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Rozprawy doktorskie na temat „Granular Dynamics”

Autor: Grafiati
Data publikacji: 4 czerwca 2021
Data aktualizacji: 25 lipca 2025

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1

Zeilstra, Christiaan. "Granular dynamics in vibrated beds." Enschede : University of Twente [Host], 2007. http://doc.utwente.nl/57836.

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2

Higgins, Anthony. "The dynamics of granular materials." Thesis, University of Cambridge, 1992. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.259539.

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Isert, Nathan. "Dynamics of levitated granular materials." [S.l. : s.n.], 2006. http://nbn-resolving.de/urn:nbn:de:bsz:352-opus-27683.

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Marks, Benjamin. "Grainsize dynamics of granular flows." Thesis, The University of Sydney, 2013. http://hdl.handle.net/2123/9372.

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This dissertation deals with the description of a granular material as a continuum with an internal coordinate that represents the grainsize distribution. The inclusion of this internal coordinate allows us to describe polydispersity in a natural and simple manner. The bulk of this dissertation is built on four published papers. Each paper is prefaced by an introductory section, where the motivation for the paper is presented. In the first paper, I show how the fundamental mechanism of granular segregation can be represented in a cellular automaton. An equivalent continuum model is derived
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Zheng, Li-Yang. "Granular monolayers : wave dynamics and topological properties." Thesis, Le Mans, 2017. http://www.theses.fr/2017LEMA1035/document.

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Les cristaux granulaires sont des structures périodiques de particules disposées en réseau cristallin. Les interactions entre ces billes peuvent être modélisées par leurs contacts, qui ont des dimensions et des masses effectives beaucoup plus petites que celles des billes. Ceci induit une propagation d'ondes élastiques dans les structures granulaires avec des vitesses significativement plus lentes que dans le matériau des grains individuels. En outre, en raison de forces de cisaillement non centrales, les rotations de particules peuvent être initiées, conduisant à des modes de phononiques supp
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Laufer, Michael Robert. "Granular Dynamics in Pebble Bed Reactor Cores." Thesis, University of California, Berkeley, 2013. http://pqdtopen.proquest.com/#viewpdf?dispub=3593891.

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<p> This study focused on developing a better understanding of granular dynamics in pebble bed reactor cores through experimental work and computer simulations. The work completed includes analysis of pebble motion data from three scaled experiments based on the annular core of the Pebble Bed Fluoride Salt-Cooled High- Temperature Reactor (PB-FHR). The experiments are accompanied by the development of a new discrete element simulation code, GRECO, which is designed to offer a simple user interface and simplified two-dimensional system that can be used for iterative purposes in the preliminary
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7

Sanders, Duncan Alexander. "Intruder particle dynamics in vibrated granular beds." Thesis, University of Nottingham, 2006. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.432036.

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Hoomans, Bob Petrus Bernardus. "Granular dynamics of gas-solid two-phase flows." Enschede : University of Twente [Host], 2000. http://doc.utwente.nl/9461.

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SIGAUD, LUCAS MAURICIO. "STUDIES ON THE DYNAMICS OF DENSE GRANULAR SYSTEMS." PONTIFÍCIA UNIVERSIDADE CATÓLICA DO RIO DE JANEIRO, 2009. http://www.maxwell.vrac.puc-rio.br/Busca_etds.php?strSecao=resultado&nrSeq=15153@1.

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FUNDAÇÃO DE APOIO À PESQUISA DO ESTADO DO RIO DE JANEIRO<br>Materiais granulares, por sua enorme gama de aplicaçõesindustriais (da indústria alimentícia à astrofísica), vêm sendo cada vez mais estudados durante as últimas duas décadas. No entanto, muito da descrição física inerente ao comportamento deste tipo de material ainda elude os cientistas, tornando este um campo particularmente rico de investigação. Dentre as questões insolutas, estão algumas de crescente interesse, como os mecanismos de fluxo e transporte de grãos, que descrevem fenômenos como a difusão correlacionada e a formação de
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10

Wang, Da. "Accelerated granular matter simulation." Doctoral thesis, Umeå universitet, Institutionen för fysik, 2015. http://urn.kb.se/resolve?urn=urn:nbn:se:umu:diva-110164.

