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128 results on '"Faure, Sylvain"'

2. Extreme congestion of microswimmers at a bottleneck constriction

Author

Brun-Cosme-Bruny, Marvin, Borne, Vincent, Faure, Sylvain, Maury, Bertrand, Peyla, Philippe, and Rafai, Salima

Subjects
Condensed Matter - Soft Condensed Matter, Physics - Biological Physics, Physics - Fluid Dynamics
Abstract

When attracted by a stimulus (e. g. light), microswimmers can build up very densely at a constriction and thus cause clogging. The micro-alga \textit{Chlamydomonas Reinhardtii} is used here as a model system to study this phenomenon. Its negative phototaxis makes the algae swim away from a light source and go through a microfabricated bottleneck-shaped constriction. Successive clogging events interspersed with bursts of algae are observed. A power law decrease is found to describe well the distribution of time lapses of blockages. Moreover, the evacuation time is found to increase when increasing the swimming velocity. These results might be related to the phenomenology of crowd dynamics and in particular what has been called the Faster is Slower effect in the dedicated literature. It also raises the question of the presence of tangential solid friction between motile cells densely packed that may accompany arches formation. Using the framework of crowd dynamics we analyze the microswimmers behavior and in particular question the role of hydrodynamics.

Published
2019

3. Numerical treatment of the nonconservative product in a multiscale fluid model for plasmas in thermal nonequilibrium: application to solar physics

Author

Wargnier, Quentin, Faure, Sylvain, Graille, Benjamin, Magin, Thierry, and Massot, Marc

Subjects
Mathematics - Numerical Analysis, Astrophysics - Solar and Stellar Astrophysics, Mathematics - Analysis of PDEs, Physics - Classical Physics, Physics - Plasma Physics
Abstract

This contribution deals with the modeling of collisional multicomponent magnetized plasmas in thermal and chemical nonequilibrium aiming at simulating and predicting magnetic reconnections in the chromosphere of the sun. We focus on the numerical simulation of a simplified fluid model in order to properly investigate the influence on shock solutions of a nonconservative product present in the electron energy equation. Then, we derive jump conditions based on travelling wave solutions and propose an original numerical treatment in order to avoid non-physical shocks for the solution, that remains valid in the case of coarse-resolution simulations. A key element for the numerical scheme proposed is the presence of diffusion in the electron variables, consistent with the physically-sound scaling used in the model developed by Graille et al. following a multiscale Chapman-Enskog expansion method [M3AS, 19 (2009) 527--599]. The numerical strategy is eventually assessed in the framework of a solar physics test case. The computational method is able to capture the travelling wave solutions in both the highly- and coarsely-resolved cases.

Published
2018
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9. 18F-FDG PET and DCE kinetic modeling and their correlations in primary NSCLC: first voxel-wise correlative analysis of human simultaneous [18F]FDG PET-MRI data

Author

Besson, Florent L., Fernandez, Brice, Faure, Sylvain, Mercier, Olaf, Seferian, Andrei, Mignard, Xavier, Mussot, Sacha, le Pechoux, Cecile, Caramella, Caroline, Botticella, Angela, Levy, Antonin, Parent, Florence, Bulifon, Sophie, Montani, David, Mitilian, Delphine, Fadel, Elie, Planchard, David, Besse, Benjamin, Ghigna-Bellinzoni, Maria-Rosa, Comtat, Claude, Lebon, Vincent, and Durand, Emmanuel

Published
2020
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10. Non classical solution of a conservation law arising in vehicular traffic modelling

Author

Fabre Mathieu, Faure Sylvain, Laurière Mathieu, Maury Bertrand, and Perrin Charlotte

Subjects
Applied mathematics. Quantitative methods, T57-57.97, Mathematics, QA1-939
Abstract

We are interested in this paper in the modelling and numerical simulation of some phenomena that are observed in the context of car dynamics, in particular the appearance of persistent jams upstream critical points with no real cause of flux limitation. We shall consider the case of a stable jam on a freeway upstream an accident that took place on the opposite lane. This situation is not properly handled by most models, either micro-or macroscopic ones, since it corresponds to a phenomenon that does not have a counterpart in gas dynamics, for which only entropy solution are usually considered as physically feasible. The approach we propose consists in accounting for the very behaviour of agents in the neighbourhood of the discontinuity, and makes it possible to numerically recover in a robust way steady traffic jams.

