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Tesi sul tema "Hydrostatic models"

Autore: Grafiati

Pubblicato: 26 ottobre 2024

Ultima modifica: 31 luglio 2025

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1

Ye, Feng. "Derivation of a two-layer non-hydrostatic shallow water model." Thesis, Water Resources Research Center, University of Hawaii at Manoa, 1995. http://hdl.handle.net/10125/21919.

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A theoretical non-hydrostatic model is developed to describe the dynamics of a two-layer shallow water system in the presence of viscous and Coriolis effects. The Navier-Stokes equations are integrated over the water depth in each layer to obtain the layer-mean equations. To close the resulting equation set, perturbation expansions of the vertical momentum equation are used and the dynamic pressures are solved in terms of wave elevations and horizontal velocities. A preliminary analysis is also carried out and a result for the quasigeostrophic problems is given based on an previous study. Our

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2

Zhang, Yuli. "Free wobble/nutation of the earth : a new approach for hydrostatic earth models /." Thesis, National Library of Canada = Bibliothèque nationale du Canada, 1998. http://www.collectionscanada.ca/obj/s4/f2/dsk2/tape17/PQDD_0008/MQ34243.pdf.

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3

League, Richard B. "Bond graph model and computer simulation of a hydrostatic drive test stand." Thesis, Virginia Polytechnic Institute and State University, 1985. http://hdl.handle.net/10919/50042.

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A hydrostatic drive test stand was constructed to aid in the instruction of the characteristics of hydrostatic transmissions and to develop a time-varying load in a shaft to compare torque transducers. A mathematical model of the device was derived using the bond graph approach and was implemented using the Advanced Continuous Simulation Language (ACSL). The test stand was used to obtain experimental data to try to refine the model parameters. To facilitate the measurement of system flows, a microprocessor-based digital flow indicator was developed. Steady-state tests were performed at various

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4

Gonzaga, F. Luis F. "Static pressure drop as affected by moisture and foreign material in rough rice." Thesis, Kansas State University, 1985. http://hdl.handle.net/2097/9843.

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5

Bulian, Gabriele. "DEVELOPMENT OF ANALYTICAL NONLINEAR MODELS FOR PARAMETRIC ROLL AND HYDROSTATIC RESTORING VARIATIONS IN REGULAR AND IRREGULAR WAVES." Doctoral thesis, Università degli studi di Trieste, 2006. http://hdl.handle.net/10077/2518.

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2004/2005<br>Parametrically excited roll motion has become a relevant technical issue, especially in recent years, due the increasing number of accidents related to this phenomenon. For this reason, its study has attracted the interest of researchers, regulatory bodies and classification societies. The objective of this thesis is the developing of nonlinear analytical models able to provide simplified tools for the analysis of parametrically excited roll motion in longitudinal regular and irregular long crested waves. The sought models will take into account the nonlinearities of restoring and

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6

Minář, Petr. "Návrh a optimalizace prostoru hydrostatické kapsy." Master's thesis, Vysoké učení technické v Brně. Fakulta strojního inženýrství, 2011. http://www.nusl.cz/ntk/nusl-229483.

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This diploma thesis deals with an optimization of hydrostatic slide of the large-portal gantry machine FRU (TOS Kuřim). First part of the thesis concerns with an analysis of the current practice in hydrostatic guides in the field of heavy gantry machines, an usage of alternative materials for a construction of carrying parts of machines, and possibilities of current simulation methods. Aim of the second part of this thesis is a brief clarification of the principle of mathematical optimization, and creation of general methodology of construction optimization by means of system analysis. Optimiz

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7

Miller, Adam Charles. "Assessment of Alternate Viscoelastic Contact Models for a Bearing Interface between an Axial Piston Pump Swash Plate and Housing." The Ohio State University, 2014. http://rave.ohiolink.edu/etdc/view?acc_num=osu1403274866.

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8

Carlsson, Erik. "Modeling Hydrostatic Transmission in Forest Vehicle." Thesis, Linköping University, Department of Electrical Engineering, 2006. http://urn.kb.se/resolve?urn=urn:nbn:se:liu:diva-6864.

