Bibliografie tematiche / Transports couplés

Letteratura scientifica selezionata sul tema "Transports couplés"

Autore: Grafiati

Pubblicato: 8 giugno 2024

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Articoli di riviste sul tema "Transports couplés":

de Rouffignac, C. "Quelques pas en direction du site de reconnaissance de l'ion sodium au sein des protéines de transports couplés." médecine/sciences 12, n. 10 (1996): 1136. http://dx.doi.org/10.4267/10608/636.

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Bellot, J. P., A. Jardy e D. Ablitzer. "Simulation numérique des transports couplés au sein du puits liquide d'un lingot de titane refondu par bombardement électronique". Revue de Métallurgie 92, n. 12 (dicembre 1995): 1399–410. http://dx.doi.org/10.1051/metal/199592121399.

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Grogan, Dustin F. P., e Terrence R. Nathan. "Passive versus Active Transport of Saharan Dust Aerosols by African Easterly Waves". Atmosphere 12, n. 11 (16 novembre 2021): 1509. http://dx.doi.org/10.3390/atmos12111509.

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Theory and modeling are combined to reveal the physical and dynamical processes that control Saharan dust transport by amplifying African easterly waves (AEWs). Two cases are examined: active transport, in which the dust is radiatively coupled to the circulation; passive transport, in which the dust is radiatively decoupled from the circulation. The theory is built around a dust conservation equation for dust-coupled AEWs in zonal-mean African easterly jets. The theory predicts that, for both the passive and active cases, the dust transports will be largest where the zonal-mean dust gradients are maximized on an AEW critical surface. Whether the dust transports are largest for the radiatively passive or radiatively active case depends on the growth rate of the AEWs, which is modulated by the dust heating. The theoretical predictions are confirmed via experiments carried out with the Weather Research and Forecasting model, which is coupled to a dust conservation equation. The experiments show that the meridional dust transports dominate in the passive case, while the vertical dust transports dominate in the active case.

Li, Shuang, Yihu Yang e Weikai Li. "Human ferroportin mediates proton-coupled active transport of iron". Blood Advances 4, n. 19 (2 ottobre 2020): 4758–68. http://dx.doi.org/10.1182/bloodadvances.2020001864.

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Abstract As the sole iron exporter in humans, ferroportin controls systemic iron homeostasis through exporting iron into the blood plasma. The molecular mechanism of how ferroportin exports iron under various physiological settings remains unclear. Here we found that purified ferroportin incorporated into liposomes preferentially transports Fe2+ and exhibits lower affinities of transporting other divalent metal ions. The iron transport by ferroportin is facilitated by downhill proton gradients at the same direction. Human ferroportin is also capable of transporting protons, and this activity is tightly coupled to the iron transport. Remarkably, ferroportin can conduct active transport uphill against the iron gradient, with favorable charge potential providing the driving force. Targeted mutagenesis suggests that the iron translocation site is located at the pore region of human ferroportin. Together, our studies enhance the mechanistic understanding by which human ferroportin transports iron and suggest that a combination of electrochemical gradients regulates iron export.

Nathan, Terrence R., Dustin F. P. Grogan e Shu-Hua Chen. "Saharan Dust Transport during the Incipient Growth Phase of African Easterly Waves". Geosciences 9, n. 9 (5 settembre 2019): 388. http://dx.doi.org/10.3390/geosciences9090388.

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An analytical analysis is combined with numerical modeling simulations in order to expose the physical and dynamical processes that control the zonal-mean transport of Saharan mineral dust aerosols during the incipient growth phase of African easterly waves. The analytical analysis provides the theoretical basis for understanding and predicting how the waves and background flow combine to affect the zonal-mean eddy transports of dust. The analytically derived transport equations―which are valid for any wave field, irrespective of its spatial or temporal scale―predict that the eddy transports of dust are largest where the maximum in the background dust gradients coincide with a critical surface, i.e., where the Doppler-shifted frequency of the wave field vanishes. Linear simulations of the eddy dust transports are conducted using a mechanistic version of the Weather Research and Forecasting (WRF) model coupled to an interactive dust model. The simulations show that the eddy dust transports are directed down the background dust gradients and that the meridional transports of dust dominate over the vertical transports. The numerical simulations confirm the theoretical predictions. The predictions are used to explain recent statistical analyses of reanalysis data for dust-coupled African easterly waves.

Vellinga, Michael, e Peili Wu. "Relations between Northward Ocean and Atmosphere Energy Transports in a Coupled Climate Model". Journal of Climate 21, n. 3 (1 febbraio 2008): 561–75. http://dx.doi.org/10.1175/2007jcli1754.1.

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Abstract The Third Hadley Centre Coupled Ocean–Atmosphere General Circulation Model (HadCM3) is used to analyze the relation between northward energy transports in the ocean and atmosphere at centennial time scales. In a transient water-hosing experiment, where suppressing the Atlantic meridional overturning circulation (MOC) causes a reduction in northward ocean heat transport of up to 0.75 PW (i.e., 75%), the atmosphere compensates by increasing its northward transport of moist static energy. This compensation is very efficient at low latitudes and near complete at the equator throughout the experiment, but is incomplete farther north across the northern midlatitude storm tracks. The change in atmosphere energy transport enables the model to find a new global-mean radiative equilibrium after 240 yr. In a perturbed physics ensemble of HadCM3 it was found that time-averaged meridional energy transports in ocean and atmosphere can act opposingly. Where model formulation causes an unbalanced mean climate state, for example, an excessive top-of-the-atmosphere radiative surplus at low latitudes, the atmosphere increases its poleward energy transport to disperse this excess. MOC and ocean poleward heat transport tend to be reduced in such model versions, and this offsets the increased poleward atmospheric transport of the low-latitude energy surplus. Model versions that are close to net radiative equilibrium also have ocean heat transport and MOC close to observed values.

