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Дисертації з теми "Interacting particles systems"

Автор: Grafiati
Опубліковано: 2 листопада 2024
Оновлено: 31 липня 2025

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1

Glass, K. "Dynamics of systems of interacting particles." Thesis, University of Cambridge, 1999. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.599435.

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In this thesis, we bring together three different problems in studying the equations where u<I><SUB>i</SUB></I> is a vector of length <I>m</I>, and <I>β</I> is a real parameter restricted to <I>β </I>≥ -1. The <I>N</I>-body problem concerns <I>N</I> masses attracting one another according to a (1)/(<I>r<SUP>2</SUP></I>) gravitational force. Much work has been done in finding <I>central configurations </I>of the <I>N</I> masses. If a system of masses released from a central configuration, it will remain similar to itself for all time, and can exhibit periodic behaviour.
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2

Franz, Benjamin. "Recent modelling frameworks for systems of interacting particles." Thesis, University of Oxford, 2014. http://ora.ox.ac.uk/objects/uuid:ac76d159-4cdd-40c9-b378-6ea1faf48aed.

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In this thesis we study three different modelling frameworks for biological systems of dispersal and combinations thereof. The three frameworks involved are individual-based models, group-level models in the form of partial differential equations (PDEs) and robot swarms. In the first two chapters of the thesis, we present ways of coupling individual based models with PDEs in so-called hybrid models, with the aim of achieving improved performance of simulations. Two classes of such hybrid models are discussed that allow an efficient simulation of multi-species systems of dispersal with reaction
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3

Romanovsky, Igor Alexandrovich. "Novel properties of interacting particles in small low-dimensional systems." Diss., Available online, Georgia Institute of Technology, 2006, 2006. http://etd.gatech.edu/theses/available/etd-07102006-041659/.

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Thesis (Ph. D.)--Physics, Georgia Institute of Technology, 2007.<br>Landman, Uzi, Committee Member ; Yannouleas, Constantine, Committee Member ; Bunimovich, Leonid, Committee Member ; Chou, Mei-Yin, Committee Member ; Pustilnik, Michael, Committee Member.
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4

Jacquot, Stéphanie Mireille. "Large systems of interacting particles : the Marcus-Lushnikov process and the β-Laguerre ensemble". Thesis, University of Cambridge, 2012. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.610327.

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5

Geiger, Benjamin [Verfasser], and Klaus [Akademischer Betreuer] Richter. "From few to many particles: Semiclassical approaches to interacting quantum systems / Benjamin Geiger ; Betreuer: Klaus Richter." Regensburg : Universitätsbibliothek Regensburg, 2020. http://d-nb.info/1215906064/34.

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6

Lafleche, Laurent. "Dynamique de systèmes à grand nombre de particules et systèmes dynamiques." Thesis, Paris Sciences et Lettres (ComUE), 2019. http://www.theses.fr/2019PSLED010.

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Анотація:
On étudie dans cette thèse le comportement en temps long de solutions d’équations aux dérivées partielles. Celles-ci modélisent des systèmes à grand nombre de particules dont la dynamique est due à des forces externes, internes et à l’interaction entre ces particules. Cependant, on considère différentes échelles. On voyage ainsi du niveau quantique des atomes au niveau macroscopique des étoiles, et l’on voit que des différences apparaissent bien que certaines propriétés soient conservées. Dans ce voyage, on croise le chemin de diverses applications telles que l’astrophysique, les plasmas,les s
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7

Gracar, Peter. "Random interacting particle systems." Thesis, University of Bath, 2018. https://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.761028.

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Анотація:
Consider the graph induced by Z^d, equipped with uniformly elliptic random conductances on the edges. At time 0, place a Poisson point process of particles on Z^d and let them perform independent simple random walks with jump probabilities proportional to the conductances. It is well known that without conductances (i.e., all conductances equal to 1), an infection started from the origin and transmitted between particles that share a site spreads in all directions with positive speed. We show that a local mixing result holds for random conductance graphs and prove the existence of a special pe
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8

Deshayes, Aurélia. "Modèles de croissance aléatoire et théorèmes de forme asymptotique : les processus de contact." Thesis, Université de Lorraine, 2014. http://www.theses.fr/2014LORR0168/document.