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<p>Hydrostatic transmission is used in many applications where high torque at low speed is demanded. For this project a forest vehicle is at focus. Komatsu Forest would like to have a model for the pressure in the hose between the hydraulic pump and the hydraulic motor. Pressure peaks can arise when the vehicle changes speed or hit a bump in the road, but if a good model is achieved some control action can be developed to reduce the pressure peaks.</p><p>For simulation purposes a model has been developed in Matlab-Simulink. The aim has been to get the simulated values to agree as well as possi

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9

Marien, Lennart Christopher [Verfasser]. "Towards well-balancing the regional hydrostatic climate model REMO / Lennart Christopher Marien." Hamburg : Staats- und Universitätsbibliothek Hamburg Carl von Ossietzky, 2019. http://d-nb.info/1229625690/34.

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10

Júnior, Francival Barbosa. "Analysis of electro-hydrostatic actuator in more electric aircraft." Instituto Tecnológico de Aeronáutica, 2006. http://www.bd.bibl.ita.br/tde_busca/arquivo.php?codArquivo=900.

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The aim of this dissertation is to evaluate the possibility of using electrically powered systems instead of a centralized hydraulic system composed of set of distribution pipes for aircrafts' primary control surfaces actuation. Focus will be given in the following topics: Description of new actuation technologies; Option chosen to be studied among the new possibilities; Comparison between the traditional system and the new proposal e System engineering evaluation regarding: weight, safety, thermal issue, connection with electric system, maintenance and certification. Besides that, a more elec

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11

Martin, Christopher M. "Pressure dependence of the luminescence and Raman modes in polyfluorene." Diss., Columbia, Mo. : University of Missouri-Columbia, 2005. http://hdl.handle.net/10355/4425.

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Thesis (Ph.D.)--University of Missouri-Columbia, 2006.<br>The entire dissertation/thesis text is included in the research.pdf file; the official abstract appears in the short.pdf file (which also appears in the research.pdf); a non-technical general description, or public abstract, appears in the public.pdf file. Title from title screen of research.pdf file viewed on (February 28, 2007) Vita. Includes bibliographical references.

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12

Bondarenko, A. I., M. O. Mittsel, and A. P. Kogushko. "Laboratory stand for research of the workflow in hydrostatic mechanical transmissions." Thesis, Vela Verlag, Germany, 2014. http://repository.kpi.kharkov.ua/handle/KhPI-Press/42212.

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The work of the laboratory stand as a whole as well as its particular elements is described. The effect of laws of parameters change of hydrostatic transmission fluid machines regulation and the laws of the braking torque change on the basic parameters of hydrostatic mechanical transmissions of different structures (two schemes were discussed: the first one with an inlet differential, the second - with an output differential) at implementation of both acceleration and deceleration processes is determined. The phenomenon of non-simultaneous translation of operating regimes of fluid machine

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13

Zavadinka, Peter. "Modelování a simulace pohonu mobilního pracovního stroje." Master's thesis, Vysoké učení technické v Brně. Fakulta strojního inženýrství, 2009. http://www.nusl.cz/ntk/nusl-228715.

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Táto diplomová práca sa zaoberá vytvorením dynamického modelu mobilného pracovného stroja. Ciežom práce je vytvorenie blokového modelu pohonu štvorkolesového mobilného pracovného stroja. Model hydrostatického prevodu bol dodaný firmou Sauer-Danfoss. Model mobilného pracovného stroja bol vytvorený v programe MATLAB-Simulink. Dalšou časťou práce je výber typu riadenia hydrostatického prevodu a návrh riadiaceho algoritmu hydrostatického prevodu. Výstupom práce je blokový matematicko-fyzikálny model pohonu štvorkolesového mobilného pracovného stroja spolu s riadiacim algoritmom hydrostatického pre

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14

Sparks, Jessica L. "Biomechanics of blunt liver injury relating internal pressure to injury severity and developing a constitutive model of stress-strain behavior /." Columbus, Ohio : Ohio State University, 2007. http://rave.ohiolink.edu/etdc/view?acc%5Fnum=osu1185909955.

