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971 results on '"Université d'Orléans (UO)"'

1. Revealing the iron skeleton of Notre-Dame de Paris. Methodologies and issues of archaeological and analytical investigations following the blaze

Author

Maxime L'Héritier, Aurélia Azéma, Delphine Syvilay, Delphine Neff, Ivan Guillot, Emmanuelle Delqué-Kolic, Thibault Creacheadec, Philippe Dillmann, Archéologies et Sciences de l'Antiquité (ArScAn), Université Paris 1 Panthéon-Sorbonne (UP1)-Université Paris 8 Vincennes-Saint-Denis (UP8)-Université Paris Nanterre (UPN)-Ministère de la Culture et de la Communication (MCC)-Centre National de la Recherche Scientifique (CNRS), Université Paris 8 Vincennes-Saint-Denis (UP8), Archéologie de la Gaule : structures économiques et sociales (GAMA), Université Paris 1 Panthéon-Sorbonne (UP1)-Université Paris 8 Vincennes-Saint-Denis (UP8)-Université Paris Nanterre (UPN)-Ministère de la Culture et de la Communication (MCC)-Centre National de la Recherche Scientifique (CNRS)-Université Paris 1 Panthéon-Sorbonne (UP1)-Université Paris 8 Vincennes-Saint-Denis (UP8)-Université Paris Nanterre (UPN)-Ministère de la Culture et de la Communication (MCC)-Centre National de la Recherche Scientifique (CNRS), Laboratoire de recherche des monuments historiques (LRMH), Centre de Recherche sur la Conservation (CRC ), Muséum national d'Histoire naturelle (MNHN)-Ministère de la Culture et de la Communication (MCC)-Centre National de la Recherche Scientifique (CNRS)-Muséum national d'Histoire naturelle (MNHN)-Ministère de la Culture et de la Communication (MCC)-Centre National de la Recherche Scientifique (CNRS), IRAMAT - Laboratoire Archéomatériaux et Prévision de l'Altération (IRAMAT-LAPA), Institut de Recherche sur les Archéomatériaux (IRAMAT), Université de Technologie de Belfort-Montbeliard (UTBM)-Université d'Orléans (UO)-Université Paris-Saclay-Centre National de la Recherche Scientifique (CNRS)-Université de Technologie de Belfort-Montbeliard (UTBM)-Université d'Orléans (UO)-Université Paris-Saclay-Centre National de la Recherche Scientifique (CNRS), Nanosciences et Innovation pour les Matériaux, la Biomédecine et l'Energie (ex SIS2M) (NIMBE UMR 3685), Institut Rayonnement Matière de Saclay (IRAMIS), Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université Paris-Saclay-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université Paris-Saclay-Institut de Chimie du CNRS (INC)-Centre National de la Recherche Scientifique (CNRS), Institut de Chimie et des Matériaux Paris-Est (ICMPE), Institut de Chimie du CNRS (INC)-Université Paris-Est Créteil Val-de-Marne - Paris 12 (UPEC UP12)-Centre National de la Recherche Scientifique (CNRS), Laboratoire des Sciences du Climat et de l'Environnement [Gif-sur-Yvette] (LSCE), Université de Versailles Saint-Quentin-en-Yvelines (UVSQ)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Institut national des sciences de l'Univers (INSU - CNRS)-Université Paris-Saclay-Centre National de la Recherche Scientifique (CNRS), Laboratoire de mesure du carbone 14 (LMC14 - UMS 2572), and Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Institut de Radioprotection et de Sûreté Nucléaire (IRSN)-Ministère de la Culture et de la Communication (MCC)-Centre National de la Recherche Scientifique (CNRS)

Subjects
Archeology, [SDU]Sciences of the Universe [physics], Chemistry (miscellaneous), Materials Science (miscellaneous), Conservation, General Economics, Econometrics and Finance, Spectroscopy
Abstract

International audience

Published
2023

2. Thermosphere and satellite drag

Author

Sean Bruinsma, Thierry Dudok de Wit, Tim Fuller-Rowell, Katherine Garcia-Sage, Piyush Mehta, Fabian Schiemenz, Yuri Y. Shprits, Ruggero Vasile, Jia Yue, Sean Elvidge, 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), Laboratoire de Physique et Chimie de l'Environnement et de l'Espace (LPC2E), 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)-Centre National d’Études Spatiales [Paris] (CNES), International Space Science Institute [Bern] (ISSI), NOAA Space Weather Prediction Center (SWPC), National Oceanic and Atmospheric Administration (NOAA), NASA Goddard Space Flight Center (GSFC), West Virginia University [Morgantown], Airbus Defence and Space GmbH, German Research Centre for Geosciences - Helmholtz-Centre Potsdam (GFZ), and University of Birmingham [Birmingham]

Subjects
Atmospheric Science, Geophysics, [SDU]Sciences of the Universe [physics], Space and Planetary Science, Thermosphere model, Thermosphere model drivers, Aerospace Engineering, General Earth and Planetary Sciences, Thermosphere density data, Astronomy and Astrophysics, Satellite drag Thermosphere model Thermosphere density data Thermosphere model drivers, Satellite drag
Abstract

Accurate forecasts of thermosphere densities, realistic calculation of aerodynamic drag, and propagation of the uncertainty on the predicted orbit positions are required for conjunction analysis and collision avoidance decision making. The main focus of the Committee on Space Research (COSPAR) International Space Weather Action Teams (ISWAT) involved in atmosphere variability studies is satellite drag, and this paper reviews our current capabilities and lists recommendations. The uncertainty in the density of thermosphere models is due to the combined effect of employing simplified or incomplete algorithms, inconsistent and sparse density data, incomplete drivers for upper atmosphere heating processes (proxies for solar and geomagnetic activity), and forecast error of said drivers. When calculating drag, the uncertainty is amplified due to the satellite shape and aerodynamic model. The sources of uncertainty are reviewed in this paper, and possible and promising ways forward are proposed. Data assimilation models/approaches have demonstrated superior skill in reproducing the thermosphere's state and are the most promising way forward. However, data to drive the models is generally lacking, and they require significant computational resources. Substantial progress can only be made by means of setting up a full-blown observing system, including not only density and composition measurements, but equally the necessary model drivers.

Published
2023

3. Reactive transport experiments of coupled carbonation and serpentinization in a natural serpentinite. Implication for hydrogen production and carbon geological storage

Author

Osselin, Florian, Pichavant, Michel, Champallier, R��mi, Ulrich, Marc, Raimbourg, Hugues, 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), Métallogénie - 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), Institut Terre Environnement Strasbourg (ITES), École Nationale du Génie de l'Eau et de l'Environnement de Strasbourg (ENGEES)-Université de Strasbourg (UNISTRA)-Institut national des sciences de l'Univers (INSU - CNRS)-Centre National de la Recherche Scientifique (CNRS), ANR-10-LABX-0100,VOLTAIRE,Geofluids and Volatil elements – Earth, Atmosphere, Interfaces – Resources and Environment(2010), and ANR-11-EQPX-0036,PLANEX,Planète Expérimentation: simulation et analyse in-situ en conditions extrêmes(2011)

Subjects
010504 meteorology & atmospheric sciences, Serpentinization, FOS: Physical sciences, [SDU.STU]Sciences of the Universe [physics]/Earth Sciences, Reactive-percolation experiments, 010502 geochemistry & geophysics, 01 natural sciences, Geophysics (physics.geo-ph), Physics - Geophysics, [SDU]Sciences of the Universe [physics], 13. Climate action, Geochemistry and Petrology, Carbonation, Serpentinites, Hydrogen, 0105 earth and related environmental sciences
Abstract

International audience; Serpentinization and carbonation of ultramafic formations is a ubiquitous phenomenon, which deeply influences the biogeochemical cycles of water, hydrogen, carbon…while supporting the particular biosphere around the oceanic hydrothermal vents. Carbonation of peridotites and other mafic and ultramafic rocks is also a hot topic in the current energy landscape as the engineered sequestration of mineral CO2 in these formations could help reduce the atmospheric emissions and cope with climate change. In this study, we present two reactive percolation experiments performed on a natural serpentinite dredged from the ultraslow South-West Indian Oceanic Ridge. The serpentinite cores (length 3-4 cm and dia. 5.6 mm) were subjected for about 10 days to the continuous injection of a NaHCO3-saturated brine at respectively 160°C and 280°C. Petrographic and petrophysical results as well as outlet fluid compositions were compared to numerical batch simulations performed with the PHREEQC open software allowing to reconstruct the mineralogical evolution of both cores. The most striking observation is the fast and dramatic decrease of the permeability for both experiments principally due to the precipitation of carbonates. On the contrary, serpentine was found to be less impacting as it precipitates in low-flow zones, out of the main percolation paths. In total, about 5.6% of the total injected CO2 was retained in the core, at 280°C. In the same time, hydrogen was consistently produced with a total recovered H2 corresponding to 0.8% of the maximum H2 possible. The global behavior of the cores is interpreted as the result from an interplay between interacting spatio-temporal lengthscales controlled by the Damköhler number.

Published
2022

4. Effectiveness of the Bendixson–Dulac theorem

Author

Hector Giacomini, Armengol Gasull, Departament de Matemàtiques [Barcelona] (UAB), Universitat Autònoma de Barcelona (UAB), Institut Denis Poisson (IDP), Centre National de la Recherche Scientifique (CNRS)-Université de Tours-Université d'Orléans (UO), This work has received funding from the Ministerio de Ciencia e Innovación (PID2019-104658GB-I00 grant) and the Agència de Gestió d’Ajuts Universitaris i de Recerca (2017 SGR 1617grant)., and Centre National de la Recherche Scientifique (CNRS)-Université de Tours (UT)-Université d'Orléans (UO)

Subjects
Pure mathematics, Applied Mathematics, [MATH.MATH-DS]Mathematics [math]/Dynamical Systems [math.DS], Limit cycle, Function (mathematics), Type (model theory), MSC 2010 : Primary: 34C07. Secondary: 37C27, Curvature, Periodic orbit, Mathematics - Classical Analysis and ODEs, Bendixson–Dulac theorem, Classical Analysis and ODEs (math.CA), FOS: Mathematics, Liénard equation, Vector field, Limit (mathematics), [MATH]Mathematics [math], Bendixson-Dulac theorem, Analysis, Sign (mathematics), Mathematics
Abstract

22 pages, 30 réf.; We illustrate with several new applications the power and elegance of the Bendixson–Dulac theorem to obtain upper bounds of the number of limit cycles for several families of planar vector fields. In some cases we propose to use a function related with the curvature of the orbits of the vector field as a Dulac function. We get some general results for Li´enard type equations and for rigid planar systems. We also present a remarkable phenomenon: for each integer m ≥ 2, we provide a simple 1-parametric differential system for which we prove that it has limit cycles only for the values of the parameter in a subset of an interval of length smaller that 3√2(3/m)m/2 that decreases exponentially when m grows. One of the strengths of the results presented in this work is that although they are obtained with simple calculations, that can be easily checked by hand, they improve and extend previous studies. Another one is that, for certain systems, it is possible to reduce the question of the number of limit cycles to the study of the shape of a planar curve and the sign of an associated function in one or two variables.

Published
2021

5. Zinc isotopic fractionation between aqueous fluids and silicate magmas: An experimental study

Author

Fei Wu, Fang Huang, Haihao Guo, Ying Xia, 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), Magma - 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), Bayerisches Geoinstitut (BGI), Universität Bayreuth, CAS Key Laboratory of Crust–Mantle Materials and Environments [Hefei], School of Earth and Space Sciences [Hefei], University of Science and Technology of China [Hefei] (USTC)-University of Science and Technology of China [Hefei] (USTC)-Chinese Academy of Sciences [Beijing] (CAS), State Key Laboratory of Geological Processes and Mineral Resources [Wuhan] (GPMR), and China University of Geosciences [Wuhan] (CUG)

Subjects
Incompatible element, 010504 meteorology & atmospheric sciences, Inorganic chemistry, [SDU.STU]Sciences of the Universe [physics]/Earth Sciences, chemistry.chemical_element, Fractionation, Zinc, 010502 geochemistry & geophysics, 01 natural sciences, Silicate, Equilibrium fractionation, chemistry.chemical_compound, Igneous rock, Isotope fractionation, chemistry, [SDU]Sciences of the Universe [physics], 13. Climate action, Geochemistry and Petrology, [SDU.STU.VO]Sciences of the Universe [physics]/Earth Sciences/Volcanology, Igneous differentiation, 0105 earth and related environmental sciences
Abstract

International audience; Fluids in magmas play a key role in magma differentiation and transportation of economic metals for ore deposits. As a chalcophile and incompatible element, zinc and its isotopes have been increasingly applied to study the magmatic-hydrothermal processes. However, zinc isotopic fractionation between aqueous fluids and magmas has not been well constrained. Here we experimentally determined equilibrium fractionation factors of Zn isotopes between aqueous fluids and silicate magmas (Δ66Znfluid-magma= δ66Znfluid - δ66Znmagma). The results reveal that aqueous fluids are isotopically heavier than the coexisting silicate magmas. No correlation between Δ66Znfluid-magma and temperature or chlorine contents in fluids is observed under our experimental conditions. Instead, Δ66Znfluid-magma is negatively corresponded with NBO/T of the melt (the ratio of non-bridge oxygen and tetrahedron ions), and positively correlated with the molar ratio of Al/(0.5K+Ca+Fe) in the bulk magmas, suggesting the controlling of silicate composition on Zn isotope fractionation. Our data therefore indicate that the isotopically heavier Zn in the fluids exsolved from magmas may account for the higher δ66Zn of pegmatites and high-silica granitic rocks. Moreover, involvement of magmatic fluids can explain the highly variable and remarkably heavier Zn isotopic signatures of fumaroles, thermal spring waters, and seafloor hydrothermal fluids compared to the igneous rocks. This study provides information that can be used to guide research using Zn isotopes to trace fluid activity and magmatism.

Published
2021

6. Localised corrosion of iron and steel in the Callovo-Oxfordian porewater after 3 months at 120 °C: Characterizations at micro and nanoscale and formation mechanisms

Author

Hélène Lotz, Delphine Neff, Florence Mercier-Bion, Christian Bataillon, Philippe Dillmann, Emmanuel Gardés, Isabelle Monnet, James J. Dynes, Eddy Foy, IRAMAT - Laboratoire Archéomatériaux et Prévision de l'Altération (IRAMAT-LAPA), Institut de Recherche sur les Archéomatériaux (IRAMAT), Université de Technologie de Belfort-Montbeliard (UTBM)-Université d'Orléans (UO)-Université Paris-Saclay-Centre National de la Recherche Scientifique (CNRS)-Université de Technologie de Belfort-Montbeliard (UTBM)-Université d'Orléans (UO)-Université Paris-Saclay-Centre National de la Recherche Scientifique (CNRS), Nanosciences et Innovation pour les Matériaux, la Biomédecine et l'Energie (ex SIS2M) (NIMBE UMR 3685), Institut Rayonnement Matière de Saclay (IRAMIS), Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université Paris-Saclay-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université Paris-Saclay-Institut de Chimie du CNRS (INC)-Centre National de la Recherche Scientifique (CNRS), Laboratoire Archéomatériaux et Prévision de l'Altération (LAPA - UMR 3685), Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université Paris-Saclay-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université Paris-Saclay-Institut de Chimie du CNRS (INC)-Centre National de la Recherche Scientifique (CNRS)-Institut Rayonnement Matière de Saclay (IRAMIS), Service de la Corrosion et du Comportement des Matériaux dans leur Environnement (SCCME), Département de Physico-Chimie (DPC), CEA-Direction des Energies (ex-Direction de l'Energie Nucléaire) (CEA-DES (ex-DEN)), Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université Paris-Saclay-CEA-Direction des Energies (ex-Direction de l'Energie Nucléaire) (CEA-DES (ex-DEN)), Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université Paris-Saclay, 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)-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), Matériaux, Défauts et IRradiations (MADIR), Institut National des Sciences Appliquées (INSA)-Normandie Université (NU)-Institut National des Sciences Appliquées (INSA)-Centre National de la Recherche Scientifique (CNRS)-Université de Caen Normandie (UNICAEN), Canadian Light Source Inc., University of Saskatchewan [Saskatoon] (U of S), and ANR‐11‐EQPX‐0020

Subjects
STXM/XANES, Steel, MET/SAED, General Chemical Engineering, SEM, [CHIM]Chemical Sciences, General Materials Science, nuclear waste repository, General Chemistry, localized corrosion, Raman
Abstract

International audience; To investigate the fate of nuclear waste in geologic repositories, corrosion experiments were performed on a ferrito‐pearlitic (P285‐NH) and a ferritic steel (Armco) in a synthetic solution representing the Callovo-Oxfordian porewater for 3-months at 120°C. Corrosion product layers (CPL) were characterized from micro to nanoscale. Local corrosion areas of higher thicknesses were composed of siderite layers with different nano-morphologies, iron silicate, iron sulphate and magnetite. Their formation could be due to local pH variation, but also on metal microstructure (phases location and morphology). Differences in corrosion progress are suggested to be mainly related to differences in porewater chemistry and cathodic sites

Published
2023

7. Protein farnesylation is involved in nitrogen starvation adaptation in Arabidopsis

Author

Léo Bellenger, Eric Ducos, Muriel Feinard-Duranceau, Cécile Vincent-Barbaroux, Arnaud Lanoue, Marianne Unlubayir, Cécile Abdallah, Nathalie Pourtau, Benoit Porcheron, Anne Marmagne, Alexandra Launay-Avon, Christine Paysant Le Roux, Louis-Valentin Méteignier, Olivier Pichon, Christelle Dutilleul, Biomolécules et biotechnologies végétales (BBV EA 2106), Université de Tours (UT), Équipe de Recherche Contextes et Acteurs de l'Éducation (ERCAE), Université d'Orléans (UO), Laboratoire de Biologie des Ligneux et des Grandes Cultures (LBLGC), Université d'Orléans (UO)-Institut National de Recherche pour l’Agriculture, l’Alimentation et l’Environnement (INRAE), Ecologie et biologie des interactions (EBI), Université de Poitiers-Centre National de la Recherche Scientifique (CNRS), Institut Jean-Pierre Bourgin (IJPB), AgroParisTech-Université Paris-Saclay-Institut National de Recherche pour l’Agriculture, l’Alimentation et l’Environnement (INRAE), Institut des Sciences des Plantes de Paris-Saclay (IPS2 (UMR_9213 / UMR_1403)), Université d'Évry-Val-d'Essonne (UEVE)-Université Paris-Saclay-Centre National de la Recherche Scientifique (CNRS)-Université Paris Cité (UPCité)-Institut National de Recherche pour l’Agriculture, l’Alimentation et l’Environnement (INRAE), Plant Health Institute of Montpellier (UMR PHIM), Centre de Coopération Internationale en Recherche Agronomique pour le Développement (Cirad)-Institut de Recherche pour le Développement (IRD)-Institut National de Recherche pour l’Agriculture, l’Alimentation et l’Environnement (INRAE)-Institut Agro Montpellier, 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 de Montpellier (UM), 'Enseignement supérieur, de la Recherche et de l’Innovation' French Ministry, Region Centre-Val de Loire (PHD), and ANR-17-EURE-0007,SPS-GSR,Ecole Universitaire de Recherche de Sciences des Plantes de Paris-Saclay(2017)

Subjects
Protein farnesylation, ERA1, [SDV.BV]Life Sciences [q-bio]/Vegetal Biology, Primary metabolism, Nutritional stress, Plant Science, Nitrogen deprivation, Agronomy and Crop Science, Ecology, Evolution, Behavior and Systematics
Abstract

International audience; Nitrogen is an important element that controls plant growth and yield. Recently we showed that protein farnesylation is involved in nitrate-driven root architecture organization in Arabidopsis. In this study, we aimed to deeper investigate the role of this post-translational maturation in plant responses to nitrogen, by studying the metabolic and phenotypic adaptations of the era1.8 mutant (enhanced response to abscisic acid 1; i.e. lacking protein farnesylation activity) to various NH4NO3 supplies. WT and era1.8 plants were grown on low-nitrogen substrate supplemented with 0, 2 or 10 mM NH4NO3, and were analyzed for biomass production and carbonand nitrogen-related metabolites. Our results showed that compared to WT, era1.8 developed exacerbated responses to N starvation, i.e. a higher root/shoot ratio, a higher anthocyanins content and a higher carbon/nitrogen ratio. Moreover, transcriptomic analyzes revealed an over-expression of several genes related to nitrogen starvation adaptation in era1.8 and pointed out two genes encoding uncharacterized farnesylated proteins. At 2 and 10 mM NH4NO3, although the era1.8 mutant displayed a higher biomass, its metabolism and gene expression are comparable to that of WT. Overall, our results show that era1.8 develops exacerbated responses to nitrogen starvation with specific metabolic balances, highlighting that protein farnesylation participates to plant adaptation to nitrogen nutritional stress.

