Tesi sul tema "Modélisation et simulation la chromatographie"
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Zhong, Guoming. "Contribution à l'étude de l'adsorption dans une colonne : modélisation et simulation numérique". Compiègne, 1991. http://www.theses.fr/1991COMPD373.
Navarro, Barragan Alberto. "Etude d'un procédé de séparation chromatographique en continu : modélisation et mise en oeuvre d'un séparateur à trois sorties fonctionnant en simulation de lit mobile". Toulouse, INPT, 1997. http://www.theses.fr/1997INPT040G.
Irankunda, Rachel. "Nickel Chelating Peptides & Chromatography : From Peptides Separation Simulation up to their Antioxidant Activities - related Applications". Electronic Thesis or Diss., Université de Lorraine, 2023. http://www.theses.fr/2023LORR0213.
Metal-Chelating Peptides (MCPs), from protein hydrolysates, present various applications in nutrition, pharmacy, cosmetic etc. Yet, the empirical approach generally used to discover bioactive peptides from hydrolysates is time consuming and expensive due to many steps of fractionation, separation and biological activities evaluation. Thus, this PhD aimed to develop a novel approach for MCPs separation prediction using chromatography modelling and simulation based on the analogy between Immobilized Metal ion Affinity Chromatography (IMAC) and Surface Plasmon Resonance (SPR). For the first time, the SPR-IMAC analogy was experimentally investigated on 22 peptides and 70% of them validated this analogy, since peptides well retained in IMAC were also endowed with a good affinity for Ni2+ in SPR. In the second time, peptides with high affinity for Ni2+ (i.e low dissociation constant KD in SPR and a high retention time in IMAC) were used to study the modelling and simulation of peptide concentration profiles at the column outlet in IMAC. Since knowledge of adsorption isotherms was required to perform simulation, it was necessary to develop a methodology for predicting Langmuir isotherm parameters in IMAC from SPR data. The validity of simulation was evaluated by comparing experimental and simulated retention times that should be close for reliable prediction. Therefore, several approaches were evaluated to determine Langmuir sorption parameters, the most interesting one introduces a correction factor on the maximum adsorption capacity qmax alone, assuming that the affinity of peptides for immobilized Ni2+ did not change depending on the technology used (SPR vs. IMAC), thus affinity constant KA was not modified. Meanwhile, industrial application of MCPs and hydrolysates were studied. First, pea protein hydrolysates were produced by either Alcalase® followed by Flavourzyme® (Alc+Flav≤1kDa) or Protamex® followed by Flavourzyme® (Prot+Flav≤1kDa). SwitchSENSE® technology evidences the presence of Ni2+ chelating peptides and antioxidants tests showed that Prot+Flav≤1kDa has higher radical scavenging and reducing power, related to its higher degree of hydrolysis and small-size peptides quantity. Secondly, pea hydrolysates and MCPs were investigated for their ability to inhibit the lipid oxidation in emulsions. They slowed down lipid oxidation through chelation of prooxidant (metals such as Fe2+) reducing primary and secondary oxidation products responsible of deterioration of lipid containing products. Thus, pea hydrolysates and MCPs could be used as antioxidants in food and cosmetic products, as alternative to chemicals such as EDTA, BHT and TBHQ
Vincent, Axel. "Conception et simulation d'un réacteur fil-cylindre à décharge couronne avec barrière diélectrique adapté au traitement des oxydes d'azote dans des effluents marqués par un isotope". Paris 6, 2002. http://www.theses.fr/2002PA066477.
Bellot, Jean-Christophe. "Modélisation de la chromatographie préparative non-linéaire des biomolécules". Toulouse, INSA, 1994. http://www.theses.fr/1994ISAT0034.
Amrani, Morade. "Modélisation et simulation d'objets déformables". Lyon 1, 2002. http://www.theses.fr/2002LYO10256.
Li, Jing-Rebecca. "Modélisation et simulation de la diffusion". Habilitation à diriger des recherches, Université Paris Sud - Paris XI, 2013. http://tel.archives-ouvertes.fr/tel-00925028.
Denis, Roland. "Modélisation et simulation de l'effet Leidenfrost". Thesis, Grenoble, 2012. http://www.theses.fr/2012GRENM111/document.