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15

Namin, Masoud Montazeri. "A fully three-dimensional non-hydrostatic free surface flow model for hydro-environmental predictions : numerical investigations and development of a fully three-dimensional hydrodynamic (non-hydrostatic) turbulence and solute transport model based on an." Thesis, Cardiff University, 2003. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.399135.

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16

Bakenne, Adetokunboh. "Deformation and modulus changes of nuclear graphite due to hydrostatic pressure loading." Thesis, University of Manchester, 2013. https://www.research.manchester.ac.uk/portal/en/theses/deformation-and-modulus-changes-of-nuclear-graphite-due-to-hydrostatic-pressure-loading(aa6b8fd6-1c9f-4e71-b0dc-b5150b67223d).html.

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Graphite is used within a reactor as a moderator and a reflector material. During fast neutron irradiation, the physical properties and dimensions of nuclear graphite are changed significantly. Graphite shrinkage could lead to disengagement of individual component and loss of core geometry; differential shrinkage in the graphite component could lead to the generation of internal stresses and component failure by cracking. The latter behaviour is complicated by the irradiation induced changes in Young's modulus and strength. These dimensional and modulus change have been associated with the irr

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17

Leonard, Katherine H. L. "Mathematical and computational modelling of tissue engineered bone in a hydrostatic bioreactor." Thesis, University of Oxford, 2014. http://ora.ox.ac.uk/objects/uuid:05845740-1a74-4e19-95ea-6b5229d1af27.

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In vitro tissue engineering is a method for developing living and functional tissues external to the body, often within a device called a bioreactor to control the chemical and mechanical environment. However, the quality of bone tissue engineered products is currently inadequate for clinical use as the implant cannot bear weight. In an effort to improve the quality of the construct, hydrostatic pressure, the pressure in a fluid at equilibrium that is required to balance the force exerted by the weight of the fluid above, has been investigated as a mechanical stimulus for promoting extracellul

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18

De, Lamo Castellví Sílvia. "Behaviour of pathogenic gram negative bacteria inoculated in milk and model cheese treated with high hydrostatic pressure." Doctoral thesis, Universitat Autònoma de Barcelona, 2006. http://hdl.handle.net/10803/5672.

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Els efectes de les altes pressions hidrostàtiques i la capacitat per sobreviure, recuperar-se i créixer de tres microorganismes patògens (Yersinia enterocolitica, Escherichia coli Salmonella enterica) van ser investigats en llet desnatada i en un formatge model elaborat amb i sense estàrter. Les mostres inoculades amb aquests microorganismes, van ser tractades a 300, 400 i 500 MPa (exceptuant les mostres inoculades amb soques de S. enterica) durant 10 minuts a 20ºC o a temperatura ambient i van ser analitzades microbiològicament just després d'aplicar el tractament d'altes pressions i als 1, 2

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19

Newmiller, Jeanette Eileen. "River Hydraulics on a Steep Slope Can a 2D Model Push the Limits of the Hydrostatic Assumption?" Thesis, University of California, Davis, 2018. http://pqdtopen.proquest.com/#viewpdf?dispub=10635872.

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<p> The Saint-Venant shallow water equations are commonly used to model river hydraulics. The equations utilize a hydrostatic assumption with a recommendation to limit use to a bed slope less than 1:10, vertical to horizontal. This recommended limit was made in an era when calculations were performed by hand and therefore minimized by performing a one-dimensional analysis with the distance between river stations maximized. Current technology makes a more detailed analysis accessible. </p><p> This study investigates the effects of applying a two-dimensional hydraulic model that utilizes the S

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20

Adim, Mahieddine. "Modèles continûment stratifiés et systèmes multi-couches pour les écoulements géophysiques." Electronic Thesis or Diss., Université de Rennes (2023-....), 2024. http://www.theses.fr/2024URENS026.

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Dans cette thèse, nous établissons rigoureusement des ponts entre les écoulements continument stratifiés et les écoulements multi-couches. Dans une première partie, nous considérons le système de Saint-Venant multi-couches avec un terme supplémentaire diffusif qui a un effet régularisant, dont la motivation provient des travaux des océanographes Gent & McWilliams sur le mélange isopycnal et la diffusivité des tourbillons, et qui pourrait être interprété comme un terme de turbulence. En exploitant la structure de ce système, nous obtenons un dictionnaire qui nous permet d'interpréter ce sys

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21

Santos, Mickael da Costa. "Study of the influence of high hydrostatic pressure on wine chemical and sensorial characteristics." Doctoral thesis, Universidade de Aveiro, 2015. http://hdl.handle.net/10773/14822.