Published
2023

8. Metal-based environment-sensitive MRI contrast agents

Author

Éva Tóth, Célia S. Bonnet, Centre de biophysique moléculaire (CBM), Université d'Orléans (UO)-Institut National de la Santé et de la Recherche Médicale (INSERM)-Institut de Chimie du CNRS (INC)-Centre National de la Recherche Scientifique (CNRS), Bonnet, Célia, and Université d'Orléans (UO)-Institut National de la Santé et de la Recherche Médicale (INSERM)-Centre National de la Recherche Scientifique (CNRS)-Institut de Chimie du CNRS (INC)

Subjects
0301 basic medicine, Materials science, medicine.diagnostic_test, Cation detection, [SDV]Life Sciences [q-bio], Responsive probes, Contrast Media, Transition metal, Magnetic resonance imaging, Nanotechnology, 010402 general chemistry, Magnetic Resonance Imaging, 01 natural sciences, Biochemistry, 0104 chemical sciences, Analytical Chemistry, [SDV] Life Sciences [q-bio], 03 medical and health sciences, Preclinical research, 030104 developmental biology, Metal complexes, medicine, Molecular mri, MRI
Abstract

International audience; Interactions of paramagnetic metal complexes with their biological environment can modulate their magnetic resonance imaging (MRI) contrast-enhancing properties in different ways, and this has been widely exploited to create responsive probes that can provide biochemical information. We survey progress in two rapidly growing areas: the MRI detection of biologically important metal ions, such as calcium, zinc, and copper, and the use of transition metal complexes as smart MRI agents. In both fields, new imaging technologies, which take advantage of other nuclei (19F) and/or paramagnetic contact shift effects, emerge beyond classical, relaxation-based applications. Most importantly, in vivo imaging is gaining ground, and the promise of molecular MRI is becoming reality, at least for preclinical research.

Published
2021

9. Transport properties in molten carbonates: self-diffusion and conductivity measurements at high temperature

Author

V. Sarou-Kanian, L. del Campo, Lionel Cosson, A. Zhadan, Mohammed Malki, Catherine Bessada, Conditions Extrêmes et Matériaux : Haute Température et Irradiation (CEMHTI), Centre National de la Recherche Scientifique (CNRS)-Institut de Chimie du CNRS (INC)-Université d'Orléans (UO), and Université d'Orléans (UO)

Subjects
Self-diffusion, Materials science, Energy Engineering and Power Technology, Thermodynamics, 02 engineering and technology, PFG NMR, Conductivity, 010402 general chemistry, 7. Clean energy, 01 natural sciences, high temperature, Atmosphere, chemistry.chemical_compound, Electrical resistivity and conductivity, Eutectic system, electrical conductivity, Molten carbonates, Renewable Energy, Sustainability and the Environment, selfdiffusion, [CHIM.MATE]Chemical Sciences/Material chemistry, 021001 nanoscience & nanotechnology, Condensed Matter Physics, 0104 chemical sciences, Fuel Technology, chemistry, 13. Climate action, Fuel cells, Carbonate, CO2, 0210 nano-technology, Pulsed field gradient
Abstract

International audience; A better understanding and use of molten carbonate fuel cells (MCFCs) requires more detailed consideration on transport properties in melt. The combination of different methodological developments can be one solution to improve our comprehension. Here we present 23 Na and 7 Li self-diffusion coefficients measured by pulsed field gradient (PFG) NMR technique combined with electrical conductivity obtained by a 4-electrod set up, in the eutectic mixture Li2CO3-Na2CO3 (52:48 %mol) at high temperature (up to 1050 K), and under pure CO2 atmosphere. The results were compared with known experimental data from literature obtained by radiotracers techniques and 2-electrod set up and also with some calculations of the transport properties.

Published
2021

10. Crystal structure of Dictyoglomus thermophilum β-d-xylosidase DtXyl unravels the structural determinants for efficient notoginsenoside R1 hydrolysis

Author

Pierre Lafite, René de Vaumas, Richard Daniellou, Damien Bretagne, Arnaud Pâris, Institut de Chimie Organique et Analytique (ICOA), Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université d'Orléans (UO)-Institut National de la Santé et de la Recherche Médicale (INSERM)-Institut de Chimie du CNRS (INC)-Centre National de la Recherche Scientifique (CNRS), Extrasynthese, ANR-11-LABX-0029,SYNORG,Synthèse Organique : des molécules au vivant(2011), Université d'Orléans (UO)-Centre National de la Recherche Scientifique (CNRS)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Institut de Chimie du CNRS (INC)-Institut National de la Santé et de la Recherche Médicale (INSERM), LAFITE, Pierre, and Synthèse Organique : des molécules au vivant - - SYNORG2011 - ANR-11-LABX-0029 - LABX - VALID

Subjects
0301 basic medicine, [SDV.BIO]Life Sciences [q-bio]/Biotechnology, Ginsenosides, Stereochemistry, Crystal structure, Crystallography, X-Ray, Biochemistry, 03 medical and health sciences, Hydrolysis, Bacterial Proteins, Glycoside hydrolase, [SDV.BBM.BC]Life Sciences [q-bio]/Biochemistry, Molecular Biology/Biochemistry [q-bio.BM], [SDV.BBM.BC] Life Sciences [q-bio]/Biochemistry, Molecular Biology/Biochemistry [q-bio.BM], Bacteria, 030102 biochemistry & molecular biology, biology, Chemistry, Active site, Substrate (chemistry), Biological activity, General Medicine, biology.organism_classification, [SDV.BIO] Life Sciences [q-bio]/Biotechnology, Xylosidases, 030104 developmental biology, Biocatalysis, biology.protein, Dictyoglomus thermophilum
Abstract

International audience; $Dictyoglomus\ thermophilum$ β-d-xylosidase DtXyl is attractive as a potential thermostable biocatalyst able to produce biologically active ginsenosides intermediates from β-(1,2)-D-xylosylated compounds, including Notoginsenoside-R1. DtXyl was expressed as an active N-terminal His-tagged protein, and its crystal structure was solved in presence or absence of d-xylose product. Modelling of notoginsenoside R1 in DtXyl active site led to the identification of several hydrophobic residues interacting in close contact to the substrate hydrophobic core. Unlike other residues involved in substrate binding, these residues are not conserved among GH39 xylosidase family, and their physico-chemical properties can be correlated to the efficient binding and subsequent hydrolysis of Notoginsenoside R1.

Published
2021

11. Online vehicle aerodynamic drag observer with Kalman filters

Author

Y. El Gaouti, Guillaume Colin, N. Mazellier, B. Thiam, Université d'Orléans (UO), Laboratoire pluridisciplinaire de recherche en ingénierie des systèmes, mécanique et énergétique (PRISME), Université d'Orléans (UO)-Institut National des Sciences Appliquées - Centre Val de Loire (INSA CVL), Institut National des Sciences Appliquées (INSA)-Institut National des Sciences Appliquées (INSA), and Colin, Guillaume

Subjects
0209 industrial biotechnology, Observer (quantum physics), Computer science, Powertrain, 02 engineering and technology, 7. Clean energy, [SPI.AUTO]Engineering Sciences [physics]/Automatic, Computer Science::Robotics, Extended Kalman filter, 020901 industrial engineering & automation, 0203 mechanical engineering, Control theory, Robustness (computer science), Drag vehicle, Aerodynamic drag, Experimental results, Estimation theory, Extended Kalman Filter, Estimator, Kalman filter, Observer, Nonlinear System, [SPI.AUTO] Engineering Sciences [physics]/Automatic, 020303 mechanical engineering & transports, Control and Systems Engineering, Unscented Kalman Filter
Abstract

International audience; Aerodynamic drag is an important contributor to vehicle energy consumption, especially in highway conditions. Hence, estimating on-line the aerodynamic drag, or equivalently its coefficient, is an interesting challenge in order to reduce the energy consumption of vehicles. However, real systems are characterized by noisy sensor measurements. Extended Kalman Filter (EKF) is a commonly used algorithm for parameter estimation due to its stochastic filtering properties and is based on a first order approximation of the system dynamics. Similarly, the Unscented Kalman Filter (UKF) has been proposed as an alternative to the EKF in the field of nonlinear filtering and has received great attention in parameter estimation. This paper presents these two observers EKF and UKF for online estimation of the aerodynamic drag coefficient, based on noisy sensor measurements of a vehicle velocity, powertrain wheel torque and a longitudinal dynamic vehicle model. The design of the estimators is described and the performances are assessed against real measurements. The robustness is evaluated with different spoiler positions and the optimal position corresponding to a minimum of the aerodynamic drag coefficient is confirmed. Two different masses are used to validate each estimator.

Published
2021

12. Combustion of silane-nitrous oxide-argon mixtures: Analysis of laminar flame propagation and condensed products

Author

Mathieu Allix, Karl P. Chatelain, Yizhuo He, C. Paillard, Rémy Mével, Nabiha Chaumeix, Deanna A. Lacoste, Simon Lapointe, Tsinghua University [Beijing] (THU), King Abdullah University of Science and Technology (KAUST), Lawrence Livermore National Laboratory (LLNL), Conditions Extrêmes et Matériaux : Haute Température et Irradiation (CEMHTI), Centre National de la Recherche Scientifique (CNRS)-Institut de Chimie du CNRS (INC)-Université d'Orléans (UO), Université d'Orléans (UO), Institut de Combustion, Aérothermique, Réactivité et Environnement (ICARE), and Université d'Orléans (UO)-Centre National de la Recherche Scientifique (CNRS)-Institut des Sciences de l'Ingénierie et des Systèmes (INSIS)

Subjects
Materials science, Laminar flame speed, Silicon, silane, 020209 energy, General Chemical Engineering, Analytical chemistry, chemistry.chemical_element, 02 engineering and technology, Combustion, 7. Clean energy, chemistry.chemical_compound, Silica particle, Lattice constant, Expanding flame, 0202 electrical engineering, electronic engineering, information engineering, Physical and Theoretical Chemistry, Argon, [SPI.FLUID]Engineering Sciences [physics]/Reactive fluid environment, Mechanical Engineering, 021001 nanoscience & nanotechnology, Silane, chemistry, Volume (thermodynamics), 13. Climate action, 0210 nano-technology, Silicon nanowire, Powder diffraction
Abstract

International audience; The laminar burning rate, the explosion peak pressure, and the pressure rise coefficient have been measured for the first time for silane-nitrous oxide-argon mixtures using the spherically expanding flame technique in a constant volume combustion chamber. For these three parameters, the values obtained were higher than for hydrogen-nitrous oxide-argon and typical hydrocarbon-based mixtures. A maximum burning rate of 1800 g/m2 s was measured at 101 kPa, whereas under similar conditions, a maximum burning rate around 950 g/m2 s has been reported for hydrogen-nitrous oxide-argon mixtures. To better understand the chemical dynamics of flames propagating in SiH4–N2O–Ar mixtures, a detailed reaction model from the literature was improved using collision limit violation analysis and updated thermodynamic properties calculated with a high-level ab initio approach. The reaction model predicts the burning rate within 14% on average but demonstrates error close to 50% for the richest mixtures. The chemistry of the H–O–N system is important under all the conditions presently studied. The chemistry of the Si–H–O–N system demonstrates an increasing importance under rich conditions. In particular, the reactions (i) forming SiOx(s); (ii) describing the interaction of Si-species with N2O; and (iii) involving silicon hydrides, have an important role for the heat release dynamics. The condensed combustion products formed in the silane-nitrous oxide-argon flames were sampled and characterized using electron micrograph, electronic diffraction, energy-dispersive spectroscopy, and X-ray powder diffraction. For all equivalence ratios, silica spherical particles with a mean diameter in the range 200–300 nm were observed. In addition, for mixtures with Φ ≥ 2.2, silicon nanowires were formed. X-ray diffraction experiments showed that the silicon nanowires are composed of metal silicon characterized by a cubic structure (lattice parameter: a=5.425Å) with the Fm-3m space group.

Published
2021

13. Oxidation of di-n-butyl ether: Experimental characterization of low-temperature products in JSR and RCM

Author

Guillaume Dayma, Bruno Moreau, Philippe Dagaut, Nesrine Belhadj, Roland Benoit, Zeynep Serinyel, Maxence Lailliau, Fabrice Foucher, Fethi Khaled, Institut de Combustion, Aérothermique, Réactivité et Environnement (ICARE), Université d'Orléans (UO)-Centre National de la Recherche Scientifique (CNRS)-Institut des Sciences de l'Ingénierie et des Systèmes (INSIS), Laboratoire pluridisciplinaire de recherche en ingénierie des systèmes, mécanique et énergétique (PRISME), Université d'Orléans (UO)-Institut National des Sciences Appliquées - Centre Val de Loire (INSA CVL), Institut National des Sciences Appliquées (INSA)-Institut National des Sciences Appliquées (INSA), and ANR-11-LABX-0006,CAPRYSSES,Cinétique chimique et Aérothermodynamique pour des Propulsions et des Systèmes Energétiques Propres(2011)

Subjects
Reaction mechanism, Electrospray, 020209 energy, General Chemical Engineering, Radical, Inorganic chemistry, General Physics and Astronomy, Energy Engineering and Power Technology, Atmospheric-pressure chemical ionization, Ether, 02 engineering and technology, Mass spectrometry, 7. Clean energy, chemistry.chemical_compound, 020401 chemical engineering, 0202 electrical engineering, electronic engineering, information engineering, cool flame, 0204 chemical engineering, Uhplc-Hrms/ms, [SPI.FLUID]Engineering Sciences [physics]/Reactive fluid environment, ketohydroperoxides, General Chemistry, Orbitrap mass spectrometry, rapid compression machine, [CHIM.THEO]Chemical Sciences/Theoretical and/or physical chemistry, Dibutyl ether, Fuel Technology, chemistry, jet-stirred reactor, 13. Climate action, dibutyl ether, highly oxygenated molecules, Stoichiometry
Abstract

International audience; The oxidation of di-n-butyl-ether (DBE) was performed in a jet-stirred reactor (JSR) at 1 atm, 520 and 530 K, and from 480 to 670 K at 10 atm, at a residence time of 1 s, an equivalence ratio of 0.5, and an initial fuel concentration of 5000 ppm. Ignition experiments on DBE/air mixtures were also performed in a rapid compression machine (RCM) under stoichiometric conditions, 5 bar, and from 550 to 630 K. Low-temperature products formed in JSR and RCM experiments were characterized. To this end, high-resolution mass spectrometry analyses (HRMS) with flow injection analyses or ultra-high pressure liquid chromatography coupling were used to characterize hydroperoxides and diols (C8H18O3), ketohydroperoxides (C8H16O4), carboxylic acids (C2H4O2, C3H6O2, C4H8O2), di-keto ethers (C8H14O3), and highly oxygenated molecules (C8H14O5, C8H16O6, C8H14O6, C8H14O7, C8H16O8, and C8H14O9) resulting from up to five O2 additions on fuel's radicals. Whereas HOMs are of minor importance in combustion, they are considered key species for the formation of secondary organic aerosols. In addition, cyclic ethers and esters (C8H16O2) were observed. Heated electrospray and atmospheric pressure chemical ionizations (HESI and APCI) were used in positive and negative modes for MS analyses. H/D exchange with D2O was used to confirm the presence of –OH or –OOH groups in the products. The present results show that DBE oxidation proceeds similarly under JSR and RCM conditions. Whereas the CH2 groups neighboring the ether group are the most favorable sites for H-atom abstraction reactions, speciation indicated that other sites can react by metathesis forming a large pool of intermediates and products. Our kinetic reaction mechanism needs to be extended for simulating the formation of newly detected species.

Published
2020

14. Eucalyptol as bio-based solvent for Migita–Kosugi–Stille coupling reaction on O,S,N-heterocycle

Author

Sabine Berteina-Raboin, Joana F. Campos, CCSD, Accord Elsevier, Institut de Chimie Organique et Analytique (ICOA), Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université d'Orléans (UO)-Institut National de la Santé et de la Recherche Médicale (INSERM)-Institut de Chimie du CNRS (INC)-Centre National de la Recherche Scientifique (CNRS), and Université d'Orléans (UO)-Centre National de la Recherche Scientifique (CNRS)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Institut de Chimie du CNRS (INC)-Institut National de la Santé et de la Recherche Médicale (INSERM)

Subjects
Chemistry, chemistry.chemical_element, Bio based, 02 engineering and technology, General Chemistry, 010402 general chemistry, 021001 nanoscience & nanotechnology, 01 natural sciences, Nitrogen, Sulfur, Oxygen, Catalysis, 0104 chemical sciences, Stille reaction, Solvent, chemistry.chemical_compound, Eucalyptol, [CHIM] Chemical Sciences, [CHIM]Chemical Sciences, Organic chemistry, 0210 nano-technology
Abstract

International audience; We report herein an investigation on the use of eucalyptol as new solvent for organic transformations applied to the Migita-Kosugi-Stille palladium-catalyzed cross-coupling reaction. Heterocycles containing oxygen, sulfur and nitrogen were chosen as starting materials. Eucalyptol turned out to be a viable sustainable alternative to common solvents for this reaction.

