d'Études Spatiales [Toulouse] (CNES)-Météo France-Institut de Recherche pour le Développement (IRD)-Centre National de la Recherche Scientifique (CNRS)-Université Fédérale Toulouse Midi-Pyrénées-Centre National d'Études Spatiales [Toulouse] (CNES)-Météo France-Institut National Polytechnique (Toulouse) (Toulouse INP), Université Fédérale Toulouse Midi-Pyrénées-Institut Ecologie et Environnement (INEE), Centre National de la Recherche Scientifique (CNRS)-Université Toulouse III - Paul Sabatier (UT3), Centre National de la Recherche Scientifique (CNRS)-Université d'Orléans (UO)-Institut national des sciences de l'Univers (INSU - CNRS)-Observatoire des Sciences de l'Univers en région Centre (OSUC), Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL)-Université d'Orléans (UO)-Centre National de la Recherche Scientifique (CNRS)-Bureau de Recherches Géologiques et Minières (BRGM) (BRGM), Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL)-Université d'Orléans (UO)-Centre National de la Recherche Scientifique (CNRS)-Bureau de Recherches Géologiques et Minières (BRGM) (BRGM)-Centre National de la Recherche Scientifique (CNRS)-Université d'Orléans (UO)-Institut national des sciences de l'Univers (INSU - CNRS)-Observatoire des Sciences de l'Univers en région Centre (OSUC), Laboratoire Ecologie Fonctionnelle et Environnement (LEFE), Université de Toulouse (UT)-Université de Toulouse (UT)-Observatoire Midi-Pyrénées (OMP), Institut de Recherche pour le Développement (IRD)-Université Toulouse III - Paul Sabatier (UT3), Université de Toulouse (UT)-Université de Toulouse (UT)-Institut national des sciences de l'Univers (INSU - CNRS)-Centre National d'Études Spatiales [Toulouse] (CNES)-Centre National de la Recherche Scientifique (CNRS)-Météo-France -Institut de Recherche pour le Développement (IRD)-Institut national des sciences de l'Univers (INSU - CNRS)-Centre National d'Études Spatiales [Toulouse] (CNES)-Centre National de la Recherche Scientifique (CNRS)-Météo-France -Centre National de la Recherche Scientifique (CNRS)-Institut National Polytechnique (Toulouse) (Toulouse INP), Université de Toulouse (UT), and Institut de Recherche pour le Développement (IRD)-Institut national des sciences de l'Univers (INSU - CNRS)-Université de Montpellier (UM)-Centre National de la Recherche Scientifique (CNRS)
Subjects: Biogeochemical cycle, lcsh:Hydraulic engineering, Seasonal patterns, 010504 meteorology & atmospheric sciences, Long-term monitoring, [SDE.MCG]Environmental Sciences/Global Changes, Geography, Planning and Development, Alkalinity, Drainage basin, Aquatic Science, [SDV.SA.SDS]Life Sciences [q-bio]/Agricultural sciences/Soil study, 010502 geochemistry & geophysics, 01 natural sciences, Biochemistry, chemistry.chemical_compound, [SDV.EE.ECO]Life Sciences [q-bio]/Ecology, environment/Ecosystems, lcsh:Water supply for domestic and industrial purposes, lcsh:TC1-978, [SDU.STU.GC]Sciences of the Universe [physics]/Earth Sciences/Geochemistry, Carbonate dissolution, Sulfate, [SDU.STU.HY]Sciences of the Universe [physics]/Earth Sciences/Hydrology, [SDU.ENVI]Sciences of the Universe [physics]/Continental interfaces, environment, Mountainous catchment, Hydrologie, 0105 earth and related environmental sciences, Water Science and Technology, Hydrochemical trends, Hydrology, Calcite, geography, lcsh:TD201-500, geography.geographical_feature_category, [SDE.IE]Environmental Sciences/Environmental Engineering, Keywords: long-term monitoring, Global warming, 15. Life on land, Karst, 6. Clean water, Mineral weathering, chemistry, 13. Climate action, Soil water, Environmental science, Carbonate, [SDV.TOX.ECO]Life Sciences [q-bio]/Toxicology/Ecotoxicology, [SDE.BE]Environmental Sciences/Biodiversity and Ecology
Abstract: The long-term trends and seasonal patterns of stream water chemical composition in a small remote forested karst catchment, were investigated from 1978 to 2018. Calcium, magnesium, and bicarbonates, the dominant ions, increased over the period together with temperature, while sulfates decreased. Carbonate and sulfate mineral dissolution was the main source of these elements. These trends and the seasonal opposite patterns of discharge vs. temperature, calcite saturation index vs. pCO2 and bicarbonate vs. sulfates, suggested the influence of discharge, of reduced long-range atmospheric pollution, and of increasing air temperature on biological activity and carbonate dissolution. Furthermore, the hydrological regime controlled the seasonal stream water chemical composition and fluxes by: (i) a dilution during the high discharge period, (ii) a change in the contribution rate of the waters draining different lithological areas in the catchment, e.g., the increased sulfates to bicarbonates ratio during summer low flows, with a maximum alkalinity decrease of 24%, and (iii) a &ldquo, piston&rdquo, and a &ldquo, flushing&rdquo, effects of dissolved elements stored in soils and epikarst with the first autumn heavy rains. Long-term stream water hydrochemical surveys of karst system have proved to be powerful indicators of biogeochemical processes, water sources and pathways under variable natural and anthropogenic environmental pressure conditions.
Published: 2020
Full Text: View/download PDF

3. Global warming and acid atmospheric deposition impacts on carbonate dissolution and CO2 fluxes in French karst hydrosystems: evidence from hydrochemical monitoring in recent decades

Author: Stéphane Binet, Jean-Luc Seidel, Jean-Baptiste Charlier, Michel Bakalowicz, Jean-Luc Probst, Chritophe Emblanch, Nicolas Peyraube, Chritelle Batiot, Anne Probst, Service National d'Observation sur le KARST (SNO Karst), Institut national des sciences de l'Univers (INSU - CNRS), Institut des Sciences de la Terre d'Orléans - UMR7327 (ISTO), Bureau de Recherches Géologiques et Minières (BRGM) (BRGM)-Observatoire des Sciences de l'Univers en région Centre (OSUC), Institut national des sciences de l'Univers (INSU - CNRS)-Observatoire de Paris, Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL)-Université d'Orléans (UO)-Centre National de la Recherche Scientifique (CNRS)-Institut national des sciences de l'Univers (INSU - CNRS)-Observatoire de Paris, Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL)-Université d'Orléans (UO)-Centre National de la Recherche Scientifique (CNRS)-Institut national des sciences de l'Univers (INSU - CNRS)-Université d'Orléans (UO)-Centre National de la Recherche Scientifique (CNRS), Biogéosystèmes Continentaux - UMR7327, Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL)-Université d'Orléans (UO)-Centre National de la Recherche Scientifique (CNRS)-Institut national des sciences de l'Univers (INSU - CNRS)-Université d'Orléans (UO)-Centre National de la Recherche Scientifique (CNRS)-Bureau de Recherches Géologiques et Minières (BRGM) (BRGM)-Observatoire des Sciences de l'Univers en région Centre (OSUC), Laboratoire Ecologie Fonctionnelle et Environnement (ECOLAB), Université Toulouse III - Paul Sabatier (UT3), Université Fédérale Toulouse Midi-Pyrénées-Université Fédérale Toulouse Midi-Pyrénées-Institut Ecologie et Environnement (INEE), Centre National de la Recherche Scientifique (CNRS)-Centre National de la Recherche Scientifique (CNRS)-Institut National Polytechnique (Toulouse) (Toulouse INP), Université Fédérale Toulouse Midi-Pyrénées-Observatoire Midi-Pyrénées (OMP), Météo France-Centre National d'Études Spatiales [Toulouse] (CNES)-Université Fédérale Toulouse Midi-Pyrénées-Centre National de la Recherche Scientifique (CNRS)-Institut de Recherche pour le Développement (IRD)-Météo France-Centre National d'Études Spatiales [Toulouse] (CNES)-Centre National de la Recherche Scientifique (CNRS)-Institut de Recherche pour le Développement (IRD)-Centre National de la Recherche Scientifique (CNRS), Hydrosciences Montpellier (HSM), Institut national des sciences de l'Univers (INSU - CNRS)-Institut de Recherche pour le Développement (IRD)-Université Montpellier 2 - Sciences et Techniques (UM2)-Université de Montpellier (UM)-Centre National de la Recherche Scientifique (CNRS), Environnement Méditerranéen et Modélisation des Agro-Hydrosystèmes (EMMAH), Avignon Université (AU)-Institut National de Recherche pour l’Agriculture, l’Alimentation et l’Environnement (INRAE), Avignon Université (AU), Institut de Mécanique et d'Ingénierie de Bordeaux (I2M), Institut National de la Recherche Agronomique (INRA)-Université de Bordeaux (UB)-École Nationale Supérieure d'Arts et Métiers (ENSAM), Arts et Métiers Sciences et Technologies, HESAM Université (HESAM)-HESAM Université (HESAM)-Arts et Métiers Sciences et Technologies, HESAM Université (HESAM)-HESAM Université (HESAM)-Institut Polytechnique de Bordeaux-Centre National de la Recherche Scientifique (CNRS), Bureau de Recherches Géologiques et Minières (BRGM) (BRGM), French KARST Observatory Network SNO KARST (www.sokarst.org) initiative of the INSU/CNRS, PSL Research University (PSL)-PSL Research University (PSL)-Université d'Orléans (UO)-Centre National de la Recherche Scientifique (CNRS)-Institut national des sciences de l'Univers (INSU - CNRS)-Observatoire de Paris, PSL Research University (PSL)-PSL Research University (PSL)-Université d'Orléans (UO)-Centre National de la Recherche Scientifique (CNRS)-Institut national des sciences de l'Univers (INSU - CNRS)-Université d'Orléans (UO)-Centre National de la Recherche Scientifique (CNRS), PSL Research University (PSL)-PSL Research University (PSL)-Université d'Orléans (UO)-Centre National de la Recherche Scientifique (CNRS)-Institut national des sciences de l'Univers (INSU - CNRS)-Université d'Orléans (UO)-Centre National de la Recherche Scientifique (CNRS)-Bureau de Recherches Géologiques et Minières (BRGM) (BRGM)-Observatoire des Sciences de l'Univers en région Centre (OSUC), Université Fédérale Toulouse Midi-Pyrénées-Université Fédérale Toulouse Midi-Pyrénées-Observatoire Midi-Pyrénées (OMP), Université Fédérale Toulouse Midi-Pyrénées-Centre National de la Recherche Scientifique (CNRS)-Institut National Polytechnique (Toulouse) (Toulouse INP), Université Fédérale Toulouse Midi-Pyrénées, Institut de Recherche pour le Développement (IRD)-Université Montpellier 2 - Sciences et Techniques (UM2)-Université de Montpellier (UM)-Centre National de la Recherche Scientifique (CNRS), Bordeaux INP - BINP (FRANCE), Centre National de la Recherche Scientifique - CNRS (FRANCE), Institut National Polytechnique de Toulouse - Toulouse INP (FRANCE), Institut national de recherche pour l'agriculture, l'alimentation et l'environnement - INRAE (FRANCE), Institut de Recherche pour le Développement - IRD (FRANCE), Université Toulouse III - Paul Sabatier - UT3 (FRANCE), Université de Montpellier 2 (FRANCE), Bureau de Recherches Géologiques et Minières - BRGM (FRANCE), Institut national des sciences de l'Univers - INSU (FRANCE), Université d'Avignon et des Pays de Vaucluse (FRANCE), Université de Bordeaux (FRANCE), Laboratoire Ecologie Fonctionnelle et Environnement (LEFE), Institut Ecologie et Environnement (INEE), Centre National de la Recherche Scientifique (CNRS)-Centre National de la Recherche Scientifique (CNRS)-Université Toulouse III - Paul Sabatier (UT3), Université de Toulouse (UT)-Université de Toulouse (UT)-Observatoire Midi-Pyrénées (OMP), Institut de Recherche pour le Développement (IRD)-Université Toulouse III - Paul Sabatier (UT3), Université de Toulouse (UT)-Université de Toulouse (UT)-Institut national des sciences de l'Univers (INSU - CNRS)-Centre National d'Études Spatiales [Toulouse] (CNES)-Centre National de la Recherche Scientifique (CNRS)-Météo-France -Institut de Recherche pour le Développement (IRD)-Institut national des sciences de l'Univers (INSU - CNRS)-Centre National d'Études Spatiales [Toulouse] (CNES)-Centre National de la Recherche Scientifique (CNRS)-Météo-France -Centre National de la Recherche Scientifique (CNRS)-Institut National Polytechnique (Toulouse) (Toulouse INP), Université de Toulouse (UT), Institut de Recherche pour le Développement (IRD)-Institut national des sciences de l'Univers (INSU - CNRS)-Université de Montpellier (UM)-Centre National de la Recherche Scientifique (CNRS), Institut de Mécanique et d'Ingénierie (I2M), Université de Bordeaux (UB)-Institut Polytechnique de Bordeaux-Centre National de la Recherche Scientifique (CNRS)-Institut National de Recherche pour l’Agriculture, l’Alimentation et l’Environnement (INRAE)-Arts et Métiers Sciences et Technologies, and HESAM Université - Communauté d'universités et d'établissements Hautes écoles Sorbonne Arts et métiers université (HESAM)-HESAM Université - Communauté d'universités et d'établissements Hautes écoles Sorbonne Arts et métiers université (HESAM)
Subjects: Pollution, 010504 meteorology & atmospheric sciences, Carbonate, media_common.quotation_subject, Weathering, [SDE.MCG]Environmental Sciences/Global Changes, PCO2, Karst, Acid Rain, [SDV.SA.SDS]Life Sciences [q-bio]/Agricultural sciences/Soil study, 010502 geochemistry & geophysics, 01 natural sciences, Océan, Atmosphère, chemistry.chemical_compound, [SDV.EE.ECO]Life Sciences [q-bio]/Ecology, environment/Ecosystems, Geochemistry and Petrology, [SDU.STU.GC]Sciences of the Universe [physics]/Earth Sciences/Geochemistry, pCO2, [SDU.STU.HY]Sciences of the Universe [physics]/Earth Sciences/Hydrology, [SDU.ENVI]Sciences of the Universe [physics]/Continental interfaces, environment, Dissolution, ComputingMilieux_MISCELLANEOUS, 0105 earth and related environmental sciences, media_common, Carbonic acid, [SDE.IE]Environmental Sciences/Environmental Engineering, Global warming, Acid Rain:Global warming Karst, 6. Clean water, chemistry, Carbon dioxide, 13. Climate action, Environmental chemistry, Environmental science, Acid rain, [SDV.TOX.ECO]Life Sciences [q-bio]/Toxicology/Ecotoxicology, [SDE.BE]Environmental Sciences/Biodiversity and Ecology, Surface water
Abstract: International audience; The long-term change in surface water chemistry over time in remote areas is usually related to global change, including several processes such as global warming and acid atmospheric pollution. These cumulative factors limit the quantitative interpretation of the global warming effect on surface water acidification in relation to the atmospheric CO2 sink. To quantitatively estimate the impact of global warming on the atmospheric/soil CO2 uptake by carbonate weathering, the approach proposed here involves discriminating the proportion of [Ca + Mg] in waters resulting from soil carbonic acid dissolution (equal to the amount of CO2 uptake from soil/atmosphere) from the proportion resulting from strong acid pollution. This approach was applied to 5 karst hydrosystems located in France, far from local pollution sources and with several decades of hydrochemical monitoring.[Ca + Mg] from acid deposition represented between 16 and 25% of the total [Ca + Mg] concentration and the flux was positively correlated with the atmospheric deposition flux. This [Ca + Mg] increase is associated with increasing [Mg] and was found to be driven by the acid pollution inputs. Equilibrating water with calcite in presence of carbonic acid will release [Ca + Mg] into solution. The input of strong acids from atmospheric pollution contributes more to magnesian calcite dissolution because its solubility is lower than that of calcite.Since the 1980s, the decrease in [Ca + Mg] production due to the decrease in acid atmospheric deposition has minimized the increase in [Ca + Mg] linked to CO2 partial pressure (pCO2) increasing with global warming. It was found that [Ca + Mg] from H2CO3 dissolution did not decrease with an increase in air temperature, as suggested by carbonate solubility. The annual fluxes of Ca + Mg from H2CO3 dissolution, calculated for an average flow, showed a positive gradient with air temperature, of about 0.061 mol m2 yr−1 °C−1 (±0.006). In low rainfall areas, the pCO2 increase with air temperature was stronger than in rainy areas. For an average specific discharge of 300 L m−2 yr−1, global warming is estimated to increase the CO2 uptake flux by about 204 micromol L−1 °C−1 (5.7% of the observed flux).
Published: 2020
Full Text: View/download PDF

4. Stabilizing the Structure of LiCoPO4 Nanocrystals via Addition of Fe3+: Formation of Fe3+ Surface Layer, Creation of Diffusion-Enhancing Vacancies, and Enabling High-Voltage Battery Operation: Formation of Fe 3+ Surface Layer, Creation of Diffusion-Enhancing Vacancies, and Enabling High-Voltage Battery Operation

Author: Wako Naoi, Yiyo Lim, Katsuhiko Naoi, Patrice Simon, Naohisa Okita, Etsuro Iwama, Yusuke Takami, Yuki Sakai, Thierry Brousse, Kazuaki Kisu, Moulay Tahar Sougrati, Patrick Rozier, Centre National de la Recherche Scientifique - CNRS (FRANCE), Collège de France (FRANCE), Ecole Nationale Supérieure de Chimie de Paris - ENSCP (FRANCE), Ecole Nationale Supérieure de Chimie de Montpellier - ENSCM (FRANCE), Institut National Polytechnique de Toulouse - Toulouse INP (FRANCE), Institut polytechnique de Grenoble (FRANCE), National Tsing Hua University - NTHU (TAIWAN), Sorbonne Université (FRANCE), Tokyo University of Agriculture and Technology - TUAT (JAPAN), Tokyo University of the Arts - TUA (JAPAN), Université Toulouse III - Paul Sabatier - UT3 (FRANCE), Université de Nantes (FRANCE), Université de Picardie Jules Verne (FRANCE), Université de Montpellier 1 (FRANCE), Université de Montpellier 2 (FRANCE), Université de Pau et des Pays de l'Adour - UPPA (FRANCE), Université de Montpellier (FRANCE), Réseau sur le Stockage Electrochimique de l'Energie - RS2E (Amiens, France), Tokyo University of Agriculture and Technology (TUAT), Réseau sur le stockage électrochimique de l'énergie (RS2E), Université de Nantes (UN)-Aix Marseille Université (AMU)-Université de Haute-Alsace (UHA) Mulhouse - Colmar (Université de Haute-Alsace (UHA))-Collège de France (CdF (institution))-Université de Picardie Jules Verne (UPJV)-Ecole Nationale Supérieure de Chimie de Montpellier (ENSCM)-Ecole Nationale Supérieure de Chimie de Paris - Chimie ParisTech-PSL (ENSCP), Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL)-Université de Pau et des Pays de l'Adour (UPPA)-Institut de Chimie du CNRS (INC)-Université de Montpellier (UM)-Sorbonne Université (SU)-Centre National de la Recherche Scientifique (CNRS)-Institut National Polytechnique (Toulouse) (Toulouse INP), Université de Toulouse (UT)-Université de Toulouse (UT)-Institut polytechnique de Grenoble - Grenoble Institute of Technology (Grenoble INP ), Université Grenoble Alpes (UGA)-Université Grenoble Alpes (UGA), Institut Charles Gerhardt Montpellier - Institut de Chimie Moléculaire et des Matériaux de Montpellier (ICGM), Ecole Nationale Supérieure de Chimie de Montpellier (ENSCM)-Institut de Chimie du CNRS (INC)-Université de Montpellier (UM)-Centre National de la Recherche Scientifique (CNRS), Institut des Matériaux Jean Rouxel (IMN), Université de Nantes - UFR des Sciences et des Techniques (UN UFR ST), Université de Nantes (UN)-Université de Nantes (UN)-Ecole Polytechnique de l'Université de Nantes (EPUN), Université de Nantes (UN)-Université de Nantes (UN)-Institut de Chimie du CNRS (INC)-Centre National de la Recherche Scientifique (CNRS), Centre d'élaboration de matériaux et d'études structurales (CEMES), Institut National des Sciences Appliquées - Toulouse (INSA Toulouse), Institut National des Sciences Appliquées (INSA)-Université de Toulouse (UT)-Institut National des Sciences Appliquées (INSA)-Université de Toulouse (UT)-Institut de Chimie de Toulouse (ICT), Institut de Recherche pour le Développement (IRD)-Université Toulouse III - Paul Sabatier (UT3), Université de Toulouse (UT)-Université de Toulouse (UT)-Institut de Chimie du CNRS (INC)-Centre National de la Recherche Scientifique (CNRS)-Institut National Polytechnique (Toulouse) (Toulouse INP), Université de Toulouse (UT)-Institut de Recherche pour le Développement (IRD)-Université Toulouse III - Paul Sabatier (UT3), Université de Toulouse (UT)-Institut de Chimie du CNRS (INC)-Centre National de la Recherche Scientifique (CNRS)-Institut National Polytechnique (Toulouse) (Toulouse INP), Université de Toulouse (UT)-Centre National de la Recherche Scientifique (CNRS), Centre interuniversitaire de recherche et d'ingenierie des matériaux (CIRIMAT), Université Toulouse III - Paul Sabatier (UT3), Université de Toulouse (UT), and Institut National Polytechnique de Toulouse - INPT (FRANCE)
Subjects: Energie électrique, Materials science, General Chemical Engineering, Electron energy loss spectroscopy, Matériaux, [SPI.NRJ]Engineering Sciences [physics]/Electric power, Nanoparticle, 02 engineering and technology, General Chemistry, Electrolyte, 010402 general chemistry, 021001 nanoscience & nanotechnology, Electrochemistry, 01 natural sciences, Redox, 0104 chemical sciences, [SPI.MAT]Engineering Sciences [physics]/Materials, Chemical engineering, X-ray photoelectron spectroscopy, Electrode, Materials Chemistry, [PHYS.COND.CM-MS]Physics [physics]/Condensed Matter [cond-mat]/Materials Science [cond-mat.mtrl-sci], Surface layer, 0210 nano-technology
Abstract: Note : This article was published ASAP on September 21, 2018, with errors in Figures 1 and 3−5, Table 1, and in the Supporting Information. The corrected version was reposted on September 27, 2018.; International audience; Factors affecting the cyclability of the Fe-substituted LiCoPO4 (LiCo0.8Fe0.2PO4, LCFP) material were elucidated, including both the structural and electrode/electrolyte stability. Electrochemical characterization of the synthesized LCFP nanoparticles lends clear evidence for improved electrochemical stability of LCP, as well as enhanced rate capability, with Fe3+ substitution. Surface analysis using X-ray photoelectron spectroscopy (XPS) and electron energy loss spectroscopy (EELS) suggest that Fe enrichment on the surface of LCFP occurs through the oxidation of Fe2+ into Fe3+ in the synthesis process. The Fe3+-rich phase on the LCP surface enhances the stability of the delithiated phase, preventing oxidative reactions with electrolytes during high-voltage operation. This surface protection persists as long as the electrochemical reduction of Fe3+ is avoided by ensuring that the full range of operating voltages lie above the Fe3+/Fe2+ redox potential. Our findings may offer new approaches to stabilize the structure of LCP and other high-voltage positive electrodes for use in 5 V-class Li-ion batteries.
Published: 2018
Full Text: View/download PDF

5. Consequences of biodiversity loss for litter decomposition across biomes

Author: Bernhard Schmid, Edwin T. H. M. Peeters, Brendan G. McKie, Stefan Scheu, Rien Aerts, Marika Makkonen, Veronique C. A. Vos, I. Tanya Handa, Jasper van Ruijven, Matty P. Berg, Mark O. Gessner, Eric Chauvet, Björn Malmqvist, Frank Berendse, Olaf Butenschoen, Andreas Bruder, Jérémy Jabiol, Stephan Hättenschwiler, University of Zurich, Hättenschwiler, Stephan, Centre d’Ecologie Fonctionnelle et Evolutive (CEFE), Centre National de la Recherche Scientifique (CNRS)-Université de Montpellier (UM)-École pratique des hautes études (EPHE), Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL)-Centre international d'études supérieures en sciences agronomiques (Montpellier SupAgro)-Institut National de la Recherche Agronomique (INRA)-Université Paul-Valéry - Montpellier 3 (UPVM)-Institut national d’études supérieures agronomiques de Montpellier (Montpellier SupAgro), Institut national d'enseignement supérieur pour l'agriculture, l'alimentation et l'environnement (Institut Agro)-Institut national d'enseignement supérieur pour l'agriculture, l'alimentation et l'environnement (Institut Agro)-Institut de Recherche pour le Développement (IRD [France-Sud]), Département des Sciences Biologiques, Université du Québec à Montréal = University of Québec in Montréal (UQAM), VU University Amsterdam, Nature Conservation and Plant Ecology Group, Wageningen University and Research [Wageningen] (WUR), Department of Aquatic Ecology, Swiss Federal institute of aquatic science and technology-IBZ, Institute of Integrative Biology IBZ, J. F. Blumenbach Institute of Zoology and Anthropology, Georg-August-University [Göttingen], Laboratoire Ecologie Fonctionnelle et Environnement (ECOLAB), Institut Ecologie et Environnement (INEE), Centre National de la Recherche Scientifique (CNRS)-Centre National de la Recherche Scientifique (CNRS)-Université Toulouse III - Paul Sabatier (UT3), Université Fédérale Toulouse Midi-Pyrénées-Université Fédérale Toulouse Midi-Pyrénées-Observatoire Midi-Pyrénées (OMP), Météo France-Centre National d'Études Spatiales [Toulouse] (CNES)-Université Fédérale Toulouse Midi-Pyrénées-Centre National de la Recherche Scientifique (CNRS)-Institut de Recherche pour le Développement (IRD)-Météo France-Centre National d'Études Spatiales [Toulouse] (CNES)-Centre National de la Recherche Scientifique (CNRS)-Institut de Recherche pour le Développement (IRD)-Centre National de la Recherche Scientifique (CNRS)-Institut National Polytechnique (Toulouse) (Toulouse INP), Université Fédérale Toulouse Midi-Pyrénées, Leibniz Institute of Freshwater Ecology and Inland Fisheries (IGB), Berlin Institute of Technology, Finnish Environment Institute (SYKE), Department of Ecology and Environmental Science [Umeå], Umeå University, Department of Aquatic Sciences and Assessment, Swedish University of Agricultural Sciences (SLU), Wageningen University and Research Centre (WUR), Universität Zürich [Zürich] = University of Zurich (UZH), European Science Foundation (ESF) as part of the EUROCORES programme EuroDIVERSITY (BioCycle research project), Centre de Coopération Internationale en Recherche Agronomique - CIRAD (FRANCE), Centre National de la Recherche Scientifique - CNRS (FRANCE), Leibniz-Institut für Gewässerökologie und Binnenfischerei - IGB (GERMANY), Institut National Polytechnique de Toulouse - INPT (FRANCE), Institut National de la Recherche Agronomique - INRA (FRANCE), Institut de Recherche pour le Développement - IRD (FRANCE), Montpellier SupAgro (FRANCE), Finnish Environment Institute - SYKE (FINLAND), Technische Universität Berlin - TU Berlin (GERMANY), Umea University (SWEDEN), Université Toulouse III - Paul Sabatier - UT3 (FRANCE), Université de Montpellier 1 (FRANCE), Université de Montpellier 2 (FRANCE), Université du Québec à Montréal - UQAM (CANADA), Wageningen University & Research - WUR (NETHERLANDS), Swiss Federal Institute of Aquatic Science and Technology - EAWAG (SWITZERLAND), Ecole Pratique des Hautes Etudes - EPHE (FRANCE), Georg-August-Universität Göttingen (GERMANY), Sveriges lantbruksuniversitet - SLU (SWEDEN), Eidgenössische Technische Hochschule Zürich - ETHZ (SWITZERLAND), Université de Montpellier 3 (FRANCE), Vrije University Amsterdam - VU (NETHERLANDS), Universität Zürich - UZH (SWITZERLAND), Vrije universiteit = Free university of Amsterdam [Amsterdam] (VU), Université Toulouse III - Paul Sabatier (UT3), Université Fédérale Toulouse Midi-Pyrénées-Université Fédérale Toulouse Midi-Pyrénées-Institut Ecologie et Environnement (INEE), Centre National de la Recherche Scientifique (CNRS)-Centre National de la Recherche Scientifique (CNRS)-Institut National Polytechnique (Toulouse) (Toulouse INP), Université Fédérale Toulouse Midi-Pyrénées-Observatoire Midi-Pyrénées (OMP), Météo France-Centre National d'Études Spatiales [Toulouse] (CNES)-Université Fédérale Toulouse Midi-Pyrénées-Centre National de la Recherche Scientifique (CNRS)-Institut de Recherche pour le Développement (IRD)-Météo France-Centre National d'Études Spatiales [Toulouse] (CNES)-Centre National de la Recherche Scientifique (CNRS)-Institut de Recherche pour le Développement (IRD)-Centre National de la Recherche Scientifique (CNRS), Institut National Polytechnique de Toulouse - Toulouse INP (FRANCE), Systems Ecology, Animal Ecology, and Amsterdam Global Change Institute
Subjects: Nutrient cycle, Aquatic Ecology and Water Quality Management, services, species functional diversity, leaf-litter, Nitrogen, Biodiversité et Ecologie, Biodiversity, ta1171, Plant Ecology and Nature Conservation, Biology, Decomposer, Carbon Cycle, 10127 Institute of Evolutionary Biology and Environmental Studies, traits, Litter, Ecosystem, patterns, 14. Life underwater, Nitrogen cycle, climate, Ecologie, Environnement, Tropical Climate, 1000 Multidisciplinary, Multidisciplinary, WIMEK, Arctic Regions, Ecology, Aquatic ecosystem, Nitrogen Cycle, Plants, 15. Life on land, Plant litter, Aquatische Ecologie en Waterkwaliteitsbeheer, PE&RC, Carbon, 13. Climate action, Biodiversity loss, Plantenecologie en Natuurbeheer, 570 Life sciences, biology, 590 Animals (Zoology), [SDE.BE]Environmental Sciences/Biodiversity and Ecology, ecosystems
Abstract: The decomposition of dead organic matter is a major determinant of carbon and nutrient cycling in ecosystems, and of carbon fluxes between the biosphere and the atmosphere1, 2, 3. Decomposition is driven by a vast diversity of organisms that are structured in complex food webs2, 4. Identifying the mechanisms underlying the effects of biodiversity on decomposition is critical4, 5, 6 given the rapid loss of species worldwide and the effects of this loss on human well-being7, 8, 9. Yet despite comprehensive syntheses of studies on how biodiversity affects litter decomposition4, 5, 6, 10, key questions remain, including when, where and how biodiversity has a role and whether general patterns and mechanisms occur across ecosystems and different functional types of organism4, 9, 10, 11, 12. Here, in field experiments across five terrestrial and aquatic locations, ranging from the subarctic to the tropics, we show that reducing the functional diversity of decomposer organisms and plant litter types slowed the cycling of litter carbon and nitrogen. Moreover, we found evidence of nitrogen transfer from the litter of nitrogen-fixing plants to that of rapidly decomposing plants, but not between other plant functional types, highlighting that specific interactions in litter mixtures control carbon and nitrogen cycling during decomposition. The emergence of this general mechanism and the coherence of patterns across contrasting terrestrial and aquatic ecosystems suggest that biodiversity loss has consistent consequences for litter decomposition and the cycling of major elements on broad spatial scales.
Published: 2014
Full Text: View/download PDF

