Teses / dissertações sobre o tema "Transports couplés"
Crie uma referência precisa em APA, MLA, Chicago, Harvard, e outros estilos
Veja os 50 melhores trabalhos (teses / dissertações) para estudos sobre o assunto "Transports couplés".
Ao lado de cada fonte na lista de referências, há um botão "Adicionar à bibliografia". Clique e geraremos automaticamente a citação bibliográfica do trabalho escolhido no estilo de citação de que você precisa: APA, MLA, Harvard, Chicago, Vancouver, etc.
Você também pode baixar o texto completo da publicação científica em formato .pdf e ler o resumo do trabalho online se estiver presente nos metadados.
Veja as teses / dissertações das mais diversas áreas científicas e compile uma bibliografia correta.
Bouyssier, Julien. "Transports couplés en géométries complexes". Toulouse 3, 2012. http://thesesups.ups-tlse.fr/1929/.
Texto completo da fonteThis work interest is about stationary transfer and non-stationary transport by convection-diffusion onto complex geometries. For transport issues, complex refers to convection into flattened cavity of arbitrary transverse shape, slowly varying along the longitudinal direction. In the context of transfer, complex refers to non-axisymmetric domains of arbitrary transverse shape along which one or several parallel tubes convect heat or mass. For the transfer problem, this work extends the principle, validates the use, and illustrates the efficiency of Graetz modes decompositions for exchanges prediction in realistic exchangers configurations. This decomposition permits to formulate the initial 3D problem as a generalysed 2D eigenvalue problem, the numerical evaluation of which is drastically reduced. We generalyze Graetz modes solutions for arbitrary applied lateral boundary conditions. In the particular case of balanced exchangers, we bring to the fore a new neutral mode whose longitudinal variations are linear as opposed to classical Graetz modes displaying exponential decay. The numerical computation of those modes for semi-infinite configurations with lateral periodic boundary conditions shows that a few number of those provides a very good approximation for exchanges. In the case of finite exchangers coupled with inlet/oulet tubes, we show how to evaluate the amplitudes of Graetz modes in the various domains (inlet, exchanger, outlet) from functional minimization associated with input/output boundary conditions. The evaluation of these amplitudes permit a systematic parametric study of temperature fields, heat fluxes between fluid and solid, and hot/cold performance of a couple-tube exchanger. Our results indicate that the typical exchange length is governed by the first Graetz mode at large P\'eclet number. We also show that a symmetric exchanger has a symmetric spectrum and a upward/backward symmetric evolution. In the case transport we elaborate theoretically the conservative form of 3D Taylor dispersion equations into variable cavities which generalyzes the framework already known in 2D. We numerically implement these averaged dispersion equations with finite element, and validate in 2D the obtained results. We show that 3D longitudinal variations of a cavity has a strong impact on the longitudinal dispersion
Marino, Sonia. "Phénomènes de transports couplés induits par des circulations de fluides dans des milieux poreux et fracturés". Paris 7, 2002. http://www.theses.fr/2002PA077119.
Texto completo da fonteNumbonui, Ghogomu Julius. "Transports facilités et actifs couplés à l'énergie thermique dans les systèmes membranaires non-isothermes. Applications à l'acide borique et au gaz carbonique". Rouen, 1993. http://www.theses.fr/1993ROUES058.
Texto completo da fonteRodriguez, Julio. "Déshydratation par effet de serre d'un produit emballé dans un film polymère perméable aux molécules d'eau : approche expérimentale et de modélisation". Phd thesis, Paris, ENSAM, 2006. http://pastel.archives-ouvertes.fr/pastel-00002348.
Texto completo da fonteDécultot, Léa. "Étude et modélisation du procédé de refusion par plasma d’arc en creuset froid (PAMCHR) d’alliages de titane pour des applications aéronautiques". Electronic Thesis or Diss., Université de Lorraine, 2021. http://www.theses.fr/2021LORR0031.
Texto completo da fonteThe recycling of titanium scraps can be achieved using the Plasma Arc Melting Cold Hearth Refining (PAMCHR) process with the aim of producing aeronautical titanium alloy ingots. In this manuscript, the research work focuses on the refining stage of the process where the liquid is transported in a horizontal copper water-cooled crucible. This important step takes place downstream the melting of the charge and upstream the casting of liquid titanium into the ingot mold crucible. Plasma torches are used as heat source of PAMCHR process, which is conducted under an atmosphere of inert gas. A three-dimensional modeling of the thermo-hydrodynamic flow of the titanium alloy has been set up based on Ansys-Fluent CFD software. The purpose of this tool, named PAM3D, is to improve our understanding of the liquid titanium behavior within the refining crucible. A large number of user functions have been integrated into the model to describe, among other mechanisms, the thermal and momentum transferred from the plasma plume to the surface of the liquid bath. The analysis of these transfers is essential for modeling the process. They are obtained by a study coupling melting tests, carried out in a pilot PAMCHR furnace, and numerical modeling. Numerical results, obtained by this first version of PAM3D are compared to experimental measurements, and the agreement is satisfactory. However, the maximum value of the shear stress, due to the impact of the plasma plume on the bath surface, implemented in the model seems to be underestimated. Moreover, complementary simulations highlight the important role of hydrodynamic forces on the thermal behavior of the bath, and in particular of this shear stress
Roche, Benoît. "Transport électronique à travers deux dopants, en régime statique et dynamique dans des transistors silicium". Phd thesis, Université de Grenoble, 2012. http://tel.archives-ouvertes.fr/tel-00947330.
