Дисертації з теми "Système de couplage lâche"
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Urasadettan, Jennifer. "Culture d'entreprise et dynamique organisationnelle : contribution à une redéfinition : le cas du groupe hospitalier mutualiste." Montpellier 2, 2009. http://www.theses.fr/2009MON20269.
Повний текст джерелаFajfrowski, Dominique. "Le rôle du contrôle de gestion dans une stratégie de développement durable de l'entreprise." Thesis, Montpellier 1, 2011. http://www.theses.fr/2011MON10005.
Повний текст джерелаSo as to study the role of management control in the sustainable development of the firm, we first propose a conceptual framework based on a review dealing with Corporate Social Responsability and Control. Secondly, an exploratory study will complete the research.These theorical and empirical investigations lead us to offer the fallowing proposition : facing the double challenge of efficiency and legitimacy, the firm implements control protocols aiming to both establish a diagnosis and interact. This juxtaposition allows to answer in a rational way to the different stakeholders, while the different domains of the overal performance are isolated. This pratice establishes the part of management control as monotoring financial and managing logics first. It then participates to the processus of balancing the system of governance,the strategy and the control.This changing of the business model clashes with technical and cultural difficulties, hence we can observe a phenomenon of tigher or looser coupling between the ideals of the sustainable development and the every day working of the firm
Herrera, gamba Diana. "Analyse du couplage personne-système haptique." Phd thesis, Université de Grenoble, 2012. http://tel.archives-ouvertes.fr/tel-01018774.
Повний текст джерелаHerrera, Gamba Diana. "Analyse du couplage personne-système haptique." Thesis, Grenoble, 2012. http://www.theses.fr/2012GRENS021/document.
Повний текст джерелаThe work described in this document deals with the problem of human-haptic system dynamic coupling. We propose a study of this kind of coupling based on the hypothesis of a temporary hybrid system. Under this hypothesis, the system formed during the coupling can be considered as a dynamic system in which the two parties that compose it cannot be separated. This is multidisciplinary topic, situated at the intersection of cognitive science, automation and haptics. The first part of the document includes a state of the art on the analysis of coupling in these three areas, the description of the problem and the methodology for the study as well as a proposal of gesture typology. In this study of coupling, we are interested in a particular group of actions, such as periodic movement and passive gesture in a situation of haptic simulation and also, in the interaction models able to generate them. The general method is to define the approaches for modeling the hand-haptic device coupling and then perform an analysis of the coupled system by acquiring system data during the coupling and using parameter identification methods to characterize the models. The final section describes the implementation of the device for the experimental analysis of coupling during simulation with a haptic interaction. This device allows data acquisition for gesture analysis. We also present the study of the haptic simulator to establish the equivalence between virtual parameters introduced to and returned by the simulator and real physical parameters. Then, we describe the experimental analysis of different proposed coupling situations. The experiments performed for this study were performed using the real-time platform ERGON_X, designed by ACROE / ICA. The results of these experiments were used to quantify gesture models and to observe its components, according to established models. Keywords: haptic, haptic interface, human-machine interfaces, real-time simulation, human-object coupling, gesture, physical modeling, parameter identification
Rochat, Jacques. "Modélisation d'un système hôte-parasitoïde en lâcher inoculatif : application au couple Aphis gossypii - Lysiphlebus testaceipes en serre de concombre." Lyon 1, 1997. http://www.theses.fr/1997LYO10196.
Повний текст джерелаFianyo, Yawa Edem. "Couplage de modèles à l'aide d'agents : le système OSIRIS." Paris 9, 2001. https://portail.bu.dauphine.fr/fileviewer/index.php?doc=2001PA090019.
Повний текст джерелаPallard, Christophe. "Couplage non résonnant d'équations aux dérivées partielles hyperboliques." Paris 7, 2004. http://www.theses.fr/2004PA077136.
Повний текст джерелаBezencenet, Odile. "Propriétés et couplage d'échange dans le système modèle : Co/alpha-Fe2O3." Phd thesis, Université Pierre et Marie Curie - Paris VI, 2008. http://tel.archives-ouvertes.fr/tel-00341003.
Повний текст джерелаLes films d'hématite (alpha-Fe2O3) ont été élaborés par épitaxie par jet moléculaire assistée par plasma d'oxygène atomique et ensuite caractérisés avec les techniques usuelles de surface réalisées sous ultra-vide au laboratoire. La croissance, la structure ainsi que les propriétés magnétiques des films minces d'hématite ont été étudiées en détail par de nombreuses expériences réalisées sur grands instruments (rayonnement synchrotron et diffusion de neutrons). Le cobalt est ensuite déposé in-situ sur ces films d'hématite d'une épaisseur de 20 nm. Les différentes expériences ont mené à une description détaillée du magnétisme (moment magnétique, aimantation, domaines...) ainsi qu'à une caractérisation fine du système Co/alpha-Fe2O3 (structure, morphologie...). Une attention particulière a été portée à la description de l'interface, élément déterminant du couplage d'échange. Ce travail expérimental repose sur l'utilisation d'un vaste ensemble de techniques de laboratoire (AES, XPS, RHEED, LEED, MOKE, VSM) complété par des expériences utilisant le rayonnement synchrotron (XAS, XMLD, XMCD, X-PEEM, GIXD, GISAXS) et la diffusion des neutrons.
Bezencenet, Odile. "Propriétés et couplage d'échange dans le système modèle : Co/α-Fe2O3 (0001)". Paris 6, 2008. https://tel.archives-ouvertes.fr/tel-00341003.