6. Accounting for convective effects in zero-Mach-number thermoacoustic models

Author: Emmanuel Motheau, Franck Nicoud, Laurent Selle, Centre Européen de Recherche et de Formation Avancée en Calcul Scientifique (CERFACS), CERFACS, Institut de mécanique des fluides de Toulouse (IMFT), Université Toulouse III - Paul Sabatier (UT3), Université Fédérale Toulouse Midi-Pyrénées-Université Fédérale Toulouse Midi-Pyrénées-Centre National de la Recherche Scientifique (CNRS)-Institut National Polytechnique (Toulouse) (Toulouse INP), Université Fédérale Toulouse Midi-Pyrénées, Institut de Mathématiques et de Modélisation de Montpellier (I3M), Centre National de la Recherche Scientifique (CNRS)-Université Montpellier 2 - Sciences et Techniques (UM2)-Université de Montpellier (UM), Centre National de la Recherche Scientifique - CNRS (FRANCE), Institut National Polytechnique de Toulouse - INPT (FRANCE), Université Toulouse III - Paul Sabatier - UT3 (FRANCE), Université de Montpellier 2 (FRANCE), and Institut National Polytechnique de Toulouse - Toulouse INP (FRANCE)
Subjects: Convection, Mean-flow effects, Acoustics and Ultrasonics, Helmholtz equation, Mécanique des fluides, 020209 energy, 02 engineering and technology, 01 natural sciences, [SPI.MECA.MEFL]Engineering Sciences [physics]/Mechanics [physics.med-ph]/Fluids mechanics [physics.class-ph], 010305 fluids & plasmas, symbols.namesake, 0103 physical sciences, 0202 electrical engineering, electronic engineering, information engineering, Entropy (information theory), Mean flow, [PHYS.MECA.MEFL]Physics [physics]/Mechanics [physics]/Fluid mechanics [physics.class-ph], Statistical physics, Boundary value problem, Sound pressure, Combustion instabilities, Mathematics, Mechanical Engineering, Mechanics, Condensed Matter Physics, Thermoacoustics, Mach number, Mechanics of Materials, symbols, Acoustic impedance
Abstract: International audience; This paper presents a methodology to account for some mean-flow effects on thermo-acoustic instabilities when using the zero-Mach-number assumption. It is shown that when a computational domain is represented under the M=0 assumption, a nonzero-Mach-number element can simply be taken into account by imposing a proper acoustic impedance at the boundaries so as to mimic the mean flow effects in the outer, not computed flow domain. A model that accounts for the coupling between acoustic and entropy waves is presented. It relies on a "delayed entropy coupled boundary condition" (DECBC) for the Helmholtz equation satisfied by the acoustic pressure. The model proves able to capture low-frequency entropic modes even without mean-flow terms in the fluctuating pressure equation.
Published: 2014
Full Text: View/download PDF

7. Amino-Modified Hydrogen-Bonding Resin and its Adsorption on Berberine

Author: Marie-Hélène Manero, Yong Hui Song, Yongping Shan, Anne Galarneau, Yu Ting Gu, Ping Zeng, Centre National de la Recherche Scientifique - CNRS (FRANCE), Chinese Research Academy of Environmental Sciences - CRAES (CHINA), Ecole Nationale Supérieure de Chimie de Montpellier - ENSCM (FRANCE), Institut National Polytechnique de Toulouse - INPT (FRANCE), Université Toulouse III - Paul Sabatier - UT3 (FRANCE), Université de Montpellier 1 (FRANCE), Université de Montpellier 2 (FRANCE), Shandong University - SDU (CHINA), Université de Montpellier (FRANCE), Institut Charles Gerhardt - ICG (Montpellier, France), Chinese Research Academy of Environmental Sciences, Shandong University of Science and Technology, Institut Charles Gerhardt Montpellier - Institut de Chimie Moléculaire et des Matériaux de Montpellier (ICGM ICMMM), Ecole Nationale Supérieure de Chimie de Montpellier (ENSCM)-Centre National de la Recherche Scientifique (CNRS)-Université de Montpellier (UM)-Université Montpellier 1 (UM1)-Université Montpellier 2 - Sciences et Techniques (UM2)-Institut de Chimie du CNRS (INC), Laboratoire de génie chimique [ancien site de Basso-Cambo] (LGC), Université Toulouse III - Paul Sabatier (UT3), Université Fédérale Toulouse Midi-Pyrénées-Université Fédérale Toulouse Midi-Pyrénées-Centre National de la Recherche Scientifique (CNRS)-Institut National Polytechnique (Toulouse) (Toulouse INP), Université Fédérale Toulouse Midi-Pyrénées, and Institut National Polytechnique de Toulouse - Toulouse INP (FRANCE)
Subjects: Berberine, 0207 environmental engineering, Electron donor, 02 engineering and technology, 010501 environmental sciences, 01 natural sciences, chemistry.chemical_compound, Adsorption, stomatognathic system, Polymer chemistry, Génie chimique, Molecule, Génie des procédés, 020701 environmental engineering, Resin, 0105 earth and related environmental sciences, chemistry.chemical_classification, [SDE.IE]Environmental Sciences/Environmental Engineering, Hydrogen-Bond, Hydrogen bond, technology, industry, and agriculture, Adsorption effect, General Medicine, Electron acceptor, chemistry, [CHIM.OTHE]Chemical Sciences/Other
Abstract: International audience; A hydrogen-bond donor resin HX was obtained by modifying resin H103 . The adsorption effect of resin HX on berberine was determined. The adsorbing kinetic and dynamic mechanisms of resin HX and resin H103 was compared. The results showed that, after modification, resin HX could form hydrogen-bond with berberine molecules. In the adsorption process, two C-O groups on berberine molecules became the electron acceptor of hydrogen-bond and the N-H group on resin molecules became the electron donor of hydrogen-bond. The existence of hydrogen-bond enhanced the adsorption force, and led to bigger amount of adsorption.
Published: 2013
Full Text: View/download PDF

8. Electrochemical reduction of CO2 catalysed by Geobacter sulfurreducens grown on polarized stainless steel cathodes

Author: Marie-Line Délia, Alain Bergel, Benjamin Erable, Laurence Soussan, Julien Riess, Centre National de la Recherche Scientifique - CNRS (FRANCE), Ecole Nationale Supérieure de Chimie de Montpellier - ENSCM (FRANCE), Institut National Polytechnique de Toulouse - INPT (FRANCE), Université Toulouse III - Paul Sabatier - UT3 (FRANCE), Université de Montpellier 2 (FRANCE), Institut Européen des membranes (IEM), Centre National de la Recherche Scientifique (CNRS)-Ecole Nationale Supérieure de Chimie de Montpellier (ENSCM)-Université Montpellier 2 - Sciences et Techniques (UM2)-Institut de Chimie du CNRS (INC)-Université de Montpellier (UM), Laboratoire de génie chimique [ancien site de Basso-Cambo] (LGC), Université Toulouse III - Paul Sabatier (UT3), Université Fédérale Toulouse Midi-Pyrénées-Université Fédérale Toulouse Midi-Pyrénées-Centre National de la Recherche Scientifique (CNRS)-Institut National Polytechnique (Toulouse) (Toulouse INP), Université Fédérale Toulouse Midi-Pyrénées, and Institut National Polytechnique de Toulouse - Toulouse INP (FRANCE)
Subjects: [SDV.BIO]Life Sciences [q-bio]/Biotechnology, Matériaux, Biochimie, Inorganic chemistry, Biotechnologies, 02 engineering and technology, [CHIM.INOR]Chemical Sciences/Inorganic chemistry, Chimie inorganique, 010402 general chemistry, Electrochemistry, 01 natural sciences, law.invention, lcsh:Chemistry, Reduction (complexity), Stress (mechanics), chemistry.chemical_compound, law, Glycerol, [SDV.BBM.BC]Life Sciences [q-bio]/Biochemistry, Molecular Biology/Biochemistry [q-bio.BM], [INFO.INFO-BT]Computer Science [cs]/Biotechnology, Geobacter sulfurreducens, chemistry.chemical_classification, biology, Chemistry, [CHIM.MATE]Chemical Sciences/Material chemistry, Microbial electrocatalysis, Electron acceptor, 021001 nanoscience & nanotechnology, biology.organism_classification, 6. Clean water, Cathode, Polymères, 0104 chemical sciences, [CHIM.POLY]Chemical Sciences/Polymers, lcsh:Industrial electrochemistry, lcsh:QD1-999, CO2 reduction, 13. Climate action, Carbon dioxide, 0210 nano-technology, Biocathode, lcsh:TP250-261
Abstract: Polarized stainless steel cathodes in pure cultures of Geobacter sulfurreducens generated reduction currents of up to 30 A/m2 even when the sole electron acceptor contained in solution was completely reduced. It was shown here that these currents were driven by the carbon dioxide that was provided to the solution. It was postulated that CO2 reduction consumed succinate and produced glycerol, which remained stored inside the cells and was released under the effect of stress. Keywords: Biocathode, Geobacter sulfurreducens, CO2 reduction, Microbial electrocatalysis
Published: 2013
Full Text: View/download PDF

9. Development of a new family of monolithic calcium (pyro)phosphate glasses by soft chemistry

Author: Christian Rey, Jérémy Soulié, Danielle Laurencin, Pierre Gras, Christèle Combes, Olivier Marsan, Centre National de la Recherche Scientifique - CNRS (FRANCE), Ecole Nationale Supérieure de Chimie de Montpellier - ENSCM (FRANCE), Institut National Polytechnique de Toulouse - Toulouse INP (FRANCE), Université Toulouse III - Paul Sabatier - UT3 (FRANCE), Université de Montpellier 1 (FRANCE), Université de Montpellier 2 (FRANCE), Université de Montpellier (FRANCE), Centre interuniversitaire de recherche et d'ingenierie des matériaux (CIRIMAT), Centre National de la Recherche Scientifique (CNRS)-Université Toulouse III - Paul Sabatier (UT3), Université Fédérale Toulouse Midi-Pyrénées-Université Fédérale Toulouse Midi-Pyrénées-Institut National Polytechnique (Toulouse) (Toulouse INP), Université Fédérale Toulouse Midi-Pyrénées-Institut de Chimie du CNRS (INC), Institut Charles Gerhardt Montpellier - Institut de Chimie Moléculaire et des Matériaux de Montpellier (ICGM ICMMM), Ecole Nationale Supérieure de Chimie de Montpellier (ENSCM)-Centre National de la Recherche Scientifique (CNRS)-Université de Montpellier (UM)-Université Montpellier 1 (UM1)-Université Montpellier 2 - Sciences et Techniques (UM2)-Institut de Chimie du CNRS (INC), ANR, ANR-12-BS08-0022,CAPYROSIS,Formation de cristaux de pyrophosphates de calcium et arthrose : études in vitro et in vivo(2012), and Institut National Polytechnique de Toulouse - INPT (FRANCE)
Subjects: Pyrophosphate, Materials science, Differential Thermal Analysis, Static Electricity, Chimie analytique, Biomedical Engineering, Mineralogy, 02 engineering and technology, 010402 general chemistry, Calcium Pyrophosphate, 01 natural sciences, Biochemistry, Science des matériaux, Soft chemistry, law.invention, Biomaterials, chemistry.chemical_compound, law, sol-gel, Crystallization, Molecular Biology, biomaterial, (Pyro) phosphate glasses, General Medicine, [CHIM.MATE]Chemical Sciences/Material chemistry, Hydrogen-Ion Concentration, 021001 nanoscience & nanotechnology, Phosphate, Chemistry, Inorganic, 0104 chemical sciences, Amorphous solid, Solutions, chemistry, Chemical engineering, Ionic strength, Thermogravimetry, Microscopy, Electron, Scanning, Hydroxide, Glass, 0210 nano-technology, Hybrid material, Monolith, Biotechnology
Abstract: The development of bioactive phosphate-based glasses is essential in biomaterials science, and especially for bone substitution applications. In this context, the preparation of amorphous calcium-phosphorus hydroxide/oxide monoliths at low temperature is a key challenge for being able to develop novel hybrid materials for these applications. We herein report for the first time the synthesis and physical chemical characterisation of a novel family of pyrophosphate-based glasses (with the formula: {[(Ca(2+))1-x(H(+)/K(+))2x]2[(P2O7(4-))1-y(PO4(3-))4y/3]} n(H2O)), which were prepared by soft chemistry using low temperatures (T70°C) and water as a solvent. The effect of the initial Ca/Pyrophosphate ratio on the structure and morphology of these pyrophosphate glasses was investigated in detail. Depending on this ratio, a glass (mixed calcium pyro- and orthophosphate) or a glass-ceramic (Ca10K4(P2O7)6·9H2O crystals embedded in the amorphous phase) was obtained. The proportion of the crystalline phase increased with an increase in the Ca/Pyrophosphate ratio in the batch solution. As expected for a glass, the formation of the glassy material was demonstrated not to be thermodynamically but rather kinetically driven, and the washing step was found to be crucial to prevent crystallisation. The stability of the amorphous phase was discussed considering the structural degrees of freedom of pyrophosphate entities, ionic strength of the initial solution and the inhibitory effect of orthophosphate ions. Overall, this new strategy of preparation of monolithic calcium-(pyro)phosphate based glasses using soft chemistry in water is highly promising in view of preparing new functional organic-inorganic hybrids for bone substitution applications.Phosphate-based glasses have gradually emerged as a potential alternative to silicate bioactive glasses in order to induce different biological mechanisms of degradation. The synthesis of such monolithic glasses at low temperature is a key step to allow new inorganic glass compositions to be reached and hybrid materials to be prepared. Although sol-gel and coacervate methods (respectively orthophosphate and metaphosphate precursors) have already been described to prepare such glasses, the use of toxic solvents and/or the final temperature treatment associated to these processes could limit the use of these materials for biomedical applications and/or the further development of hybrids. It is shown here that pyrophosphate precursors are an alternative strategy to obtain monolithic calcium (pyro)phosphate glasses under soft conditions (water solvent, 70°C).
Published: 2016
Full Text: View/download PDF

10. Correcting the radar rainfall forcing of a hydrological model with data assimilation: application to flood forecasting in the Lez catchment in Southern France

Author: Sophie Ricci, Christophe Bouvier, Valérie Borrell-Estupina, Andrea Piacentini, Elizabeth Harader, Olivier Thual, Mathieu Coustau, Centre Européen de Recherche et de Formation Avancée en Calcul Scientifique (CERFACS), Hydrosciences Montpellier (HSM), Institut de Recherche pour le Développement (IRD)-Université Montpellier 2 - Sciences et Techniques (UM2)-Institut national des sciences de l'Univers (INSU - CNRS)-Centre National de la Recherche Scientifique (CNRS), Institut de mécanique des fluides de Toulouse (IMFT), Université Toulouse III - Paul Sabatier (UT3), Université de Toulouse (UT)-Université de Toulouse (UT)-Centre National de la Recherche Scientifique (CNRS)-Institut National Polytechnique (Toulouse) (Toulouse INP), Université de Toulouse (UT), Centre National de la Recherche Scientifique - CNRS (FRANCE), Institut National Polytechnique de Toulouse - Toulouse INP (FRANCE), Institut de Recherche pour le Développement - IRD (FRANCE), Université Toulouse III - Paul Sabatier - UT3 (FRANCE), Université de Montpellier 1 (FRANCE), and Université de Montpellier 2 (FRANCE)
Subjects: lcsh:GE1-350, Meteorology, Rain gauge, lcsh:T, Flood forecasting, lcsh:Geography. Anthropology. Recreation, [SDU.STU]Sciences of the Universe [physics]/Earth Sciences, Runoff curve number, lcsh:Technology, Sciences de la Terre, lcsh:TD1-1066, Runoff model, law.invention, Data assimilation, lcsh:G, Hyetograph, law, Flash flood, lcsh:Environmental technology. Sanitary engineering, Hydrology, Radar, lcsh:Environmental sciences
Abstract: International audience; The present study explores the application of a data assimilation (DA) procedure to correct the radar rain- fall inputs of an event-based, distributed, parsimonious hy- drological model. An extended Kalman filter algorithm was built on top of a rainfall-runoff model in order to assimilate discharge observations at the catchment outlet. This work fo- cuses primarily on the uncertainty in the rainfall data and considers this as the principal source of error in the sim- ulated discharges, neglecting simplifications in the hydro- logical model structure and poor knowledge of catchment physics. The study site is the 114 km2 Lez catchment near Montpellier, France. This catchment is subject to heavy oro- graphic rainfall and characterised by a karstic geology, lead- ing to flash flooding events. The hydrological model uses a derived version of the SCS method, combined with a Lag and Route transfer function. Because the radar rainfall in- put to the model depends on geographical features and cloud structures, it is particularly uncertain and results in signifi- cant errors in the simulated discharges. This study seeks to demonstrate that a simple DA algorithm is capable of ren- dering radar rainfall suitable for hydrological forecasting. To test this hypothesis, the DA analysis was applied to estimate a constant hyetograph correction to each of 19 flood events. The analysis was carried in two different modes: by assimi- lating observations at all available time steps, referred to here as reanalysis mode, and by using only observations up to 3 h before the flood peak to mimic an operational environment, referred to as pseudo-forecast mode. In reanalysis mode, the resulting correction of the radar rainfall data was then com- pared to the mean field bias (MFB), a corrective coefficient determined using rain gauge measurements. It was shown that the radar rainfall corrected using DA leads to improved discharge simulations and Nash-Sutcliffe efficiency criteria compared to the MFB correction. In pseudo-forecast mode, the reduction of the uncertainty in the rainfall data leads to a reduction of the error in the simulated discharge, but un- certainty from the model parameterisation diminishes data assimilation efficiency. While the DA algorithm used is this study is effective in correcting uncertain radar rainfall, model uncertainty remains an important challenge for flood fore- casting within the Lez catchment.
Published: 2012
Full Text: View/download PDF

11. The sol–gel route: A versatile process for up-scaling the fabrication of gas-tight thin electrolyte layers

Author: Florence Ansart, Anne Julbe, Céline Viazzi, Pascal Lenormand, Christian Guizard, Vincent Rouessac, Institut Européen des membranes (IEM), Centre National de la Recherche Scientifique (CNRS)-Ecole Nationale Supérieure de Chimie de Montpellier (ENSCM)-Université Montpellier 2 - Sciences et Techniques (UM2)-Institut de Chimie du CNRS (INC)-Université de Montpellier (UM), Centre National de la Recherche Scientifique - CNRS (FRANCE), Ecole Nationale Supérieure de Chimie de Montpellier - ENSCM (FRANCE), Institut National Polytechnique de Toulouse - Toulouse INP (FRANCE), Saint-Gobain (FRANCE), Université Toulouse III - Paul Sabatier - UT3 (FRANCE), Université de Montpellier 2 (FRANCE), and Institut National Polytechnique de Toulouse - INPT (FRANCE)
Subjects: INORGANIC MEMBRANES, Solid-state chemistry, Dip-coating, Materials science, Matériaux, Scale-up, Oxide, Energy Engineering and Power Technology, chemistry.chemical_element, Nanotechnology, 02 engineering and technology, Sol–gel, FILMS, 010402 general chemistry, 01 natural sciences, Suspension (chemistry), STABILIZED ZIRCONIA COATINGS, chemistry.chemical_compound, Spin-coating, Electrolyte, Electrical and Electronic Engineering, Physical and Theoretical Chemistry, OXIDE FUEL-CELLS, Sol-gel, Zirconium, Spin coating, Renewable Energy, Sustainability and the Environment, [SPI.PLASMA]Engineering Sciences [physics]/Plasmas, [CHIM.MATE]Chemical Sciences/Material chemistry, 021001 nanoscience & nanotechnology, 0104 chemical sciences, YSZ, chemistry, Chemical engineering, 0210 nano-technology, Wet chemistry
Abstract: Sol-gel routes are often investigated and adapted to prepare, by suitable chemical modifications, sub-micronic powders and derived materials with controlled morphology, which cannot be obtained by conventional solid state chemistry paths. Wet chemistry methods provide attractive alternative routes because mixing of species occurs at the atomic scale. In this paper, ultrafine powders were prepared by a novel synthesis method based on the sol-gel process and were dispersed into suspensions before processing. This paper presents new developments for the preparation of functional materials like yttria-stabilized-zirconia (YSZ, 8% Y2O3) used as electrolyte for solid oxide fuel cells. YSZ thick films were coated onto porous Ni-YSZ substrates using a suspension with an optimized formulation deposited by either a dip-coating or a spin-coating process. The suspension composition is based on YSZ particles encapsulated by a zirconium alkoxide which was added with an alkoxide derived colloidal sol. The in situ growth of these colloids increases significantly the layer density after an appropriated heat treatment. The derived films were continuous, homogeneous and around 20 mu M thick. The possible up-scaling of this process has been also considered and the suitable processing parameters were defined in order to obtain, at an industrial scale, homogeneous, crack-free, thick and adherent films after heat treatment at 1400 degrees C. (C) 2010 Elsevier B.V. All rights reserved.
Published: 2011
Full Text: View/download PDF

12. MnO2-coated Ni nanorods: Enhanced high rate behavior in pseudo-capacitive supercapacitor

Author: Frédéric Favier, Yannick Lei, Barbara Daffos, Patrice Simon, Pierre-Louis Taberna, Institut Charles Gerhardt Montpellier - Institut de Chimie Moléculaire et des Matériaux de Montpellier (ICGM ICMMM), Ecole Nationale Supérieure de Chimie de Montpellier (ENSCM)-Centre National de la Recherche Scientifique (CNRS)-Université de Montpellier (UM)-Université Montpellier 1 (UM1)-Université Montpellier 2 - Sciences et Techniques (UM2)-Institut de Chimie du CNRS (INC), Centre interuniversitaire de recherche et d'ingenierie des matériaux (CIRIMAT), Centre National de la Recherche Scientifique (CNRS)-Université Toulouse III - Paul Sabatier (UT3), Université Fédérale Toulouse Midi-Pyrénées-Université Fédérale Toulouse Midi-Pyrénées-Institut National Polytechnique (Toulouse) (Toulouse INP), Université Fédérale Toulouse Midi-Pyrénées-Institut de Chimie du CNRS (INC), Centre National de la Recherche Scientifique - CNRS (FRANCE), Ecole Nationale Supérieure de Chimie de Montpellier - ENSCM (FRANCE), Institut National Polytechnique de Toulouse - INPT (FRANCE), Université Toulouse III - Paul Sabatier - UT3 (FRANCE), Université de Montpellier 1 (FRANCE), Université de Montpellier 2 (FRANCE), and Institut National Polytechnique de Toulouse - Toulouse INP (FRANCE)
Subjects: Energie électrique, Materials science, Matériaux, General Chemical Engineering, High rate capacitance, Manganese dioxide, Mineralogy, 02 engineering and technology, Substrate (electronics), 010402 general chemistry, Electrochemistry, 01 natural sciences, 7. Clean energy, Coating, chemistry.chemical_compound, Supercapacitor, Anodizing, [CHIM.MATE]Chemical Sciences/Material chemistry, 021001 nanoscience & nanotechnology, 0104 chemical sciences, Dielectric spectroscopy, chemistry, Chemical engineering, Electrode, Aluminium oxide, Nanorods, Nanorod, 0210 nano-technology
Abstract: International audience; Ni nanorods prepared by electrochemical growth through an anodized aluminium oxide membrane were used as substrate for the electrodeposition of MnO2 either in potentiostatic mode or by a pulsed method. Electrochemical deposition parameters were chosen for an homogeneous deposit onto Ni nanorods. Resulting Ni supportedMnO2 electrodes were tested for electrochemical performances as nanostructured negative electrodes for supercapacitors. They exhibited initial capacitances up to 190 F/g and remarkable performances at high charge/discharge rates.
Published: 2010
Full Text: View/download PDF

13. High-Temperature Transport Properties of Yb4−x Sm x Sb3

Author: Audrey Chamoire, Claude Estournès, Franck Gascoin, Jean-Claude Tedenac, Thierry Caillat, Institut Charles Gerhardt Montpellier - Institut de Chimie Moléculaire et des Matériaux de Montpellier (ICGM ICMMM), Ecole Nationale Supérieure de Chimie de Montpellier (ENSCM)-Centre National de la Recherche Scientifique (CNRS)-Université de Montpellier (UM)-Université Montpellier 1 (UM1)-Université Montpellier 2 - Sciences et Techniques (UM2)-Institut de Chimie du CNRS (INC), Centre interuniversitaire de recherche et d'ingenierie des matériaux (CIRIMAT), Centre National de la Recherche Scientifique (CNRS)-Université Toulouse III - Paul Sabatier (UT3), Université Fédérale Toulouse Midi-Pyrénées-Université Fédérale Toulouse Midi-Pyrénées-Institut National Polytechnique (Toulouse) (Toulouse INP), Université Fédérale Toulouse Midi-Pyrénées-Institut de Chimie du CNRS (INC), ANR-06-JCJC-0090,THERMEL,Nouveaux Matériaux Thermoélectriques: antimoniures et tellurures du type structural Th3P4(2006), Centre National de la Recherche Scientifique - CNRS (FRANCE), Ecole Nationale Supérieure d'Ingénieurs de Caen - ENSICAEN (FRANCE), Institut National Polytechnique de Toulouse - INPT (FRANCE), National Aeronautics and Space Administration - NASA (USA), Ohio State University (USA), Université Toulouse III - Paul Sabatier - UT3 (FRANCE), Université de Caen Basse-Normandie (FRANCE), Université de Montpellier 2 (FRANCE), California Institute of Technology - Caltech (USA), and Institut National Polytechnique de Toulouse - Toulouse INP (FRANCE)
Subjects: Materials science, Solid-state physics, Matériaux, Analytical chemistry, chemistry.chemical_element, Spark plasma sintering, 02 engineering and technology, Crystal structure, 01 natural sciences, [SPI.MAT]Engineering Sciences [physics]/Materials, Optics, Seebeck coefficient, Yb4Sb3, 0103 physical sciences, Thermoelectric effect, Materials Chemistry, Anti-Th3P4, Electrical and Electronic Engineering, 010306 general physics, Thermoelectrics, business.industry, anti-Th3P4, 021001 nanoscience & nanotechnology, Condensed Matter Physics, Thermoelectric materials, 3. Good health, Electronic, Optical and Magnetic Materials, Cerium, chemistry, Crystallite, 0210 nano-technology, business, thermoelectrics, spark plasma sintering
Abstract: International audience; Polycrystalline L4Sb3 (L = La, Ce, Sm, and Yb) and Yb4-x Sm (x) Sb-3, which crystallizes in the anti-Th3P4 structure type (I-43d no. 220), were synthesized via high-temperature reaction. Structural and chemical characterization were performed by x-ray diffraction and electronic microscopy with energy-dispersive x-ray analysis. Pucks were densified by spark plasma sintering. Transport property measurements showed that these compounds are n-type with low Seebeck coefficients, except for Yb4Sb3, which shows semimetallic behavior with hole conduction above 523 K. By partially substituting Yb by a trivalent rare earth we successfully improved the thermoelectric figure of merit of Yb4Sb3 up to 0.7 at 1273 K.
Published: 2010
Full Text: View/download PDF

14. High-amylose sodium carboxymethyl starch matrices for oral, sustained drug release: development of a spray-drying manufacturing process