Published
2016
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15. Dense flow around a sphere moving into a cloud of grains

Author

Gondret Philippe, Faure Sylvain, Lefebvre-Lepot Aline, and Seguin Antoine

Subjects
Physics, QC1-999
Abstract

A bidimensional simulation of a sphere moving at constant velocity into a cloud of smaller spherical grains without gravity is presented with a non-smooth contact dynamics method. A dense granular “cluster” zone of about constant solid fraction builds progressively around the moving sphere until a stationary regime appears with a constant upstream cluster size that increases with the initial solid fraction ϕ0 of the cloud. A detailed analysis of the local strain rate and local stress fields inside the cluster reveals that, despite different spatial variations of strain and stresses, the local friction coeffcient μ appears to depend only on the local inertial number I as well as the local solid fraction ϕ, which means that a local rheology does exist in the present non parallel flow. The key point is that the spatial variations of I inside the cluster does not depend on the sphere velocity and explore only a small range between about 10−2 and 10−1. The influence of sidewalls is then investigated on the flow and the forces.

Published
2017
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16. DEMETERRES project: development of innovative technologies for removing radionuclides from contaminated solid and liquid matrices

Author

Chagvardieff Pierre, Barré Yves, Blin Virginie, Faure Sylvain, Fornier Anne, Grange Didier, Grandjean Agnès, Guiderdoni Emmanuel, Henner Pascale, Siroux Brice, Leybros Antoine, Messalier Marc, Paillard Hervé, Prévost Thierry, Rennesson Malvina, Sarrobert Catherine, Vavasseur Alain, and Véry Anne-Aliénor

Subjects
Physics, QC1-999
Abstract

As part of the « post-accidental » management, the DEMETERRES project (RSNR PIA) proposes to develop innovative and environmentally friendly methods for removal of cesium and strontium from soils and liquid matrices in order to rehabilitate them for an agricultural use while minimizing the volume of generated wastes in accordance with the nuclear waste existing processes. Complementary approaches are used: they are based on physico-chemical technologies (such as foams flotation, supercritical CO2 extraction, extractants in fluidized bed reactor …) and biological ones (bioextractants, phytoextraction) which concepts are described. These researches aim to design innovative and performing extractants in term of selectivity and to achieve the pilot reactor phase for each of them. These pilots will group in a network to provide a technological platform lasting the project, to which will be attached an available network of experts. The respective advances of these researches are presented, completed of tests initiated in Japan on contaminated soils through partnerships.

Published
2017
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18. Fully Integrated Quantitative Multiparametric Analysis of Non–Small Cell Lung Cancer at 3-T PET/MRI

Author

Besson, Florent L., primary, Fernandez, Brice, additional, Faure, Sylvain, additional, Mercier, Olaf, additional, Seferian, Andrei, additional, Mussot, Sacha, additional, Levy, Antonin, additional, Parent, Florence, additional, Bulifon, Sophie, additional, Jais, Xavier, additional, Montani, David, additional, Mitilian, Delphine, additional, Fadel, Elie, additional, Planchard, David, additional, Ghigna-Bellinzoni, Maria-Rosa, additional, Comtat, Claude, additional, Lebon, Vincent, additional, and Durand, Emmanuel, additional

Published
2021
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21. 18F-FDG PET and DCE kinetic modeling and their correlations in primary NSCLC: First voxel-wise correlative analysis of human simultaneous [18F]FDG PET-MRI data