Повний текст джерелаAbdennadher, Mohamed-Naceur. "Valorisation de la lignine organocell par le système oxydant ozone-forane 113." Toulouse, INPT, 1987. http://www.theses.fr/1987INPT002G.
Повний текст джерелаSerier, Aicha. "Etude du système prépolymère époxyde-gamma-aminopropyltriethoxysilane : réactions, propriétés et applications aux matériaux composites." Lyon, INSA, 1989. http://www.theses.fr/1989ISAL0037.
Повний текст джерелаJeon, Seyong. "Étude du couplage entre un système de visualisation tridimensionnelle et un modeleur d'objets solides." Compiègne, 1988. http://www.theses.fr/1988COMPD136.
Повний текст джерелаMezeix, Pierre. "Verres et vitrocéramiques du système BaO – TiO₂ – SiO₂ : élaboration, propriétés mécaniques et couplage mécanoélectrique." Thesis, Rennes 1, 2017. http://www.theses.fr/2017REN1S001/document.
Повний текст джерелаGlasses from the BaO – TiO₂ – SiO₂ (BTS) are of great interest for their use as glass-matrix to synthesise fresnoite glass-ceramics. These materials show numerous potential applications as piezoelectric and non-linear optic devices. It has been found that the addition of TiO2 in these glasses improves the cross-linking degree of the glass network as well as the volume density of energy and the glass temperature sensitivity. When the content of titanium is increasing, island-like Si\Ti rich units surrounded by barium-rich channels might form, leading to a similarity between the fresnoite crystal and the glass structure. Thanks to an ultrasonic and thermal heat-treatment it has been possible to control the growth of oriented fresnoite cristallites from the surface of 0,30BaO – 0,20TiO2 – 0,50SiO2 glass. The transparent glass-ceramic shows improved mechanical properties as well as evidence of piezoelectricity. The electrical properties of BTS glasses were investigated with the use of impedance spectroscopy. They show an increase in electric conductivity and dielectric constant as Ti is added to their composition. One explanation lies in the formation of these Ba-rich channels which may improve the ionic conduction. The formation of TiO5 groups would also be responsible for the overall increase in polarizability of the glass. Finally, the effect of an electric field on the glass viscosity was investigated. The glass showed great reduction of its viscosity under high electric field for both AC & DC. When AC field was applied, the material showed no deterioration which might be very interesting for the potential use of this effect for the synthesis of glassy materials
Taurel, Boris. "Etude théorique et expérimentale du couplage optique dans les systèmes optomécaniques." Thesis, Université Grenoble Alpes, 2020. http://www.theses.fr/2020GRALY006.
Повний текст джерелаIn this work, we study ring shaped suspended optomechanical resonators, and Sub-Wavelength Grating (SWG) based optomechanical resonators.The first approach presented - suspended ring resonators - serves as an introduction over general equations and experimental techniques.On a second approach, we propose to co-integrate SWG waveguides inside of a Fabry-Perot cavity. The refractive index of a SWG waveguide is periodic with a pitch way smaller than the wavelength, that results in a lossless propagation with no diffraction effects. The medium can be approximated as uniform, with an averaging effect over its refractive index.In particular, we evidence new optomechanical mechanisms arising from the SWG waveguide, and expect a strong optomechanical coupling strength.All along the thesis, a systematic optical, mechanical, and optomechanical study of each structure is conducted, both with simplified analytical models and numerical simulations. The technological realisation of the structures over 200 mm Silicon wafers is presented, along with optical and optomechanical experimental characterisations
Zarudniev, Mykhailo. "Synthèse de fréquence par couplage d'oscillateurs spintroniques." Phd thesis, Ecole Centrale de Lyon, 2013. http://tel.archives-ouvertes.fr/tel-00804561.
Повний текст джерелаSinding, Alexandre. "Approximation du système Vlasov-Maxwell : étude de solveurs Maxwell pour un couplage avec une méthode particulaire." Paris 9, 2011. https://portail.bu.dauphine.fr/fileviewer/index.php?doc=2011PA090053.
Повний текст джерелаWhen modelling High Power Micro-wave sources (HPM), one has to take into account a partial ionization of particles due to the high energy of the electromagnetic fields at stake : the experimental environnement becomes a plasma and interacts with the fields generated by the initial pulse. One has to deal with a coupling between Maxwell’s equations and Vlasov’s equation, which is a kinetic model of plasmas dynamics. A large number of methods exists for the approximation of Vlasov’s equation, but we mainly focus on one of them, called Particle In Cell (PIC). This method is particularly well suited for modeling interactions with fully discretized Maxwell’s equations on an unstructured grid. To this end, various mixed spectral finite element methods on hexahedral unstructured grids are analyzed and compared with each other. This study mainly focuses on three of them : Nédélec’s second family of curl-conforming elements, a continuous mixed spectral approximation and a Galerkin discontinuous scheme. In all three cases, a spectral study is carried out and shows a large pollution of the spectrum by spurious modes. This pollution is heavily related to the lack of a discrete equivalent of Helmholtz decomposition of H(curl) for the given approximate spaces. A penalization of the methods, inspired by discontinuous Galerkin schemes is then proposed, which allows us to get rid of parasistic waves. Among this penalized methods, we choose the continuous one to be coupled with the PIC approximation of Vlasov’s equation, mainly because of its robustness, but also because of its regularizing effect, from which the particle method can benefit
Follut, Florian. "Etude du système réactionnel induit par le couplage électrons accélérés : catalyseurs lors de l'élimination de phénols." Poitiers, 2006. http://www.theses.fr/2006POIT2364.