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Doutoramento em Química<br>During the last years, the use of high hydrostatic pressure (HHP) as a non-thermal technology for preservation or aging of wine has increased substantially in the academic community. However, HHP treated wine has been only analysed after the pressure treatment, with no knowledge available on the effects of HHP during subsequent storage. The results presented in this thesis showed that HHP treatments influence the chemical and sensorial properties of wine during storage. The application of high hydrostatic pressure treatments in winemaking for wine preservation, as a

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22

Bubnova, Radmila. "Pouziti souradnice "hydrostaticky tlak" pro integraci elastického modelu dynamiky atmosféry v numerickém predpovednim systému ARPEGE/ALADIN=." Toulouse 3, 1995. http://www.theses.fr/1995TOU30067.

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Arpege/aladin est un modele tri-dimensionnel a domaine limite, qui fait partie du systeme integre de prevision numerique arpege/ifs. Comme son equivalent global, la version a domaine limite utilise une representation spectrale des champs horizontaux. Une version non-hydrostatique d'arpege/aladin a ete developpee en utilisant la pression hydrostatique comme variable independante. La dynamique choisie represente la version totalement elastique des equations d'euler, l'orographie etant introduite par le biais d'une coordonnee hybride epousant la surface terrestre a sa base. Le schema semi-implici

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23

Bigikocin, Erman. "Effect Of High Hydrostatic Pressure (hhp) And High Dynamic Pressure (hdp) On Stability And Rheological Properties Of Model Oil-in-water Emulsions." Master's thesis, METU, 2010. http://etd.lib.metu.edu.tr/upload/12612416/index.pdf.

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High pressure applications are alternatives to conventional methods in food processing. They provide interesting modifications in food structures which leads to new product formulations. The aim of this study is to identify the effects of two different treatments, high hydrostatic pressure (HHP) and high dynamic pressure (HDP) on stability and rheological properties of model oil-in-water emulsions. Microfluidization was selected among the HDP homogenization techniques. The performance of each process was analyzed in terms of rheological modifications and emulsion stability improvements compare

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24

Oigawa, Masanori. "A study of water vapor variability associated with deep convection using a dense GNSS receiver network and a non-hydrostatic numerical model." 京都大学 (Kyoto University), 2016. http://hdl.handle.net/2433/215318.

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25

Zavadinka, Peter. "Development of a Variable Roller Pump and Evaluation of its Power Saving Potential as a Charge Pump in Hydrostatic Drivetrains." Doctoral thesis, Vysoké učení technické v Brně. Fakulta strojního inženýrství, 2015. http://www.nusl.cz/ntk/nusl-234261.

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Predložená doktorandská dizertačná práca (ďalej len práca) sa zaoberá rozsiahlou analýzou valčekového hydrogenerátora s premenlivým geometrickým objemom a predikciou výkonových úspor dosiahnutých aplikáciou navrhnutého valčekového hydrogenerátora s premenlivým geometrickým objemom v hydrostatickom pohone vybraných mobilných pracovných strojov. Teoretický rozbor princípov fungovania valčekového hydrogenerátora a teória jednorozmerného simulačného modelu sú popísané v prvej časti práce. Na základe odvodenej teórie je vytvorený simulačný model, ktorý je vhodný na predikciu priebehu tlaku v komorá

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26

Pilavtepe, Mutlu. "High Hydrostatic Pressure Induced Inactivation Kinetics Of E. Coli O157:h7 And S. Aureus In Carrot Juice And Analysis Of Cell Volume Change." Phd thesis, METU, 2007. http://etd.lib.metu.edu.tr/upload/12609205/index.pdf.

