Дисертації з теми "Transferts de charge et de la SEI"
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Roustan, Hervé. "Modélisation des transferts couples de charge et de chaleur dans un électrolyseur industriel de production de fluor." Grenoble INPG, 1998. http://www.theses.fr/1998INPG0079.
Повний текст джерелаDellali, Emna. "Étude théorique et expérimentale des écoulements oscillants alternés d’un gaz au sein de micro et milli-régénérateurs de moteur Stirling." Thesis, Bourgogne Franche-Comté, 2018. http://www.theses.fr/2018UBFCD023.
Повний текст джерелаThe present work presents a thermofluidic study of a Stirling engine regenerator both at the micro and millimeter scales within the framework of the MISTIC (Micro Stirling Clusters) project financed by the ANR. The studied thermal regenerator allows to limit external energy supply to the system by recycling the heat rejected during the thermodynamic cycle. It is composed of a staggered-pillars matrix crossed by an oscillatory gas flow. The design of the miniature structures of the regenerator was conditioned by the chosen manufacturing process. The micro-regenerator design was conditioned by the chosen manufacturing process. The investigated porosities vary between ε = 0.8 and 0.9 for a shape factor equal to F.F = 0.3. The numerical simulations and experimental results for both prototype scales highlight the effects of the porosity, the piston stroke, the gas flow frequencies and the thermal gradient on the regenerator thermofluidic performances. Besides, correlations of the pressure loss coefficient were established and confronted with those available in the literature. We also calculated the pumping power required during a thermal cycle which depends on the porosity, the piston stroke as well as the gas flow frequency. The calculation of thermal efficiencies of the regenerator was led on both phases of heat store and heat refund. We established a decrease of the thermal efficiency according to the number of Reynolds, no concluding results were obtained for the effect of the porosity. A rough estimation of the figure of merit showed an increase of the pressure drop to thermal heat loss ratio according to an increasing Reynolds number of the gas flow
Rabab, Houssam. "Modeling of sodium-ion batteries for on-board diagnosis of their states of charge and health." Electronic Thesis or Diss., Compiègne, 2024. http://www.theses.fr/2024COMP2809.
Повний текст джерелаThe thesis presents a physics-based model for sodium-ion cells of the NVPF/HC type. The model takes into account the complexities involved in modeling these cells, notably due to their nonlinearities in current, temperature and state of charge (SoC). The model structure is an equivalent circuit enhanced by concepts used in single particle models (SPM) to form an ECM-SPe structure, suitable for diagnosis of the SoC and the state nof health (SoH) of the cell. The ECM-SPe structure separates the effects of solid-phase and liquid-phase diffusion. It is shown that classical modeling of solid-phase diffusion effects by impedance leads to numerous difficulties. As a replacement, an innovative approach is proposed using shifts in SoC of the open circuit voltage (OCV). These shifts are directly related to electrochemical phenomena, enabling the implementation of physical nonlinearity models. The ECM-SPe structure characterizes various electrochemical phenomena as voltage contributions: ohmic or static overvoltage (Vs), surface overvoltage (Vsurf) which includes charge transfers and the solid electrolyte interphase (SEI) overvoltages, liquid phase diffusion overvoltage (Vld) and the surface equilibrium voltage (SEV). Analytical models for current, temperature and SoC nonlinearities are proposed for each voltage contribution. These nonlinearity models are based on physical and empirical equations to characterize the model parameters without the use of lookup tables. The NVPF/HC model consists of the ECM-SPe structure with the nonlinearity models for the voltage contributions. The PhD details experimental protocols for parameter determination, which include constant current tests, pulse tests, and impedance spectroscopies, performed under various currents, temperatures and SoC. The performance of the model is validated by comparisons with experimental data, demonstrating promising results. In addition, the NVPF/HC model can be used as a diagnostic tool for charge transfers and SEI by separating their nonlinearities in current, temperature and SoC. The NVPF/HC model shows its reliability for estimating the cell voltage in variablecurrent applications, with good performance at currents up to ±5C and temperatures above 5 ◦C. The study also highlights the need to develop distinct characterization tests for solid and liquid diffusion contributions
Albrecht, Antoine. "Étude numérique des transferts dynamiques et thermiques au sein d'un mélange turbulent gaz-goutte-particule : application à la zone d'injection de charge d'un réacteur à lit fluidisé de FCC." Toulouse, INPT, 2001. http://www.theses.fr/2001INPT026H.
Повний текст джерелаWhitbeck, John. "Réseaux mobiles opportunistes : visualisation, modélisation et application aux transferts de charge." Paris 6, 2012. http://www.theses.fr/2012PA066304.