Повний текст джерелаHemelsdaël, Romain. "Évolution spatio-temporelle du couplage entre système fluviatile et rifting : étude du rift de Corinthe (Grèce)." Thesis, Université de Lorraine, 2016. http://www.theses.fr/2016LORR0141/document.
Повний текст джерелаRivers behaviour during early rifting can significantly impact on syn-rift sedimentation and the distribution of subsidence. During normal fault growth, existing rivers can be diverted toward subsiding zones. They can respond to footwall uplift either by reversing their flow or by incising into uplifting zones. Long-lived river systems and their stratigraphic record in rifts are poorly documented, not only during early fault propagation and linkage processes but also during successive migrating phases of fault activity. We investigate the interactions of major antecedent rivers with a growing normal fault system and the implications for facies distributions, both on a basin scale and at the scale of individual normal fault blocks. Along the southern margin of the western Corinth rift (Greece), the Plio-Pleistocene fluvial and deltaic successions are investigated. Syn-rift deposits are preserved in a series of uplifted normal fault blocks (10–20 km long, 3–7 km wide). Detailed sedimentary logging and high resolution mapping of the syn-rift deposits document variations of alluvial architecture across the basin and enable to define lithostratigraphic units. Magnetostratigraphy and rare biostratigraphic data are used to date and correlate the alluvial succession between fault blocks. Burial ages were tentatively determined using cosmogenic isotopes 10Be and 26Al produced in situ in quartz grains. Based on the correlation model, we reconstruct the evolution of the early western Corinth rift between about 3.6 and 1.8 Ma. (1) The transverse and antecedent Kalavryta river system flowed and deposited across a series of active normal fault blocks. (2) This river system was inherited from the Hellenide mountain belt and supplied high volumes of coarse sediments from the onset of extension. (3) As depocentres enlarged through time, the fluvial deposits progressively filled palaeorelief. A continuous braided plain developed above active buried faults and no significant consequent drainage system developed between the narrow fault blocks. (4) The main fluvial axis of the antecedent drainage persists through time and controlled facies distribution. (5) The length scale of facies transitions is greater than, and therefore not related to fault spacing. Here, along-strike subsidence variations in individual fault blocks represent a secondary contributor to the alluvial architecture. (6) The zones of maximum subsidence on individual faults are aligned across strike, parallel to the persistent fluvial axis. This implies that long-term sediment supply and loading influenced normal fault growth. Sediment supply largely outpaced local hangingwall subsidence and overfilled the early rift basin. The river system terminated eastward where small deltas are built into a shallow lake that occupied the central Corinth rift. During this time, another river system built fan deltas along the southern margin, recording diachronous deepening of the basin. The behaviour of antecedent rivers is also studied at the scale of a relay zone, that developed later in the rift history between two growing fault segments. During the Middle to Late Pleistocene, the relay zone captured the antecedent Krathis River, which deposited prograding Gilbert-type deltas. Transfer faults record progressive linkage and basinward migration of accommodation along the ramp axis, while marine terraces record diachronous uplift in their footwalls. Although early linkage occurred, the main normal faults continued to propagate until final connexion. For the first time a reconstruction of the linkage phase is presented over a period of ca. 0.5 Myr. Throughout this linkage history, the Krathis River continued to flow across the relay zone. Again, this emphasizes the role of antecedent rivers in supplying sediments and controlling the location of the major depocentres along the rift margins
Ben, messaoud Yethreb. "Modélisation analytique du couplage multi-physique magnétique-thermique dans la phase de préconception d'un système mécatronique." Thesis, Université Paris-Saclay (ComUE), 2018. http://www.theses.fr/2018SACLC079/document.
Повний текст джерелаDuring the design phase, the different engineering teams make multiple FE simulations dealing with various physical behaviours in order to ensure both verification and validation.However, the unsatisfactory results lead to late changes and hence to long iterations and increasing costs.In order to tackle this problem, it is essential to take into account the geometrical and multi-physical constraints in the complex system architecture since the conceptual design phase.In fact, a process called SAMOS is developed aiming at selecting the most adequate 3D multi-physical architecture while ensuring an efficient collaboration between the engineering teams. Moreover, this framework is based on two SysML extensions which allow the enrichment of the architecture with geometrical and multi-physical data.Furthermore, this thesis focuses on magnetic constraints and magnetic-thermal coupling.Since this phase does not support long FE simulations, the analytical models based on simplified geometries are sufficient to provide satisfactory approximate results.In this context, different analytical models are studied and validated through FE simulations and measures for several cases such as NdFeB permanent magnets. Indeed, the temperature rise does not only decrease the remanent flux density but is able also to cause irreversible losses. In fact, once we go back to the initial temperature, the characteristics of the magnet are modified. The different factors impacting the demagnetization process are discussed.Besides, the temperature impact on brushless motors’ performances is studied since this device represents a complex mechatronic system
Bigot, Dimitri. "Contribution à l'étude du couplage énergétique enveloppe / système dans le cas de parois complexes photovoltaïques (PC - PV)." Phd thesis, Université de la Réunion, 2011. http://tel.archives-ouvertes.fr/tel-00766755.
Повний текст джерелаHuc, Pierre-Emmanuel. "Modélisation probabiliste du couplage d'un champ électromagnétique stochastique sur un équipement électronique dans un système multi-cavités." Toulouse 3, 2004. http://www.theses.fr/2004TOU30164.