The Leidenfrost effect is a special case of calefaction: when a liquid is dropped on a surface which temperature is far hotter than the liquid's boiling point, he evaporates before touching the hot plate and the produced gas forms a thin layer, under the liquid droplet, that makes it hovering and isolates it from the heat source.This thesis deals with the modeling and the numerical simulation of this complex phenomenon. In the first part, we study a sharp interface model that supplement the Navier-Stokes equations with interfacial conditions taking into account the phase change and the surface tension. Simulating an uniform liquid layer over a vaporous film reduces the problem to one dimension. The ALE method (Arbitrary Lagrangian Eulerian) is then used to deal with the variable height of each phase. The numerical code is finally validated on a test case.In the second part, the gas/liquid interface is captured by a Level-Set method. The interface is artificially thickened and inner regularization is applied to the thermodynamic quantities. Therefore, surface tension and phase change are approximated by volume terms. Each pure phase is supposed to be incompressible but, due to the phase change, the velocity field is not divergence-free in the interfacial zone.The third part focusses on the discretization of this three-dimensional model, for the simulation of a motionless and rotational symmetric droplet. The problem reduces to an axisymmetric two-dimensional setting. The use of the Level-Set method requires devoted numerical algorithms which are developed: non-diffusive efficient advection scheme, reinitialization by Hamilton-Jacobi equation with global volume correction taking into account the phase change. An adapted Chorin projection algorithm is used to ensure the prescribed compressibility constraint that holds on the interfacial fluid. In addition, we introduce a new finite difference scheme for the gradient approximation that uses a compact stencil.The last part describes and compares our simulation results with several theoretical curves based on different droplet shape simplifications, plotting the evolution of indicators like the volume and radius of the droplet, or the height of the vapor layer
Jugnon, Vincent. "Modélisation et Simulation en Photo-acoustique". Palaiseau, Ecole polytechnique, 2010. http://pastel.archives-ouvertes.fr/docs/00/54/59/73/PDF/these_vincent.pdf.
Sur la plateforme de thèses en ligne Tel on trouve le résumé suivant en anglais : This thesis deals with the problem of photoacoustic imaging. In this imaging setting, one heats a medium up with an electromagnetic wave. The medium dilates and emits an ultrasonic wave. The aim is then to reconstruct inner properties of the medium from boundary measurements. It is an inverse problem on the initial condition for the wave equation. In an idealized frame, the reconstruction procedure has been thoroughly studied. The main goal of this thesis is to stray from the standard model by considering less restrictive assumptions. For each of them (boundary condition, partial view, attenuation, inhomogeneous sound speed) the thesis proposes a correction based on adapted mathematical tools (asymptotic analysis, dual approach , correlation. . . ). Reconstruction of the initial condition of the wave equation is however not enough. It depends on the electromagnetique illumination. A second inverse problem has to be solved on the electromagnetic wave propagation to acces the physical coefficients of interest. The thesis presents algorithmic results in the frame of the diffusion equation and theoretic estimates in the frame of the transport equation. The thesis also presents an improving result for a topological derivative based imaging approach
Abdelwahed, Mohamed. "Modélisation et simulation numérique d'écoulements diphasiques". Pau, 2002. http://www.theses.fr/2002PAUU3014.
A good understanding of the eutrophication treatment through aeration requires a two phase modelling (water-air bubbles) leading to many difficulties. In this work, we present two simplified models of which the idea consists on studying the water phase flow and to take account of the effect of the bubbles, for the first model, by a boundary condition on the level of the injector and for the second model, by adding some corrections terms originating from two-phase flow models. The numerical results are achieved through the combination of the characteristic method for the time discretization and the P1+bubble P1 finite element for the spatial approximation. Numerical results are presented for a real application case. In order to reduce the computational costs of our problem, we present a parallel version of a solver treating the first model. Some performance results are finally presented
Benadla, Zahira. "Modélisation et simulation thermomécanique du soudage". Compiègne, 2005. http://www.theses.fr/2005COMP1571.