Author

Besson, Florent L, primary, Fernandez, Brice, additional, Faure, Sylvain, additional, Mercier, Olaf, additional, Seferian, Andrei, additional, Mignard, Xavier, additional, Mussot, Sacha, additional, Péchoux, Cécile le, additional, Caramella, Caroline, additional, Botticella, Angela, additional, Levy, Antonin, additional, Parent, Florence, additional, Bulifon, Sophie, additional, Montani, David, additional, Mitilian, Delphine, additional, Fadel, Elie, additional, Planchard, David, additional, Besse, Benjamin, additional, Ghigna-Bellinzoni, Maria-Rosa, additional, Comtat, Claude, additional, Lebon, Vincent, additional, and Durand, Emmanuel, additional

Published
2020
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22. 18F-FDG PET and DCE kinetic modeling and their interlinks in primary NSCLC: First-in human simultaneous [18F]FDG PET-MRI voxel-wise correlation analysis

Author

Besson, Florent L, primary, Fernandez, Brice, additional, Faure, Sylvain, additional, Mercier, Olaf, additional, Seferian, Andrei, additional, Mignard, Xavier, additional, Mussot, Sacha, additional, Péchoux, Cécile le, additional, Caramella, Caroline, additional, Botticella, Angela, additional, Levy, Antonin, additional, Parent, Florence, additional, Bulifon, Sophie, additional, Montani, David, additional, Mitilian, Delphine, additional, Fadel, Elie, additional, Planchard, David, additional, Besse, Benjamin, additional, Ghigna-Bellinzoni, Maria-Rosa, additional, Comtat, Claude, additional, Lebon, Vincent, additional, and Durand, Emmanuel, additional

Published
2020
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23. Diffusion-weighted Imaging Voxelwise-matched Analyses of Lung Cancer at 3.0-T PET/MRI: Reverse Phase Encoding Approach for Echo-planar Imaging Distortion Correction

Author

Besson, Florent L., primary, Fernandez, Brice, additional, Faure, Sylvain, additional, Mercier, Olaf, additional, Seferian, Andrei, additional, Blanchet, Élise, additional, Mignard, Xavier, additional, Chetouani, Ahmed, additional, Bulifon, Sophie, additional, Mussot, Sacha, additional, Parent, Florence, additional, Bouderraoui, Fahd, additional, Montani, David, additional, Mitilian, Delphine, additional, Fadel, Elie, additional, Ghigna-Bellinzoni, Maria-Rosa, additional, Cherkaoui, Hamza, additional, Comtat, Claude, additional, Lebon, Vincent, additional, and Durand, Emmanuel, additional

Published
2020
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24. Deciphering the metabolism/vascularization regional interlinks in primary NSCLC First-in human simultaneous full kinetic 18F-FDG PET-MRI voxel-wise analysis

Author

Besson, Florent L, primary, Fernandez, Brice, additional, Faure, Sylvain, additional, Mercier, Olaf, additional, Seferian, Andrei, additional, Mignard, Xavier, additional, Mussot, Sacha, additional, Péchoux, Cécile le, additional, Caramella, Caroline, additional, Botticella, Angela, additional, Levy, Antonin, additional, Parent, Florence, additional, Bulifon, Sophie, additional, Montani, David, additional, Mitilian, Delphine, additional, Fadel, Elie, additional, Planchard, David, additional, Besse, Benjamin, additional, Ghigna-Bellinzoni, Maria-Rosa, additional, Comtat, Claude, additional, Lebon, Vincent, additional, and Durand, Emmanuel, additional

Published
2020
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28. Modèle à compartiments continu en temps de l'évacuation d'un bâtiment

Author

Maury, Bertrand, Faure, Sylvain, Angelé, Jacques, Bachimont, Rémi, Maury, Bertrand, Département de Mathématiques et Applications - ENS Paris (DMA), Centre National de la Recherche Scientifique (CNRS)-École normale supérieure - Paris (ENS Paris), Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL), Laboratoire de Mathématiques d'Orsay (LM-Orsay), Centre National de la Recherche Scientifique (CNRS)-Université Paris-Sud - Paris 11 (UP11), Signactif, École normale supérieure - Paris (ENS Paris), and Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL)-Centre National de la Recherche Scientifique (CNRS)