Published
2020

15. Preface to Multiscale Simulation in Geochemistry

Author

Carl I. Steefel, Christophe Tournassat, Xiandong Liu, State Key Laboratory for Mineral Deposits Research, Nanjing University (NJU), 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), Bureau de Recherches Géologiques et Minières (BRGM) (BRGM), and Lawrence Berkeley National Laboratory [Berkeley] (LBNL)

Subjects
[SDU.STU.GC]Sciences of the Universe [physics]/Earth Sciences/Geochemistry, Geochemistry and Petrology, Chemistry, Geochemistry, 02 engineering and technology, 010402 general chemistry, 021001 nanoscience & nanotechnology, 0210 nano-technology, 01 natural sciences, ComputingMilieux_MISCELLANEOUS, 0104 chemical sciences
Abstract

International audience

Published
2020

16. Influence of elastic-viscoplastic behaviour on the filling efficiency of amorphous thermoplastic polymer during the micro hot embossing process

Author

N. Aït Hocine, G. Cheng, Thierry Barriere, F. Rabhi, 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 de Mécanique Gabriel Lamé (LaMé), Université d'Orléans (UO)-Institut National des Sciences Appliquées - Centre Val de Loire (INSA CVL), Institut National des Sciences Appliquées (INSA)-Institut National des Sciences Appliquées (INSA)-Université de Tours (UT), Institut National des Sciences Appliquées (INSA)-Institut National des Sciences Appliquées (INSA)-Université de Tours, Mécanique des Matériaux et Procédés (MMP), Université d'Orléans (UO)-Université de Tours-Institut National des Sciences Appliquées - Centre Val de Loire (INSA CVL), Institut National des Sciences Appliquées (INSA)-Institut National des Sciences Appliquées (INSA)-Université d'Orléans (UO)-Université de Tours-Institut National des Sciences Appliquées - Centre Val de Loire (INSA CVL), and Institut National des Sciences Appliquées (INSA)-Institut National des Sciences Appliquées (INSA)

Subjects
chemistry.chemical_classification, 0209 industrial biotechnology, Materials science, Viscoplasticity, Computer simulation, Strategy and Management, Constitutive equation, [PHYS.MECA]Physics [physics]/Mechanics [physics], 02 engineering and technology, Polymer, Management Science and Operations Research, 021001 nanoscience & nanotechnology, Methacrylate, Industrial and Manufacturing Engineering, Amorphous solid, 020901 industrial engineering & automation, chemistry, [SPI.MECA.MEMA]Engineering Sciences [physics]/Mechanics [physics.med-ph]/Mechanics of materials [physics.class-ph], [SPI.GPROC]Engineering Sciences [physics]/Chemical and Process Engineering, Composite material, 0210 nano-technology, Displacement (fluid), ComputingMilieux_MISCELLANEOUS, Microscale chemistry
Abstract

International audience; An unsolved issue in simulating the hot embossing of polymers is modelling the unfilled structured mould. This is because the constitutive law of such polymers has not been adequately determined, especially at the microscale or smaller. The present study investigated the influence of the elastic-viscoplastic behaviour on the filling efficiency of an amorphous polymer during the micro hot embossing process. Constitutive equations based on the two-layer viscoplastic model were used to simulate the hot embossing process. The micro-cavity of the mould was completely filled by the polymer, and the elastic, viscous, and plastic behaviours were considered simultaneously in the simulation. Compression tests were performed to identify the model parameter values for poly-methyl methacrylate. A numerical simulation was performed to analyse the contributions of the polymer’s elastic, viscous, and plastic behaviours. The unfilled area in the micro-cavity was evaluated after a displacement of 0.2 mm was applied to the mould. This was used as an indicator to compare the mould filling efficiency with those of the elastoplastic and elastic-viscoplastic constitutive models. The analysis led to the selection of an optimal elastic-viscoplastic model to completely fill the micro-cavity, which was consistent with the experimental results.

Published
2020

17. Kinetic and product studies of the reactions of NO3 with a series of unsaturated organic compounds

Author

Max R. McGillen, Ibrahim Ouchen, Yangang Ren, Abdelwahid Mellouki, Véronique Daële, Institut de Combustion, Aérothermique, Réactivité et Environnement (ICARE), Université d'Orléans (UO)-Centre National de la Recherche Scientifique (CNRS)-Institut des Sciences de l'Ingénierie et des Systèmes (INSIS), LE STUDIUM Loire Valley Institute for Advanced Studies, Université Mohammed V, ARD PIVOTS program (Ambition Recherche Développement Plateformes d'Innovation, de Valorisation, d'Optimisation, Technologiques environnmentaleS, supported by the centre-Val de Loire regional council), Le Studium, ANR-10-LABX-0100,VOLTAIRE,Geofluids and Volatil elements – Earth, Atmosphere, Interfaces – Resources and Environment(2010), ANR-16-CE01-0013,SEA-M,Impact des échanges air-mer sur la qualité de l'air dans les mégalopoles du littoral(2016), European Project: 730997,EUROCHAMP2020(2020), European Project: 690958,H2020,H2020-MSCA-RISE-2015,MARSU(2016), Université d'Orléans (UO)-Centre National de la Recherche Scientifique (CNRS)-Institut des Sciences de l'Ingénierie et des Systèmes (INSIS - CNRS), and Université Mohammed V de Rabat [Agdal] (UM5)

Subjects
Reaction mechanism, Environmental Engineering, 010504 meteorology & atmospheric sciences, Electrophilic addition, Radical, Epoxide, Methacrolein, Volatile organic compounds (VOCs), General Medicine, 010501 environmental sciences, 01 natural sciences, Medicinal chemistry, chemistry.chemical_compound, chemistry, NO3 radical, [SDE]Environmental Sciences, Methyl vinyl ketone, Environmental Chemistry, Products, Rate coefficient, Crotonaldehyde, [CHIM.OTHE]Chemical Sciences/Other, Isoprene, 0105 earth and related environmental sciences, General Environmental Science
Abstract

International audience; Rate coefficients for the reaction of NO3 radicals with 6 unsaturated volatile organic compounds (VOCs) in a 7300 L simulation chamber at ambient temperature and pressure have been determined by the relative rate method. The resulting rate coefficients were determined for isoprene, 2-carene, 3-carene, methyl vinyl ketone (MVK), methacrolein (MACR) and crotonaldehyde (CA), as (6.6 ± 0.8) × 10−13, (1.8 ± 0.6) × 10−11, (8.7 ± 0.5) × 10−12, (1.24 ± 1.04) × 10−16, (3.3 ± 0.9) × 10−15 and (5.7 ± 1.2) × 10−15 cm3/(molecule•sec), respectively. The experiments indicate that NO3 radical reactions with all the studied unsaturated VOCs proceed through addition to the olefinic bond, however, it indicates that the introduction of a carbonyl group into unsaturated VOCs can deactivate the neighboring olefinic bond towards reaction with the NO3 radical, which is to be expected since the presence of these electron-withdrawing substituents will reduce the electron density in the π orbitals of the alkenes, and will therefore reduce the rate coefficient of these electrophilic addition reactions. In addition, we investigated the product formation from the reactions of 2-carene and 3-carene with the NO3 radical. Qualitative identification of an epoxide (C10H16OH+), caronaldehyde (C10H16O2H+) and nitrooxy-ketone (C10H16O4NH+) was achieved using a proton transfer reaction time-of-flight mass spectrometer (PTR-TOF-MS) and a reaction mechanism is proposed.

Published
2020

18. A window in the course of alkaline magma differentiation conducive to immiscible REE-rich carbonatites

Author

Giada Iacono-Marziano, Malcolm Massuyeau, Emmanuel Le Trong, Ida Di Carlo, Johann Tuduri, Fabrice Gaillard, Laurent Bailly, Jérémie Melleton, Grégory Rogerie, Zineb Nabyl, 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), Magma - 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), University of Johannesburg [South Africa] (UJ), Institut für Mineralogie, Westfälische Wilhelms-Universität Münster = University of Münster (WWU), Bureau de Recherches Géologiques et Minières (BRGM) (BRGM), ANR-10-LABX-0100,VOLTAIRE,Geofluids and Volatil elements – Earth, Atmosphere, Interfaces – Resources and Environment(2010), European Project: 279790,EC:FP7:ERC,ERC-2011-StG_20101014,ELECTROLITH(2011), University of Johannesburg (UJ), and Westfälische Wilhelms-Universität Münster (WWU)

Subjects
Nephelinite, 010504 meteorology & atmospheric sciences, Geochemistry, 010502 geochemistry & geophysics, 01 natural sciences, Silicate, Cape verde, chemistry.chemical_compound, Igneous rock, chemistry, [SDU.STU.GC]Sciences of the Universe [physics]/Earth Sciences/Geochemistry, Geochemistry and Petrology, Magma, Carbonatite, Carbonate, Igneous differentiation, 0105 earth and related environmental sciences
Abstract

International audience; Rare earth element (REE) enrichments in carbonatites are often described as resulting from late magmatic-hydrothermal or supergene processes. However, magmatic pre-enrichment linked to the igneous processes at the origin of carbonatites are likely to contribute to the REE fertilisation. Experimental constraints reveals that immiscibility processes between carbonate and silicate melts can lead to both REE enrichments and depletions in carbonatites making the magmatic processes controlling REE enrichments unclear.We link REE contents of carbonatites to the magmatic stage at which carbonatites are separated from silicate magma in their course of differentiation. We present results of experiments made at pressure and temperature conditions of alkaline magmas and associated carbonatites differentiation (0.2 to 1.5 GPa; 725 to 975 °C; FMQ to FMQ +2.5), simultaneously addressing crystal fractionation of alkaline magmas and immiscibility between carbonate (calcio-carbonate type) and silicate melts (nephelinite to phonolite type). The experimental data shows that the degree of differentiation, controlling the chemical composition of alkaline melts, is a key factor ruling the REE concentration of the coexisting immiscible carbonate melts. In order to predict carbonate melt REE enrichments during alkaline magma differentiation, we performed a parameterisation of experimental data on immiscible silicate and carbonate melts, based exclusively on the silica content, the alumina saturation index and the alkali/alkaline-earth elements ratio of silicate melts. This parameterisation is applied to more than 1600 geochemical data of silicate magmas from various alkaline provinces (East African Rift, Canary and Cape Verde Islands) and show that REE concentrations of their potential coeval carbonatite melts can reach concentration ranges similar to those of highly REE enriched carbonatites (∑REE > 30 000 ppm) by immiscibility with phonolitic/phono-trachytic melt compositions, while more primitive alkaline magmas can only be immiscible with carbonatites that are not significantly enriched in REE.

Published
2020

19. Nanolime consolidation of the main building stone of the archaeological site of Volubilis (Morocco)

Author

Muzahim Al-Mukhtar, Ali Chaaba, Xavier Brunetaud, Kévin Beck, Dalal Badreddine, Génie Civil (GC), Laboratoire de Mécanique Gabriel Lamé (LaMé), Université d'Orléans (UO)-Institut National des Sciences Appliquées - Centre Val de Loire (INSA CVL), Institut National des Sciences Appliquées (INSA)-Institut National des Sciences Appliquées (INSA)-Université de Tours (UT)-Université d'Orléans (UO)-Institut National des Sciences Appliquées - Centre Val de Loire (INSA CVL), Institut National des Sciences Appliquées (INSA)-Institut National des Sciences Appliquées (INSA)-Université de Tours (UT), Ecole Nationale Supérieure d'Arts et Métiers [Meknes] (ENSAM), Université Moulay Ismail (UMI), Université d'Orléans (UO)-Université de Tours-Institut National des Sciences Appliquées - Centre Val de Loire (INSA CVL), Institut National des Sciences Appliquées (INSA)-Institut National des Sciences Appliquées (INSA)-Université d'Orléans (UO)-Université de Tours-Institut National des Sciences Appliquées - Centre Val de Loire (INSA CVL), and Institut National des Sciences Appliquées (INSA)-Institut National des Sciences Appliquées (INSA)

Subjects
Archeology, Consolidation (soil), Materials Science (miscellaneous), 010401 analytical chemistry, 02 engineering and technology, Conservation, Unesco world heritage, 021001 nanoscience & nanotechnology, 01 natural sciences, Archaeology, [SPI.MAT]Engineering Sciences [physics]/Materials, 0104 chemical sciences, Calcarenite, [SPI.GCIV]Engineering Sciences [physics]/Civil Engineering, Chemistry (miscellaneous), 0210 nano-technology, General Economics, Econometrics and Finance, ComputingMilieux_MISCELLANEOUS, Spectroscopy, Geology, Salt crystallization
Abstract

Volubilis is the most important archaeological site in Morocco, considered as a UNESCO world heritage site since 1997. Unfortunately, the sustainability of the site is in danger by the many degradation patterns detected on the site. Urgent interventions are required in order to consolidate and restore the monuments of the site. In this paper, the efficiency of nanolime as a consolidation treatment for calcarenite stone, the main construction stone of the site, was assessed. To create degraded reference samples, calcarenite samples were subjected to two accelerated aging tests: a thermal shock test and a salt crystallization test. The two tests created damage quite similar to that of the site, namely cracking and surface degradation respectively. These samples were then treated with nanolime according to a protocol defined in relation to the stone properties and the concentration of the product used. After the application of nanolime, the samples were characterized using non-destructive tests (P-wave velocity, capillary absorption, surface hardness, and colorimetric tests) depending on the type of stone damage. On cracked samples, the treatment acted on the surface of the stone while cracks were still present in depth. On salt crystallized samples, the treatment was efficient as it helped recover the lost surface cohesion. Therefore, the nanolime treatment is efficient for stones that are degraded at the surface (sanding, alveolization, scaling) but less so for cracked stones of the Volubilis site.

Published
2020

20. Metrological performances of fouling sensors based on steady thermal excitation applied to bioprocess

Author

M. Bégué, Y. Boukazia, L. Fillaudeau, M. Cadé, F. Bellouard, Guillaume Delaplace, N. Semmar, Processus aux Interfaces et Hygiène des Matériaux (PIHM), Institut National de la Recherche Agronomique (INRA), Heito SME, Heito S.A., Institut de Cancérologie de l'Ouest, Groupe de recherches sur l'énergétique des milieux ionisés (GREMI), Centre National de la Recherche Scientifique (CNRS)-Université d'Orléans (UO), Toulouse Biotechnology Institute (TBI), 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)-Institut National de Recherche pour l’Agriculture, l’Alimentation et l’Environnement (INRAE), Institut National de Recherche pour l’Agriculture, l’Alimentation et l’Environnement (INRAE), Unité Matériaux et Transformations - UMR 8207 (UMET), Centrale Lille-Institut de Chimie du CNRS (INC)-Université de Lille-Centre National de la Recherche Scientifique (CNRS)-Institut National de Recherche pour l’Agriculture, l’Alimentation et l’Environnement (INRAE), Aqualabo, Laboratoire Matériaux et Durabilité des constructions (LMDC), 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), Université d'Orléans (UO)-Centre National de la Recherche Scientifique (CNRS), Fédération de Recherche Fluides, Energie, Réacteurs, Matériaux et Transferts (FERMAT), Université de Toulouse (UT)-Centre National de la Recherche Scientifique (CNRS)-Institut National Polytechnique (Toulouse) (Toulouse INP), BPI France (FUI AAP16, F1311001L), Institut National des Sciences Appliquées (INSA)-Institut National des Sciences Appliquées (INSA)-Centre National de la Recherche Scientifique (CNRS)-Institut National de Recherche pour l’Agriculture, l’Alimentation et l’Environnement (INRAE), Institut de Chimie du CNRS (INC)-Université de Lille-Centre National de la Recherche Scientifique (CNRS)-Institut National de Recherche pour l’Agriculture, l’Alimentation et l’Environnement (INRAE)-Centrale Lille Institut (CLIL), Institut de Recherche Hydraulique, Université Toulouse III - Paul Sabatier (UT3), Université Fédérale Toulouse Midi-Pyrénées-Université Fédérale Toulouse Midi-Pyrénées-Institut National des Sciences Appliquées - Toulouse (INSA Toulouse), Institut National des Sciences Appliquées (INSA)-Institut National des Sciences Appliquées (INSA), Institut National des Sciences Appliquées (INSA)-Institut National des Sciences Appliquées (INSA)-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
0106 biological sciences, Work (thermodynamics), Materials science, General Chemical Engineering, Nuclear engineering, Heat transfer coefficient, 01 natural sciences, Biochemistry, 0404 agricultural biotechnology, 010608 biotechnology, Heat transfer, Thermal, [SPI.GPROC]Engineering Sciences [physics]/Chemical and Process Engineering, Fouling sensor, ComputingMilieux_MISCELLANEOUS, Microelectromechanical systems, MEMS structure, Fouling, Hot wire, 04 agricultural and veterinary sciences, 040401 food science, Steady thermal regime, 6. Clean water, Heat flux, Adhesive, Reduction (mathematics), Food and bioprocess, Food Science, Biotechnology
Abstract

International audience; Food and industrial bioprocesses are impacted by (biolfouling which generates failures from reduction of process efficiency (ex: reduction of heat transfer coefficient) up to health risk issue (e.g. biofilm formation). In present work, 3 fouling sensors based on a thermal excitation (steady thermal regime) were developed and described. These sensors were designed with different technologies (macro structure and Micro-Electro-Mechanical-Syste ms MEMS), geometries (intrusive cylindrical, flush plan) and packaging (presence or absence of cover panel) and compared. Laboratory setups were designed to characterize sensor responses under controlled operating conditions in batch and continuous process including clean condition and using layers of adhesive tape to simulate fouled conditions. Thermal responses from excitation under steady thermal regime at different heat flux were linearized then discussed as function of technology, geometry and packaging impacts. Packaging heat resistance, response times, efficient heat flux, and quantification of fouling were investigated. Finally, metrological limits were identified.