Author: Gilles Baylac, F. Brouillet, Bernard Bataille, Louis Cartilier, Centre de Coopération Internationale en Recherche Agronomique - CIRAD (FRANCE), Université de Montréal - UdeM (CANADA), Université de Montpellier 1 (FRANCE), and Université de Montpellier 2 (FRANCE)
Subjects: Materials science, Starch, Matériaux, Chemistry, Pharmaceutical, Drug Compounding, Spray-drying, Administration, Oral, Pharmaceutical Science, Excipient, Context (language use), Excipients, Tableting, chemistry.chemical_compound, Amylose, Drug Discovery, medicine, Technology, Pharmaceutical, Polymer, Pharmacology, chemistry.chemical_classification, Drug Carriers, Chromatography, Matrix, Organic Chemistry, Amorphous solid, chemistry, Chemical engineering, Delayed-Action Preparations, Spray drying, Drug delivery, Tablet, Sustained release, medicine.drug
Abstract: Context: High-amylose sodium carboxymethyl starch (HASCA) was recently proposed as a material for oral, sustained drug-release tablets prepared by direct compression. It was produced on a pilot scale, but appeared to be unsuitable for tableting and sustained drug release. Pilot-scale dry powder HASCA was dispersed in hot water and then precipitated with ethanol to give a dry powder presenting the required properties, but very high volumes of ethanol were used to recover the product. Objective: A process was therefore designed to transform totally amorphous pregelatinized HASCA by spray-drying into a suitable sustained drug-release excipient for matrix tablets while decreasing ethanol quantities. Results and discussion: During the first manufacturing step, that is, heating of the initial hydro-alcoholic suspension, powder and water concentrations are key parameters for the acquisition of excellent binding properties. Hence, a variable ratio of amylose Vh, a crystalline polymorph of amylose, to the amorphous form, is observed depending on the key parameter values. As the most crystalline samples give the weakest tablets, binding properties do not appear to be linked to the presence of a Vh form of amylose. On the other hand, a high water concentration results in excessive tablet strength, that is, inverse conditions leading to the appearance of a Vh form of amylose. Finally, variations in hydro-alcoholic composition appear to affect only tableting properties and do not influence the drug-release rate. Conclusion: A process designed to transform totally amorphous pregelatinized HASCA by spray-drying is proposed for easier, economical industrial HASCA production.
Published: 2010
Full Text: View/download PDF

15. High-temperature transport properties of complex antimonides with anti-Th3P4structure

Author: Jean-Claude Tedenac, Audrey Chamoire, Claude Estournès, Thierry Caillat, Franck Gascoin, Institut Charles Gerhardt Montpellier - Institut de Chimie Moléculaire et des Matériaux de Montpellier (ICGM ICMMM), Ecole Nationale Supérieure de Chimie de Montpellier (ENSCM)-Centre National de la Recherche Scientifique (CNRS)-Université de Montpellier (UM)-Université Montpellier 1 (UM1)-Université Montpellier 2 - Sciences et Techniques (UM2)-Institut de Chimie du CNRS (INC), Centre interuniversitaire de recherche et d'ingenierie des matériaux (CIRIMAT), Centre National de la Recherche Scientifique (CNRS)-Université Toulouse III - Paul Sabatier (UT3), Université Fédérale Toulouse Midi-Pyrénées-Université Fédérale Toulouse Midi-Pyrénées-Institut National Polytechnique (Toulouse) (Toulouse INP), Université Fédérale Toulouse Midi-Pyrénées-Institut de Chimie du CNRS (INC), Centre National de la Recherche Scientifique - CNRS (FRANCE), Institut National Polytechnique de Toulouse - INPT (FRANCE), National Aeronautics and Space Administration - NASA (USA), Université Toulouse III - Paul Sabatier - UT3 (FRANCE), Université de Montpellier 2 (FRANCE), California Institute of Technology - Caltech (USA), and Institut National Polytechnique de Toulouse - Toulouse INP (FRANCE)
Subjects: Diffraction, VALENCE FLUCTUATION, EFFICIENCY, Materials science, Matériaux, Rare earth, Analytical chemistry, Mineralogy, Spark plasma sintering, 02 engineering and technology, 01 natural sciences, Antimonides, law.invention, Inorganic Chemistry, Metal, PHASES, YB4SB3, law, Seebeck coefficient, 0103 physical sciences, YB4BI3, THERMOELECTRIC PROPERTIES, 010302 applied physics, [CHIM.MATE]Chemical Sciences/Material chemistry, 021001 nanoscience & nanotechnology, Thermal conduction, YB4AS3, visual_art, visual_art.visual_art_medium, Crystallite, YB14MN1-XALXSB11, Electron microscope, High-temperature transport, 0210 nano-technology, SYSTEM
Abstract: International audience; Polycrystalline samples of R4Sb3 (R = La, Ce, Smand Yb) and Yb4-xR'Sb-x(3)(R' = Sm and La) have been quantitatively synthesized by high-temperature reaction. They crystallize in the anti-Th3P4 structure type (I (4) over bar 3d, no. 220). Structural and chemical characterizations have been performed by X-ray diffraction and electron microscopy with energy dispersive X-ray analysis. Powders have been densified by spark plasma sintering (SPS) at 1300 degrees C under 50 MPa of pressure. Transport property measurements show that these compounds are n-type with low Seebeck coefficient except for Yb4Sb3 that shows a typical metallic behavior with hole conduction. By partially substituting Yb by a trivalent rare earth we successfully improved the thermoelectric figure of merit of Yb4-xR'Sb-x(3) up to 0.75 at 1000 degrees C.
Published: 2010
Full Text: View/download PDF

16. Periodic density functional study of Rh and Pd interaction with the (1 0 0)MgO surface

Author: Nino Russo, Corinne Lacaze-Dufaure, Emilia Sicilia, Valentin Alexiev, Claude Mijoule, Tzonka Mineva, Institut Charles Gerhardt Montpellier - Institut de Chimie Moléculaire et des Matériaux de Montpellier (ICGM ICMMM), Ecole Nationale Supérieure de Chimie de Montpellier (ENSCM)-Centre National de la Recherche Scientifique (CNRS)-Université de Montpellier (UM)-Université Montpellier 1 (UM1)-Université Montpellier 2 - Sciences et Techniques (UM2)-Institut de Chimie du CNRS (INC), Bulgarian Academy of Sciences (BULGARIA), Centre National de la Recherche Scientifique - CNRS (FRANCE), Ecole Nationale Supérieure de Chimie de Montpellier - ENSCM (FRANCE), Institut National Polytechnique de Toulouse - Toulouse INP (FRANCE), Université Toulouse III - Paul Sabatier - UT3 (FRANCE), Université de Montpellier 1 (FRANCE), Université de Montpellier 2 (FRANCE), and Università della Calabria (ITALY)
Subjects: Spin states, Matériaux, Rhodium and palladium adsorption, chemistry.chemical_element, 02 engineering and technology, Substrate (electronics), 01 natural sciences, Biochemistry, Rhodium, Metal, Condensed Matter::Materials Science, Adsorption, 0103 physical sciences, Atom, Physics::Atomic and Molecular Clusters, Physics::Chemical Physics, Physical and Theoretical Chemistry, 010306 general physics, ComputingMilieux_MISCELLANEOUS, Spin-polarized periodic calculations, Chemistry, 021001 nanoscience & nanotechnology, Condensed Matter Physics, [CHIM.THEO]Chemical Sciences/Theoretical and/or physical chemistry, Crystallography, Periodic density functional calculations, Covalent bond, (100)MgO surface, visual_art, visual_art.visual_art_medium, Geometrical and electronic properties, Atomic physics, 0210 nano-technology, Palladium
Abstract: The adsorption geometry and electronic properties of palladium and rhodium atoms deposited on the regular (1 0 0)MgO surface were analyzed by means of periodic DFT calculations using local, gradient-corrected and hybrid (B3LYP) functionals. Spin-polarized computations revealed doublet spin state of Rh atom to be the most stable electronic state for the adsorbed rhodium atom on (1 0 0)MgO. The preferred adsorption site of the metal (Pd and Rh) atoms was found to be the site on top of the surface oxygen atoms. A relatively stable geometry for the adsorption of the Pd and Rh in a bridge position above the two surface oxygens was found as well. The electronic structures suggested partly covalent bonding with contribution from electrostatic attraction between the metal and the oxygen atoms for both optimized structures. Small charge transfer was obtained from the support to the Pd and Rh metal atoms. The calculations showed that rhodium was bound stronger to the substrate probably due to stronger polarization effects.
Published: 2009
Full Text: View/download PDF

17. Assessment of Digital Image Correlation Measurement Errors: Methodology and Results

Author: Marina Fazzini, Yves Surrel, Pascal Doumalin, Pierre Vacher, Jean-Christophe Dupré, Fabrice Brémand, Jean-José Orteu, Jérôme Molimard, Bertrand Wattrisse, Michel Bornert, Michel Grédia, François Hild, Sébastien Mistou, Laurent Robert, Laboratoire de mécanique des solides (LMS), École polytechnique (X)-MINES ParisTech - École nationale supérieure des mines de Paris, Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL)-Centre National de la Recherche Scientifique (CNRS), Laboratoire Génie de Production (LGP), Ecole Nationale d'Ingénieurs de Tarbes, Laboratoire de Mécanique et Ingénieries (LAMI), Institut Français de Mécanique Avancée (IFMA)-Université Blaise Pascal - Clermont-Ferrand 2 (UBP), Laboratoire de Mécanique et Technologie (LMT), École normale supérieure - Cachan (ENS Cachan)-Université Pierre et Marie Curie - Paris 6 (UPMC)-Centre National de la Recherche Scientifique (CNRS), Laboratoire Hubert Curien [Saint Etienne] (LHC), Institut d'Optique Graduate School (IOGS)-Université Jean Monnet [Saint-Étienne] (UJM)-Centre National de la Recherche Scientifique (CNRS), Centre de Recherche Outillages, Matériaux et Procédés (CROMeP), IMT École nationale supérieure des Mines d'Albi-Carmaux (IMT Mines Albi), Institut Mines-Télécom [Paris] (IMT)-Institut Mines-Télécom [Paris] (IMT), Visuol technologies (Metz, France), Laboratoire SYstèmes et Matériaux pour la MEcatronique (SYMME), Université Savoie Mont Blanc (USMB [Université de Savoie] [Université de Chambéry]), ThermoMécanique des Matériaux (ThM2), Laboratoire de Mécanique et Génie Civil (LMGC), Université de Montpellier (UM)-Centre National de la Recherche Scientifique (CNRS)-Université de Montpellier (UM)-Centre National de la Recherche Scientifique (CNRS), Ecole Nationale Supérieure des Mines de Saint-Etienne - ENSMSE (FRANCE), Ecole Normale Supérieure de Cachan - ENS Cachan (FRANCE), Ecole nationale supérieure des Mines d'Albi-Carmaux - IMT Mines Albi (FRANCE), Institut National Polytechnique de Toulouse - INPT (FRANCE), Université Blaise Pascal - UBP (FRANCE), Université de Montpellier 2 (FRANCE), Université de Poitiers (FRANCE), Ecole Polytechnique (FRANCE), Université de Savoie Mont Blanc - USMB (FRANCE), Visuol Technologies (FRANCE), Laboratoire SYstèmes et Matériaux pour la MEcatronique - SYMME (Annecy, France), École polytechnique (X)-Mines Paris - PSL (École nationale supérieure des mines de Paris), Ecole Nationale d'Ingénieurs de Tarbes (ENIT), Institut National Polytechnique (Toulouse) (Toulouse INP), Université de Toulouse (UT)-Université de Toulouse (UT)-Institut National Polytechnique (Toulouse) (Toulouse INP), Université de Toulouse (UT)-Université de Toulouse (UT), Laboratoire Hubert Curien (LHC), Institut d'Optique Graduate School (IOGS)-Université Jean Monnet - Saint-Étienne (UJM)-Centre National de la Recherche Scientifique (CNRS), and Institut National Polytechnique de Toulouse - Toulouse INP (FRANCE)
Subjects: Digital image correlation, Computer science, Aerospace Engineering, Displacement resolution, Image processing, 02 engineering and technology, 01 natural sciences, [PHYS.MECA.MEMA]Physics [physics]/Mechanics [physics]/Mechanics of materials [physics.class-ph], 010309 optics, Digital image, Optics, 0203 mechanical engineering, [SPI.MECA.MEMA]Engineering Sciences [physics]/Mechanics [physics.med-ph]/Mechanics of materials [physics.class-ph], 0103 physical sciences, Digital image processing, Image resolution, Spatial resolution, Observational error, Uncertainty assessment Benchmark Speckle pattern Texture, business.industry, Mechanical Engineering, 020303 mechanical engineering & transports, Mechanics of Materials, Error assessment, Displacement field, Mécanique des matériaux, business, Algorithm, Interpolation
Abstract: International audience; Optical full-field measurement methods such as Digital Image Correlation (DIC) are increasingly used in the field of experimental mechanics, but they still suffer from a lack of information about their metrological performances. To assess the performance of DIC techniques and give some practical rules for users, a collaborative work has been carried out by the Workgroup "Metrology" of the French CNRS research network 2519 "MCIMS (Mesures de Champs et Identification en Mécanique des Solides / Full-field measurement and identification in solid mechanics, http://www.ifma.fr/lami/gdr2519)". A methodology is proposed to assess the metrological performances of the image processing algorithms that constitute their main component, the knowledge of which being required for a global assessment of the whole measurement system. The study is based on displacement error assessment from synthetic speckle images. Series of synthetic reference and deformed images with random patterns have been generated, assuming a sinusoidal displacement field with various frequencies and amplitudes. Displacements are evaluated by several DIC packages based on various formulations and used in the French community. Evaluated displacements are compared with the exact imposed values and errors are statistically analyzed. Results show general trends rather independent of the implementations but strongly correlated with the assumptions of the underlying algorithms. Various error regimes are identified, for which the dependence of the uncertainty with the parameters of the algorithms, such as subset size, gray level interpolation or shape functions, is discussed.
Published: 2008
Full Text: View/download PDF

18. Stimulation of the grape berry expansion by ethylene and effects on related gene transcripts, over the ripening phase

Author: Nancy Terrier, Mohamed Zouine, Jean-Paul Roustan, Christian Chervin, Arak Tira-Umphon, Dany Severac, Génomique et Biotechnologie des Fruits (GBF), Institut National de la Recherche Agronomique (INRA)-École nationale supérieure agronomique de Toulouse [ENSAT]-Institut National Polytechnique (Toulouse) (Toulouse INP), Université Fédérale Toulouse Midi-Pyrénées-Université Fédérale Toulouse Midi-Pyrénées, École nationale supérieure agronomique de Toulouse [ENSAT], Sciences Pour l'Oenologie (SPO), Institut national d’études supérieures agronomiques de Montpellier (Montpellier SupAgro), Institut national d'enseignement supérieur pour l'agriculture, l'alimentation et l'environnement (Institut Agro)-Institut national d'enseignement supérieur pour l'agriculture, l'alimentation et l'environnement (Institut Agro)-Université Montpellier 1 (UM1)-Université de Montpellier (UM)-Institut National de la Recherche Agronomique (INRA), Institut de Génomique Fonctionnelle - Montpellier GenomiX (IGF MGX), Institut de Génomique Fonctionnelle (IGF), Université de Montpellier (UM)-Université Montpellier 1 (UM1)-Institut National de la Santé et de la Recherche Médicale (INSERM)-Université Montpellier 2 - Sciences et Techniques (UM2)-Centre National de la Recherche Scientifique (CNRS)-Université de Montpellier (UM)-Université Montpellier 1 (UM1)-Institut National de la Santé et de la Recherche Médicale (INSERM)-Université Montpellier 2 - Sciences et Techniques (UM2)-Centre National de la Recherche Scientifique (CNRS), Institut National de la Recherche Agronomique - INRA (FRANCE), Institut National de la Santé et de la Recherche Médicale - INSERM (FRANCE), Institut National Polytechnique de Toulouse - Toulouse INP (FRANCE), Montpellier SupAgro (FRANCE), Université de Montpellier 2 (FRANCE), Université de Montpellier 1 (FRANCE), Université Montpellier 1 (UM1)-Institut National de la Recherche Agronomique (INRA)-Université de Montpellier (UM)-Institut national d’études supérieures agronomiques de Montpellier (Montpellier SupAgro), Université Montpellier 1 (UM1)-Université Montpellier 2 - Sciences et Techniques (UM2)-Institut National de la Santé et de la Recherche Médicale (INSERM)-Centre National de la Recherche Scientifique (CNRS)-Université Montpellier 1 (UM1)-Université Montpellier 2 - Sciences et Techniques (UM2)-Institut National de la Santé et de la Recherche Médicale (INSERM)-Centre National de la Recherche Scientifique (CNRS), and ProdInra, Migration
Subjects: 0106 biological sciences, Ethylene, food.ingredient, Agronomie, Pectin, Physiology, [SDV]Life Sciences [q-bio], Biotechnologies, Plant Science, Berry, Biology, Genes, Plant, Polymerase Chain Reaction, 01 natural sciences, Veraison, Cell wall, 03 medical and health sciences, chemistry.chemical_compound, food, Gene Expression Regulation, Plant, Genetics, [SDV.BV]Life Sciences [q-bio]/Vegetal Biology, [SDV.BV] Life Sciences [q-bio]/Vegetal Biology, Vitis, RNA, Messenger, Oligonucleotide Array Sequence Analysis, 030304 developmental biology, 0303 health sciences, Cabernet Sauvignon, Ripening, food and beverages, Plant physiology, Cell Biology, General Medicine, Ethylenes, Xyloglucan, chemistry, Biochemistry, Fruit, Gene pool, Biologie végétale, 010606 plant biology & botany
Abstract: Correspondance: chervin@ensat.fr; International audience; Grape is considered as a non-climacteric fruit, the maturation of which is independent of ethylene. However, previous work had shown that ethylene is capable of affecting the physiological processes during maturation of grape berries. Experiments were designed to screen the gene pool affected by ethylene at the ripening inception in Cabernet Sauvignon berries. The results showed that only 73 of 14 562 genes of microarray slides were significantly modulated by a 24-h ethylene treatment (4 mu l l(-1)), performed 8 weeks after flowering. The study then focused on accumulation of several mRNAs affected by ethylene in relation to the berry size. Indeed, we observed that ethylene application at veraison led to a berry diameter increase. This increase is mainly because of sap intake and cell wall modifications, enabling cell elongation. This was related to changes in the expression pattern of many genes, classified in two groups: (1) 'water exchange' genes: various aquaporins (AQUA) and (2) 'cell wall structure' genes: polygalacturonases, xyloglucan endotransglucosylases (XTH), pectin methyl esterases, cellulose synthases and expansins. The expression patterns were followed either along berry development or in three berry tissues (peel, pulp and seeds). Ethylene stimulates the accumulation of most gene transcripts in 1 h, and in several parts of the berry, this stimulation may last for 24 h in some cases. One XTH and one AQUA seem to be good candidates to explain the ethylene-induced berry expansion. This work brings more clues about the ethylene involvement in the development and ripening of grape berries
Published: 2008
Full Text: View/download PDF

19. Out of the rivers: are some aquatic hyphomycetes plant endophytes?

Author: Martin Vohník, Marc-André Selosse, Eric Chauvet, Centre de Coopération Internationale en Recherche Agronomique - CIRAD (FRANCE), Centre National de la Recherche Scientifique - CNRS (FRANCE), Institut National Polytechnique de Toulouse - Toulouse INP (FRANCE), Institut National de la Recherche Agronomique - INRA (FRANCE), Institut de Recherche pour le Développement - IRD (FRANCE), Montpellier SupAgro (FRANCE), Université Toulouse III - Paul Sabatier - UT3 (FRANCE), Université de Montpellier 1 (FRANCE), Université de Montpellier 2 (FRANCE), Ecole Pratique des Hautes Etudes - EPHE (FRANCE), Charles University (CEZCH REPUBLIC), Université de Montpellier 3 (FRANCE), Laboratoire Ecologie Fonctionnelle et Environnement (ECOLAB), Université Toulouse III - Paul Sabatier (UT3), Université Fédérale Toulouse Midi-Pyrénées-Université Fédérale Toulouse Midi-Pyrénées-Institut Ecologie et Environnement (INEE), Centre National de la Recherche Scientifique (CNRS)-Centre National de la Recherche Scientifique (CNRS)-Institut National Polytechnique (Toulouse) (Toulouse INP), Université Fédérale Toulouse Midi-Pyrénées-Observatoire Midi-Pyrénées (OMP), Météo France-Centre National d'Études Spatiales [Toulouse] (CNES)-Université Fédérale Toulouse Midi-Pyrénées-Centre National de la Recherche Scientifique (CNRS)-Institut de Recherche pour le Développement (IRD)-Météo France-Centre National d'Études Spatiales [Toulouse] (CNES)-Centre National de la Recherche Scientifique (CNRS)-Institut de Recherche pour le Développement (IRD)-Centre National de la Recherche Scientifique (CNRS), Centre d’Ecologie Fonctionnelle et Evolutive (CEFE), Université Paul-Valéry - Montpellier 3 (UPVM)-Institut National de la Recherche Agronomique (INRA)-Centre international d'études supérieures en sciences agronomiques (Montpellier SupAgro)-École Pratique des Hautes Études (EPHE), Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL)-Université de Montpellier (UM)-Centre National de la Recherche Scientifique (CNRS)-Institut de Recherche pour le Développement (IRD [France-Sud])-Institut national d’études supérieures agronomiques de Montpellier (Montpellier SupAgro), Department of plant physiology, Charles University [Prague] (CU), Laboratoire Ecologie Fonctionnelle et Environnement (LEFE), Institut Ecologie et Environnement (INEE), Centre National de la Recherche Scientifique (CNRS)-Centre National de la Recherche Scientifique (CNRS)-Université Toulouse III - Paul Sabatier (UT3), Université de Toulouse (UT)-Université de Toulouse (UT)-Observatoire Midi-Pyrénées (OMP), Institut de Recherche pour le Développement (IRD)-Université Toulouse III - Paul Sabatier (UT3), Université de Toulouse (UT)-Université de Toulouse (UT)-Institut national des sciences de l'Univers (INSU - CNRS)-Centre National d'Études Spatiales [Toulouse] (CNES)-Centre National de la Recherche Scientifique (CNRS)-Météo-France -Institut de Recherche pour le Développement (IRD)-Institut national des sciences de l'Univers (INSU - CNRS)-Centre National d'Études Spatiales [Toulouse] (CNES)-Centre National de la Recherche Scientifique (CNRS)-Météo-France -Centre National de la Recherche Scientifique (CNRS)-Institut National Polytechnique (Toulouse) (Toulouse INP), and Université de Toulouse (UT)
Subjects: 0106 biological sciences, Microfungi, Physiology, Plant Science, Hyphomycetes, Ingoldian, 010603 evolutionary biology, 01 natural sciences, Endophyte, Plant use of endophytic fungi in defense, Rivers, Symbiosis, Saprophyte, Botany, Ecosystem, ComputingMilieux_MISCELLANEOUS, [SDV.EE]Life Sciences [q-bio]/Ecology, environment, Ecologie, Environnement, River, Life Cycle, biology, Ecology, Aquatic ecosystem, Plants, biology.organism_classification, Spore, Mitosporic Fungi, 010606 plant biology & botany
Abstract: International audience; Ingoldian fungi, or aquatic hyphomycetes, are asexual microfungi, mostly ascomycetes, commonly occurring in running freshwater. They grow on dead plant material, such as leaves and twigs, and play a major role in nutrient flows in stream ecosystems (Bärlocher, 1992). They were discovered and first extensively studied by Ingold (1942) and were thus named "Ingoldian" fungi. Ingold described their abundant multicellular asexual spores of sigmoid or, more typically, tetraradiate shape (Fig. 1). He recognized that they probably arose from multiple convergent evolutions, by secondary adaptation to aquatic life, as recently confirmed by molecular markers (Belliveau & Bärlocher, 2005; Baschien et al., 2006). Because of their apparent lack of sexuality, Ingoldian species were placed in asexual genera, such as Tricladium or Tetracladium, based on conidial morphology and/or mode of conidiogenesis. Unexpectedly, several lines of evidence now suggest that some Ingoldian fungi are also plant endophytes, that is, they grow in plants without producing symptoms.[...]
Published: 2008
Full Text: View/download PDF

20. Recursive hybrid Cramer-Rao bound for discrete-time Markovian dynamic systems

Author: Pascal Larzabal, François Vincent, Jerome Galy, Chengfang Ren, Eric Chaumette, Alexandre Renaux, Laboratoire des signaux et systèmes ( L2S ), Université Paris-Sud - Paris 11 ( UP11 ) -CentraleSupélec-Centre National de la Recherche Scientifique ( CNRS ), Laboratoire d'Informatique de Robotique et de Microélectronique de Montpellier ( LIRMM ), Université de Montpellier ( UM ) -Centre National de la Recherche Scientifique ( CNRS ), Département Electronique, Optronique et Signal ( DEOS ), Institut Supérieur de l'Aéronautique et de l'Espace ( ISAE-SUPAERO ), Systèmes et Applications des Technologies de l'Information et de l'Energie ( SATIE ), Centre National de la Recherche Scientifique ( CNRS ) -Conservatoire National des Arts et Métiers [CNAM] ( CNAM ) -Université de Cergy Pontoise ( UCP ), Université Paris-Seine-Université Paris-Seine-École normale supérieure - Rennes ( ENS Rennes ) -Université Paris-Sud - Paris 11 ( UP11 ) -École normale supérieure - Cachan ( ENS Cachan ) -Institut Français des Sciences et Technologies des Transports, de l'Aménagement et des Réseaux ( IFSTTAR ), Institut Supérieur de l'Aéronautique et de l'Espace - ISAE-SUPAERO (FRANCE), Université de Montpellier 2 (FRANCE), Université Paris-Sud 11 (FRANCE), Laboratoire d'Informatique de Robotique et de Microélectronique de Montpellier - LIRMM (Montpellier, France), Laboratoire des signaux et systèmes (L2S), Université Paris-Sud - Paris 11 (UP11)-CentraleSupélec-Centre National de la Recherche Scientifique (CNRS), Laboratoire d'Informatique de Robotique et de Microélectronique de Montpellier (LIRMM), Centre National de la Recherche Scientifique (CNRS)-Université de Montpellier (UM), Département Electronique, Optronique et Signal (DEOS), Institut Supérieur de l'Aéronautique et de l'Espace (ISAE-SUPAERO), Systèmes et Applications des Technologies de l'Information et de l'Energie (SATIE), École normale supérieure - Cachan (ENS Cachan)-Université Paris-Sud - Paris 11 (UP11)-Institut Français des Sciences et Technologies des Transports, de l'Aménagement et des Réseaux (IFSTTAR)-École normale supérieure - Rennes (ENS Rennes)-Université de Cergy Pontoise (UCP), and Université Paris-Seine-Université Paris-Seine-Conservatoire National des Arts et Métiers [CNAM] (CNAM)-Centre National de la Recherche Scientifique (CNRS)
Subjects: 0209 industrial biotechnology, Mathematical optimization, [ INFO.INFO-TS ] Computer Science [cs]/Signal and Image Processing, Markov process, 02 engineering and technology, Upper and lower bounds, Electronic mail, symbols.namesake, 020901 industrial engineering & automation, [INFO.INFO-TS]Computer Science [cs]/Signal and Image Processing, Autre, Dynamic Markovian systems, 0202 electrical engineering, electronic engineering, information engineering, Parameter estimation, Applied mathematics, Electrical and Electronic Engineering, Mathematics, Estimation theory, Applied Mathematics, estimation error lower bound, Estimation error lower bound, 020206 networking & telecommunications, dynamic Markovian systems, Discrete time and continuous time, Signal Processing, symbols, Cramér–Rao bound, Recursive Bayesian estimation, Statistical signal processing
Abstract: International audience; In statistical signal processing, hybrid parameter estimation refers to the case where the parameters vector to estimate contains both non-random and random parameters. As a contribution to the hybrid estimation framework, we introduce a recursive hybrid Cramér Rao lower bounds for discrete-time Markovian dynamic systems depending on unknown determinis-tic parameters. Additionnally, the regularity conditions required for its existence and its use are clarified.
Published: 2015
Full Text: View/download PDF