This research is concerned with the prediction of residual constraints and distorsions generated by, welding process. A finite elements model based on semi-coupled thermomechanical analyses is proposed and validated on tests. Ln a first time, a axisymetric structure is studied. Ln this analysis gradients of temperature and contraints are imposed. This test permit us to validate the thermomechanical behavior law and to choose the most representative hardening (kinematic or isotropic). Then, a real operation of welding is considered. Ln this example a mobile heat source is used. A tridimensional simulation is studied and compared to measures. These measures also act as support to identify a heat source parameters. Finally, a mixed model is proposed. This model permit to reduce computational times. A numerical comparison of mixed model results with molumic model results allowed us to validate development
Promayon, Emmanuel. "Modélisation et simulation de la respiration". Phd thesis, Grenoble 1, 1997. https://theses.hal.science/tel-00130070.
Promayon, Emmanuel. "Modélisation et Simulation de la Respiration". Phd thesis, Université Joseph Fourier (Grenoble), 1997. http://tel.archives-ouvertes.fr/tel-00130070.
Dans une première partie les principes mécaniques du phénomène de la respiration sont exposés. Le problème apparaît alors comme la modélisation et la simulation comportementale sous contraintes d'un objet complexe composés de régions ayant des propriétés différentes (élasticité, motricité, rigidité). Les modèles générateurs basés sur la physique se révèlent être les outils informatiques les plus aptes à atteindre notre objectif. Un état de l'art de ces méthodes et des problématiques liées est alors dressé.
La deuxième partie présente la construction du modèle informatique découpée en régions de propriétés spécifiques. On présente alors une nouvelle fonction d'élasticité utilisant l'expression d'une mémoire de forme locale. Comparée à un modèle classique masse-ressort, cette fonction d'élasticité prouve son efficacité. La modélisation des régions musculaires et solides est ensuite présentée. Puis, on montre la possibilité de contraindre ces régions afin de modéliser d'autres propriétés. On développe notamment une méthode de résolution directe permettant de vérifier des contraintes locales et globales sans utiliser d'algorithme itératif. La résolution de la contrainte d'incompressibilité illustre cette méthode de résolution ; les principes généraux de cette résolution sont dégagés permettant ainsi de généraliser son application.
La dernière partie de ce manuscrit fournit une validation qualitative du modèle développé par l'intermédiaire de différents exemples, dont celui de la simulation des mouvements du tronc pendant la respiration.
Daubas, Bruno. "Modélisation et simulation des procédés continus et discontinus". Toulouse, INPT, 1994. http://www.theses.fr/1994INPT023G.
Jiao, Ying. "Risque de crédit : modélisation et simulation numérique". Phd thesis, Ecole Polytechnique X, 2006. http://pastel.archives-ouvertes.fr/pastel-00002180.
Multon, Franck. "Analyse, Modélisation et Simulation du Mouvement Humain". Habilitation à diriger des recherches, Université Rennes 1, 2006. http://tel.archives-ouvertes.fr/tel-00441143.
Isèbe, Damien. "Modélisation, simulation et optimisation en génie côtier". Phd thesis, Université Montpellier II - Sciences et Techniques du Languedoc, 2007. http://tel.archives-ouvertes.fr/tel-00260682.
Baranger, Céline. "Modélisation, étude mathématique et simulation des collisions". Phd thesis, École normale supérieure de Cachan - ENS Cachan, 2004. http://tel.archives-ouvertes.fr/tel-00008826.
Le premier résultat que nous présentons est consacré à l'étude mathématique d'un couplage entre une équation cinétique de type Vlasov et les équations d'Euler isentropiques. Ces équations modélisent un spray fin. Nous démontrons l'existence en temps petit d'une solution régulière pour le couplage Vlasov-Euler isentropique.
Ensuite, nous présentons les équations précises relatives à la modélisation des collisions, coalescences et fragmentations dans un spray.
Nous décrivons par la suite la simulation numérique du couplage fluide-cinétique dans un code industriel (Commissariat à l'Énergie Atomique), en particulier l'ajout des phénomènes de collisions.
Un deuxième modèle de fragmentation est également présenté. Ce modèle est plus pertinent dans les cas où les particules de la phase dispersée ont un grand nombre de Weber.
Enfin, nous présentons un résultat concernant une estimation explicite de trou spectral pour l'opérateur de Boltzmann avec potentiels durs linéarisé, et pour l'opérateur de Landau avec potentiels durs linéarisé.