Published
2020

21. Measurements and Modelling of OH and Peroxy Radicals in an Indoor Environment Under Different Light Conditions and VOC Levels

Author

Eve-Agnès Fiorentino, Hui Chen, Adrien Gandolfo, Victor Lannuque, Karine Sartelet, Henri Wortham, Laboratoire Chimie de l'environnement (LCE), Aix Marseille Université (AMU)-Institut de Chimie du CNRS (INC)-Centre National de la Recherche Scientifique (CNRS), Laboratoire de Physique et Chimie de l'Environnement et de l'Espace (LPC2E), 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)-Centre National d’Études Spatiales [Paris] (CNES), Centre d'Enseignement et de Recherche en Environnement Atmosphérique (CEREA), École des Ponts ParisTech (ENPC)-EDF R&D (EDF R&D), EDF (EDF)-EDF (EDF), ANR-11-LABX-0064,SERENADE,Vers une conception de nanomatériaux innovants, durables et sûrs(2011), and ANR-11-IDEX-0001,Amidex,INITIATIVE D'EXCELLENCE AIX MARSEILLE UNIVERSITE(2011)

Subjects
Atmospheric Science, Photolysis, [SDU]Sciences of the Universe [physics], Air mixing, Radical chemistry, Light distribution, Indoor air, VOCs, General Environmental Science
Abstract

International audience; Indoor measurements of OH and sum of peroxy radicals XO2=HO2+RO2 were conducted in a room using window glasses of different transparencies and applying different coatings to the walls. Average OH and XO2 concentrations were found to vary in the range (0.6-4) × 105 molecule cm-3 and (1-7) × 107 molecule cm-3 respectively with anti-UV windows, and (6-10) × 105 molecule cm-3 and (4-16) × 107 molecule cm-3 respectively with borosilicate glasses. The OH and XO2 concentrations were compared with simulation results obtained using the H2I model, which accounts for the mixing between the sunlit and shaded volumes of the room. Taking into account the measurement uncertainty, the simulated OH concentrations agree with the observations on average while the simulated XO2 concentrations tend to be overestimated. Based on the model results, ozonolysis of unsaturated VOCs and photolysis of HONO and of organic compounds are found to represent the main primary sources of OH and XO2 radicals, the latter being more important in the sunlit volume. Despite the lower rate of the radical initiation in the shaded volume, the difference of radical concentrations in the shaded and sunlit volumes is mitigated by an interplay between the mixing time and the lifetime of XO2 radicals, allowing efficient transport of XO2 radicals into the shaded volume and acting there as a source of OH via radical propagation processes.

Published
2023

22. Radio detection of cosmic rays in [1.7–3.7] MHz: The EXTASIS experiment

Author

Richard Dallier, Lilian Martin, Alain Lecacheux, Benoît Revenu, D. García-Fernández, Antony Escudie, Didier Charrier, Laboratoire de physique subatomique et des technologies associées (SUBATECH), Université de Nantes - Faculté des Sciences et des Techniques, Université de Nantes (UN)-Université de Nantes (UN)-Centre National de la Recherche Scientifique (CNRS)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-IMT Atlantique Bretagne-Pays de la Loire (IMT Atlantique), Institut Mines-Télécom [Paris] (IMT)-Institut Mines-Télécom [Paris] (IMT), Unité Scientifique de la Station de Nançay (USN), Université d'Orléans (UO)-Observatoire des Sciences de l'Univers en région Centre (OSUC), 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)-Observatoire de Paris, PSL Research University (PSL)-Centre National de la Recherche Scientifique (CNRS), Observatoire de Paris - Site de Meudon (OBSPM), Observatoire de Paris, PSL Research University (PSL)-PSL Research University (PSL)-Centre National de la Recherche Scientifique (CNRS), Université de Nantes - UFR des Sciences et des Techniques (UN UFR ST), Centre National de la Recherche Scientifique (CNRS)-Observatoire de Paris, Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL)-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)-Institut national des sciences de l'Univers (INSU - CNRS)-Observatoire de Paris, Université Paris sciences et lettres (PSL)-Université d'Orléans (UO)-Centre National de la Recherche Scientifique (CNRS)-Université d'Orléans (UO), and Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL)-Centre National de la Recherche Scientifique (CNRS)

Subjects
air, FOS: Physical sciences, Cosmic ray, Scintillator, 01 natural sciences, Sudden death, Signal, Observatory, Electric field, 0103 physical sciences, [PHYS.PHYS.PHYS-INS-DET]Physics [physics]/Physics [physics]/Instrumentation and Detectors [physics.ins-det], Instrumentation and Methods for Astrophysics (astro-ph.IM), electric field: high, 010303 astronomy & astrophysics, High Energy Astrophysical Phenomena (astro-ph.HE), Physics, radio wave, showers: atmosphere, 010308 nuclear & particles physics, Astronomy, Astronomy and Astrophysics, observatory, cosmic radiation, Pulse-amplitude modulation, Astrophysics - Instrumentation and Methods for Astrophysics, Astrophysics - High Energy Astrophysical Phenomena, [PHYS.ASTR]Physics [physics]/Astrophysics [astro-ph], Radio wave
Abstract

Since 2003, significant efforts have been devoted to the understanding of the radio emission of extensive air showers above 20 MHz. Despite some studies led until the early nineties, the band available below 20 MHz has remained unused for 20 years. However, it has been claimed by some pioneering experiments that extensive air showers emit a strong electric field in this band and that there is evidence of a large increase of the radio pulse amplitude with decreasing frequencies. The EXTASIS experiment, located within the Nan\c{c}ay Radioastronomy Observatory and supported by the scintillator array and the autonomous radio stations of the CODALEMA experiment, aims to re-investigate the low-frequency band, and especially to study the so-called "sudden death" contribution, the expected electric field radiated by the shower front when hitting ground level. In this work, we present the instrumental setup of the EXTASIS experiment composed of~$7$ low-frequency antennas operating in [1.7-3.7] MHz and covering approximately \SI{1}{\kilo\metre\squared}. We report the observation of~$18$ air showers detected in coincidence in the three instruments, and estimate a detection threshold of \SI{23\pm4}{\micro\volt\per\metre} from comparisons with detailed SELFAS3 simulations. We also report a strong correlation of the low-frequency signal observation with the atmospheric electric field., Comment: Submitted to Astroparticle Physics, corresponding author: Antony Escudie

Published
2019

23. Dating of a ring on one of the largest known Roman iron anchors (La Grande-Motte, France): Combined metal and organic material radiocarbon analysis

Author

Sébastien Berthaut-Clarac, Emmanuel Nantet, Stéphanie Leroy, Emmanuelle Delqué-Količ, Marion Perron, Pierre Adam, Philippe Schaeffer, Céline Kerfant, Centre de Recherche sur les Sociétés et Environnements en Méditerranées (CRESEM), Université de Perpignan Via Domitia (UPVD), University of Haifa [Haifa], Laboratoire Archéomatériaux et Prévision de l'Altération (LAPA - UMR 3685), Nanosciences et Innovation pour les Matériaux, la Biomédecine et l'Energie (ex SIS2M) (NIMBE UMR 3685), Institut Rayonnement Matière de Saclay (IRAMIS), Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université Paris-Saclay-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université Paris-Saclay-Institut de Chimie du CNRS (INC)-Centre National de la Recherche Scientifique (CNRS)-Institut Rayonnement Matière de Saclay (IRAMIS), Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université Paris-Saclay-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université Paris-Saclay-Institut de Chimie du CNRS (INC)-Centre National de la Recherche Scientifique (CNRS), IRAMAT - Laboratoire Métallurgies et Cultures (IRAMAT-LMC), Institut de Recherche sur les Archéomatériaux (IRAMAT), Université de Technologie de Belfort-Montbeliard (UTBM)-Université d'Orléans (UO)-Université Paris-Saclay-Centre National de la Recherche Scientifique (CNRS)-Université de Technologie de Belfort-Montbeliard (UTBM)-Université d'Orléans (UO)-Université Paris-Saclay-Centre National de la Recherche Scientifique (CNRS), Laboratoire de mesure du carbone 14 (LMC14 - UMS 2572), Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Institut de Radioprotection et de Sûreté Nucléaire (IRSN)-Ministère de la Culture et de la Communication (MCC)-Centre National de la Recherche Scientifique (CNRS), Laboratoire des Sciences du Climat et de l'Environnement [Gif-sur-Yvette] (LSCE), Université de Versailles Saint-Quentin-en-Yvelines (UVSQ)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Institut national des sciences de l'Univers (INSU - CNRS)-Université Paris-Saclay-Centre National de la Recherche Scientifique (CNRS), Institut de Chimie de Strasbourg, Université de Strasbourg (UNISTRA)-Institut de Chimie du CNRS (INC)-Centre National de la Recherche Scientifique (CNRS), and Universitat Rovira i Virgili

Subjects
Large iron anchors, Radiocarbon analysis, Fibers, Ring, Pitch, Archeology, [CHIM]Chemical Sciences, Puddening, [SHS]Humanities and Social Sciences
Abstract

International audience; Underwater operations conducted along the southern French coast have unveiled two large, isolated anchors of iron. The largest ever found in the ancient Mediterranean, they reveal that Roman merchantmen moored in Aigues-Mortes Bay. A combination of analyses focusing on the ring, which belonged to one of the two anchors, offered the opportunity to collect data from isolated anchors and to document their production. Radiocarbon analysis, conducted for the first time on this type of object, determined that they were manufactured in the early imperial period. Another key discovery was a layer of fibers found in a concretion from the ring, which revealed rare remnants of ropes impregnated with pitch that could correspond to puddening. The replication of similar analyses on rings belonging to other anchors would provide a better understanding of this crucial component for ancient mooring.

Published
2022

24. Experimental investigation of the behaviour of a simulant material for plastic-bonded explosives and modelling of the effectivity and damage induced anisotropy

Author

Marwen Chatti, Michel Gratton, Michael Caliez, Arnaud Frachon, Didier Picart, Nourredine Aït Hocine, Mécanique des Matériaux et Procédés (MMP), Laboratoire de Mécanique Gabriel Lamé (LaMé), Université d'Orléans (UO)-Université de Tours (UT)-Institut National des Sciences Appliquées - Centre Val de Loire (INSA CVL), Institut National des Sciences Appliquées (INSA)-Institut National des Sciences Appliquées (INSA)-Université d'Orléans (UO)-Université de Tours (UT)-Institut National des Sciences Appliquées - Centre Val de Loire (INSA CVL), Institut National des Sciences Appliquées (INSA)-Institut National des Sciences Appliquées (INSA), CEA Le Ripault (CEA Le Ripault), Direction des Applications Militaires (DAM), and Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)

Subjects
Mechanics of Materials, [SPI.MECA.MEMA]Engineering Sciences [physics]/Mechanics [physics.med-ph]/Mechanics of materials [physics.class-ph], General Materials Science, Instrumentation, [SPI.MAT]Engineering Sciences [physics]/Materials
Abstract

International audience; This paper presents an original experimental investigation and modelling of the behaviour of a simulant material for Plastic-Bonded Explosives (PBXs). The conducted tests are tension, compression, alternated tension/ compression, confined compression, channel-die, and DMA. The experimental dispositive and protocols are presented and detailed. Monotonic and cyclic tests are conducted in addition to alternated and non-proportional tests. The obtained results are presented and discussed. A special focus was put on the damage induced anisotropy and the effectivity in the material behaviour. Also, hydrostatic pressure and strain rate dependencies and the presence of hysteresis loops and irreversible strains, are highlighted. Based on the experimental results, damage evolution laws and novel effectivity functions are proposed to model the material behaviour in the quasi-static domain.

Published
2022

25. On the least common multiple of several random integers

Author

Alin Bostan, Kilian Raschel, Alexander Marynych, Symbolic Special Functions : Fast and Certified (SPECFUN), Inria Saclay - Ile de France, Institut National de Recherche en Informatique et en Automatique (Inria)-Institut National de Recherche en Informatique et en Automatique (Inria), Faculty of Cybernetics [Kyiv], Taras Shevchenko National University of Kyiv, Institut Denis Poisson (IDP), Université d'Orléans (UO)-Université de Tours (UT)-Centre National de la Recherche Scientifique (CNRS), Centre National de la Recherche Scientifique (CNRS)-Université de Tours (UT)-Université d'Orléans (UO), and Centre National de la Recherche Scientifique (CNRS)-Université de Tours-Université d'Orléans (UO)

Subjects
trimmed sums of geometric laws, Primary: 11A05, 11N37, Secondary: 11A25, 60F05, Convergence in distribution, least common multiple, Infinite product, 010103 numerical & computational mathematics, prime products, 01 natural sciences, Combinatorics, FOS: Mathematics, Arithmetic function, Number Theory (math.NT), 0101 mathematics, Least common multiple, Mathematics, Algebra and Number Theory, Mathematics - Number Theory, Diophantine equation, Probability (math.PR), 010102 general mathematics, Multiplicative function, Generating function, Prime number, [MATH.MATH-NT]Mathematics [math]/Number Theory [math.NT], [MATH.MATH-PR]Mathematics [math]/Probability [math.PR], Convergence of random variables, Mathematics - Probability
Abstract

Let $L_n(k)$ denote the least common multiple of $k$ independent random integers uniformly chosen in $\{1,2,\ldots ,n\}$. In this note, using a purely probabilistic approach, we derive a criterion for the convergence in distribution as $n\to\infty$ of $\frac{f(L_n(k))}{n^{rk}}$ for a wide class of multiplicative arithmetic functions~$f$ with polynomial growth $r>-1$. Furthermore, we identify the limit as an infinite product of independent random variables indexed by prime numbers. Along the way, we compute the generating function of a trimmed sum of independent geometric laws, occurring in the above infinite product. This generating function is rational; we relate it to the generating function of a certain max-type Diophantine equation, of which we solve a generalized version. Our results extend theorems by Erd\H{o}s and Wintner (1939), Fern\'{a}ndez and Fern\'{a}ndez (2013) and Hilberdink and T\'{o}th (2016)., Comment: 19 pages

Published
2019

26. Experimental constraints on the differentiation of low-alkali magmas beneath the Tonga arc: Implications for the origin of arc tholeiites

Author

Chris W. Firth, Hugh St. C. O'Neill, Saskia Erdmann, Tracy Rushmer, Raul Brens, Simon Turner, Trevor H. Green, John Adam, Department of Earth and Planetary Sciences [North Ryde], Macquarie University, 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)-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), Magma - UMR7327, 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), Research School of Earth Sciences [Canberra] (RSES), and Australian National University (ANU)

Subjects
Basalt, 010504 meteorology & atmospheric sciences, Tonga-Kermadec Tholeiite Crystal fractionation Experimental petrology, Partial melting, Geochemistry, Geology, engineering.material, 010502 geochemistry & geophysics, Dacite, 01 natural sciences, Basaltic andesite, [SDU]Sciences of the Universe [physics], 13. Climate action, Geochemistry and Petrology, engineering, Plagioclase, Phenocryst, Igneous differentiation, Amphibole, 0105 earth and related environmental sciences
Abstract

International audience; Hydrous melting experiments on a basaltic andesite from Late Volcano in the Tonga Arc were conducted at 900–1250 °C and 1 atm to 2.5 GPa, with a range of added H2O concentrations (0–9 wt%). These were used to constrain conditions of phenocryst precipitation in the basaltic andesite and to better understand the processes of magmatic differentiation beneath Tongan volcanoes. Comparison between the products of experiments and Tongan lavas indicates that basaltic andesites from Late crystallised plagioclase + augite + pigeonite ± orthopyroxene while water-saturated at comparatively low pressures (≤0.2 GPa) but high temperatures (≥1000 °C). Glasses produced at 950 °C and 0.2 GPa are similar in composition to dacites from neighbouring volcanoes, including Fonualei. This confirms previous interpretations of dacite magma genesis by crystal fractionation of plagioclase and clinopyroxene from basaltic andesite parent magmas, rather than by partial melting of lower crust. This produces decreases in Dy/Yb with increasing SiO2 without a role for amphibole, probably due to the high temperatures and low alkali concentrations involved. Tongan magmas are primarily tholeiitic, and their high water contents bring into question previous hypotheses that attribute the tholeiitic trend to low concentrations of magmatic H2O. Attributes inherited from the Tongan parent magmas, including low alkali concentrations, appear to drive tholeiitic differentiation, regardless of water content.

Published
2019

27. Me or just like me? The role of virtual try-on and physical appearance in apparel M-retailing

Author

Hélène Saurel, Daria Plotkina, Hommes et management en société / Humans and management in society (Humanis), Ecole de Management de Strasbourg (EM Strasbourg)-Université de Strasbourg (UNISTRA), Val de Loire Recherche en Management (VALLOREM), Université d'Orléans (UO)-Université de Tours (UT), and Université d'Orléans (UO)-Université de Tours

Subjects
Marketing, Value (ethics), business.industry, media_common.quotation_subject, 05 social sciences, Usability, Advertising, Human physical appearance, Clothing, [SHS]Humanities and Social Sciences, Presentation, 0502 economics and business, 050211 marketing, Augmented reality, Technology acceptance model, Product (category theory), business, Psychology, 050203 business & management, media_common
Abstract

This research investigated a crucial topic in apparel m-commerce: product presentation and the extent to which it should exhibit human visuals corresponding to consumers' appearance. A mobile application with virtual try-on (VTO) tool based on augmented reality was compared to a traditional m-commerce interface showing models with physical features not, partially, or completely similar to the consumers’. A theoretical framework based on the Technology Acceptance Model was adopted to explain the impact of the application and the mediating role of perceived hedonic value (enjoyment) and utilitarian value (convenience, ease of use, and usefulness) on attitude toward the shopping technology and purchase intention. An online experiment (415 respondents) and a qualitative study (49 respondents) showed that the VTO tool was less enjoyable than traditional m-commerce interfaces and less convenient and useful than pictures of models with physical features similar to those of consumers. Implications for academics and managers are discussed.

