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Academic literature on the topic 'Dynamique multi-échelle'
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Journal articles on the topic "Dynamique multi-échelle"
Jendli, Z., J. Fitoussi, F. Meraghni, and D. Baptiste. "Comportement et endommagement dynamique multi-échelle de composites SMC-R26." Matériaux & Techniques 93, no. 3-4 (2005): 93–102. http://dx.doi.org/10.1051/mattech/200593093.
Full textSalles, Loïc, Laurent Blanc, Fabrice Thouverez, Alexander Mikhailovitch Gouskov, and Pierrick Jean. "Analyse multi-échelle de l’usure par fretting sous chargement dynamique." Mécanique & Industries 11, no. 3-4 (May 2010): 277–82. http://dx.doi.org/10.1051/meca/2010034.
Full textFregnac, Yves, Pierre Baudot, Frédéric Chavane, Olivier Marre, Cyril Monier, Marc Pananceau, and Gérard Sadoc. "Imagerie fonctionnelle multi-échelle : reconstruction de la dynamique corticale à partir des échos synaptiques enregistrés dans un seul neurone." Bulletin de l'Académie Nationale de Médecine 193, no. 4 (April 2009): 851–62. http://dx.doi.org/10.1016/s0001-4079(19)32526-9.
Full textMaillé, Eric, Bernard Espinasse, and Sébastien Fournié. "Des agents spatiaux pour l'intégration multi-échelle de modèles de dynamiques spatiales. Application à la modélisation et la simulation de la dynamique du risque d'incendie de forêt." Revue internationale de géomatique 19, no. 4 (December 30, 2009): 523–49. http://dx.doi.org/10.3166/geo.19.523-549.
Full textBayoumi, Hala. "Un portail web de cartographie interactive des recensements égyptiens sur deux siècles (1882-2017)." Varia 5 (2022): 75–90. http://dx.doi.org/10.4000/11tb3.
Full textOlmedo, Ignacio, Marie-Aurélie Chanut, Cyril Douthe, Mathieu Verdet, Clément Galandrin, Loic Dugelas, and David Bertrand. "Étude expérimentale multi-échelle sur les écrans pare-blocs : comportement des ouvrages hors cadre ETAG27." Revue Française de Géotechnique, no. 163 (2020): 8. http://dx.doi.org/10.1051/geotech/2020018.
Full textRAULT, Charlotte, Aurélien AUDEVARD, Nicolas BASTIDE, and Jean-Yves BARNAGAUD. "Dynamiques temporelles de la diversité taxonomique des Oiseaux d’eau sur un marais salant protégé." Naturae, no. 18 (December 7, 2022). http://dx.doi.org/10.5852/naturae2022a18.
Full textDissertations / Theses on the topic "Dynamique multi-échelle"
Masson, Elisa. "Approche multi-échelle de la turbulence : formulation d'un nouveau modèle multi-échelle : application à la prévision du décrochage." Aix-Marseille 2, 2006. http://theses.univ-amu.fr.lama.univ-amu.fr/2006AIX22065.pdf.
Full textFernier, Alexandre. "Couplage multi-échelle pour l'intéraction fluide structure en dynamique rapide." Thesis, Université Paris-Saclay (ComUE), 2019. http://www.theses.fr/2019SACLY001/document.
Full textIn nuclear industry, simulating accidental transient sequences at full reactor scale is becoming an increasingly important feature of the safety demonstration towards national agencies. It thus allows limiting the number of complex and costly experiments, while simplifying and accelerating the evaluation of mitigation strategies. However, the implemented numerical models are inevitably heavy to build and maintain, with a global modelling scale making it difficult to account for local geometric details yet able to significantly influence the physical solution. To provide an answer to these problems, this PhD work is dedicated to multi-model approaches designed to integrate such details into bigger models with no modification at the global level (techniques often designated as numerical zoom techniques). Some methods are proposed for both structures and fluids, with special care given to the accuracy and stability of the coupled multi-scale solution compared to a single-scale reference solution. This work handles two very specific topics, namely its compatibility with numerical features imposed by fast transient dynamics with explicit time integration, and the general objective of simultaneously dealing with superimposed models and fluid-structure interaction
Fernier, Alexandre. "Couplage multi-échelle pour l'intéraction fluide structure en dynamique rapide." Electronic Thesis or Diss., Université Paris-Saclay (ComUE), 2019. http://www.theses.fr/2019SACLY001.