Повний текст джерелаWireless communicating devices are everywhere and increasingly blend into our everyday lives, they form new opportunistic networks that allow data to flow across often unreliable, unorganized, and heterogeneous wireless networks. By developing new analysis techniques for temporal dynamic graphs, this thesis proposes and implements a strong use-case for opportunistic networks: data offloading. Analyzing real-life connectivity graphs is difficult. In this thesis, we develop the plausible mobility approach, which infers, from a given contact trace, a compatible node mobility. Furthermore, we define reachability graphs that capture space-time connectivity. When applied to common contact traces, they show that acceptable delivery ratios for point-to-point communications are often out of reach, regardless of the DTN routing protocol, but that the size of the space-time dominating set tends to be a small fraction of the total number of nodes. Accordingly, we show how opportunistic networks may be used to significantly offload broadcast traffic in situations were two radio technologies coexist, typically a pervasive, low-bitrate, and expensive radio, alongside a shorter-range, high-bitrate, and cheaper one. The latter forms the opportunistic network that is used for disseminating most of the content, whereas the former serves both as a control channel for monitoring and as a data channel for bridging the connectivity gaps in the opportunistic network. In this thesis we propose Push-and-Track, a mobility-agnostic framework that leverages an opportunistic network to reliably disseminate content to large numbers of mobile nodes, while minimizing the load on the pervasive radio
Goudy, Violaine. "Synthèse, caractérisation et réactivité de composés polymétalliques pour la photochimie et les transferts de charge." Thesis, Montpellier, Ecole nationale supérieure de chimie, 2015. http://www.theses.fr/2015ENCM0016/document.
Повний текст джерелаThis work falls within the global project of the light energy conversion and storage. These systems require the association of several molecular constituents as a photosensitizer coupled to a catalyst. In order to improve the fundamental understanding on photo-induced charge transfer, the photo-physical behavior of molecular species was compared to their coordination polymers analogs. The first step of this work was to develop a synthetic pathway leading to bimetallic molecular species through an organic bridging ligand and to their coordination polymers analogs. The electro-chemical and photo-chemical studies of molecular species incorporating one or two photosensitizing units highlight the essential parameters for a photo-induced charge transfer. The effect of the nature and structure of the complexes and the ligands (ancillary ligands and bridging ligands) on physico-chemical properties was studied. Complexation of cobalt induces a significant drop of the excited state lifetime assigned to an electronic communication between the two metallic centers. Incorporation of electro-donating substituents on the ancillary ligands linked to the photosensitizer unit leads to a better electron transfer to the second metal center. Then the study was focussed on the coordination polymer (PC) analogs. Two kinds of PC were synthesized, a first one incorporating only photosensitizing units as nodes, the catalyst being coordinated to the organic ligand, a second one with photosensitizing and catalytic units as nodes. These amorphous materials were synthesized and their photo-physical properties were studied. Finally the first attempts for the photo reduction of CO2and protons were realized on molecular species and coordination polymers
Verbanck, Michel. "Transferts de la charge particulaire dans l'égout principal de la ville de Bruxelles." Doctoral thesis, Universite Libre de Bruxelles, 1995. http://hdl.handle.net/2013/ULB-DIPOT:oai:dipot.ulb.ac.be:2013/212578.
Повний текст джерелаMermond, Yannick. "Transferts de chaleur dans un mélange constitué de fluide frigorigène et d'huile." Nancy 1, 1999. http://www.theses.fr/1999NAN10287.
Повний текст джерелаThe phase out of chlorine containing refrigerants (CFC and HCFC) has led to the introduction of new refrigerants and lubricants to the market. The interest in using HFC fluids as working fluids in heat pumps and refrigerating systems has increased during the last decade due to their ability to replace fluids harmful to the stratospheric ozone layer. The study presents the influence of synthetic oil (POE ISO 68) on flow boiling of refrigerants R134a (pure fluid) and R410A (R32/R125 50%/50%). Local and average heat transfer coefficients and pressure drops have been measured for a smooth horizontal tube. The distribution of the heat transfer coefficient at the inner walI has been obtained from solving the inverse heat conduction problem (IHCP) and resulted in a local combination of nucleate and convective contributions to flow boiling. Local heat transfer coefficients have been averaged and displayed as a function of the vapour quality. For R134a: small amounts of oil (1 % to 6% in the liquid phase) increased the heat transfer coefficient at low and intermediate vapour qualities (Iess than 0. 60) compared to pure fluid. However a hugh reduction of the heat transfer has been observed at higher vapour qualities. For R410A: oil dramatically decreases the heat transfer coefficient compared to pure fluid. Pressure drops are also affected by small amounts of lubricant: an important increase has been noted for both fluids. Available design methods for flow boiling heat transfer coefficient (superposition, enhancement, asymptotic) badly predict the experimental results. Nevertheless a new design method accounting for flow patterns has shown good agreements. The influence of the lubricant on the heat transfer is discussed and a new proposition is made to calculate pressure drops
Delacôte, Cyril Walcarius Alain. "Etudes électroanalytiques de processus de transfert de matière et de charge au sein de silices." [S.l.] : [s.n.], 2005. http://www.scd.uhp-nancy.fr/docnum/SCD_T_2005_0147_DELACOTE.pdf.