Texto completo da fonteRaturi, Sagar. "Energetics and structural aspects of cation-coupled drug transport by NorM multidrug transporters". Thesis, University of Cambridge, 2018. https://www.repository.cam.ac.uk/handle/1810/284914.
Texto completo da fonteAmir, Laila. "Modèles couplés en milieux poreux : transport réactif et fractures". Phd thesis, Université Paris Dauphine - Paris IX, 2008. http://tel.archives-ouvertes.fr/tel-00373688.
Texto completo da fonteCe travail est divisé en trois parties : la première partie contient une analyse de différents schémas numériques pour la discrétisation des problèmes d'advection-diffusion, notamment par une technique de séparation d'opérateurs, ainsi que leur mise en oeuvre informatique, dans un code industriel.
La deuxième partie, qui est la contribution majeure de cette thèse, est consacrée à la modélisation et à l'implémentation d'une méthode de couplage globale pour le transport réactif. Le système couplé transport-chimie est décrit, après discrétisation en temps, par un système d'équations non linéaires. La taille du système sous-jacent, à savoir le nombre de points de grille multiplié par le nombre d'espèces chimiques, interdit la résolution du système linéaire par une méthode directe. Pour remédier à cette difficulté, nous utilisons une méthode de Newton-Krylov qui évite de former et de factoriser la matrice Jacobienne.
Dans la dernière partie, nous présentons un modèle d'écoulement dans un milieu fracturé tridimensionnel, basé sur une méthode de décomposition de domaine, et qui traite l'intersection des fractures. Nous démontrons l'existence et l'unicité de la solution, et nous validons le modèle par des tests numériques.
Amir, Laila. "Modèles couplés en milieux poreux : transport réactif et fractures". Phd thesis, Paris 9, 2008. https://bu.dauphine.psl.eu/fileviewer/index.php?doc=2008PA090061.
Texto completo da fonteThis thesis deals with numerical simulation of coupled models for flow and transport in porous media. We present a new method for coupling chemical reactions and transport by using a Newton-Krylov method, and we also present a model for in fractured media, based on a domain decomposition method that takes into account the case of intersecting fractures. This study is composed of three parts: the first part contains an analysis, and implementation, of various numerical methods for discretizing advection-diffusion problems, in particular by using operator splitting methods. The second part is concerned with a fully coupled method for modeling transport and chemistry problems. The coupled transport-chemistry model is described, after discretization in time, by a system of nonlinear equations. The size of the system, namely the number of grid points times the number a chemical species, precludes a direct solution of the linear system. To alleviate this difficulty, we solve the system by a Newton-Krylov method, so as to avoid forming and factoring the Jacobian matrix. In the last part, we present a model of flow in 3D for intersecting fractures, by using a domain decomposition method. The fractures are treated as interfaces between subdomains. We show existence and uniqueness of the solution, and we validate the model by numerical tests
Bendjebbar, Fatna. "Modélisation hydrodynamique d'une torche à plasma couplée inductivement". Thesis, Clermont-Ferrand 2, 2013. http://www.theses.fr/2013CLF22340/document.
Texto completo da fonteThe purpose of the work was the numerical modeling of the inductive coupling plasma torch. (ICP). We have established the necessary databases: composition, thermodynamic and transport properties applied to argon mixtures of nitric acid and water. The hydrodynamic model of the ICP torch (7 coils) considers the plasma at thermodynamic equilibrium and uses the Navier-Stokes equations to describe the plasma flow and the Maxwell equations to describe the evolution of the electric field and the magnetic field
Safi, Mohammed. "Stabilité de Lyapunov de systèmes couplés impliquant une équation de transport". Thesis, Toulouse, ISAE, 2018. http://www.theses.fr/2018ESAE0022/document.
