Дисертації з теми "Confinement mechanism"
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Dix, James. "Understanding the mechanism of permeation through graphene-based membranes using molecular dynamics simulations." Thesis, University of Manchester, 2017. https://www.research.manchester.ac.uk/portal/en/theses/understanding-the-mechanism-of-permeation-through-graphenebased-membranes-using-molecular-dynamics-simulations(68f5ea06-3ba5-4b2c-91e9-18b57bb2b6d7).html.
Повний текст джерелаShrestha, Pooja. "Mechanism of substrate protein remodeling by molecular chaperones." University of Cincinnati / OhioLINK, 2013. http://rave.ohiolink.edu/etdc/view?acc_num=ucin1378113185.
Повний текст джерелаMüller, Martin Verfasser], Jörg [Akademischer Betreuer] [Kröger, Stefan [Gutachter] Krischok, and Simon [Gutachter] Crampin. "Single-atom junctions and novel electron confinement mechanism on Pb(111) / Martin Müller ; Gutachter: Stefan Krischok, Simon Crampin ; Betreuer: Jörg Kröger." Ilmenau : TU Ilmenau, 2017. http://d-nb.info/117814156X/34.
Повний текст джерелаMüller, Martin [Verfasser], Jörg [Akademischer Betreuer] Kröger, Stefan [Gutachter] Krischok, and Simon [Gutachter] Crampin. "Single-atom junctions and novel electron confinement mechanism on Pb(111) / Martin Müller ; Gutachter: Stefan Krischok, Simon Crampin ; Betreuer: Jörg Kröger." Ilmenau : TU Ilmenau, 2017. http://d-nb.info/117814156X/34.
Повний текст джерелаTsegaye, Takele Dessie. "Confinement Mechanisms in Quantum Chromodynamics." University of Cincinnati / OhioLINK, 2003. http://rave.ohiolink.edu/etdc/view?acc_num=ucin1051373650.
Повний текст джерелаTakele, Tsegaye. "Confinement mechanisms in quantum cherodynamics." Cincinnati, Ohio : University of Cincinnati, 2002. http://rave.ohiolink.edu/etdc/view?acc%5Fnum=ucin1051373650.
Повний текст джерелаKadri, Abdelaziz. "Etude electrochimique des processus de corrosion d'un alliage fe-36 ni sous des couches minces d'elecrolyte, a l'air libre ou en situation de confinement." Paris 6, 1986. http://www.theses.fr/1986PA066211.
Повний текст джерелаDangla, Rémi. "Microfluidique de gouttes 2D par gradient de confinement." Phd thesis, Ecole Polytechnique X, 2012. http://tel.archives-ouvertes.fr/tel-00835536.
Повний текст джерелаHusowitz, Barry Charles. "Effect of Confinement and Heterogeneity on Phase Behavior: A Density Functional Approach." Diss., The University of Arizona, 2007. http://hdl.handle.net/10150/196124.
Повний текст джерелаHabibzadeh, Pouya. "Small Scale Plasticity With Confinement and Interfacial Effects." Doctoral thesis, Universite Libre de Bruxelles, 2016. http://hdl.handle.net/2013/ULB-DIPOT:oai:dipot.ulb.ac.be:2013/226220.
Повний текст джерелаDoctorat en Sciences de l'ingénieur et technologie
info:eu-repo/semantics/nonPublished
Sarva, Sai Sushilkumar. "Dynamic failure mechanisms in armor grade ceramics : the effect of lateral confinement and membrane restraint /." Diss., Connect to a 24 p. preview or request complete full text in PDF format. Access restricted to UC campuses, 2003. http://wwwlib.umi.com/cr/ucsd/fullcit?p3104047.
Повний текст джерелаDavid, Martin. "Approche multi-échelle du comportement mécanique des structures en béton armé - Application aux enceintes de confinement des centrales nucléaires." Phd thesis, Ecole Polytechnique X, 2012. http://pastel.archives-ouvertes.fr/pastel-00765705.