21. Catalytic ozonation with γ-Al2O3 to enhance the degradation of refractory organics in water

Author: Hubert Debellefontaine, Julie Mendret, Frédéric Thibault-Starzyk, Hervé Leclerc, Wael Aboussaoud, Marie-Hélène Manero, Jean-Stéphane Pic, Stephan Brosillon, Karine Faucher, Anne Galarneau, Nicolas Lesage, Jullian Vittenet, Centre National de la Recherche Scientifique - CNRS (FRANCE), Ecole Nationale Supérieure d'Ingénieurs de Caen - ENSICAEN (FRANCE), Ecole Nationale Supérieure de Chimie de Montpellier - ENSCM (FRANCE), Institut National Polytechnique de Toulouse - Toulouse INP (FRANCE), Institut National de la Recherche Agronomique - INRA (FRANCE), Institut National des Sciences Appliquées de Toulouse - INSA (FRANCE), Total (FRANCE), Université Toulouse III - Paul Sabatier - UT3 (FRANCE), Université de Caen Basse-Normandie (FRANCE), Université de Montpellier 1 (FRANCE), Université de Montpellier 2 (FRANCE), Laboratoire Catalyse et Spectrochimie - LCS (Caen, France), Institut Charles Gerhardt Montpellier - Institut de Chimie Moléculaire et des Matériaux de Montpellier (ICGM ICMMM), Université Montpellier 1 (UM1)-Université Montpellier 2 - Sciences et Techniques (UM2)-Ecole Nationale Supérieure de Chimie de Montpellier (ENSCM)-Université de Montpellier (UM)-Centre National de la Recherche Scientifique (CNRS), Institut Européen des membranes (IEM), Université de Montpellier (UM)-Université Montpellier 2 - Sciences et Techniques (UM2)-Ecole Nationale Supérieure de Chimie de Montpellier (ENSCM)-Centre National de la Recherche Scientifique (CNRS), Laboratoire d'Ingénierie des Systèmes Biologiques et des Procédés (LISBP), Centre National de la Recherche Scientifique (CNRS)-Institut National des Sciences Appliquées - Toulouse (INSA Toulouse), Institut National des Sciences Appliquées (INSA)-Institut National des Sciences Appliquées (INSA)-Institut National de la Recherche Agronomique (INRA), Institut National Polytechnique (Toulouse) (Toulouse INP), Université Fédérale Toulouse Midi-Pyrénées, Laboratoire catalyse et spectrochimie (LCS), Université de Caen Normandie (UNICAEN), Normandie Université (NU)-Normandie Université (NU)-École Nationale Supérieure d'Ingénieurs de Caen (ENSICAEN), Normandie Université (NU)-Centre National de la Recherche Scientifique (CNRS), Institut National Polytechnique de Toulouse - INPT (FRANCE), Université Montpellier 1 (UM1)-Université Montpellier 2 - Sciences et Techniques (UM2)-Ecole Nationale Supérieure de Chimie de Montpellier (ENSCM)-Institut de Chimie du CNRS (INC)-Université de Montpellier (UM)-Centre National de la Recherche Scientifique (CNRS), Centre National de la Recherche Scientifique (CNRS)-Ecole Nationale Supérieure de Chimie de Montpellier (ENSCM)-Université Montpellier 2 - Sciences et Techniques (UM2)-Institut de Chimie du CNRS (INC)-Université de Montpellier (UM), Centre National de la Recherche Scientifique (CNRS)-École Nationale Supérieure d'Ingénieurs de Caen (ENSICAEN), Normandie Université (NU)-Normandie Université (NU)-Institut de Chimie du CNRS (INC)-Université de Caen Normandie (UNICAEN), Normandie Université (NU), French National Agency for Research (ANR) through convention ANR ECOTECH project PETZECO [1081C0230/ANR-10-ECOT-011-03], ANR-10-ECOT-0011,PETZECO(2010), Institut Charles Gerhardt Montpellier - Institut de Chimie Moléculaire et des Matériaux de Montpellier (ICGM), Ecole Nationale Supérieure de Chimie de Montpellier (ENSCM)-Institut de Chimie du CNRS (INC)-Université de Montpellier (UM)-Centre National de la Recherche Scientifique (CNRS), Institut National de la Recherche Agronomique (INRA)-Institut National des Sciences Appliquées - Toulouse (INSA Toulouse), Institut National des Sciences Appliquées (INSA)-Université de Toulouse (UT)-Institut National des Sciences Appliquées (INSA)-Université de Toulouse (UT)-Centre National de la Recherche Scientifique (CNRS), Université de Toulouse (UT), and Normandie Université (NU)-Institut de Chimie du CNRS (INC)-Centre National de la Recherche Scientifique (CNRS)
Subjects: Formic acid, Oxalic acid, 02 engineering and technology, Wastewater treatment, 010501 environmental sciences, Advanced oxidation process, 01 natural sciences, Catalysis, chemistry.chemical_compound, Acetic acid, Adsorption, [CHIM.GENI]Chemical Sciences/Chemical engineering, Al2O3, Organic chemistry, Phenol, Génie chimique, [SPI.GPROC]Engineering Sciences [physics]/Chemical and Process Engineering, Lewis acids and bases, Génie des procédés, 0105 earth and related environmental sciences, Chemistry, Process Chemistry and Technology, [CHIM.CATA]Chemical Sciences/Catalysis, 021001 nanoscience & nanotechnology, 6. Clean water, 13. Climate action, Catalytic ozonation, 0210 nano-technology, Nuclear chemistry
Abstract: International audience; Nowadays, heterogeneous catalytic ozonation appears as a promising way to treat industrial wastewaters containing refractory pollutants, which resist to biological treatments. Several oxides and minerals have been used and their behavior is subject to controversy with particularly the role of Lewis acid sites and/or basic sites and the effect of salts. In this study, millimetric mesoporous γ-Al2O3 particles suitable for industrial processes were used for enhancing the ozonation efficiency of petrochemical effluents without pH adjustment. A phenol (2,4-dimethylphenol (2,4-DMP)) was first chosen as petrochemical refractory molecule to evaluate the influence of alumina in ozonation. Single ozonation and ozonation in presence of γ-Al2O3 led to the disappearance of 2,4-DMP in 25 min and a decrease in pH from 4.5 to 2.5. No adsorption of 2,4-DMP occurred on γ-Al2O3. Adding γ-Al2O3 in the process resulted in an increase of the 2,4–DMP oxidation level. Indeed, the total organic carbon (TOC) removal was 14% for a single ozonation and 46% for ozonation with γ-Al2O3. Similarly, chemical oxygen demand (COD) removal increases from 35 to 75%, respectively. Various oxidized by-products were produced during the degradation of 2,4-DMP, but after 5 h ozonation 90% of organic by-products were acetic acid > formic acid ≫ oxalic acid. Some of the carboxylic acids were adsorbed on γ-Al2O3. The use of radical scavengers (tert-butanol) highlighted the involvement of hydroxyl radicals during catalytic ozonation with γ-Al2O3 in contrary to single ozonation, which mainly involved direct ozone reaction. γ-Al2O3 is an amphoteric solid with Lewis acid AlOH(H+) sites and basicAl-OH sites. After ozonation the amount of basic sites decreased due to carboxylates adsorption, while the Lewis acid sites remained constant as evidenced by FTIR. Several ozonation runs with γ-Al2O3 reported a progressive decrease of its catalytic activity due to the cumulative sorption of carboxylates on the basic sites. After 80 h of ozonation, a calcination at 550 °C allowed to recover allAl-OH basic sites and the initial activity of γ-Al2O3. A synthetic petrochemical effluent containing various petrochemicals (phenol, acetic acid, naphtenic acid, pyrene, naphtalene) was then treated with γ-Al2O3 with and without NaCl. Sodium ions prevented carboxylates adsorption on γ-Al2O3 leading to a higher efficiency of γ-Al2O3 in presence of NaCl and allowed to decrease the toxicity of the petrochemical effluent.
Published: 2015
Full Text: View/download PDF

22. Integrating hydrological features and genetically validated occurrence data in occupancy modeling of an endemic and endangered semi-aquatic mammal species, Galemys pyrenaicus, in a Pyrenean catchment

Author: François Gillet, Frank D'Amico, Stéphane Aulagnier, Mélanie Némoz, F. Blanc, Marjorie Biffi, José-Miguel Sánchez-Pérez, Laëtitia Buisson, Johan Michaux, Pascal Laffaille, Vincent Lacaze, Christian Pagé, Aurélien Besnard, Anaïs Charbonnel, Sabine Sauvage, Conservatoire d'Espaces Naturels Midi-Pyrénées - CEN MP (FRANCE), Laboratoire Ecologie Fonctionnelle et Environnement (LEFE), Institut Ecologie et Environnement (INEE), Centre National de la Recherche Scientifique (CNRS)-Centre National de la Recherche Scientifique (CNRS)-Université Toulouse III - Paul Sabatier (UT3), Université de Toulouse (UT)-Université de Toulouse (UT)-Observatoire Midi-Pyrénées (OMP), Institut de Recherche pour le Développement (IRD)-Université Toulouse III - Paul Sabatier (UT3), Université de Toulouse (UT)-Université de Toulouse (UT)-Institut national des sciences de l'Univers (INSU - CNRS)-Centre National d'Études Spatiales [Toulouse] (CNES)-Centre National de la Recherche Scientifique (CNRS)-Météo-France -Institut de Recherche pour le Développement (IRD)-Institut national des sciences de l'Univers (INSU - CNRS)-Centre National d'Études Spatiales [Toulouse] (CNES)-Centre National de la Recherche Scientifique (CNRS)-Météo-France -Centre National de la Recherche Scientifique (CNRS)-Institut National Polytechnique (Toulouse) (Toulouse INP), Université de Toulouse (UT), Laboratoire de Mathématiques et de leurs Applications [Pau] (LMAP), Université de Pau et des Pays de l'Adour (UPPA)-Centre National de la Recherche Scientifique (CNRS), Centre d’Ecologie Fonctionnelle et Evolutive (CEFE), Université Paul-Valéry - Montpellier 3 (UPVM)-Institut National de la Recherche Agronomique (INRA)-Centre international d'études supérieures en sciences agronomiques (Montpellier SupAgro)-École Pratique des Hautes Études (EPHE), Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL)-Université de Montpellier (UM)-Centre National de la Recherche Scientifique (CNRS)-Institut de Recherche pour le Développement (IRD [France-Sud])-Institut national d’études supérieures agronomiques de Montpellier (Montpellier SupAgro), Unité de recherche Comportement et Ecologie de la Faune Sauvage (CEFS), Institut National de la Recherche Agronomique (INRA), Laboratoire de Génétique des Microorganismes, Université de Liège - Gembloux, Association des Naturalistes de l'Ariège (FRANCE), Centre Européen de Recherche et de Formation Avancée en Calcul Scientifique (CERFACS), ANRT [2011/1018], EDF (Electricite de France), European Union (FEDER), Laboratoire Ecologie Fonctionnelle et Environnement (ECOLAB), Université Toulouse III - Paul Sabatier (UT3), Université Fédérale Toulouse Midi-Pyrénées-Université Fédérale Toulouse Midi-Pyrénées-Institut Ecologie et Environnement (INEE), Centre National de la Recherche Scientifique (CNRS)-Centre National de la Recherche Scientifique (CNRS)-Institut National Polytechnique (Toulouse) (Toulouse INP), Université Fédérale Toulouse Midi-Pyrénées-Observatoire Midi-Pyrénées (OMP), Météo France-Centre National d'Études Spatiales [Toulouse] (CNES)-Université Fédérale Toulouse Midi-Pyrénées-Centre National de la Recherche Scientifique (CNRS)-Institut de Recherche pour le Développement (IRD)-Météo France-Centre National d'Études Spatiales [Toulouse] (CNES)-Centre National de la Recherche Scientifique (CNRS)-Institut de Recherche pour le Développement (IRD)-Centre National de la Recherche Scientifique (CNRS), Centre National de la Recherche Scientifique (CNRS)-Université de Montpellier (UM)-École pratique des hautes études (EPHE), Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL)-Centre international d'études supérieures en sciences agronomiques (Montpellier SupAgro)-Institut National de la Recherche Agronomique (INRA)-Université Paul-Valéry - Montpellier 3 (UPVM)-Institut national d’études supérieures agronomiques de Montpellier (Montpellier SupAgro), Institut national d'enseignement supérieur pour l'agriculture, l'alimentation et l'environnement (Institut Agro)-Institut national d'enseignement supérieur pour l'agriculture, l'alimentation et l'environnement (Institut Agro)-Institut de Recherche pour le Développement (IRD [France-Sud]), CERFACS, Université Fédérale Toulouse Midi-Pyrénées-Université Fédérale Toulouse Midi-Pyrénées-Observatoire Midi-Pyrénées (OMP), Université Fédérale Toulouse Midi-Pyrénées-Centre National de la Recherche Scientifique (CNRS)-Institut National Polytechnique (Toulouse) (Toulouse INP), Université Fédérale Toulouse Midi-Pyrénées, Biogéographie et Écologie des Vertébrés (EPHE), École pratique des hautes études (EPHE), Conservatoire Régional des Espaces Naturels Midi-Pyrénées - CREN (FRANCE), Centre de Coopération Internationale en Recherche Agronomique - CIRAD (FRANCE), Centre National de la Recherche Scientifique - CNRS (FRANCE), Institut National Polytechnique de Toulouse - Toulouse INP (FRANCE), Montpellier SupAgro (FRANCE), Université Toulouse III - Paul Sabatier - UT3 (FRANCE), Université de Liège (BELGIUM), Université de Montpellier 1 (FRANCE), Université de Montpellier 2 (FRANCE), Ecole Pratique des Hautes Etudes - EPHE (FRANCE), Université de Pau et des Pays de l'Adour - UPPA (FRANCE), Université de Montpellier 3 (FRANCE), Laboratoire Ecologie fonctionnelle et Environnement - EcoLab (Toulouse, France), Centre Européen de Recherche et Formation Avancées en Calcul Scientifique - CERFACS (Toulouse, France), and Institut National Polytechnique de Toulouse - INPT (FRANCE)
Subjects: 0106 biological sciences, Occupancy, [SDV]Life Sciences [q-bio], Endangered species, 010603 evolutionary biology, 01 natural sciences, [SDV.EE.ECO]Life Sciences [q-bio]/Ecology, environment/Ecosystems, Soil and water assessment tool, 14. Life underwater, [SDU.STU.HY]Sciences of the Universe [physics]/Earth Sciences/Hydrology, Galemys pyrenaicus, Pyrenean desman, Hydrologie, Ecology, Evolution, Behavior and Systematics, ComputingMilieux_MISCELLANEOUS, Nature and Landscape Conservation, Ecologie, Environnement, Markovian site occupancy model, [SDV.EE]Life Sciences [q-bio]/Ecology, environment, Habitat fragmentation, biology, Ecology, [SDE.IE]Environmental Sciences/Environmental Engineering, 010604 marine biology & hydrobiology, 15. Life on land, biology.organism_classification, Environmental niche modelling, Desman, Detection, Geography, Ecosystèmes, Habitat, Habitat use, 13. Climate action, Threatened species, [SDE]Environmental Sciences
Abstract: International audience; As freshwater habitats are among the most endangered, there is an urgent need to identify critical areas for conservation, especially those that are home to endangered species. The Pyrenean desman (Galemys pyrenaicus) is a semi-aquatic mammal whose basic ecological requirements are largely unknown, hindering adequate conservation planning even though it is considered as a threatened species. Species distribution modelling is challenging for freshwater species. Indeed, the complexity of aquatic ecosystems (e.g., linear and hierarchical ordering) must be taken into account as well as imperfect sampling. High-quality and relevant hydrological descriptors should also be used. To understand the influence of environmental covariates on the occupancy and detection of the Pyrenean desman, we combine both a robust sign-survey data set (i.e. with genetic validation ensuring true presence information) and a hydrological model to simulate the flow regime across a whole catchment. Markovian site-occupancy analysis, taking into account sign detection and based on spatially adjacent replicates, indicated a positive influence of heterogeneity of substrate and shelters, and a negative influence of flow variability on Pyrenean desman detection. This valuable information should help to improve monitoring programs for this endangered species. Our results also highlighted a spatially clustered distribution and a positive influence of stream flow and number of tributaries on occupancy. Hence, modifications of flow regime (e.g. hydropower production, irrigation, climate change) and habitat fragmentation appear to be major threats for this species, altering the connectivity between tributaries and the mainstream river as well as between adjacent sub-catchments.
Published: 2015
Full Text: View/download PDF

23. Theoretical analysis of the mass balance equation through a flame at zero and non-zero Mach numbers

Author: Michaël Bauerheim, Franck Nicoud, Thierry Poinsot, Centre Européen de Recherche et de Formation Avancée en Calcul Scientifique (CERFACS), CERFACS, SNECMA Villaroche [Moissy-Cramayel], Safran Group, Institut Montpelliérain Alexander Grothendieck (IMAG), Université de Montpellier (UM)-Centre National de la Recherche Scientifique (CNRS), Institut de mécanique des fluides de Toulouse (IMFT), Université Toulouse III - Paul Sabatier (UT3), Université Fédérale Toulouse Midi-Pyrénées-Université Fédérale Toulouse Midi-Pyrénées-Centre National de la Recherche Scientifique (CNRS)-Institut National Polytechnique (Toulouse) (Toulouse INP), Université Fédérale Toulouse Midi-Pyrénées, Centre National de la Recherche Scientifique - CNRS (FRANCE), Institut National Polytechnique de Toulouse - INPT (FRANCE), Université Toulouse III - Paul Sabatier - UT3 (FRANCE), Université de Montpellier 2 (FRANCE), Société nationale d'étude et de constructions de moteurs d'avion - SNECMA (FRANCE), Institut de Mécanique des Fluides de Toulouse - IMFT (Toulouse, France), and Institut National Polytechnique de Toulouse - Toulouse INP (FRANCE)
Subjects: 020209 energy, General Chemical Engineering, Mécanique des fluides, Entropy, General Physics and Astronomy, Energy Engineering and Power Technology, 02 engineering and technology, Conservation, Mach wave, 01 natural sciences, 010305 fluids & plasmas, [SPI.MECA.MEFL]Engineering Sciences [physics]/Mechanics [physics.med-ph]/Fluids mechanics [physics.class-ph], Physics::Fluid Dynamics, symbols.namesake, 0103 physical sciences, 0202 electrical engineering, electronic engineering, information engineering, Mean flow, [PHYS.MECA.MEFL]Physics [physics]/Mechanics [physics]/Fluid mechanics [physics.class-ph], Conservation of mass, Physics, Conservation law, Mach number, Volume, Mass balance, General Chemistry, Mechanics, Mass, Euler equations, Fuel Technology, Classical mechanics, Balance equation, symbols, Singularities
Abstract: International audience; This paper discusses a classical paradox in thermoacoustics when jump conditions are derived for acoustic waves propagating through a thin flat flame. It shows why volume conservation must be used for perturbations at zero Mach number (continuity of v′=u′A ) while mass conservation is used at non-zero Mach numbers (continuity of View the MathML source ). First, from the three-dimensional mass balance equation, a quasi one-dimensional mass balance equation is obtained for surface-averaged quantities. Then it is demonstrated that the acoustic and entropy disturbances are coupled and need to be solved together at the flame front because singularities in the entropy profile affect mass conservation. At non-zero Mach number, the entropy generated in the thin flame is convected by the mean flow: no singularity occurs and leads to the classical mass conservation at the interface. However, at zero Mach number, the flow is frozen and entropy spots are not convected downstream: they produce a singularity at the flame front due to the mean density gradient, which acts as an additional source term in the mass conservation equation. The proper integration of this source term at zero Mach number leads, not to the mass, but to the volume flow rate conservation of perturbations. A balance equation for the volume flow rate has been also derived. This equation couples the volume flow rate and the mean and fluctuating pressure. This latter equation degenerates naturally toward the volume flow rate conservation at the flame interface at zero Mach number because of the pressure continuity. This theoretical analysis has been compared to LEE (Linearized Euler Equation) simulations of stable flames and a good agreement is found for the entropy fluctuations shape and the conserved quantities.
Published: 2015
Full Text: View/download PDF

24. Pilot-scale integrated process for the treatment of dry-spun acrylic fiber manufacturing wastewater

Author: Xiang Tu, Marie-Hélène Manero, Wang Xin, Bin Li, Zhiyong Tian, Yonghui Song, Stephan Brosillon, Chinese Research Academy of Environmental Sciences, Institut Européen des membranes (IEM), Centre National de la Recherche Scientifique (CNRS)-Ecole Nationale Supérieure de Chimie de Montpellier (ENSCM)-Université Montpellier 2 - Sciences et Techniques (UM2)-Institut de Chimie du CNRS (INC)-Université de Montpellier (UM), Laboratoire de génie chimique [ancien site de Basso-Cambo] (LGC), Université Toulouse III - Paul Sabatier (UT3), Université Fédérale Toulouse Midi-Pyrénées-Université Fédérale Toulouse Midi-Pyrénées-Centre National de la Recherche Scientifique (CNRS)-Institut National Polytechnique (Toulouse) (Toulouse INP), Université Fédérale Toulouse Midi-Pyrénées, Centre National de la Recherche Scientifique - CNRS (FRANCE), Chinese Research Academy of Environmental Sciences - CRAES (CHINA), Ecole Nationale Supérieure de Chimie de Montpellier - ENSCM (FRANCE), Institut National Polytechnique de Toulouse - INPT (FRANCE), Université Toulouse III - Paul Sabatier - UT3 (FRANCE), Université de Montpellier 2 (FRANCE), Université de Montpellier (FRANCE), Institut Européen des Membranes - IEM (Montpellier, France), and Institut National Polytechnique de Toulouse - Toulouse INP (FRANCE)
Subjects: Ocean Engineering, Membrane bioreactor, medicine.disease_cause, Matrix (chemical analysis), Excitation–emission matrix spectroscopy, [CHIM.GENI]Chemical Sciences/Chemical engineering, medicine, Génie chimique, Dry-spun acrylic fiber manufacturing wastewater, [SPI.GPROC]Engineering Sciences [physics]/Chemical and Process Engineering, Génie des procédés, Acrylic fiber, Effluent, Pollutants removal, Water Science and Technology, Integrated process, Chemistry, [SDE.IE]Environmental Sciences/Environmental Engineering, Chemical oxygen demand, Pilot scale, Environmental engineering, Biodegradation, Pulp and paper industry, Pollution, 6. Clean water, Wastewater, Aeration
Abstract: International audience; An integrated process of membrane bioreactor (MBR)—advanced ozonation (AO)—biological aerated filters (BAFs) was developed for the treatment of dry-spun acrylic fiber manufacturing wastewater in pilot scale. The results show that the removal efficiencies of chemical oxygen demand (COD) and ammonia nitrogen (-N) could exceed 90.0 and 95.0%, respectively. The COD concentration in the total effluent was maintained at 80.0–100 mg/L, and the -N concentration was below 10.0 mg/L. Both the MBR and BAFs could adapt to the influent of practical wastewater after a period of sludge acclimatization. The removal efficiencies of COD and -N in the MBR were maintained at 65.8–71.9 and 59.4–67.5%, respectively. Excitation–emission matrix spectroscopy confirmed that most of the easy degradable organics were removed in the MBR process. After the AO treatment, COD concentration in the wastewater was reduced by 106–157 mg/L and the biodegradability was enhanced. Simultaneous nitrification–denitrification was performed in the biofilm of BAFs, and the removal efficiency of total nitrogen was in the range of 58.2–71.6% after the entire integrated process.
Published: 2015
Full Text: View/download PDF

25. A formal verification framework and associated tools for Enterprise Modeling: Application to UEML

Author: François Prunet, Bernard Kamsu-Foguem, Vincent Chapurlat, IMT Mines Alès (FRANCE), Institut National Polytechnique de Toulouse - Toulouse INP (FRANCE), Université Toulouse III - Paul Sabatier - UT3 (FRANCE), Université de Montpellier 2 (FRANCE), and Centre National de la Recherche Scientifique - CNRS (FRANCE)
Subjects: Model checking, UEML, Correctness, General Computer Science, Computer science, business.industry, Verification, Property, General Engineering, Modélisation et simulation, Formal proof, Enterprise modelling, Formal specification, Validation, Systems engineering, Relevance (information retrieval), Software engineering, business, Formal verification, Enterprise modeling, Verification and validation
Abstract: The aim of this paper is to propose and apply a verification and validation approach to Enterprise Modeling that enables the user to improve the relevance and correctness, the suitability and coherence of a model by using properties specification and formal proof of properties.
Published: 2006
Full Text: View/download PDF

26. Actual Impedance of Nonreflecting Boundary Conditions: Implications for Computation of Resonators

Author: Franck Nicoud, Thierry Poinsot, Laurent Selle, Centre National de la Recherche Scientifique - CNRS (FRANCE), Institut National Polytechnique de Toulouse - INPT (FRANCE), Université Toulouse III - Paul Sabatier - UT3 (FRANCE), Université de Montpellier 2 (FRANCE), Institut National Polytechnique de Toulouse - Toulouse INP (FRANCE), Centre Européen de Recherche et de Formation Avancée en Calcul Scientifique (CERFACS), CERFACS, Institut de Mathématiques et de Modélisation de Montpellier (I3M), Centre National de la Recherche Scientifique (CNRS)-Université Montpellier 2 - Sciences et Techniques (UM2)-Université de Montpellier (UM), Institut de mécanique des fluides de Toulouse (IMFT), Université Toulouse III - Paul Sabatier (UT3), Université Fédérale Toulouse Midi-Pyrénées-Université Fédérale Toulouse Midi-Pyrénées-Centre National de la Recherche Scientifique (CNRS)-Institut National Polytechnique (Toulouse) (Toulouse INP), and Université Fédérale Toulouse Midi-Pyrénées
Subjects: Aerospace Engineering, HYPERBOLIC SYSTEMS, 01 natural sciences, Compressible flow, [SPI.MECA.MEFL]Engineering Sciences [physics]/Mechanics [physics.med-ph]/Fluids mechanics [physics.class-ph], Acoustique, 010305 fluids & plasmas, FLOWS, COMBUSTION INSTABILITIES, 0103 physical sciences, AERODYNAMIC SOUND, Mean flow, [PHYS.MECA.MEFL]Physics [physics]/Mechanics [physics]/Fluid mechanics [physics.class-ph], Boundary value problem, 0101 mathematics, WAVE-PROPAGATION, Navier–Stokes equations, EQUATIONS, Mathematics, [SPI.ACOU]Engineering Sciences [physics]/Acoustics [physics.class-ph], Computer simulation, Mathematical analysis, Fluid mechanics, Acoustic wave, [PHYS.MECA.ACOU]Physics [physics]/Mechanics [physics]/Acoustics [physics.class-ph], 010101 applied mathematics, Classical mechanics, Reflection (physics), NUMERICAL-SIMULATION, Non-reflecting boundary conditions, [MATH.MATH-NA]Mathematics [math]/Numerical Analysis [math.NA]
Abstract: International audience; Nonreflecting boundary conditions are essential elements in the computation of many compressible flows. Such simulations are very sensitive to the treatment of acoustic waves at boundaries. Nonreflecting conditions allow acoustic waves to propagate through boundaries with zero or small levels of reflection into the domain. However, perfectly nonreflecting conditions must be avoided because they can lead to ill-posed problems for the mean flow. Various methods have been proposed to construct boundary conditions that can be sufficiently nonreflecting for the acoustic field while still making the mean flow problem well-posed. A widely used technique for nonreflecting outlets is analyzed (Poinsot, T., and Lele, S., "Boundary Conditions for Direct Simulations of Compressible Viscous Flows," Journal of Computational Physics, Vol. 101, No.1,1992, pp. 104-129; Rudy, D. H., and Strikwerda, J. C., "A Non-Reflecting Outflow Boundary Condition for Subsonic Navier-Stokes Calculations," Journal of Computational Physics, Vol. 36, 1980, pp. 55-70). It shows that the correction introduced by these authors can lead to large reflection levels and resonant behavior that cannot be observed in the experiment. A simple scaling is proposed to evaluate the relaxation coefficient used in these methods for a nonreflecting outlet. The proposed scaling is tested for simple cases (ducts) both theoretically and numerically.
Published: 2004
Full Text: View/download PDF

27. Symmetry breaking of azimuthal thermo-acoustic modes in annular cavities: a theoretical study

Author: Pablo Salas, Michaël Bauerheim, Thierry Poinsot, Franck Nicoud, Centre National d'Études Spatiales - CNES (FRANCE), Centre National de la Recherche Scientifique - CNRS (FRANCE), Institut National Polytechnique de Toulouse - INPT (FRANCE), Institut National de la Recherche en Informatique et en Automatique - INRIA (FRANCE), Université Toulouse III - Paul Sabatier - UT3 (FRANCE), Université Toulouse - Jean Jaurès - UT2J (FRANCE), Université de Montpellier 2 (FRANCE), Société nationale d'étude et de constructions de moteurs d'avion - SNECMA (FRANCE), Institut de mathématiques et de modélisation de Montpellier - i3m (Montpellier, France), Centre Européen de Recherche et de Formation Avancée en Calcul Scientifique (CERFACS), CERFACS, Département de génie mécanique [Sherbrooke] (UdeS), Université de Sherbrooke (UdeS), Institut de Mathématiques et de Modélisation de Montpellier (I3M), Centre National de la Recherche Scientifique (CNRS)-Université Montpellier 2 - Sciences et Techniques (UM2)-Université de Montpellier (UM), Institut de mécanique des fluides de Toulouse (IMFT), Université Toulouse III - Paul Sabatier (UT3), Université Fédérale Toulouse Midi-Pyrénées-Université Fédérale Toulouse Midi-Pyrénées-Centre National de la Recherche Scientifique (CNRS)-Institut National Polytechnique (Toulouse) (Toulouse INP), Université Fédérale Toulouse Midi-Pyrénées, and Institut National Polytechnique de Toulouse - Toulouse INP (FRANCE)
Subjects: Chamber, 020209 energy, Mécanique des fluides, Rotational symmetry, Combustion, 02 engineering and technology, combustion instabilities, 01 natural sciences, Electromagnetic radiation, Instability, Seismic wave, 010305 fluids & plasmas, symbols.namesake, Symmetry, Dispersion relation, 0103 physical sciences, 0202 electrical engineering, electronic engineering, information engineering, Symmetry breaking, acoustics, symmetry, Physics, [SPI.ACOU]Engineering Sciences [physics]/Acoustics [physics.class-ph], Mechanical Engineering, [SPI.FLUID]Engineering Sciences [physics]/Reactive fluid environment, Mechanics, Condensed Matter Physics, [INFO.INFO-MO]Computer Science [cs]/Modeling and Simulation, Symmetry (physics), Classical mechanics, Mechanics of Materials, Helmholtz free energy, symbols, azimuthal modes, control
Abstract: Many physical problems containing rotating symmetry exhibit azimuthal waves, from electromagnetic waves in nanophotonic crystals to seismic waves in giant stars. When this symmetry is broken, clockwise (CW) and counter-clockwise (CCW) waves are split into two distinct modes which can become unstable. This paper focuses on a theoretical study of symmetry breaking in annular cavities containing a number $N$ of flames prone to azimuthal thermo-acoustic instabilities. A general dispersion relation for non-perfectly-axisymmetric cavities is obtained and analytically solved to provide an explicit expression for the frequencies and growth rates of all azimuthal modes of the configuration. This analytical study unveils two parameters affecting the stability of the mode: (i) a coupling strength corresponding to the cumulative effects of the $N$ flames and (ii) a splitting strength due to the symmetry breaking when the flames are different. This theory has been validated using a 3D Helmholtz solver and good agreement is found. When only two types of flames are introduced into the annular cavity, the splitting strength is found to depend on two parameters: the difference between the two burner types and the pattern used to distribute the flames along the azimuthal direction. To first order, this theory suggests that the most stable configuration is obtained for a perfectly axisymmetric configuration. Therefore, breaking the symmetry by mixing different flames cannot improve the stability of an annular combustor independently of the flame distribution pattern.
Published: 2014
Full Text: View/download PDF