Texto completo da fonteThe purpose of this thesis is the study of stability and control properties for linear systems described by partial differential equations (PDE) or delay differential equations. We wish to use in this thesis the relationship between these two classes of infinite-dimensional systems in view of developing a new paradigm for their analysis. Indeed, in many applications, it is possible to choose one or the other of these two classes of systems to model the dynamics of the system under consideration. For example, traffic flow can be modeled using PDE type of transportation [JKC], but also by a distributed delay model [SMP] or discrete delay [SN]. We may also refer to the work of Krstic [K] on the formulation of a delay system as an PDE system. These two classes of systems are special cases of infinite dimensional systems, unlike the case of finite-dimensional systems, we better called state functions rather than the state vector. This implies that the analysis is more delicate and refers to the use of dedicated tools. As part of the thesis, the student will focus on approaches based on an extension of Lyapunov theorem for infinite dimensional systems using specific functional. As for the modeling process, the stability analysis of delayed or PDE type systems can be conducted using very similar Lyapunov functionals. We hope that this thesis builds on existing work in the two communities on delay systems and PDE to develop an innovative and unified approach to the analysis and control of infinite dimensional systems. To do so, the candidate will build on its skills in automatic and mathematics as well as the on from expertise of both supervisors. Several contributions are expected during the thesis . Initially, we aim at extedning recent results [SG13,14] developed in the context of the stability analysis of delay systems to the case of systems governed by PDE. These first results will provide the basis for the design of robust control laws for various applications including traffic control, vibration control, etc ... Cette thèse portera sur l’étude des propriétés de stabilité et de contrôle des systèmes linéaires de dimension infinie, plus particulièrement écrits à l’aide d’EDP ou d’équations à retard. L’intérêt naturel pour l’étude de cette classe de systèmes à la frontière entre mathématiques appliquées et automatique connaît un succès grandissant de part la large gamme d’applications en contrôle pouvant être décrites par ces modèles : en ingénierie, biologie, informatique… L’émulation scientifique entre systèmes à retard et systèmes de type EDP permettra en outre à cette thèse de tirer parti des méthodes et outils propres à chacun des ces domaines. This PhD proposal in automatic control requires several skills including knowledge on Lyapunov theory for systems with or without delay , on linear matrix inequalities while relying on mathematical tools applied in the study of partial differential equations ( linear algebra functional analysis , Hilbert spaces , Sobolev)
Ippisch, Olaf. "Coupled transport in natural porous media". [S.l. : s.n.], 2001. http://deposit.ddb.de/cgi-bin/dokserv?idn=96376022X.
Texto completo da fonteIppisch, Olaf. "Coupled transport in natural porous media". [S.l. : s.n.], 2003. http://www.bsz-bw.de/cgi-bin/xvms.cgi?SWB10605053.
Texto completo da fonteSimpson, Brent W. "Genetic investigation of how an ATP hydrolysis cycle is coupled to lipopolysaccharide transport". The Ohio State University, 2018. http://rave.ohiolink.edu/etdc/view?acc_num=osu1523988371297363.
Texto completo da fonteKronbichler, Martin. "Computational Techniques for Coupled Flow-Transport Problems". Doctoral thesis, Uppsala universitet, Avdelningen för teknisk databehandling, 2011. http://urn.kb.se/resolve?urn=urn:nbn:se:uu:diva-162215.
Texto completo da fonteMavkov, Bojan. "Control of coupled transport in Tokamak plasmas". Thesis, Université Grenoble Alpes (ComUE), 2017. http://www.theses.fr/2017GREAT004/document.
Texto completo da fonteThe objective of this thesis is to propose new methods for analysis and control of partial differential equations that describe the coupling between the transport models of the electron pressure (density multiplied by the temperature) and the magnetic flux in the tokamak plasma. The coupled system is presented by two1D resistive diffusion equations. In this thesis two kinds of control models are obtained. The first is a first-principle driven model and the second one is the data-driven model obtained using system identification techniques. The control design is based on an infinite dimensional setting using Lyapunov analysis. Composite control is designed using singular perturbation theory to divide the fast from the slow component. All the theoretical work is implemented and benchmarked in advanced physics based on simulations using plasma simulator dor DIII-D, ITER and TCV tokamaks
Chupin, Olivier. "Écoulement et transport couplés en milieux poreux saturés : application à l'injection des sols". Nantes, 2005. http://www.theses.fr/2005NANT2096.
Texto completo da fonteLefevre, Benoit. "La soutenabilité environnementale des transports urbains dans les villes du sud : Le couple « transport – usage des sols » au cœur des dynamiques urbaines". Paris, ENMP, 2007. http://pastel.paristech.org/3538/01/BLEFEVRE_THESEFINALE_DEF.pdf.