Beneš, Libor, Rudolf Kaloč e Luboš Minář. "NEW APPROACH TO THE ANALYSIS OF THE CONTACT SURFACES OF ROLLING KINEMATIC COUPLE". TRANSPORT 25, n. 4 (31 dicembre 2010): 382–86. http://dx.doi.org/10.3846/transport.2010.47.

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All physical processes of contact phenomenon especially a slip mechanism occur in the superficial layers related to changes in the micro/macro‐geometry of the surface. It is also the area where thermo‐mechanical processes of non‐isothermal nature arise. The persistent problems of damage to contact surfaces when being dynamically strained may only be gradually resolved using up‐to‐date metallographic methods, i.e. an experimental analysis of samples taken from the contact‐stressed areas. This paper deals with a new theoretical approach to the loading analysis of contact surfaces during rolling and gives basic information about the study on the influence of dynamical loading in the contact area with the possible occurrence of wave effects in contact with the adhesion drive of a rail vehicle (as an example). The experimental part is based on laboratory testing applying a new‐type designed device.

Guo, Lirong, Kaiyun Wang, Zaigang Chen, Zhiyong Shi, Kaikai Lv e Rui Zhang. "EFFECT OF LATERAL STIFFNESS OF SECONDARY SUSPENSIONS ON HEAVY-HAUL LOCOMOTIVES STABILITY DURING BRAKING BASED ON SIMULATION AND EXPERIMENT". Transport 34, n. 5 (21 novembre 2019): 548–58. http://dx.doi.org/10.3846/transport.2019.11509.

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This paper aimed to investigate the effect of the lateral stiffness of secondary suspensions on the stability capacity and running safety of heavy-haul locomotives during braking based on the dynamic model and the field braking tests. The dynamic model of heavy-haul locomotives included two double-unit locomotives and five coupler systems. Simulation results indicate that the increasing of the lateral stiffness of secondary suspensions can improve the stability capacity and running safety of heavy-haul locomotives. Then, the field braking experiments were conducted to validate the dynamic model. Comparing the experiment results of different locomotives, the coupler and carbody yaw angles are respectively decreased by 31.8 and 29.5%, which is consistent with the simulation results. It is worthy to be noted that lateral vibration behaviour of the carbody increases with the increasing of the lateral stiffness of secondary suspensions. For the improved locomotive, the main frequency of lateral acceleration is 1…2 Hz. However, the main frequency of lateral acceleration is 0.5…1 Hz in the original locomotive tests. Moreover, the high-frequency vibration is increased, especially in 10…12.5 Hz. According to the simulation and experiment results, the reasonable lateral stiffness of secondary suspensions is 400 kN/m for the test locomotive.

Li, Li, Dong Zhang, Xiao-Yun Cheng, Ping Wang e Gui-Ping Wang. "A COMPOSITIONAL APPROACH FOR TRAFFIC DISTRIBUTION EVALUATION OF TRIPLE LEFT-TURN LANES FROM AN INDIVIDUAL PERSPECTIVE". Transport 36, n. 2 (4 maggio 2021): 110–22. http://dx.doi.org/10.3846/transport.2021.14676.

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This study analysed unbalanced traffic distribution on Triple Left-Turn Lanes (TLTLs) at signalized intersections that is caused by left-turn drivers’ unequal lane preferences. To develop statistical bonding between the multilane traffic flow and individual lane choices, the lane volumes are formatted as compositional data to subject the sum-constant constraint. One-way and two-way Compositional ANalysis Of VAriance (CANOVA) models were formulated respectively to estimate the independent effect of one factor and its joint effects with other factors on the multilane traffic distribution. TLTL volume composition was the dependent variable of the models, while the factors of geometric design and traffic control that could affect left-turn drivers’ lane choice were the independent variables. Results indicate that variance of vehicle turning curve, length of the upstream segment, the location of triple left-turn sign, signal phase / cycle length, could affect the traffic distribution, and its balance could be achieved at specific levels of a factor. The joint effects of some factor couples could improve the unbalanced traffic distribution while others could not work.

Merryfield, William J., e George J. Boer. "Variability of Upper Pacific Ocean Overturning in a Coupled Climate Model". Journal of Climate 18, n. 5 (1 marzo 2005): 666–83. http://dx.doi.org/10.1175/jcli-3282.1.

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Abstract Variability of subtropical cell (STC) overturning in the upper Pacific Ocean is examined in a coupled climate model in light of large observed changes in STC transport. In a 1000-yr control run, modeled STC variations are smaller than observed, but correlate in a similar way with low-frequency ENSO-like variability. In model runs that include anthropogenically forced climate change, STC pycnocline transports decrease progressively under the influence of global warming, attaining reductions of 8% by 2000 and 46% by 2100. Although the former reduction is insufficient to fully account for the apparent observed decline in STC transport over recent decades, it does suggest that global warming may have contributed to the observed changes. Analysis of coupled model results shows that STC transports play a significant role in modulating tropical Pacific Ocean heat content, and that such changes are dominated by anomalous currents advecting mean temperature, rather than by advection of temperature anomalies by mean currents.