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The main objective of this study was to determine the pressure induced inactivation mechanism of pressure-resistant Escherichia coli O157:H7 933 and Staphylococcus aureus 485 in a low acid food. Firstly, inactivation curves of pathogens were obtained at 200 to 400 MPa at 40&ordm<br>C in peptone water and carrot juice. First-order and Weibull models were fitted and Weibull model described the inactivation curves of both pathogens more accurately than first-order model, revealing that food systems could exhibit either protective or sensitizing effect on microorganisms. Carrot juice had a protect

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27

Devlin, David J. J. "An investigation into the use of balance in operational numerical weather prediction." Thesis, University of St Andrews, 2011. http://hdl.handle.net/10023/1903.

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Presented in this study is a wide-ranging investigation into the use of properties of balance in an operational numerical weather prediction context. Initially, a joint numerical and observational study is undertaken. We used the Unified Model (UM), the suite of atmospheric and oceanic prediction software used at the UK Met Office (UKMO), to locate symmetric instabilities (SIs), an indicator of imbalanced motion. These are areas of negative Ertel potential vorticity (in the Northern hemisphere) calculated on surfaces of constant potential temperature. Once located, the SIs were compared with s

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Phan, Van Trung. "Modelling of the in service behaviour of passive insulated structures for deep sea offshore applications." Thesis, Brest, 2012. http://www.theses.fr/2012BRES0098/document.

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L’étude se situe dans le cadre de la recherche de gains de performance de structures d’isolations passives pour l’offshore profond. Le travail proposé a pour support des analyses expérimentales et numériques de tubes revêtus par des matériaux isolants utilisés en eau profonde pour transporter du fluide chaud. Le raboutage des tubes en acier, préalablement revêtus en atelier, nécessite un dégagement du revêtement aux extrémités pour réaliser l'opération d'assemblage (généralement par soudure). La partie dégagée est ensuite recouverte par un nouveau matériau pouvant être appliqué sur site. Ainsi

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29

Leger, Julien. "Un modèle d'ascendance convective simple prenant en compte explicitement le terme de pression non-hydrostatique." Phd thesis, Toulouse, INPT, 2018. http://oatao.univ-toulouse.fr/23929/1/LEGER_Julien.pdf.

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Les modèles d'ascendance convective utilisés actuellement dans les paramétrisations de la convection ne prennent pas en compte explicitement le terme de pression non-hydrostatique, bien que son rôle fondamental soit documenté et expliqué depuis les années 70. Pour palier cette limitation, un modèle anélastique pronostique à deux colonnes d'une ascendance convective,prenant en compte explicitement le terme de pression non-hydrostatique, a été développé avec une géométrie 2D et 3D. Des fonctions de forme sont introduites pour réduire l'impact de la basse résolution horizontale. Trois paramètres

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Makeen, Hafiz Antar Mohammad. "Analysis of anti-cancer drug penetration through multicell layers in vitro : the development and evaluation of an in vitro model for assessing the impact of convective fluid flow on drug penetration through avascular cancer tissues." Thesis, University of Bradford, 2012. http://hdl.handle.net/10454/5681.

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High interstitial fluid pressure (IFP) in tumours is recognized as a barrier to drug delivery resulting in reduced efficacy. High IFP impedes the normal process of convective fluid flow (CFF) from blood vessels into the interstitium. The aim of this study was to develop an in vitro model that could be used to measure CFF and to study its effects on drug delivery. The model consists of a transwell cell culture insert which supports the growth of multicell layers (MCL) on collagen coated membranes. A graduated tube is inserted into the transwell and a pressure gradient is applied across the memb

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Baquet, Emeric. "Ondes internes solitaires dans le Golfe de Guinée : cartographie et modélisation." Thesis, Brest, 2018. http://www.theses.fr/2018BRES0028/document.

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Les ondes internes sont observées partout dans le monde. Elles ont un rôle important dans la mise en place de la chaine trophique, et elles peuvent avoir un impact sur les activités humaines. Ainsi, dans le Golfe de Guinée, des ondes internes solitaires (OIS) ont provoqué des incidents sur des plateformes pétrolières. L’objectif de la thèse est d’identifier leurs zones de génération, leurs directions de propagation, ainsi que les conditions d’environnement susceptibles de les déclencher. La thèse a comporté deux aspects : d’une part des mesures de courant étaient disponibles et d’autre part la

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Manifacier, Ian. "Understanding adherent cell mechanics and the influence of substrate rigidity." Thesis, Aix-Marseille, 2016. http://www.theses.fr/2016AIXM4106/document.