Повний текст джерелаBerny, Stéphane. "Transferts de charges assistés par les dithiopyrannylidènes dans les cellules solaires organiques et les hétérostructures magnétiques." Paris 6, 2010. http://www.theses.fr/2010PA066367.
Повний текст джерелаOlive, Alexandre. "Transferts d’énergie, de charge et d’information optique dans des matériaux nano-structurés, conception et spectroscopie à l’échelle moléculaire." Thesis, Bordeaux 1, 2008. http://www.theses.fr/2008BOR13691.
Повний текст джерела2,3-dialkoxy-acenes can self-assemble in solution, with a remarkable packing, leading to the formation nanofibers. The molecular interaction inside the nano-fiber and the relative orientation of the molecules, promote energy transport after light exposure. The energy transfer mechanisms have been elucidated incorporating energy acceptor which can allow to probe excited states inside the host matrix, extracting the energy. Fluorescence confocal microscopy (spectral, dynamic, under polarized light) has been used to characterize the photo-physic properties of these nanofibers. The nanostructure morphologies have also been determined by AFM measurements. Spectroscopic data obtained on 2,3-dialkoxy-acenes crystal , have allow us to refine the data obtained on the fibers, and to study nano-confinement effect on the dynamic of the excited state
Sai͏̈ssac, Marie-Paule, and Serge Chauzy. "Etude expérimentale et numérique des transferts lents de charges électriques entre le sol et le nuage d'orage." Toulouse 3, 1995. http://www.theses.fr/1995TOU30129.
Повний текст джерелаTang, Yong Qiu. "Etude spectroscopique des transferts thermiques et du transfert de charge dans un plasmà haute fréquence analytique." Lyon, INSA, 1986. http://www.theses.fr/1986ISAL0024.
Повний текст джерелаThere are several mechanisms of energy transfer between the annular plasma and the sample injected along the axis of an ICP. The aim of the thesis is at understanding some of them. In the process of evaporation and dissociation, water in the sample consumes an amount of energy, but on the other hand, yields hydrogen which improves the thermal transfer process between the annular plasma and the central channel. This is confirmed by the facts that desolvation decreases the axial excitation temperature but an addition of hydrogen in the central channel produces a significant increase. In the process of ionization-excitation, the charge-transfer from argon ions to the analyte atoms may be important if the total ionization-excitation energy of an ionic line is about 16 eV. The behaviour of an ionic line of magnesium favours this mechanism. An important deviation from ETL results, which is modified by the presence of hydrogen and of an alkaline element matrix. Interferences of easily ionized elements such as sodium and potassium are related to non-thermal mechanisms. They could be reduced by a convenient selection of operating parameters such as flow and linear velocity of the injection gas and observation height
Tang, Yong Qiu. "Etude spectroscopique des transferts thermiques et du transfert de charge dans un plasma haute fréquence analytique." Grenoble 2 : ANRT, 1986. http://catalogue.bnf.fr/ark:/12148/cb376014430.
Повний текст джерелаRimboud, Mickaël. "Étude de l’influence des électrolytes sur les transferts d’ions et examen du transfert d’électron aux microinterfaces eau-nitrobenzène et eau-dichlorohexane." Brest, 2009. http://www.theses.fr/2009BRES2005.
Повний текст джерелаIn the first part of this work, the transfer of various picrates has been studied, from water to three solvents of different permittivities : nitrobenzene (e = 34,8), dichhoroethane (e = 10,45) and dichlorohexane (e = 8. 83). Voltammetry without supporting electrolytes was one of the objectives and this study establishes the influence of the electrolytes in the poorly dissociative media. It is obvious that the thermodynamic scales for the ionic transfers derived from measurements in the presence of electrolytes are conditionals, being influenced by the nature and concentration of the electrolytes. In the second part, the electron transfer across the liquid-liquid interface has been investigated, occurring between a lutetium bisphthalocyanine, Lu[(tBu)4Pc]2, in nitrobenzene or dichlorohexane solutions, and FeIII (CN)6 3-/FeII (CN)6 4- as the redox couple in water. The effect of the ions presents on the interfacial potential and on the electron transfer has been ilIustrated. The proton transfer has been studied across the water-nitrobenzene or water-dichlorohexane interface, assisted by me disproportionation of Lu[(tsu)4Pc]2 in the solvent. This reaction has its origin in the strong basicity of the reduced form of Lu[(tBu)4Pc]2, which facilitates the disproportionation of the lutetium bisphthalocyanine and the proton transfer
Delacôte, Cyril. "Etudes électroanalytiques de processus de transfert de matière et de charge au sein de silices mésoporeuses organiquement modifiées." Nancy 1, 2005. http://docnum.univ-lorraine.fr/public/SCD_T_2005_0147_DELACOTE.pdf.