Subjects
ACM: G.: Mathematics of Computing/G.1: NUMERICAL ANALYSIS/G.1.7: Ordinary Differential Equations/G.1.7.6: Initial value problems, ACM: I.: Computing Methodologies/I.6: SIMULATION AND MODELING/I.6.5: Model Development/I.6.5.0: Modeling methodologies, ACM: I.: Computing Methodologies/I.6: SIMULATION AND MODELING/I.6.5: Model Development, risk assessment, evacuation times, modeling, human behavior, [INFO.INFO-MO] Computer Science [cs]/Modeling and Simulation, exit capacities, [INFO.INFO-MO]Computer Science [cs]/Modeling and Simulation
Abstract

International audience; We propose here a general framework to estimate global evacuation times of complex buildings, and to dynamically investigate the dependence of this evacuation time upon various factors. This model relies on a network, which is in some way the skeleton of the building, the nodes of which are the bottlenecks or exit doors. Those nodes are connected by edges which correspond to portions of egress paths located within a given room. Such models have been proposed in a discrete setting. The model we propose takes the form of a continuous evolution equation of the differential type. It relies on a limited number of variables, namely the number of people gathered upstream each node, together with the number of people on their way from a node to the next one. The basic parameters of the model are the capacities of doors, and the time needed to walk from one node to the next one. In spite of its macroscopic character (the motions of pedestrians are not described individually), this approach allows to account for complex and nonlinear effects such as capacity drop at bottlenecks, congestion induced speed reduction, and possibly some dispersion in evacuees behaviors. We present here the basic version of the model, together with the numerical methodology which is used to solve the equations, and we illustrate the behavior of the algorithm by a comparison with experimental data.

Published
2018

33. DEMETERRES project: Development of innovative technologies for removing radionuclides from contaminated solid and liquid matrices

Author

Chagvardieff, Pierre, Barré, Yves, Blin, Virginie, Faure, Sylvain, Fornier, Anne, Grange, Didier, Grandjean, Agnès, Guiderdoni, Emmanuel, Henner, Pascale, Siroux, Brice, Leybros, Antoine, Messalie, Marc, Paillard, Hervé, Prévost, Thierry, Rennesson, Malvina, Sarrobert, Catherine, Vavasseur, Alain, Very, Anne-Aliénor, Chagvardieff, Pierre, Barré, Yves, Blin, Virginie, Faure, Sylvain, Fornier, Anne, Grange, Didier, Grandjean, Agnès, Guiderdoni, Emmanuel, Henner, Pascale, Siroux, Brice, Leybros, Antoine, Messalie, Marc, Paillard, Hervé, Prévost, Thierry, Rennesson, Malvina, Sarrobert, Catherine, Vavasseur, Alain, and Very, Anne-Aliénor

Abstract

As part of the " post-accidental " management, the DEMETERRES project (RSNR PIA) proposes to develop innovative and environmentally friendly methods for removal of cesium and strontium from soils and liquid matrices in order to rehabilitate them for an agricultural use while minimizing the volume of generated wastes in accordance with the nuclear waste existing processes. Complementary approaches are used: they are based on physico-chemical technologies (such as foams flotation, supercritical CO2 extraction, extractants in fluidized bed reactor ...) and biological ones (bioextractants, phytoextraction) which concepts are described. These researches aim to design innovative and performing extractants in term of selectivity and to achieve the pilot reactor phase for each of them. These pilots will group in a network to provide a technological platform lasting the project, to which will be attached an available network of experts. The respective advances of these researches are presented, completed of tests initiated in Japan on contaminated soils through partnerships.