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Анотація:
Cette thèse s'inscrit dans l'étude des systèmes de particules en interaction et plus précisément dans celle des modèles de croissance aléatoire qui représentent un quantité qui grandit au cours du temps et s'étend sur un réseau. Ce type de processus apparaît naturellement quand on regarde la croissance d'un cristal ou bien la propagation d'une épidémie. Cette dernière est bien modélisée par le processus de contact introduit en 1974 par Harris. Le processus de contact est un des plus simples systèmes de particules en interaction présentant une transition de phase et l'on connaît maintenant bien
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9

Wang, Hao Carleton University Dissertation Mathematics and Statistics. "Interacting branching particle systems and superprocesses." Ottawa, 1995.

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10

Deshayes, Aurélia. "Modèles de croissance aléatoire et théorèmes de forme asymptotique : les processus de contact." Electronic Thesis or Diss., Université de Lorraine, 2014. http://www.theses.fr/2014LORR0168.

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Анотація:
Cette thèse s'inscrit dans l'étude des systèmes de particules en interaction et plus précisément dans celle des modèles de croissance aléatoire qui représentent un quantité qui grandit au cours du temps et s'étend sur un réseau. Ce type de processus apparaît naturellement quand on regarde la croissance d'un cristal ou bien la propagation d'une épidémie. Cette dernière est bien modélisée par le processus de contact introduit en 1974 par Harris. Le processus de contact est un des plus simples systèmes de particules en interaction présentant une transition de phase et l'on connaît maintenant bien
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11

Stoica, Cristina. "Particle systems with quasihomogeneous interaction." Thesis, National Library of Canada = Bibliothèque nationale du Canada, 2000. http://www.collectionscanada.ca/obj/s4/f2/dsk2/ftp02/NQ52774.pdf.

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12

Ahmed, Hashim Abdalla. "Particle interactions in multicomponent systems." Thesis, University of Bath, 1989. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.235560.

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13

Xu, Lihu. "Nonlinear problems in infinite interacting particle systems." Thesis, Imperial College London, 2007. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.444071.

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14

Moreira, Adriana Gomes. "Nonequilibrium phase transitions in interacting particle systems." Universidade Federal de Minas Gerais, 1996. http://hdl.handle.net/1843/BUOS-9GJQ9K.

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Анотація:
We study the two-dimensional contact process (CP) with quenched disorder in the form of random dilution of a fraction x. A qualitative picture of the phase diagram is obtained through mean-¯eld theory (MFT). Monte Carlo simulations show that the relative shift in the critical point, [¸c(x)¡¸c(0)]=¸c(0) is in reasonable agreement with MFT, for small values of x. As expected on the basis of the Harris criterion, the critical exponents governing the order parameter and the survival probability take values different from those of the pure model. We also study the critical spreading dynamics of the
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15

Tran, Hong Quan. "Cutoff phenomenon for some interacting particle systems." Electronic Thesis or Diss., Université Paris sciences et lettres, 2024. http://www.theses.fr/2024UPSLD007.

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Анотація:
Sur un espace d’états fini, une chaîne de Markov irréductible à temps continu converge vers sa mesure stationnaire unique, ou en d’autres termes, se mélange. La convergence est mesurée par rapport à la distance en variation totale. Dans la théorie moderne des chaînes de Markov, nous nous intéressons aux chaînes où l’espace d’états devient grand. En étudiant certains modèles de mélange de cartes, Aldous, Diaconis et Shashahani ont découvert le phénomène remarquable maintenant connu sous le nom de cutoff : lorsque l’espace d’états devient grand, la distance entre la chaîne et l’équilibre reste p
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16

Blanco-Mantecon, Mireia. "Interactions, particle size and surface effects in magnetic nanoparticle systems." Thesis, Bangor University, 2000. https://research.bangor.ac.uk/portal/en/theses/interactions-particle-size-and-surface-effects-in-magnetic-nanoparticle-systems(2f7d3ef7-ef4c-43b0-b3ad-9e5c68f629e5).html.