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Modeling and simulation of granular matter has important applications in both natural science and industry. One widely used method is the discrete element method (DEM). It can be used for simulating granular matter in the gaseous, liquid as well as solid regime whereas alternative methods are in general applicable to only one. Discrete element analysis of large systems is, however, limited by long computational time. A number of solutions to radically improve the computational efficiency of DEM simulations are developed and analysed. These include treating the material as a nonsmooth dynamical
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11

Holladay, Seth R. "Optimized Simulation of Granular Materials." BYU ScholarsArchive, 2013. https://scholarsarchive.byu.edu/etd/3856.

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Visual effects for film and animation often require simulated granular materials, such as sand, wheat, or dirt, to meet a director's needs. Simulating granular materials can be time consuming, in both computation and labor, as these particulate materials have complex behavior and an enormous amount of small-scale detail. Furthermore, a single cubic meter of granular material, where each grain is a cubic millimeter, would contain a billion granules, and simulating all such interacting granules would take an impractical amount of time for productions. This calls for a simplified model for granul
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12

Gravish, Nicholas Grey. "Collective dynamics of matter with granularity." Diss., Georgia Institute of Technology, 2013. http://hdl.handle.net/1853/47631.

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Granular materials are abundant in the natural and industrial environment. Typical granular materials are collections of inert, passive particles in which the constituent grains of the material are macroscopic; thus they fill space, are athermal, and interact through only local contact forces. This definition can be broadened to include non-inert particles as well-active particles-in which the grains of an active granular material possess an internal energy source which drives motion. Active granular materials are found in many areas of the biological world, from cattle stampedes and pedestria
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13

Coetzee, C. J. (Cornelis Jacobus). "Forced granular flow." Thesis, Stellenbosch : Stellenbosch University, 2000. http://hdl.handle.net/10019.1/51764.

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Thesis (MEng)--University of Stellenbosch, 2000.<br>ENGLISH ABSTRACT: The main goal of the thesis is to validate the ability of discrete element methods (DEM) to predict forced granular flow. Granular flow occurs in a broad spectrum of industrial applications. The thesis focuses on earthmoving processes typical of the mining and agricultural industries. Existing soil mechanics soil-tool models are also investigated and general flow behaviour in and around blades and buckets are established. Soil mechanics theories are used to predict the draft forces on a flat blade moving through granu
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14

Sun, Yi. "On efficiency of multibody approach in granular dynamics simulations." Thesis, National Library of Canada = Bibliothèque nationale du Canada, 1996. http://www.collectionscanada.ca/obj/s4/f2/dsk3/ftp05/nq20898.pdf.

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15

Renaut, Nathalie. "Granular dynamics simulations of wind-driven, broken ice fields." Thesis, McGill University, 1995. http://digitool.Library.McGill.CA:80/R/?func=dbin-jump-full&object_id=23445.

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A numerical model is being developed for ice forecasting which is based on a granular dynamics approach. This model is intended to analyse the movements of broken ice fields at the mesoscale; i.e. for length scales of the order of 100 km and time scales of the order of a few days. It will therefore be useful for navigation, for the operation of offshore drilling platforms and for commercial fishing. At the mesoscale, the forces governing the motion of ice floes are wind drag, water drag, Coriolis force and the contact forces arising from internal collisions. Expressions are developed to evalua
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16

Rambach, Paul. "Granular chains, an alternative to study confined polymer dynamics." Thesis, Université Paris sciences et lettres, 2020. http://www.theses.fr/2020UPSLS015.

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La dynamique des chaines est encore de nos jours une question ouverte en physique des polymères, tout particulièrement lorsque les interactions répulsives sont prises en compte. Néanmoins, répondre à cette question améliorerait nos connaissances sur la machinerie cellulaire. On peut penser, par exemple, au transport de l'ARN du noyau au cytoplasme ou encore à l'injection du matériel génétique de bactériophages dans les bactéries. Malheureusement, étudier ces polymères en situation confinée est aussi expérimentalement difficile que biologiquement pertinent. En dépit des récentes avancées en nan
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17

Kharel, Prashidha. "Internal Dynamics and Flow Properties of Dense Granular Materials." Thesis, The University of Sydney, 2018. http://hdl.handle.net/2123/19647.