Повний текст джерелаBigot, Dimitri. "Contribution à l’étude du couplage énergétique enveloppe / système dans le cas de parois complexes photovoltaïques (PC - PV)." Thesis, La Réunion, 2011. http://www.theses.fr/2011LARE0024/document.
Повний текст джерелаThis thesis presents a thermal and electrical modelling of PV walls integrated to buildings. The particularity of this model is that the heat transfer that occurs through the panel to the building is described so that both building and PV thermal modelling are fully coupled. This has the advantage of allowing the prediction of the impact of PV installation on the building temperature field and also the comfort inside it. The aim of this study is to show the impact of the PV panels in terms of level of insulation or solar protection for the building. Moreover, the study has been conducted in La Reunion Island, where the climate is tropical and humid, with a strong solar radiation. In such conditions, it is important to minimise the thermal load through the roof of the building. The thermal model is integrated in a building simulation code and is able to predict the thermal impact of PV panels installed on buildings in several configurations and also their production of electricity. Finally, the experimental study is used to give elements of validation for the numerical model and a sensitivity analysis has been run to put in evidence the governing parameters. It has been shown that the radiative properties of the PV panel have a great impact on the temperature field of the tested building and the determination of these parameters has to be taken with care. Results of sensitivity analysis are used to optimize the PV thermal model using the GenOpt optimization program
Ho, The Nhan. "Couplage d'algorithmes d'optimisation par un système multi-agents pour l'exploration distribuée de simulateurs complexes : application à l'épidémiologie." Thesis, Paris 6, 2016. http://www.theses.fr/2016PA066547/document.
Повний текст джерелаStudy of complex systems such as environmental or urban systems, often requires the use of simulators for understanding the dynamics observed or getting a prospective vision of the evolution of system. However, the credit given to results of a simulation depends heavily on the trust placed in the simulator, and the quality of validation. This trust is achieved only through an advanced study on the model, a sensitivity analysis of parameters and a comparison of simulation results and collected data. For all of those, plethora of simulations is necessary, which is costly in term of computing resources (CPU time, memory and processors) and is often impossible because of the size of parameters space. It is therefore important to reduce significantly and intelligently the domain to explore. One of the special properties of representative simulators of real phenomena is that they own a parameters space, of which the nature and the form is based on: (i) the scientific objectives; (ii) the nature of manipulated parameters; and (iii) especially complex systems. Thus, the choice of an exploration strategy is totally dependent on the domain to explore. The generic algorithms in the literature are then not optimal. Because of the singularity of complex simulators, the necessities and the difficulties of exploring their parameters space, we plan to guide the exploration task of complex systems by providing GRADEA, a stratified cooperative exploration protocol, that hybrids three different algorithms of different categories in the same environment: the screening search for areas of interest, the global search and the local search. Various exploration algorithms will explore the search space by parallel manner to find the global optimum of optimization problem and also to partially describe the cartography of solutions space to understand the emergent behavior of the model. The first results of the stratified exploration protocol with an example of preselected search algorithms are applied to the environmental simulator for the design of vaccination policies of measles disease in Vietnam. The coupling of search algorithms is built on a modular and agent based architecture that interacts with a computing cluster where the simulations run. This environment facilitates both the interaction between a group of search algorithms, and also the use of high performance computing resources. The challenge is resolved to propose to community, an optimized environment where users will be able: (i) to combine search algorithms that adapted to case study; (ii) and take advantage of the available resources of high performance computing to accelerate the exploration
Auvray, Roman. "Hydrodynamique et acoustique des instruments de la famille des flûtes : influence du système d’alimentation sur la production du son." Paris 6, 2013. http://www.theses.fr/2013PA066548.
Повний текст джерелаThe current status of research in musical acoustics, particularly on flute-like instruments, has reached a point that now allows to include the musician within the study of the instrument. The interaction of the musician with his instrument is described using control parameters that shape the sound while transposing the musical intent of the instrumentalist. Among these parameters, the supply pressure gets a key role since it allows a direct control of the dynamics of the sound. This thesis focuses on the study of this parameter and the consequences of its control on the sound production. The different time scales on which the supply pressure is likely to evolve have naturally divided the study into two parts. On one hand, the effects associated with slow pressure variations (changes in the fundamental frequency of oscillation, stability of the different oscillating regimes, changes in the spectral content) have been validated by the results produced by two models of sound production. These results, whose resolution comes from numeric tools, have been validated by experimental observations. On the other hand, rapid variations of the supply pressure have been identified as being partly due to the acoustic coupling between the upstream system and the instrument. Experimental observations have highlighted the controllability of acoustic coupling by the player. Besides, a proposal of modification of the two models of sound production provides qualitatively satisfactory results that allows to identify the important elements of the acoustic coupling control
Kaplan, Julia. "Modélisation tridimensionnelle du comportement directionnel du système de forage rotary." Paris, ENMP, 2003. http://www.theses.fr/2003ENMP1279.
Повний текст джерелаDebaillon, Pierre. "Système de modélisation de l'enfoncement dynamique des bateaux." Compiègne, 2005. http://www.theses.fr/2005COMP1566.
Повний текст джерелаThe aim of the thesis is to present a tool to be able to calculate ship squat. It consists of an association of three numerical models in finite elements, reproducing the process of the phenomenon. A first model calculates the pressure field, function of the ship speed. Then a second model, with this pressure field, moves the vessel following a force and momentum result. The last model updates the mesh for a new cycle. The system is running as long as the equilibrium model moves the vessel
Douani, Mustapha. "Contribution à l'étude du couplage séchoir-pompe à chaleur à absorption fonctionnant avec le système eau-triethylène glycol." Toulouse, INPT, 1989. http://www.theses.fr/1989INPT011G.