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Анотація:
This work has involved the study of the magnetic behaviour of small magnetic nanoparticle systems. Due to the reduced size of magnetic nanoparticles they present distinctive properties, such as size and surface effects, that have been analysed in this work, as well as the effect of interactions in such systems. The samples chosen for the study were magnetite particles in the form of a ferrofluid and Co nanoclusters in a nonmagnetic matrix of Cu. Both systems present very narrow particle size distributions, which facilitates the interpretation of the data. The samples have been subjected to bas
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17

Stamm, Matthew T. "Particle Dynamics and Particle-Cell Interaction in Microfluidic Systems." Diss., The University of Arizona, 2013. http://hdl.handle.net/10150/308886.

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Particle-laden flow in a microchannel resulting in aggregation of microparticles was investigated to determine the dependence of the cluster growth rate on the following parameters: suspension void fraction, shear strain rate, and channel-height to particle-diameter ratio. The growth rate of an average cluster was found to increase linearly with suspension void fraction, and to obey a power-law relationships with shear strain rate as S^0.9 and channel-height to particle-diameter ratio as (h/d)^-3.5. Ceramic liposomal nanoparticles and silica microparticles were functionalized with antibodies t
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18

Fernández, Lafuerza Luis Gonzalo. "Fluctuations in interacting-particle systems: a theoretical study." Doctoral thesis, Universitat de les Illes Balears, 2012. http://hdl.handle.net/10803/104264.

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Анотація:
La presente tesis doctoral, se centra en el desarrollo de métodos matemáticos para el estudio de procesos estocásticos de interés en física y otras ciencias naturales. Fundamentalmente se consideran sistemas de particulas en interacción, prestando especial atención al efecto de la heterogeneidad entre los componentes del sistema, así como el retraso en las interacciones. También se estudian propiedades de sincronización en sistemas de elemenentos excitables no identicos. Se desarrollan diversos métodos analíticos para estudiar este tipo de sistemas y se derivan diversos resultados mátema
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19

Fearon, Michael. "Theoretical studies of strongly interacting fine particle systems." Thesis, University of Central Lancashire, 1990. http://clok.uclan.ac.uk/20347/.

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Анотація:
A theoretical analysis of the time dependent behaviour of a system of fine magnetic particles as a function of applied field and temperature was carried out. The model used was based on a theory assuming Neel relaxation with a distribution of particle sizes. This theory predicted a linear variation of 5max with temperature and a finite intercept, which is not reflected by experimental observations. The remanence curves of strongly interacting fine-particle systems were also investigated theoretically. It was shown that the Henkel plot of the dc demagnetisation remanence vs the isothermal reman
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20

Klauß, Tobias. "An Interacting Particle System for Collective Migration." Doctoral thesis, Saechsische Landesbibliothek- Staats- und Universitaetsbibliothek Dresden, 2008. http://nbn-resolving.de/urn:nbn:de:bsz:14-ds-1228074229228-77328.

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Анотація:
Kollektive Migration und Schwarmverhalten sind Beispiele für Selbstorganisation und können in verschiedenen biologischen Systemen beobachtet werden, beispielsweise in Vogel-und Fischschwärmen oder Bakterienpopulationen. Im Zentrum dieser Arbeit steht ein räumlich diskretes und zeitlich stetiges Model, welches das kollektive Migrieren von Individuen mittels eines stochastischen Vielteilchensystems (VTS) beschreibt und analysierbar macht. Das konstruierte Modell ist in keiner Klasse gut untersuchter Vielteilchensysteme enthalten, sodass der größte Teil der Arbeit der Entwicklung von Methoden zur
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21

Emerson, Zachery Ian. "Particle and bubble interactions in flotation systems." Auburn, Ala., 2007. http://repo.lib.auburn.edu/2007%20Spring%20Dissertations/EMERSON_ZACHERY_45.pdf.