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This thesis deals with the micro-mechanics of dense granular flows and how they affect the overall flow and mixing behaviours of grains. Discrete Element Simulations of dense granular flows are performed at various flow geometries, giving us insights into the internal kinematics and dynamics of flow. This allows us to connect the micro-mechanics to the effective transport properties like self-diffusivity, viscosity and non-local rheology. The thesis is comprised of three published papers. The first paper shows how the development of granular vortices gives rise to enhanced mixing of grains i
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18

Lun, Cliff Ki Keung. "Kinetic theories of granular flow." Thesis, McGill University, 1985. http://digitool.Library.McGill.CA:80/R/?func=dbin-jump-full&object_id=73989.

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19

Estep, Joseph Jeremiah. "Substrate effects from force chain dynamics in dense granular flows." Thesis, Georgia Institute of Technology, 2011. http://hdl.handle.net/1853/39583.

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Granular materials are composed of solid, discrete particles and exhibit mechanical behavior that differs from those of fluids and solids. The rheology of granular flows is principal to a suite of natural hazards. Laboratory experiments and numerical models have adequately reproduced several features observed in terrestrial gravity driven geophysical flows; however, quantitative comparison to field observations exposes a failure to explain the high mobility and duration of many of these flows. The ability of a granular material to resist deformation is a function of the force chain network inh
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20

Wyburn, Edward Ross. "The Dynamics of Rod-like Intruders in Sheared Granular Flow." Thesis, University of Sydney, 2020. https://hdl.handle.net/2123/23276.

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While there exist many examples of intruding objects within a granular system, the behaviour of a free-flowing intruder is relatively unknown. The purpose of this thesis is to further our understanding of both free-flowing intruder behaviour and its influence on the surrounding grains. We have analysed the dynamics of a single rod-like intruder within a sheared granular flow of disks, for a range of different elongations and sizes, with a focus on its rotational behaviour. This analysis has been undertaken with both experiments and discrete element method simulations. Experiments were performe
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21

De, Toni Stefano. "A two-dimensional model for the dynamics of granular avalanches." Doctoral thesis, Università degli studi di Trento, 2005. https://hdl.handle.net/11572/369168.

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Zoning of avalanche risk areas is one important task of land-use planning in alpine areas. The lack of records, due to the low frequency of these events, makes it di cult to implement a statistical analysis. Simulations made with physical and mathematical models can improve the knowledge of the dynamics of these events. In this thesis three di different mathematical and numerical models, based on the rheological theory of Savage and Hutter for granular flows, are introduced. A one dimensional model with variable width, written in a curvilinear coordinate system, has been developed. New rheolog
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22

De, Toni Stefano. "A two-dimensional model for the dynamics of granular avalanches." Doctoral thesis, University of Trento, 2005. http://eprints-phd.biblio.unitn.it/609/3/StefanoDeToni2005.pdf.

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Zoning of avalanche risk areas is one important task of land-use planning in alpine areas. The lack of records, due to the low frequency of these events, makes it dicult to implement a statistical analysis. Simulations made with physical and mathematical models can improve the knowledge of the dynamics of these events. In this thesis three didifferent mathematical and numerical models, based on the rheological theory of Savage and Hutter for granular flows, are introduced. A one dimensional model with variable width, written in a curvilinear coordinate system, has been developed. New rheolog
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23

Coetzee, Corne J. "The modelling of granular flow using the particle-in-cell method." Thesis, Stellenbosch : University of Stellenbosch, 2004. http://hdl.handle.net/10019.1/1334.