Повний текст джерелаThe first part of this study deals with the interactions between Hg(II) and mesoporous silicas displaying an organized structure and functionalized by thiol groups. The influence of the structure type (hexagonal or cubic), the way of functionalization (in situ co-condensation or post-synthesis grafting), the functionalization level and the pore size on the sorption capacities and Hg(II) transport rates were examined. The use of various composition media allows the development of some environmental applications, in solid-liquid extraction for instance, or in new amperometric sensors for Hg(II). In a second part, the electrochemical behaviour of mesoporous silicas functionalized by ferrocene groups was studied. The electron transfer reactions inside such systems imply probably a mechanism by electron hopping
Louriou, Clément. "Modélisation instationnaire des transferts de masse et de chaleur au sein des évaporateurs capillaires." Thesis, Toulouse, INPT, 2010. http://www.theses.fr/2010INPT0083/document.
Повний текст джерелаWe study the dynamic of a vapour pocket growing by vaporisation in a porous medium, in relation with the analysis of coupled heat and mass transfers in the porous wick of loop heat pipes (LHP). We propose a model for transient modes, which are still poorly understood in spite of their importance (start-ups, power transitions, etc.). This work is based on a pore network approach enabling us to predict the phase distribution at the pore space scale. In a preliminary step, a study of drainage (displacement of a wetting fluid by a non wetting one) by pressurisation of the invading fluid is performed. This step is necessary for the development and the test of the vapour pocket growing algorithm. A quantitative validation of the hydro-dynamical model is obtained thanks to a dedicated experimental study. The influence of liquid films as well as gas compressibility is investigated. Our model is then improved to deal with heat transfer and phase change. Again, a dedicated experimental study is performed in order to validate the numerical tool. The model is finally improved a last time to deal with the effects due to imbibition mechanisms (displacement of a non wetting fluid by a wetting one). Statistical results concerning the dynamic response of a vapour pocket to the application of a power density are presented, andsome specific oscillating situations in the wick are identified. We finish discussing the influence of the re- etting of the porous wick, a phenomenon which induces a significant hysteresis effect
Desrats, Claire. "Etude expérimentale de l'ébullition d'hydrocarbures dans les échangeurs à plaques et ailettes : analyse des écoulements et des transferts de chaleur par une approche locale." Aix-Marseille 1, 2006. http://www.theses.fr/2006AIX11064.
Повний текст джерелаOur study is dedicated to forced convective boiling of hydrocarbons in brazed aluminium plate fin heat exchangers. This subject was motivated by problems occurring with Core-Kettle boilers which are mainly used in petrochemical industries. Though interesting in energy saving terms, they are over-sized because design laws are not enough accurate and not yet validated for hydrocarbon fluids. A new experimental method has been proposed to improve our understanding of local boiling phenomena in mini-channels. An experimental apparatus with local instrumentation has been designed to measure the whole parameters necessary to a complete analysis of convective boiling. Local measurements of fluid and wall temperatures, absolute pressure, pressure gradient and heat flux are performed on a single control volume. Vapour quality is determined by an enthalpy balance and void fraction by an optical probe whose output signal is treated to identify flow patterns. The performance of 2 geometries, perforated and OSF fins, are compared with propane at 7. 5 and 9. 5 bar and iso-butane at 3 bar, for mass flow rates ranging from 20 to 100 kg/m²/s and mean heat fluxes up to 6 kW/m². 3 different flow regimes are identified: bubbly, plug and slug, annular-like, with transitions for a void fraction of 0. 2 and 0. 74. The effect of the confinement is taken into account in our prediction law for void fraction derived from the drift flux model. The analysis of local friction pressure drops and heat exchange coefficients points out the influence of the major parameters on the convective boiling flow. Friction is well-predicted by a “separated flow” type model and heat transfer by Kandlikar’s correlation
Chevalier, Bastien. "Études expérimentale et numérique des transferts de charge dans les matériaux granulaires. Application au renforcement de sols par inclusions rigides." Phd thesis, Grenoble 1, 2008. http://www.theses.fr/2008GRE10106.