Seguin, Nicolas. "Modélisation et simulation numérique des écoulements diphasiques". Phd thesis, Université de Provence - Aix-Marseille I, 2002. http://tel.archives-ouvertes.fr/tel-00003139.
Lontos, Athanasios. "Modélisation et simulation 3D de la morphogenèse". Thesis, Grenoble, 2013. http://www.theses.fr/2013GRENM064/document.
The embryo of the Drosophila Melanogaster undergoes a series of cell movements during its early development. Gastrulation is the process describing the segregation of the future internal tissues into the interior of the developing embryo. Gastrulation starts with the formation of the ventral furrow, a process commonly known as the ventral furrow invagination. During this process, the most ventrally located blastoderm cells flatten and progressively constrict their apical sides until they are wedge shaped. As a result of these cell-shape changes, the blastoderm epithelium first forms an indentation, the ventral furrow, which is then completely internalized. We focus on the study of the mechanisms that drive the invagination. The main questions that gave birth to this thesis are: “What is the role of the apical constriction of the ventral cells in the invagination?” and “Once the ventral cells are internalized, what is the mechanism that drives the ventral closure?” We attempt to answer to these two questions from a biomechanical point of view. For this purpose, a 3D mesh of the embryo of the Drosophila Melanogaster has been created. Based on this mesh, two “a minima” biomechanical models of the Drosophila embryo have been created, a physically based discrete model and a model based on the Finite Element Method. The results of the simulations in both models show that the geometry of the embryo plays a crucial role in the internalization of the ventral cells. The two models efficiently simulate the internalization of the ventral cells but are incapable of reproducing the ventral closure. We hypothesize that the ventral closure can be explained by the interplay of forces developed in the embryo once the internalized ventral cells undergo cell division. We propose an approach to divide elements in a Finite Element Mesh and we integrate it to the Finite Element Model of the Drosophila Melanogaster
Huberson, Serge. "Modélisation asymptotique et simulation numérique d'écoulements tourbillonnaires". Paris 6, 1986. http://www.theses.fr/1986PA066589.
Bourdat-Sesmat, Sylvie. "Modélisation, simulation et commande d'une servovalve électropneumatique". Lyon, INSA, 1996. http://www.theses.fr/1996ISAL0019.
This thesis deals with modelling, simulation and control of an electropneumatic power modulator which is a three-way servovalve. Concerning the pneumatic flow stage modelisation, the first chapter recalls different flow laws which could exist in the flow stage restrictions. An equivalent scheme is established from the flow stage geometry. The results of the classical experimental characterisation of the servovalve parts of the Wheatstone bridge are described. In the second chapter, a critical analysis of the existing modelisation methods is carried out. A new method of characterisation and modelisation of the pneumatic stage using a global pneumatic characterisation is proposed and validated. The third chapter presents the modelisation of the electromechanical actuator: a proportional magnet. An analysis of the calculation schemes and of the characterisation procedures of the two principal types of models using either the flux linkage or the current is carried out with the help of a bond graph modelisation tool. This reflexion led to the proposition of a more complete notation on the two port energy storage bond graph element IC in integral causality. The complete model of the electromechanical part is described in the fourth chapter. The study of the position control of servovalve together with the results of the experimental and simulated study of the positioning dynamic behavior are presented in the same chapter
Desbenoit, Brett. "Modélisation et simulation de scènes naturelles complexes". Lyon 1, 2006. http://www.theses.fr/2006LYO10214.
In this thesis, we address the modelling realistic natural sceneries. We focus on the modelling of details and their distribution in a complex scene. Details have a great impact over the overall realism of the final scene. Our approach consists in modeling details such as mushrooms, lichens, leaves or fractures and storing them in an atlas of shapes. Those details are distributed in the scene according to specific physically and biologically based dispersion and propagation algorithms, which are controlled by the parameters of the environment such as the wetness, the temperature or the amount of direct and indirect lighting. Our approach enables us to add a vast variety of details without the burden of editing them by hand
Tavares, Mathilde. "Simulation et modélisation multi-échelle d'écoulements diphasiques". Thesis, Paris Est, 2019. http://www.theses.fr/2019PESC2021.