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Thesis (PhD (Mechanical and Mechatronic Engineering))--University of Stellenbosch, 2004.<br>Granular flow occurs in a broad spectrum of industrial applications that range from separation and mixing in the pharmaceutical industry, to grinding and crushing, blasting, stockpile construction, flow in and from hoppers, silos, bins, and conveyer belts, agriculture, mining and earthmoving. Two totally different approaches of modelling granular flow are the Discrete Element Method (DEM) and continuum methods such as Finite Element Methods (FEM). Continuum methods can be divided into nonpolar or
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24

Hughes, Graeme David. "The dynamical properties of percolating structures." Thesis, Lancaster University, 1989. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.302931.

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25

Kaddouri, Abdelhamid. "Infinitesimal and finite deformation analysis of saturated granular materials in statics and dynamics." Thesis, Heriot-Watt University, 2001. http://hdl.handle.net/10399/496.

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26

Newlon, Scott. "INTRUDER DYNAMICS RESPONSE OF GRANULAR MEDIA WITH NON-LINEAR INTERACTION POTENTIALS." OpenSIUC, 2017. https://opensiuc.lib.siu.edu/theses/2252.

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An investigation into the intruder dynamics of dry dimensionless, frictionless discs in bidispersed, disordered systems is carried out using computer simulations. The velocity of an intruder particle driven under constant force is used as a tool to determine scaling of velocity as a function of packing pressure. Using these velocity for a range of pressures, $4 \times 10^{-7}\leq P \leq 4 \times 10^{-2}$. A universal scaling relation is proposed and plotted. The force required to cause the packing to yield to the driven intruder is determined and plotted as function of pressure. Power la
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27

Meruane, Naranjo Carolina. "Continuum Equations for Studying the Dynamics of Dense Heterogeneous Granular Flows." Tesis, Universidad de Chile, 2010. http://www.repositorio.uchile.cl/handle/2250/102493.

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La mayoría de los flujos granulares densos en la naturaleza, tales como avalanchas de detritos, flujos piroclásticos, deslizamientos de tierra y avalanchas subacuáticas, están constituidos por una amplia gama de diferentes componentes sólidas inmersas en un fluido ambiente. Con el objeto de obtener una buena representación de la dinámica de estos flujos, se debe considerar los mecanismos de interacción entre los diferentes componentes de la mezcla. En este trabajo de tesis, se desarrolló un marco teórico basado en la teoría de mezcla para representar la dinámica de un flujo denso de material g
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28

Varas, Siriany Germàn. "Air rise through an immersed granular bed : - bulk and surfaces dynamics." Phd thesis, Ecole normale supérieure de lyon - ENS LYON, 2011. http://tel.archives-ouvertes.fr/tel-00690436.

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When air is injected at the bottom of an immersed granular layer, it crosses the system by percolating or fracturing. It thus forms several paths that reach the free surface of the layer at different locations. In this thesis, we study this process experimentally (for a three and two dimensional setup), numerically and theoretically. First, we focus on the dynamics of the air invading the medium at short and long time scale, when injecting a continuous air flow. At long time, the typical size of the region explored by the air can be accounted for by a diffusion-like process [1]. We also invest
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Pettersson, Thomas. "Analysis and implementation of the Smooth Discrete Element Method in AgX." Thesis, Linköpings universitet, Beräkningsmatematik, 2015. http://urn.kb.se/resolve?urn=urn:nbn:se:liu:diva-121563.

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We encounter granular materials on a daily basis. We walk up a gravel path or we eat our breakfast cereals. When handling granular materials on an industrial scale it is important to do so efficiently, to avoid unnecessary energy losses, wear and tear. To help designing efficient tools for handling these materials engineers uses numerical simulations. This project investigates the difference between the two main approaches to simulation of granular materials, the Smooth- and Non-smooth Discrete Element Methods by implementing the Smooth method into AgX dynamics were the Non-smooth method alrea
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Takagi, Daisuke. "Spreading of viscous fluids and granular materials on slopes." Thesis, University of Cambridge, 2010. https://www.repository.cam.ac.uk/handle/1810/228707.