Texto completo da fonteThe objective of this PhD dissertation is to explore if, in view of rapid demographic growth and limited financial capacities, the technologies accessible to poor cities can decrease trajectories of energy consumption and CO2 emissions due to urban transportation. Chapter 1 reviews what we already know of the determinants involved, and their recent evolutions. Chapter 2 analyzes conceivable transport and land-use solutions that would allow southern cities to attain sustainable development trajectories. The conclusions drawn from the first two chapters led us to analyze the interactions between the transport system and land-use system on a particular city, Bogota (Colombia). Chapter 3 studies the functional relations in the “Transport – Land Use” couple and its impact on urban space structuring processes in the long term, from the foundation of Bogota to the end of the 20th century. Chapter 4 focus on the impact of a new transportation infrastructure – the TransMilenio Bus Rapid Transit (BRT) – on real-estate and housing markets, on urban structure and the Origin-Destination trip matrix. Chapter 5 reviews the existing prospective tools able to simulate various combinations of realistic policies, and to measure their consequences on the levels of energy consumption and CO2 emissions related to urban transportation. The integrated urban “Transport – Land Use” model, TRANUS, is chosen and completed with a module of of energy consumption and CO2 emissions quantification, called “Energy Signature of Urban Transportation” (SETU). Chapter 6 tests the capacity of these combinations of policies to affect the trajectories of the energy consumption of urban transportation through the application of TRANUS-SETU on a case study, Bangalore (India)
Rashid, Mohammad Zunaidur. "ATOMISTIC MODELING OF COUPLED ELECTRON-PHONON TRANSPORT IN NANOSTRUCTURES". OpenSIUC, 2021. https://opensiuc.lib.siu.edu/dissertations/1939.
Texto completo da fonteInzoli, Isabella, Signe Kjelstrup, Dick Bedeaux e Jean-Marc Simon. "The coupled transport of heat and mass across a silicalite surface". Universitätsbibliothek Leipzig, 2015. http://nbn-resolving.de/urn:nbn:de:bsz:15-qucosa-189575.
Texto completo da fonteLarisch, Wolfgang. "4 Coupled compartments – an analytical solution for diffusion and reaction kinetics". Universitätsbibliothek Leipzig, 2016. http://nbn-resolving.de/urn:nbn:de:bsz:15-qucosa-198373.
Texto completo da fonteDi, Giulio Eugenio <1986>. "Improvement of photon transport model by including coupled photon-electron transport and kernel refinement". Doctoral thesis, Alma Mater Studiorum - Università di Bologna, 2015. http://amsdottorato.unibo.it/6954/1/Eugenio_Di_Giulio_tesi.pdf.
Texto completo da fonteDi, Giulio Eugenio <1986>. "Improvement of photon transport model by including coupled photon-electron transport and kernel refinement". Doctoral thesis, Alma Mater Studiorum - Università di Bologna, 2015. http://amsdottorato.unibo.it/6954/.
Texto completo da fonteJakobsson, Håkan. "Discontinous Galerkin Methods for Coupled Flow and Transport problems". Thesis, Umeå universitet, Institutionen för matematik och matematisk statistik, 2009. http://urn.kb.se/resolve?urn=urn:nbn:se:umu:diva-51335.
Texto completo da fonteCastleton, I. M. "Electron transport in coupled one- and two-dimensional systems". Thesis, University of Cambridge, 1998. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.597365.
Texto completo da fonteGunduz, Orhan. "Coupled flow and contaminant transport modeling in large watersheds". Diss., Available online, Georgia Institute of Technology, 2004:, 2004. http://etd.gatech.edu/theses/available/etd-04092004-160146/unrestricted/gunduz%5Forhan%5F200405%5Fphd.pdf.
Texto completo da fonteDr. Paul Work, Committee Member ; Dr. Philip Roberts, Committee Member ; Dr. Mustafa Aral, Committee Chair ; Dr. Terry Sturm, Committee Member ; Dr. Turgay Uzer, Committee Member. Vita. Includes bibliographical references (leaves 442-466).
Xie, (Lily) Hong 1965. "Contaminant transport coupled with nonlinear biodegradation and nonlinear sorption". Diss., The University of Arizona, 1996. http://hdl.handle.net/10150/290676.
Texto completo da fonteArmstrong, Gillian. "Solute transport and intracellular pH in intestinal epithelial cells". Thesis, University of Newcastle Upon Tyne, 1996. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.320390.
Texto completo da fonteMarinoni, Marianna. "Implémentation des isotopes dans un modèle hydrogéochimique couplé". Thesis, Strasbourg, 2018. http://www.theses.fr/2018STRAH001/document.
Texto completo da fonteThe work describes the development of a reactive transport code named SpeCTr (Spéciation Cinétique Transport in French). The code, able to describe isotopic fractionation, is obtained through the coupling of a transport module and a reaction module that describes the main chemical reactions (operator splitting approach). A consistent portion of the work is dedicated to the improvement of the numerical methods employed in the reaction module for solving thermodynamic equilibrium (Newton Raphson method modified with scaling and Positive Continuous Fractions) and mixed equilibrium and kinetic reactions (formulation and solution of systems of differential and differential-algebraic equations). The code was verified through the solution of different benchmarks (batch and reactive transport simulations) and applied to perform 1D, 2D and 3D simulations of laboratory experiments dedicated to calcite crystals dissolution in a column of porous medium
Durand-Vidal, S. "Phenomenes de transports couples : acoustophorese et conductivite dans des solutions electrolytiques simples et micellaires". Paris 6, 1995. http://www.theses.fr/1995PA066308.