Several problems surrounding us can be associated with immiscibe two-phase flows. On large scales, this is the case of environmental problems such as wave breaking. On a smaller scale, we find these flows in the field of land transport, maritime, aeronautical and space such as fuel injection in engines. With a wide range of interface sizes ranging from meter to nanometer, these problems are clearly multi-scale. The understanding and the characterization of these flows are of capital importance but are made difficult because the experiments remain limited for these problems and it is the same for the theoretical studies. Modeling and simulation of these flows is then an interesting alternative. Although important progress has been made on the simulation of multiscale two-phase flows, simultaneously capturing small and large scales of the interface while accurately representing topological changes remains a major difficulty. This work is based on the development of a unified modeling taking into account all the interfacial scales, from the separated phase to the scale of the small dispersed interfaces in order to answer the needs of the real problems. In this context, a front-tracking method has been developed for precise monitoring of interfaces. This method has been tested validated using several analytical configurations and comparisons made with several interface tracking methods of the literature has shown that the front-tracking method developed in this work was one of the most precise. A method of interpolation of velocities based on the jump of the physical properties at the interface has been constructed and validated. The front-tracking interface tracking method has been integrated into the 1-fluid model, developed in the FUGU house code, solving incompressible two-phase Navier-Stokes flows. A different choice of implementation of the capillary term based on the direct calculation of the capillary contribution in a cell cut by the interface has shown interesting results with the reduction of parasitic currents in the case of the static bubble. We also present in this work a discontinuous 2-fluid model coupled to the developed front-tracking method, discretized on a structured Cartesian grid in order to increase the resolution accuracy of two-phase phase separated flows
Brault, Gilbert. "Modélisation, commande et simulation d'ilots flexibles d'assemblage". Besançon, 1986. http://www.theses.fr/1986BESA2030.
Bouchereau, Stéphane. "Modélisation et simulation numérique de l'électro-mouillage". Université Joseph Fourier (Grenoble), 1997. http://www.theses.fr/1997GRE10064.
Djouwe, Meffeja Merline Flore. "Simulation et modélisation de milieux granulaire confinés". Rennes 1, 2012. http://www.theses.fr/2012REN1S005.
Because of their industrial and geophysical applications, granular flows have a prominent place in our environment. In this thesis, we study these flows by numerical simulation of type "discrete elements" (where the grains are treated explicitly) and of type "continuous medium" (where the granular material behaves as an effective medium obeying a given rheology). We first studied the granular flows by the "discrete elements" method in silo geometries. By changing the micro-mechanical properties of the grains (restitution and friction) we showed that they had a significant influence on the flow discharge. A detailed study of the behavior of grains has shown that this influence comes from a variation of the packing fraction at the outlet of the silo, the grains velocity experiencing very little change. Although models such as "discrete elements" provide access to all the individual properties of the grains, they have one major drawback : the computation time is very important that prohibits the modeling of geophysical and industrial situations. To overcome this problem, we used the "continuous medium" approach, which consider that the granular medium studied follows a rheology recently proposed in the literature. After discussing the numerical implementation, we have studied this rheology for steady and fully developed flows with a semi-analytical method in two configurations: a shear cell and a channel. This allowed us to highlight the differences between a granular medium and a Newtonian fluid
Lélias, Guillaume. "Assemblages collés : modélisation, simulation et caractérisation expérimentale". Thesis, Toulouse, ISAE, 2016. http://www.theses.fr/2016ESAE0014/document.
In the frame of an internal research program called JoSAT (Joint Stress Analysis Tool), SogetiHigh Tech has suggested developing since 2008 a simplified tool for the stress analysis ofadhesively bonded joints. This tool allows for the distribution of both the internal forces anddisplacements in the adherends as well as the adhesive stresses along the overlap to beestimated from specified loads and boundary conditions, and has the advantage of beingextremely time saving compared to conventional Finite Element (FE) analyses.In 2011, this tool was extended to support adhesive material nonlinearities in the form ofspecified adhesive stress-strain evolution laws. However the theory developed wasdemonstrated as valid for the Single-Lap Joint (SLJ) configuration only, and limited to smalllevels of adhesive material nonlinearities. In this context, the objective of the thesis is double. First, extend and validate the simplified tool for the analysis of adhesively bonded joints in the case of nonlinear adhesive as well asadherends stress-strain constitutive behaviors. Then, suggest and develop experimentalprotocols for the characterization of the cohesive properties of thin adhesive layers so that thesimplified tool can be sustained with relevant experimental data in terms of adhesive stressstainconstitutive relationships
Hassine, Hichem. "Modélisation, simulation et optimisation pour l'éco-fabrication". Thesis, Châtenay-Malabry, Ecole centrale de Paris, 2015. http://www.theses.fr/2015ECAP0016/document.