Published
2019

28. Health risk associated with the oral consumption of 'Chiniy-tref', a traditional medicinal preparation used in Martinique (French West Indies): Qualitative and quantitative analyses of aristolochic acids contained therein

Author

Jérôme Langrand, Camille Wattez, Cyril Colas, Ludivine Riffault-Valois, Alain Blateau, Xavier Cachet, Sylvie Michel, Denis Boucaud-Maitre, Thomas Gaslonde, Emmanuel Nossin, CHU Pointe-à-Pitre/Abymes [Guadeloupe], Institut de Chimie Organique et Analytique (ICOA), Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université d'Orléans (UO)-Institut National de la Santé et de la Recherche Médicale (INSERM)-Institut de Chimie du CNRS (INC)-Centre National de la Recherche Scientifique (CNRS), Centre de biophysique moléculaire (CBM), Université d'Orléans (UO)-Institut National de la Santé et de la Recherche Médicale (INSERM)-Institut de Chimie du CNRS (INC)-Centre National de la Recherche Scientifique (CNRS), Université d'Orléans (UO)-Centre National de la Recherche Scientifique (CNRS)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Institut de Chimie du CNRS (INC)-Institut National de la Santé et de la Recherche Médicale (INSERM), and Université d'Orléans (UO)-Institut National de la Santé et de la Recherche Médicale (INSERM)-Centre National de la Recherche Scientifique (CNRS)-Institut de Chimie du CNRS (INC)

Subjects
0106 biological sciences, [SDV]Life Sciences [q-bio], location.country, Toxicology, 01 natural sciences, 03 medical and health sciences, location, Animals, Medicine, Martinique, Health risk, Toxins, Biological, West indies, 0303 health sciences, Traditional medicine, biology, business.industry, 010604 marine biology & hydrobiology, 030302 biochemistry & molecular biology, Aristolochia, biology.organism_classification, Quantitative determination, 3. Good health, Phytochemical, Martinique island, Larva, Aristolochic Acids, Medicine, Traditional, business, Risk assessment, Butterflies, Battus polydamas
Abstract

"Chiniy-tref" (CT) is a traditional preparation used in folk medicine in Martinique Island (French West Indies) that is nowadays mainly taken orally to prevent or act against any "manifestation of evil". CT is easily prepared at home by macerating larvae of the endemic swallowtail Battus polydamas (ssp.) cebriones (Dalman, 1823), sometimes accompanied by a leaf of its host-plant Aristolochia trilobata L., in commercial rum. We have previously reported the detection of nephrotoxic and carcinogenic aristolochic acids (AAs) I and II in CT, leading the Regional Health Agency (ARS) of Martinique to issue an alert regarding the potential risks associated with its consumption in 2015. In order to complete the toxicity risk assessment for oral consumption of CT, a full qualitative analysis of AAs and their analogues (AAAs) was performed, as well as a quantitative determination of the major AAs, namely AAs I and II. The phytochemical profiling of AAAs present in CT, that also corresponds to that of B. polydamas cebriones larvae feeding on A. trilobata, has been established for the first time by ultra-high performance liquid chromatography/electrospray ionization quadrupole time of-flight tandem mass spectrometry. AAs I and II were quantified in a small panel of tinctures by using a validated UHPLC/UV method, allowing us to estimate the probable daily intakes of these toxins by CT consumers. The results proved the existence of a real risk of renal toxicity and carcinogenicity associated with the chronic oral consumption of CT in Martinique, and more generally of similar "snake bottles" throughout the Caribbean.

Published
2019

29. Geochemical and sulfate isotopic evolution of flowback and produced waters reveals water-rock interactions following hydraulic fracturing of a tight hydrocarbon reservoir

Author

Wolfram Kloppmann, Christopher R. Clarkson, S. Saad, Bernhard Mayer, Florian Osselin, Michael Nightingale, G. Hearn, A. M. Desaulty, Eric C. Gaucher, 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), Métallogénie - 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), University of Calgary, Seven Generations Energy, Bureau de Recherches Géologiques et Minières (BRGM) (BRGM), and ANR-14-CE05-0050,G-Baseline,Conditions de références environnementales pour l'évaluation de l'impact de l'exploitation de gaz non conventionnels : Traceurs géochimiques et méthodes de suivi avancés(2014)

Subjects
Tight gas, Environmental Engineering, 010504 meteorology & atmospheric sciences, Dolomite, Geochemistry, stable isotopes, 010501 environmental sciences, engineering.material, hydraulic fracturing, 01 natural sciences, persulfate breaker, chemistry.chemical_compound, Hydraulic fracturing, Environmental Chemistry, Sulfate, Tight gas Hydraulic fracturing Flowback geochemistry Persulfate breaker Heavy metals Stable isotopes, heavy metals, Waste Management and Disposal, 0105 earth and related environmental sciences, Anhydrite, flowback geochemistry, Pollution, Petroleum reservoir, Produced water, 6. Clean water, chemistry, [SDU]Sciences of the Universe [physics], 13. Climate action, engineering, Environmental science, Pyrite
Abstract

International audience; Although multistage hydraulic fracturing is routinely performed for the extraction of hydrocarbon resources from low permeability reservoirs, the downhole geochemical processes linked to the interaction of fracturing fluids with formation brine and reservoir mineralogy remain poorly understood. We present a geochemical dataset of flowback and produced water samples from a hydraulically fractured reservoir in the Montney Formation, Canada, analyzed for major and trace elements and stable isotopes. The dataset consists in 25 samples of flowback and produced waters from a single well, as well as produced water samples from 16 other different producing wells collected in the same field. Additionally, persulfate breaker samples as well as anhydrite and pyrite from cores were also analyzed. The objectives of this study were to understand the geochemical interactions between formation and fracturing fluids and their consequences in the context of tight gas exploitation. The analysis of this dataset allowed for a comprehensive understanding of the coupled downhole geochemical processes, linked in particular to the action of the oxidative breaker. Flowback fluid chemistries were determined to be the result of mixing of formation brine with the hydraulic fracturing fluids as well as coupled geochemical reactions with the reservoir rock such as dissolution of anhydrite and dolomite; pyrite and organic matter oxidation; and calcite, barite, celestite, iron oxides and possibly calcium sulfate scaling. In particular, excess sulfate in the collected samples was found to be mainly derived from anhydrite dissolution, and not from persulfate breaker or pyrite oxidation. The release of heavy metals from the oxidation activity of the breaker was detectable but concentrations of heavy metals in produced fluids remained below the World Health Organization guidelines for drinking water and are therefore of no concern. This is due in part to the co-precipitation of heavy metals with iron oxides and possibly sulfate minerals.

Published
2019

30. Numerical modelling of column experiments to investigate in-situ bioleaching as an alternative mining technology

Author

Philippe Marion, Fabrice Golfier, Jean-Jacques Royer, Lev Filippov, Pauline Collon, Bénédicte Lechenard, Caroline Izart, Gautier Laurent, Laurent Truche, GeoRessources, Centre National de la Recherche Scientifique (CNRS)-Université de Lorraine (UL)-Centre de recherches sur la géologie des matières premières minérales et énergétiques (CREGU)-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), Métallogénie - 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), Institut des Sciences de la Terre (ISTerre), Institut Français des Sciences et Technologies des Transports, de l'Aménagement et des Réseaux (IFSTTAR)-Institut national des sciences de l'Univers (INSU - CNRS)-Institut de recherche pour le développement [IRD] : UR219-Université Savoie Mont Blanc (USMB [Université de Savoie] [Université de Chambéry])-Centre National de la Recherche Scientifique (CNRS)-Université Grenoble Alpes [2016-2019] (UGA [2016-2019]), ANR-10-LABX-0021,RESSOURCES21,Strategic metal resources of the 21st century(2010), European Project: 642456,H2020,H2020-SC5-2014-one-stage,BioMOre(2015), and Institut national des sciences de l'Univers (INSU - CNRS)-Centre de recherches sur la géologie des matières premières minérales et énergétiques (CREGU)-Université de Lorraine (UL)-Centre National de la Recherche Scientifique (CNRS)

Subjects
Numerical Modelling, Chemical substance, 0211 other engineering and technologies, 02 engineering and technology, [CHIM.INOR]Chemical Sciences/Inorganic chemistry, Industrial and Manufacturing Engineering, 020401 chemical engineering, Hydraulic conductivity, Bioleaching, Materials Chemistry, 0204 chemical engineering, Porosity, Reactive Transport, [SDU.STU.AG]Sciences of the Universe [physics]/Earth Sciences/Applied geology, Dissolution, 021102 mining & metallurgy, Petroleum engineering, Chemistry, Metals and Alloys, Dual Porosity, Grain size, Leaching (chemistry), Science, technology and society, In-Situ Recovery, Copper, [SDU.STU.MI]Sciences of the Universe [physics]/Earth Sciences/Mineralogy
Abstract

International audience; This publication investigates indirect in-situ bioleaching as an alternative mining technology for minimizing waste production, environmental impact, and chemical consumption. The process consists in injecting a leaching solution into a targeted ore body for dissolving base metal bearing minerals, while iron-oxidizing microorganisms regenerate the solution. In this contribution, we present laboratory column experiments that investigate the impact of grain size on the action of an acidic oxidizing solution in contact with ore samples crushed at different grain sizes. These results are used for developing a one-dimensional reactive transport model based on PhreeqC software. In this model, porous and fractured media are approached by a dual porosity reactive transport model where dissolution reactions are described by kinetics. Column experiments are used as a reference for calibrating the key parameters of the numerical models, which include the relative volume of mobile and immobile zones within the dual porosity medium and the exchange rate between these two volumes. This model is then adapted to in-situ conditions by considering the preferential flow of fluids through natural or artificial fractures of enhanced hydraulic conductivity. These models are used to discuss key elements affecting the feasibility of coupling bioleaching and in-situ recovery for improving the sustainability of mining, especially for deep and complex ore deposits.

Published
2019

31. Steady-state regimes prediction of a multi-degree-of-freedom unstable dynamical system coupled to a set of nonlinear energy sinks

Author

Sergio Bellizzi, Baptiste Bergeot, Dynamique interactions vibrations Structures (DivS), Laboratoire de Mécanique Gabriel Lamé (LaMé), Université d'Orléans (UO)-Institut National des Sciences Appliquées - Centre Val de Loire (INSA CVL), Institut National des Sciences Appliquées (INSA)-Institut National des Sciences Appliquées (INSA)-Université de Tours (UT)-Université d'Orléans (UO)-Institut National des Sciences Appliquées - Centre Val de Loire (INSA CVL), Institut National des Sciences Appliquées (INSA)-Institut National des Sciences Appliquées (INSA)-Université de Tours (UT), Laboratoire de Mécanique et d'Acoustique [Marseille] (LMA ), Aix Marseille Université (AMU)-École Centrale de Marseille (ECM)-Centre National de la Recherche Scientifique (CNRS), Université d'Orléans (UO)-Université de Tours (UT)-Institut National des Sciences Appliquées - Centre Val de Loire (INSA CVL), Institut National des Sciences Appliquées (INSA)-Institut National des Sciences Appliquées (INSA)-Université d'Orléans (UO)-Université de Tours (UT)-Institut National des Sciences Appliquées - Centre Val de Loire (INSA CVL), Institut National des Sciences Appliquées (INSA)-Institut National des Sciences Appliquées (INSA), Institut National des Sciences Appliquées - Centre Val de Loire (INSA CVL), Institut National des Sciences Appliquées (INSA), Université d'Orléans (UO)-Université de Tours-Institut National des Sciences Appliquées - Centre Val de Loire (INSA CVL), Institut National des Sciences Appliquées (INSA)-Institut National des Sciences Appliquées (INSA)-Université d'Orléans (UO)-Université de Tours-Institut National des Sciences Appliquées - Centre Val de Loire (INSA CVL), and Centre National de la Recherche Scientifique (CNRS)-Aix Marseille Université (AMU)-École Centrale de Marseille (ECM)

Subjects
0209 industrial biotechnology, Singular perturbation, Asymptotic analysis, set of nonlinear energy sinks, passive mitigation, Aerospace Engineering, 02 engineering and technology, Fixed point, Dynamical system, 01 natural sciences, 020901 industrial engineering & automation, relaxation oscillations, mitigation limit, 0103 physical sciences, Applied mathematics, 010301 acoustics, Civil and Structural Engineering, Mathematics, Steady state, Mechanical Engineering, Linear system, Multi-degree-of-freedom unstable system, [PHYS.MECA.ACOU]Physics [physics]/Mechanics [physics]/Acoustics [physics.class-ph], Computer Science Applications, asymptotic analysis, Nonlinear system, Control and Systems Engineering, Biorthogonal system, [NLIN.NLIN-CD]Nonlinear Sciences [physics]/Chaotic Dynamics [nlin.CD], Signal Processing
Abstract

International audience; A general method to predict the steady-state regimes of a multi-degree-of-freedom unstable vibrating system (the primary system) coupled to several nonlinear energy sinks (NESs) is proposed. The method has three main steps. The first step consists in the diagonalization of the primary underline linear system using the so-called biorthogonal transformation. Within the assumption of a primary system with only one unstable mode the dynamics of the diagonalized system is reduced ignoring the stable modes and keeping only the unstable mode. The complexification method is applied in the second step with the aim of obtaining the slow-flow of the reduced system. Then, the third step is an asymptotic analysis of the slow-flow based geometric singular perturbation theory. The analysis shows that the critical manifold of the system can be reduced to a one dimensional parametric curve evolving in a multidimensional space. The shape and the stability properties of the critical manifold and the stability properties of the fixed points of the slow-flow provide an analytical tool to predict the nature of the possible steady-state regimes of the system. Finally, two examples are considered to evaluate the effectiveness and advancement of the proposed method. The method is first applied to the prediction of the mitigation limit of a breaking system subject to friction-induced vibrations coupled to two NESs, and next an airfoil model undergoing an aeroelastic instability coupled to a NESs setup (from one to four) is discussed. Theoretical results are compared, for validation purposes, to direct numerical integration of the system. The comparisons show good agreement.

Published
2019

32. Metal-based redox-responsive MRI contrast agents

Author

Carlos F. G. C. Geraldes, Éva Tóth, Mário J. F. Calvete, Vanessa A. Tomé, M. Margarida C. A. Castro, Sara M. A. Pinto, Centro de Química, Department of Chemistry, University of Coimbra, Department of Chemistry, University of Coimbra, Department of Life Sciences, University of Coimbra, Centre de biophysique moléculaire (CBM), Université d'Orléans (UO)-Institut National de la Santé et de la Recherche Médicale (INSERM)-Centre National de la Recherche Scientifique (CNRS)-Institut de Chimie du CNRS (INC), Université d'Orléans (UO)-Institut National de la Santé et de la Recherche Médicale (INSERM)-Institut de Chimie du CNRS (INC)-Centre National de la Recherche Scientifique (CNRS), and LEGOUPIL, Laëtitia

Subjects
PARACEST agents, Nanoparticle, 010402 general chemistry, 01 natural sciences, Redox, Redox Activity, Inorganic Chemistry, Metal, [CHIM] Chemical Sciences, MRI contrast agents, Materials Chemistry, medicine, [CHIM]Chemical Sciences, Physical and Theoretical Chemistry, Redox responsive probes, medicine.diagnostic_test, 010405 organic chemistry, Chemistry, Ligand, Magnetic resonance imaging, Redox responsive, Transition metal ions, 0104 chemical sciences, 3. Good health, Metal chelates, Relaxation agents, Inorganic nanoparticles, visual_art, visual_art.visual_art_medium, Biophysics, Hypoxia probes
Abstract

International audience; Given their potential in a better characterization and diagnosis of major pathologies like cancer or chronic inflammation, redox-activated Magnetic Resonance Imaging (MRI) probes have recently attracted much interest from chemists. Such redox responsive probes are capable of reporting on specific biomarkers that are related to tissue redox potential disruption or hypoxia. Lately, this research area has experienced remarkable development, including redox-responsive metal complexes and nanoparticles. Here we critically review the progress with a specific focus on metal-based probes and some nanoparticle examples. We demonstrate, via representative cases, the different molecular mechanisms that can generate a redox-modulated MRI response. They can be based on the redox activity of either the ligand or the metal center, provided the different oxidation states of the metal ion are endowed with different magnetic properties. A particular emphasis is given to recent advances and to the imaging probes that have attained in vivo validation. In overall, we aim to provide the reader with a comprehensive view of how intracellular or extracellular redox buffer systems can be assessed by using MRI contrast agents based on lanthanide or transition metal ions using T1-weighted, T2-weighted, paraCEST 1H or 19F MRI.

Published
2019

33. Multi-isotopic tracing (Mo, S, Pb, Re Os) and genesis of the Mo W Azegour skarn deposit (High-Atlas, Morocco)

Author

Samia Berrada Hmima, Eric Marcoux, Noémie Breillat, Philippe Négrel, David Selby, Catherine Guerrot, 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), Métallogénie - 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), Bureau de Recherches Géologiques et Minières (BRGM) (BRGM), Laboratoire de Géo-ressources, Unité associée au CNRST (URAC 42) (LGR), Université Cadi Ayyad [Marrakech] (UCA), and Durham University

Subjects
010504 meteorology & atmospheric sciences, Geochemistry, Skarn, engineering.material, 010502 geochemistry & geophysics, 01 natural sciences, Sulphur, δ34S, Isotopes, Molybdenite, Rayleigh fractionation, Azegour skarn, Pyrrhotite, 0105 earth and related environmental sciences, Earth-Surface Processes, Molybdenum, Chalcopyrite, Mineralisation, Geology, Re-Os geochronology, Lead, visual_art, Geochronology, visual_art.visual_art_medium, engineering, Sedimentary rock, [SDU.STU.MI]Sciences of the Universe [physics]/Earth Sciences/Mineralogy
Abstract

International audience; The Mo-Cu-W Azegour skarn, located in the High-Atlas in Morocco, is associated with a Late Hercynian alkaline granitic intrusion. Here the origin of the mineralisation via Re-Os geochronology and using Mo, S and Pb isotopes is discussed. The age of mineralisation defined by Re-Os molybdenite geochronology is 276 ± 1.2 Ma for the Azegour mine, and 267 ± 1.2 for the Tizgui deposit suggesting for multiple mineralisation events associated with the Hercynian alkaline granitic intrusion. The δ98MoNIST of molybdenite range from −0.60‰ to 0.42‰ (n = 26) for the Azegour mine and from 0.08‰ to 0.40‰ (n = 2) for the Tizgui mine. Variations of the δ98MoNIST occur either at the deposit scale with a difference of about 0.72‰, and at the sample scale (few cm), which exhibits a difference of up to 0.40‰. A multi-phased mineralisation is proposed as the main processes explaining the variation in the δ98MoNIST values although the influence of a Rayleigh fractionation process cannot be precluded. The high δ34S values determined from molybdenite, pyrrhotite, and chalcopyrite (8–14.7‰) suggest a sedimentary origin for sulphur from the Cambrian sedimentary country rocks. Whereas, the initial 206Pb/204Pb compositions of common lead (18.08–18.30) for chalcopyrite and pyrrhotite imply a strong contribution of lead from the host volcano-sedimentary units.