Texto completo da fonteSrinivasan, Venkatraman. "Analytical solutions for sequentially coupled multi-species reactive transport problems". Auburn, Ala., 2007. http://repo.lib.auburn.edu/07M%20Theses/SRINIVASAN_VENKATRAMAN_13.pdf.
Texto completo da fonteAbstract. Vita. "This thesis has produced the following three journal publications: 1) V. Srinivasan, T.P. Clement, and K.K. Lee. "Domenico solution -- Is it valid?", Ground Water, 25(2): 136-146, May 2007 ; 2) V. Srinivasan and T.P. Clement. "Analytical solutions for sequentially coupled reactive transport problems. Part I: Mathematical derivations", submitted May 2007, Advances in Water Resources ; 3) V. Srinivasan and T.P. Clement. "Analytical solutions for sequentially coupled reactive transport problems. Part II: Special cases, implementation and testing", submitted May 2007, Advances in Water Resources." -- From p. v. Includes bibliographic references (ℓ. 91-98)
Chang, Eric Kenneth. "Coupled sorption and transport of nonionic surfactants in natural soils". Thesis, Georgia Institute of Technology, 1999. http://hdl.handle.net/1853/21257.
Texto completo da fonteYoung, Carolyn. "Transport and charge sensing measurements of coupled quantum dot devices". Thesis, McGill University, 2012. http://digitool.Library.McGill.CA:80/R/?func=dbin-jump-full&object_id=106374.
Texto completo da fonteNous etudions la mesure de points quantiques doubles (DQDs), specifiquement le transport electronique et la detection de charge. Plusieurs propositions ont ete avancees pour des qubits bases sur les DQDs, qui rend ces systèmes interessants du point de vue du calcul quantique a l'etat solide. Cette these comprend trois etudes theoriques au sujet de la generation d'erreurs lors de la mesure des qubits DQD. Premierement, nous considerons les mesures de transport, et calculons la contribution a la conductance DQD des processus cotunneling impliquant l'occupation virtuelle des etats excites. Nous presentons une methode numerique efficace, basee sur le formalisme tight-binding, pour le calcul de la transmission DQD associee avec le cotunneling a deux electrons. Nous etudions l'effet des interactions electron-electron dans un modele d'interaction constante et, en traitant la puissance de tunnel entre les QDs exactement, examinons la limite de couplage fort. Nous generons des cartes de conductance theoriques qui refletent une vaste region de l'espace des parametres, et qui nous permettent de comparer l'incidence de cotunneling dans une variete de regimes electrostatiques. Ensuite, nous concentrons sur des mesures de detection de charge, et etudions le backaction Heisenberg associee a la mesure par un contact de point quantique (QPC). Nous montrons que la source fondamentale de backaction est du au bruit de charge du QPC, plutot que le bruit de courant. Nous formulons une borne inferieure rigoureuse pour l'ampleur du bruit de charge, et calculons les taux correspondants aux transitions inelastiques dans un qubit de charge DQD. Par ailleurs, nous montrons que les mecanismes de backaction associes avec le bruit de charge et de courrant, respectivement, peuvent en principe etre distingues quand le QPC est non-adiabatique. Nous appliquons egalement nos resultats au cas de qubits de spin, ou il y a deux electrons dans le DQD et la mesure est effectuee par la conversion entre spin et charge, et estimons les temps de relaxation et de decoherence correspondants.Finalement, nous etudions un effet backaction indirect associe a la lecture par un QPC. Dans notre modele, le bruit de charge du QPC sert a chauffer localement un bain de phonons, ce qui le conduit hors de l'equilibre. Ensuite, les phonons voyagent du QPC au DQD, ou ils sont absorbes de maniere resonante par le qubit, conduisant des transitions inelastiques. Ces transitions montrent une periodicite distincte en fonction de la frequence. De fortes oscillations dans l'occupation du DQD ont recemment ete mesurees experimentalement par deux groupes independants. Nous montrons que le couplage entre le bain de phonons et la charge du QPC peut conduire les phonons a concentrer, ce qui ameliore l'absorption de phonons resonants et produit l'effet vu au laboratoire.
Rjagopal, Ramasubramaniam. "Correlated single electron transport in capacitively coupled tunnel junction arrays /". view abstract or download file of text, 1999. http://wwwlib.umi.com/cr/uoregon/fullcit?p9957570.
Texto completo da fonteTypescript. Includes vita and abstract. Includes bibliographical references (leaves 95-97). Also available for download via the World Wide Web; free to University of Oregon users. Address:http://wwwlib.umi.com/cr/uoregon/fullcit?p9957570.
Ripplinger, Scott. "Development of a Coupled Fluid and Colloidall Particle Transport Model". DigitalCommons@USU, 2013. https://digitalcommons.usu.edu/etd/2041.
Texto completo da fonteJi, Yu Catherine Feng. "Comparative study of convective and diffusive transport phenomena within the opalinus clay of Mont Terri". Thesis, Aix-Marseille, 2017. http://www.theses.fr/2017AIXM0409/document.