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22

Garrod, Barnaby G. "One-dimensional interacting particle systems as Pfaffian point processes." Thesis, University of Warwick, 2016. http://wrap.warwick.ac.uk/81054/.

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Анотація:
A wide class of one-dimensional continuous-time discrete-space interacting particle systems are shown to be Pfaffian point processes at fixed times with kernels characterised by the solutions to associated two-dimensional ODEs. The models comprise instantaneously coalescing or annihilating random walks with fully spatially inhomogeneous jump rates and deterministic initial conditions, including additional pairwise immigration or branching in the pure interaction regimes. We formulate convergence of Pfaffian point processes via their kernels, enabling investigation of diffusive scaling limits,
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23

Rau, Sebastian [Verfasser]. "Optimal Control of interacting Quantum Particle Systems / Sebastian Rau." München : Verlag Dr. Hut, 2013. http://d-nb.info/1042308470/34.

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24

Kerner, Joachim Friedrich. "Interacting many-particle systems on general compact quantum graphs." Thesis, University of London, 2013. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.603454.

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Анотація:
In this thesis, we discuss many-particle systems on general compact quantum graphs. The results cover systems of distinguishable particles as well as systems of bosons or fermions. The main focus lies on the introduction of many-particle interactions in order to establish a useful model regarding many-particle quantum chaos 811d onc-dimensional Bose-Einstein condensation (BEC). Using suitable quadratic forms, we will characterise self-adjoint realisations of the two- and many-particle Laplacian which incorporate two different types of interactions, i.e. singular interactions localised at the v
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25

Matveev, Konstantin. "q-deformed Interacting Particle Systems, RSKs and Random Polymers." Thesis, Harvard University, 2016. http://nrs.harvard.edu/urn-3:HUL.InstRepos:33493453.

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Анотація:
We introduce and study four $q$-randomized Robinson--Schensted--Knuth (RSK) insertion tableau dynamics. Each of them is a discrete time Markov dynamics on two-dimensional interlacing particle arrays (these arrays are in a natural bijection with semistandard Young tableaux). For $0<q<1$ each dynamics provides a two-dimensional extension of the corresponding one-dimensional exactly solvable random dynamics of interacting particles. We prove that our dynamics act nicely on a certain class of probability measures on arrays, namely, on $q$-Whittaker processes. For $q=0$ these dynamics degenerate
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26

Bashiri, Kaveh [Verfasser]. "Gradient Flows, Metastability and Interacting Particle Systems / Kaveh Bashiri." Bonn : Universitäts- und Landesbibliothek Bonn, 2020. http://d-nb.info/1218301406/34.

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27

Oduwole, Olayinka. "Particle interactions in a magnetophoretic system." Thesis, University of Oxford, 2016. https://ora.ox.ac.uk/objects/uuid:f01cbb33-4dd4-4057-8891-7097e6493bce.

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Анотація:
The continuous flow separation of magnetic particles from a mixture of particles could improve the performance of magnetic bead based assays but the formation of agglomerates limit the separation efficiency. Bead agglomerates are formed as a result of magnetic binding forces while the hydrodynamic fluid environment strongly influences their movement. The ability to predict the interaction between nearby beads will help to determine a threshold separation distance which will be recommended for use when obtaining measurement within a magnetic bead assay for a specified time interval. The introdu
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28

Cepeda, Chiluisa Eduardo. "Contribution à l'étude probabiliste et numérique d'équations homogènes issues de la physique statistique : coagulation-fragmentation." Phd thesis, Université Paris-Est, 2013. http://tel.archives-ouvertes.fr/tel-00952117.

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Анотація:
Cette thèse est consacrée à l'étude de systèmes subissant des coagulations et fragmentations successives. Dans le cas déterministe, on travaille avec des solutions mesures de l'équation de coagulation - multifragmentation. On étudie aussi la contrepartie stochastique de ces systèmes : les processus de coalescence - multifragmentation qui sont des processus de Markov à sauts. Dans un premier temps, on étudie le phénomène de coagulation seul. D'un côté, l'équation de Smoluchowski est une équation intégro-différentielle déterministe. D'un autre côté, on considère le processus stochastique connu s
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29

Birmpa, Panagiota. "Quantification of mesoscopic and macroscopic fluctuations in interacting particle systems." Thesis, University of Sussex, 2018. http://sro.sussex.ac.uk/id/eprint/76622/.