Più fonti

Tesi sul tema "Transports couplés":

Bouyssier, Julien. "Transports couplés en géométries complexes". Toulouse 3, 2012. http://thesesups.ups-tlse.fr/1929/.

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Ces travaux s'intéressent aux questions de transports non stationnaires et de transferts stationnaires de chaleur et de masse par convection-diffusion au sein de géométries complexes. Par complexe, nous entendons d'une part pour le transport que le fluide est convecté au sein d'une cavité de section quelconque lentement variable dans la direction longitudinale, c'est à dire ayant des variations longitudinales grandes devant hauteur et largeur moyennes. Nous considérons d'autre part le transfert au sein de domaines non-axisymétriques dans lesquels sont plongés un ou plusieurs tubes où le fluide porteur s'écoule. Pour ce qui concerne le transfert, ce travail a consisté à montrer comment étendre le principe, valider l'utilisation, et illustrer l'efficacité d'une décomposition en mode de Graetz pour la prédiction des échanges dans des configurations réalistes d'échangeurs. Cette décomposition permet de formuler le problème initial 3D comme un problème aux valeurs propres généralisées en 2D dont la résolution numérique est drastiquement moins coûteuse. Nous généralisons la notion de mode de Graetz à des conditions aux limites latérales quelconques et, en particulier pour le cas d'échangeurs équilibrés où nous avons mis en évidence un nouveau mode linéairement variables dans la direction longitudinale. Nous mettons en oeuvre le calcul de ces modes de Graetz dans le cas de configurations semi-infinies pour traiter, par exemple, des configurations transversalement périodiques (types plancher chauffant) et montrons qu'un faible nombre de modes suffit pour donner une très bonne approximation des transferts. Dans le cas d'échangeurs finis couplé avec des tubes en entrée/sortie, nous montrons comment déterminer les amplitudes des modes de Graetz dans les différents domaines par la minimisation d'une fonctionnelle associée aux conditions d'entrée sorties retenues. Ces modes permettent l'étude paramétrique systématique des champs de température, des flux de chaleurs entre les domaines fluides et solides ainsi que des rendements thermiques d'un échangeur à deux tubes. Nos résultats indiquent que la longueur d'échange caractéristique est gouvernée par le premier mode de Graetz généralisé à grand nombre de Péclet. Nous montrons aussi, en particulier, qu'un échangeur symétrique possède un spectre symétrique, et une évolution amont/aval symétrique. Dans le cas de la dispersion de Taylor, nous avons établi une forme conservative 3D des équations de dispersion de Taylor en géométrie variable généralisant le cas 2D déjà connu. Nous avons ensuite implémenté en éléments finis puis validé numériquement ces équations de dispersion en 2D et 3D. Nous montrons que les variations longitudinales 3D de la cavité peuvent considérablement augmenter la dispersion longitudinale
This 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.

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Numbonui, 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.

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Nous avons entrepris d'illustrer le transport-réaction non isotherme par des exemples étudiés précédemment au laboratoire en conditions isothermes : le transport facilité de l'acide borique par l'ion borate à travers une membrane échangeuse d'anions et le transport facilité du dioxyde de carbone par l'éthylènediamine monoprotonée à travers une membrane échangeuse de cations. Ces deux exemples mettent en jeu respectivement la formation des polyborates et d'un complexe carbamique dont les stabilités diminuent avec la température. L'étude expérimentale détaillée de ces deux systèmes est suivie d'une approche théorique utilisant des modèles de la littérature. Nous avons ainsi pu évaluer les coefficients phénoménologiques reliant le flux non-isotherme au gradient de potentiel chimique du perméant et au gradient de température. Nous avons aussi pu prévoir quantitativement les flux observés expérimentalement en étendant aux cas non-isothermes le modèle de transport-réaction développé jusqu'ici au laboratoire pour traiter du transport-réaction isotherme d'espèces neutres dans les membranes ioniques. Enfin les calculs et travaux préliminaires ouvrent la voie à des nouvelles investigations sur le transport actif thermique

Rodriguez, 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.

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L'objet de ce travail est l'étude de la physique des transferts prenant place lors du séchage solaire d'un produit emballé par un film polymère particulier; celui- ci ne laisse passer que les molécules d'eau, par phénomènes de sorption désorption. L'approche proposée a pour but de fournir au lecteur suffisamment de connaissance de cette physique afin de pouvoir envisager le dimensionnement de tout système de séchage utilisant ce type d'emballage. La démarche employée, après une présentation des principes généraux des séchoirs solaires actuels, est expérimentale et de modélisation. Un modèle à l'échelle du procédé (produit emballé soumis à un rayonnement solaire) est établi, validé et amendé à l'aide d'un système expérimental conçu et réalisé à cet effet (cellule de mesure adaptée placée sous un simulateur solaire); il est ensuite utilisé sous une version simplifiée pour étudier une application choisie pour son utilité (produit étalé sur un support -sol ou réceptacle autre- sur lequel est apposé le film). Ce modèle prévisionnel est adapté au dimensionnement de systèmes utilisant ce type d'emballage, moyennant une estimation préalable des pertes d'énergie non liées à l'évaporation.