Повний текст джерелаPetrolli, Vanni. "Confinement induced transition between wave-like cellular migration modes." Thesis, Université Grenoble Alpes (ComUE), 2019. http://www.theses.fr/2019GREAY056.
Повний текст джерелаThe ability of organisms to spontaneously generate order relies on the intricate interplay of mechanical and bio-chemical signals. If the general consensus is that chemical signaling governs the behavior of cells, an increasing amount of evidence points towards the impact of mechanical factors into differentiation, proliferation, motility and cancer progression. In this context, several studies recently highlighted the existence of long-range mechanical excitations (i.e. waves) at the supra-cellular level.Here, we investigate the origins of those velocity waves in tissues and their correlation with the presence of boundaries. Practically, we confine epithelial cell mono-layers to quasi-one dimensional geometries, to force the almost ubiquitous establishment of tissue-level waves. By tuning the length of the tissues, we uncover the existence of a phase transition between global and multi-nodal oscillations, and prove that in the latter regime, wavelength and period are independent of the confinement length. Together, these results demonstrate the intrinsic origin of tissue oscillations, which could provide cells with a mechanism to accurately measure distances at the supra-cellular level and ultimately lead to spatial patterning. Numerical simulations based on a Self-propelled Voronoi model reproduce the phase transition we measured experimentally and help in guiding our preliminary investigations on the origin of these wave-like phenomena, and their potential role for the spontaneous appearance of hair follicles in mouse skin explants
Thiam, Hawa-Racine. "Cell migration under confinement : how can a cell squeeze through narrow gaps ?" Thesis, Paris 5, 2014. http://www.theses.fr/2014PA05T048/document.
Повний текст джерелаCell migration has two opposite faces; necessary for many physiological processes such as immune response, it can also lead to the organism death by allowing metastatic cells to invade new organs. In vivo migration often occurs in complex 3D environments which impose high cellular deformability. Recently, cellular deformability during 3D migration has been shown to be limited by the nucleus (Wolf et al. JCB, 2013). For instance, cell migration can be increased by decreasing nuclear stiffness. However, below a given nuclear stiffness 3D cell migration can be reduced as a result of impaired cell survival (Harada et al. JCB, 2014). Cancer cells which display slow migration and have rather stiff nuclei have been shown to overcome the physical limits of 3D migration through adhesion combined to matrix degradation or high actomyosin contraction (Wolf et al. JCB, 2013). Immune cells such as neutrophils which are fast moving cells with soft nuclei have been reported to die at sites of infection. Interestingly, dendritic cells function as antigen presenting cells requires high migratory ability as well as high survival. They thus constitute an interesting model for studying nuclear deformation in fast moving and long lived cells. During my PhD, I studied the mechanism by which dendritic cells deform their nuclei to achieve proper migration in highly confining space while preserving a high survival rate. I used an original micro fabricated experimental set up (Heuzé et al. MMB, 2011) consisting of microchannels with constrictions to mimic cellular transmigration. Those channels combined with genetic manipulation and live cell imaging followed by image processing were used to assess the mechanism dendritic cells use to deform their nucleus, which we found to be specific and not required for cell motility per se. I showed that dendritic cells overcome the physical limitation imposed by nuclear deformation through small gaps by nucleating an Arp2/3 based actin network around the nucleus. Surprisingly, the formation of this actin network is independent of myosin II based contraction. This actin accumulation around the nucleus co-localized with sites of nuclear Lamin A/C breakage. Moreover, Lamin A/C depletion in dendritic cells leads to the disappearance of this actin ring and the release of the need for Arp2/3 for nuclear deformation. We thus propose a new mechanism of nuclear squeezing through narrow gaps based on an Arp2/3 nucleated actin meshwork which, by transiently breaking the Lamin A/C network, releases the nuclear surface tension and allows nuclear thus cell passage through micrometric constrictions. Lamin A/C repolymerization around the nucleus at the exit of constrictions would then restore nuclear stiffness, allowing cell survival. Interestingly, this actin accumulation around the nucleus was also observed in vivo in migrating macrophages but not in HL-60 derived neutrophils. Taken together, our data suggest that the Arp2/3 based nuclear squeezing mechanism would be a general feature of highly migratory cells which need to survive long enough to accomplish their functions
Dastugue, Laurent. "Contributions à l'étude de la stabilité d'écoulements autosemblables d'onde thermique pour la fusion par confinement inertiel." Phd thesis, Université Pierre et Marie Curie - Paris VI, 2013. http://tel.archives-ouvertes.fr/tel-00975215.