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Анотація:
The purpose of this PhD thesis is to study mesoscopic and macroscopic fluctuations in Interacting Particle Systems. The thesis is split into two main parts. In the first part, we consider a system of Ising spins interacting via Kac potential evolving with Glauber dynamics and study the macroscopic motion of an one-dimensional interface under forced displacement as the result of large scale fluctuations. In the second part, we consider a diffusive system modelled by a Simple Symmetric Exclusion Process (SSEP) which is driven out of equilibrium by the action of current reservoirs at the boundary
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30

Liang, Shu-Chien. "Studies on hydrodynamic interactions between particles in liquid-solid systems /." The Ohio State University, 1995. http://rave.ohiolink.edu/etdc/view?acc_num=osu1487930304685987.

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31

Taggi, Lorenzo. "Absorptionsphasenubergang für Irrfahrten mit Aktivierung und stochastische Zelluläre Automaten." Doctoral thesis, Universitätsbibliothek Leipzig, 2016. http://nbn-resolving.de/urn:nbn:de:bsz:15-qucosa-208644.

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Анотація:
This thesis studies two Markov processes describing the evolution of a system of many interacting random components. These processes undergo an absorbing-state phase transition, i.e., as one variates the parameter values, the process exhibits a transition from a convergence regime to one of the absorbing-states to an active regime. In Chapter 2 we study Activated Random Walk, which is an interacting particle system where the particles can be of two types and their number is conserved. Firstly, we provide a new lower bound for the critical density on Z as a function of the jump distribution and
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32

Pérez, Jérôme. "Stabilite des systemes de particules en interactions gravitationnelle." Paris 7, 1995. http://www.theses.fr/1995PA077067.

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Анотація:
L'etude de la dynamique et de la stabilite des systemes auto-gravitants est abordee sous le jour nouveau de la mecanique symplectique. D'un point de vue analytique une approche de la stabilite par des methodes d'energie permet de simplifier un certain nombre de resultats classiques, de mettre sur pied un schema d'investigation des problemes ouverts dans ce domaine, et de proposer des conjectures sur la stabilite des systemes auto-gravitants non collisionels spheriques. La mise en uvre de simulations numeriques de tels systemes sur une connexion machine permet alors de confirmer ces conjectures
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33

Chung, Eunhyea. "Colloidal particle-surface interactions in atmospheric and aquatic systems." Diss., Georgia Institute of Technology, 2011. http://hdl.handle.net/1853/43728.

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Анотація:
Colloidal particles suspended in a liquid or gas phase often interact with a solid-liquid or solid-gas interface. In this study, experimental data through atomic force microscopy and neutron reflectometry and theoretical results of colloidal particle-surface interactions were obtained and compared. Atmospheric and aquatic environments were considered for the interactions of microbial colloidal particles and nano-sized silica particles with planar surfaces. Spores of Bacillus thuringiensis, members of the Bacillus cereus group, were examined as the microbial particles, simulating the pathogens
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34

Restrepo, Lopez Ricardo. "Topics in spatial and dynamical phase transitions of interacting particle systems." Diss., Georgia Institute of Technology, 2011. http://hdl.handle.net/1853/42729.

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Анотація:
In this work we provide several improvements in the study of phase transitions of interacting particle systems: - We determine a quantitative relation between non-extremality of the limiting Gibbs measure of a tree-based spin system, and the temporal mixing of the Glauber Dynamics over its finite projections. We define the concept of 'sensitivity' of a reconstruction scheme to establish such a relation. In particular, we focus on the independent sets model, determining a phase transition for the mixing time of the Glauber dynamics at the same location of the extremality threshold of the simpl
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35

Louis, Pierre-Yves, and Jean-Baptiste Rouquier. "Time-to-Coalescence for interacting particle systems : parallel versus sequential updating." Universität Potsdam, 2009. http://opus.kobv.de/ubp/volltexte/2011/4945/.