Published
2019

34. Structural and chemical investigation of interface related magnetoelectric effect in Ni/BiFe0.95Mn0.05O3 heterostructures

Author

Christophe Daumont, Pascal Andreazza, Sylvie Schamm-Chardon, Jérôme Wolfman, Thibaud Denneulin, Nazir Jaber, B. Negulescu, GREMAN (matériaux, microélectronique, acoustique et nanotechnologies) (GREMAN - UMR 7347), Université de Tours-Institut National des Sciences Appliquées - Centre Val de Loire (INSA CVL), Institut National des Sciences Appliquées (INSA)-Institut National des Sciences Appliquées (INSA)-Centre National de la Recherche Scientifique (CNRS), Interfaces, Confinement, Matériaux et Nanostructures ( ICMN), Centre National de la Recherche Scientifique (CNRS)-Université d'Orléans (UO), Matériaux et dispositifs pour l'Electronique et le Magnétisme (CEMES-MEM), Centre d'élaboration de matériaux et d'études structurales (CEMES), Université Toulouse III - Paul Sabatier (UT3), Université Fédérale Toulouse Midi-Pyrénées-Université Fédérale Toulouse Midi-Pyrénées-Centre National de la Recherche Scientifique (CNRS)-Institut de Chimie de Toulouse (ICT-FR 2599), Institut de Recherche pour le Développement (IRD)-Université Toulouse III - Paul Sabatier (UT3), Université Fédérale Toulouse Midi-Pyrénées-Université Fédérale Toulouse Midi-Pyrénées-Institut de Chimie du CNRS (INC)-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)-Institut de Chimie du CNRS (INC)-Centre National de la Recherche Scientifique (CNRS)-Institut National Polytechnique (Toulouse) (Toulouse INP), Université Fédérale Toulouse Midi-Pyrénées-Institut National des Sciences Appliquées - Toulouse (INSA Toulouse), Institut National des Sciences Appliquées (INSA)-Institut National des Sciences Appliquées (INSA)-Université Toulouse III - Paul Sabatier (UT3), Institut National des Sciences Appliquées (INSA)-Institut National des Sciences Appliquées (INSA), Institut National des Sciences Appliquées - Centre Val de Loire (INSA CVL), Institut National des Sciences Appliquées (INSA)-Institut National des Sciences Appliquées (INSA)-Université de Tours (UT)-Centre National de la Recherche Scientifique (CNRS), Université d'Orléans (UO)-Centre National de la Recherche Scientifique (CNRS), Institut National Polytechnique (Toulouse) (Toulouse INP), Université Fédérale Toulouse Midi-Pyrénées-Université Fédérale Toulouse Midi-Pyrénées-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-Institut de Chimie du CNRS (INC)-Institut National Polytechnique (Toulouse) (Toulouse INP), Université Fédérale Toulouse Midi-Pyrénées-Centre National de la Recherche Scientifique (CNRS)-Institut de Recherche pour le Développement (IRD)-Institut de Chimie du CNRS (INC)-Institut National des Sciences Appliquées - Toulouse (INSA Toulouse), Université de Tours (UT)-Institut National des Sciences Appliquées - Centre Val de Loire (INSA CVL), 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), 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)-Institut National des Sciences Appliquées - Toulouse (INSA Toulouse), and Université de Toulouse (UT)-Centre National de la Recherche Scientifique (CNRS)

Subjects
Materials science, Photoemission spectroscopy, Magnetoelectric effect, General Physics and Astronomy, 02 engineering and technology, Multiferroic, 010402 general chemistry, 01 natural sciences, Magnetoelectric coupling, Multiferroics, Ferroelectric structure, Condensed matter physics, Electron energy loss spectroscopy, Heterojunction, Surfaces and Interfaces, General Chemistry, Ionic migration, 021001 nanoscience & nanotechnology, Condensed Matter Physics, Ferroelectricity, Exchange coupling, 0104 chemical sciences, Surfaces, Coatings and Films, Reciprocal lattice, Transmission electron microscopy, BiFeO3 thin film, [PHYS.COND.CM-MS]Physics [physics]/Condensed Matter [cond-mat]/Materials Science [cond-mat.mtrl-sci], 0210 nano-technology
Abstract

International audience; The magnetoelectric coupling mechanism in Ni/BiFe0.95Mn0.05O3 heterostructures is investigated through a detailed microstructural study of the BiFe0.95Mn0.05O3 film and a chemical analysis of the Ni/BiFe0.95Mn0.05O3 interface. The four structural variants expected in BiFe0.95Mn0.05O3 are detected by high resolution X-ray diffraction reciprocal space mapping method. The ferroelectric domain structure is imaged with transmission electron microscopy. Oxidized Ni is evidenced at the Ni/BiFe0.95Mn0.05O3 interface by electron energy loss spectroscopy and X-ray photoemission spectroscopy, although the degree of Ni oxidation is independent of the magnetoelectric state of the heterostructure.

Published
2019

35. Distributed deformation along the subduction plate interface: The role of tectonic mélanges

Author

Arito Sakaguchi, Giulia Palazzin, Yujin Kitamura, Romain Augier, Vincent Famin, Asuka Yamaguchi, Hugues Raimbourg, 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), Géodynamique - 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), 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)-Institut national des sciences de l'Univers (INSU - CNRS), Laboratoire GéoSciences Réunion (LGSR), Université de La Réunion (UR)-Institut de Physique du Globe de Paris (IPG Paris), Department of Ocean Floor Geoscience, Ocean Research Institute, The University of Tokyo (UTokyo), Graduate School of Science and Engineering, Kagoshima University, Graduate School of Sciences and Technology for Innovation, University of Yamaguchi, Program 'Sakura' by the French Ministry of Foreign Affairs, ANR-10-LABX-0100,VOLTAIRE,Geofluids and Volatil elements – Earth, Atmosphere, Interfaces – Resources and Environment(2010), European Project: 290864,EC:FP7:ERC,ERC-2011-ADG_20110209,RHEOLITH(2012), Institut national des sciences de l'Univers (INSU - CNRS)-Université d'Orléans (UO)-Bureau de Recherches Géologiques et Minières (BRGM) (BRGM)-Institut des Sciences de la Terre d'Orléans - UMR7327 (ISTO), Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL)-Université d'Orléans (UO)-Centre National de la Recherche Scientifique (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)-Centre National de la Recherche Scientifique (CNRS), Université de La Réunion (UR)-Institut de Physique du Globe de Paris, and University of Kagoshima

Subjects
Underplating, Accretionary wedge, 010504 meteorology & atmospheric sciences, Subduction, Geochemistry, Geology, Slip (materials science), Mélange, 010502 geochemistry & geophysics, 01 natural sciences, Deformation, Pressure solution, Shear (geology), [SDU]Sciences of the Universe [physics], Geochemistry and Petrology, Subduction zones, Shear zone, Rheology, Petrology, Shear band, 0105 earth and related environmental sciences
Abstract

International audience; Recent geophysical monitoring of subduction zones has unraveled a complete spectrum of plate coupling behaviors, from coupled portions rupturing during earthquakes to decoupled portions slipping aseismically. However, the deformation mechanisms and the exhumed rock corresponding to these contrasted behaviors are not yet identified. Tectonic mélange zones are thought to play a major role in the deformation of the plate interface as they represent remnants of the subducted plate scraped off by the overriding plate. In this work we examine several tectonic mélange zones (Hyuga, Okitsu, Mugi) from the Shimanto Belt, an accretionary prism in southwest Japan connecting to the active Nankai subduction zone. These tectonic mélange zones have a block-in-matrix structure, with lenses of sandstones and basalts within a metapelitic matrix, and their deformation is distributed over zones of hundreds of meters in thickness. In addition, the examples of mélange considered here are bounded by sharp faults, some of them bearing pseudotachylyte layers, so that distributed deformation within the mélange and localized deformation on its boundary are juxtaposed. Distributed deformation involves the development of a foliation, as well as of a pervasive network of macroscopic and microscopic shear zones. Along with slip on this network, strain proceeds by fracturing and precipitation of quartz, in long veins parallel to the foliation or in smaller cracks perpendicular to stretching and forming in the neck of competent lenses of sandstones or former quartz veins. The analysis of shear band kinematics shows in all three examples a dominant, top-to-the-trench sense of shear, consistent with deformation along the plate boundary during subduction. Moreover, most shear zones, when foliation is restored back to syn-subduction position, are extensional structures. Finally, the geometry and kinematics of the mélange-bounding faults, as well as radiometric constraints, show that in most cases the faults (=localized structures) were formed during a later stage than mélange internal deformation. These findings bear several consequences on the structure and dynamics of the subduction plate boundary at seismogenic depths. First, there is no support for a model of plate boundary fault zone composed simultaneously of localized slip zones and domains of more distributed deformation. Second, rather than proposed models of underplating, where all deformation is localized into the thrusts bounding the tectonic sheets, we suggest that underplating was to a large extent accommodated by distributed deformation within the mélange sheets. This underplating model accounts for (i) the large amount of strain within the mélange, (ii) the absence of contractional structures during underplating, (iii) thinning of the mélange required by the network of extensional shear bands and stretched boudins. Third, mélanges appear as likely candidates for portions of the plate interface deforming by aseismic slip. The seismic vs. aseismic character of the plate interface might depend on the ability of sediments on top of the subducting plate to undergo distributed strain, which in turn depends on the efficiency of pressure solution to operate.

Published
2019

36. Acute and subacute effects of a synthetic kisspeptin analog, C6, on serum concentrations of luteinizing hormone, follicle stimulating hormone, and testosterone in prepubertal bull calves

Author

V. Aucagne, P.A. Parker, Brian K Whitlock, Massimiliano Beltramo, Ky G Pohler, Elizabeth A Coffman, Jay A Daniel, The University of Tennessee [Knoxville], Louisiana State University (LSU), Berry College, Centre de biophysique moléculaire (CBM), Université d'Orléans (UO)-Institut National de la Santé et de la Recherche Médicale (INSERM)-Centre National de la Recherche Scientifique (CNRS)-Institut de Chimie du CNRS (INC), Physiologie de la reproduction et des comportements [Nouzilly] (PRC), Institut National de la Recherche Agronomique (INRA)-Institut Français du Cheval et de l'Equitation [Saumur]-Université de Tours (UT)-Centre National de la Recherche Scientifique (CNRS), Select Sires, Inc. (Plain City, OH, USA), American Veterinary Medical Foundation (Schaumburg, IL USA), French National Research Agency (Paris, France) [ANR-15-CE20-0015-01], Université d'Orléans (UO)-Institut National de la Santé et de la Recherche Médicale (INSERM)-Centre National de la Recherche Scientifique (CNRS), Centre National de la Recherche Scientifique (CNRS)-Université de Tours-Institut Français du Cheval et de l'Equitation [Saumur]-Institut National de la Recherche Agronomique (INRA), and Institut National de la Recherche Agronomique (INRA)-Institut Français du Cheval et de l'Equitation [Saumur]-Université de Tours-Centre National de la Recherche Scientifique (CNRS)

Subjects
Male, LH, medicine.medical_specialty, Kisspeptin, [SDV]Life Sciences [q-bio], Gonadotropin-releasing hormone, Bull, 03 medical and health sciences, Follicle, Follicle-stimulating hormone, 0302 clinical medicine, Food Animals, Internal medicine, FSH, Animals, Medicine, Testosterone, [SDV.BBM]Life Sciences [q-bio]/Biochemistry, Molecular Biology, Sexual Maturation, Small Animals, Kisspeptins, Compound 6, 030219 obstetrics & reproductive medicine, Equine, business.industry, Puberty, 0402 animal and dairy science, Radioimmunoassay, 04 agricultural and veterinary sciences, Luteinizing Hormone, 040201 dairy & animal science, 3. Good health, Endocrinology, Cattle, Animal Science and Zoology, Follicle Stimulating Hormone, business, Luteinizing hormone, Hormone
Abstract

International audience; Kisspeptin (KP) is a neuropeptide integral in regulating puberty and gonadotropin releasing hormone. Compound 6 (C6), a KP analog, is more potent in vitro, has a longer half-life, and may have greater therapeutic applications than KP. To determine the acute and subacute effects of KP and C6 on serum concentrations of luteinizing hormone (LH), follicle stimulating hormones (FSH), and testosterone (T), prepubertal bull calves [12.1 ± 1.1 (SD) weeks of age; 91.2 ± 10.8 kg BW] were assigned to one of three treatment groups [Saline (n = 4), KP (n = 4; 20 nmoles), or C6 (n = 4; 20 nmoles). Treatments were administered intramuscularly once daily for four consecutive days. Blood samples were collected every 15 min for 6 h immediately following treatment administration on Day 1 (acute) and Day 4 (subacute). Serum concentrations of LH, FSH, and T were determined by radioimmunoassay. For each day, effects of treatment, time, and interactions on LH and FSH concentrations and pulse parameters were analyzed using procedures for repeated measures with JMP Software (SAS Inst. Inc., Cary, NC). There was a treatment × time interaction during Day 1 (P

Published
2019

37. Microstructure of nanocomposite wurtzite-spinel (Fe:ZnO)-(Zn:Fe3O4) epitaxial films

Author

Xavier Portier, Eric Millon, Christophe Cachoncinlle, Christian Hebert, M. Nistor, Jacques Perriere, E. Briand, N. Jedrecy, Centre de recherche sur les Ions, les MAtériaux et la Photonique (CIMAP - UMR 6252), Centre National de la Recherche Scientifique (CNRS)-École Nationale Supérieure d'Ingénieurs de Caen (ENSICAEN), Normandie Université (NU)-Normandie Université (NU)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université de Caen Normandie (UNICAEN), Normandie Université (NU), Institut des Nanosciences de Paris (INSP), Université Pierre et Marie Curie - Paris 6 (UPMC)-Centre National de la Recherche Scientifique (CNRS), Groupe de recherches sur l'énergétique des milieux ionisés (GREMI), Centre National de la Recherche Scientifique (CNRS)-Université d'Orléans (UO), Université d'Orléans (UO)-Centre National de la Recherche Scientifique (CNRS), 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)-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), and Institut National des Sciences Appliquées (INSA)-Normandie Université (NU)-Institut National des Sciences Appliquées (INSA)-Centre National de la Recherche Scientifique (CNRS)

Subjects
Nanocomposite, Materials science, Spinel, 02 engineering and technology, engineering.material, 010402 general chemistry, 021001 nanoscience & nanotechnology, Condensed Matter Physics, Microstructure, Rutherford backscattering spectrometry, Epitaxy, 01 natural sciences, 0104 chemical sciences, Crystallography, [PHYS.COND.CM-MS]Physics [physics]/Condensed Matter [cond-mat]/Materials Science [cond-mat.mtrl-sci], engineering, Sapphire, General Materials Science, Crystallite, 0210 nano-technology, ComputingMilieux_MISCELLANEOUS, Wurtzite crystal structure
Abstract

Pulsed-laser ablation of zinc and iron-based oxide targets leads to the growth on c-cut sapphire substrates of nanocomposite films constituted by randomly distributed wurtzite (Fe:ZnO) and spinel (Zn:Fe3O4) phases. By the complementary use of Rutherford backscattering spectrometry, X-ray diffraction and transmission electron microscopy, the nature and composition of the phases, their structure and microstructure were investigated. Both phases are textured, (0001) and (111) for the wurtzite and spinel, respectively. The epitaxial relationships with the sapphire substrate were determined: the wurtzite crystallites present the classical 30° rotation of the hexagon of their (0001) plane with respect to the hexagon of the (000l) Al2O3 plane. The spinel crystallites show two in-plane orientations, one corresponding to the 30° rotation of the hexagon of their (111) planes, the other one being at 0°. These two in-plane epitaxial orientations were observed for spinel crystallites directly grown on (000l) Al2O3 as well as for spinel crystallites inside the nanocomposite films. They are shown to be related to differences in the Zn concentration inside the spinel. A high Zn concentration (>33%) leads to the hexagon on hexagon 0° epitaxy while a lower concentration leads to the 30° rotation. This lead us to conclude in differences in the epitaxy of the inverse spinel (low Zn concentration in the crystallite) and of the normal spinel (high Zn concentration).

Published
2019

38. Sunlight photoactivity of rice husks-derived biogenic silica

Author

Conchi O. Ania, José J. Calvino, Fabiano R. Praxedes, Enrique Rodríguez-Castellón, Po S. Poon, Juan Matos, Juan C. Hernández-Garrido, María C. Fernández de Córdoba, Silvania Lanfredi, Ricmary Montaña, Elena Rodríguez-Aguado, University of Concepcion, Univ. Orleans, Millenium Nuclei on Catalytic Processes towards Sustainable Chemistry (CSC), Universidade Estadual Paulista (Unesp), University of Cadiz, University of Malaga, Universidad de Concepción [Chile], Conditions Extrêmes et Matériaux : Haute Température et Irradiation (CEMHTI), Centre National de la Recherche Scientifique (CNRS)-Institut de Chimie du CNRS (INC)-Université d'Orléans (UO), Université d'Orléans (UO), Universidade Estadual Paulista Júlio de Mesquita Filho = São Paulo State University (UNESP), Universidad de Cádiz (UCA), and Universidad de Málaga [Málaga] = University of Málaga [Málaga]

Subjects
Reaction mechanism, Rhodamine B, 02 engineering and technology, Biogenic silica, 010402 general chemistry, 01 natural sciences, 7. Clean energy, Catalysis, law.invention, chemistry.chemical_compound, law, Rice husks, Calcination, Artificial solar light, Photocatalysis, ComputingMilieux_MISCELLANEOUS, [CHIM.MATE]Chemical Sciences/Material chemistry, General Chemistry, 021001 nanoscience & nanotechnology, 0104 chemical sciences, chemistry, 13. Climate action, Degradation (geology), 0210 nano-technology, Mesoporous material, Nuclear chemistry
Abstract

Made available in DSpace on 2019-10-06T15:27:11Z (GMT). No. of bitstreams: 0 Previous issue date: 2019-05-15 Federación Española de Enfermedades Raras Fondo Nacional de Desarrollo Científico y Tecnológico Carbon-containing SiO 2 -based photocatalysts were prepared by the solvothermal treatment of rice husk as biogenic precursor in the presence and absence of TiO 2 and used for the photocatalytic degradation of rhodamine-B under simulated solar light. Data showed that the prepared catalysts are mainly composed of biogenic silica and displayed mesoporous character with surface areas ranging from 65 to 174 m 2 g -1 . The obtained materials showed photocatalytic activity comparable to that of commercial TiO 2 -P25 powders for the degradation of rhodamine-B under sunlight. The calcination at 350 °C improved the photocatalytic activity of the biogenic precursor by three times in the absence of TiO 2 . At converse, calcination of sample SiO 2 -TiO 2 decreased the photoactivity due to the appearance of non-photoactive TiSiO 4 crystalline phases in the catalyst, as inferred by XRD and XPS. A reaction mechanism for rhodamine-B degradation excluding the deethylation pathway has been proposed, based on the evolution of the absorbance spectra of rhodamine-B upon the photocatalytic tests. Bioenergy Department Technological Development Unit University of Concepcion CEMHTI CNRS (UPR 3079) Univ. Orleans Millenium Nuclei on Catalytic Processes towards Sustainable Chemistry (CSC) São Paulo State University (Unesp) Laboratory LaCCeF Department of Materials Science and Metallurgy Engineering and Inorganic Chemistry Faculty of Sciences University of Cadiz Inorganic Chemistry Department Faculty of Science University of Malaga São Paulo State University (Unesp) Laboratory LaCCeF