This thesis focuses on the proposal and implementation of approaches for modeling sustainable manufacturing. These approaches are used to prepare and simulate a process of manufacturing products providing coupling between environmental and economic objectives.The approaches developed in this thesis are based on the concepts of decision support as well as multi-objective optimization. The decision support allows intervention in two different levels: the choice of indicator to quantify the environmental impacts and the choice of the final manufacturing scenario. For multi-objective optimization, it provides the coupling between the two main pillars of sustainable manufacturing: ecology and economy. In terms of multi criteria decision aid methods, Evamix and Promethee were applied, while particulate swarms were developed as part of the multi-objective optimization. These approaches have been applied initially to some machining operations: turning and milling. Finally, the production line of phosphoric acid and sulfuric acid were the subject of application of the two approaches developed
Zaatiti, Hadi. "Modélisation et simulation qualitative de systèmes hybrides". Thesis, Université Paris-Saclay (ComUE), 2018. http://www.theses.fr/2018SACLS493/document.
Hybrid systems are at the core of cyber-physical systems. Such systems represent the interaction between continuous physical processes generally modelling the environment with discrete decisions from control electronic signaling. The verification of these systems is crucial to ensure safety at the modeling stage. The application of hybrid systems is present in many fields such as transportation, biology and avionics. The thesis studies principals from the qualitative reasoning domain and applies them to the verification of hybrid systems. The accomplished work elaborates methods to abstract a hybrid system using qualitative principles. These methods consist in discretizing the state space to a finite number of states while conserving qualitative characteristics. The computed abstraction allows to prove properties at the level of the concrete hybrid system and presents a representation of the global behavior of the system. A tool developed in C++ computes the abstraction of a given hybrid system. An evaluation of its performance is performed. We are also interested in a particular property called diagnosability. The system is said to be diagnosable when it is capable to identify modeled faults using limited specified observations. A method that uses the computed abstraction to verify diagnosability of a given hybrid system is proposed
Morcos, Noura. "Modélisation mathématique et simulation de systèmes microvasculaires". Paris 6, 2011. http://www.theses.fr/2011PA066168.
Suwondo, Endy. "Simulation et optimisation d'une opération de séparation par chromatographie en phase liquide". Toulouse, INPT, 1992. http://www.theses.fr/1992INPT066G.
Ben, Salah Fatma. "Modélisation et simulation à base de règles pour la simulation physique". Thesis, Poitiers, 2018. http://www.theses.fr/2018POIT2293.
The physical simulation of deformable objects is at the core of several computer graphics applications. In this context, we are interested in the creation of a framework, that combines a topological model, namely Generalized Maps, with one or several mechanical models, for the physical animation of deformable meshed objects that can undergo topological modifications such as tearing or fractures.To obtain a general framework, we chose to rely on graph manipulation and transformation rules, proposed by the JERBOA software. This environment provided us with fast prototyping facilities for different mechanical models. It allowed us to precisely define how to store mechanical properties in the topological description of a mesh and simulate its deformation in a topologically-based manner for interaction computation and force distribution. All mechanical properties are stored in the topological model without any external structure.This framework is general. It allows for the simulation of 2D or 3D objects, with different types of meshes, including non homogeneous ones. It also allowed for the simulation of several, continuous or discrete, mechanical models with various properties of homogeneity and isotropy. Furthermore, different methods to simulate topological modifications have been implemented in the framework. They include both the selection of a criterion to trigger topological modifications and a transformation type. Our approach also managed to reduce the number of updates of the mechanical model after tearing / fracture
Bonnefis, Denet Félicie. "Développement et modélisation de procédés de chromatographie préparative avec éluant supercritique : modes élution et lit mobile simulé". Vandoeuvre-les-Nancy, INPL, 2002. http://www.theses.fr/2002INPL050N.