28. Simulation and modelling of the waves transmission and generation in a stator blade row in a combustion-noise framework

Author: Matthieu Leyko, Stéphane Moreau, Ignacio Duran, Thierry Poinsot, Franck Nicoud, Centre National de la Recherche Scientifique - CNRS (FRANCE), Institut National Polytechnique de Toulouse - Toulouse INP (FRANCE), Université Toulouse III - Paul Sabatier - UT3 (FRANCE), Université de Montpellier 2 (FRANCE), Société nationale d'étude et de constructions de moteurs d'avion - SNECMA (FRANCE), Université de Sherbrooke (CANADA), Institut de mathématiques et de modélisation de Montpellier - i3m (Montpellier, France), SNECMA Villaroche [Moissy-Cramayel], Safran Group, Centre Européen de Recherche et de Formation Avancée en Calcul Scientifique (CERFACS), CERFACS, Université de Technologie de Compiègne (UTC), Institut de Mathématiques et de Modélisation de Montpellier (I3M), Centre National de la Recherche Scientifique (CNRS)-Université Montpellier 2 - Sciences et Techniques (UM2)-Université de Montpellier (UM), Institut de mécanique des fluides de Toulouse (IMFT), Université Toulouse III - Paul Sabatier (UT3), Université Fédérale Toulouse Midi-Pyrénées-Université Fédérale Toulouse Midi-Pyrénées-Centre National de la Recherche Scientifique (CNRS)-Institut National Polytechnique (Toulouse) (Toulouse INP), Université Fédérale Toulouse Midi-Pyrénées, and Institut National Polytechnique de Toulouse - INPT (FRANCE)
Subjects: MECHANISM, Engineering, Acoustics and Ultrasonics, Stator, Mécanique des fluides, Generation, Mechanical engineering, PROPAGATION, Combustion, Transfer function, Turbine, law.invention, FLOWS, TURBOMACHINERY, Physics::Fluid Dynamics, law, Turbomachinery, Transmission, Physics::Chemical Physics, business.industry, Mechanical Engineering, SOUND WAVES, Mechanics, Condensed Matter Physics, [INFO.INFO-MO]Computer Science [cs]/Modeling and Simulation, ACTUATOR DISK THEORY, Mechanics of Materials, NOZZLE, Combustion chamber, Axial symmetry, business, Noise, Large eddy simulation
Abstract: International audience; The combustion noise in aero-engines is known to have two different origins. First, the direct combustion noise is directly generated by the flame itself. Second, the indirect combustion noise is caused by the acceleration in the turbine stages, of entropy spots generated by the combustion. In both cases, the turbo-machinery is involved in the combustion-noise transmission and generation. Numerical simulations are performed in the present study to assess the global noise for a real aeronautical configuration. On the one hand, the acoustic and entropy transfer functions of an isolated blade row are obtained using two-dimensional unsteady simulations. The transfer functions of the blade row are compared with the model of Cumpsty and Marble that assumes an axially compact configuration. On the other hand, the acoustic and entropy sources coming from a combustion chamber are calculated from a three-dimensional Large Eddy Simulation (LES). This allows an evaluation of the error introduced by the model for the present combustion chamber using the previous numerical simulations. A significant error is found for the indirect combustion noise, whereas it stays reasonable for the direct one.
Published: 2014
Full Text: View/download PDF

29. XPS and AES studies of UHTC ZrB2-SiC-Si3N4 treated with solar energy

Author: Beche, Eric, Balat-Pichelin, Marianne, Flaud, Valérie, Esvan, Jérôme, Duguet, Thomas, Sciti, Diletta, Alfano, Davide, Centre National de la Recherche Scientifique - CNRS (FRANCE), Consiglio Nazionale delle Ricerche - CNR (ITALY), Ecole Nationale Supérieure de Chimie de Montpellier - ENSCM (FRANCE), Institut National Polytechnique de Toulouse - INPT (FRANCE), Istituto di Scienza e Tecnologia dei Materiali Ceramici - ISTEC (ITALY), Université Toulouse III - Paul Sabatier - UT3 (FRANCE), Université de Montpellier 1 (FRANCE), Université de Montpellier 2 (FRANCE), Centro Italiano di Ricerche Aerospaziali - CIRA (ITALY), Université Toulouse III - Paul Sabatier - UPS (FRANCE), Laboratoire Procédés, Matériaux et Energie Solaire - PROMES (Perpignan, France), Institut Charles Gerhardt - ICG (Montpellier, France), Centre Interuniversitaire de Recherche et d'Ingénierie des Matériaux - CIRIMAT (Toulouse, France), Procédés, Matériaux et Energie Solaire (PROMES), Université de Perpignan Via Domitia (UPVD)-Centre National de la Recherche Scientifique (CNRS), Institut Charles Gerhardt Montpellier - Institut de Chimie Moléculaire et des Matériaux de Montpellier (ICGM ICMMM), Ecole Nationale Supérieure de Chimie de Montpellier (ENSCM)-Centre National de la Recherche Scientifique (CNRS)-Université de Montpellier (UM)-Université Montpellier 1 (UM1)-Université Montpellier 2 - Sciences et Techniques (UM2)-Institut de Chimie du CNRS (INC), Centre interuniversitaire de recherche et d'ingenierie des matériaux (CIRIMAT), Centre National de la Recherche Scientifique (CNRS)-Université Toulouse III - Paul Sabatier (UT3), Université Fédérale Toulouse Midi-Pyrénées-Université Fédérale Toulouse Midi-Pyrénées-Institut National Polytechnique (Toulouse) (Toulouse INP), Université Fédérale Toulouse Midi-Pyrénées-Institut de Chimie du CNRS (INC), CNR Istituto di Scienza e Tecnologia dei Materiali Ceramici (CNR-ISTEC), Consiglio Nazionale delle Ricerche [Roma] (CNR), Centro Italiano Ricerche Aerospaziali (CIRA ), Agenzia Spaziale Italiana (ASI), and Institut National Polytechnique de Toulouse - Toulouse INP (FRANCE)
Subjects: AES, Ultra-high-temperature ceramics, Matériaux, XPS, [CHIM.MATE]Chemical Sciences/Material chemistry, Silicon carbide, Zirconium diboride, [SPI.MAT]Engineering Sciences [physics]/Materials
Abstract: International audience; The microstructure of ultra-high-temperature ceramics based on the ZrB2–SiC composition and a sintering additive (Si3N4) was investigated using XPS and AES techniques. These ZrB2–SiC–Si3N4 materials were treated in air plasma at high temperature (T > 1750 K) in the MESOX facility developed at the PROMES-CNRS laboratory (Moyen d'Essai Solaire d'OXydation for the measurement of atomic oxygen recombination coefficients). The surfaces were characterized before and after the air plasma treatment. Surface modifications were observed and induced by the oxidation process. The elementary composition was determined using AES and XPS. Core level spectroscopy (XPS) was used to determine the atomic composition and the nature of the chemical bonds from the Zr 3d3/2,5/2, Si 2p1/2,3/2, O 1s and C 1s photoelectron peaks. The microstructural analyses revealed the presence of oxide layers: Silica and zirconia compounds were detected at temperatures near 1800 K, and a zirconia compound was mainly detected above 2200 K.
Published: 2014
Full Text: View/download PDF

30. Mangrove restoration in the vicinity of oil and gas facilities: Lessons learned from a large-scale project

Author: Muhammad Ilman, Eric Dutrieux, François Fromard, Christophe Proisy, Olivier Ponthieux, Romain Walcker, Frederic Pawlowski, Henry Ferdiansyah, Creocean, Botanique et Modélisation de l'Architecture des Plantes et des Végétations (UMR AMAP), Centre National de la Recherche Scientifique (CNRS)-Université de Montpellier (UM)-Institut National de la Recherche Agronomique (INRA)-Centre de Coopération Internationale en Recherche Agronomique pour le Développement (Cirad)-Institut de Recherche pour le Développement (IRD [France-Sud]), Laboratoire Ecologie Fonctionnelle et Environnement (ECOLAB), Université Toulouse III - Paul Sabatier (UT3), Université Fédérale Toulouse Midi-Pyrénées-Université Fédérale Toulouse Midi-Pyrénées-Institut Ecologie et Environnement (INEE), Centre National de la Recherche Scientifique (CNRS)-Centre National de la Recherche Scientifique (CNRS)-Institut National Polytechnique (Toulouse) (Toulouse INP), Université Fédérale Toulouse Midi-Pyrénées-Observatoire Midi-Pyrénées (OMP), Météo France-Centre National d'Études Spatiales [Toulouse] (CNES)-Université Fédérale Toulouse Midi-Pyrénées-Centre National de la Recherche Scientifique (CNRS)-Institut de Recherche pour le Développement (IRD)-Météo France-Centre National d'Études Spatiales [Toulouse] (CNES)-Centre National de la Recherche Scientifique (CNRS)-Institut de Recherche pour le Développement (IRD)-Centre National de la Recherche Scientifique (CNRS), Centre National de la Recherche Scientifique (CNRS), School of Geography Planning and Environmental Management, University of Southern Queensland (USQ), ECO-MED, Total E&P Indonesie, TOTAL SA, Total, Society of Petroleum Engineers (SPE). USA., Centre de Coopération Internationale en Recherche Agronomique - CIRAD (FRANCE), Centre National de la Recherche Scientifique - CNRS (FRANCE), Institut National Polytechnique de Toulouse - Toulouse INP (FRANCE), Institut National de la Recherche Agronomique - INRA (FRANCE), Institut de Recherche pour le Développement - IRD (FRANCE), Total (FRANCE), Université Toulouse III - Paul Sabatier - UT3 (FRANCE), Université de Montpellier 2 (FRANCE), CREOCEAN (FRANCE), ECO-MED (FRANCE), University of Queensland - UQ (AUSTRALIA), BotAnique et BioinforMatique de l'Architecture des Plantes - AMAP (Montpellier, France), Centre de Coopération Internationale en Recherche Agronomique pour le Développement (Cirad)-Institut National de la Recherche Agronomique (INRA)-Université de Montpellier (UM)-Centre National de la Recherche Scientifique (CNRS)-Institut de Recherche pour le Développement (IRD [France-Sud]), Université Fédérale Toulouse Midi-Pyrénées-Université Fédérale Toulouse Midi-Pyrénées-Observatoire Midi-Pyrénées (OMP), Université Fédérale Toulouse Midi-Pyrénées-Centre National de la Recherche Scientifique (CNRS)-Institut National Polytechnique (Toulouse) (Toulouse INP), Université Fédérale Toulouse Midi-Pyrénées, University of Queensland (UQ), and Institut National Polytechnique de Toulouse - INPT (FRANCE)
Subjects: 0106 biological sciences, Delta, Mangrove restoration, [SDV]Life Sciences [q-bio], Biodiversity, 010603 evolutionary biology, 01 natural sciences, Natural (archaeology), Shrimp farming, Aquaculture, 14. Life underwater, Mangrove, Ecologie, Environnement, business.industry, Agroforestry, 010604 marine biology & hydrobiology, Forestry, 15. Life on land, Geography, Petroleum industry, 13. Climate action, Natural recolonization, Restoration, Planting, business
Abstract: Mangroves are critical ecosystems given their key role in conserving biodiversity, protecting coastlines from erosion and supporting coastal resources. They may be impacted by oil and gas activities, either directly or indirectly. Restoring them is therefore of prime importance. In the Mahakam Delta, oil and gas exploration and production have been conducted for more than 40 years. This industry has operated in a quasi-pristine area barely affected by its activities until the mid 80’s. Toward the late 1980’s and until 2000, the delta was subject to massive and rapid development of shrimp farming and by 2001, 80% of the delta mangroves were destroyed and most of it replaced by ponds used for aquaculture. During the 2000’s, shrimps production in the delta decreased due to lack of nutrients in ponds, and a drop in shrimp prices due to the rise of imports worldwide. Numerous ponds were abandoned in the delta. This economic situation generated social instabilities that could threaten the oil and gas industry in the region. Therefore, in order to better protect mangroves and optimize restoration of damaged areas, Total E&P Indonesie has embarked on a mangrove restoration initiative in the Mahakam delta aimed at understanding the restoration processes through both natural recolonization and planting techniques. The general methodology implemented has been to i) describe the land occupation by acquiring satellite images, interpreting aerial photos, conducting field work, and establishing GIS maps, ii) inventory fauna and flora (mangroves, birds, fish and benthic invertebrates, mammals, reptiles and others), iii) conduct a monitoring of naturally re-colonized areas, replanted areas and original forest on selected areas. Results show that natural recolonization of a mangrove area can be very quick under certain conditions (subject to availability of seeds and easy access to the area to be recolonized). But in areas where seeds cannot easily migrate and access, or where seed supply is too difficult, replanting remains the best option. Social aspects have also to be taken into account: replanting promote the local commitment to sustainable environmental conservation. This paper will detail the methodology, present the scientific results and discuss the lesson learned.
Published: 2014
Full Text: View/download PDF

31. Improvement of corrosion protection of steel by incorporation of a new phosphonated fatty acid in a phosphorus-containing polymer coating obtained by UV curing

Author: France Millet, Rémi Auvergne, Sylvain Caillol, Ghislain David, Abdelatif Manseri, Nadine Pébère, Centre National de la Recherche Scientifique - CNRS (FRANCE), Ecole Nationale Supérieure de Chimie de Montpellier - ENSCM (FRANCE), Institut National Polytechnique de Toulouse - Toulouse INP (FRANCE), Université Toulouse III - Paul Sabatier - UT3 (FRANCE), Université de Montpellier 1 (FRANCE), Université de Montpellier 2 (FRANCE), Centre interuniversitaire de recherche et d'ingenierie des matériaux (CIRIMAT), Centre National de la Recherche Scientifique (CNRS)-Université Toulouse III - Paul Sabatier (UT3), Université Fédérale Toulouse Midi-Pyrénées-Université Fédérale Toulouse Midi-Pyrénées-Institut National Polytechnique (Toulouse) (Toulouse INP), Université Fédérale Toulouse Midi-Pyrénées-Institut de Chimie du CNRS (INC), Institut Charles Gerhardt Montpellier - Institut de Chimie Moléculaire et des Matériaux de Montpellier (ICGM ICMMM), Ecole Nationale Supérieure de Chimie de Montpellier (ENSCM)-Centre National de la Recherche Scientifique (CNRS)-Université de Montpellier (UM)-Université Montpellier 1 (UM1)-Université Montpellier 2 - Sciences et Techniques (UM2)-Institut de Chimie du CNRS (INC), and Institut National Polytechnique de Toulouse - INPT (FRANCE)
Subjects: Materials science, Inhibitor, General Chemical Engineering, Matériaux, 02 engineering and technology, engineering.material, Phosphonated methacrylate, 010402 general chemistry, Methacrylate, 01 natural sciences, Corrosion, Coating, chemistry.chemical_compound, Materials Chemistry, Organic chemistry, Phosphonated fatty acid, Organic Chemistry, Substrate (chemistry), [CHIM.MATE]Chemical Sciences/Material chemistry, 021001 nanoscience & nanotechnology, 0104 chemical sciences, Surfaces, Coatings and Films, Dielectric spectroscopy, Oleic acid, Monomer, chemistry, Electrochemical impedance spectroscopya, UV curing, engineering, 0210 nano-technology, Nuclear chemistry
Abstract: International audience; tSix formulations containing diacrylate monomers (from 89 to 92.5% (w/w)) as well as a phosphonatedmethacrylate monomer (from 1 to 10% (w/w)) were prepared. All formulations were UV-cured and thecorrosion performance of the resulting coatings applied onto a steel substrate was assessed by elec-trochemical impedance spectroscopy (EIS). It was first shown that the coatings containing phosphonicacid methacrylate (MAPC1(OH)2) instead of methacrylate phosphonic dimethyl ester (MAPC1) presentedhigher corrosion protection related to the strong adhesive properties of phosphonic acid on the metalsubstrate. A minimum MAPC1(OH)2content of 2.5% was determined to provide the highest impedancevalues (best efficiency). Then, a new bio-based compound, i.e. phosphonic acid-bearing oleic acid (phos-phonated fatty acid), was synthesized and added as an inhibitor to the formulations. In the presence ofthis compound, the corrosion protection was notably improved. The beneficial effect of phosphonatedfatty acid was explained by its inhibitive action at the steel/coating interface and by the improvement ofthe barrier properties.
Published: 2014
Full Text: View/download PDF

32. An analytical model for azimuthal thermo-acoustic modes in annular chamber fed by an annular plenum

Author: Pablo Salas, Jean-François Parmentier, Michaël Bauerheim, Franck Nicoud, Thierry Poinsot, Centre Européen de Recherche et de Formation Avancée en Calcul Scientifique (CERFACS), Institut de mécanique des fluides de Toulouse (IMFT), Université Toulouse III - Paul Sabatier (UT3), Université de Toulouse (UT)-Université de Toulouse (UT)-Centre National de la Recherche Scientifique (CNRS)-Institut National Polytechnique (Toulouse) (Toulouse INP), Université de Toulouse (UT), High-End Parallel Algorithms for Challenging Numerical Simulations (HiePACS), Laboratoire Bordelais de Recherche en Informatique (LaBRI), Université de Bordeaux (UB)-École Nationale Supérieure d'Électronique, Informatique et Radiocommunications de Bordeaux (ENSEIRB)-Centre National de la Recherche Scientifique (CNRS)-Université de Bordeaux (UB)-École Nationale Supérieure d'Électronique, Informatique et Radiocommunications de Bordeaux (ENSEIRB)-Centre National de la Recherche Scientifique (CNRS)-Inria Bordeaux - Sud-Ouest, Institut National de Recherche en Informatique et en Automatique (Inria)-Institut National de Recherche en Informatique et en Automatique (Inria), Institut de Mathématiques et de Modélisation de Montpellier (I3M), Université Montpellier 2 - Sciences et Techniques (UM2)-Université de Montpellier (UM)-Centre National de la Recherche Scientifique (CNRS), Centre National de la Recherche Scientifique - CNRS (FRANCE), Institut National Polytechnique de Toulouse - INPT (FRANCE), Institut National de la Recherche en Informatique et en Automatique - INRIA (FRANCE), Université Toulouse III - Paul Sabatier - UT3 (FRANCE), Université de Montpellier 2 (FRANCE), CERFACS, Université Fédérale Toulouse Midi-Pyrénées-Université Fédérale Toulouse Midi-Pyrénées-Centre National de la Recherche Scientifique (CNRS)-Institut National Polytechnique (Toulouse) (Toulouse INP), Université Fédérale Toulouse Midi-Pyrénées, Université de Bordeaux (UB)-Centre National de la Recherche Scientifique (CNRS)-École Nationale Supérieure d'Électronique, Informatique et Radiocommunications de Bordeaux (ENSEIRB)-Université de Bordeaux (UB)-Centre National de la Recherche Scientifique (CNRS)-École Nationale Supérieure d'Électronique, Informatique et Radiocommunications de Bordeaux (ENSEIRB)-Inria Bordeaux - Sud-Ouest, Centre National de la Recherche Scientifique (CNRS)-Université Montpellier 2 - Sciences et Techniques (UM2)-Université de Montpellier (UM), and Institut National Polytechnique de Toulouse - Toulouse INP (FRANCE)
Subjects: General Chemical Engineering, Mécanique des fluides, General Physics and Astronomy, Energy Engineering and Power Technology, Combustion, combustion instabilities, Azimuthal modes, Transfer function, Analyse numérique, symbols.namesake, Coupling, Dispersion relation, coupling, Combustion instabilities, Bifurcation, Physics, [SPI.ACOU]Engineering Sciences [physics]/Acoustics [physics.class-ph], [SPI.FLUID]Engineering Sciences [physics]/Reactive fluid environment, General Chemistry, Mechanics, Analytical, Plenum space, [PHYS.MECA.ACOU]Physics [physics]/Mechanics [physics]/Acoustics [physics.class-ph], Fuel Technology, Amplitude, Helmholtz free energy, Combustor, symbols, analytical, azimuthal modes
Abstract: International audience; This study describes an analytical method to compute azimuthal modes due to ame/acoustics coupling in annular combustors. It is based on a quasi- one-dimensional zero-Mach number formulation where N burners are con- nected to an upstream annular plenum and a downstream chamber. Flames are supposed to be compact and are modeled using identical Flame Trans- fer Function for all burners, characterized by an amplitude and a phase shift. Manipulation of the corresponding acoustic equations leads to a sim- ple methodology called ANR (Annular Network Reduction). It allows to retain only the useful information related to the azimuthal modes of the annular cavities. It yields a simple dispersion relation which can be solved numerically and allows to construct coupling factors between the di erent cavities of the combustor. A fully analytical resolution can be performed in speci c situations where coupling factors are small (weak coupling). A bifurcation appears at high coupling factors leading to a frequency lock-in of the two annular cavities (strong coupling). This tool is applied to an aca- demic case where four burners connect an annular plenum to a chamber. For this con guration, analytical results are compared to a full three-dimensional Helmholtz solver to validate the analytical model in both weak and strong coupling regimes. Results show that this simple analytical tool allows to predict modes in annular combustors and investigate strategies to control them.
Published: 2014
Full Text: View/download PDF

33. Alignement d'ontologies : exploitation des ontologies liées sur le web de données

Author: Hecht, Thomas, Buche, Patrice, Dibie-Barthelemy, Juliette, Ibanescu, Liliana, Trojahn dos Santos, Cassia, Centre National de la Recherche Scientifique - CNRS (FRANCE), Institut National Polytechnique de Toulouse - INPT (FRANCE), Institut National de la Recherche Agronomique - INRA (FRANCE), Institut National de la Recherche en Informatique et en Automatique - INRIA (FRANCE), Université Toulouse III - Paul Sabatier - UT3 (FRANCE), Université Toulouse - Jean Jaurès - UT2J (FRANCE), Université Toulouse 1 Capitole - UT1 (FRANCE), Université de Montpellier 2 (FRANCE), Ingénierie des Agro-polymères et Technologies Émergentes (UMR IATE), Institut national d’études supérieures agronomiques de Montpellier (Montpellier SupAgro)-Centre de Coopération Internationale en Recherche Agronomique pour le Développement (Cirad)-Centre international d'études supérieures en sciences agronomiques (Montpellier SupAgro)-Université Montpellier 2 - Sciences et Techniques (UM2)-Université de Montpellier (UM)-Institut National de la Recherche Agronomique (INRA), Graphs for Inferences on Knowledge (GRAPHIK), Laboratoire d'Informatique de Robotique et de Microélectronique de Montpellier (LIRMM), Université de Montpellier (UM)-Centre National de la Recherche Scientifique (CNRS)-Université de Montpellier (UM)-Centre National de la Recherche Scientifique (CNRS)-Inria Sophia Antipolis - Méditerranée (CRISAM), Institut National de Recherche en Informatique et en Automatique (Inria)-Institut National de Recherche en Informatique et en Automatique (Inria), Méthodologies d'Analyse de Risque Alimentaire (MET@RISK), Institut National de la Recherche Agronomique (INRA), Institut de recherche en informatique de Toulouse (IRIT), Université Toulouse 1 Capitole (UT1)-Université Toulouse - Jean Jaurès (UT2J)-Université Toulouse III - Paul Sabatier (UT3), Université Fédérale Toulouse Midi-Pyrénées-Université Fédérale Toulouse Midi-Pyrénées-Centre National de la Recherche Scientifique (CNRS)-Institut National Polytechnique (Toulouse) (Toulouse INP), Université Fédérale Toulouse Midi-Pyrénées, Institut National Polytechnique de Toulouse - Toulouse INP (FRANCE), Centre de Coopération Internationale en Recherche Agronomique pour le Développement (Cirad)-Institut National de la Recherche Agronomique (INRA)-Université Montpellier 2 - Sciences et Techniques (UM2)-Centre international d'études supérieures en sciences agronomiques (Montpellier SupAgro)-Université de Montpellier (UM)-Institut national d’études supérieures agronomiques de Montpellier (Montpellier SupAgro), Institut national d'enseignement supérieur pour l'agriculture, l'alimentation et l'environnement (Institut Agro)-Institut national d'enseignement supérieur pour l'agriculture, l'alimentation et l'environnement (Institut Agro), Centre National de la Recherche Scientifique (CNRS)-Université de Montpellier (UM)-Centre National de la Recherche Scientifique (CNRS)-Université de Montpellier (UM)-Inria Sophia Antipolis - Méditerranée (CRISAM), MEthodes et ingénierie des Langues, des Ontologies et du DIscours (IRIT-MELODI), Université Toulouse 1 Capitole (UT1), Université Fédérale Toulouse Midi-Pyrénées-Université Fédérale Toulouse Midi-Pyrénées-Université Toulouse - Jean Jaurès (UT2J)-Université Toulouse III - Paul Sabatier (UT3), Université Fédérale Toulouse Midi-Pyrénées-Centre National de la Recherche Scientifique (CNRS)-Institut National Polytechnique (Toulouse) (Toulouse INP), Université Fédérale Toulouse Midi-Pyrénées-Université Toulouse 1 Capitole (UT1), Université Toulouse - Jean Jaurès (UT2J), Université Toulouse Capitole (UT Capitole), Université de Toulouse (UT)-Université de Toulouse (UT)-Université Toulouse - Jean Jaurès (UT2J), Université de Toulouse (UT)-Université Toulouse III - Paul Sabatier (UT3), Université de Toulouse (UT)-Centre National de la Recherche Scientifique (CNRS)-Institut National Polytechnique (Toulouse) (Toulouse INP), Université de Toulouse (UT)-Toulouse Mind & Brain Institut (TMBI), Université de Toulouse (UT)-Université de Toulouse (UT)-Université Toulouse III - Paul Sabatier (UT3), Université de Toulouse (UT)-Université Toulouse Capitole (UT Capitole), and Université de Toulouse (UT)
Subjects: Logique en informatique, NALT, [INFO.INFO-WB]Computer Science [cs]/Web, Ontologie, alignement d'ontologies, Informatique et langage, AGROVOC, Intelligence artificielle, Apprentissage, Web de données
Abstract: International audience; Nous proposons dans cet article une méthode d’alignement d’une ontologie source avec des ontologies cibles déjà publiées et liées sur le web de données. Nous présentons ensuite un retour d’expérience sur l’alignement d’une ontologie dans le domaine des sciences du vivant et de l’environnement avec AGROVOC et NALT.
Published: 2014

34. Mixed acoustic-entropy combustion instabilities in gas turbines

Author: Thierry Poinsot, Franck Nicoud, Emmanuel Motheau, Centre Européen de Recherche et de Formation Avancée en Calcul Scientifique (CERFACS), CERFACS, Institut de Mathématiques et de Modélisation de Montpellier (I3M), Centre National de la Recherche Scientifique (CNRS)-Université Montpellier 2 - Sciences et Techniques (UM2)-Université de Montpellier (UM), Institut de mécanique des fluides de Toulouse (IMFT), Université Toulouse III - Paul Sabatier (UT3), Université Fédérale Toulouse Midi-Pyrénées-Université Fédérale Toulouse Midi-Pyrénées-Centre National de la Recherche Scientifique (CNRS)-Institut National Polytechnique (Toulouse) (Toulouse INP), Université Fédérale Toulouse Midi-Pyrénées, Centre National de la Recherche Scientifique - CNRS (FRANCE), Institut National Polytechnique de Toulouse - INPT (FRANCE), Université Toulouse III - Paul Sabatier - UT3 (FRANCE), Université de Montpellier 2 (FRANCE), and Institut National Polytechnique de Toulouse - Toulouse INP (FRANCE)
Subjects: 020209 energy, Acoustics, Mécanique des fluides, Nozzle, Combustion, 02 engineering and technology, 01 natural sciences, Instability, 010305 fluids & plasmas, [SPI.MECA.MEFL]Engineering Sciences [physics]/Mechanics [physics.med-ph]/Fluids mechanics [physics.class-ph], Physics::Fluid Dynamics, symbols.namesake, 0103 physical sciences, 0202 electrical engineering, electronic engineering, information engineering, Dynamic mode decomposition, [PHYS.MECA.MEFL]Physics [physics]/Mechanics [physics]/Fluid mechanics [physics.class-ph], acoustics, reacting flows, Physics, Turbulence, Mechanical Engineering, [SPI.FLUID]Engineering Sciences [physics]/Reactive fluid environment, Reacting flows, Mechanics, Condensed Matter Physics, Mechanics of Materials, Helmholtz free energy, Combustor, symbols, Combustion chamber, Large eddy simulation, combustion
Abstract: A combustion instability in a combustor terminated by a nozzle is analysed and modelled based on a low-order Helmholtz solver. A large eddy simulation (LES) of the corresponding turbulent, compressible and reacting flow is first performed and analysed based on dynamic mode decomposition (DMD). The mode with the highest amplitude shares the same frequency of oscillation as the experiment (approximately 320 Hz) and shows the presence of large entropy spots generated within the combustion chamber and convected down to the exit nozzle. The lowest purely acoustic mode being in the range 700–750 Hz, it is postulated that the instability observed around 320 Hz stems from a mixed entropy–acoustic mode, where the acoustic generation associated with entropy spots being convected throughout the choked nozzle plays a key role. The DMD analysis allows one to extract from the LES results a low-order model that confirms that the mechanism of the low-frequency combustion instability indeed involves both acoustic and convected entropy waves. The delayed entropy coupled boundary condition (DECBC) (Motheau, Selle & Nicoud, J. Sound Vib., vol. 333, 2014, pp. 246–262) is implemented into a numerical Helmholtz solver where the baseline flow is assumed at rest. When fed with appropriate transfer functions to model the entropy generation and convection from the flame to the exit, the Helmholtz/DECBC solver predicts the presence of an unstable mode around 320 Hz, in agreement with both LES and experiments.
Published: 2014
Full Text: View/download PDF