Texto completo da fonteThe safety of radioactive waste disposal facilities in deep geological formation depends on the evaluation of the rock confining properties and the processes governing radionuclides transfer. The thesis is conducted in the framework of Deep Borehole experiment of the Mont Terri project. The purpose of this research is to build confidence with regard to understanding relative importance of diffusive and convective phenomena withine the Opalinus Clay (OPA) and to identify the impact of a hydraulic and chemical transient behaviour on the transfers of fluid and solutes, and anomalous pressures generation.A first experimental stage enabled to acquire the advective and diffusive transport parameters, and the associated driving forces, necessary to the evaluation of fluid and solute fluxes between the OPA and its adjacent aquifers. Temperature and pressure measurements revealed a geothermal gradient of 8.5 °C/100 m and an excess of hydraulic head of at least 60 m.The chloride profile inversion by a Bayesian method with a Monte Carlo Markov Chain algorithm validates the paleohydrological evolution proposed in the litterature, considering a pure diffusive transport through the argillaceous formation. The contribution of osmotic transport phenomena was assessed by interpreting the pressure profile, using transient simulations that takes into account the temporal evolution of chlorinity and pressure during the geological scenario, and pseudo steady-state simulations. This profile is reproduced by evaluating the coupled advective flux, including pure advection, chemo-osmosis and thermo-osmosis, with a major contribution of the latter process
Siqueira, Maicon Zaniboni. "Anisotropic shear viscosity and critical behavior of non-hydrodynamic quasinormal modes in strongly coupled plasmas". Universidade de São Paulo, 2017. http://www.teses.usp.br/teses/disponiveis/43/43134/tde-16082017-161531/.
Texto completo da fonteNessa tese usamos a dualidade holográfica calibre/gravidade para estudar dois aspectos diferentes de plasmas não-Abelianos fortemente acoplados. No primeiro tópico estudamos os efeitos de campos magnéticos (Abelianos) intensos sobre o coeficientes de transporte de um plasma não-Abeliano fortemente acoplado. Devido à anisotropia espacial criada pelo campo magnético, o tensor de viscosidade mais geral de um plasma magnetizado deve possuir 5 coeficientes de viscosidade de cisalhamento e 2 de viscosidade volumétrica. Usamos a correspondência holográfica para um plasma N=4 Supersimétrico de Yang-Mills (SYM) fortemente acoplado para calcular a viscosidade de cisalhamento perpendicular ao campo magnético e a viscosidade de cisalhamento paralela ao campo. Na presença do campo magnético, a viscosidade de cisalhamento perpendicular ao campo satura o limite viscoso de Kovtun-Son-Starinets enquanto que na direção paralela ao campo o limite é violado. O segundo tópico investigado nessa tese é motivado pelo estudo do comportamento próximo ao equilíbrio de plasmas não-Abelianos fortemente interagentes que exibem um ponto crítico em seus diagramas de fase. Focamos no espectro dos modos quasinormais não-hidrodinâmicos de um plasma N=4 SYM fortemente acoplado na presença de um potencial químico, que exibe um ponto crítico no equilíbrio. Exceto próximo ao ponto crítico, observamos que ao aumentar o potencial químico geralmente se intensifica a taxa de amortecimento dos modos quasinormais, que levam à redução dos tempos de equilibração característicos do plasma dual fortemente acoplado. Entretanto, aproximando-se do ponto crítico o tempo de equilibração típico aumenta embora sua derivada em relação ao potencial químico diverge com um expoente igual à -1/2. Encontramos também um modo não-hidrodinâmico puramente imaginário no canal de difusão vetorial com potencial químico não-nulo que dita o tempo de equilibração neste canal próximo do ponto crítico.
Larisch, Wolfgang. "4 Coupled compartments – an analytical solution for diffusion and reaction kinetics". Diffusion fundamentals 24 (2015) 32, S. 1, 2015. https://ul.qucosa.de/id/qucosa%3A13497.
Texto completo da fonteCopin, Reynald. "Etude du comportement tribologique de couples de matériaux sur tribomètre reproduisant les conditions de freinage ferroviaire". Lille 1, 2000. https://pepite-depot.univ-lille.fr/RESTREINT/Th_Num/2000/50376-2000-280.pdf.