Full textIn nuclear industry, simulating accidental transient sequences at full reactor scale is becoming an increasingly important feature of the safety demonstration towards national agencies. It thus allows limiting the number of complex and costly experiments, while simplifying and accelerating the evaluation of mitigation strategies. However, the implemented numerical models are inevitably heavy to build and maintain, with a global modelling scale making it difficult to account for local geometric details yet able to significantly influence the physical solution. To provide an answer to these problems, this PhD work is dedicated to multi-model approaches designed to integrate such details into bigger models with no modification at the global level (techniques often designated as numerical zoom techniques). Some methods are proposed for both structures and fluids, with special care given to the accuracy and stability of the coupled multi-scale solution compared to a single-scale reference solution. This work handles two very specific topics, namely its compatibility with numerical features imposed by fast transient dynamics with explicit time integration, and the general objective of simultaneously dealing with superimposed models and fluid-structure interaction
Paquet, Amaury. "Caractérisation multi-échelle de phases organiques concentrées." Thesis, Montpellier, 2019. http://www.theses.fr/2019MONTS019/document.
Full textIn the framework of development of new processes for spent nuclear fuel reprocessing, new extractant molecules are studied.The goals of this thesis are to study the molecular and supramolecular speciation of representative organic solutions. The speciation was determined by coupling experimental and theoretical study. After solute extraction, the composition of the organic solutions is experimentally determined. Simulations boxes with the same composition than experimental solutions are build. After simulation, trajectories are used to calculate small angle scattered intensities. The representativeness of the simulations is checked by comparison of experimental and calculated scattered intensities. The use of the simulation, ESI-MS spectrometry and IR spectroscopy provides the description of the structures in organic solution at the molecular and supramolecular scale. This methodology was applied on water and uranyl nitrate extraction by the monoamide DEHBA and MOEHA and by the malonamide DMDOHEMA as well as the extraction of water and neodymium nitrate by TODGA solutions.The extraction of water is dependent of the organization of the solution: monoamide solution made of monomer and dimer solubilize few amount of water in comparison with DMDOHEMA or TODGA solutions.The extraction of uranyl nitrate showed different behavior. UO2(NO3)2L2 complexes are observed at low uranium concentration after extraction by the monoamides. Polymetallic species are observed with the increase of uranium concentration. In the case of DMDOHEMA, monometallic complexes are majority but without a unique stoichiometry. The uranyl can be linked to 1 o 2 malonamides, 2 nitrates and sometimes to a water molecule. Neodymium is extracted by TODGA within small aggregates made of 2 or 3 cations liked by bridging nitrates. The increase of the concentration of neodymium leads to a phase separation. The presence of octanol provides the extraction of higher concentration of neodymium nitrate. Simulations showed the replacement of water and TODGA molecules and the first coordination sphere of the cation with octanol molecule. This increases the solubility of the aggregates. The presence of DMDOHEMA prevents also the phase separation by structuring the solution. With malonamide, smaller aggregates are observed.For both systems, phases after demixing (third phase formation) were characterized.This work provides the study of the molecular and supramolecular organization of organic solutions by combining experimental studies and molecular dynamic simulations
Bettinotti, Omar. "Une méthode multi-échelle de substitution faiblement intrusive en dynamique explicite." Phd thesis, École normale supérieure de Cachan - ENS Cachan, 2014. http://tel.archives-ouvertes.fr/tel-01073520.