Décultot, 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.

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Le procédé Plasma Arc Melting Cold Hearth Refining (PAMCHR) permet de recycler des chutes de titane afin d’élaborer des alliages de titane de qualité aéronautique. Les travaux de thèse présentés dans ce manuscrit se concentrent sur l’étape d’affinage du procédé. Elle correspond, après fusion de la matière et avant coulée en lingotière, au transport du métal liquide dans un creuset à fond plat en cuivre refroidi à l’eau. L’apport de chaleur du procédé se fait par des torches à plasma, dans un environnement de gaz inerte. Une modélisation tridimensionnelle de l’écoulement thermo-hydrodynamique de l’alliage de titane, a été développée avec pour base le logiciel CFD Ansys-Fluent. L’objectif de cet outil, nommé PAM3D, est d’améliorer notre compréhension du comportement du titane liquide au sein du creuset d’affinage. Un grand nombre de fonctions ont été intégrées au modèle pour décrire, entre autres, les transferts thermique et dynamique entre le jet de plasma et la surface du bain liquide. La compréhension de ces transferts est primordiale à la modélisation du procédé : ils ont pu être obtenus à l’aide d’une série d’essais, réalisés sur un four pilote PAMCHR, et de simulations obtenues par le développement de deux modèles numériques simples. Des résultats de simulations obtenues par cette première version de PAM3D sont confrontés à des mesures prises à partir de fusions expérimentales, et la comparaison est jugée satisfaisante. Cependant, la valeur maximale implémentée dans le modèle de la contrainte pariétale, dû à l’impact de la torche à la surface du bain, semble être sous-estimée. Des simulations complémentaires mettent d’ailleurs en avant le rôle important des forces hydrodynamiques sur le comportement thermique du bain, et en particulier de cette contrainte pariétale
The 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.

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Dans cette thèse, nous nous sommes intéressés à l'étude à basse température de dispositifs en silicium de taille nanométrique. Dans ces dispositifs, il est possible de faire passer le courant électrique à travers un nombre réduit de dopants. Nous avons étudié plus spécifiquement le cas de deux dopants en séries, dont les potentiels électrostatiques sont contrôlés indépendamment par deux tensions de grille. En régime de transport électronique statique, il est possible d'effectuer une spectroscopie des niveaux électronique des dopants. On mesure la séparation des deux premiers états de dopants phosphore, qui est proche de 10 meV, alors qu'elle est de 11,7 meV pour des dopants dilués dans un cristal massif. Cette différence s'explique par la proximité des dopants avec une interface avec de l'oxyde de silicium. En régime dynamique, lorsque les niveaux des dopants sont modulés par un signal périodique, on observe qu'un courant est généré par le dispositif. L'évolution du courant en fonction des tensions de grille est simulée en prenant en compte les couplages tunnels du système. À haute fréquence, lorsque l'on observe la quantification d'énergie électromagnétique échangée avec le système, on reproduit le courant mesuré en fonction de l'amplitude du signal appliqué sur les grilles. Cette mesure permet de mettre en évidence la cohérence d'un électron partagé sur deux dopants.

Raturi, 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.

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NorM multidrug transport proteins belong to the multiple antibiotics and toxins extrusion (MATE) family of secondary active transporters. Members of this family are present across all species including bacteria, plants and humans. In bacteria, their over-expression can lead to antibiotic resistance, whereas in the human body, the transporters can alter the plasma levels of drugs. NorM proteins are therefore relevant for the pharmacokinetic properties of drugs. Previously, NorM from Vibrio cholerae (NorM-VC) was shown to export drug (ethidium) in an antiport reaction that is coupled to the simultaneous uptake of protons and sodium ions down their electrochemical gradients across the plasma membrane. But NorM from Pseudomonas stutzeri (NorM-PS) was shown to transport DAPI by utilising proton cycling exclusively. NorM-VC and NorM-PS share 42% identical amino-acid residues and yet their functions differ in terms of their ion coupling properties. These differences in functionality of two highly homologous proteins provide an excellent opportunity to carry out a comparative study. The work presented in this thesis investigates the energetics of drug transport processes by NorM-VC and NorM-PS and the structural basis for ion-coupled drug transport by NorM-VC. Ethidium efflux assays in intact Lactococcus lactis cells were used to study the effect of the magnitude and composition of the proton- and sodium-motive force on transport activity. Furthermore, ethidium binding assays were used to study partial reactions in drug efflux processes. These biochemical data were supplemented by computational studies and analyses of current protein structures. Based on the observations detailed here, a novel transport model for NorM-VC is proposed, which explains published findings for NorM-VC and other MATE transporters. The model represents a potentially universal mechanism for MATE transporters that can be used to predict further structure-function relationships in this important family of member transporters.

Amir, 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.

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Cette thèse porte sur la simulation numérique de modèles couplés pour l'écoulement et le transport dans les milieux poreux. Nous présentons une nouvelle méthode de couplage entre les réactions chimiques et le transport en utilisant une méthode de Newton-Krylov, et nous étudions également un modèle d'écoulement en milieu fracturé qui traite l'intersection des fractures par une méthode de décomposition de domaine.
Ce 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.