Published
2019

39. Study of the NaF-ScF3 system as a molten bath for production of Sc alloys: A combination of NMR and molecular dynamics simulations

Author

Kelly Machado, Ilya B. Polovov, Didier Zanghi, Konstantin Maksimtsev, Catherine Bessada, Aydar Rakhmatullin, Rinat Bakirov, Conditions Extrêmes et Matériaux : Haute Température et Irradiation (CEMHTI), Centre National de la Recherche Scientifique (CNRS)-Institut de Chimie du CNRS (INC)-Université d'Orléans (UO), Université d'Orléans (UO), Ural Federal University [Ekaterinburg] (UrFU), and Izhevsk State Technical University

Subjects
MOLTEN SALTS, Materials science, MOLECULAR DYNAMICS SIMULATIONS, SCANDIUM ALLOYS, Thermodynamics, Ionic bonding, Interatomic potential, FLUORINE COMPOUNDS, 02 engineering and technology, Molecular Dynamics, 010402 general chemistry, DFT, 7. Clean energy, 01 natural sciences, SCANDIUM COMPOUNDS, SODIUM COMPOUNDS, Molecular dynamics, High temperature NMR, Materials Chemistry, DENSITY FUNCTIONAL THEORY, Spectroscopy, COMPUTATIONAL PROTOCOLS, scandium fluorides, NMR CHEMICAL SHIFTS, Mechanical Engineering, Chemical shift, molten salts, NUCLEAR MAGNETIC RESONANCE SPECTROSCOPY, POTENTIAL PARAMETERS, Metals and Alloys, COMPUTATION THEORY, [CHIM.MATE]Chemical Sciences/Material chemistry, Nuclear magnetic resonance spectroscopy, 021001 nanoscience & nanotechnology, SCANDIUM FLUORIDES, ELECTRICAL CONDUCTIVITY, 0104 chemical sciences, NMR spectra database, HIGH-TEMPERATURE NMR, Mechanics of Materials, MOLTEN SALT, DFT 1, MOLECULAR DYNAMICS, INTERATOMIC POTENTIAL, Density functional theory, HIGH TEMPERATURE NMR, 0210 nano-technology
Abstract

International audience; In situ high temperature NMR spectroscopy was used to characterize the NaF-ScF3 melt over a wide range of compositions. 19 F, 23 Na, and 45 Sc NMR spectra were acquired in NaF-ScF3 melts of up to 70 mol% of ScF3. The interpretation of all experimental results obtained in situ in the melt is significantly enhanced by the contribution of Molecular Dynamics (MD) calculations. A new interatomic potential for the molten NaF-ScF3 system was developed by using a Polarizable Ion Model (PIM). The potential parameters were obtained by force-fitting to density functional theory (DFT) reference data. MD simulations were combined with further DFT calculations to determine NMR chemical shifts for 19 F, 23 Na, and 45 Sc. The agreement between the experimental NMR data and the corresponding calculated data from our applied computational protocol indicated the polymerization and network formation in the melt. Additionally, the density and the electrical conductivity in the molten state were calculated from the statistical analysis of ionic trajectories obtained through MD simulations.

Published
2019

40. Combining solid state NMR, powder X-ray diffraction, and DFT calculations for CsSc3F10 structure determination

Author

Catherine Bessada, Andrey V. Chukin, Mathieu Allix, Dmitry S. Maltsev, Rinat Bakirov, Aydar Rakhmatullin, Ilya B. Polovov, Conditions Extrêmes et Matériaux : Haute Température et Irradiation (CEMHTI), Centre National de la Recherche Scientifique (CNRS)-Institut de Chimie du CNRS (INC)-Université d'Orléans (UO), Université d'Orléans (UO), Ural Federal University [Ekaterinburg] (UrFU), and Izhevsk State Technical University

Subjects
Diffraction, Materials science, Coordination number, CRYSTALLINE STRUCTURE, chemistry.chemical_element, 02 engineering and technology, Crystal structure, 010402 general chemistry, 01 natural sciences, X-ray, COORDINATION NUMBER, CASTEP, Phase (matter), Materials Chemistry, DENSITY FUNCTIONAL THEORY, Scandium, FIRST-PRINCIPLES CALCULATION, POWDER X RAY DIFFRACTION, Mechanical Engineering, NUCLEAR MAGNETIC RESONANCE SPECTROSCOPY, Metals and Alloys, [CHIM.MATE]Chemical Sciences/Material chemistry, 021001 nanoscience & nanotechnology, SOLID-STATE NMR, 0104 chemical sciences, CALCULATIONS, X RAYS, Solid-state nuclear magnetic resonance, chemistry, Mechanics of Materials, X-ray crystallography, X-RAY, X RAY DIFFRACTION, solid-state NMR, Physical chemistry, FIRST PRINCIPLES, 0210 nano-technology, SOLID STATE NMR, STRUCTURE DETERMINATION, LIGHT POLARIZATION
Abstract

International audience; A combination of high field solid-state MAS NMR spectroscopy, X-ray diffraction, and firstprinciples calculations is used to elucidate the crystalline structure of CsSc3F10. At room temperature, this phase was found to crystallize in the Pmma (n°51) space group with a = 8.0837(1) Å, b = 7.5764(1) Å, and c = 6.8127(1) Å. The remarkable feature of CsSc3F10 is an unusual high cesium coordination number of 18. 45 Sc-19 F D-HMQC NMR method has been employed to investigate the connectivity of scandium with fluorine atoms. NMR parameters were determined using first principle DFT calculations and compared with experimentally obtained data.

Published
2019

41. Ozone-assisted combustion of hydrogen: A comparison with isooctane

Author

Fabrice Foucher, Guillaume Dayma, P. Dagaut, Jean-Baptiste Masurier, Nicolas Seignour, Bengt Johansson, Laboratoire pluridisciplinaire de recherche en ingénierie des systèmes, mécanique et énergétique (PRISME), Université d'Orléans (UO)-Institut National des Sciences Appliquées - Centre Val de Loire (INSA CVL), Institut National des Sciences Appliquées (INSA)-Institut National des Sciences Appliquées (INSA), King Abdullah University of Science and Technology (KAUST), Institut de Combustion, Aérothermique, Réactivité et Environnement (ICARE), Université d'Orléans (UO)-Centre National de la Recherche Scientifique (CNRS)-Institut des Sciences de l'Ingénierie et des Systèmes (INSIS), and ANR-15-CE22-0004,CICCO,Combustion Initiée par Compression Contrôlée par Ozone(2015)

Subjects
Ozone, Hydrogen, Energy Engineering and Power Technology, chemistry.chemical_element, 02 engineering and technology, 010402 general chemistry, Combustion, 01 natural sciences, 7. Clean energy, chemistry.chemical_compound, HCCI, Unburned hydrocarbon, engine, Renewable Energy, Sustainability and the Environment, [SPI.FLUID]Engineering Sciences [physics]/Reactive fluid environment, Homogeneous charge compression ignition, Particulates, 021001 nanoscience & nanotechnology, Condensed Matter Physics, 0104 chemical sciences, [CHIM.THEO]Chemical Sciences/Theoretical and/or physical chemistry, Isooctane, Fuel Technology, chemistry, Chemical engineering, 13. Climate action, Environmental science, 0210 nano-technology, Carbon, combustion, Carbon monoxide
Abstract

International audience; Homogeneous Charge Compression Ignition (HCCI) engines have the potential to achieve low emissions of nitrogen oxides and particulate matter but the use of carbon-based fuels leads to significant emissions of carbon monoxide and unburned hydrocarbon which hinder the widespread development of HCCI. Nonetheless, HCCI engines have also the potential to use various types of fuel such as hydrogen, a carbon free fuel. The present study examined hydrogen combustion in an HCCI engine comparing hydrogen with isooctane. The sensitivities of CA05, CA50 and ringing intensity to intake pressure, intake temperature and ozone were investigated for both fuels. Results highlighted that hydrogen autoignites more easily than isooctane despite its higher-octane number. Ozone seeding was therefore used to shift the combustion region of isooctane in order to perform a viable comparison between the two fuels while starting with the same initial conditions. From this point, all of the three parameters were found to promote the HCCI combustion of both fuels but greater sensitivities were observed for hydrogen than for isooctane. Ozone was observed to have the strongest influence, making it a good strategy for a future control approach. The noise level of hydrogen was very high due its high reactivity. Finally, the use of hydrogen together with ozone should enable a very clean engine cycle to be achieved cycle with only water and nitrogen as engine-out emissions.

Published
2019

42. Influence of laser peening without coating on microstructure and fatigue limit of Ti-15V-3Al-3Cr-3Sn

Author

Mohan Ranganathan, S. Sudhagara Rajan, Sathya Swaroop, Geetha Manivasagam, Mécanique des Matériaux et Procédés (MMP), Laboratoire de Mécanique Gabriel Lamé (LaMé), Université d'Orléans (UO)-Université de Tours-Institut National des Sciences Appliquées - Centre Val de Loire (INSA CVL), Institut National des Sciences Appliquées (INSA)-Institut National des Sciences Appliquées (INSA)-Université d'Orléans (UO)-Université de Tours-Institut National des Sciences Appliquées - Centre Val de Loire (INSA CVL), Institut National des Sciences Appliquées (INSA)-Institut National des Sciences Appliquées (INSA), Université d'Orléans (UO)-Institut National des Sciences Appliquées - Centre Val de Loire (INSA CVL), Institut National des Sciences Appliquées (INSA)-Institut National des Sciences Appliquées (INSA)-Université de Tours (UT)-Université d'Orléans (UO)-Institut National des Sciences Appliquées - Centre Val de Loire (INSA CVL), and Institut National des Sciences Appliquées (INSA)-Institut National des Sciences Appliquées (INSA)-Université de Tours (UT)

Subjects
010302 applied physics, Materials science, Laser peening, Peening, Fractography, 02 engineering and technology, [PHYS.MECA.MSMECA]Physics [physics]/Mechanics [physics]/Materials and structures in mechanics [physics.class-ph], 021001 nanoscience & nanotechnology, 01 natural sciences, Fatigue limit, Atomic and Molecular Physics, and Optics, Electronic, Optical and Magnetic Materials, [PHYS.MECA.MEMA]Physics [physics]/Mechanics [physics]/Mechanics of materials [physics.class-ph], [PHYS.MECA.STRU]Physics [physics]/Mechanics [physics]/Structural mechanics [physics.class-ph], Residual stress, [PHYS.MECA.SOLID]Physics [physics]/Mechanics [physics]/Solid mechanics [physics.class-ph], 0103 physical sciences, Surface roughness, Electrical and Electronic Engineering, Composite material, 0210 nano-technology, ComputingMilieux_MISCELLANEOUS, Electron backscatter diffraction, Stress concentration
Abstract

In the present study, Ti-15V-3Al-3Cr-3Sn (Ti-15-3), a beta titanium aerospace alloy in solution treated condition (850 °C/1 h) was subjected to Laser Peening without Coating (LPwC) with a wavelength of 532 nm and power density of 8.96 GW cm−2. Surface roughness was analysed using 3D optical topography. Curiously, in the near peened surface, peening induced precipitation (i.e. 19% of α precipitation) and increased fraction of low angle boundaries (∼123%) was revealed through the Electron Back Scattered Diffraction (EBSD) analysis. Through depth nanohardness measurement was carried out along the cross-section of the peened sample right from the near peened surface. Peak hardness of 4.6 GPa is observed at a depth of 100 µm from the peened surface while the base/bulk hardness of the material is 4 GPa. In addition, X-Ray Diffraction (XRD) based analysis confirmed the presence of compressive residual stress in the near surface region of the peened sample. To understand the effect of the peening induced microstructural changes and residual stresses in fatigue behaviour, staircase method of fatigue analysis was adopted and observed that the more number of run out samples belonged to laser peened condition when compared to the unpeened condition. Despite this favourable indication, fatigue limit remains more or less unaltered even after peening. Fractography studies revealed the least influence of the surface roughness induced by laser peening over the crack initiation. Irrespective of the condition (i.e. unpeened and laser peened), crack initiation was predominantly influenced by the stress concentration co-existing at the sharp corners.

Published
2019

43. Hydrogen dispersion in a closed environment

Author

M. De Stefano, N. Daudey, X. Rocourt, Isabelle Sochet, Laboratoire Pluridisciplinaire de Recherche en Ingénierie des Systèmes, Mécanique et Energétique (PRISME), Université d'Orléans (UO)-Ecole Nationale Supérieure d'Ingénieurs de Bourges (ENSI Bourges), Laboratoire Énergétique Explosions Structures [1998-2007] (LEES), Université d'Orléans (UO), Laboratoire pluridisciplinaire de recherche en ingénierie des systèmes, mécanique et énergétique (PRISME), Université d'Orléans (UO)-Institut National des Sciences Appliquées - Centre Val de Loire (INSA CVL), Institut National des Sciences Appliquées (INSA)-Institut National des Sciences Appliquées (INSA), and Rocourt, Xavier

Subjects
Leak, Hydrogen, Enclosure, Energy Engineering and Power Technology, chemistry.chemical_element, 02 engineering and technology, 010402 general chemistry, 01 natural sciences, 7. Clean energy, Thermal conductivity, Schlieren, ComputingMilieux_MISCELLANEOUS, Leakage (electronics), Flammability, Renewable Energy, Sustainability and the Environment, [SPI.FLUID]Engineering Sciences [physics]/Reactive fluid environment, [SPI.FLUID] Engineering Sciences [physics]/Reactive fluid environment, Mechanics, 021001 nanoscience & nanotechnology, Condensed Matter Physics, 0104 chemical sciences, Fuel Technology, chemistry, 13. Climate action, Environmental science, 0210 nano-technology, Scale model
Abstract

The highly combustible nature of hydrogen poses a great hazard, creating a number of problems with its safety and handling. As a part of safety studies related to the use of hydrogen in a confined environment, it is extremely important to have a good knowledge of the dispersion mechanism. The present work investigates the concentration field and flammability envelope from a small scale leak. The hydrogen is released into a 0.47 m × 0.33 m x 0.20 m enclosure designed as a 1/15 – scale model of a room in a nuclear facility. The performed tests evaluates the influence of the initial conditions at the leakage source on the dispersion and mixing characteristics in a confined environment. The role of the leak location and the presence of obstacles, are also analyzed. Throughout the test, during the release and the subsequent dispersion phase, temporal profiles of hydrogen concentration are measured using thermal conductivity gauges within the enclosure. In addition, the BOS (Background Oriented Schlieren) technique is used to visualise the cloud evolution inside the enclosure. These instruments allow the observation and quantification of the stratification effects.

Published
2019

44. Enhanced production of lignans and neolignans in chitosan-treated flax (Linum usitatissimum L.) cell cultures

Author

Christophe Hano, Adnan Zahir, Sullivan Renouard, Laurine Garros, Joël Doussot, Nathalie Giglioli-Guivarc'h, Waqar Ahmad, Samantha Drouet, Bilal Haider Abbasi, Muhammad Nadeem, Quaid-i-Azam University (QAU), Laboratoire de Biologie des Ligneux et des Grandes Cultures (LBLGC), Université d'Orléans (UO)-Institut National de Recherche pour l’Agriculture, l’Alimentation et l’Environnement (INRAE), COSM'ACTIFS - Bioactifs et Cosmétiques, Université d'Orléans (UO)-Institut de Chimie du CNRS (INC)-Centre National de la Recherche Scientifique (CNRS), Institut de Chimie Organique et Analytique (ICOA), Université d'Orléans (UO)-Centre National de la Recherche Scientifique (CNRS)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Institut de Chimie du CNRS (INC)-Institut National de la Santé et de la Recherche Médicale (INSERM), Conservatoire National des Arts et Métiers [CNAM] (CNAM), Biomolécules et biotechnologies végétales (BBV EA 2106), Université de Tours (UT), CCSD, Accord Elsevier, Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université d'Orléans (UO)-Institut National de la Santé et de la Recherche Médicale (INSERM)-Institut de Chimie du CNRS (INC)-Centre National de la Recherche Scientifique (CNRS), Institut National de la Recherche Agronomique (INRA)-Université d'Orléans (UO), HESAM Université - Communauté d'universités et d'établissements Hautes écoles Sorbonne Arts et métiers université (HESAM), Institut de Chimie du CNRS (INC)-Centre National de la Recherche Scientifique (CNRS)-Université d'Orléans (UO), and Université de Tours

Subjects
0106 biological sciences, Linum, Antioxidant, [SDV]Life Sciences [q-bio], medicine.medical_treatment, Bioengineering, Linum usitatissimum, 01 natural sciences, Applied Microbiology and Biotechnology, Biochemistry, Lignans, Chitosan, 03 medical and health sciences, chemistry.chemical_compound, Glucoside, Biosynthesis, 010608 biotechnology, medicine, 030304 developmental biology, Lariciresinol, 0303 health sciences, biology, Elicitation, biology.organism_classification, Secoisolariciresinol diglucoside, [SDV] Life Sciences [q-bio], chemistry, Neolignans, Cell culture, Monolignol
Abstract

International audience; Linum usitatissimum is a source of pharmacologically active lignans and neolignans. An effective protocol has been established for the enhanced biosynthesis of lignans and neolignans in cell cultures of Linum usitatissimum by using chitosan addition. Gene expression analysis of monolignols (PAL, CCR and CAD), lignans (DIR, PLR and UGT) and neolignans (PCBER) biosynthetic genes by RT-qPCR as well as monolignol biosynthetic PAL, CCR and CAD enzyme activities evidenced a stimulation following chitosan treatment. Validated reverse phase high-performance liquid chromatography coupled to diode array detection was used to quantify secoisolariciresinol diglucoside (SDG) and lariciresinol diglucoside (LDG), dehydrodiconiferyl alcohol glucoside (DCG) and guaiacylglycerol-β-coniferyl alcohol ether glucoside (GGCG) showed that chitosan treated cell cultures had better accumulation of these metabolites. Maximum enhancements of 7.3-fold (28 mg/g DW) occurred for LDG, 3.5-fold (58.85 mg/g DW) in DCG and while the least enhancement of 2-fold (18.42 mg/g DW) for SDG was observed in 10 mg/l chitosan treated cell cultures than to controls. Furthermore, same concentration of chitosan also resulted in 1.3-fold increase in antioxidant activity. Compared to the lignans and neolignans accumulations observed in wild type and RNAi-PLR transgenic flaxseeds, chitosan-treated cell cultures appeared to be a very effective production system for these compounds.