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Анотація:
Studying the influence of the updating scheme for MCMC algorithm on spatially extended models is a well known problem. For discrete-time interacting particle systems we study through simulations the effectiveness of a synchronous updating scheme versus the usual sequential one. We compare the speed of convergence of the associated Markov chains from the point of view of the time-to-coalescence arising in the coupling-from-the-past algorithm. Unlike the intuition, the synchronous updating scheme is not always the best one. The distribution of the time-to-coalescence for these spatially extended
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36

Mujal, Torreblanca Pere. "Interacting ultracold few-boson systems." Doctoral thesis, Universitat de Barcelona, 2019. http://hdl.handle.net/10803/668191.

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Анотація:
In this thesis, we study the physical properties of several ultracold few-boson systems depending on the interactions between their constituents. Nowadays, experimentally, it is possible to have great control with high precision over the geometry and the interactions between the particles, making them an excellent setup to test directly the principles of quantum mechanics. A very interesting point is to study the evolution of their properties with the number of particles. The theoretical study of these systems pretends to microscopically understand the current experimental results and give sup
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37

Kemgang, Ebenezer. "Dipolar particles under external fields." Electronic Thesis or Diss., Université de Lorraine, 2022. https://docnum.univ-lorraine.fr/ulprive/DDOC_T_2022_0099_KEMGANG.pdf.

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Анотація:
Ce travail de thèse théorique vise à comprendre l'influence des stimuli externes (champ magnétique, gravité, confinement) ainsi que des effets thermiques sur l'auto-assemblage d'un ensemble de particules dipolaires magnétiques. L'intérêt fondamental des particules dipolaires réside sur le caractère anisotropique et de longue portée des interactions dipôle-dipôle. Différentes échelles de grandeur caractérisent ces systèmes (moléculaire, colloïdale et granulaire). Nos modèles concernent des sphères dures dipolaires, systèmes de référence en physique de la matière condensée. Un premier objectif v
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38

Brackstone, Mark Andrew. "Dynamic properties of models of modulated systems in condensed matter." Thesis, University of Southampton, 1989. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.255764.

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39

Ghezzi, Flavio. "Experimental studies of two-dimensional colloidal systems." Thesis, Queen's University Belfast, 1998. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.266705.

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40

Spiteri, Ludovic. "Self-assembly of dipolar particles." Thesis, Université de Lorraine, 2018. http://www.theses.fr/2018LORR0261/document.

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Анотація:
Cette thèse couvre l'auto-assemblage de particules dipolaires (magnétiques/électriques). Ces systèmes sont abondants en physique de la matière condensée (molécules et nanoparticules magnétiques, particules colloïdales magnétiques, bactérie magnétotactique, etc.). Sur un plan fondamental, ils représentent un défi important en raison de l'anisotropie et de la longue portée de l'interaction de paire. Le principal objectif de ce travail de recherche est de prédire les microstructures de ces systèmes en tenant compte de façon adéquate de l'interaction complexe dipôle-dipôle ainsi que des effets sté
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41

Philipowski, Robert. "Stochastic interacting particle systems and nonlinear partial differential equations from fluid mechanics." [S.l.] : [s.n.], 2007. http://deposit.ddb.de/cgi-bin/dokserv?idn=986005622.

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42

Patil, Deepak C. "Particle Interactions in Industrial Granular Systems: Experiments, Theory, and Simulations." Research Showcase @ CMU, 2017. http://repository.cmu.edu/dissertations/915.

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Анотація:
Granular media continue to be among the most manipulated materials found in various industries. Particle interactions in granular flow has fundamental importance in analyzing the performance of a wide range of key engineering applications such as hoppers, tumblers, and mixers etc. In spite of such ubiquitous presence, till date, our understanding of the granular flow is very limited. This restricts our ability to design efficient and optimal granular processing equipment. Additionally, the existing design abilities are also constrained by the number of particles to be analyzed, where, a typica
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43

Rawling, M. Carl. "Particle-water interactions of hydrophobic organic micropollutants in marine systems." Thesis, University of Plymouth, 1998. http://hdl.handle.net/10026.1/1926.