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Cette thèse porte sur la modélisation numérique pour l'écoulement et le transport dans les milieux poreux. Nous présentons une nouvelle méthode de couplage entre les réations chimiques et le transport en utilisant une méthode de Newton-Krylov, et nous étudions un modèle d'écoulement qui traite l'intersection des fractures par une méthode de décomposition de domaine. Ce travail est divisé en trois parties: la première partie est une analyse de différents schémas numériques pour la discrétisation du problème d'advection-diffusion, notament 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 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 tridimentionnel, basée sur une méhode de décomposition de domaine, et qui traite l'intersection des fracures. Nous démontrons l'existence et l'unicité de la solution, et nous validons le modèle par des tests numériques
This 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.

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L’objectif de cette thèse était la modélisation numérique de la torche à plasma à couplage inductive. (ICP). Nous avons établi les bases de données nécessaires : composition, propriétés thermodynamiques et de transport appliqués aux mélanges d’argon, d’acide nitrique et d’eau. Le modèle hydrodynamique de la torche ICP (7 spires) considère le plasma à l'équilibre thermodynamique et couple les équations de Navier-Stokes pour décrire l'écoulement du plasma aux équations de Maxwell pour décrire l'évolution du champ électrique et du champ magnétique
The 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

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Libri sul tema "Transports couplés":

Poyner, David. G Protein Coupled Receptors: Essential Methods. Chichester: John Wiley & Sons, 2010.

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David, Poyner, e Wheatley Mark, a cura di. G-protein coupled receptors: Methods express. Chichester, West Sussex, UK: John Wiley & Sons, 2009.

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David, Poyner, e Wheatley Mark, a cura di. G-protein coupled receptors: Methods express. Chichester, West Sussex, UK: John Wiley & Sons, 2009.

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Pavlov, G. A. Transport processes in plasmas with strong coulomb interaction. Amsterdam, The Netherlands: Gordon and Breach Science Publishers, 2000.

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Leonard, Jason. Exciton Transport Phenomena in GaAs Coupled Quantum Wells. Cham: Springer International Publishing, 2018. http://dx.doi.org/10.1007/978-3-319-69733-8.

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International Symposium on 25 Years of Research on the Brush Border Membrane and Sodium-Coupled Transport (1985 Aussois, France). Ion gradient-coupled transport: Proceedings of the International Symposium on 25 Years of Research on the Brush Border Membrane and Sodium-Coupled Transport held in Aussois (France), 18-20 September 1985. A cura di Alvarado Francisco, Os Carel H. van, Institut national de la santé et de la recherche médicale (France). e Centre national de la recherche scientifique (France). Amsterdam: Elsevier Science Publishers, 1986.

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L, Boersma, e Oregon State University. Agricultural Experiment Station., a cura di. Model of coupled transport of water and solutes in plants. Corvallis, Or: Agricultural Experiment Station, Oregon State University, 1988.

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Ishizuka, Hiroaki. Magnetism and Transport Phenomena in Spin-Charge Coupled Systems on Frustrated Lattices. Tokyo: Springer Japan, 2015. http://dx.doi.org/10.1007/978-4-431-55663-3.

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Barghouty, A. F. Coupled particle transport and pattern formation in a nonlinear leaky-box model. Huntsville], Ala: National Aeronautics and Space Administration, Marshall Space Flight Center, 2009.

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Pavlov, G. A. Prot͡sessy perenosa v plazme s silʹnym kulonovskim vzaimodeĭstviem. Moskva: Ėnergoatomizdat, 1995.

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Capitoli di libri sul tema "Transports couplés":

Holzbecher, Ekkehard, e Ahmed Hadidi. "Sediment Transport in Shallow Waters as a Multiphysics Approach". In Natural Disaster Science and Mitigation Engineering: DPRI reports, 423–37. Singapore: Springer Singapore, 2021. http://dx.doi.org/10.1007/978-981-16-2904-4_16.

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AbstractSuspended particle and bed-load transport are usually high during flooding events. For that reason, sediment transport is an important feature to be taken into account when studying floods. Measures that aim to mitigate the negative impacts of floods depend on such studies. Sediment transport phenomena are complex due to their coupling behavior with fluid flow. Due to the erosion and sedimentation of particulate matter, the ground surface changes during the passing of a flood. The courses of unregulated rivers and wadis after floods are different than those before floods. Flowing water transports sediments, and vice versa; sediment redistribution affects the flow of water due to changes in the ground surface and other factors. Computer simulations of sediment transport must take the coupling between water flow and transport processes into account. Here, a multiphysics approach in such a coupled model is presented. Shallow water equations (SWE) representing water height and velocity are coupled with equations for suspended particulate matter and bed loads. Using COMSOL Multiphysics software, an implementation is presented that demonstrates the capability and feasibility of the proposed approach. The approach is applied to the problems of scouring and sedimentation at obstacles, which are particularly important for ensuring the stability of bridges across rivers and wadis.

Fuchs, Hans U. "Conduction and Coupled Transports". In Graduate Texts in Physics, 535–66. New York, NY: Springer New York, 2010. http://dx.doi.org/10.1007/978-1-4419-7604-8_14.

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Kanner, Baruch I. "Sodium-Coupled GABA and Glutamate Transporters". In Neurotransmitter Transporters, 151–69. Totowa, NJ: Humana Press, 1997. http://dx.doi.org/10.1007/978-1-59259-470-2_5.