35. Silicon carbide with tunable ordered mesoporosity

Author: Frédéric Favier, Patrice Simon, Pengcheng Gao, Institut Charles Gerhardt Montpellier - Institut de Chimie Moléculaire et des Matériaux de Montpellier (ICGM ICMMM), Université Montpellier 1 (UM1)-Université Montpellier 2 - Sciences et Techniques (UM2)-Ecole Nationale Supérieure de Chimie de Montpellier (ENSCM)-Institut de Chimie du CNRS (INC)-Centre National de la Recherche Scientifique (CNRS), Réseau sur le stockage électrochimique de l'énergie (RS2E), Université de Nantes (UN)-Aix Marseille Université (AMU)-Université de Haute-Alsace (UHA) Mulhouse - Colmar (Université de Haute-Alsace (UHA))-Collège de France (CdF (institution))-Université de Picardie Jules Verne (UPJV)-Ecole Nationale Supérieure de Chimie de Montpellier (ENSCM)-Ecole Nationale Supérieure de Chimie de Paris - Chimie ParisTech-PSL (ENSCP), Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL)-Université de Pau et des Pays de l'Adour (UPPA)-Institut de Chimie du CNRS (INC)-Université de Montpellier (UM)-Sorbonne Université (SU)-Centre National de la Recherche Scientifique (CNRS)-Institut National Polytechnique (Toulouse) (Toulouse INP), Université de Toulouse (UT)-Université de Toulouse (UT)-Institut polytechnique de Grenoble - Grenoble Institute of Technology (Grenoble INP ), Université Grenoble Alpes (UGA)-Université Grenoble Alpes (UGA), Centre interuniversitaire de recherche et d'ingenierie des matériaux (CIRIMAT), Université Toulouse III - Paul Sabatier (UT3), Université de Toulouse (UT)-Université de Toulouse (UT)-Institut de Chimie du CNRS (INC)-Centre National de la Recherche Scientifique (CNRS)-Institut National Polytechnique (Toulouse) (Toulouse INP), Université de Toulouse (UT), Université Montpellier 1 (UM1)-Université Montpellier 2 - Sciences et Techniques (UM2)-Ecole Nationale Supérieure de Chimie de Montpellier (ENSCM)-Institut de Chimie du CNRS (INC)-Université de Montpellier (UM)-Centre National de la Recherche Scientifique (CNRS), Université de Picardie Jules Verne (UPJV)-Institut de Chimie du CNRS (INC)-Aix Marseille Université (AMU)-Université de Pau et des Pays de l'Adour (UPPA)-Université de Nantes (UN)-Université de Montpellier (UM)-Centre National de la Recherche Scientifique (CNRS)-Sorbonne Université (SU)-Ecole Nationale Supérieure de Chimie de Paris - Chimie ParisTech-PSL (ENSCP), Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL)-Université de Haute-Alsace (UHA) Mulhouse - Colmar (Université de Haute-Alsace (UHA))-Collège de France (CdF (institution))-Institut polytechnique de Grenoble - Grenoble Institute of Technology (Grenoble INP ), Université Grenoble Alpes (UGA)-Université Grenoble Alpes (UGA)-Institut National Polytechnique (Toulouse) (Toulouse INP), Université Fédérale Toulouse Midi-Pyrénées-Université Fédérale Toulouse Midi-Pyrénées-Ecole Nationale Supérieure de Chimie de Montpellier (ENSCM), Centre National de la Recherche Scientifique (CNRS)-Université Toulouse III - Paul Sabatier (UT3), Université Fédérale Toulouse Midi-Pyrénées-Université Fédérale Toulouse Midi-Pyrénées-Institut National Polytechnique (Toulouse) (Toulouse INP), Université Fédérale Toulouse Midi-Pyrénées-Institut de Chimie du CNRS (INC), Centre National de la Recherche Scientifique - CNRS (FRANCE), Ecole Nationale Supérieure de Chimie de Montpellier - ENSCM (FRANCE), Institut National Polytechnique de Toulouse - Toulouse INP (FRANCE), Université Toulouse III - Paul Sabatier - UT3 (FRANCE), Université de Montpellier 1 (FRANCE), Université de Montpellier 2 (FRANCE), Réseau de stockage électrochimique de l’énergie - Energie RS2E (FRANCE), and Ecole Nationale Supérieure de Chimie de Montpellier (ENSCM)-Centre National de la Recherche Scientifique (CNRS)-Université de Montpellier (UM)-Université Montpellier 1 (UM1)-Université Montpellier 2 - Sciences et Techniques (UM2)-Institut de Chimie du CNRS (INC)
Subjects: Materials science, Silicon, SiC polytype, Mesoporous silicon carbide, Growth mechanism, Matériaux, Composite number, Tunable ordered structure, chemistry.chemical_element, Nanotechnology, 02 engineering and technology, Magnesio-thermal reduction, 010402 general chemistry, 01 natural sciences, Carbide, chemistry.chemical_compound, Silicon carbide, Copolymer, General Materials Science, ComputingMilieux_MISCELLANEOUS, General Chemistry, [CHIM.MATE]Chemical Sciences/Material chemistry, 021001 nanoscience & nanotechnology, Condensed Matter Physics, 0104 chemical sciences, chemistry, Chemical engineering, Mechanics of Materials, Homogeneous, 0210 nano-technology, Mesoporous material, Carbon
Abstract: International audience; Tunable mesoporous silicon carbides (SiCs) are synthesized by magnesio-thermal reduction of homogeneous composites of silica and carbon precursors. Two triblock copolymers, P123 and F127, are used as structuring agents leading to composites showing an hexagonal mesoporous pattern which is kept by the final SiC thanks to the relatively low temperature of the magnesio-thermal reduction. Two series of mesoporous SiCs are obtained with uniform pore sizes ranging from 6.0 nm to 2.5 nm (P123 used as structuring agent) and 11.0–3.5 nm (F127) depending on the carbon/silica molar ratio in the pristine composite. In each series, SiC polytype transforms from 6H–SiC to 3C–SiC in pace of increasing the carbon content in the composite precursor. A multi step growth mechanism is proposed to account for the composite precursor to final carbide characteristics.
Published: 2013
Full Text: View/download PDF

36. Altruism during predation in an assassin bug

Author: Messika Revel, Olivier Roux, Frédéric Azémar, Alain Dejean, AgroParisTech (FRANCE), Centre de Coopération Internationale en Recherche Agronomique - CIRAD (FRANCE), Centre National de la Recherche Scientifique - CNRS (FRANCE), Institut National Polytechnique de Toulouse - INPT (FRANCE), Institut National de la Recherche Agronomique - INRA (FRANCE), Institut National de la Recherche Scientifique - INRS (CANADA), Institut de Recherche pour le Développement - IRD (FRANCE), National Research Council of Canada (CANADA), Université Toulouse III - Paul Sabatier - UT3 (FRANCE), Université de Montpellier 1 (FRANCE), Université de Montpellier 2 (FRANCE), Université des Antilles et de la Guyane (FRANCE), Maladies infectieuses et vecteurs : écologie, génétique, évolution et contrôle - MIVEGEC (Bobo-Dioulasso, Burkina Faso), Institut National Polytechnique de Toulouse - Toulouse INP (FRANCE), Ecologie des forêts de Guyane (ECOFOG), Centre de Coopération Internationale en Recherche Agronomique pour le Développement (Cirad)-Institut National de la Recherche Agronomique (INRA)-Université des Antilles et de la Guyane (UAG)-AgroParisTech-Centre National de la Recherche Scientifique (CNRS), Laboratoire Ecologie Fonctionnelle et Environnement (ECOLAB), Centre National de la Recherche Scientifique (CNRS)-Observatoire Midi-Pyrénées (OMP), Météo France-Centre National d'Études Spatiales [Toulouse] (CNES)-Université Fédérale Toulouse Midi-Pyrénées-Centre National de la Recherche Scientifique (CNRS)-Institut de Recherche pour le Développement (IRD)-Météo France-Centre National d'Études Spatiales [Toulouse] (CNES)-Université Fédérale Toulouse Midi-Pyrénées-Centre National de la Recherche Scientifique (CNRS)-Institut de Recherche pour le Développement (IRD)-Institut National Polytechnique (Toulouse) (Toulouse INP), Université Fédérale Toulouse Midi-Pyrénées-Institut Ecologie et Environnement (INEE), Centre National de la Recherche Scientifique (CNRS)-Centre National de la Recherche Scientifique (CNRS)-Université Toulouse III - Paul Sabatier (UT3), Université Fédérale Toulouse Midi-Pyrénées, National Research Council of Canada (NRC), Institut National de la Recherche Scientifique [Québec] (INRS), Diversity, ecology, evolution & Adaptation of arthropod vectors (MIVEGEC-DEEVA), Evolution des Systèmes Vectoriels (ESV), Maladies infectieuses et vecteurs : écologie, génétique, évolution et contrôle (MIVEGEC), Institut de Recherche pour le Développement (IRD [France-Sud])-Centre National de la Recherche Scientifique (CNRS)-Université de Montpellier (UM)-Institut de Recherche pour le Développement (IRD [France-Sud])-Centre National de la Recherche Scientifique (CNRS)-Université de Montpellier (UM)-Maladies infectieuses et vecteurs : écologie, génétique, évolution et contrôle (MIVEGEC), Institut de Recherche pour le Développement (IRD [France-Sud])-Centre National de la Recherche Scientifique (CNRS)-Université de Montpellier (UM)-Institut de Recherche pour le Développement (IRD [France-Sud])-Centre National de la Recherche Scientifique (CNRS)-Université de Montpellier (UM), Agence Nationale de la Recherche (French Investissement d’Avenir grant, project Tri-Nutri) [CEBA, ANR-10-LABX-0025], European Community (programme Convergence 2007–2013 Région Guyane, project Bi-APPLI), Laboratoire Ecologie Fonctionnelle et Environnement (LEFE), Institut Ecologie et Environnement (INEE), Université de Toulouse (UT)-Université de Toulouse (UT)-Observatoire Midi-Pyrénées (OMP), Institut de Recherche pour le Développement (IRD)-Université Toulouse III - Paul Sabatier (UT3), Université de Toulouse (UT)-Université de Toulouse (UT)-Institut national des sciences de l'Univers (INSU - CNRS)-Centre National d'Études Spatiales [Toulouse] (CNES)-Centre National de la Recherche Scientifique (CNRS)-Météo-France -Institut de Recherche pour le Développement (IRD)-Institut national des sciences de l'Univers (INSU - CNRS)-Centre National d'Études Spatiales [Toulouse] (CNES)-Centre National de la Recherche Scientifique (CNRS)-Météo-France -Centre National de la Recherche Scientifique (CNRS)-Institut National Polytechnique (Toulouse) (Toulouse INP), Université de Toulouse (UT), Université de Montpellier (UM)-Centre National de la Recherche Scientifique (CNRS)-Institut de Recherche pour le Développement (IRD [France-Sud])-Université de Montpellier (UM)-Centre National de la Recherche Scientifique (CNRS)-Institut de Recherche pour le Développement (IRD [France-Sud])-Maladies infectieuses et vecteurs : écologie, génétique, évolution et contrôle (MIVEGEC), Université de Montpellier (UM)-Centre National de la Recherche Scientifique (CNRS)-Institut de Recherche pour le Développement (IRD [France-Sud])-Université de Montpellier (UM)-Centre National de la Recherche Scientifique (CNRS)-Institut de Recherche pour le Développement (IRD [France-Sud]), Université Toulouse III - Paul Sabatier (UT3), Université Fédérale Toulouse Midi-Pyrénées-Université Fédérale Toulouse Midi-Pyrénées-Observatoire Midi-Pyrénées (OMP), Université Fédérale Toulouse Midi-Pyrénées-Centre National de la Recherche Scientifique (CNRS)-Institut National Polytechnique (Toulouse) (Toulouse INP), Université de Montpellier (UM)-Centre National de la Recherche Scientifique (CNRS)-Institut de Recherche pour le Développement (IRD [France-Sud]), Institut de Recherche pour le Développement (IRD [France-Sud])-Centre National de la Recherche Scientifique (CNRS)-Université de Montpellier (UM), Université Fédérale Toulouse Midi-Pyrénées-Université Fédérale Toulouse Midi-Pyrénées-Institut Ecologie et Environnement (INEE), Centre National de la Recherche Scientifique (CNRS)-Centre National de la Recherche Scientifique (CNRS)-Institut National Polytechnique (Toulouse) (Toulouse INP), Université Fédérale Toulouse Midi-Pyrénées-Observatoire Midi-Pyrénées (OMP), and Météo France-Centre National d'Études Spatiales [Toulouse] (CNES)-Université Fédérale Toulouse Midi-Pyrénées-Centre National de la Recherche Scientifique (CNRS)-Institut de Recherche pour le Développement (IRD)-Météo France-Centre National d'Études Spatiales [Toulouse] (CNES)-Centre National de la Recherche Scientifique (CNRS)-Institut de Recherche pour le Développement (IRD)-Centre National de la Recherche Scientifique (CNRS)
Subjects: 0106 biological sciences, Nymph, Insecta, shelter, Prey detection, Predation, 010603 evolutionary biology, 01 natural sciences, conspecific, Drosera, Prey sharing, hunger, Zelus annulosus, Allomerus decemarticulatus, host plant, Conspecific tolerance, Animals, Body Size, Hirtella physophora, ant, Reduviidae, Social Behavior, Ecology, Evolution, Behavior and Systematics, [SDV.EE]Life Sciences [q-bio]/Ecology, environment, Ecologie, Environnement, biology, Ecology, Cannibalism, Hexapoda, Zelus, General Medicine, Assassin bug, biology.organism_classification, prey capture, cannibalism, prey size, 010602 entomology, altruism, Predatory Behavior, Instar, egg, insect, myrmecophyte, predation, feeding
Abstract: Zelus annulosus is an assassin bug species mostly noted on Hirtella physophora, a myrmecophyte specifically associated with the ant Allomerus decemarticulatus known to build traps on host tree twigs to ambush insect preys. The Z. annulosus females lay egg clutches protected by a sticky substance. To avoid being trapped, the first three instars of nymphs remain grouped in a clutch beneath the leaves on which they hatched, yet from time to time, they climb onto the upper side to group ambush preys. Long-distance prey detection permits these bugs to capture flying or jumping insects that alight on their leaves. Like some other Zelus species, the sticky substance of the sundew setae on their forelegs aids in prey capture. Group ambushing permits early instars to capture insects that they then share or not depending on prey size and the hunger of the successful nymphs. Fourth and fifth instars, with greater needs, rather ambush solitarily on different host tree leaves, but attract siblings to share large preys. Communal feeding permits faster prey consumption, enabling small nymphs to return sooner to the shelter of their leaves. By improving the regularity of feeding for each nymph, it likely regulates nymphal development, synchronizing molting and subsequently limiting cannibalism. © 2013 Springer-Verlag Berlin Heidelberg.
Published: 2013
Full Text: View/download PDF

37. Assessment of Digital Image Correlation Measurement Accuracy in the Ultimate Error Regime: Main Results of a Collaborative Benchmark

Author: Amiot, Fabien, Bornert, Michel, Doumalin, Pascal, Dupré, Jean-Christophe, Fazzini, Marina, Orteu, Jean-José, Poilane, Christophe, Robert, Laurent, Rotinat, René, Toussaint, Eveline, Wattrisse, Bertrand, Wienin, Jean-Samuel, Franche-Comté Électronique Mécanique, Thermique et Optique - Sciences et Technologies (UMR 6174) (FEMTO-ST), Université de Technologie de Belfort-Montbeliard (UTBM)-Ecole Nationale Supérieure de Mécanique et des Microtechniques (ENSMM)-Université de Franche-Comté (UFC), Université Bourgogne Franche-Comté [COMUE] (UBFC)-Université Bourgogne Franche-Comté [COMUE] (UBFC)-Centre National de la Recherche Scientifique (CNRS), Laboratoire Navier (navier umr 8205), Institut Français des Sciences et Technologies des Transports, de l'Aménagement et des Réseaux (IFSTTAR)-École des Ponts ParisTech (ENPC)-Centre National de la Recherche Scientifique (CNRS), Institut Pprime (PPRIME), ENSMA-Centre National de la Recherche Scientifique (CNRS)-Université de Poitiers, Laboratoire Génie de Production (LGP), Ecole Nationale d'Ingénieurs de Tarbes, Institut Clément Ader (ICA), Institut National des Sciences Appliquées - Toulouse (INSA Toulouse), Institut National des Sciences Appliquées (INSA)-Institut National des Sciences Appliquées (INSA)-Centre National de la Recherche Scientifique (CNRS)-Université Toulouse III - Paul Sabatier (UT3), Université Fédérale Toulouse Midi-Pyrénées-Université Fédérale Toulouse Midi-Pyrénées-IMT École nationale supérieure des Mines d'Albi-Carmaux (IMT Mines Albi), Institut Mines-Télécom [Paris] (IMT)-Institut Mines-Télécom [Paris] (IMT)-Institut Supérieur de l'Aéronautique et de l'Espace (ISAE-SUPAERO), Centre de recherche sur les Ions, les MAtériaux et la Photonique (CIMAP - UMR 6252), Université de Caen Normandie (UNICAEN), Normandie Université (NU)-Normandie Université (NU)-École Nationale Supérieure d'Ingénieurs de Caen (ENSICAEN), Normandie Université (NU)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Centre National de la Recherche Scientifique (CNRS), Mechanics surfaces and materials processing (MSMP), Arts et Métiers Sciences et Technologies, HESAM Université (HESAM)-HESAM Université (HESAM), Laboratoire de Mécanique et Ingénieries (LAMI), Institut Français de Mécanique Avancée (IFMA)-Université Blaise Pascal - Clermont-Ferrand 2 (UBP), ThermoMécanique des Matériaux (ThM2), Laboratoire de Mécanique et Génie Civil (LMGC), Université de Montpellier (UM)-Centre National de la Recherche Scientifique (CNRS)-Université de Montpellier (UM)-Centre National de la Recherche Scientifique (CNRS), Centre des Matériaux des Mines d'Alès (C2MA), IMT - MINES ALES (IMT - MINES ALES), Institut Mines-Télécom [Paris] (IMT)-Institut Mines-Télécom [Paris] (IMT), GDR CNRS 2519 'Mesures de Champs et Identification en Mécanique des Solides', Arts et Métiers ParisTech (FRANCE), Commissariat à l'Energie Atomique et aux énergies alternatives - CEA (FRANCE), Centre National de la Recherche Scientifique - CNRS (FRANCE), Ecole Nationale Supérieure d'Ingénieurs de Caen - ENSICAEN (FRANCE), Ecole Nationale Supérieure de Mécanique et d'Aérotechnique - ENSMA (FRANCE), Ecole Nationale Supérieure de Mécanique et des Microtechniques - ENSMM (FRANCE), Ecole nationale supérieure des Mines d'Albi-Carmaux - IMT Mines Albi (FRANCE), Institut Français des Sciences et Technologies des Transports, de l'Aménagement et des Réseaux - IFSTTAR (FRANCE), Institut National Polytechnique de Toulouse - INPT (FRANCE), Institut National des Sciences Appliquées de Toulouse - INSA (FRANCE), Institut Supérieur de l'Aéronautique et de l'Espace - ISAE-SUPAERO (FRANCE), Université Toulouse III - Paul Sabatier - UT3 (FRANCE), Université de Caen Basse-Normandie (FRANCE), Université Blaise Pascal - UBP (FRANCE), Université de Franche-Comté (FRANCE), Université de Montpellier 2 (FRANCE), Université de Poitiers (FRANCE), Université de Technologie de Belfort-Montbéliard - UTBM (FRANCE), IMT Mines Alès (FRANCE), Ecole des Ponts ParisTech (FRANCE), Institut français de mécanique avancée - IFMA (FRANCE), Institut de recherche sur les matériaux avancés - IRMA (FRANCE), Université du Maine (FRANCE), Université Paris-Est Marne-La-Vallée - UPEM (FRANCE), Université de Technologie de Belfort-Montbeliard (UTBM)-Ecole Nationale Supérieure de Mécanique et des Microtechniques (ENSMM)-Centre National de la Recherche Scientifique (CNRS)-Université de Franche-Comté (UFC), Université Bourgogne Franche-Comté [COMUE] (UBFC)-Université Bourgogne Franche-Comté [COMUE] (UBFC), Université de Poitiers-ENSMA-Centre National de la Recherche Scientifique (CNRS), Ecole Nationale d'Ingénieurs de Tarbes (ENIT), Institut National Polytechnique (Toulouse) (Toulouse INP), Université de Toulouse (UT)-Université de Toulouse (UT)-Institut National Polytechnique (Toulouse) (Toulouse INP), Université de Toulouse (UT)-Université de Toulouse (UT), Institut Supérieur de l'Aéronautique et de l'Espace (ISAE-SUPAERO)-Institut National des Sciences Appliquées - Toulouse (INSA Toulouse), Institut National des Sciences Appliquées (INSA)-Université de Toulouse (UT)-Institut National des Sciences Appliquées (INSA)-Université de Toulouse (UT)-Université Toulouse III - Paul Sabatier (UT3), Université de Toulouse (UT)-Centre National de la Recherche Scientifique (CNRS)-IMT École nationale supérieure des Mines d'Albi-Carmaux (IMT Mines Albi), Normandie Université (NU)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Centre National de la Recherche Scientifique (CNRS)-Institut de Recherche sur les Matériaux Avancés (IRMA), Normandie Université (NU)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université de Rouen Normandie (UNIROUEN), Normandie Université (NU)-Institut national des sciences appliquées Rouen Normandie (INSA Rouen Normandie), Institut National des Sciences Appliquées (INSA)-Normandie Université (NU)-Institut National des Sciences Appliquées (INSA)-Centre National de la Recherche Scientifique (CNRS)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université de Rouen Normandie (UNIROUEN), Institut National des Sciences Appliquées (INSA)-Normandie Université (NU)-Institut National des Sciences Appliquées (INSA)-Centre National de la Recherche Scientifique (CNRS), HESAM Université - Communauté d'universités et d'établissements Hautes écoles Sorbonne Arts et métiers université (HESAM)-HESAM Université - Communauté d'universités et d'établissements Hautes écoles Sorbonne Arts et métiers université (HESAM), ISAE-ENSMA Ecole Nationale Supérieure de Mécanique et d'Aérotechnique (FRANCE), and Institut National Polytechnique de Toulouse - Toulouse INP (FRANCE)
Subjects: Random error, Image matching, Mécanique [Sciences de l'ingénieur], Synthetic images, Systematic error, image matching, [SPI.MECA]Engineering Sciences [physics]/Mechanics [physics.med-ph], systematic error, synthetic images, Digital Image Correlation (DIC), [INFO.INFO-TS]Computer Science [cs]/Signal and Image Processing, Ingénierie assistée par ordinateur, random error, [SPI.SIGNAL]Engineering Sciences [physics]/Signal and Image processing, Traitement du signal et de l'image [Sciences de l'ingénieur]
Abstract: We report on the main results of a collaborative work devoted to the study of the uncertainties associated with Digital image correlation techniques (DIC). More specifically, the dependence of displacement measurement uncertainties with both image characteristics and DIC parameters is emphasised. A previous work [Bornert et al. (2009) Assessment of digital image correlation measurement errors: methodology and results. Exp. Mech. 49, 353–370] dedicated to situations with spatially fluctuating displacement fields demonstrated the existence of an ‘ultimate error’ regime, insensitive to the mismatch between the shape function and the real displacement field. The present work is focused on this ultimate error. To ensure that there is no mismatch error, synthetic images of in-plane rigid body translation have been analysed. Several DIC softwares developed by or in use in the French community have been used to explore the effects of a large number of settings. The discrepancies between DIC evaluated displacements and prescribed ones have been statistically analysed in terms of random errors and systematic bias, in correlation with the fractional part τ of the displacement component expressed in pixels. Main results are as follows: (i) bias amplitude is almost always insensitive to subset size, (ii) standard deviation of random error increases with noise level and decreases with subset size and (iii) DIC formulations can be split up into two main families regarding bias sensitivity to noise. For the first one, bias amplitude increases with noise while it remains nearly constant for the second one. In addition, for the first family, a strong dependence of random error with τ is observed for noisy images. GDR CNRS 2519 ‘Mesures de Champs et Identification en Mécanique des Solides’
Published: 2013
Full Text: View/download PDF