Повний текст джерелаLiu, Qiusheng. "Couplage entre forces interfaçiales dans un système multicouche de fluides immiscibles, avec ou sans effet des forces thermogravitionnelles." Aix-Marseille 2, 1994. http://www.theses.fr/1994AIX22065.
Повний текст джерелаSouley, Madougou Abdoul Majid. "Contribution à l'étude et à la commande d'un système de chauffage par induction polyphasé." Phd thesis, Toulouse, INPT, 2011. http://oatao.univ-toulouse.fr/18601/1/souley_madougou_partie_1_sur_2_2.pdf.
Повний текст джерелаDugué, Guillaume. "Etude fonctionnelle d'un interneurone inhibiteur du cortex cérébelleux : la cellule de Golgi." Paris 6, 2006. http://www.theses.fr/2006PA066256.
Повний текст джерелаDjennaoui, Mohand-Said. "Structuration des données dans le cadre d'un système de gestion de bases de connaissances." Lyon, INSA, 1992. http://www.theses.fr/1992ISAL0077.
Повний текст джерелаBoth the deduction and the structuration of the information are essential features for the new generation of DBMS (namely Knowledge Base management System : KBMS). EPSILON is KBMS integration (combining) logic programming (PROLOG) and relational databases ; It allows to use data stored in the data bases as prolog's facts and with user transparency. This work descibes the system's enriching by endowing it with structuration mechanisms in the sens of NF2 relations (Nested relations). The user can define external views based on a NF2 model. At the internal level, the relations remain compatible with the traditional relational model. Around the EPSILON kermel, we have designed and developed: - A meta-interpreter of logic based language including sets and tuples constructors. - A translater which allows to use the met-interpreter in a transparency way. - A meta-interpreter which allows to handle SQL request relation
Aghavnian, Thomas. "Couplages magnéto-électriques dans le système multiferroïque artificiel : BaTiO₃ / CoFe₂O₄." Thesis, Université Paris-Saclay (ComUE), 2016. http://www.theses.fr/2016SACLS310/document.
Повний текст джерелаMagnetoelectric multiferroics are of particular interest in the field of spintronics, especially for the possible control of the magnetization using an electric field. The lack of intrinsic multiferroics can be circumvented by using artificial multiferroics, made with individual ferroelectric and magnetic phases. Although they may exhibit higher coupling values, the precise coupling mechanisms involved are still not well understood. Getting insights in the understanding of these phenomena requires studying well mastered and crystallized samples. The combination of BaTiO₃ thin films (3 to 20nm), the prototypical ferroelectric, and of CoFe₂O₄ ones, a highly magnetostrictive ferromagnet with a high Curie temperature, constitutes a suitable model system well suited for such a study. In this thesis, we realized CoFe₂O₄ / BaTiO₃ thin films of high crystalline quality by oxygen plasma assisted molecular beam epitaxy on a SrTiO₃ (001) substrates. First, we study independently for each phase the individual properties of chemistry, structure, magnetism and ferroelectricity, using in particular a range of synchrotron techniques. Based on those fundamental results, we set up direct and indirect magnetoelectric coupling experiments, where we apply an electric polarization to measure a change in magnetization, and vice versa. We manage to observe the magnetoelectric coupling, mainly through the strong interaction of the CoFe₂O₄ and BaTiO₃ films. The indirect mechanisms dominate however and involve structural as well as chemical modifications through ion displacement. Those ion displacements create reversible changes in resistance at room temperature. These results imply that, in addition to the evidenced multiferroic properties, the system makes also promise for resistive RAM devices applications
Tekobon, Jerry. "Système multi physique de simulation pour l'étude de la production de l'énergie basée sur le couplage éolien offshore-hydrolien." Thesis, Le Havre, 2016. http://www.theses.fr/2016LEHA0031/document.
Повний текст джерелаThe thesis work concerns the development of a real-time emulation platform for theoretical and experimental studies of offshore wind and tidal power hybrid systems. Various energy coupling architectures are processed on the basis of the functional similarities of two systems and by both numerical and experimental emulation concepts. The notion of accelerated time used for real time simulation has been developed. The concept was validated on the experimental platform using the evolution of the mean power delivered by a small wind turbine. This approach can reduce the observation times of the measurement campaigns and could accelerate the studies for the wind potential of developing sites. We have also developed two types of coupling of the wind-tidal hybrid system. An electrical coupling based on the connection in parallel on a continuous bus of two turbines. We have developed an innovative concept of an electromechanical coupling based on the use of a single asynchronous generator on which the wind turbine and tidal turbine are simultaneously coupled. For this purpose, a vector-controlled servomotor was used to emulate the wind turbine while a synchronous motor was used as a tidal turbine emulator. The generator shaft is used as a mechanical coupling between the two systems. We have demonstrated in the experiments that we have developed the complementarity of the electrical productions of the two systems; we highlighted the need to add a storage system to compensate the simultaneous decrease of the two energy productions. The real time simulations results allow us to validate the feasibility of such a coupling
Roux, Benjamin. "Couplage entre simulation système et simulation aux grandes échelles pour la simulation multi-échelles de moteurs à combustion interne." Thesis, Paris 6, 2015. http://www.theses.fr/2015PA066633/document.