Повний текст джерелаEchegaray, Oviedo Javier Andrés. "Upgrading the push-off test to analyze the contribution of steel fiber on shear transfer mechanisms." Doctoral thesis, Universitat Politècnica de València, 2014. http://hdl.handle.net/10251/43723.
Повний текст джерелаEchegaray Oviedo, JA. (2014). Upgrading the push-off test to analyze the contribution of steel fiber on shear transfer mechanisms [Tesis doctoral no publicada]. Universitat Politècnica de València. https://doi.org/10.4995/Thesis/10251/43723
TESIS
Vu, Xuan Dung. "Vulnérabilité des dalles en béton sous impact : caractérisation, modélisation et validation." Thesis, Grenoble, 2013. http://www.theses.fr/2013GRENI028/document.
Повний текст джерелаConcrete is a material whose behavior is complex, especially in cases of extreme loads. The objective of this thesis is to carry out an experimental characterization of the behavior of concrete under impact-generated stresses (confined compression and dynamic traction) and to develop a robust numerical tool to reliably model this behavior. In the experimental part, we have studied concrete samples from the VTT center (Technical Research Center of Finland). At first, quasi-static triaxial compressions with the confinement varies from 0 MPa (unconfined compression test) to 600 MPa were realized. The stiffness of the concrete increases with confinement pressure because of the reduction of porosity. Therefore, the maximum shear strength of the concrete is increased. The presence of water plays an important role when the degree of saturation is high and the concrete is subjected to high confinement pressure. Beyond a certain level of confinement pressure, the maximum shear strength of concrete decreases with increasing water content. The effect of water also influences the volumic behavior of concrete. When all free pores are closed as a result of compaction, the low compressibility of the water prevents the deformation of the concrete, whereby the wet concrete is less deformed than the dry concrete for the same mean stress. The second part of the experimental program concerns dynamic tensile tests at different loading velocities, and different moisture conditions of concrete. The results show that the tensile strength of concrete C50 may increase up to 5 times compared to its static strength for a strain rate of about 100 s-1. In the numerical part, we are interested in improving an existing constitutive coupled model of concrete behavior called PRM (Pontiroli-Rouquand-Mazars) to predict the concrete behavior under impact. This model is based on a coupling between a damage model which is able to describe the degradation mechanisms and cracking of the concrete at weak confinement pressure and a plasticity model which allows to reproduce the concrete behavior under strong confinement pressure. The identification of the model was done using the results of experimental tests. The improvement of this model, especially the plasticity part, focuses on three main points : taking into account the effect of the deviatoric stress in the calculation of the mean stress; better accounting for the effect of water using poromechanical law instead of mixing law, improvement of the coupling variable between the damage model and the elastoplastic model with consideration of the Lode angle. These improvements were then validated by comparing numerical results and impact tests. The improved model is capable of reproducing the behavior of concrete under different loading paths and at different levels of confinement pressure while taking into account the degree of saturation of concrete
Zhang, Kaiyi. "CO2 Minimum Miscibility Pressure and Recovery Mechanisms in Heterogeneous Low Permeability Reservoirs." Thesis, Virginia Tech, 2019. http://hdl.handle.net/10919/93728.