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L’ingénierie tissulaire est une stratégie médicale qui repose sur la régénération de tissu par les cellules avec ou sans matériaux. Pour maîtriser cette synthèse, il faut comprendre la cellule comme une part intégrante du tissu. Hormis ses interactions biochimiques avec son support, la cellule interagit également mécaniquement avec son environnement. Elle s’accroche à ce dernier et évalue sa dureté pour adapter sa réponse biologique. Dans cette étude, j’ai développé des modèles numériques pour analyser l’influence de la rigidité du substrat sur le comportement mécanique de la cellule, sur sa s

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Вербовецька, Мар`Яна Валентинівна. "Покращення параметрів обробки на токарних верстатах з шпиндельними вузлами на гідростатичних опорах". Thesis, Тернопільський національний технічний університет імені Івана Пулюя, 2017. http://elartu.tntu.edu.ua/handle/123456789/19130.

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Вербовецька М.В. Покращення параметрів обробки на токарних верстатах з шпиндельними вузлами на гідростатичних опорах. 8.05050301 «Металорізальні верстати та системи» – Тернопільський національний технічний університет імені Івана Пулюя. – Тернопіль, 2017.<br>В роботі проведено конструювання шпиндельних вузлів токарних верстатів та розрахунок гідростатичних опор з контролем пружних і теплових деформацій на основі розв’язку задач гідродинаміки, теорії пружності й теплового балансу.<br>Робота складається з розрахунково-пояснювальної записки та графічної частини. Розрахунково-пояснювальна записка

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Chen, Dongju. "Analysis and identification technology of system errors of large vertical ultra-precision machine tool." Compiègne, 2010. http://www.theses.fr/2010COMP1890.

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Dans plusieurs pays, les technologies d'usinage d'ultra-précision apportent une contribution importante au développement des sciences et des hautes technologies, principalement dans les domaines de l'optique, des microsystèmes et des ordinateurs avec des applications dans l'industrie des semi-conducteurs, du stockage de données, de l'aéronautique et de l'espace. L'usinage d'ultra-précision est entré dans le domaine de la nano-échelle et devient une dé nécessaire au développement des hautes technologies tant civiles que militaires. L'objectif de la recherche était de développer des méthodes de

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Romanova, Mariya. "Theoretical study of the many-body electronic states of defects in diamond : the case of the NV center under high pressure." Thesis, Institut polytechnique de Paris, 2019. http://www.theses.fr/2019IPPAX013.

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Ce travail de doctorat a pour objet l’étude, dans le diamant, de l'influence de la pression sur les transitions optiques entres l’état fondamental et les états excités du centre « azote-lacune de carbone » NV, sans paramètre ajustable. Le centre neutre NV0 et le centre chargé négativement NV- ont chacun été étudiés. L’étude a nécessité le développement d’un modèle de Hubbard où les valeurs des interactions sont obtenues sans ajustement sur l’expérience, par une méthode de calcul à partir des principes premiers.Le centre NV est un défaut à niveaux profonds, ses propriétés optiques et magnétique

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36

Duffrene, Lucas. "Comportement viscoélastique d'un verre silico-sodocalcique dans le domaine des températures intermédiaires : approche phénoménologique et modélisation en triaxialité." Paris, ENMP, 1994. http://www.theses.fr/1994ENMP0515.

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Les opérations de mise en forme ou de traitement thermique (trempe, recuisson) sont généralement effectuées à des températures intermédiaires (500-650c) et à des niveaux de contraintes modérés pour lesquels le comportement mécanique du verre peut être décrit par une loi viscoélastique linéaire. L'objectif de la thèse est de réaliser une démarche expérimentale complète afin de modéliser le comportement viscoélastique en triaxialité d'un verre silico-sodocalcique. Les modules d'élasticité du verre ont été mesures par diffusion Brillouin dans le domaine de la transition. Des essais statiques de r

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37

Altaie, Huda. "Nouvelle technique de grilles imbriquées pour les équations de Saint-Venant 2D." Thesis, Université Côte d'Azur (ComUE), 2018. http://www.theses.fr/2018AZUR4220/document.