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Berkovits, Richard. "Transport Through Low Density Quantum Dots". In Strongly Coupled Coulomb Systems, 493–96. Boston, MA: Springer US, 2002. http://dx.doi.org/10.1007/0-306-47086-1_89.

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Pavlov, G. A. "Effective Transport Coefficients in Low Temperature Multicomponent Plasma". In Strongly Coupled Coulomb Systems, 695–97. Boston, MA: Springer US, 2002. http://dx.doi.org/10.1007/0-306-47086-1_131.

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Röpke, Gerd. "Dielectric Function and Transport Coefficients in Strongly Coupled Plasmas". In Strongly Coupled Coulomb Systems, 679–82. Boston, MA: Springer US, 2002. http://dx.doi.org/10.1007/0-306-47086-1_127.

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Sharp, Barry L., e Ciaran O'Connor. "Aerosol Generation and Sample Transport". In Inductively Coupled Plasma Spectrometry and its Applications, 98–133. Oxford, UK: Blackwell Publishing Ltd, 2007. http://dx.doi.org/10.1002/9780470988794.ch4.

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Ichimaru, Setsuo, Hiroshi Iyetomi e Shigenori Tanaka. "Thermodynamic Functions, Transport Coefficients and Dynamic Correlations in Dense Plasmas". In Strongly Coupled Plasma Physics, 3–18. Boston, MA: Springer US, 1987. http://dx.doi.org/10.1007/978-1-4613-1891-0_1.

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Itoh, Naoki. "Transport Processes and Neutrino Emission Processes in Dense Astrophysical Plasmas". In Strongly Coupled Plasma Physics, 151–59. Boston, MA: Springer US, 1987. http://dx.doi.org/10.1007/978-1-4613-1891-0_15.

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Leonard, Jason. "Observation of Exciton Spin Transport". In Exciton Transport Phenomena in GaAs Coupled Quantum Wells, 47–59. Cham: Springer International Publishing, 2017. http://dx.doi.org/10.1007/978-3-319-69733-8_5.

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Atti di convegni sul tema "Transports couplés":

Cuppoletti, John. "Composite Synthetic Membranes Containing Native and Engineered Transport Proteins". In ASME 2008 Conference on Smart Materials, Adaptive Structures and Intelligent Systems. ASMEDC, 2008. http://dx.doi.org/10.1115/smasis2008-449.

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Our membrane transport protein laboratory has worked with material scientists, computational chemists and electrical and mechanical engineers to design bioactuators and sensing devices. The group has demonstrated that it is possible to produce materials composed native and engineered biological transport proteins in a variety of synthetic porous and solid materials. Biological transport proteins found in nature include pumps, which use energy to produce gradients of solutes, ion channels, which dissipate ion gradients, and a variety of carriers which can either transport substances down gradients or couple the uphill movement of substances to the dissipation of gradients. More than one type of protein can be reconstituted into the membranes to allow coupling of processes such as forming concentration gradients with ion pumps and dissipating them with an ion channel. Similarly, ion pumps can provide ion gradients to allow the co-transport of another substance. These systems are relevant to bioactuation. An example of a bioactuator that has recently been developed in the laboratory was based on a sucrose-proton exchanger coupled to a proton pump driven by ATP. When coupled together, the net reaction across the synthetic membrane was ATP driven sucrose transport across a flexible membrane across a closed space. As sucrose was transported, net flow of water occurred, causing pressure and deformation of the membrane. Transporters are regulated in nature. These proteins are sensitive to voltage, pH, sensitivity to a large variety of ligands and they can be modified to gain or lose these responses. Examples of sensors include ligand gated ion channels reconstituted on solid and permeable supports. Such sensors have value as high throughput screening devices for drug screening. Other sensors that have been developed in the laboratory include sensors for membrane active bacterial products such as the anthrax pore protein. These materials can be self assembled or manufactured by simple techniques, allowing the components to be stored in a stable form for years before (self) assembly on demand. The components can be modified at the atomic level, and are composed of nanostructures. Ranges of sizes of structures using these components range from the microscopic to macroscopic scale. The transport proteins can be obtained from natural sources or can be produced by recombinant methods from the genomes of all kingdoms including archea, bacteria and eukaryotes. For example, the laboratory is currently studying an ion channel from a thermophile from deep sea vents which has a growth optimum of 90 degrees centigrade, and has membrane transport proteins with very high temperature stability. The transport proteins can also be genetically modified to produce new properties such as activation by different ligands or transport of new substances such as therapeutic agents. The structures of many of these proteins are known, allowing computational chemists to help understand and predict the transport processes and to guide the engineering of new properties for the transport proteins and the composite membranes. Supported by DARPA and USARMY MURI Award and AFOSR.

Kaufmann, M. V., B. R. Simon e A. L. Baldwin. "Arterial Wall Transport Simulation: Porohyperelastic/Transport Finite Element Models". In ASME 1996 International Mechanical Engineering Congress and Exposition. American Society of Mechanical Engineers, 1996. http://dx.doi.org/10.1115/imece1996-1250.