38. How to coexist with fire ants: The roles of behaviour and cuticular compounds

Author: Jean Michel Martin, Régis Céréghino, Arthur Compin, Olivier Roux, Vivien Rossi, Alain Dejean, Ecologie des forêts de Guyane (ECOFOG), Centre de Coopération Internationale en Recherche Agronomique pour le Développement (Cirad)-Institut National de la Recherche Agronomique (INRA)-Université des Antilles et de la Guyane (UAG)-AgroParisTech-Centre National de la Recherche Scientifique (CNRS), Maladies infectieuses et vecteurs : écologie, génétique, évolution et contrôle (MIVEGEC), Institut de Recherche pour le Développement (IRD [France-Sud])-Centre National de la Recherche Scientifique (CNRS)-Université de Montpellier (UM), Laboratoire Ecologie Fonctionnelle et Environnement (ECOLAB), Université Toulouse III - Paul Sabatier (UT3), Université Fédérale Toulouse Midi-Pyrénées-Université Fédérale Toulouse Midi-Pyrénées-Observatoire Midi-Pyrénées (OMP), Université Fédérale Toulouse Midi-Pyrénées-Centre National de la Recherche Scientifique (CNRS)-Institut National Polytechnique (Toulouse) (Toulouse INP), Université Fédérale Toulouse Midi-Pyrénées, Diversity, ecology, evolution & Adaptation of arthropod vectors (MIVEGEC-DEEVA), Evolution des Systèmes Vectoriels (ESV), Université de Montpellier (UM)-Centre National de la Recherche Scientifique (CNRS)-Institut de Recherche pour le Développement (IRD [France-Sud])-Université de Montpellier (UM)-Centre National de la Recherche Scientifique (CNRS)-Institut de Recherche pour le Développement (IRD [France-Sud])-Maladies infectieuses et vecteurs : écologie, génétique, évolution et contrôle (MIVEGEC), Université de Montpellier (UM)-Centre National de la Recherche Scientifique (CNRS)-Institut de Recherche pour le Développement (IRD [France-Sud])-Université de Montpellier (UM)-Centre National de la Recherche Scientifique (CNRS)-Institut de Recherche pour le Développement (IRD [France-Sud]), Université Fédérale Toulouse Midi-Pyrénées-Université Fédérale Toulouse Midi-Pyrénées-Institut Ecologie et Environnement (INEE), Centre National de la Recherche Scientifique (CNRS)-Centre National de la Recherche Scientifique (CNRS)-Institut National Polytechnique (Toulouse) (Toulouse INP), Université Fédérale Toulouse Midi-Pyrénées-Observatoire Midi-Pyrénées (OMP), Météo France-Centre National d'Études Spatiales [Toulouse] (CNES)-Université Fédérale Toulouse Midi-Pyrénées-Centre National de la Recherche Scientifique (CNRS)-Institut de Recherche pour le Développement (IRD)-Météo France-Centre National d'Études Spatiales [Toulouse] (CNES)-Centre National de la Recherche Scientifique (CNRS)-Institut de Recherche pour le Développement (IRD)-Centre National de la Recherche Scientifique (CNRS), French Fondation pour la Recherche sur la Biodiversité [AAP-IN-2009-050], Investissement d'Avenir grant from the French Agence Nationale de la Recherche (CEBA) [ANR-10-LABX-0025], AgroParisTech (FRANCE), Centre de Coopération Internationale en Recherche Agronomique - CIRAD (FRANCE), Centre National de la Recherche Scientifique - CNRS (FRANCE), Institut National Polytechnique de Toulouse - INPT (FRANCE), Institut National de la Recherche Agronomique - INRA (FRANCE), Institut de Recherche pour le Développement - IRD (FRANCE), Université Toulouse III - Paul Sabatier - UT3 (FRANCE), Université de Montpellier 1 (FRANCE), Université de Montpellier 2 (FRANCE), Université des Antilles et de la Guyane (FRANCE), Institut National Polytechnique de Toulouse - Toulouse INP (FRANCE), Centre National de la Recherche Scientifique (CNRS)-Observatoire Midi-Pyrénées (OMP), Météo France-Centre National d'Études Spatiales [Toulouse] (CNES)-Université Fédérale Toulouse Midi-Pyrénées-Centre National de la Recherche Scientifique (CNRS)-Institut de Recherche pour le Développement (IRD)-Météo France-Centre National d'Études Spatiales [Toulouse] (CNES)-Université Fédérale Toulouse Midi-Pyrénées-Centre National de la Recherche Scientifique (CNRS)-Institut de Recherche pour le Développement (IRD)-Institut National Polytechnique (Toulouse) (Toulouse INP), Université Fédérale Toulouse Midi-Pyrénées-Institut Ecologie et Environnement (INEE), Centre National de la Recherche Scientifique (CNRS)-Centre National de la Recherche Scientifique (CNRS)-Université Toulouse III - Paul Sabatier (UT3), Laboratoire Ecologie Fonctionnelle et Environnement (LEFE), Institut Ecologie et Environnement (INEE), Université de Toulouse (UT)-Université de Toulouse (UT)-Observatoire Midi-Pyrénées (OMP), Institut de Recherche pour le Développement (IRD)-Université Toulouse III - Paul Sabatier (UT3), Université de Toulouse (UT)-Université de Toulouse (UT)-Institut national des sciences de l'Univers (INSU - CNRS)-Centre National d'Études Spatiales [Toulouse] (CNES)-Centre National de la Recherche Scientifique (CNRS)-Météo-France -Institut de Recherche pour le Développement (IRD)-Institut national des sciences de l'Univers (INSU - CNRS)-Centre National d'Études Spatiales [Toulouse] (CNES)-Centre National de la Recherche Scientifique (CNRS)-Météo-France -Centre National de la Recherche Scientifique (CNRS)-Institut National Polytechnique (Toulouse) (Toulouse INP), and Université de Toulouse (UT)
Subjects: 0106 biological sciences, Dominance-Subordination, Fire ant, Injury control, Poison control, Territoriality, 010603 evolutionary biology, 01 natural sciences, Pheromones, Behavioral Neuroscience, Aggressiveness, Animals, Supercolonialitya, Eciton burchellii, Compétition biologique, Formicidae, Dear enemy phenomenon, Ecologie, Environnement, [SDV.EE]Life Sciences [q-bio]/Ecology, environment, Army ant, Nasty neighbour effect, biology, Ecology, Ants, Compétition animale, Species coexistence, General Medicine, Supercoloniality, biology.organism_classification, ANT, Aggression, 010602 entomology, Écologie animale, Animal Science and Zoology, L20 - Écologie animale, PEST analysis, Solenopsis, Cuticular hydrocarbons
Abstract: International audience; Because territoriality is energetically costly, territorial animals frequently respond less aggressively toneighbours than to strangers, a reaction known as the "dear enemy phenomenon" (DEP). The contrary,the "nasty neighbour effect" (NNE), occurs mainly for group-living species defending resource-basedterritories. We studied the relationships between supercolonies of the pest fire ant Solenopsis saevissimaand eight ant species able to live in the vicinity of its nests plus Eciton burchellii, an army ant predatorof other ants. The workers from all of the eight ant species behaved submissively when confrontedwith S. saevissima (dominant) individuals, whereas the contrary was never true. Yet, S. saevissima weresubmissive towards E. burchellii workers. Both DEP and NNE were observed for the eight ant species, withsubmissive behaviours less frequent in the case of DEP. To distinguish what is due to chemical cues fromwhat can be attributed to behaviour, we extracted cuticular compounds from all of the nine ant speciescompared and transferred them onto a number of S. saevissima workers that were then confronted withuntreated conspecifics. The cuticular compounds from three species, particularly E. burchellii, triggeredgreater aggressiveness by S. saevissima workers, while those from the other species did not.
Published: 2013
Full Text: View/download PDF

39. Analysis and modelling of entropy modes in a realistic aeronautical gas turbine

Author: Franck Nicoud, Yoann Mery, Emmanuel Motheau, Thierry Poinsot, Centre Européen de Recherche et de Formation Avancée en Calcul Scientifique (CERFACS), CERFACS, SNECMA Villaroche [Moissy-Cramayel], Safran Group, Institut de Mathématiques et de Modélisation de Montpellier (I3M), Centre National de la Recherche Scientifique (CNRS)-Université Montpellier 2 - Sciences et Techniques (UM2)-Université de Montpellier (UM), Institut de mécanique des fluides de Toulouse (IMFT), Université Toulouse III - Paul Sabatier (UT3), Université Fédérale Toulouse Midi-Pyrénées-Université Fédérale Toulouse Midi-Pyrénées-Centre National de la Recherche Scientifique (CNRS)-Institut National Polytechnique (Toulouse) (Toulouse INP), Université Fédérale Toulouse Midi-Pyrénées, Centre National d'Études Spatiales - CNES (FRANCE), Centre National de la Recherche Scientifique - CNRS (FRANCE), EDF (FRANCE), Institut National Polytechnique de Toulouse - Toulouse INP (FRANCE), Office National d'Etudes et Recherches Aérospatiales - ONERA (FRANCE), Total (FRANCE), Université Toulouse III - Paul Sabatier - UT3 (FRANCE), Université de Montpellier 2 (FRANCE), European Aeronautic Defence and Space company - EADS (FRANCE), Météo France (FRANCE), SAFRAN (FRANCE), and Institut de mathématiques et de modélisation de Montpellier - i3m (Montpellier, France)
Subjects: Flow (Dynamics), Mécanique des fluides, 020209 energy, Entropy, Combustion chambers, Energy Engineering and Power Technology, Aerospace Engineering, 02 engineering and technology, Convection, 01 natural sciences, 010305 fluids & plasmas, [SPI.MECA.MEFL]Engineering Sciences [physics]/Mechanics [physics.med-ph]/Fluids mechanics [physics.class-ph], Physics::Fluid Dynamics, Fluctuations (Physics), symbols.namesake, Transfer functions, 0103 physical sciences, 0202 electrical engineering, electronic engineering, information engineering, Dynamic mode decomposition, Entropy (information theory), Combustion instabilities, Physics, Mach number, Nozzles, Mechanical Engineering, [SPI.FLUID]Engineering Sciences [physics]/Reactive fluid environment, Modeling, Mechanics, Acoustics, Solver, [PHYS.MECA.ACOU]Physics [physics]/Mechanics [physics]/Acoustics [physics.class-ph], Fuel Technology, Classical mechanics, Turbomachinery, Nuclear Energy and Engineering, Helmholtz free energy, symbols, Combustor, Combustion chamber, Large eddy simulation, Gas turbines
Abstract: A combustion instability in a combustor typical of aero-engines is analyzed and modeled thanks to a low order Helmholtz solver. A dynamic mode decomposition (DMD) is first applied to the large eddy simulation (LES) database. The mode with the highest amplitude shares the same frequency of oscillation as the experiment (approximately 350 Hz) and it shows the presence of large entropy spots generated within the combustion chamber and convected down to the exit nozzle. With the lowest purely acoustic mode being in the range 650–700 Hz, it is postulated that the instability observed around 350 Hz stems from a mixed entropy/acoustic mode where the acoustic generation associated with the entropy spots being convected throughout the choked nozzle plays a key role. A delayed entropy coupled boundary condition is then derived in order to account for this interaction in the framework of a Helmholtz solver where the baseline flow is assumed to be at rest. When fed with the appropriate transfer functions to model the entropy generation and convection from the flame to the exit, the Helmholtz solver proves able to predict the presence of an unstable mode around 350 Hz, which is in agreement with both the LES and the experiments. This finding supports the idea that the instability observed in the combustor is indeed driven by the entropy/acoustic coupling.
Published: 2013
Full Text: View/download PDF

40. The open circuit potential of Geobacter sulfurreducens bioanodes depends on the electrochemical adaptation of the strain

Author: Benjamin Erable, Alain Bergel, Marie-Line Délia, Laurence Soussan, Laboratoire de génie chimique [ancien site de Basso-Cambo] (LGC), Université Toulouse III - Paul Sabatier (UT3), Université Fédérale Toulouse Midi-Pyrénées-Université Fédérale Toulouse Midi-Pyrénées-Centre National de la Recherche Scientifique (CNRS)-Institut National Polytechnique (Toulouse) (Toulouse INP), Université Fédérale Toulouse Midi-Pyrénées, Institut Européen des membranes (IEM), Centre National de la Recherche Scientifique (CNRS)-Ecole Nationale Supérieure de Chimie de Montpellier (ENSCM)-Université Montpellier 2 - Sciences et Techniques (UM2)-Institut de Chimie du CNRS (INC)-Université de Montpellier (UM), Centre National de la Recherche Scientifique - CNRS (FRANCE), Ecole Nationale Supérieure de Chimie de Montpellier - ENSCM (FRANCE), Institut National Polytechnique de Toulouse - Toulouse INP (FRANCE), Université Toulouse III - Paul Sabatier - UT3 (FRANCE), Université de Montpellier 2 (FRANCE), and Institut National Polytechnique de Toulouse - INPT (FRANCE)
Subjects: Polarization potential, Analytical chemistry, 02 engineering and technology, Applied potential, 010402 general chemistry, Electrochemistry, 01 natural sciences, lcsh:Chemistry, Physique Atomique, Polarization (electrochemistry), Geobacter sulfurreducens, biology, [PHYS.PHYS.PHYS-ATOM-PH]Physics [physics]/Physics [physics]/Atomic Physics [physics.atom-ph], Open-circuit voltage, Chemistry, 021001 nanoscience & nanotechnology, biology.organism_classification, 0104 chemical sciences, Microbial anode, [CHIM.THEO]Chemical Sciences/Theoretical and/or physical chemistry, lcsh:Industrial electrochemistry, lcsh:QD1-999, OCP, Electrocatalytic properties, 0210 nano-technology, Steady state current, Chimie théorique et/ou physique, lcsh:TP250-261
Abstract: Bioanodes for acetate oxidation were formed with pure cultures of Geobacter sulfurreducens under constant polarization potential. With the original commercial strain, the bioanodes formed at +0.2 V/SCE exhibited open circuit potential (OCP) of 0.0 V/SCE, while the bioanodes formed at −0.2 V/SCE had OCP around −0.52 V/SCE. In contrast, the bioanodes formed with bacterial cells collected from a previous current-producing bioanode exhibited OCP of −0.52 V/SCE whatever the polarization potential used to form them (+0.2 V/SCE or −0.2 V/SCE). The “electrochemically-adapted strain” kept its electrochemical characteristics after successive cultures in solution. High steady-state currents were reached (16–19 A m−2) in all cases without any dependence on strain adaptation or applied potential. Keywords: Geobacter sulfurreducens, Microbial anode, Polarization potential, OCP, Steady state current, Electrocatalytic properties
Published: 2013
Full Text: View/download PDF

41. The role of fluvial sediment supply and river-mouth hydrology in the dynamics of the muddy, Amazon-dominated Amapa-Guianas coast, South America: A three-point research agenda

Author: Antoine Gardel, Edward J. Anthony, Christophe Proisy, Romain Walcker, E. Gensac, Christina Péron, François Fromard, Sandric Lesourd, Aix-Marseille Université - AMU (FRANCE), Centre de Coopération Internationale en Recherche Agronomique - CIRAD (FRANCE), Centre National de la Recherche Scientifique - CNRS (FRANCE), Institut National Polytechnique de Toulouse - Toulouse INP (FRANCE), Institut National de la Recherche Agronomique - INRA (FRANCE), Institut de Recherche pour le Développement - IRD (FRANCE), Université du Littoral Côte d'Opale - ULCO (FRANCE), Université Toulouse III - Paul Sabatier - UT3 (FRANCE), Université de Montpellier 2 (FRANCE), Laboratoire d’Océanologie et de Géosciences (LOG) - UMR 8187 (LOG), Institut national des sciences de l'Univers (INSU - CNRS)-Université du Littoral Côte d'Opale (ULCO)-Université de Lille-Centre National de la Recherche Scientifique (CNRS)-Institut de Recherche pour le Développement (IRD [France-Nord]), Morphodynamique Continentale et Côtière (M2C), Université de Caen Normandie (UNICAEN), Normandie Université (NU)-Normandie Université (NU)-Institut national des sciences de l'Univers (INSU - CNRS)-Université de Rouen Normandie (UNIROUEN), Normandie Université (NU)-Centre National de la Recherche Scientifique (CNRS), Laboratoire d’Océanologie et de Géosciences (LOG) - UMR 8187 ( LOG ), Université du Littoral Côte d'Opale-Université de Lille-Centre National de la Recherche Scientifique ( CNRS ), Morphodynamique Continentale et Côtière ( M2C ), Centre National de la Recherche Scientifique ( CNRS ) -Université de Rouen Normandie ( UNIROUEN ), Normandie Université ( NU ) -Normandie Université ( NU ) -Institut national des sciences de l'Univers ( INSU - CNRS ) -Université de Caen Normandie ( UNICAEN ), Normandie Université ( NU ), Centre National de la Recherche Scientifique (CNRS)-Université du Littoral Côte d'Opale (ULCO)-Université de Lille-Institut national des sciences de l'Univers (INSU - CNRS), and Institut national des sciences de l'Univers (INSU - CNRS)-Université du Littoral Côte d'Opale (ULCO)-Université de Lille-Centre National de la Recherche Scientifique (CNRS)
Subjects: 010504 meteorology & atmospheric sciences, Mud banks, Drainage basin, 010502 geochemistry & geophysics, 01 natural sciences, Rivers, Human settlement, River mouth, River-mouth hydraulic groyne, 14. Life underwater, Sandy cheniers, Amazon, [SDU.STU.OC]Sciences of the Universe [physics]/Earth Sciences/Oceanography, 0105 earth and related environmental sciences, Earth-Surface Processes, Hydrology, [SDV.EE]Life Sciences [q-bio]/Ecology, environment, Ecologie, Environnement, geography, geography.geographical_feature_category, [ SDU.STU.OC ] Sciences of the Universe [physics]/Earth Sciences/Oceanography, Terrigenous sediment, Amazon rainforest, Geology, Estuary, 15. Life on land, Muddy coast, South America, Coring, Oceanography, Guiana Shield, 13. Climate action, Submarine pipeline
Abstract: International audience; The morphology and sediment dynamics of the 1500 km-long coast of South America between the mouths of the Amazon and the Orinoco Rivers are largely dependent on the massive suspended-sediment discharge of the Amazon, part of which is transported alongshore as mud banks. These mud banks have an overwhelming impact on the geology, the geomorphology, the ecology and the economy of this coast. Although numerous field investigations and remote sensing studies have considerably enhanced our understanding of the dynamics of this coast over the last three decades, much still remains to be understood of the unique functional mechanisms and processes driving its evolution. Among the themes that we deem as requiring further attention three come out as fundamental. The first concerns the mechanisms of formation of individual mud banks from mud streaming on the shelf off the mouth of the Amazon. An unknown quantity of the fluid mud generated by offshore estuarine front activity is transported shoreward and progressively forms mud banks on the Amapa coast, Brazil. The volume of each mud bank can contain from the equivalent of the annual mud supply of the Amazon to several times this annual sediment discharge. The mechanisms by which individual banks are generated from the Amazon turbidity maximum are still to be elucidated. Areas of research include regional mesoscale oceanographic conditions and mud supply from the Amazon. The second theme is that of variations in rates of migration of mud banks, which influence patterns of coastal accretion. Research emphasis needs to be placed on the analysis of both regional meteorological-hydrodynamic forcing and distant Atlantic forcing, as well as on the hydrology of the large rivers draining the Guyana Shield. The rivers appear to generate significant offshore deflection of mud banks in transit alongshore, through a hydraulic-groyne effect. This may favour both muddy accretion on the updrift coast and downdrift mud liquefaction with probably lessened muddy deposition. The third theme concerns sand supply by the Guiana Shield rivers. The rare sand deposits are important in providing sites for human settlements and routes and for nesting by marine turtles. The limited presence of sand bodies on this coast may reflect "mud blanketing", a hypothesis that requires verification through high-resolution seismic analyses of shelf deposits and coring operations. The large Guiana Shield rivers, especially in Surinam and Guyana, have supplied sand for the construction of significant bands of cheniers, probably enhanced by the afore-mentioned downdrift hydraulic-groyne effect on hindered mud deposition. In all the three themes of this future research agenda, two central elements are the sediment input of the rivers of the Amazon basin, starting with the massive mud supply from the Amazon catchment itself, followed by sand inputs by the Guiana Shield rivers and their river-mouth effects on mud banks.
Published: 2013
Full Text: View/download PDF

42. Middle Miocene vertebrates from the Amazonian Madre de Dios Subandean Zone, Perú

Author: Rodolfo Salas-Gismondi, Luc Lambs, Mélanie Louterbach, Martin Roddaz, Stéphanie Brichau, Stéphane Brusset, Pierre-Olivier Antoine, Ali J. Altamirano, Julia V. Tejada-Lara, Thierry Otto, Institut des Sciences de l'Evolution de Montpellier (UMR ISEM), Centre de Coopération Internationale en Recherche Agronomique pour le Développement (Cirad)-École Pratique des Hautes Études (EPHE), Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL)-Université de Montpellier (UM)-Institut de recherche pour le développement [IRD] : UR226-Centre National de la Recherche Scientifique (CNRS), Géosciences Environnement Toulouse (GET), Institut de Recherche pour le Développement (IRD)-Université Toulouse III - Paul Sabatier (UT3), Université de Toulouse (UT)-Université de Toulouse (UT)-Institut national des sciences de l'Univers (INSU - CNRS)-Observatoire Midi-Pyrénées (OMP), Université de Toulouse (UT)-Université de Toulouse (UT)-Institut national des sciences de l'Univers (INSU - CNRS)-Centre National d'Études Spatiales [Toulouse] (CNES)-Centre National de la Recherche Scientifique (CNRS)-Météo-France -Institut de Recherche pour le Développement (IRD)-Institut national des sciences de l'Univers (INSU - CNRS)-Centre National d'Études Spatiales [Toulouse] (CNES)-Centre National de la Recherche Scientifique (CNRS)-Météo-France -Centre National de la Recherche Scientifique (CNRS), Universidad Nacional Mayor de San Marcos (UNMSM), Institut Français d'Etudes Andines (IFEA), Ministère de l'Europe et des Affaires étrangères (MEAE)-Centre National de la Recherche Scientifique (CNRS), Institut Polytechnique LaSalle Beauvais, Laboratoire Ecologie Fonctionnelle et Environnement (LEFE), Institut Ecologie et Environnement (INEE), Centre National de la Recherche Scientifique (CNRS)-Centre National de la Recherche Scientifique (CNRS)-Université Toulouse III - Paul Sabatier (UT3), Université de Toulouse (UT)-Université de Toulouse (UT)-Observatoire Midi-Pyrénées (OMP), Université de Toulouse (UT)-Université de Toulouse (UT)-Institut national des sciences de l'Univers (INSU - CNRS)-Centre National d'Études Spatiales [Toulouse] (CNES)-Centre National de la Recherche Scientifique (CNRS)-Météo-France -Institut de Recherche pour le Développement (IRD)-Institut national des sciences de l'Univers (INSU - CNRS)-Centre National d'Études Spatiales [Toulouse] (CNES)-Centre National de la Recherche Scientifique (CNRS)-Météo-France -Centre National de la Recherche Scientifique (CNRS)-Institut National Polytechnique (Toulouse) (Toulouse INP), Université de Toulouse (UT), Centre de Coopération Internationale en Recherche Agronomique pour le Développement (Cirad)-École pratique des hautes études (EPHE), Institut national des sciences de l'Univers (INSU - CNRS)-Centre National de la Recherche Scientifique (CNRS)-Institut de Recherche pour le Développement (IRD)-Université Toulouse III - Paul Sabatier (UT3), Université Fédérale Toulouse Midi-Pyrénées-Université Fédérale Toulouse Midi-Pyrénées-Observatoire Midi-Pyrénées (OMP), Météo France-Centre National d'Études Spatiales [Toulouse] (CNES)-Université Fédérale Toulouse Midi-Pyrénées-Centre National de la Recherche Scientifique (CNRS)-Institut de Recherche pour le Développement (IRD)-Météo France-Centre National d'Études Spatiales [Toulouse] (CNES)-Centre National de la Recherche Scientifique (CNRS)-Institut de Recherche pour le Développement (IRD), Laboratoire Ecologie Fonctionnelle et Environnement (ECOLAB), Université Toulouse III - Paul Sabatier (UT3), Université Fédérale Toulouse Midi-Pyrénées-Université Fédérale Toulouse Midi-Pyrénées-Institut Ecologie et Environnement (INEE), Centre National de la Recherche Scientifique (CNRS)-Centre National de la Recherche Scientifique (CNRS)-Institut National Polytechnique (Toulouse) (Toulouse INP), Université Fédérale Toulouse Midi-Pyrénées-Observatoire Midi-Pyrénées (OMP), Météo France-Centre National d'Études Spatiales [Toulouse] (CNES)-Université Fédérale Toulouse Midi-Pyrénées-Centre National de la Recherche Scientifique (CNRS)-Institut de Recherche pour le Développement (IRD)-Météo France-Centre National d'Études Spatiales [Toulouse] (CNES)-Centre National de la Recherche Scientifique (CNRS)-Institut de Recherche pour le Développement (IRD)-Centre National de la Recherche Scientifique (CNRS), Centre National de la Recherche Scientifique - CNRS (FRANCE), Institut National Polytechnique de Toulouse - Toulouse INP (FRANCE), Institut de Recherche pour le Développement - IRD (FRANCE), Université Toulouse III - Paul Sabatier - UT3 (FRANCE), Université de Montpellier 2 (FRANCE), Institut Français d'Etudes Andines (PERU), Ministère des Affaires étrangères (FRANCE), Universidad Nacional Mayor de San Marcos - UNMSM (PERU), Institut Français d'Etudes Andines - IFEA (Lima, Peru), Laboratoire Ecologie fonctionnelle et Environnement - EcoLab (Toulouse, France), and Institut National Polytechnique de Toulouse - INPT (FRANCE)
Subjects: 0106 biological sciences, 010506 paleontology, Fission track age, Fauna, Amazonian, Biodiversité et Ecologie, Rodentia, Biochronology, 010603 evolutionary biology, 01 natural sciences, Paleontology, 0105 earth and related environmental sciences, Earth-Surface Processes, biology, Amazon rainforest, Ecology, Geology, 15. Life on land, biology.organism_classification, Dinomyidae, Marmosa, Marsupialia, Biogeography, Laventan, Colloncuran-early Laventan, [SDE.BE]Environmental Sciences/Biodiversity and Ecology, Tropical rainforest
Abstract: International audience; A new middle Miocene vertebrate fauna from Peruvian Amazonia is described. It yields the marsupials Sipalocyon sp. (Hathliacynidae) and Marmosa (Micoureus) cf. laventica (Didelphidae), as well as an unidentified glyptodontine xenarthran and the rodents Guiomys sp. (Caviidae), "Scleromys" sp., cf. quadrangulatus-schurmanni-colombianus (Dinomyidae), an unidentified acaremyid, and cf. Microsteiromys sp. (Erethizontidae). Apatite Fission Track provides a detrital age (17.1 +- 2.4 Ma) for the locality, slightly older than its inferred biochronological age (Colloncuran-early Laventan South American Land Mammal Ages: ~15.6e13.0 Ma). Put together, both the mammalian assemblage and lithology of the fossil-bearing level point to a mixture of tropical rainforest environment and more open habitats under a monsoonal-like tropical climate. The fully fluvial origin of the concerned sedimentary sequence suggests that the Amazonian Madre de Dios Subandean Zone was not part of the Pebas mega-wetland System by middle Miocene times. This new assemblage seems to reveal a previously undocumented "spatiotemporal transition" between the late early Miocene assemblages from high latitudes (Patagonia and Southern Chile) and the late middle Miocene faunas of low latitudes (Colombia, Perú, Venezuela, and ?Brazil).
Published: 2013
Full Text: View/download PDF

43. Mangrove microbial diversity and the impact of trophic contamination

Author: Luc Lambs, Marc Bouvy, Mélanie Herteman, Christophe Leboulanger, Cécile Chardon, Patrice Got, François Fromard, Agnès Bouchez, Philippe Cecchi, Noémie Pascault, Centre Alpin de Recherche sur les Réseaux Trophiques et Ecosystèmes Limniques (CARRTEL), Université Savoie Mont Blanc (USMB [Université de Savoie] [Université de Chambéry])-Institut National de la Recherche Agronomique (INRA), Ecologie des systèmes marins côtiers (Ecosym), Université Montpellier 1 (UM1)-Université Montpellier 2 - Sciences et Techniques (UM2)-Institut Français de Recherche pour l'Exploitation de la Mer (IFREMER)-Centre National de la Recherche Scientifique (CNRS), Gestion de l'Eau, Acteurs, Usages (UMR G-EAU), Centre de Coopération Internationale en Recherche Agronomique pour le Développement (Cirad)-Centre international d'études supérieures en sciences agronomiques (Montpellier SupAgro)-AgroParisTech-Institut national de recherche en sciences et technologies pour l'environnement et l'agriculture (IRSTEA)-Institut de Recherche pour le Développement (IRD [France-Sud]), Laboratoire Ecologie Fonctionnelle et Environnement (ECOLAB), Université Toulouse III - Paul Sabatier (UT3), Université Fédérale Toulouse Midi-Pyrénées-Université Fédérale Toulouse Midi-Pyrénées-Observatoire Midi-Pyrénées (OMP), Université Fédérale Toulouse Midi-Pyrénées-Centre National de la Recherche Scientifique (CNRS)-Institut National Polytechnique (Toulouse) (Toulouse INP), Université Fédérale Toulouse Midi-Pyrénées, Institut National de la Recherche Agronomique (INRA)-Université Savoie Mont Blanc (USMB [Université de Savoie] [Université de Chambéry]), Laboratoire Ecologie Fonctionnelle et Environnement (LEFE), Institut Ecologie et Environnement (INEE), Centre National de la Recherche Scientifique (CNRS)-Centre National de la Recherche Scientifique (CNRS)-Université Toulouse III - Paul Sabatier (UT3), Université de Toulouse (UT)-Université de Toulouse (UT)-Observatoire Midi-Pyrénées (OMP), Institut de Recherche pour le Développement (IRD)-Université Toulouse III - Paul Sabatier (UT3), Université de Toulouse (UT)-Université de Toulouse (UT)-Institut national des sciences de l'Univers (INSU - CNRS)-Centre National d'Études Spatiales [Toulouse] (CNES)-Centre National de la Recherche Scientifique (CNRS)-Météo-France -Institut de Recherche pour le Développement (IRD)-Institut national des sciences de l'Univers (INSU - CNRS)-Centre National d'Études Spatiales [Toulouse] (CNES)-Centre National de la Recherche Scientifique (CNRS)-Météo-France -Centre National de la Recherche Scientifique (CNRS)-Institut National Polytechnique (Toulouse) (Toulouse INP), Université de Toulouse (UT), French Ministry of Ecology, Energy, Sustainable Development, and Sea (MEEDDM) [CV070000783], French National Center for Scientific Research (CNRS), Institut Français de Recherche pour l'Exploitation de la Mer (IFREMER)-Université Montpellier 1 (UM1)-Université Montpellier 2 - Sciences et Techniques (UM2)-Centre National de la Recherche Scientifique (CNRS), Université Fédérale Toulouse Midi-Pyrénées-Université Fédérale Toulouse Midi-Pyrénées-Institut Ecologie et Environnement (INEE), Centre National de la Recherche Scientifique (CNRS)-Centre National de la Recherche Scientifique (CNRS)-Institut National Polytechnique (Toulouse) (Toulouse INP), Université Fédérale Toulouse Midi-Pyrénées-Observatoire Midi-Pyrénées (OMP), Météo France-Centre National d'Études Spatiales [Toulouse] (CNES)-Université Fédérale Toulouse Midi-Pyrénées-Centre National de la Recherche Scientifique (CNRS)-Institut de Recherche pour le Développement (IRD)-Météo France-Centre National d'Études Spatiales [Toulouse] (CNES)-Centre National de la Recherche Scientifique (CNRS)-Institut de Recherche pour le Développement (IRD)-Centre National de la Recherche Scientifique (CNRS), AgroParisTech (FRANCE), Centre International de Hautes Etudes Agronomiques Méditerranéennes - CIHEAM (FRANCE), Centre de Coopération Internationale en Recherche Agronomique - CIRAD (FRANCE), Centre National de la Recherche Scientifique - CNRS (FRANCE), Institut Français de Recherche pour l'Exploitation de la MER - IFREMER (FRANCE), Institut National Polytechnique de Toulouse - INPT (FRANCE), Institut National de la Recherche Agronomique - INRA (FRANCE), Institut national de Recherche en Sciences et Technologies pour l'Environnement et l'Agriculture - IRSTEA (FRANCE), Institut de Recherche pour le Développement - IRD (FRANCE), Montpellier SupAgro (FRANCE), Université Toulouse III - Paul Sabatier - UT3 (FRANCE), Université de Montpellier 1 (FRANCE), Université de Montpellier 2 (FRANCE), Institut national de recherche en sciences et technologies pour l’environnement et l’agriculture - CEMAGREF (FRANCE), Université de Savoie Mont Blanc - USMB (FRANCE), and Institut National Polytechnique de Toulouse - Toulouse INP (FRANCE)
Subjects: Geologic Sediments, Biodiversité et Ecologie, Biodiversity, Sewage, Wetland, BACTERIE, DIVERSITE SPECIFIQUE, Wastewater, 010501 environmental sciences, Oceanography, Waste Disposal, Fluid, 01 natural sciences, Chlorophyta, Nutrient load, Indian Ocean, ANALYSE STATISTIQUE, Trophic level, 0303 health sciences, geography.geographical_feature_category, Ecology, Biofilm, Phosphorus, Pollution, 6. Clean water, Biodegradation, Environmental, Mangrove, Water Microbiology, Food Chain, STRUCTURE DU PEUPLEMENT, Nitrogen, Microbial Consortia, Microbial communities, Aquatic Science, Biology, ABONDANCE, 03 medical and health sciences, Seawater, Ecosystem, 14. Life underwater, FLUORESCENCE, 0105 earth and related environmental sciences, Diatoms, geography, Bacteria, 030306 microbiology, business.industry, 15. Life on land, Microbial population biology, 13. Climate action, Wetlands, RELATION TROPHIQUE, Rhizophoraceae, [SDE.BE]Environmental Sciences/Biodiversity and Ecology, business, Water Pollutants, Chemical, Waste disposal
Abstract: International audience; Mangroves are threatened ecosystems that provide numerous ecosystem services, especially through their wide biodiversity, and their bioremediation capacity is a challenging question in tropical areas. In a mangrove in Mayotte, we studied the potential role of microbial biofilm communities in removing nutrient loads from pre-treated wastewater. Microbial community samples were collected from tree roots, sediments, water, and from a colonization device, and their structure and dynamics were compared in two areas: one exposed to sewage and the other not. The samples from the colonization devices accurately reflected the natural communities in terms of diversity. Communities in the zone exposed to sewage were characterized by more green algae and diatoms, higher bacteria densities, as well as different compositions. In the area exposed to sewage, the higher cell densities associated with specific diversity patterns highlighted adapted communities that may play a significant role in the fate of nutrients.
Published: 2013
Full Text: View/download PDF