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Materials can flow down a slope in a wide range of geophysical and industrial contexts, including lava flows on volcanoes and thin films on coated surfaces. The aim of my research is to provide quantitative insight into these forms of motion and their dependence on effects of the topography, the volume and the rheology of the flowing structure. Numerous different problems are investigated through mathematical models, which are developed analytically and confirmed by laboratory experiments. The initial advance of long lava flows is studied by considering the flow of viscous fluid released on sl
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31

Hofmann, Marc [Verfasser], and Jürgen [Akademischer Betreuer] Blum. "Dynamics of Granular Material on Small Bodies / Marc Hofmann ; Betreuer: Jürgen Blum." Braunschweig : Technische Universität Braunschweig, 2014. http://d-nb.info/1175820334/34.

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32

Montserrat, Michelini Santiago Rafael. "Internal dynamics of gravitational dense granular flows: Experimental study and numerical modeling." Tesis, Universidad de Chile, 2012. http://www.repositorio.uchile.cl/handle/2250/112059.

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Doctor en Ciencias de la Ingeniería, Mención Fluidodinámica<br>El estudio de flujos granulares resulta importante en distintas aplicaciones industriales, como también para lograr una mejor comprensión de fenómenos naturales. Los flujos granulares que ocurren en la naturaleza muchas veces presentan un gran poder destructivo. Por ello, la predicción de la ocurrencia y comportamiento de éstos a escalas geofísicas resulta de gran interés para el ordenamiento territorial y evaluación del riesgo en asentamientos humanos y numerosas faenas industriales. Ejemplos de flujos granulares a escalas geofísi
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33

Martin, Hugo André Roger. "Convex contact dynamics methods with friction : granular flow and generated elastic waves." Thesis, Université de Paris (2019-....), 2019. https://theses.md.univ-paris-diderot.fr/MARTIN_Hugo_Andre_Roger_va1.pdf.

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Ces travaux concernent la modélisation des milieux granulaires denses et leurs interactions avec des phénomènes acoustiques à l’échelle du laboratoire.Les modèles modélisant le mouvement des grains qui ont été développés se classent dans la catégorie des méthodes aux éléments discrets de type non régulières, souvent référencée sous la dénomination de “dynamique des contacts”. Lorsque l’on considère des forces de frottement entre particules dans ces modèles, on obtient des problèmes d’optimisation sous contraintes qui ont la particularité d’être non-convexes. On propose ici deux approches conve
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34

Hedman, Stefan. "Smooth and non-smooth approaches to simulation of granular matter." Thesis, Umeå universitet, Institutionen för fysik, 2011. http://urn.kb.se/resolve?urn=urn:nbn:se:umu:diva-50584.

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Granular matter is defined as a collection of particle grains, such as sand.This type of matter have different characteristics (solid, liquid and gas) depending on the energy level per grain. There are several approaches to modeling and numerical simulations of granular matter. They are used by different groups for different purposes, and the choice between the approaches is based on knowledge and tradition rather than what might be best for the purpose. The key questions are when to use what method and what physical quality is lost depending on the choice.Two regimes of discrete element granu
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35

Kröner, Christian [Verfasser]. "Experimental and numerical description of rapid granular flows and some baseline constraints for simulating 3-dimensional granular flow dynamics / Christian Kröner." Bonn : Universitäts- und Landesbibliothek Bonn, 2014. http://d-nb.info/105791522X/34.

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Coetzee, Corné J. "The modelling of granular flow using the particle-in-cell method /." Link to the online version, 2004. http://hdl.handle.net/10019.1/1334.

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Cawthorn, Christopher John. "Several applications of a model for dense granular flows." Thesis, University of Cambridge, 2011. https://www.repository.cam.ac.uk/handle/1810/245044.

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This dissertation describes efforts to evaluate a recently proposed continuum model for the dense flow of dry granular materials (Jop, Forterre & Pouliquen, 2006, Nature, 441, 167-192). The model, based upon a generalisation of Coulomb sliding friction, is known to perform well when modelling certain simple free surface flows. We extend the application of this model to a wide range of flow configurations, beginning with six simple flows studied in detailed experiments (GDR MiDi, 2004, Eur. Phys. J. E, 14, 341-366). Two-dimensional shearing flows and problems of linear stability are also addres
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38

Nguyen, Hong Trung. "Coarse-grained Modeling Studies of Polymeric and Granular Systems." Scholar Commons, 2018. http://scholarcommons.usf.edu/etd/7202.