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Abstract Porohyperelastic transport-swelling (PHETS) models (Kaufmann [1996], Simon et al [1995]) for soft tissues have been developed and applied to problems of transport within the walls of large arteries. The general theory developed in [Kaufmann, 1996] includes mass transport by diffusion and convection, the influence of electrical and chemical potentials, and osmotic swelling, as well as the characteristic nonlinear finite deformation of the tissue. The models couple the behavior of the porous solid skeleton, mobile tissue fluid and concentrations of charged species. This abstract presents a finite element model (FEM) of the convection-diffusion of an uncharged single species through a rabbit aorta under various intraluminal pressures. The results of these models show good qualitative agreement with experimental results. The general PHETS theory coupled with the FEM implementation of the theory could provide insight into the transport associated with causal factors of atherosclerosis. The models can be used to study the effectiveness of various drug delivery systems.

Yanagita, Tatsuo. "COUPLED MAP LATTICE MODEL FOR BOILING". In International Symposium on Imaging in Transport Processes. Connecticut: Begellhouse, 1992. http://dx.doi.org/10.1615/ichmt.1992.intsympimgtranspproc.350.

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Loy, James M., Ajay Vadakkepatt, Sanjay R. Mathur e Jayathi Y. Murthy. "A Fast Coupled Solver for Phonon Transport in Composites". In ASME 2013 Heat Transfer Summer Conference collocated with the ASME 2013 7th International Conference on Energy Sustainability and the ASME 2013 11th International Conference on Fuel Cell Science, Engineering and Technology. American Society of Mechanical Engineers, 2013. http://dx.doi.org/10.1115/ht2013-17302.

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In recent years, computational techniques for solving phonon transport have been developed under the framework of the semiclassical Boltzmann Transport Equation (BTE). Early work addressed gray transport, but more recent work has begun to resolve wave vector and polarization dependence, including that in relaxation times. Because the relaxation time in typical materials of interest spans several orders of magnitude, typical solution techniques must address an enormous range of Knudsen numbers in the same problem. Calculation procedures which solve the BTE in phase space sequentially work well in the ballistic limit, but are slow to converge in the thick limit. Unfortunately, both extremes may be encountered simultaneously in typical wave-number (K) -resolved phonon transport problems. In previous work, we developed the coupled ordinate method (COMET) to address this problem. COMET employs a point-coupled solution to resolve coupling in K-space, and embeds this point solver as a relaxation sweep in a geometric multigrid method to maintain spatial coupling. We have demonstrated speedups of up to 200 over conventional sequential solution procedures using this method. COMET also exhibits excellent scaling on multiprocessor platforms, far beyond those obtained by sequential solvers. In this paper, we extend COMET to address interface transport in composites. Just as scattering couples phonons of different wave vectors in the bulk, reflection and transmission couple different wave vectors together at interfaces. Again, sequential solution procedures perform poorly because of the poor algorithmic coupling in K space. A computational procedure based on COMET is developed for composites, addressing multigrid agglomeration strategies to promote stronger K-space coupling at interfaces. The technique is applied to canonical superlattice geometries and superior performance over typical sequential solvers is demonstrated. Furthermore, the method is applied to realistic particle composites employing computational meshes developed from x-ray computed tomography (CT) scans of particulate beds. It is demonstrated to yield solutions where sequential solution techniques fail to converge at all.

Deutsch, Claude, Hrachya B. Nersisyan, Günter Zwicknagel, Padma K. Shukla, José Tito Mendonça, Bengt Eliasson e David Resedes. "Equilibrium and transport in a strongly coupled and magnetized ultra-cold plasma". In INTERNATIONAL TOPICAL CONFERENCE ON PLASMA SCIENCE: Strongly Coupled Ultra-Cold and Quantum Plasmas. AIP, 2012. http://dx.doi.org/10.1063/1.3679581.

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Scheihing Hitschfeld, Bruno, Govert Nijs e Xiaojun Yao. "Quarkonium transport in strongly coupled plasmas". In 11th International Conference on Hard and Elecctromagnetic Probes of High-Energy Nuclear Collisions. Trieste, Italy: Sissa Medialab, 2024. http://dx.doi.org/10.22323/1.438.0101.

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Kinzel, Edward, Collin Finnan, Chao Dong, David Burghoff, Stephen M. White, Hadrian Aquino, Alexei O. Orlov, Wolfgang Porod, Gary H. Bernstein e Gergo P. Szakmany. "Thermal Transport in Thermoelectric Coupled Nanoantennas". In ASME 2023 Heat Transfer Summer Conference collocated with the ASME 2023 17th International Conference on Energy Sustainability. American Society of Mechanical Engineers, 2023. http://dx.doi.org/10.1115/ht2023-107511.

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Abstract A Thermoelectrically Coupled Nanoantenna (TECNA) consists of a metallic antenna integrated with a thermoelectric junction. In its simplest form, a dipole antenna (∼λ/2 long) lies at the junction of two leads having different Seebeck coefficients. When radiation is absorbed by the antenna, the excited currents produce Joule heating that is transferred to the junction, generating an unbiased open-circuit voltage. Nanofabrication, specifically e-beam lithography, allows conventional microwave engineering to be scaled to mid/long-wave infrared and THz frequencies. The antenna allows the device to be engineered to respond to specific wavelengths and polarizations. At resonance, the effective absorption aperture of the antenna significantly exceeds its very small physical area. The subsequent small thermal mass results in measured bandwidths greater than 100 kHz. Understanding and engineering the thermal transport over nanoscale (50 × 100 × 7000 nm) leads is critical to improving device performance. This paper analyzes the thermal transport for dipole antennas suspended above hemispherical cavities. These cavities are etched into the substrate and provide thermal isolation to the antenna and feed structure, significantly improving the results. A frequency domain solution is driven by finite element analyzed absorption models in the antenna. These simplified models agree well with experiments using a CO2 laser. The modeled results are used to estimate an effective convection coefficient in air at this length scale. They are also analyzed to create design rules, including thermal transport for future devices.