Повний текст джерелаGround reinforcement with rigid piles is a technique of foundation involving a granular fill placed between the work and the supporting soil. Load transfer mechanisms that appear in the granular material allow to increase the effort transmitted to the inclusions located within the improved subsoil and consequently to reduce settlements. The lack of regulation and design methods related to this soil improvement technique led to the set up of a national research project called ASIRi. The essential step for a better understanding of the behaviour of such soil reinforcements is to investigate the complex load transfer mechanisms that take place in the granular material. In order to make light on these mechanisms, an experimental study of the trap-door problem involving granular layer in plain strain conditions were carried out. In a second step, numerical modelling of this solicitation by means of Discrete Element Method is presented. Then, a numerical and parametric study focused on granular fills on rigid vertical piles, based on realistic works layouts, and testing the influence of several technical solution on load transfer mechanisms
Chevalier, Bastien. "Études expérimentale et numérique des transferts de charge dans les matériaux granulaires. Application au renforcement de sols par inclusions rigides." Phd thesis, Grenoble 1, 2008. http://tel.archives-ouvertes.fr/tel-00324361.
Повний текст джерелаLeroy, Stéphanie. "Contrôle cationique des propriétés d'émission de luminescence au sein de dyades pyrène-2,2'-bipyridine : conception, synthèse, études spectroscopiques et théoriques." Bordeaux 1, 2002. http://www.theses.fr/2002BOR12541.
Повний текст джерелаOkyay, Umur Salih. "Etude expérimentale et numérique des transferts de charge dans un massif renforcé par inclusions rigides : application à des cas de chargements statiques et dynamiques." Lyon, INSA, 2010. http://www.theses.fr/2010ISAL0098.
Повний текст джерелаThe soil reinforcement technique with rigid piles is an appropriate solution for most of engineering problems where the soil is compressible. The technique aims to transfer the loads of the structure to soli resistant and less-compressible soil layers. The load transfer is performed with the combination of rigid piles and an earth platform which is interposed between the rigid piles and the structure This earth platform has the advantage of transferring the load to the heads of rigid piles and minimizing the load on the compressible soil layer. Unlike deep foundations of structures, the rigid piles are not connected to the structure. The soil reinforcement technique with rigid piles is suitable for the structures like embankments, pavements, industrial areas, hydraulic treatment plants. These doctoral theses permits lo better understand the phenomena of load transfer mechanisms associated with rigid plies. Firstly, the mechanical behaviour of granular and treated soils has been investigated by laboratory tests. Then centrifuge tests were performed to understand the influence of the earth platform mechanical properties and geometric configuration of rigid piles on rigid load transfer mechanisms. Numerical approaches basin on finite element and finite difference are presented. The geometric parameters of rigid piles and mechanical characteristics of mattress distribution are investigated by a parametric study. The results of numerical modelling provide important information on the functioning mechanisms of rigid plies. The dynamic behaviour of rigid Inclusions is studied. The vertical and horizontal dynamic response of rigid piles is analyzed. A three-dimensional dynamic analysis of rigid piles is presented to understand the influence of the top and tip fixations on the dynamic behaviour of these rigid piles
Fontaine, Olivier. "Contribution à l'étude des processus électrochimiques dans les liquides ioniques : transferts électroniques hétérogènes, électrochimie localisée et électrogreffage d'un sel de diazonium." Paris 7, 2009. http://www.theses.fr/2009PA077232.
Повний текст джерелаThe main objective of this work is to understand the electron transfer and the mass transport in ionic liquid. So, a particular ionic liquid is presented: a redox ionic liquid. This molecule can be the solvent, the electrolyte and a redox species. One of its possible applications is in photovoltaic devices. The electrochemistry of this molecule had been studied with different methods: ultramicroelectrodes, electrochemistry impedance spectroscopy and scanning electrochemistry microscopy. In ionic liquid, the dynamics of mass transport and electronic transport are slowed compared to molecular solvents due to the increase in viscosity. In this redox ionic liquid, we have shown a succession of bimolecular reactions to transfer the electrons. With the electrochemistry microscopy, it is possible to access the kinetics of the electron transfer in a thin layer configuration. To illustrate the impact of ionic liquid in electrochemistry reactions, we have studied a modification of surface in ionic liquid. The reduction of diazonium salt had been chosen for this study. The more the viscosity is increased, less quantity is deposited
Molina, Carole. "Influence de la pulsation liquide sur les phénomènes de transfert de charge et de matière au sein d'une électrode poreuse percolée : application à la récupération de cadmium sur des particules de carbone." Toulouse, INPT, 1991. http://www.theses.fr/1991INPT031G.
Повний текст джерелаOropeza, Guzman Mercedes Teresita. "Modèle de ségrégation et de circulation des particules au sein d'une électrode poreuse percolée pulsée axiale : récupération de cuivre en milieu acide sulfurique." Toulouse, INPT, 1994. http://www.theses.fr/1994INPT046G.
Повний текст джерелаBaranov, Alexeï. "Apport de la spectroscopie Mössbauer à l'étude des phénomènes électroniques et structuraux au sein de réseaux oxygénés renfermant un élément de transition à un degré d'oxydation élevé." Bordeaux 1, 2007. http://www.theses.fr/2007BOR13449.