Повний текст джерелаMaster of Science
The new technologies to recover unconventional resources in oil and gas industry, such as fracturing and horizontal drilling, boosted the production of shale gas and tight oil in 21st century and contributed to the North America oil and gas production. Although the new technologies and strong demand spiked the production of tight oil resources, there are still unknowns of oil and gas flow mechanisms in tight rock reservoirs. As we know, the oil and gas resources are stored in the pores of reservoir formation rock. During production process, the oil and gas are pushed into production wells by formation pressure. However, the pore radius of shale rock is extremely small (around nanometers), which reduces the flow rate of oil and gas and raises capillary pressure in pores. The high capillary pressure will alter the oil and gas phase behavior and it may influence the value of minimum miscibility pressure (MMP), which is an important design parameter for CO2 injection (an important technology to raise production). To investigate this influence, we changed classical model with considering capillary pressure and this modified model is implemented in different methods to calculate MMP. The results show that CO2 -MMP in shale reservoirs are affected by capillary pressure and the results from different methods match well. Moreover, in tight rock reservoirs, the heterogeneous pore size distribution, such as fractures in reservoirs, may affect the flow of oil and gas and MMP value. So, this work also investigates the effect of pore size heterogeneity on oil and gas flow mechanisms. According to the simulation results, compositional gradient forms in heterogeneous nanopores of tight reservoirs and this gradient will cause diffusion which will dominate the other fluid flow mechanisms. Therefore, we always need to consider molecular diffusion in the simulation model for shale reservoirs.
Vu, Xuan Hong. "Caractérisation expérimentale du béton sous fort confinement : influences du degré de saturation et du rapport eau/ciment." Phd thesis, Université Joseph Fourier (Grenoble), 2007. http://tel.archives-ouvertes.fr/tel-00304343.
Повний текст джерелаL'analyse des essais triaxiaux effectués sur le béton de référence montre que le degré de saturation du béton a une influence majeure sur son comportement statique sous fort confinement. Cette influence se remarque particulièrement sur la capacité de chargement du béton et sur la forme de la courbe des états limites pour des degrés de saturation supérieurs à 50%. La capacité de chargement du béton augmente avec la pression de confinement pour des essais sur du béton sec tandis qu'au-delà d'une pression de confinement donnée, elle reste limitée pour du béton humide ou saturé. Les modes de rupture du béton se présentent sous forme de bandes de localisation. L'inclinaison de ces bandes évolue avec le niveau de contrainte atteint dans le matériau et s'oriente perpendiculaire à la direction axiale lorsque ce niveau devient important.
L'analyse des essais triaxiaux réalisés sur les bétons possédant des rapports eau/ciment différents met en évidence que sous faible confinement, le comportement du béton est gouverné par la résistance de la matrice cimentaire. Sous fort confinement, le béton se comporte comme un empilement granulaire sans aucune influence de la résistance de la matrice cimentaire. Ainsi la courbe d'états limites et les modes de rupture du béton sont sensibles à son rapport eau/ciment pour de faibles niveaux de confinement mais insensibles à ce paramètre au-delà une contrainte moyenne critique.
Rojatkar, Prachi. "Numerical Analysis of Multi Swirler Aerodynamics." University of Cincinnati / OhioLINK, 2015. http://rave.ohiolink.edu/etdc/view?acc_num=ucin1448037649.
Повний текст джерелаMachacek, A. C. "Extending the validity range of the linear, fluid description of parametric instabilities in laser produced plasma." Thesis, University of Oxford, 2000. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.326108.
Повний текст джерелаLascar, Celine Claire. "Shock Attenuation in Two-Phase (Gas-Liquid) Jets for Inertial Fusion Applications." Diss., Georgia Institute of Technology, 2007. http://hdl.handle.net/1853/19849.
Повний текст джерелаRojat, Fabrice. "Comportement des tunnels dans les milieux rocheux de faibles caractéristiques mécaniques." Phd thesis, Ecole des Ponts ParisTech, 2010. http://pastel.archives-ouvertes.fr/pastel-00583982.
Повний текст джерелаBaudoin, Camille. "Numerical evaluations of mechanisms governing the heat transport in the edge plasma of tokamaks." Thesis, Aix-Marseille, 2018. http://www.theses.fr/2018AIXM0053/document.