Full textThouron, Laëtitia. "Modélisation dynamique multi-échelle de la pollution atmosphérique en milieu urbain." Thesis, Paris Est, 2017. http://www.theses.fr/2017PESC1206/document.
Full textUrban air pollution has been identified as an important cause of health impacts, including premature deaths. In particular, ambient concentrations of gaseous pollutants such as nitrogen dioxide (NO2) and particulate matter (PM10 and PM2.5) are regulated, which means that emission reduction strategies must be put in place to reduce these concentrations in places where the corresponding regulations are not respected. Besides, air pollution can contribute to the contamination of other media, for example through the contribution of atmospheric deposition to runoff contamination.The multifactorial and multiscale aspects of urban make the pollution sources difficult to identify. Indeed, the urban environment is a heterogeneous space characterized by complex architectural structures (old buildings alongside a more modern building, residential, commercial, industrial zones, roads, etc.), non-uniform atmospheric pollutant emissions and therefore the population exposure to pollution is variable in space and time.The modeling of urban air pollution aims to understand the origin of pollutants, their spatial extent and their concentration/deposition levels. Some pollutants have long residence times and can stay several weeks in the atmosphere (PM2.5) and therefore be transported over long distances, while others are more local (NOx in the vicinity of traffic). The spatial distribution of a pollutant will therefore depend on several factors, and in particular on the surfaces encountered. Air quality depends strongly on weather, buildings (canyon-street) and emissions.The aim of this thesis is to address some of these aspects by modeling: (1) urban background pollution with a transport-chemical model (Polyphemus / POLAIR3D), which makes it possible to estimate atmospheric pollutants by type of urban surfaces (roofs, walls and roadways), (2) street-level pollution by explicitly integrating the effects of the building in a three-dimensional way with a multi-scale model of transport chemistry (SinG) and (3) a microscale process which is the traffic-related resuspension of the particles present on the road surface with three different formulations (deterministic, semi-empirical and empirical).The interest of this thesis is to compare and evaluate the operability and performance of several air quality models at different scales (region, neighborhood and street) in order to better understand the characterization of air quality in an urban environment
Saliou, Anthony. "Modélisation multi-échelle des géopolymères : du liquide au solide." Electronic Thesis or Diss., Université de Montpellier (2022-....), 2024. http://www.theses.fr/2024UMONS019.
Full textGeopolymers are alternative binders to cement and form a promising class of materials for civil and nuclear engineering. Based on aluminosilicate, they can develop strong mechanical properties that are of great interest for the storage of radioactive wastes or isolating foams. The geo-polymerization process starts with the dissolution of a solid aluminosilicate source with an alkaline solution of high pH. Oligomers of few nanometers in size form and aggregate in a 3D percolating porous network at the mesoscale (hundreds of nm). Mechanical setting is reached in about 5h, analogous of setting in neat cement pastes. Several questions remain open regarding the complex process of geopolymerisation such as : What originates cohesion ? What is the water behavior at the grain-grain interface within the gel ? How to model the complex gel phase at the atomistic level ? In this thesis, molecular simulations are used to investigate the formation mechanism of geopolymers at the atomistic (~1nm) and meso scale (~100nm), hardly reachable by experiment. The starting point of the atomistic scale simulations are aluminosilicate nano-grains generated with a reactive interaction potential. The Potential of Mean Force (PMF) quantifies the potential energy of interactions betweentwo geopolymer grains. It can be computed in various charge conditions to mimic the pH effects, using either a perturbative approach or well-tempered metadynamics. Both methods are compared and their limitations are discussed in the framework of amorphous aluminosilicate nano grains immersed in an electrolyte. Under such analysis, metadynamics is chosen for more thorough investigation of grains cohesion. At low deprotonation level/grain charge attraction is observed. These results shed light on the role of oligomers deprotonation that appears to be key point for the gel formation.A view of the system as “meta-grains” is proposed based on the evolution of grain geometry and ionic polarization. In this view, we decompose the global PMF into fundamental interaction terms at the grain scale, in terms of coulombic, dipole-dipole and dispersion/van der Walls interactions. Metadynamics results are recovered with water dielectric constant chosen based on the water content at the grain-grain interface. At large deprotonation level, the Poisson-Boltzmann repulsion is recovered, with a wet interface and a strong Debye screening. At very short range and low deprotonation level, we found that grain-grain attraction can be related to the formation of very local hydrogen bonds between the hydroxyls of the grains, in a dry interface. Grains then link through iono-covalent bonds with the release to the solution of water molecules and OH groups. This attracto/repulsive behavior is supported by experiments and discussed in regards to the cohesion of clays and cement hydrates.In the last part of the thesis, mesoscale models for the growth of geopolymers are proposed based on the obtained PMFs in attractive conditions. Structures resulting from Coarse-Grained Monte Carlo simulations are characterized in terms of pore size distributions and small angle neutron scattering, discussed with experimental data
Kempfer, Kévin. "Simulation multi-échelle de l'interaction polymère-charge." Thesis, Université Clermont Auvergne (2017-2020), 2019. http://www.theses.fr/2019CLFAC051.