Повний текст джерелаThe decrease of greenhouse gases and pollutant emissions (nitrous oxides, carbon oxides, particles...) for spark ignited engines goes through the development of new technologies such as direct injection, turbocharging, downsizing, etc. However, the benefits of these technologies, which complexify the engines, are limited by the phenomena they intensify such as Cyclic Combustion Variability (CCV) and abnormal combustions. A thorough understanding of these phenomena is a cornerstone for the improvement of future engines. The aim of this work is to predict acyclic and transient phenomena in increasingly complex engines through the development, the validation and the use of a coupling method between Large-Eddy Simulation (LES) and system simulation. This thesis has demonstrated that simulating a complete industrial engine in 3D with LES to study its transient behavior is possible. The methodology developed in the present work was used to study the engine of the national research agency project SGEmac and a good agreement was obtained between the experiments and the tridimensional simulations. These results are the last validation step of the coupling method and demonstrate the capacity of the coupled solver to simulate the whole engine. The coupling method is then applied to study engine load and regime transients for the national research agency project ASTRIDE. The comparison between simulations and experiments show that the coupled solver can simulate CCV and transients, thus fulfilling its initial goal
De, Benedictis Massimiliano. "Instabilités couplées à haute fréquence dans les moteurs - fusées à ergols liquides : étude du couplage chambre de combustion - système d'alimentation." Phd thesis, Université de Poitiers, 2007. http://tel.archives-ouvertes.fr/tel-00283229.
Повний текст джерелаPellerin, Denis. "Etude et réalisation d'un système de transmission d'informations dans les bâtiments par couplage électromagnétique sur les réseaux de canalisations métalliques." Lyon, INSA, 1988. http://www.theses.fr/1988ISAL0051.
Повний текст джерелаLegoll, Frédéric. "Méthodes moléculaires et multi-échelles pour la simulation numérique des matériaux." Paris 6, 2004. http://www.theses.fr/2004PA066203.
Повний текст джерелаDoli, Valentin. "Phénomènes de propagation de champignons parasites de plantes par couplage de diffusion spatiale et de reproduction sexuée." Thesis, Rennes 1, 2017. http://www.theses.fr/2017REN1S139/document.
Повний текст джерелаWe consider organisms that mix sexual and asexual reproduction, in a situation where sexual reproduction involves both spatial dispersion and mate finding limitation. We propose a model that involves two coupled equations, the first one being an ordinary differential equation of logistic type, the second one being a reaction diffusion equation. According to realistic values of the various coefficients, the second equation turns out to involve a fast time scale, while the first one involves a separated slow time scale. First we show existence and uniqueness of solutions to the original system. Second, in the limit where the fast time scale is considered infinitely fast, we show the convergence towards a reduced quasi steady state dynamics, whose correctors can be computed at any order. Third, using monotonicity properties of our cooperative system, we show the existence of traveling wave solutions in a particular region of the parameter space (monostable case)
Kazzoul, Abderrahman. "Réalisation d'un système d'analyse de formes par vision active appliqué au contrôle d'objets à symétrie de révolution." Nancy 1, 1990. http://www.theses.fr/1990NAN10124.
Повний текст джерелаAboab, Bettina. "Etude du couplage vibronique dans le cas d'un système XY3Z de symétrie C3V soumis à effet Jahn-Teller : application au calcul du couplage vibronique dans l'état excite 3E du radical methyl-nitrène CH3N." Pau, 1992. http://www.theses.fr/1992PAUU3019.
Повний текст джерелаPerret, Laurent. "Etude du couplage instationnaire calculs-expériences en écoulements turbulents." Phd thesis, Université de Poitiers, 2004. http://tel.archives-ouvertes.fr/tel-00011370.
Повний текст джерелаMuzard, Philippe. "Etude du comportement dynamique linéaire et non-linéaire d'un rotor d'hélicoptère : Application au couplage rotor-fuselage." Ecully, Ecole centrale de Lyon, 1994. http://bibli.ec-lyon.fr/exl-doc/TH_T1582_pmuzard.pdf.
Повний текст джерелаThe development of computing power and optimisation methods used by the engineers leads to a better design of structures. It has for first consequence the appearance of non linear phenomena affecting the dynamic behaviour which can modify in a large part the linear response. The first part of this work deals also with the insertion of non linearities in the modelling of helicopter rotor dynamics. We will show that non linearities can't be always neglected and leads sometimes to chaotic behaviour and even instability. A particular analysis of these phenomena is made using well-known methods - Volterra's series, normal form theory - in order to identify the main non linear parameters. The original aspect of this work lies in the application of non linear analysis to a multi-dimensional system which is close to reality. We will study afterwards the coupling between two linear structures. In the case of helicopter, the particularity is that the rotor is strongly gyroscopic. We will use a modal approach of the fuselage to simplify the analysis. Two directions will be explored. A simplified model permits us to identify the coupled degrees of freedom. A second modelling, taking into account numerous aerodynamic effects, will be used as a tool for conception and design of helicopters. At last, we will study an unstable coupling between rotor and fuselage through particular mechanical organs
Xuárez, Marill Lisbet. "Synthèse par ortho-métallation et couplage pallado-catalysés de nouveaux dérivés de bêta-carbolines actifs au niveau du système nerveux central." Paris 11, 2006. http://www.theses.fr/2006PA112189.