Texto completo da fonteLa premiere etude vise a reproduire sur le tribometre les conditions de freinage du tgv avec le couple disque acier 28crmov5-08 / plot fritte. Il s'agit d'etudier l'influence sur le comportement tribologique du couple des principaux parametres de freinage et de comparer les resultats obtenus avec ceux de l'echelle 1. Ce dernier point a permis de valider le tribometre et le protocole experimental developpe pour cette etude
Le second cas industriel concerne l'etude du frein a sabots du metro de santiag du chili. L'objectif est d'effectuer une analyse comparative des performances de freinage des couples disques acier r2n ou r9td / garnitures composites dans les conditions de freinage rencontrees lors de la simulation de la ligne du metro. Ces performances sont exprimees en termes de coefficient de frottement moyen et de distances d'arret. Le materiau de friction utilise sur les tgv etant le materiau d'usure par definition, les recherches du point de vue du tribologue ont donc porte d'avantage sur ce materiau. Elles ont consiste a apprehender les mecanismes de formation et de destruction du 3 e m e corps recouvrant la surface apparente du plot. Cette etude est realisee a travers des observations macro-et microscopiques et des analyses chimiques du plot de friction. Les resultats issus de ces travaux ont montre que le pole frein dispose d'un outil performant pour l'etude du comportement tribologique d'un couple de materiaux dans des conditions de freinage ferroviaire donnees. Les observations et analyses chimiques de la surface du plot fritte ont permis de proposer une description phenomenologique des mecanismes physiques mis en jeu au contact au cours du freinage
He, Hongtao. "Vertical transport properties of weakly-coupled Ac-driven GaAs/AlAs superlattices /". View abstract or full-text, 2006. http://library.ust.hk/cgi/db/thesis.pl?PHYS%202006%20HE.
Texto completo da fonteBreider, Thomas James. "Coupled halogen-sulfur-aerosol modelling in a 3D chemical transport model". Thesis, University of Leeds, 2010. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.535692.
Texto completo da fonteIppisch, Olaf [Verfasser]. "Coupled Transport in Natural Porous Media (2. rev. Ed.) / Olaf Ippisch". Heidelberg : Universitätsbibliothek Heidelberg, 2003. http://d-nb.info/1185583955/34.
Texto completo da fonteMouchliadis, Leonidas. "Transport and coherence properties of indirect excitions in coupled quantum wells". Thesis, Cardiff University, 2008. http://orca.cf.ac.uk/54724/.
Texto completo da fonteCherubini, Yvonne. "Influence of faults on the 3D coupled fluid and heat transport". Phd thesis, Universität Potsdam, 2013. http://opus.kobv.de/ubp/volltexte/2014/6975/.
Texto completo da fonteFaults can act as conduits, barriers or mixed conduit/barrier systems to fluid flow. Therefore, faults may significantly influence fluid flow regimes operating in the subsurface, possibly resulting in distinct variations of the deep thermal field. Both, flow dynamics and temperature changes are in turn crucial factors that need to be taken into account for geothermal energy exploration. This study investigated the influence of faults on the subsurface fluid system and thermal field and explored the processes controlling fluid behavior and thermal distribution both within host rocks and faults. For this purpose, 3D finite element simulations of coupled fluid and heat transport have been carried out, both for synthetic and real-case model scenarios on different scales. A small-scale synthetic model was developed to systematically assess the impact of an inclined fault by changing gradually its hydraulic width and its permeability within the simulations. An observed linear inverse relationship revealed that changing the fault width by one order of magnitude results in a fluid velocity decrease (~1e-01 m/s) within the fault. A high permeability contrast between fault and matrix favors fluid advection into the fault and leads to pronounced pressure and temperature changes in and around the same domain. When the permeability contrast between fault domain and host rock is low, however, no fluid flow is observed in the fault, thus resulting in undisturbed hydrostatic pressure and temperature fields. On the basis of these synthetic fault modelling results, the influence of faults on a larger scale have been analyzed within a more complex (real-case) geological setting,- a 3D model of the geothermal site Groß Schönebeck
located ~40 km north of Berlin. The integration of one permeable and three impermeable major faults, resulted in distinct changes observed in the local fluid circulation, thermal and pressure field. Modelled convective circulation within the permeable fault decisively modifies the thermal field (up to 15 K). Within the low permeable faults, heat is transferred only by conduction, inducing no thermal imprint but local deviations of the hydrostatic pressure field. To investigate the impact of major fault zones on the basin-scale geothermal field, coupled fluid and heat transport simulations have been conducted for a 3D structural model for Brandenburg region (Noack et al. 2010; 2013). Different geological scenarios in terms of modelled fault permeability have been carried out of which two end member models are analyzed. The results showed that tight fault zones affect the flow field locally. Acting as hydraulic barriers, fluid flow is deviated with very low velocities along them within a range of ~ 1 km on either sides. The modelled local changes in the groundwater circulation system have no considerable effect on the temperature field. By contrast, permeable fault zones induce a pronounced signature on the thermal field extending over a distance of ~ 2.4-8.8 km at -1000 m depth and ~6-12 km at -3000 m depth. This thermal signature, characterized by alternating cooler and hotter temperature domains, is controlled by up- and downward directed flow within the fault domain, principally driven by existing hydraulic head gradients. All studies demonstrated that faults have a considerable impact on the fluid and heat flow. The permeability in faults and surrounding geological layers as well as the specific geological setting turned out to be crucial factors in controlling the different kinds of heat transfer mechanisms that may evolve in faults. Temperature variations caused by permeable faults may be local but significant as well as changes in fluid dynamics by both conduits and barriers. Thus, the results demonstrated the importance to consider faults in geothermal energy exploration. In the final analysis, the simulations for the small-, regional- and basin-scale models showed that the outcomes cannot be transferred by upscaling and that it is necessary to consider each geological setting separately with respect to its configuration and scale dimension. In summary, this study demonstrated that the consideration of faults in 3D finite element models for coupled fluid and heat transport simulations on different scales is feasible. As these type of numerical simulations integrate both, the structural setting of the subsurface and the physical processes controlling subsurface transport, the outcomes of this thesis may provide positive contributions in that they valuably complement field- and laboratory-based investigations.