Повний текст джерелаThis thesis is devoted to the study of electronic phenomena, structural and magnetic transitions through Mössbauer Spectroscopy using 57Fe as local probe (1 to 2% at. ). Three different matrixes have been selected: (i) the nickelates TNiO3 with the perovskite structure (T=rare-earth, Y, Tl), (ii) the copper 3+ oxides: LaCuO3 with the perovskite structure, SrLaCuO4 and La2Li0. 50Cu0. 50O4 with the K2NiF4-type structure, (iii) the oxide CaMn7O12 with a structure derived from the perovskite (CaMn )(Mn Mn4+)O12 where a Jahn-Teller cation (Mn3+) can occupy the A site. Mössbauer spectroscopy has allowed to underline the following electronic and structural phenomena: (i) for the TNiO3 matrixesthe insulationmetal transition, the disproportionation, the magnetic ordering involving two Ni3+ electronic configurations; (ii) for the Cu3+ Oxides: the charge transfert Cu3+ O Cu2+ OL; (iii) in the case of CaMn7O12 matrix two phenomena: a second order structural transition (rhomboedral cubic) (387T455 K), a second order magnetic transition close to 90 K
Clolus, Elisabeth. "Étude photoélectrochimique de couches minces semiconductrices polycristallines de Cu(In,Ga)Se2 en milieu aqueux." Paris 6, 2003. http://www.theses.fr/2003PA066061.
Повний текст джерелаKHOUDIR, AHMED. "Contribution a l'etude theorique des effets de substitution sur les transferts de charge et les excitations de cur : molecules isolees ou en interaction avec des agregats de metaux de transition." Paris 7, 1999. http://www.theses.fr/1999PA077124.
Повний текст джерелаRollet, Anne-Julia. "Etude et gestion de la dynamique sédimentaire d'un tronçon fluvial à l'aval d'un barrage : le cas de la basse vallée de l'Ain." Phd thesis, Université Jean Moulin - Lyon III, 2007. http://tel.archives-ouvertes.fr/tel-00221368.
Повний текст джерелаDans un premier temps, nous avons identifié les effets de la chaîne de barrages sur la morphologie de l'Ain dont les variables de contrôle ont été profondément modifiées depuis la fin du 19e siècle (chapitre 2). Pour cela, nous avons tout d'abord analysé finement la trajectoire contemporaine du cours d'eau en nous focalisant sur deux paramètres d'ajustement (la largeur et le profil en long). Ceci nous a permis, ensuite, de distinguer, au sein de cette trajectoire, les effets des barrages sur les variables de contrôle (charge de fond depuis 1931 et débit depuis 1968) et sur les ajustements morphologiques qui ont pu en découler. L'amplitude des modifications des variables de contrôle imputables aux barrages, ainsi que l'extension spatiale actuelle des ajustements fluviaux en lien avec ces modifications, ont été ensuite déterminées à partir des jeux de données disponibles (photographies aériennes) et de mesures collectées sur le terrain (granulométrie).
Dans un second temps, nous avons cherché à approfondir nos connaissances relatives à la dynamique sédimentaire de l'Ain (détermination des entrées sédimentaires, des dépôts, des capacités du cours d'eau à évacuer la charge disponible, quantification des excédents énergétiques du cours d'eau) pour définir l'amplitude actuelle du déficit sédimentaire du cours d'eau, mais également pour déterminer les évolutions à venir et les préconisations de gestion à envisager (chapitre 3). Trois approches ont été utilisées et adaptées pour aborder cet aspect : la construction d'un budget sédimentaire par tronçons homogènes, des mesures directes de transport solide, et la détermination de la capacité de transport à l'aide de formules hydrauliques. Ces trois techniques ont permis d'effectuer une validation croisée des résultats obtenus, qui montrent la nécessité de mettre en place rapidement des mesures de gestion pour augmenter les introductions de charge sédimentaire en amont du système. Il semble ainsi que le chenal ne soit plus en mesure d'assurer seul sa recharge en sédiment et qu'aucune entrée sédimentaire conséquente ne soit susceptible d'enrayer la progression du déficit évalué à 10-15 000 m3.an -1.
Ces résultats ont ainsi servi de base pour la définition d'un plan de gestion durable de la dynamique sédimentaire de l'Ain (chapitre 4) qui présente un double objectif, à la fois préventif (préservation des secteur à méandres mobiles) et curatif (réhabilitation de la dynamique latérale des secteurs déjà déficitaires). Après avoir présenté l'ensemble des actions potentiellement envisageables sur des tronçons à l'aval de barrages, nous avons sélectionné les mesures les plus adaptées techniquement et économiquement à notre contexte. Nous présentons enfin les premières opérations de recharge artificielle qui ont été réalisées à la suite de ces préconisations.