Published
2017

34. NON CLASSICAL SOLUTION OF A CONSERVATION LAW ARISING IN VEHICULAR TRAFFIC MODELLING *

Author

Fabre, Mathieu, Faure, Sylvain, Laurière, Mathieu, Maury, Bertrand, Perrin, Charlotte, Maury, Bertrand, Systemes d'Interactions, Transport Optimal, Applications a la simulation en Economie. - - ISOTACE2012 - ANR-12-MONU-0013 - MN - VALID, Ecole Polytechnique Fédérale de Lausanne (EPFL), Laboratoire de Mathématiques d'Orsay (LM-Orsay), Centre National de la Recherche Scientifique (CNRS)-Université Paris-Sud - Paris 11 (UP11), Laboratoire Jacques-Louis Lions (LJLL), Université Pierre et Marie Curie - Paris 6 (UPMC)-Université Paris Diderot - Paris 7 (UPD7)-Centre National de la Recherche Scientifique (CNRS), Département de Mathématiques et Applications - ENS Paris (DMA), Centre National de la Recherche Scientifique (CNRS)-École normale supérieure - Paris (ENS Paris), Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL), Rheinisch-Westfälische Technische Hochschule Aachen (RWTH), and ANR-12-MONU-0013,ISOTACE,Systemes d'Interactions, Transport Optimal, Applications a la simulation en Economie.(2012)

Subjects
Nonclassical Shocks, [MATH.MATH-AP]Mathematics [math]/Analysis of PDEs [math.AP], [PHYS.MECA.MEFL] Physics [physics]/Mechanics [physics]/Fluid mechanics [physics.class-ph], [PHYS.MECA.MEFL]Physics [physics]/Mechanics [physics]/Fluid mechanics [physics.class-ph], Entropic Solutions, [MATH.MATH-NA] Mathematics [math]/Numerical Analysis [math.NA], [MATH.MATH-AP] Mathematics [math]/Analysis of PDEs [math.AP], Traffic Flow Modeling, [MATH.MATH-NA]Mathematics [math]/Numerical Analysis [math.NA]
Abstract

We are interested in this paper in the modelling and numerical simulation of some phenomena that are observed in the context of car dynamics, in particular the appearance of persistent jams upstream critical points with no real cause of flux limitation. We shall consider the case of a stable jam on a freeway upstream an accident that took place on the opposite lane. This situation is not properly handled by most models, either micro-or macroscopic ones, since it corresponds to a phenomenon that does not have a counterpart in gas dynamics, for which only entropy solution are usually considered as physically feasible. The approach we propose consists in accounting for the very behaviour of agents in the neighbourhood of the discontinuity, and makes it possible to numerically recover in a robust way steady traffic jams., Nous nous intéressons dans cet article à la modélisation et à la simulation numérique de phénomènes particuliers observés dans le contexte du trafic routier, plus particulièrement le phénomène d’apparition et de persistance de bouchons en amont de points critiques sans cause objective de ralentissement. Nous considérerons notamment le cas d’un bouchon persistant sur une autoroute en amont d’un accident qui s’est produit sur la voie d’en face. Cette situation n’est pas reproduite par la plupart des modèles, qu’ils soient microscopiques ou macroscopiques, car elle correspond à un phénomène qui n’a pas d’équivalent en dynamique des gaz, pour lesquels seules les solutions dites entropiques sont en général considérées comme correspondant à un comportement observable dans la réalité. L’approche que nous proposons, aux niveaux microscopique et macroscopique, consiste à prendre en compte le comportement particulier des agents humains au voisinage de la discontinuité, et permet de retrouver numériquement de façon robuste des bouchons stables.

Published
2016

35. Faisabilité d'un microcapteur électromécanique par optimisation d'adhérence des interfaces verre/métal et fluide biologique