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Les écoulements en eau peu profonde se rencontrent dans de nombreuses situations d’intérêts : écoulements de rivières et dans les lacs, mais aussi dans les mers et océans (courants de marée, tsunami, etc.). Ils sont modélisés par un système d’équations aux dérivées partielles, où les inconnues sont la vitesse de l’écoulement et la hauteur d’eau. On peut supposer que la composante verticale de la vitesse est petite devant les composantes horizontales et que ces dernières sont indépendantes de la profondeur. Le modèle est alors donné par les équations de shallow water (SWEs). Cette thèse se conc

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38

Hoareau, Christophe. "Vibrations hydroélastiques de réservoirs élastiques couplés à un fluide interne incompressible à surface libre autour d’un état précontraint." Thesis, Paris, CNAM, 2019. http://www.theses.fr/2019CNAM1241/document.

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Abstract (sommario):

Cette thèse de doctorat porte sur le calcul par la méthode des éléments finis du comportement dynamique de réservoirs élastiques précontraints contenant un liquide interne à surface libre. Nous considérons que la pression hydrostatique exercée par le fluide interne incompressible sur les parois flexibles du réservoir est à l’origine de grands déplacements, conduisant ainsi à un état d’équilibre non-linéaire géométrique. Le changement de raideur lié à cet état précontraint induit un décalage des fréquences de résonances du problème de vibrations linéaires couplées.L’objectif principal du travai

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39

Nguyen, Thanh Don. "Impact de la résolution et de la précision de la topographie sur la modélisation de la dynamique d’invasion d’une crue en plaine inondable." Thesis, Toulouse, INPT, 2012. http://www.theses.fr/2012INPT0093/document.

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Nous analysons dans cette thèse différents aspects associés à la modélisation des écoulements à surface libre en eaux peu profondes (Shallow Water). Nous étudions tout d’abord le système d’équations de Saint-Venant à deux dimensions et leur résolution par la méthode numérique des volumes finis, en portant une attention particulière sur les aspects hyperboliques et conservatifs. Ces schémas permettent de traiter les équilibres stationnaires, les interfaces sec/mouillé et aussi de modéliser des écoulements subcritique, transcritique et supercritique. Nous présentons ensuite la théorie de la méth

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40

Rötger, Antonia. "Etude par magnétotransport de l'état d'onde de densité de charge dans les bronzes oxygénés quasi-bidimensionnels KMo6O17 et (PO2)4(WO3)2m." Grenoble 1, 1993. http://www.theses.fr/1993GRE10036.

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Nous avons etudie la magnetoresistance des bronzes oxygenes de metaux de transition, le bronze violet kmo#6o#1#7 et les composes m=4, 6, 7 de la famille (po#2)#4(wo#3)#2#m. Ces composes ont des proprietes quasi-bidimensionnelles. Ils subissent des transitions de peierls a une temperature t#p. La magnetoresistance de kmo#6o#1#7 a ete mesuree a des temperatures comprises entre 1. 8 k et 300 k en champ magnetique jusqu'a 37 t. Des oscillations quantiques ont ete observees. Base sur le concept du nesting cache, nous proposons un modele de la surface de fermi dans l'etat d'onde de densite de charge

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41

Von, Laue Lukas. "Transferts de protons par effet tunnel dans l'acide benzoique : le rôle des vibrations moléculaires." Université Joseph Fourier (Grenoble), 1997. http://www.theses.fr/1997GRE10060.

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Une description quantitative des transferts de protons inter- et intramoleculaires, qui sont parmi les reactions chimiques les plus fondamentales, demande une connaissance de la surface d'energie potentielle. Le present travail contribue a la caracterisation de cette surface pour un systeme modele, le monocristal d'acide benzoique. Proche des positions d'equilibre, la spectroscopie vibrationnelle apporte des informations, tandis que la barriere de potentiel est caracterisee par des mesures d'effet tunnel. Ces mesures, par spectroscopie optique (raman, absorption, emission) et diffusion quasi-e

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42

Wadzuk, Bridget Marie. "Hydrostatic and non-hydrostatic internal wave models." Thesis, 2004. http://hdl.handle.net/2152/1428.