Chenou, Catherine. "Cinétique et modélisation de l'adsorption de la serum albumine bovine en chromatographie d'échange d'ions". Vandoeuvre-les-Nancy, INPL, 1993. http://www.theses.fr/1993INPL088N.
Chajmowicz, Henri. "Modélisation et simulation numérique de structures articulées flexibles". Phd thesis, Marne-la-vallée, ENPC, 1996. http://pastel.archives-ouvertes.fr/pastel-00569038.
Lorentz, Eric. "Modélisation et simulation numérique de l'endommagement des structures". Habilitation à diriger des recherches, Université Pierre et Marie Curie - Paris VI, 2008. http://tel.archives-ouvertes.fr/tel-00473965.
Fusco, Nicolas. "Analyse, modélisation et simulation de la marche pathologique". Phd thesis, Université Rennes 2, 2008. http://tel.archives-ouvertes.fr/tel-00293627.
Puig, Bénédicte. "Modélisation et simulation de processus stochastiques non gaussiens". Phd thesis, Université Pierre et Marie Curie - Paris VI, 2003. http://tel.archives-ouvertes.fr/tel-00003526.
De, lorenzo Marco. "Modélisation et simulation numérique des écoulements diphasiques métastables". Thesis, Université Paris-Saclay (ComUE), 2018. http://www.theses.fr/2018SACLX029/document.
This Ph.D. thesis deals with the metastable two-phase flows typical of accidental transients that could occur in nuclear power plants. Those phenomena are of difficult treatment due to the topological difficulty of the flow, the interphase transfers and the strong coupling between thermodynamic features and mathematical aspects.The methods today in use in industry do not fully describe the complexity of these flows because based on too simple models. In fact, they do not take into account the thermo-chemical disequilibrium between liquid and vapor water. On the other hand, the hyperbolic methods recently proposed in the literature for the simulation of metastable flows can not be used in the industry because based on simple equations of state that are not adequate for industrial calculations.The purpose of this Ph.D. thesis is to develop a new approach that couples the modern hyperbolic methods to accurate equations of state. The final product of this work is a new model for the industrial analysis of metastable two-phase flows that incorporates novel techniques for the calculation of interfacial transfers and of steam-water properties. Moreover, it is computationally affordable for its use in industrial configurations.The methods developed in this thesis have been sistematically verified against exact solutions and validated using experimental data of the literature
Cattaneo, David. "Modélisation graphique et simulation en traitement d'information quantique". Thesis, Université Grenoble Alpes (ComUE), 2017. http://www.theses.fr/2017GREAM076/document.
Graph States formalism consist in using graphs to model quantum states. This formalism allows us to use notion and tools of graph theory (e.g. flow, domination, probabilistic methods) in quantum information processing. Last years, this combinatorial modelisation had lead to many decisiv breakthroughs, in particular (i) in the comprehension of the quantum entranglement properties (ii) in very promising in term of physical implementation quantum calculus model, and (iii) in the analysis and construction of quantum cryptography protocols. The goal of this thesis is to study the graphic properties emerging of those quantum information processing problematics, especially for quantum simulation. In particular, the properties of causality and locality in graph states, by extanding for exemple the existing notion of causality flows to a notion integring the locality constraints, would allow new perspectives for the quantum system simulation using graphs states. Formal connections with noisy quantum cellular automata would emerge from this study
Jimenez, Stéphane. "Modélisation et simulation physique d'objets volumiques déformables complexes". Grenoble INPG, 1993. http://www.theses.fr/1993INPG0170.
Médéric, Pascal. "Modélisation unidimensionnelle et simulation expérimentale du cathéterisme cardiaque". Toulouse, INPT, 1991. http://www.theses.fr/1991INPT003H.
Beaume, Grégory. "Modélisation et simulation de l'écoulement d'un fluide complexe". Phd thesis, Paris, ENMP, 2008. http://pastel.paristech.org/5458/01/these_G-Beaume.pdf.