Full textIn the tire industry, the addition of nanosized silica fillers into rubber is a commonly used process due to the outstanding mechanical properties of the resulting composite material. However, the link between the underlying chemistry and the mechanical behavior of this material remains unsolved. The aim of this thesis is to investigate this system using molecular simulation. In order to cover wide length and time scales, inherent to this type of material, we took the route of applying a multiscale simulation strategy. Starting from coarse-grained reference trajectories obtained from higher resolution molecular dynamics trajectories, we build realistic coarse-grained dissipative dynamics models by using the bayesian optimization method. Our models quantitatively predict the characteristic behavior of entangled polymer chains. This multiscale approach, extended to the polymer-silica interaction, allows us to successfully model the thermodynamic, the structural, and the dynamic properties of a system made up of one silica nanoparticle, grafted or not, dispersed in an amorphous polymer matrix. This work opens the way towards the quantitative prediction of the viscoelastic properties of reinforced rubbers on time scales up to the microsecond. These time scales, inaccessible by mean of an atomistic description, are now reachable thanks to our coarse potentials
Dupleix-couderc, Chloé. "Sur une stratégie multi-échelle d'analyse des grands délaminages en dynamique transitoire." Phd thesis, École normale supérieure de Cachan - ENS Cachan, 2011. http://tel.archives-ouvertes.fr/tel-00719090.
Full textDupleix-Couderc, Chloé. "Sur une stratégie multi-échelle d'analyse des grands délaminages en dynamique transitoire." Thesis, Cachan, Ecole normale supérieure, 2011. http://www.theses.fr/2011DENS0013/document.
Full textThe part of composite materials in aeronautic structures is increasing due to their specific properties and the mass reduction they enable. Accurate numerical simulations are thus needed in order to design these structures, particularly to verify if they could resist dynamic charges such as soft bodies impact. Nevertheless, using a refined model to represent phenomenon such as delamination leads to computing time and dofs number incompatible with an industrial context. The aim of the present work is to propose a multi-scale method in space and time to solve dynamic impact problems on laminate structures. A domain decomposition method for dynamic problems is first used to couple different kinds of models and time discretisations. A refined model for the laminate is used in the degradating areas only - elsewhere, a coarser representation using 3D-shell elements is used. This approach reduced the cost of the simulation giving accurate results. To avoid a remeshing due to delamination propagation within the structure, a multi-scale method is then proposed. A global 3D shell elements mesh for the whole structure is defined. Local meshes based on a refined representation of the laminates are used only if required. Coupling between global and local representation is done using velocity field
Books on the topic "Dynamique multi-échelle"
Morosanu, Gabriela Adina. La dynamique hydro-sédimentaire du bassin de la rivière Jiu : approche systémique et multi-échelle. Editura Universitara, 2021. http://dx.doi.org/10.5682/9786062812034.
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