Author

Didier, Pierre, Coulon, Jean-François, Faure, Sylvain, Razan, Florence, Bio-MIcroSystèmes et BioSensors (SATIE-BIOMIS), Systèmes d'Information et d'Analyse Multi-Echelles (SIAME), Systèmes et Applications des Technologies de l'Information et de l'Energie (SATIE), École normale supérieure - Cachan (ENS Cachan)-Université Paris-Sud - Paris 11 (UP11)-Institut Français des Sciences et Technologies des Transports, de l'Aménagement et des Réseaux (IFSTTAR)-École normale supérieure - Rennes (ENS Rennes)-Université de Cergy Pontoise (UCP), Université Paris-Seine-Université Paris-Seine-Conservatoire National des Arts et Métiers [CNAM] (CNAM)-Centre National de la Recherche Scientifique (CNRS)-École normale supérieure - Cachan (ENS Cachan)-Université Paris-Sud - Paris 11 (UP11)-Institut Français des Sciences et Technologies des Transports, de l'Aménagement et des Réseaux (IFSTTAR)-École normale supérieure - Rennes (ENS Rennes)-Université de Cergy Pontoise (UCP), Université Paris-Seine-Université Paris-Seine-Conservatoire National des Arts et Métiers [CNAM] (CNAM)-Centre National de la Recherche Scientifique (CNRS)-Systèmes et Applications des Technologies de l'Information et de l'Energie (SATIE), Université Paris-Seine-Université Paris-Seine-Conservatoire National des Arts et Métiers [CNAM] (CNAM)-Centre National de la Recherche Scientifique (CNRS), and Razan, Florence

Subjects
[SPI.NANO] Engineering Sciences [physics]/Micro and nanotechnologies/Microelectronics, [SPI.NANO]Engineering Sciences [physics]/Micro and nanotechnologies/Microelectronics, ComputingMilieux_MISCELLANEOUS
Abstract

National audience

Published
2013

37. New Biocide Foam Containing Hydrogen Peroxide for the Decontamination of Vertical Surface Contaminated With Bacillus thuringiensis Spores.

Author

Toquin, Esther Le, Faure, Sylvain, Orange, Nicole, and Gas, Fabienne

Subjects
BIOCIDES, FOAM, HYDROGEN peroxide, BACILLUS thuringiensis, SPORES
Abstract

Despite scientific advances, bacterial spores remain a major preoccupation in many different fields, such as the hospital, food, and CBRN-E Defense sector. Although many disinfectant technologies exist, there is a lack for the decontamination of difficult to access areas, outdoor sites, or large interior volumes. This study evaluates the decontamination efficiency of an aqueous foam containing hydrogen peroxide, with the efficiency of disinfectant in the liquid form on vertical surfaces contaminated by Bacillus thurengiensis spores. The decontamination efficiency impact of the surfactant and stabilizer agents in the foam and liquid forms was evaluated. No interferences were observed with these two chemical additives. Our results indicate that the decontamination kinetics of both foam and liquid forms are similar. In addition, while the foam form was as efficient as the liquid solution at 4°C, it was even more so at 30°C. The foam decontamination reaction follows the Arrhenius law, which enables the decontamination kinetic to be predicted with the temperature. Moreover, the foam process used via spraying or filling is more attractive due to the generation of lower quantity of liquid effluents. Our findings highlight the greater suitability of foam to decontaminate difficult to access and high volume facilities compared to liquid solutions. [ABSTRACT FROM AUTHOR]

Published
2018
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40. Micellar solubilization of tributylphosphate in aqueous solutions of Pluronic block copolymers - Part II. Structural characterization inferred by H-1 NMR

Author

Causse, Jérémy, Lagerge, Serge, De Menorval, Louis-Charles, Faure, Sylvain, Institut Charles Gerhardt Montpellier - Institut de Chimie Moléculaire et des Matériaux de Montpellier (ICGM ICMMM), Ecole Nationale Supérieure de Chimie de Montpellier (ENSCM)-Centre National de la Recherche Scientifique (CNRS)-Université de Montpellier (UM)-Université Montpellier 1 (UM1)-Université Montpellier 2 - Sciences et Techniques (UM2)-Institut de Chimie du CNRS (INC), Laboratoire des Procedes Avances de Decontamination (LPAD), Commissariat à l'énergie atomique et aux énergies alternatives (CEA), and Université Montpellier 1 (UM1)-Université Montpellier 2 - Sciences et Techniques (UM2)-Ecole Nationale Supérieure de Chimie de Montpellier (ENSCM)-Institut de Chimie du CNRS (INC)-Centre National de la Recherche Scientifique (CNRS)