This work is dedicated to numerical simulation of flow of solid-liquid mixtures. The fluid flow obeys a Newtonian behavior and suspended particles are modeled by rigid spheres or sticks. This suspension is appropriate for composites injection molding. Our goal is to better understand the rheological behavior of such a mixture under a shear flow. So we consider the evolution of this mixture in a cubic cell, under a shear flow, with pseudo-periodic boundary conditions. We extend the velocity-pressure equations to solid domain by adding a rigid constraint. Thus we obtain a system of velocity-pressure equations defined on the whole fictitious domain that we solve by a Finite Element method. In this multidomain approach, we have to follow the evolution of the positions of solid particles. The solid domain is represented by a characteristic function. A lagrangian transport is used to update the positions of particles, and the corresponding characteristic function is deduced at any time thanks to a Level-Set method. A collision algorithm is used after this transport to correct positions and prevent particles from interpenetrating. Homogenization calculus have been done in order to estimate equivalent viscosity for suspensions of spheres, and behavior laws and models for evolution of orientation tensors in suspensions of fibers. Boundary effects are reduced thanks to pseudo-periodic boundary conditions. Moreover the interface description is improved by a h-adaptation technique. Our results are in rather good agreement with theoretical models, and a first simulation of a 3D mixture flow is presented
Bakalem, Mohammed. "Modélisation et simulation orientées objet des systèmes manufacturiers". Chambéry, 1996. http://www.theses.fr/1996CHAMS020.
Cordier, Stéphane. "Modélisation mathématique et simulation numérique du plasma magnétosphérique". Cachan, Ecole normale supérieure, 1994. http://www.theses.fr/1994DENS0010.
Seltner, Philippe. "Modélisation et simulation temporelle du système ligne-parasurtensions". Ecully, Ecole centrale de Lyon, 1992. http://www.theses.fr/1992ECDL0006.
Martinez, Alexandre. "Accéléromètres thermiques à convection : modélisation, simulation et caractérisation". Montpellier 2, 2003. http://www.theses.fr/2003MON20086.
Leprêtre, Florian. "Méta-modélisation, simulation et optimisation de flux urbains". Thesis, Littoral, 2020. https://tel.archives-ouvertes.fr/tel-03178850.
The efficient design and planning of urban infrastructure is a key issue for urban planning experts who want to achieve reliable and sustainable mobility for city dwellers. Ever-changing cities and changing population habits prompt urban planners to constantly reinvent their use of urban space in order to contribute to the fluidity of travel and passenger safety, while limiting the environmental impacts of traffic flows. Numerous optimization methods can be used to solve a variety of problems associated with urban mobility issues, such as optimizing traffic light settings, designing reliable road networks or optimizing the planning of a publix transit system. However, these methods are generally designed and parameterized for the study of very specific urban spaces, and seem difficult to generalize to other cities in the world for mobility optimization. Therefore, this paper introduces a methodology for modeling, simulation and optimization of urban flows. The reported work proposes a rigorous analysis of the intrinsic characteristics of urban mobility optimization problems, in order to achieve a better understanding of these challenges, and to enable the design of robust and efficient optimization algorithms. Finally, the work reported in this thesis aims to stimulate reflection on mobility problems, based on the views of urban planners and optimization experts, in order to achieve optimal and sustainable urban mobility
Farahmandpour, Chia. "Modélisation et simulation du comportement des bétons confinés". Thesis, Paris 6, 2017. http://www.theses.fr/2017PA066550/document.
For the past two decades, externally bonded Fiber Reinforced Polymers (FRP) has gained much popularity for seismic rehabilitation of reinforced concrete (RC) columns. In this technique, FRP wrap installed on the surface of a column acts as lateral confinement and enhance the strength and deformation capacity of the concrete element. Although many experimental works have been devoted to the study of confining effect of FRP on the behavior of RC columns, the numerical simulation of FRP-jacketed RC columns remains a challenging issue due to the lack of appropriate constitutive model for confined concrete. In this study, a damage plastic model is developed to predict the behavior of concrete under triaxial stress states. The proposed model takes into account different material behavior such as irreversible strain, damage due to microcracking, confinement sensitivity and dilation characteristic. A straightforward identification process of all model’s parameters is then presented. The identification process is applied to different normal strength concrete. The validity of the model is then demonstrated through confrontation of experimental data with simulations considering active confined concrete and FRP confined concrete with a wide range of confinement stiffness. The proposed constitutive model is also compared with other models from the literature and the distinguishing features of this new model are discussed. Furthermore, the capacity of the model in the three-dimensional finite element analysis of full-scale RC columns is demonstrate and discussed