Plante, Ianik. "Conception d'une interface informatique couplée à un code de simulation Monte-Carlo de la radiolyse de l'eau, permettant la visualisation en trois dimensions de la trajectoire d'une particule chargée incidente et de toutes les espèces radiolytiques formées en fonction du temps." Mémoire, Université de Sherbrooke, 2005. http://savoirs.usherbrooke.ca/handle/11143/3393.
Повний текст джерелаEl, Boujaddaini Mohamed Najib. "Modélisation et étude expérimentale du comportement thermo hydraulique des fluides frigoporteurs diphasiques." Thesis, Lyon, INSA, 2011. http://www.theses.fr/2011ISAL0019.
Повний текст джерелаThis work concerns the experimental investigation and modelling of the thermo hydraulic behaviour of a new Iwo-phase secondary refrigerant, the paraffin slurry, flowing through a rectangular channel of a heat plate exchanger type. The paraffin slurries are made of millimetric bullets of paraffin, stabilized in an organic porous polymeric matrix, in suspension in water serving as a carrying fluid. The paraffin particles used contain 75% of paraffin called NORPAR®15 and 25% of a tri-block polymer of styrene with High Molecular Weight (HMW). The experimental results generated by the heat balances on the test sections of the experimental setup built in the Thermal Center of Lyon (CETHIL), highlight an important increase of the heat transfer coefficient, due to the particles presence in the carrying fluid. For a laminar flow of the paraffin slurry in the cold channel, an average multiplication by 1 .25 to 1.5 of the global heat transfer coefficient compared to the single-phase fluid was recorded for particles mass fractions of 6 to 12%. By regression of the experimental results, correlations for the local and average Nusselt number calculation for the laminar flows are proposed. The particularity of the presented correlations is their validity in the case of a pure fluid as we\l as for a two-phase fluid containing so\id particles. A model for the hydraulic and thermal behaviours studies of a Iwo-phase secondary refrigerant fluid during its cooling in laminar flow through a rectangular channel was developed it is based on the mixture model and to king the slip velocity into account. The evolution of the experimental and theoretical values for the fluid average temperature, the heat flow which crosses the walls and the heat transfer coefficient between the wall and fluid shows good agreement and the model is satisfactory since the variations never exceed 14%
Fall, Sadiara. "Etude du transport de charges dans les polymères semi-conducteurs à faible bande interdite et de son impact sur les performances photovoltaïques." Phd thesis, Université de Strasbourg, 2013. http://tel.archives-ouvertes.fr/tel-00975750.
Повний текст джерелаHauchecorne, Mathieu. "La fabrication transnationale des idées politiques : Sociologie de la réception de John Rawls et des "théories de la justice" en France (1971-2011)." Thesis, Lille 2, 2011. http://www.theses.fr/2011LIL20013.
Повний текст джерелаSpanning the sociology of elites, intellectual history, and reception studies, this research explores how theories and political ideas are circulated across countries and disciplines, as well as between the academic and political worlds. Starting in 1971, it studies the French intellectual and political reception of John Rawls’s theory of social justice, and more broadly of the debates it sparked in the English-speaking world. Contributing to a historical sociology of political ideas, this dissertation combines ethnography in think-tanks and academic conferences, as well as in online discussions, with a statistical survey, and the study of archives of publishers, academics and administrations. Through the exploration of references to Rawls, Sen or Walzer in academia, the press, political platforms or curricula, we show how this reception is an analyzer of broader changes, such as the growing dominance of English in transnational cultural exchanges, the declining recourse to Marxist and Keynesian paradigms in the French Left, and the questioning of centrality of structuralism in social sciences and the humanities in France. It shows that the very diverse ways in which “theories of justice” have been appropriated and circulated in France depend on the social location of their mediators, and on how their networks are structured. Whereas the sociology of reception has often overlooked the internal analysis of appropriations, this research shows how analyzing them sociologically helps explain why these mediators felt elective affinities with Rawls’s thought, despite national, disciplinary and sectoral boundaries
Castella, Martine. "Photophysique de complexes de molécules aromatiques formés en jet supersonique : spectroscopie electronique et calcul des surfaces d'énergie potentielle." Paris 11, 1987. http://www.theses.fr/1987PA112503.
Повний текст джерелаDe, la cruz sanchez Carmen Mariella. "Utilisation de conduites de séchage oscillantes pour réduire les contraintes liées au retrait du bois." Phd thesis, AgroParisTech, 2012. http://pastel.archives-ouvertes.fr/pastel-00839297.
Повний текст джерелаBen, Dkhil Sadok. "Cellules solaires hybrides transparentes à base de nanofils de silicium et du poly(vinylcarbazole)." Thesis, Lyon 1, 2012. http://www.theses.fr/2012LYO10130.