Повний текст джерелаThe aim of this thesis is the synthesis of new derivatives of β-carbolines interacting with the Central Nervous System (CNS) especially at the level of the GABAA receptor. In the first chapter, a new process for the synthesis of a β-carboline-3,4- γ-lactone, (R, S)-10-hydroxymethylbutanolide[3,4-c]-β-carboline using the technique of ortho-directed metallation, allows its preparation in a few steps and in a reproducible fashion. This result confirms the value of the ortho-metallation reaction for the introduction of substituants at the C-4 position of 3-carboxy-β-carbolines. In the second chapter, starting from the 4-iodo-β-carboline-3-carboxamide derivative prepared by ortho-metallation, the Suzuki coupling reaction was used to prepare a series of 4-aryl-β-carbolines-3-carboxamides, some of which were shown to bind to the GABAA receptor. In the third chapter, intramolecular cyclization by CH-ortho activation catalysed by palladium allowed the
Chatty, Abdelhak. "Apport du couplage entre dynamique d’apprentissage et propriétés collectives dans l’optimisation multi-contraintes par un système multi-agents et multi-robots." Thesis, Cergy-Pontoise, 2014. http://www.theses.fr/2014CERG0709.
Повний текст джерелаIn this work, we propose a self-organized system composed by agents-robots, controlled by a subsumption architecture with probabilistic local rules of deposits and taking. These agents-robots are able, thanks to the development of their cognitive abilities to create a cognitive map, to learn various goals' locations and to plan the return to these goals. Although formally the algorithm does not allow each agent to « mix or merge or optimize » several objectives, we show that the overall system is able to perform a multi-objective optimization. Specifically, the fusion of local learning with the accumulation of the individual decisions allows to emerge (i) structures in the environment and (ii) several dynamics such as specialization behavior or those that we can consider as « selfish » or « altruistic ». We show that the imitation strategy contributes to the improvement of the performance of our SMAC and our SMRC, namely the optimization of time to explore the various resources, the average planning time, the overall satisfaction level of agents and finally the the average time of convergence to a stable solution. Specifically, the addition of an imitation ability improves the construction of cognitive maps for each agent and stimulates the implicit sharing of informations in an unknown environment. Indeed, individual discoveries can affect the social level and therefore include learning new behaviors at the individual level. Finally, we compare the emergent properties of our SMAC with a mathematical model based on linear programming (LP). This evaluation shows the good performance of our SMAC which allows to obtain solutions close to the solution of the PL for a low cost of computation. In a final series of experiments, we study our aggregation system in a real environment. We set up a SMRC, composed by robots that are able to perform taking operations, deposits operations and refueling operations. We show through the first tests of aggregation that the results are promising
Vigneau, Guillaume. "Etude et modélisation d’un système de transmission d’énergie et de données par couplage inductif pour des systèmes électroniques dans l’environnement automobile." Thesis, Toulouse 3, 2016. http://www.theses.fr/2016TOU30281.
Повний текст джерелаNowadays there is a strong demand of systems allowing to transfer energy in a wirelessly way to small electronic devices. So we can well understand the interest of such systems in embedded environments such as vehicle cockpit. The principle of magnetic induction comes from a magnetic flux exchange between two inductive antennas. The magnetic field will be used to transport an electrical power from an emitter to a receiver. These systems using the magnetic induction to transfer energy contain an emitter, inductive antennas (coils) and a receiver. A first chapter will be dedicated to the antennas employed in inductive wireless power transfer systems on theoretical and technological points of views. An electromagnetic modeling of these inductive antennas will be realized and validated through correlation with measurements. Once the modeling process defined and the validations done, it will be used through intensive electromagnetic simulations in order to show the impact of antennas parameters on their electrical and electromagnetic performances. After the inductive antennas characterization and their key parameters identification done, we will study in a second time the magnetic induction effects when emission and reception antennas are placed together in order to realize an inductive power transfer. Notions of magnetic coupling which appears between inductive antennas and magnetic efficiency which characterizes how much quantities of power are transferred will be highlighted. In the same conditions as before, the impact of antennas parameters on the power transfer and magnetic coupling will be investigated through electromagnetic modeling of inductive antennas and the use of intensive electromagnetic simulations. Thus, we will have the opportunity to precisely understand the meaning of the inductive power transfer and the different ways of optimizations. By this way, we will also propose some general design guidelines for antennas employed in inductive wireless power transfer systems. A third chapter will be dedicated to the presentation of the different electronic stages used in inductive wireless power transfer systems. A part of it will be employed on the definitions of the different elements allowing the wireless power transfer on a system approach. The design, optimization and measurement of power amplifiers used on the emission stage will be presented too.. Indeed, it is necessary to have efficient power amplification in order to transfer the required power to different receivers such as phones at the same time to limit the power losses. From circuit modeling of different emitter and receiver and with circuit simulations, we will develop power budgets in order to evaluate the performances and limits of these systems. Once the simulation validated by measurement, we will be able to quantify the total power transfer efficiency and propose optimization ways. Because of the current existence of different inductive wireless power standards on the industrial market for electronic consumer, analogies with them will be done all along the different steps of this thesis in order to highlighted their different functioning principles
Nguyen, Van-Linh. "Couplage des systèmes photovoltaïques et des véhicules électriques au réseau : problèmes et solutions." Thesis, Grenoble, 2014. http://www.theses.fr/2014GRENT056/document.