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This Dissertation is devoted to computational study of the solidification, dynamics and mechanics of model semiflexible polymers with variable chain flexibility as well as a computational investigation of the clogging phenomena observed in granular materials. Chain stiffness is an intrinsic factor that governs single-chain flexibility. It plays a critical role in the physics of polymeric materials. In this work, we employ a coarse-grained polymer model in which chain stiffness can be tuned by a single parameter (bending stiffness kb) that yields chain shape ranging from coil-like to rod-like i
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39

Sirmas, Nick. "Dynamics and Stability of Shock Waves in Granular Gases Undergoing Activated Inelastic Collisions." Thesis, Université d'Ottawa / University of Ottawa, 2017. http://hdl.handle.net/10393/36568.

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The present work investigates the dynamics and stability of shock waves in granular gases. The problem was modelled for a piston propagating into a system of disks that can undergo inelastic collisions if an impact threshold is exceeded. The model was addressed numerically at the microscopic and macroscopic levels. The molecular dynamics methodology employed the Event-Driven Molecular Dynamics method, and the continuum model was formulated using the Navier-Stokes equations for granular gases with the transport terms of Jenkins and Richman and a modified cooling rate term. The inviscid stea
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40

Torres, Menéndez Harol [Verfasser], Thorsten [Akademischer Betreuer] Pöschel, Thorsten [Gutachter] Pöschel, and Ernesto [Gutachter] Altshuler. "Granular Leidenfrost effect in microgravity and collective dynamics of active granular particles / Harol Torres Menéndez ; Gutachter: Thorsten Pöschel, Ernesto Altshuler ; Betreuer: Thorsten Pöschel." Erlangen : Friedrich-Alexander-Universität Erlangen-Nürnberg (FAU), 2021. http://d-nb.info/1228627541/34.

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41

Selvatici, Elena. "Variational formulation for Granular Contact Dynamics simulation via the Alternating Direction Method of Multipliers." Master's thesis, Alma Mater Studiorum - Università di Bologna, 2021.

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The subject of this thesis is the development of a calculation software for the numerical analysis and the dynamic simulation of a granular flow. One of the major problems encountered in the dynamic analysis of the mechanical behaviour of a granular medium is the enormous computational time taken to reach the solution of the problem. Following studies that have verified the effectiveness of the implicit formulation proposed by the Granular Contact Dynamics approach, the idea of this thesis arises from the desire to apply the Alternating Direction Method of Multipliers for the optimization
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42

Stärk, Elmar [Verfasser], Jürgen [Akademischer Betreuer] Horbach, and Stefan [Akademischer Betreuer] Egelhaaf. "Dynamics of Granular Matter in Two Dimensions / Elmar Stärk. Gutachter: Jürgen Horbach ; Stefan Egelhaaf." Düsseldorf : Universitäts- und Landesbibliothek der Heinrich-Heine-Universität Düsseldorf, 2014. http://d-nb.info/1052654274/34.

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43

Ahnert, Karsten. "Compactons in strongly nonlinear lattices." Phd thesis, Universität Potsdam, 2010. http://opus.kobv.de/ubp/volltexte/2010/4853/.

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In the present work, we study wave phenomena in strongly nonlinear lattices. Such lattices are characterized by the absence of classical linear waves. We demonstrate that compactons – strongly localized solitary waves with tails decaying faster than exponential – exist and that they play a major role in the dynamics of the system under consideration. We investigate compactons in different physical setups. One part deals with lattices of dispersively coupled limit cycle oscillators which find various applications in natural sciences such as Josephson junction arrays or coupled Ginzburg-Landau e
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Wersäll, Carl. "Frequency Optimization of Vibratory Rollers and Plates for Compaction of Granular Soil." Doctoral thesis, KTH, Jord- och bergmekanik, 2016. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-187352.