Повний текст джерелаThe work presented in this thesis focuses on the implementation and study of hybrid solar cells interpenetrating networks using silicon nanowires. Our studies have focused on the optimization of hybrid structures based PVK or MEH-PPV mixed in their volume with silicon nanowires phase, referring to structures PVK/NFSI and MEH-PPV/NFSI respectively. This study showed the close interdependence between morphology and properties of nanocomposites photovoltaic cells made. We studied the influence of the concentration of silicon nanowires on the dissociation process of photo-generated pairs. We also studied the effect of heat treatment and we have demonstrated a better load transfer in the case of structures PVK/NFSI. We also observed the beneficial effect of deoxidation treatment and functionalization of the nanowires on the improvement of charge transfer in the case of structures made. In conclusion, we have shown that the PV hybrid cell using silicon nanowires can be optimized through understanding and fine tuning of the charge transfer
De, la Cruz Sanchez Carmen Mariella. "Utilisation de conduites de séchage oscillantes pour réduire les contraintes liées au retrait du bois." Thesis, Paris, AgroParisTech, 2012. http://www.theses.fr/2012AGPT0068/document.
Повний текст джерелаWood drying is an essential process in the wood industry. A perfect control of wood drying is nowadays very important for the wood industry. In this study, we propose the utilization of oscillating drying conditions to reduce the drying stresses induced by wood shrinkage by activating the mechanosorptive creep. The best way to apply this concept remains an open question in the scientific community. Beech wood (Fagus sylvatica), one of the most commonly used hardwood in France, was chosen for this study owing its elevated risk of drying defaults. The effect of oscillating conditions on drying stresses inside the boards was studied by both an experimental and a theoretical approach, structured in three parts: - A first experimental part realized with a semi – industrial kiln in order to study the global effect of oscillating conditions at the stack scale. Improvement of the quality of dried wood was showed by the best homogeneity of water content inside the board and among the boards and by the decrease of global deformations and residual stresses expressed by the gap measured by the slicing test. - The study was continued with a theoretical part based on analytical and numerical modeling to understand the development of internal heat and mass transfers inside the boards and the evolution of drying stresses during oscillating conditions. A simple analytical model adapted to the oscillating conditions was proposed, particularly for kiln users who don't have access to sophisticated numerical tools. The numerical approach used the simulation tool TransPore, able to simulate oscillating drying in more realistic conditions. Its mechanical module was used to set accurate drying schedules to study the effect of oscillating conditions on stresses relaxation. - Finally, a second experimental part was performed in a laboratory scale kiln, at the board scale, to test the information obtained theoretically. A non-symmetrical drying device (flying wood) and two different loaded drying devices (cantilever beam test and three points bending) were used to study the effect of oscillations. However, it is difficult to see the oscillating conditions effect on the stresses relaxation. The confrontation between experimental results at the board scale and the numerical simulation showed the significant effect produced on experimental results by parasite oscillations of small periods and intensities, originated by the kiln regulation. Further work should consider some modifications of the time dependent mechanical behavior model in order to capture the experimentally observed behavior
Paroissien, Eric. "Contribution aux assemblages hybrides (boulonnés/collés) - Application aux jonctions aéronautiques." Phd thesis, Université Paul Sabatier - Toulouse III, 2006. http://tel.archives-ouvertes.fr/tel-00171103.
Повний текст джерелаRekab, Wassima. "Multicomponent assemblies for organic electronics." Thesis, Strasbourg, 2017. http://www.theses.fr/2017STRAF002.
Повний текст джерелаThis thesis is focused on the investigation of supramolecular assemblies and the charge carriers transport across organic single, bi- and three-component materials, used as the active layer in organic field-effect transistors (OFET), phototransistors (OPT) and complementary inverters. We demonstrated that thermal annealing and duration has high impact in OFET performances based on a fullerene derivative called ICBA. The devices electron mobility enhanced upon HMDS and OTS treated SiO2 surface and reached 0.1 cm2V-1s-1, which is the highest reported value in literature. We have provided evidence for the influence of the order at the supramolecular level in the semiconducting material (PDIF-CN2) on the performance of OPTs. We compared solution processed single crystalline PDIF-CN2 fibers and multifiber assemblies with spin-coated thin films, which revealed that the former exhibited good electron mobility up to 2 cm2s-1V-1. The improved fiber crystallinity allows efficient collection of photogenerated excitons, results in the highest reported responsivity R (>5 × 103 AW-1), and photoswitching ratio P (>2 × 103), which are to date the highest reported in literature for PDI-single crystal OPTs. Finally, we have performed for the first time new multifunctional devices combining an ambipolar polymer (DPPT-TT) with inserted diarylethene molecules in its matrix. The fabricated OFET and organic complementary inverters were optically controlled. The resultant inverters gain values are tuned by ultraviolet and visible light irradiation, reaching 504, which is higher than those reported in literature (86). These findings qualify them as promising potential candidates for the construction of high-performance integrated logic circuits and memory chips