Subjects
[CHIM.THEO]Chemical Sciences/Theoretical and/or physical chemistry, ComputingMilieux_MISCELLANEOUS
Abstract

International audience

Published
2006

41. Micellar solubilization of tributylphosphate in aqueous solutions of Pluronic block copolymers - Part I. Effect of the copolymer structure and temperature on the phase behavior

Author

Causse, Jérémy, Lagerge, Serge, De Menorval, Louis-Charles, Faure, Sylvain, Institut Charles Gerhardt Montpellier - Institut de Chimie Moléculaire et des Matériaux de Montpellier (ICGM ICMMM), Université Montpellier 1 (UM1)-Université Montpellier 2 - Sciences et Techniques (UM2)-Ecole Nationale Supérieure de Chimie de Montpellier (ENSCM)-Institut de Chimie du CNRS (INC)-Centre National de la Recherche Scientifique (CNRS), Laboratoire des Procédés Avancés de Décontamination (LPAD), Commissariat à l'énergie atomique et aux énergies alternatives (CEA), and Ecole Nationale Supérieure de Chimie de Montpellier (ENSCM)-Centre National de la Recherche Scientifique (CNRS)-Université de Montpellier (UM)-Université Montpellier 1 (UM1)-Université Montpellier 2 - Sciences et Techniques (UM2)-Institut de Chimie du CNRS (INC)

Subjects
[CHIM.THEO]Chemical Sciences/Theoretical and/or physical chemistry, ComputingMilieux_MISCELLANEOUS
Abstract

International audience

Published
2006

42. Multilevel computation of the demagnetization field in periodic domains applied to micromagnetism computations

Author

Labbé, Stéphane, Faure, Sylvain, Labbé, Stéphane, Laboratoire de Mathématiques d'Orsay (LM-Orsay), and Université Paris-Sud - Paris 11 (UP11)-Centre National de la Recherche Scientifique (CNRS)

Subjects
multilevel method, Condensed Matter::Materials Science, 45E99, 68W01, Toeplitz matrix, [MATH.MATH-NA] Mathematics [math]/Numerical Analysis [math.NA], [MATH.MATH-NA]Mathematics [math]/Numerical Analysis [math.NA]
Abstract

In many applications, for instance the simulation of the behaviour of ferromagnetic materials, the demagnetization field, approximation of the Maxwell contribution, has to be computed. One of the applications aimed by this paper is the simulation of ferromagnetic periodic layers. This type of layers could be, for example, structured poly-cristals or textured thin layers of dispersed ferromagnetic dots. In these two cases, in order to compute the evolution of a periodic magnetization, it becomes necessary to carefully take into account the demagnetization contribution. Indeed, the extension of non-periodic computations to periodic computations is not straightforward in the case of demagnetization field.

Published
2006

43. La caracterisation des installations et des sols

Author

Mahé, Charly, primary, Mosbah, Mehdi Ben, additional, Venara, Julien, additional, Coulon, Nadine, additional, L’Hermite, Daniel, additional, Fichet, Pascal, additional, Faure, Sylvain, additional, and Dugne, Olivier, additional

Published
2014
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46. Finite volume approximation of stiff problems on two-dimensional curvilinear domain.

Author

Faure, Sylvain, Tekitek, Mohamed Mahdi, and Temam, Roger

Subjects
*FINITE volume method, *APPROXIMATION theory, *LINE integrals, *TWO-dimensional models, *DIFFERENTIAL equations
Abstract

The aim of this article is to apply a novel finite volume method to approximate a stiff problem for a two-dimensional curvilinear domain. The stiffness is caused by the existence of a small parameter in the equation which introduces a boundary layer along parts of the curvilinear boundary. Incorporating in the finite volume space the boundary layer correctors, the boundary layer singularities are absorbed. Hence, we propose a second order scheme for curvilinear domains using uniform meshes thus avoiding the costly refinement of mesh in the boundary layers. [ABSTRACT FROM PUBLISHER]

Published
2016
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47. Sulfonated polyimides, membranes and fuel cells