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Vibratory rollers are commonly used for compaction of embankments and landfills. This task is time consuming and constitutes a significant part of most large construction and infrastructure projects. By improving the compaction efficiency, the construction industry would reduce costs and environmental impact. This research project studies the influence of the vibration frequency of the drum, which is normally a fixed roller property, and whether resonance can be utilized to improve the compaction efficiency. The influence of frequency on roller compaction has not before been studied but the co
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Woudberg, Sonia. "Laminar flow through isotropic granular porous media." Thesis, Link to the online version, 2006. http://hdl.handle.net/10019/1320.

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Swartzel, Jeffrey M. "Rolling of an Elliptic-Shaped Particle in Two Dimensions: A Mathematical Model." Akron, OH : University of Akron, 2009. http://rave.ohiolink.edu/etdc/view?acc%5Fnum=akron1240522472.

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Thesis (M.S.)--University of Akron, Dept. of Mathematics, 2009.<br>"May, 2009." Title from electronic thesis title page (viewed 7/28/2009) Advisor, Dmitry Golovaty; Faculty Readers, Gerald Young, Patrick Wilber; Department Chair, Joseph Wilder; Dean of the College, Chand Midha; Dean of the Graduate School, George R. Newkome. Includes bibliographical references.
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Jongchansitto, Pawarut. "Mechanical analysis of 2D composite granular materials : thermomechanical experiments and numerical simulations." Thesis, Clermont-Ferrand 2, 2015. http://www.theses.fr/2015CLF22592/document.

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L'objectif de la thèse est d'analyser le comportement mécanique de matériaux granulaires composites bidimensionels en terme de textures granulaires en utilisant deux approches : étude expérimentale par "thermoelastic stress analysis" et étude numérique par dynamique moléculaire. Les systèmes granulaires composites sont préparés à l'aide de cylindres en polyoxyméthylène (POM) et polyéthylène haute densité (PEHD), présentant un rapport de rigidité de 4 entre eux. Différents rapports de diamètres et de nombres de particules sont considérés. Les résultats expérimentaux et numériques sont en bon ac
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Wang, Ruopeng 1972. "Study of gas flow dynamics in porous and granular media with laser-polarized ¹²⁹Xe NMR." Thesis, Massachusetts Institute of Technology, 2005. http://hdl.handle.net/1721.1/34652.

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Thesis (Ph. D.)--Massachusetts Institute of Technology, Dept. of Nuclear Engineering, 2005.<br>Includes bibliographical references (p. 173-182).<br>This thesis presents Nuclear Magnetic Resonance (NMR) studies of gas flow dynamics in porous and granular media by using laser-polarized ¹²⁹Xe . Two different physical processes, the gas transport in porous rock cores and the mass exchanges between different phases in fluidized granular systems, were investigated and new experimental methods were designed to measure several important parameters characterizing the two systems. Methods for measuring
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Luomaranta, Henri. "Essays in Firm Dynamics, Ownership and Aggregate Effects." Thesis, Toulouse 1, 2019. http://www.theses.fr/2019TOU10021/document.

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Le résumé en français n'a pas été communiqué par l'auteur<br>Administrative registers maintained by statistical offices on vastly heterogeneous firms have much untapped potential to reveal details on sources of productivity of firms and economies alike. It has been proposed that firm-level shocks can go a long way in explaining aggregate fluctuations. Based on novel monthly frequency data, idiosyncratic shocks are able to explain a sizable share of the Finnish economic fluctuations, providing support to the granular hypothesis. The global financial crisis of 2007-2008 has challenged the field
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Maladen, Ryan Dominic. "Biological, simulation, and robotic studies to discover principles of swimming within granular media." Diss., Georgia Institute of Technology, 2010. http://hdl.handle.net/1853/42852.

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The locomotion of organisms whether by running, flying, or swimming is the result of multiple degree-of-freedom nervous and musculoskeletal systems interacting with an environment that often flows and deforms in response to movement. A major challenge in biology is to understand the locomotion of organisms that crawl or burrow within terrestrial substrates like sand, soil, and muddy sediments that display both solid and fluid-like behavior. In such materials, validated theories such as the Navier-Stokes equations for fluids do not exist, and visualization techniques (such as particle image vel
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