Dmytruk, Olesia. "Quantum transport in a correlated nanostructure coupled to a microwave cavity". Thesis, Université Paris-Saclay (ComUE), 2016. http://www.theses.fr/2016SACLS335/document.
Texto completo da fonteIn this thesis, we study theoretically various physical properties of nanostructures that are coupledto microwave cavities. Cavity quantum electrodynamics (QED) with a quantum dot has been proven to be a powerful experimental technique that allows to study the latter by photonic measurements in addition to electronic transport measurements. In this thesis, we propose to use the cavity microwave field to extract additional information on the properties of quantum conductors: optical transmission coefficient gives direct access to electronic susceptibilities of these quantum conductors. We apply this general framework to different mesoscopic systems coupled to a superconducting microwave cavity, such as a tunnel junction, a quantum dot coupled to the leads, a topological wire and a superconducting ring. Cavity QED can be used to probe the finite frequency admittance of the quantum dot coupled to the microwave cavity via photonic measurements. Concerning the topological wire, we found that the cavity allows for determining the topological phase transition, the emergence of Majorana fermions, and also the parity of the ground state. For the superconducting ring, we propose to study the Josephson effect and the transition from the latter to the fractional Josephson effect, which is associated with the emergence of the Majorana fermions in the system, via the optical response of the cavity. The proposed framework allows to probe a broad range of nanostructures, including quantum dots and topological superconductors, in a non-invasive manner. Furthermore, it gives new information on the properties of these quantum conductors, which was not available in transport experiments
Danzer, Jörg. "Surfactant transport and coupled transport of polycyclic aromatic hydrocarbons (PAHs) and surfactants in natural aquifer material - laboratory experiments". Tübingen : Universität Tübingen, 2005. http://www.bsz-bw.de/cgi-bin/xvms.cgi?SWB12103792.
Texto completo da fonteSharma, Preeti. "Coupled electrokinetic fluxes in a single nanochannel for energy conversion". Thesis, Université Grenoble Alpes (ComUE), 2017. http://www.theses.fr/2017GREAY100/document.
Texto completo da fonteCoupled electrokinetic phenomena within nanochannel are of interest for energy harvestingand production of electricity based on the controlled mixing of river water with sea water known as "blue energy". The origin of the phenomena is related to interaction with charged walls and transport of ions within the so called Debye layer. This work aims at a better understanding of the physics and transport phenomena in this layer associated with solution confined in nanochannel.A specific instrumentation has been developed during this thesis to study the mechanisms governing coupled nanofluics fluxes. The idea is to characterize simultaneously the mass transport within the nanochannel and the electrical current driven through the nanochannel by the application of either salinity difference , pressure difference or voltage difference across the channel. The thesis is divided into three parts.In the first part, a custom made flow cell and experimental conditions to control and measure various fluxes is presented. The capability of cell to measure current or voltage under applied pressure or salinity gradient is presented taking the benefit of commercial nanoporous Nafion membrane.The second part is focused on an easy way of preparation of nanochannel sample in the form of single chip, in which nanochannel is interfaced to micro and macroscopic world. A well-controlled, 1.4µm long nanochannel of conical geometry with a maximum aspect ratio of 10 is fabricated. The minimum apex size of nanochannel achieved here is 50 nm which is about 30 times less than the length of channel. The presence of electrode directly at the interface of nano to micro cavity allow to perform electrical characterization of nanochannel with high precision.The third part of the thesis is devoted to the development of a method for the direct measurement of flow rate as low as 10 pL/min across a single nanochannel. This measurement approach combined with electrical measurement, could be used, in presence of pressure, voltage or salinity gradient, to measure the flow rate and the electrical current across a single nanochannel simultaneously and independently
Gatfield, Kelly. "Functional characterisation of mammalian Hâº-coupled amino acid transporters". Thesis, University of Newcastle Upon Tyne, 2007. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.438398.
Texto completo da fonteShaffer, Nathaniel R. "Theory of collisional transport in ultracold neutral plasmas". Diss., University of Iowa, 2018. https://ir.uiowa.edu/etd/6638.
Texto completo da fonteBeggs, Bruce Cameron. "Optical charge injection into a gallium arsenide acoustic charge transport device". Thesis, University of British Columbia, 1987. http://hdl.handle.net/2429/26681.
Texto completo da fonteApplied Science, Faculty of
Electrical and Computer Engineering, Department of
Graduate