Повний текст джерелаFusion devices are a promising solution for a new source of energy. However, using fusion reaction to produce power within a magnetic confinement is a scientific and technological challenge as it requires a high confinement in the core plasma at the same time as a good control of plasma exhaust on the material walls. This work is motivated by the key problematic of power handling in fusion power plants necessary to avoid damaging the expensive plasma facing components (PFC). The understanding of the physics underlying the heat transport, and more specifically is a critical task for the engineering design of future Tokamak devices. In this context, it is mandatory to make reliable predictions of the power spreading in order to correctly size the future Tokamaks. This calls for a theoretical ground describing the way energy escapes the core plasma through the separatrix and deposits on the PFCs. Some theoretical and experimental studies attempt to achieve such a task, however no definitive conclusion have been drawn yet. To achieve this goal, numerical modelling is a necessary complement to experimental results. This PhD work has been dedicated to the study of the different aspects of the heat transport in the edge plasma using a numerical fluid approach. Special focus was devoted to two types of mechanisms suspected to play an important role in the heat transport: intermittent turbulence; the large-scale convective transport
Mukherjee, Bikramjit. "Interfacial debonding from a sandwiched elastomer layer." Diss., Virginia Tech, 2016. http://hdl.handle.net/10919/71464.
Повний текст джерелаPh. D.
Fradet, Etienne. "Microfluidique de gouttes pour l'étude cinétique de réactions biochimiques." Phd thesis, Ecole Polytechnique X, 2013. http://pastel.archives-ouvertes.fr/pastel-00929715.
Повний текст джерелаAili, Abudushalamu. "Shrinkage and creep of cement-based materials under multiaxial load : poromechanical modeling for application in nuclear industry." Thesis, Paris Est, 2017. http://www.theses.fr/2017PESC1014/document.
Повний текст джерелаThe main interest of the thesis is the long-term mechanical behavior of the containment building of french nuclear power plants. The containment buildings of the power plants are biaxially prestressed concrete structures. Therefore, we summarize the problem of interest into two following key points: biaxiality of load and long-term delayed strain.In order to characterize the delayed strain under biaxial load, our study first concentrates on the viscoelastic Poisson's ratio of concrete. In this purpose, we start by scrutinizing the definition of Poisson's ratio in non-aging linear isotropic viscoelasticity. Then, from the analysis of experimental results from the literature, we can obtain the viscoelastic Poisson's ratio of concrete. As an extension, we use micromechanics to shed some light on the long-term creep mechanism of the C-S-H gel.In a second step, we aim at proposing a poroviscoelastic model without postulating a priori the classical decomposition of delayed strains. We start by identifying the major experimental tendencies and physical phenomena that we aim at capturing with the model. From experimental data of autogenous shrinkage and basic creep from the literature, we analyze the possible physical origin of long-term autogenous shrinkage. In the end, a physics-based poroviscoelastic model is proposed, derived from the poromechanics theory. The prediction of the model is compared with experimental results from literature
Granger, Laurent. "Comportement différé du béton dans les enceintes de centrales nucléaires : analyse et modélisation." Phd thesis, Ecole Nationale des Ponts et Chaussées, 1995. http://tel.archives-ouvertes.fr/tel-00520675.
Повний текст джерелаSenouci, Sidi Mohammed. "Etude et réalisation d'un nouvel appareil d'essais in situ : le géomécamètre." Université Joseph Fourier (Grenoble), 1998. http://www.theses.fr/1998GRE10126.
Повний текст джерелаBachelier, Guillaume. "Propriétés optiques de nano-structures métalliques et semi-conductrices." Phd thesis, Université Paul Sabatier - Toulouse III, 2004. http://tel.archives-ouvertes.fr/tel-00008229.
Повний текст джерелаFen-Chong, Teddy. "Durabilité sous percolation et/ou cristallisation confinée en milieu poreux." Habilitation à diriger des recherches, Université Paris-Est, 2008. http://tel.archives-ouvertes.fr/tel-00287116.
Повний текст джерелаAmitrano, Davide. "Emission acoustique des roches et endommagement : approches experimentale et numerique, application a la sismicite miniere." Grenoble 1, 1999. http://www.theses.fr/1999GRE10002.