44. Global Inverse Consistency for Interactive Constraint Satisfaction

Author: Christophe Lecoutre, Hélène Fargier, Christian Bessiere, Centre National de la Recherche Scientifique - CNRS (FRANCE), Institut National Polytechnique de Toulouse - Toulouse INP (FRANCE), Université Toulouse III - Paul Sabatier - UT3 (FRANCE), Université Toulouse - Jean Jaurès - UT2J (FRANCE), Université Toulouse 1 Capitole - UT1 (FRANCE), Université de Montpellier 2 (FRANCE), Université d'Artois (FRANCE), Agents, Apprentissage, Contraintes (COCONUT), Laboratoire d'Informatique de Robotique et de Microélectronique de Montpellier (LIRMM), Centre National de la Recherche Scientifique (CNRS)-Université de Montpellier (UM)-Centre National de la Recherche Scientifique (CNRS)-Université de Montpellier (UM), Argumentation, Décision, Raisonnement, Incertitude et Apprentissage (IRIT-ADRIA), Institut de recherche en informatique de Toulouse (IRIT), Université Toulouse 1 Capitole (UT1), Université Fédérale Toulouse Midi-Pyrénées-Université Fédérale Toulouse Midi-Pyrénées-Université Toulouse - Jean Jaurès (UT2J)-Université Toulouse III - Paul Sabatier (UT3), Université Fédérale Toulouse Midi-Pyrénées-Centre National de la Recherche Scientifique (CNRS)-Institut National Polytechnique (Toulouse) (Toulouse INP), Université Fédérale Toulouse Midi-Pyrénées-Université Toulouse 1 Capitole (UT1), Université Fédérale Toulouse Midi-Pyrénées, Centre National de la Recherche Scientifique (CNRS), Centre de Recherche en Informatique de Lens (CRIL), Université d'Artois (UA)-Centre National de la Recherche Scientifique (CNRS), and Institut National Polytechnique de Toulouse - INPT (FRANCE)
Subjects: Mathematical optimization, Tuples, 0102 computer and information sciences, 02 engineering and technology, 01 natural sciences, [INFO.INFO-CL]Computer Science [cs]/Computation and Language [cs.CL], [INFO.INFO-AI]Computer Science [cs]/Artificial Intelligence [cs.AI], Consistency (database systems), [INFO.INFO-LG]Computer Science [cs]/Machine Learning [cs.LG], 0202 electrical engineering, electronic engineering, information engineering, Influence diagram, Mathematics, Logique en informatique, Consistency model, [INFO.INFO-LO]Computer Science [cs]/Logic in Computer Science [cs.LO], Informatique et langage, Global inverse consistency, Constraint satisfaction, Resolution (logic), Intelligence artificielle, Apprentissage, Constraint (information theory), 010201 computation theory & mathematics, Local consistency, 020201 artificial intelligence & image processing, Tuple
Abstract: Some applications require the interactive resolution of a constraint problem by a human user. In such cases, it is highly desirable that the person who interactively solves the problem is not given the choice to select values that do not lead to solutions. We call this property global inverse consistency. Existing systems simulate this either by maintaining arc consistency after each assignment performed by the user or by compiling offline the problem as a multi-valued decision diagram. In this paper, we define several questions related to global inverse consistency and analyse their complexity. Despite their theoretical intractability, we propose several algorithms for enforcing global inverse consistency and we show that the best version is efficient enough to be used in an interactive setting on several configuration and design problems. We finally extend our contribution to the inverse consistency of tuples. This work has been funded by the ANR ("Agence Nationale de la Recherche") project BR4CP (ANR-11-BS02-008).
Published: 2013

45. Computing combustion noise by combining Large Eddy Simulation with analytical models for the propagation of waves through turbine blades

Author: Thierry Poinsot, Ignacio Duran, Franck Nicoud, Stéphane Moreau, Matthieu Leyko, Centre National de la Recherche Scientifique - CNRS (FRANCE), Institut National Polytechnique de Toulouse - INPT (FRANCE), Université Toulouse III - Paul Sabatier - UT3 (FRANCE), Université de Montpellier 2 (FRANCE), Université de Sherbrooke (CANADA), Institut de Mécanique des Fluides de Toulouse - IMFT (Toulouse, France), Centre Européen de Recherche et de Formation Avancée en Calcul Scientifique (CERFACS), CERFACS, SNECMA Villaroche [Moissy-Cramayel], Safran Group, GAUS, Université de Sherbrooke (UdeS), Institut de Mathématiques et de Modélisation de Montpellier (I3M), Centre National de la Recherche Scientifique (CNRS)-Université Montpellier 2 - Sciences et Techniques (UM2)-Université de Montpellier (UM), Institut de mécanique des fluides de Toulouse (IMFT), Université Toulouse III - Paul Sabatier (UT3), Université Fédérale Toulouse Midi-Pyrénées-Université Fédérale Toulouse Midi-Pyrénées-Centre National de la Recherche Scientifique (CNRS)-Institut National Polytechnique (Toulouse) (Toulouse INP), Université Fédérale Toulouse Midi-Pyrénées, and Institut National Polytechnique de Toulouse - Toulouse INP (FRANCE)
Subjects: Engineering, Turbine blade, 020209 energy, Strategy and Management, Acoustics, Mécanique des fluides, Indirect combustion noise, Combustion, 02 engineering and technology, 01 natural sciences, Turbine, law.invention, [SPI.MECA.MEFL]Engineering Sciences [physics]/Mechanics [physics.med-ph]/Fluids mechanics [physics.class-ph], Physics::Fluid Dynamics, law, 0103 physical sciences, 0202 electrical engineering, electronic engineering, information engineering, Media Technology, General Materials Science, [PHYS.MECA.MEFL]Physics [physics]/Mechanics [physics]/Fluid mechanics [physics.class-ph], 010301 acoustics, Marketing, [SPI.ACOU]Engineering Sciences [physics]/Acoustics [physics.class-ph], nozzle, business.industry, Large eddy simulation, Thermoacoustics, Acoustic wave, Solver, Vorticity, [PHYS.MECA.ACOU]Physics [physics]/Mechanics [physics]/Acoustics [physics.class-ph], Combustion chamber, business
Abstract: International audience; Two mechanisms control combustion noise generation as shown by Marble and Candel (1977) [1]: direct noise, in which acoustic waves propagate through the turbine stages and indirect noise, in which vorticity and/or entropy waves generate noise as they are convected through turbine stages. A method to calculate combustion-generated noise has been implemented in a tool called CHORUS. The method uses the large eddy simulations of the combustion chamber obtained with the unstructured solver AVBP developed at CERFACS (Schonfeld and Rudgyard, 1999 [2]) and analytical models for the propagation through turbine stages. The propagation models (Cumpsty and Marble, 1977 [3]) use the compact row hypothesis to write matching conditions between the inlet and the outlet of a turbine stage. Using numerical simulations, the validity of the analytical methods is studied and the errors made quantified.
Published: 2013
Full Text: View/download PDF

46. Using Boundary Conditions to Account for Mean Flow Effects in a Zero Mach Number Acoustic Solver

Author: Franck Nicoud, Emmanuel Motheau, Thierry Poinsot, Centre National de la Recherche Scientifique - CNRS (FRANCE), Institut National Polytechnique de Toulouse - Toulouse INP (FRANCE), Université Toulouse III - Paul Sabatier - UT3 (FRANCE), Université de Montpellier 2 (FRANCE), Centre Européen de Recherche et de Formation Avancée en Calcul Scientifique (CERFACS), CERFACS, Institut de Mathématiques et de Modélisation de Montpellier (I3M), Centre National de la Recherche Scientifique (CNRS)-Université Montpellier 2 - Sciences et Techniques (UM2)-Université de Montpellier (UM), Institut de mécanique des fluides de Toulouse (IMFT), Université Toulouse III - Paul Sabatier (UT3), Université Fédérale Toulouse Midi-Pyrénées-Université Fédérale Toulouse Midi-Pyrénées-Centre National de la Recherche Scientifique (CNRS)-Institut National Polytechnique (Toulouse) (Toulouse INP), and Université Fédérale Toulouse Midi-Pyrénées
Subjects: COMBUSTOR, Mécanique des fluides, 020209 energy, Energy Engineering and Power Technology, Aerospace Engineering, 02 engineering and technology, Mach wave, 01 natural sciences, NOISE, 010305 fluids & plasmas, symbols.namesake, INSTABILITIES, 0203 mechanical engineering, NOZZLES, 0103 physical sciences, 0202 electrical engineering, electronic engineering, information engineering, Entropy (information theory), Mean flow, [PHYS.MECA.MEFL]Physics [physics]/Mechanics [physics]/Fluid mechanics [physics.class-ph], Boundary value problem, Physics, 020301 aerospace & aeronautics, SOUND, [SPI.FLUID]Engineering Sciences [physics]/Reactive fluid environment, Mechanical Engineering, ENTROPY, Mechanics, Solver, [PHYS.MECA.ACOU]Physics [physics]/Mechanics [physics]/Acoustics [physics.class-ph], Fuel Technology, Classical mechanics, Acoustics mean flow boundary conditions, Nuclear Energy and Engineering, Mach number, symbols, Acoustic impedance, Gas compressor
Abstract: International audience; The present study is devoted to the modeling of mean flow effects while computing thermoacoustic modes under the zero Mach number assumption. It is first recalled that the acoustic impedance modelling a compressor or a turbine must be prescribed under an energetical form instead of the classical acoustic variables. Then we demonstrate the feasibility to take into account the coupling between acoustic and entropy waves in a zero Mach number framework to capture a family of low frequency entropic modes. The proposed approach relies on a new Delayed Entropy Coupled Boundary Condition (DECBC) and proves able to capture a family of Low frequency entropic mode even though no mean flow term is included into the fluctuating pressure equation.
Published: 2012
Full Text: View/download PDF

47. Isotopic values of the Amazon headwaters in Peru: comparison of the wet upper Río Madre de Dios watershed with the dry Urubamba-Apurimac river system

Author: Lambs, Luc, Horwath, Aline, Otto, Thierry, Julien, Frédéric, Antoine, Pierre-Olivier, Laboratoire Ecologie Fonctionnelle et Environnement (ECOLAB), Institut Ecologie et Environnement (INEE), Centre National de la Recherche Scientifique (CNRS)-Centre National de la Recherche Scientifique (CNRS)-Université Toulouse III - Paul Sabatier (UT3), Université Fédérale Toulouse Midi-Pyrénées-Université Fédérale Toulouse Midi-Pyrénées-Observatoire Midi-Pyrénées (OMP), Météo France-Centre National d'Études Spatiales [Toulouse] (CNES)-Université Fédérale Toulouse Midi-Pyrénées-Centre National de la Recherche Scientifique (CNRS)-Institut de Recherche pour le Développement (IRD)-Météo France-Centre National d'Études Spatiales [Toulouse] (CNES)-Centre National de la Recherche Scientifique (CNRS)-Institut de Recherche pour le Développement (IRD)-Centre National de la Recherche Scientifique (CNRS)-Institut National Polytechnique (Toulouse) (Toulouse INP), Université Fédérale Toulouse Midi-Pyrénées, Department of Plant Sciences (Cambridge, UK), University of Cambridge [UK] (CAM), Institut des Sciences de l'Evolution de Montpellier (UMR ISEM), École pratique des hautes études (EPHE), Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL)-Université de Montpellier (UM)-Centre de Coopération Internationale en Recherche Agronomique pour le Développement (Cirad)-Centre National de la Recherche Scientifique (CNRS)-Institut de recherche pour le développement [IRD] : UR226, Laboratoire Ecologie Fonctionnelle et Environnement (LEFE), Université de Toulouse (UT)-Université de Toulouse (UT)-Observatoire Midi-Pyrénées (OMP), Institut de Recherche pour le Développement (IRD)-Université Toulouse III - Paul Sabatier (UT3), Université de Toulouse (UT)-Université de Toulouse (UT)-Institut national des sciences de l'Univers (INSU - CNRS)-Centre National d'Études Spatiales [Toulouse] (CNES)-Centre National de la Recherche Scientifique (CNRS)-Météo-France -Institut de Recherche pour le Développement (IRD)-Institut national des sciences de l'Univers (INSU - CNRS)-Centre National d'Études Spatiales [Toulouse] (CNES)-Centre National de la Recherche Scientifique (CNRS)-Météo-France -Centre National de la Recherche Scientifique (CNRS)-Institut National Polytechnique (Toulouse) (Toulouse INP), Université de Toulouse (UT), Centre de Coopération Internationale en Recherche Agronomique pour le Développement (Cirad)-École Pratique des Hautes Études (EPHE), Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL)-Université de Montpellier (UM)-Institut de recherche pour le développement [IRD] : UR226-Centre National de la Recherche Scientifique (CNRS), Centre National de la Recherche Scientifique - CNRS (FRANCE), Institut National Polytechnique de Toulouse - Toulouse INP (FRANCE), Institut de Recherche pour le Développement - IRD (FRANCE), University of Cambridge (UNITED KINGDOM), Université Toulouse III - Paul Sabatier - UT3 (FRANCE), Université de Montpellier 2 (FRANCE), and Institut National Polytechnique de Toulouse - INPT (FRANCE)
Subjects: Ecologie, Environnement, [SDV.EE]Life Sciences [q-bio]/Ecology, environment, Rainforest, [SDE.MCG]Environmental Sciences/Global Changes, Amazon headwater, Milieux et Changements globaux, Water cycle
Abstract: International audience; RATIONALE: The Amazon River is a huge network of long tributaries, and little is known about the headwaters. Here we present a study of one wet tropical Amazon forest side, and one dry and cold Atiplano plateau, originating from the same cordillera. The aim is to see how this difference affects the water characteristics. METHODS: Different kind of water (spring, lake, river, rainfall) were sampled to determine their stable isotopes ratios (oxygen 18/16 and hydrogen 2/1) by continuous flow isotope ratio mass spectrometry (IRMS). These ratios coupled with chemical analysis enabled us to determine the origin of the water, the evaporation process and the water recycling over the Amazon plain forest and montane cloud forest. RESULTS: Our study shows that the water flowing in the upper Madre de Dios basin comes mainly from the foothill humid forest, with a characteristic water recycling process signature, and not from higher glacier melt. On the contrary, the water flowing in the Altiplano Rivers is mainly from glacier melts, with a high evaporation process. This snow and glacier are fed mainly by Atlantic moisture which transits over the large Amazon forest. CONCLUSIONS: The Atlantic moisture and its recycling over this huge tropical forest display a progressive isotopic gradient, as a function of distance from the ocean. At the level of the montane cloud forest and on the altiplano, respectively, additional water recycling and evaporation occur, but they are insignificant in the total water discharge.
Published: 2012
Full Text: View/download PDF

48. Milli-PIV rheology of shear-thinning fluids

Author: Sébastien Cazin, Philippe Tordjeman, Emmanuel Cid, Maxime Chinaud, Thomas Delaunay, Centre National de la Recherche Scientifique - CNRS (FRANCE), Institut National Polytechnique de Toulouse - Toulouse INP (FRANCE), Université Toulouse III - Paul Sabatier - UT3 (FRANCE), Université de Montpellier 2 (FRANCE), Institut de mécanique des fluides de Toulouse (IMFT), Université Toulouse III - Paul Sabatier (UT3), Université Fédérale Toulouse Midi-Pyrénées-Université Fédérale Toulouse Midi-Pyrénées-Centre National de la Recherche Scientifique (CNRS)-Institut National Polytechnique (Toulouse) (Toulouse INP), Université Fédérale Toulouse Midi-Pyrénées, Institut d’Electronique et des Systèmes (IES), Université de Montpellier (UM)-Centre National de la Recherche Scientifique (CNRS), Matériaux, MicroCapteurs et Acoustique (M2A), Université de Montpellier (UM)-Centre National de la Recherche Scientifique (CNRS)-Université de Montpellier (UM)-Centre National de la Recherche Scientifique (CNRS), and Institut National Polytechnique de Toulouse - INPT (FRANCE)
Subjects: Materials science, General Chemical Engineering, Mécanique des fluides, Shear thinning fluids, 01 natural sciences, [SPI.MECA.MEFL]Engineering Sciences [physics]/Mechanics [physics.med-ph]/Fluids mechanics [physics.class-ph], 010305 fluids & plasmas, law.invention, Optics, Rheology, Velocity profile, law, 0103 physical sciences, Perpendicular, General Materials Science, Milli-PIV, [PHYS.MECA.MEFL]Physics [physics]/Mechanics [physics]/Fluid mechanics [physics.class-ph], 010306 general physics, Pressure gradient, Complex fluid, Shear thinning, business.industry, Applied Mathematics, Mechanical Engineering, Mechanics, Velocimetry, Hele-Shaw cell, Condensed Matter Physics, Laser, Hele-Shaw flow, business
Abstract: International audience; Milli-Particle Image Velocimetry (Milli-PIV), which is an application of the standard PIV has been developed to measure the velocity distribution of complex fluids in a millimetric Hele-Shaw cell. A laser sheet is sent perpendicularly to the cell and the camera observes the PIV images via an internal optical prism. We studied, with Milli-PIV, a structural series of shear thinning xanthan fluids at different injection rates. We determined the velocity profiles in the thickness of the flow cell and discussed the accuracy of measurement. Using an inverse method, we calculated the constitutive parameters and showed that they are similar to those measured by rheology. The pressure gradient characteristic of the couple experimental conditions - fluid were also calculated from modeling the velocity profile.
Published: 2012
Full Text: View/download PDF

49. Thick collagen-based 3D matrices including growth factors to induce neurite outgrowth

Author: Jean-Marie Devoisselle, Frédérique Cunin, Jean-Michel Verdier, Anne Marcilhac, Emmanuel Belamie, Marie-Noëlle Labour, Amélie Banc, Audrey Tourrette, Institut Charles Gerhardt Montpellier - Institut de Chimie Moléculaire et des Matériaux de Montpellier (ICGM ICMMM), Université Montpellier 1 (UM1)-Université Montpellier 2 - Sciences et Techniques (UM2)-Ecole Nationale Supérieure de Chimie de Montpellier (ENSCM)-Institut de Chimie du CNRS (INC)-Centre National de la Recherche Scientifique (CNRS), Mécanismes moléculaires dans les démences neurodégénératives (MMDN), Université Montpellier 2 - Sciences et Techniques (UM2)-École pratique des hautes études (EPHE), Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL)-Institut National de la Santé et de la Recherche Médicale (INSERM), Laboratoire Charles Coulomb (L2C), Université de Montpellier (UM)-Centre National de la Recherche Scientifique (CNRS), BANC, Amélie, Centre National de la Recherche Scientifique - CNRS (FRANCE), Ecole Nationale Supérieure de Chimie de Montpellier - ENSCM (FRANCE), Institut National Polytechnique de Toulouse - INPT (FRANCE), Institut National de la Santé et de la Recherche Médicale - INSERM (FRANCE), Université Toulouse III - Paul Sabatier - UT3 (FRANCE), Université de Montpellier 2 (FRANCE), Ecole Pratique des Hautes Etudes - EPHE (FRANCE), Ecole Nationale Supérieure de Chimie de Montpellier (ENSCM)-Centre National de la Recherche Scientifique (CNRS)-Université de Montpellier (UM)-Université Montpellier 1 (UM1)-Université Montpellier 2 - Sciences et Techniques (UM2)-Institut de Chimie du CNRS (INC), Université de Montpellier (UM)-Université Montpellier 2 - Sciences et Techniques (UM2)-Institut National de la Santé et de la Recherche Médicale (INSERM)-École pratique des hautes études (EPHE), Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL), and Institut National Polytechnique de Toulouse - Toulouse INP (FRANCE)
Subjects: medicine.medical_treatment, [SDV.BC.IC] Life Sciences [q-bio]/Cellular Biology/Cell Behavior [q-bio.CB], Biochemistry, law.invention, Coupling, 0302 clinical medicine, Neurotrophic factors, law, [SDV.BC.IC]Life Sciences [q-bio]/Cellular Biology/Cell Behavior [q-bio.CB], Cell Behavior (q-bio.CB), Neural cell, 0303 health sciences, Microscopy, Confocal, biology, Neurite outgrowth, General Medicine, Growth factor, [CHIM.MATE]Chemical Sciences/Material chemistry, Intercellular Signaling Peptides and Proteins, Collagen, Biotechnology, Neurotrophin, Materials science, Neurite, Matériaux, 3D scaffold, Biomedical Engineering, Fibril, Cell Line, Biomaterials, 03 medical and health sciences, Confocal microscopy, medicine, Neurites, Animals, Humans, Molecular Biology, 030304 developmental biology, [CHIM.MATE] Chemical Sciences/Material chemistry, Rats, Compartmentation, Nerve growth factor, Micro et nanotechnologies/Microélectronique, FOS: Biological sciences, Biophysics, biology.protein, Microscopy, Electron, Scanning, Quantitative Biology - Cell Behavior, 030217 neurology & neurosurgery, Biomedical engineering
Abstract: Designing synthetic microenvironments for cellular investigations is a very active area of research at the crossroads of cell biology and materials science. The present work describes the design and functionalization of a three-dimensional (3D) culture support dedicated to the study of neurite outgrowth from neural cells. It is based on a dense self-assembled collagen matrix stabilized by 100-nm-wide interconnected native fibrils without chemical crosslinking. The matrices were made suitable for cell manipulation and direct observation in confocal microscopy by anchoring them to traditional glass supports with a calibrated thickness of similar to 50 mu m. The matrix composition can be readily adapted to specific neural cell types, notably by incorporating appropriate neurotrophic growth factors. Both PC-12 and SH-SY5Y lines respond to growth factors (nerve growth factor and brain-derived neurotrophic factor, respectively) impregnated and slowly released from the support. Significant neurite outgrowth is reported for a large proportion of cells, up to 66% for PC12 and 49% for SH-SY5Y. It is also shown that both growth factors can be chemically conjugated (EDC/NHS) throughout the matrix and yield similar proportions of cells with longer neurites (61% and 52%, respectively). Finally, neurite outgrowth was observed over several tens of microns within the 3D matrix, with both diffusing and immobilized growth factors. (C) 2012 Acta Materialia Inc. Published by Elsevier Ltd. All rights reserved.
Published: 2012
Full Text: View/download PDF

50. A simple analytical model to study and control azimuthal instabilities in annular combustion chambers

Author: Thierry Poinsot, Pierre Wolf, Pablo Salas, Gabriel Staffelbach, Jean-François Parmentier, Franck Nicoud, Centre Européen de Recherche et de Formation Avancée en Calcul Scientifique (CERFACS), CERFACS, High-End Parallel Algorithms for Challenging Numerical Simulations (HiePACS), Laboratoire Bordelais de Recherche en Informatique (LaBRI), Université de Bordeaux (UB)-Centre National de la Recherche Scientifique (CNRS)-École Nationale Supérieure d'Électronique, Informatique et Radiocommunications de Bordeaux (ENSEIRB)-Université de Bordeaux (UB)-Centre National de la Recherche Scientifique (CNRS)-École Nationale Supérieure d'Électronique, Informatique et Radiocommunications de Bordeaux (ENSEIRB)-Inria Bordeaux - Sud-Ouest, Institut National de Recherche en Informatique et en Automatique (Inria)-Institut National de Recherche en Informatique et en Automatique (Inria), Institut de Mathématiques et de Modélisation de Montpellier (I3M), Centre National de la Recherche Scientifique (CNRS)-Université Montpellier 2 - Sciences et Techniques (UM2)-Université de Montpellier (UM), Institut de mécanique des fluides de Toulouse (IMFT), Université Toulouse III - Paul Sabatier (UT3), Université Fédérale Toulouse Midi-Pyrénées-Université Fédérale Toulouse Midi-Pyrénées-Centre National de la Recherche Scientifique (CNRS)-Institut National Polytechnique (Toulouse) (Toulouse INP), Université Fédérale Toulouse Midi-Pyrénées, Centre National de la Recherche Scientifique - CNRS (FRANCE), Institut National Polytechnique de Toulouse - INPT (FRANCE), Université Toulouse III - Paul Sabatier - UT3 (FRANCE), Université de Montpellier 2 (FRANCE), Université de Bordeaux (UB)-École Nationale Supérieure d'Électronique, Informatique et Radiocommunications de Bordeaux (ENSEIRB)-Centre National de la Recherche Scientifique (CNRS)-Université de Bordeaux (UB)-École Nationale Supérieure d'Électronique, Informatique et Radiocommunications de Bordeaux (ENSEIRB)-Centre National de la Recherche Scientifique (CNRS)-Inria Bordeaux - Sud-Ouest, Université Montpellier 2 - Sciences et Techniques (UM2)-Université de Montpellier (UM)-Centre National de la Recherche Scientifique (CNRS), Université de Toulouse (UT)-Université de Toulouse (UT)-Centre National de la Recherche Scientifique (CNRS)-Institut National Polytechnique (Toulouse) (Toulouse INP), Université de Toulouse (UT), and Institut National Polytechnique de Toulouse - Toulouse INP (FRANCE)
Subjects: 020209 energy, General Chemical Engineering, Mécanique des fluides, General Physics and Astronomy, Energy Engineering and Power Technology, 02 engineering and technology, Azimuthal modes, 01 natural sciences, Transfer function, 010305 fluids & plasmas, symbols.namesake, Optics, Dispersion relation, 0103 physical sciences, 0202 electrical engineering, electronic engineering, information engineering, Physics::Chemical Physics, Combustion instabilities, Physics, [SPI.ACOU]Engineering Sciences [physics]/Acoustics [physics.class-ph], business.industry, [SPI.FLUID]Engineering Sciences [physics]/Reactive fluid environment, General Chemistry, Mechanics, Analytical, [PHYS.MECA.ACOU]Physics [physics]/Mechanics [physics]/Acoustics [physics.class-ph], Azimuth, Fuel Technology, Mach number, Helmholtz free energy, symbols, Combustor, Combustion chamber, business, Large eddy simulation
Abstract: International audience; This study describes a simple analytical method to compute the azimuthal modes appearing in annular combustion chambers and help analyzing experimental, acoustic and large eddy simulation (LES) data obtained in these combustion chambers. It is based on a one-dimensional zero Mach number formulation where N burners are connected to a single annular chamber. A manipulation of the corresponding acoustic equations in this configuration leads to a simple dispersion relation which can be solved by hand when the interaction indices of the flame transfer function are small and numerically when they are not. This simple tool is applied to multiple cases: (1) a single burner connected to an annular chamber (N = 1), (2) two burners connected to the chamber (N = 2), and (3) four burners (N = 4). In this case, the tool also allows to study passive control methods where two different types of burners are mixed to control the azimuthal mode. Finally, a complete helicopter chamber (N = 15) is studied. For all cases, the analytical results are compared to the predictions of a full three-dimensional Helmholtz solver and a very good agreement is found. These results show that building very simple analytical tools to study azimuthal modes in annular chambers is an interesting path to control them.
Published: 2012
Full Text: View/download PDF

Catalog

Books, media, physical & digital resources

See catalog results

Searchworks

Select search scope, currently: Articles Catalog books, media & more in Jio Institute collections Articles journal articles & other e-resources

Search

Search Constraints

Refine your results

Search Limiters

Topic

Publication Year Range

Language

Publication Type

Journal

Region

Database

Publisher

119 results on '"Université de Montpellier 2 (FRANCE)"'

Search Results

Catalog

Select search scope, currently: Articles

Catalog

books, media & more in Jio Institute collections

Articles

journal articles & other e-resources