Guo, Peng, Stanley D. Hillyard e Bingmei M. Fu. "Water Flux Coupled to Active Solute Transport Across Amphibian Epidermis". In ASME 2003 Heat Transfer Summer Conference. ASMEDC, 2003. http://dx.doi.org/10.1115/ht2003-47207.

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We examine the water flux across amphibian skin driven by both the osmotic gradient and the active transport. Amphibian skin is modeled as a well-stirred compartment bounded by a mucosal barrier and a serosal barrier. The compartment represents the lateral intercellular space between cells in the stratum granulosum. The mucosal barrier is comprised of a cell barrier and a tight junctional barrier. The cell barrier is hypothesized to have the ability to actively transport solute (Na-K-ATPase) and the solute flux is assumed to satisfy the Machaelis-Menton relationship. Our model shows that: 1) there is a substantial water flux coupled to the active solute flux and this coupled water flux is nearly constant when the osmolality of the apical bathing solution is greater than 100 mOsm despite its variation; 2) the predicted rehydration rates from apical bathing solutions are in good agreement with the experiment results in Hillyard and Larsen [2]; 3) the molar ratio of the actively transported solute flux to the coupled water flux is 1:165, which is almost the same as that reported in Nielsen [5].

Wang, Yun. "Dynamic Characteristics of Polymer Electrolyte Fuel Cell and Hydrogen Tank". In 2010 14th International Heat Transfer Conference. ASMEDC, 2010. http://dx.doi.org/10.1115/ihtc14-23005.

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In this paper, we develop 3D dynamic models for polymer electrolyte fuel cells (PEFCs) and hydrogen tanks, respectively. The PEFC model considers the key components of a single PEFC and couples the various mechanisms that govern fuel cell transient including the electrochemical double-layer behavior, species transport, heat transfer, liquid water dynamics, and membrane water uptake. The hydrogen tank model includes a 3D description of the hydrogen discharging kinetics coupled with mass/heat transport in a LaNi5–based hydrogen tank. Efforts are made to discuss the dynamic characteristics of the PEFC and hydrogen tank together with the possible coupling of the two systems. Local electrochemical and hydride reaction rates, transport processes and associated limiting factors are investigated.

Homison, Chris, e Lisa M. Weiland. "Coupled transport/hyperelastic model for nastic materials". In Smart Structures and Materials, a cura di William D. Armstrong. SPIE, 2006. http://dx.doi.org/10.1117/12.659593.

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Rapporti di organizzazioni sul tema "Transports couplés":

Jacobsen, J. S., e C. L. Carnahan. Coupled transport processes in semipermeable media. Office of Scientific and Technical Information (OSTI), aprile 1990. http://dx.doi.org/10.2172/6400480.

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Carnahan, C. L., e J. S. Jacobsen. Coupled transport processes in semipermeable media. Office of Scientific and Technical Information (OSTI), aprile 1990. http://dx.doi.org/10.2172/6494706.

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Jacobsen, J. S., e C. L. Carnahan. Coupled transport processes in semipermeable media. Office of Scientific and Technical Information (OSTI), marzo 1990. http://dx.doi.org/10.2172/6494710.

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Raiciu, C., M. Handley e D. Wischik. Coupled Congestion Control for Multipath Transport Protocols. RFC Editor, ottobre 2011. http://dx.doi.org/10.17487/rfc6356.

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Ginn, Timothy R., Ellyn M. Murphy, Madilyn M. Fletcher e Jonh H. Cushman. Dynamics of Coupled Microbial and Contaminant Transport. Office of Scientific and Technical Information (OSTI), giugno 2000. http://dx.doi.org/10.2172/827042.

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Swanson, Jessica. CHARACTERIZING COUPLED CHARGE TRANSPORT WITH MULTISCALE MOLECULAR DYNAMICS. Office of Scientific and Technical Information (OSTI), agosto 2011. http://dx.doi.org/10.2172/1164073.

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Lamb, J. D. Novel macrocyclic carriers for proton-coupled liquid membrane transport. Office of Scientific and Technical Information (OSTI), giugno 1991. http://dx.doi.org/10.2172/6110290.

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Lamb, J. D., J. S. Bradshaw e R. M. Izatt. Novel macrocyclic carriers for proton-coupled liquid membrane transport. Office of Scientific and Technical Information (OSTI), luglio 1992. http://dx.doi.org/10.2172/6957516.

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Harff, N. E., J. A. Simmons e S. K. Lyo. Electron transport in coupled double quantum wells and wires. Office of Scientific and Technical Information (OSTI), aprile 1997. http://dx.doi.org/10.2172/477761.

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Hammer, Hans, HyeongKae Park, Luis Chacon, William Taitano, Steven Anderson e Andrei Simakov. Coupled radiation transport and plasma physics for ICF simulations. Office of Scientific and Technical Information (OSTI), settembre 2021. http://dx.doi.org/10.2172/1820071.

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