Повний текст джерелаHsu, Che-Sheng, and 許哲昇. "Investigation of emission mechanism and environment confinement of Stilbene 3." Thesis, 2012. http://ndltd.ncl.edu.tw/handle/00879336640678213103.
Повний текст джерелаGuo, Hou-Jun, and 郭厚均. "Research of DNA Stretching Mechanism on Lipid Bilayer and Its Behavior Under Confinement." Thesis, 2016. http://ndltd.ncl.edu.tw/handle/40007021649627071092.
Повний текст джерела國立臺灣大學
化學工程學研究所
104
We have recently developed a DNA optical gene mapping platform. The working principle of the platform relies on the phenomenon that DNA can be adsorbed and spontaneously extended along a groove covered with cationic lipid bilayers. The physical gene map can then be readily obtained using nick-translating method. This new platform has great potential because of its low cost and easy operation; however, the reason why DNA can spontaneously extend along the grooves is not clear and it has to be investigated in order to optimize the platform. Since DNA extends only along the grooves, it suggests there exists an electrostatic energy well for DNA. Two possible sources of this well are postulated: (1) the steric effect drives cationic lipids to aggregate on curved surface, (2) the geometry effect allows DNA to interact with more cationic lipids on the curved surface. In order to examine our postulations, we observed DNA behavior on three sets of lipid bilayers (A) DOPC/DOTAP, (B) DOPC/EPC and (C) DOPE/EPC, in which the ratio of the area of the headgroup to that of the tail varies gradually from larger than one to smaller than one. The experimental results show both the streic and the geometry effect exist. However, the geometry effect is always in favor of DNA extension while the steric effect can either enhance or undermine the phenomenon. We have also investigated the effect of the concentration of the positively charged lipids and found higher concentration always help DNA extend. In order to quantify the geometry effect, we have derived the electrostatic potential of DNA on curved surface and found the theoretical prediction is in quantitative agreement with the experimental results. We have also calculated lipid distribution due to steric effect and found that a modest variation of lipid concentration in conjunction with the geometry effect can lead to drastic change on DNA extension. Last but not least, we want to measure the width of the DNA confinement using atomic force microscopy and compare our results with the prediction between DNA extension and the confinement width proposed by de Gennes and Odijk. However, since the lateral diffusion of the lipid bilayer is too fast, we cannot find DNA on lipid bilayer using normal AFM probes. We plan to solve this problem in the future by employing lipids with transition temperatures higher than the room temperature so that lipid bilayer can remain in gel phase during experiments.
Yen, Hui-yen, and 嚴彗嫣. "Investigation of emission mechanism and environment confinement effects of [Ir(ppy)2bpy](PF6) using nonaqueous reverse micelles." Thesis, 2014. http://ndltd.ncl.edu.tw/handle/wfs777.
Повний текст джерелаLiu, Zhaohui. "Mechanistic Investigation into the Conversion of Methanol to Hydrocarbons by Zeolite Catalysts." Diss., 2018. http://hdl.handle.net/10754/628930.
Повний текст джерелаStein-Montalvo, Lucia. "Shape-shifting and instabilities of plates and shells." Thesis, 2021. https://hdl.handle.net/2144/42503.
Повний текст джерела2022-05-06T00:00:00Z
Biswas, Rajib. "Dynamics of Water under Confinement and Studies of Structural Transformation in Complex Systems." Thesis, 2013. http://etd.iisc.ernet.in/2005/3405.
Повний текст джерела(8604438), Philip Morgan Kester. "Hydrothermal synthesis methods to influence active site and crystallite properties of zeolites and consequences for catalytic alkane activation." Thesis, 2020.
Знайти повний текст джерелаHayes, Paul Michael. "Use of a Press-Fit Grip Sleeve for Cable-In-Conduit Superconductor Integration: Effects of Tensile and Fatigue Loading." 2010. http://trace.tennessee.edu/utk_gradthes/806.
Повний текст джерела(5929610), Michael J. Cordon. "Consequences of the Hydrophobicity and Spatial Constraints of Confining Environments in Lewis Acid Zeolites for Aqueous-Phase Glucose Isomerization Catalysis." Thesis, 2019.
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