Published
2019

45. Atmospheric initiated oxidation of short chain aliphatic ethers

Author

Jianqiang Zhu, Lin Du, Narcisse T. Tsona, Abdelwahid Mellouki, Shandong University, Institut de Combustion, Aérothermique, Réactivité et Environnement (ICARE), Université d'Orléans (UO)-Centre National de la Recherche Scientifique (CNRS)-Institut des Sciences de l'Ingénierie et des Systèmes (INSIS), 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), National Natural Science Foundation of China (91644214), Shandong Natural Science Fund for Distinguished Young Scholars (JQ201705), and Shandong Key R&D Program (2018GSF117040)

Subjects
[SDE.MCG]Environmental Sciences/Global Changes, DIMETHYL ETHER, DIETHYL-ETHER, NO3 RADICALS, General Physics and Astronomy, Ether, HYDROXYL RADICALS, 02 engineering and technology, 010402 general chemistry, Mass spectrometry, 01 natural sciences, chemistry.chemical_compound, RATE CONSTANTS, Reaction rate constant, Chain (algebraic topology), [CHIM]Chemical Sciences, Organic chemistry, Dimethyl ether, Physical and Theoretical Chemistry, GAS-PHASE REACTIONS, OH RADICAL REACTIONS, 021001 nanoscience & nanotechnology, 0104 chemical sciences, chemistry, 13. Climate action, RATE COEFFICIENTS, CL ATOMS, Diethyl ether, 0210 nano-technology, TERT-BUTYL ETHER
Abstract

International audience; The reactions of two selected ethers, methyl n-butyl ether (MnBE) and methyl s-butyl ether (MsBE), with three atmospheric oxidants (OH/NO3/Cl) have been investigated at 298 +/- 2 K using the relative rate method and gas chromatography-mass spectrometry. The reaction trends of these short chain aliphatic ethers with the different oxidants have been discussed. From the obtained results, the reaction with OH is the main tropospheric loss process for MnBE and MsBE, with lifetimes of 19.2 h and 26.8 h, respectively. These short lifetimes indicate that the chemistry of these aliphatic ethers is important in areas close to their emission sources.

Published
2019

46. Measuring network systemic risk contributions: A leave-one-out approach

Author

Yannick Lucotte, Sessi Tokpavi, Sullivan Hué, Laboratoire d'Économie d'Orleans (LEO), Université d'Orléans (UO)-Université de Tours-Centre National de la Recherche Scientifique (CNRS), Paris School of Business (PSB), Laboratoire d'Économie d'Orleans [FRE2014] (LEO), and Université d'Orléans (UO)-Université de Tours (UT)-Centre National de la Recherche Scientifique (CNRS)

Subjects
Economics and Econometrics, Control and Optimization, Financial networks, Financial institution, Sample (statistics), Business model, Interconnectedness, [SHS]Humanities and Social Sciences, Granger causality, 0502 economics and business, Systemic risk, Econometrics, Economics, 050207 economics, Spurious relationship, ComputingMilieux_MISCELLANEOUS, 050205 econometrics, Measure (data warehouse), 050208 finance, Applied Mathematics, 05 social sciences, 1. No poverty, [SHS.ECO]Humanities and Social Sciences/Economics and Finance, Ranking, Financial crisis, Profitability index
Abstract

Granger-causality measures of interconnectedness between financial institutions are useful indicators of systemic risk (Billio et al., 2012) [Journal of Financial Economics], as they help in evaluating how far the distress of one institution is disseminated across the whole of the financial system through networks. This article provides a critical assessment of Granger-causality networks, showing that they can lead to inconsistent measures of systemic risk contributions because of the presence of spurious causalities arising from indirect contagion effects. The traditional solutions for controlling for these effects using inference on conditional Granger-causality lead to the curse of dimensionality though. To solve this, we provide a measure of financial network systemic risk contributions that is based on the leave-one-out (LOO) concept. For a given financial institution, the new measure evaluates how far the total number of significant Granger-causalities breaks down when this institution is excluded from the system. We control for spurious causalities between the remaining institutions due to the indirect contagion effect of the excluded financial institution using a conditional Granger-causality test, which is free of the curse of dimensionality. Empirical applications are conducted using daily market returns for a sample of the world’s largest banks. The results show that our measure gives a meaningful ranking of the systemic importance of financial institutions that is consistent with the ranking of global systemically important banks (G-SIBs) provided by the Financial Stability Board (FSB). Moreover, our measure is shown to be a robust and significant early-warning indicator of large losses from a systemic event, and is strongly driven by balance-sheet variables related to size, business model and profitability.

Published
2019

47. Photochemical reaction playing a key role in particulate matter pollution over Central France: Insight from the aerosol optical properties

Author

Abdelwahid Mellouki, Ying Chen, Yu Wang, Dawei Hu, Chenjie Yu, Véronique Daële, Mahmoud Idir, Jinhe Wang, Institut de Combustion, Aérothermique, Réactivité et Environnement (ICARE), Université d'Orléans (UO)-Centre National de la Recherche Scientifique (CNRS)-Institut des Sciences de l'Ingénierie et des Systèmes (INSIS - CNRS), School of Earth and Environmental Sciences [Manchester] (SEES), University of Manchester [Manchester], 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), Lancaster Environment Centre, Lancaster University, School of Municipal and Environmental Engineering, Shandong Jianzhu University, ARD-PIVOTS Program supported by the Conseil Régional du Centre Val de Loire - France, ANR-10-LABX-0100,VOLTAIRE,Geofluids and Volatil elements – Earth, Atmosphere, Interfaces – Resources and Environment(2010), European Project: PIRSES-GA 2011,AMIS, and Université d'Orléans (UO)-Centre National de la Recherche Scientifique (CNRS)-Institut des Sciences de l'Ingénierie et des Systèmes (INSIS)

Subjects
Pollution, Environmental Engineering, 010504 meteorology & atmospheric sciences, Single-scattering albedo, media_common.quotation_subject, Photochemical reactions Optical properties Size distribution Orleans-France Secondary formation, 010501 environmental sciences, 15. Life on land, Particulates, Radiative forcing, Photochemistry, 01 natural sciences, Aerosol, [SDU]Sciences of the Universe [physics], 13. Climate action, [SDE]Environmental Sciences, Environmental Chemistry, Mass concentration (chemistry), Environmental science, Waste Management and Disposal, Air quality index, Air mass, 0105 earth and related environmental sciences, media_common
Abstract

Atmospheric particle is one of the major air pollutants, and believed to be important for air quality, radiative forcing and climate. Measurements of aerosol optical properties, size distribution and PM10 concentration were conducted at Orleans, central France during spring (7 March to 25 April) and autumn (25 October to 5 December) 2013. The average values of aerosol scattering coefficient (b(sca)), absorption coefficient (b(abs)), single scattering albedo (SSA) at 532 nm and PM10 concentration are 54.9 +/- 58.2 Mm(-1), 10.6 +/- 10.9 Mm(-1), 0.81 +/- 0.10 and 30.6 +/- 21.6 mu g/m(3) for the spring campaign, and 35.4 +/- 36.7 Mm(-1), 3.9 +/- 4.4 Mm(-1), 0.83 +/- 0.13 and 17.4 +/- 11.8 mu g/m(3) for the autumn campaign, respectively. During the whole observation, the air parcel transported from Atlantic Ocean plays a role in cleaning up the ambient air in Orleans, while the air mass coining from the Eastern Europe induces the pollution events in Orleans. In this study, a simple approach, which based on the diurnal variation of PM10 concentration, Boundary layer depth (BLD) and the human activity factor derived from anthropogenic emission rate, was introduced to estimate the contribution of secondary aerosol to ambient aerosols. Our results show that secondary particles formation trigged by photochemical reactions and oxidations can contribute maximum of 64% and 32% for PM10 mass concentration during the spring and autumn time, respectively. These results highlight that photochemical reactions can enhance the atmospheric oxidation capacity and may faster the secondary particle formation and then play an important role in air quality. (C) 2018 Elsevier B.V. All rights reserved.

Published
2019

48. Improved histidinylated lPEI polyplexes for skeletal muscle cells transfection

Author

Jean-Pierre Gomez, Guillaume Tresset, Patrick Midoux, Chantal Pichon, Centre de biophysique moléculaire (CBM), Université d'Orléans (UO)-Institut National de la Santé et de la Recherche Médicale (INSERM)-Centre National de la Recherche Scientifique (CNRS)-Institut de Chimie du CNRS (INC), Laboratoire de Physique des Solides (LPS), Université Paris-Saclay-Centre National de la Recherche Scientifique (CNRS), Université d'Orléans (UO)-Institut National de la Santé et de la Recherche Médicale (INSERM)-Institut de Chimie du CNRS (INC)-Centre National de la Recherche Scientifique (CNRS), and CCSD, Accord Elsevier

Subjects
Polymers, [SDV]Life Sciences [q-bio], Muscle Fibers, Skeletal, Skeletal muscle, Pharmaceutical Science, 02 engineering and technology, Transfection, 030226 pharmacology & pharmacy, Cell Line, Flow cytometry, Myoblasts, Mice, 03 medical and health sciences, chemistry.chemical_compound, 0302 clinical medicine, In vivo, medicine, Animals, Humans, Polyethyleneimine, Myocyte, Histidine, DNA transfection, Cytotoxicity, Muscle Cells, Polyethylenimine, medicine.diagnostic_test, Cytotoxins, Chemistry, Gene Transfer Techniques, DNA, 021001 nanoscience & nanotechnology, In vitro, [SDV] Life Sciences [q-bio], medicine.anatomical_structure, Non-viral vector, NIH 3T3 Cells, Biophysics, 0210 nano-technology
Abstract

International audience; Linear Polyethylenimine (lPEI) is an efficient cationic polymer for transfecting cells, both in vitro and in vivo, but poses concerns regarding cytotoxicity. Histidinylated lPEI (His-lPEI) exhibits also high transfection efficiency but lower cytotoxicity than lPEI. For the first time, we tested polyfection efficiency of polyplexes comprising both lPEI and His-lPEI. A series of pDNA polyplexes was prepared with mixtures of lPEI and His-lPEI and the amount of each polymer within His-lPEI/lPEI polyplexes was determined by flow cytometry. We show that His-lPEI/lPEI polyplexes exhibit properties similar to lPEI polyplexes in terms of size, morphology, assembly with pDNA, and polyplex stability while His-lPEI/lPEI polyplexes exhibit properties similar to His-lPEI polyplexes in terms of buffering capacity. Compared to polyplexes consisting only of lPEI or His-lPEI, the transfection profile reveals that His-lPEI/lPEI polyplexes containing 30% to 57% lPEI strongly increase polyfection efficiency of NIH3T3 fibroblasts and murine, as well as human skeletal muscle cell lines without cytotoxicity. Importantly, improved transfection of human dystrophin deficient skeletal muscle cell lines was obtained. These results indicate that His-lPEI/lPEI polyplexes are an improved non-viral vector for efficient transfection of dystrophin deficient skeletal muscle cell lines that should be tested on animals.

Published
2019

49. Dating the palaeolithic footprints of ‘Le Rozel’ (Normandy, France)

Author

Virginie Moineau, Norbert Mercier, Sebastian Kreutzer, Loïc Martin, Dominique Cliquet, IRAMAT-Centre de recherche en physique appliquée à l’archéologie (IRAMAT-CRP2A), Institut de Recherches sur les Archéomatériaux (IRAMAT), Université de Technologie de Belfort-Montbeliard (UTBM)-Université d'Orléans (UO)-Université Bordeaux Montaigne-Centre National de la Recherche Scientifique (CNRS)-Université de Technologie de Belfort-Montbeliard (UTBM)-Université d'Orléans (UO)-Université Bordeaux Montaigne-Centre National de la Recherche Scientifique (CNRS), Centre de Recherche en Archéologie, Archéosciences, Histoire (CReAAH), Université de Nantes - UFR Histoire, Histoire de l'Art et Archéologie (UFR HHAA), Université de Nantes (UN)-Université de Nantes (UN)-Centre National de la Recherche Scientifique (CNRS)-Ministère de la Culture (MC)-Université de Rennes 2 (UR2), Université de Rennes (UNIV-RENNES)-Université de Rennes (UNIV-RENNES)-Université de Rennes 1 (UR1), Université de Rennes (UNIV-RENNES)-Le Mans Université (UM), Ministère de la Culture (MC), Service régional de l'archéologie de Normandie (SRA Normandie), ANR-10-LABX-52, LaScArBx, ANR-10-LABX-0052,LaScArBx,Using the world in ancient societies : processes and forms of appropriation of space in Long Time(2010), Université de Technologie de Belfort-Montbeliard (UTBM)-Université d'Orléans (UO)-Université Bordeaux Montaigne (UBM)-Centre National de la Recherche Scientifique (CNRS)-Université de Technologie de Belfort-Montbeliard (UTBM)-Université d'Orléans (UO)-Université Bordeaux Montaigne (UBM)-Centre National de la Recherche Scientifique (CNRS), Le Mans Université (UM)-Université de Rennes (UR)-Université de Rennes 2 (UR2)-Centre National de la Recherche Scientifique (CNRS)-Université de Nantes - UFR Histoire, Histoire de l'Art et Archéologie (UFR HHAA), Université de Nantes (UN)-Université de Nantes (UN)-Ministère de la Culture (MC), Université de Nantes (UN)-Le Mans Université (UM)-Université de Rennes 2 (UR2), Université de Rennes (UNIV-RENNES)-Centre National de la Recherche Scientifique (CNRS)-Ministère de la Culture (MC), Université d'Orléans (UO)-Centre National de la Recherche Scientifique (CNRS)-Université Bordeaux Montaigne-Université de Technologie de Belfort-Montbeliard (UTBM)-Université d'Orléans (UO)-Centre National de la Recherche Scientifique (CNRS)-Université Bordeaux Montaigne-Université de Technologie de Belfort-Montbeliard (UTBM), Nantes Université (NU)-Ministère de la Culture (MC)-Centre National de la Recherche Scientifique (CNRS)-Université de Rennes 1 (UR1), and Université de Rennes (UNIV-RENNES)-Université de Rennes (UNIV-RENNES)-Université de Rennes 2 (UR2)

Subjects
010506 paleontology, [SHS.ARCHEO]Humanities and Social Sciences/Archaeology and Prehistory, OSL dating, Stratigraphy, Geochemistry, Sediment, Geology, Sedimentation, Feldspar, 01 natural sciences, 030218 nuclear medicine & medical imaging, 03 medical and health sciences, 0302 clinical medicine, Transportation distance, Le Rozel, Footprints, visual_art, Earth and Planetary Sciences (miscellaneous), visual_art.visual_art_medium, Quartz, Optical dating, Neandertal, 0105 earth and related environmental sciences
Abstract

International audience; Luminescence ages were obtained from six sediment samples at the archaeological site ‘Le Rozel’. These samples are associated with hundreds of footprints left by humans (probably Neanderthals) in the archaeological layers. The single-grain technique was applied to 200–250 μm quartz grains, whereas K-feldspar grains were measured using the multi-grain pIRIR225 signal. For quartz, final De estimates were derived in applying a Bayesian model. The comparison of these minerals indicates that the K-feldspar ages are significantly higher than the quartz ages. Nevertheless, the OSL quartz measurements are in agreement with the sedimentological data, and consistent with previous OSL ages obtained in the 2000s for layers in a stratigraphical lower position. It was then concluded that feldspar grains have been likely insufficiently bleached due to the short transportation distance and/or because of a rapid burial by more recent sediments. Such a rapid sedimentation rate would also explain the good preservation of the found numerous human prints. Our new findings indicate that the site was inhabited during the outgoing MIS 5 and the footprints revealed an age of at least 70 ± 10 ka.

Published
2019

50. Based on the virtual experiment study of the impact of load sequence on the calculation process of random vibration fatigue damage

Author

Roger Serra, et Pierre Argoul, Yuzhu Wang, Dynamique interactions vibrations Structures (DivS), Laboratoire de Mécanique Gabriel Lamé (LaMé), Université d'Orléans (UO)-Institut National des Sciences Appliquées - Centre Val de Loire (INSA CVL), Institut National des Sciences Appliquées (INSA)-Institut National des Sciences Appliquées (INSA)-Université de Tours (UT)-Université d'Orléans (UO)-Institut National des Sciences Appliquées - Centre Val de Loire (INSA CVL), Institut National des Sciences Appliquées (INSA)-Institut National des Sciences Appliquées (INSA)-Université de Tours (UT), Université d'Orléans (UO)-Université de Tours-Institut National des Sciences Appliquées - Centre Val de Loire (INSA CVL), Institut National des Sciences Appliquées (INSA)-Institut National des Sciences Appliquées (INSA)-Université d'Orléans (UO)-Université de Tours-Institut National des Sciences Appliquées - Centre Val de Loire (INSA CVL), and Institut National des Sciences Appliquées (INSA)-Institut National des Sciences Appliquées (INSA)

Subjects
0209 industrial biotechnology, Sequence, business.industry, Significant difference, Process (computing), Fatigue damage, 02 engineering and technology, Structural engineering, [SPI]Engineering Sciences [physics], Nonlinear system, 020303 mechanical engineering & transports, 020901 industrial engineering & automation, 0203 mechanical engineering, Kurtosis, Virtual experiment, Random vibration, business, ComputingMilieux_MISCELLANEOUS, Earth-Surface Processes, Mathematics
Abstract

At present, the linear fatigue accumulation theory proposed by Miner is used to calculate the fatigue problem of random vibration. In this process, the loading order of the loads is ignored, so that the results obtained are riskier. The nonlinear fatigue cumulative damage theory takes into account the effects of the load loading sequence, but the calculation becomes more complicated. Many scholars have shown that the fatigue calculation of alternating loads is not strictly linear, and the high and low order will affect the damage index. This phenomenon will be more obvious in the random vibration process. In this paper, the effects of loading sequence on the calculation of non-Gaussian random vibration fatigue damage are studied by virtual experiments. Through the phase selection method, 7 sets of excitations with different kurtosis were loaded onto the notched specimen. Through the calculation results of fatigue damage in the notch sensitive area, it was confirmed that the damage calculated by linear and nonlinear cumulative damage formula was improved with the increase of kurtosis. The results can make a significant difference.

Published
2019

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