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43

Wadzuk, Bridget Marie Hodges Ben R. "Hydrostatic and non-hydrostatic internal wave models." 2004. http://repositories.lib.utexas.edu/bitstream/handle/2152/1428/wadzukb05259.pdf.

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44

LASAPONARA, FRANCESCO. "Two-dimensional and three-dimensional non hydrostatic models for fully non-linear and dispersive hydrodynamic processes." Doctoral thesis, 2017. http://hdl.handle.net/11573/940654.

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The thesis is divided in two main parts. In the first part is presented a model based on a numerical integration of a new conservative form of the Fully Non-linear Boussinesq Equations (FNBE) in a contravariant formulation. As known coastal regions are characterized by a very complex morphology: presence of anthropic structures, river mouth or shoreline with articulated geometry. The use of orthogonal grid, as Cartesian coordinate, requests a huge number of calculus points that may be prohibitive. To solve this issue, a well known strategy is to integrate the motion equations on generalized c

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45

Liu, Qian Yi, and 劉千義. "2-dimensional non-hydrostatic model." Thesis, 1996. http://ndltd.ncl.edu.tw/handle/95250283044138648727.

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46

Ye, Yu Cheng, and 葉育成. "2-dimmensional non-hydrostatic model on mountain wave." Thesis, 1996. http://ndltd.ncl.edu.tw/handle/04995982448381526430.

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47

Komolova, Marina. "Evidence Linking Alterations in the Moment-to-Moment Pressure-Natriuresis Mechanism to Hypertension and Salt-Sensitivity in Rodents." Thesis, 2010. http://hdl.handle.net/1974/5672.

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Abstract (sommario):

Hypertension and salt-sensitivity are independent risk factors for cardiovascular disease. Although both conditions are idiopathic, they develop due to a complex interplay between susceptibility genes and environmental factors. Given that the kidney plays an important role in regulating blood pressure, in particular, by maintaining sodium and water balance via pressure-natriuresis, it is not surprising that disturbances in the proper functioning of this intrarenal mechanism have been linked to these conditions. Although direct coupling of changes in renal arterial pressure (RAP) to renal in

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48

Lin, Yi-Chun, та 林怡君. "A 3D Hydrostatic k-ε model for Open-Channel Flow". Thesis, 2014. http://ndltd.ncl.edu.tw/handle/42s4q8.

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碩士<br>國立交通大學<br>土木工程系所<br>102<br>A 3D hydrostatic model based on a vertical horizontal splitting (VHS) concept is developed in this study. The standard k-ε model, a two-equation turbulent model, and two kinds of zero-equation models are adopted to calculate eddy viscosity. The orthogonal curvilinear coordinate system and the sigma coordinate system are used to cope with the irregularity of channel geometry. The water elevation and the depth-averaged velocity will be solved by the 2D depth-averaged model, and then the velocity profile along the vertical direction will be solved by the velocity

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49

Young, Chih-Chieh, and 楊智傑. "Development of a Non-hydrostatic Model for Simulating Free-surface Waves." Thesis, 2009. http://ndltd.ncl.edu.tw/handle/10813124454541610838.

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博士<br>國立臺灣大學<br>土木工程學研究所<br>97<br>A higher-order 3D non-hydrostatic model in a sigma-coordinate system is developed for simulating free-surface wave propagation from deep to shallow waters. The model using an implicit finite difference scheme on a staggered grid simultaneously solves the unsteady Navier–Stokes equations and the free-surface boundary condition. A higher-order top-layer pressure treatment is proposed to resolve dispersive wave propagation. To capture non-linear waves, a 4th-order spatial discretization is utilized to approximate the large horizontal pressure gradient. Based on a

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50

HILMER, ROBERT V. "A MAGNETO-HYDROSTATIC MODEL OF MAGNETIC FIELD ROTATION THROUGH THE GEOMAGNETIC TAIL (MAGNETOSPHERE, IMF)." Thesis, 1986. http://hdl.handle.net/1911/13166.

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