Author

Faure, Sylvain, Pineri, Michel, Aldebert, Pierre, Mercier, Régis, Sillion, Bernard, Martin Sempore, Brigitte, Département de Recherche Fondamentale sur la Matière Condensée (DRFMC), Commissariat à l'énergie atomique et aux énergies alternatives (CEA), Matériaux organiques à propriétés spécifiques (LMOPS), Laboratoire d'Electrochimie et de Physico-chimie des Matériaux et des Interfaces (LEPMI ), Institut de Chimie du CNRS (INC)-Institut National Polytechnique de Grenoble (INPG)-Institut polytechnique de Grenoble - Grenoble Institute of Technology (Grenoble INP )-Université Joseph Fourier - Grenoble 1 (UJF)-Université Savoie Mont Blanc (USMB [Université de Savoie] [Université de Chambéry])-Centre National de la Recherche Scientifique (CNRS)-Institut de Chimie du CNRS (INC)-Institut National Polytechnique de Grenoble (INPG)-Institut polytechnique de Grenoble - Grenoble Institute of Technology (Grenoble INP )-Université Joseph Fourier - Grenoble 1 (UJF)-Université Savoie Mont Blanc (USMB [Université de Savoie] [Université de Chambéry])-Centre National de la Recherche Scientifique (CNRS), and Université Joseph Fourier - Grenoble 1 (UJF)-Institut polytechnique de Grenoble - Grenoble Institute of Technology (Grenoble INP )-Institut National Polytechnique de Grenoble (INPG)-Institut de Chimie du CNRS (INC)-Université Savoie Mont Blanc (USMB [Université de Savoie] [Université de Chambéry])-Centre National de la Recherche Scientifique (CNRS)-Université Joseph Fourier - Grenoble 1 (UJF)-Institut polytechnique de Grenoble - Grenoble Institute of Technology (Grenoble INP )-Institut National Polytechnique de Grenoble (INPG)-Institut de Chimie du CNRS (INC)-Université Savoie Mont Blanc (USMB [Université de Savoie] [Université de Chambéry])-Centre National de la Recherche Scientifique (CNRS)

Subjects
[CHIM.POLY] Chemical Sciences/Polymers, [CHIM.POLY]Chemical Sciences/Polymers
Abstract

The title sulfonated polyimides comprise repeating units I and II (Z1-2 = tetravalent group; Ar1-2 = arom. divalent group). The polymers are useful as ion-exchange membranes, esp. for fuel cells. The membranes have good durability and the fuel cells can be used in elec. vehicles. A polymer was prepd. by polymn.. of 4,4'-diamino-(1,1'-biphenyl)-2,2'-disulfonic acid, 4,4'-methylenebisbenzeneamine, and 5,5'-oxybis(1,3-isobenzofurandione)

Published
1997

48. Clay Flotation: Effect of TTAB Cationic Surfactant on Foaming and Stability of Illite Clay Microaggregates Foams.

Author

Chapelain, Julie C. M., Faure, Sylvain, and Beneventi, Davide

Subjects
*CATIONIC surfactants, *CHEMICAL stability, *METAL foams, *BROMIDES, *SURFACE chemistry
Abstract

Particulate foams are of great interest in mineral processing, water treatment, and soil remediation. One of the first conditions allowing the capture of a particle by an air bubble is surface hydrophobicity. An alkylammonium bromide surfactant (TTAB) was used to perform in situ hydrophobication of negatively charged illite clay particles. This treatment causes the neutralization of clay surface charge and the irreversible aggregation of particles. At a fixed amount of TTAB in solution, foams generated from illite clay suspensions present a better foaming ability and stability than bare TTAB solutions. The relative quantity of TTAB necessary to reach the “ideal foaming ability” corresponding to the capture of all injected gas by the foam decreased when clay concentration increased. Capture and collision probability increase may explain this phenomenon. Moreover, selectivity for the smallest clay particle size fraction (3 Îm) in foams was observed and is correlated with foam height and drainage time. [ABSTRACT FROM AUTHOR]

Published
2015
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