Повний текст джерелаThe connection of PV systems or EV charging systems may impact on the operation of the electrical network:• Voltage variation• Voltage unbalance between phases• Impact of the intermittent nature of the solar resource• Impact of the random nature of EV charging systems• Harmonic injection in the network• DC injection network• Leakage currents• Impact on loss• Impact on congestion in case of EV charging ...Therefore, the objective of this thesis is to develop strategies to control / intelligent controls for PV inverters and charging systems for EVs to- Reduce the total cost of the PV system or charging system,- Increase the performance of PV inverters connected to the network- Increase the penetration of PV or EV charging- Ensure continuity of service- Participate in the regulation of grid voltage and grid frequency- Contribute to stabilize the grid- Improving the quality of energy- Avoid congestions...As part of the work, the definition of services provided by PV systems or EV charging systems is required. These services PV systems or systems that can provide to the network, are developed in a prospective: regulation of the voltage plan, absorption / reactive power as needed, withstand voltage dips, improving quality. Studies concerned:- Study of interactions (impacts) between PV inverters and network- Study of interactions (impacts) between the inverters and EV charging network- Definition of the services provided by these systems- Development and modeling of a bidirectional inverter- Development of control systems / intelligent control for these services: Voltatge controlo Management of congestiono Improved quality (eg harmonics). Ability to ride-through voltage dips
Labeau, Yannis. "Couplage de la modélisation géologique 3D et de la modélisation hydro-thermique : apport à la compréhension du système géothermique du Lamentin (Martinique)." Thesis, Antilles, 2018. http://www.theses.fr/2018ANTI0375.
Повний текст джерелаGeothermal energy has become one of the recognized processes to supply energy and to stop significantly the emission of greenhouse effect gases in the atmosphere. This classical renewable energy consists to extract thermal energy into the Earth and to produce heat, cooling and/or electricity. But particularly for the last case, only a few places in the world can exploit it. Indeed, the geothermal reservoir must be permeable and easily accessible.The subduction setting of the Lesser Antilles is favorable to the presence of geothermal reservoirs but its insularity and its volcanic nature have a negative impact on the exploration phases. The influence of the sea on electromagnetic methods, dense bush and the strong urban development add other obstacles. Thus, the risk of failure increases. Consequently, the localization and the characterization of the geothermal reservoir must be more precise. Facing these many constraints, it is essential to apply adapted methodologies and to build the best conceptual model as possible.The coupling of numerical models is presented and applied to the low enthalpy geothermal system of Lamentin, in Martinique. This approach could be developed for other countries with the same geodynamical context. The Geomodeller software and the ComPASS Code are the two numerical tools which have been employed to generate a 3D geological model then to simulate the hydrothermal aspect.The building of the 3D model gives elements of knowledge and thinking about the geothermal system of Lamentin and the hydrothermal simulations suggest some hypothesis on the localization and the intensity of the heat source
Garnier, Vincent. "Le couplage du récepteur bêta-adrénergique à la protéine Gs dans l'encéphale de rat : mise en évidence d'une modulation physiologique." Paris 11, 1999. http://www.theses.fr/1999PA11T014.
Повний текст джерелаThe P-adrenoceptors (βAR) of the central nervous system are relatively less studied than those of the periphery. This work ai ms at characterising the coupling of central βAR with G8 proteins and adenylyl cyclase, to eventually show differences with those of peripheral organs. In the presence of an agonist, βAR display two different states, named low- and highaffinity states. The latter state is responsible for the signal transmission, and it was confirmed by measuring the formation of cAMP in slices of rat cortex and cerebellum which βAR were stimulated. The high-affinity state is due to the direct binding of the G8 protein to the βAR. In the periphery, an excess of GTP or of an analog - like 5'-guanylylimidodiphosphate (GppNHp) -induces the separation of G8 proteins from the receptors ; the latters are then ali in the lowaffinity state. However, this conversion was only partial in the cortex and cerebellum synaptosomes, whereas it was total in rat cultured astrocytes. The G8 proteins activities in the basal state as weil as in the activated state were at least twice higher in cultured astrocytes as compared with those of synaptosomes. Subsequently to a mild detergent treatment followed by the extraction of the detergent soluble part, receptors in the high-affinity state - which proportions were clearly increased - became totally sensitive to the excess of GppNHp, and Gs proteins activities were doubled. In contrast, this treatment had no significant effect on cultured astrocytes. In reconstitution experiments with detergent - treated membranes, the detergent - soluble part allowed in a dose dependant manner the restoration - or even the induction in the case of cultured astrocytes - of the GppNHp-insensitivit y to the totality of βAR in the high-affinity state. Taken together, these results suggest the presence of a GppNHp-insensitivity factor in the rat central nervous system, able to bind to G8 proteins. This probably proteic factor could be a transmission regulator, not only for the P-adrenergic signal, but also for other receptor-G protein couples
Stelletta, Julien. "Modélisation volumique déformable du système musculosquelettique du membre inférieur." Thesis, Lyon 1, 2015. http://www.theses.fr/2015LYO10107/document.
Повний текст джерелаMusculo-skeletal modeling can update our knowledge concerning the biomechanical behavior of the osteoarticular and musculotendinous structures. This research work is focus on the development of methodology and tools for the generation of a personalized model of the lower limb musculoskeletal system, taking account of the deformable and contractile behavior of the muscles. This workflow automatically builds the model dataset (from medical imagery), performs the simulations (coupled with a multibody dynamic model), and offers specific analysis tools (as local stiffness mapping in the active muscle) required for various orthopedic studies
Mapagha, Saül. "Qualification de la prédiction du comportement vibratoire d'un sous-système sur véhicule." Phd thesis, INSA de Rouen, 2010. http://tel.archives-ouvertes.fr/tel-00557906.
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