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An understanding of the reactivity of hydrophobic organic micropollutants (HOMs) is of paramount importance to water quality managers because of their toxicity, persistence, and liability to bioaccumulate. In this study, the role played by the main estuarine variables (organic matter, suspended particulate matter [SPM], particle type and salinity) on HOM behaviour was investigated by employing samples from estuaries with different geochemical signatures (Chupa, Russia, and the Dart, Plym, Beaulieu and Carnon, U K ) . A laboratory-based technique was developed for the determination of the solub
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44

Spiteri, Ludovic. "Self-assembly of dipolar particles." Electronic Thesis or Diss., Université de Lorraine, 2018. http://www.theses.fr/2018LORR0261.

Повний текст джерела
Анотація:
Cette thèse couvre l'auto-assemblage de particules dipolaires (magnétiques/électriques). Ces systèmes sont abondants en physique de la matière condensée (molécules et nanoparticules magnétiques, particules colloïdales magnétiques, bactérie magnétotactique, etc.). Sur un plan fondamental, ils représentent un défi important en raison de l'anisotropie et de la longue portée de l'interaction de paire. Le principal objectif de ce travail de recherche est de prédire les microstructures de ces systèmes en tenant compte de façon adéquate de l'interaction complexe dipôle-dipôle ainsi que des effets sté
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45

Olsson, Martin Wexö. "GPU based particle system." Thesis, Blekinge Tekniska Högskola, Sektionen för datavetenskap och kommunikation, 2010. http://urn.kb.se/resolve?urn=urn:nbn:se:bth-3761.

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Анотація:
GPGPU (General purpose computing on graphics processing unit) is quite common in today&apos;s modern computer games when doing heavy simulation calculations like game physics or particle systems. GPU programming is not only used in games but also in scientific research when doing heavy calculations on molecular structures and protein folding etc. The reason why you use the GPU for these kinds of tasks is that you can gain an incredible speedup in performance to your application. Previous research shows that particle systems scale very well to the GPU architecture. When simulating very large pa
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46

Ezanno, François. "Systèmes de particules en interaction et modèles de déposition aléatoire." Phd thesis, Aix-Marseille Université, 2012. http://tel.archives-ouvertes.fr/tel-00796271.

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Анотація:
Les résultats de cette thèse sont composés de trois parties relativement indépendantes. Dans la première partie, nous reprenons le problème de la définition d'une classe de processus markoviens à une infinité de coordonnées (systèmes de particules en interaction). Nous en proposons une construction ne mettant en jeu ni d'analyse fonctionnelle (ou peu), ni de problème de martingale. Ceci est fait en utilisant des outils probabilistes élémentaires, notamment des couplages adéquats. On fait pour cela une certaine hypothèse sur les taux individuels de transition, qui a été déjà exploitée dans la c
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47

Putan, Diana [Verfasser]. "Uniqueness of equilibrium states in some models of interacting particle systems / Diana Putan." Bielefeld : Universitätsbibliothek Bielefeld, 2014. http://d-nb.info/1057957062/34.

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48

Borrello, Davide. "Interacting particle systems : stochastic order, attractiveness and random walk on small world grahs." Rouen, 2009. http://www.theses.fr/2009ROUES032.

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Анотація:
Le sujet principal de la thèse sont les systèmes de particules en interaction, qui sont des classes de processus spatio-temporels. Ces systèmes décrivent l'évolution de particules en interaction les unes avec les autres sur un espace discret fini ou infini. Dans la partie I, nous examinons l'ordre stochastique dans un système de particules avec multiples naissances, morts et sauts sur l'espace d-dimensionnel à coordonnées entières. Nous donnons des applications pour des modèles biologiques de diffusion d'épidémies et de systèmes de dynamiques de métapopulations. Dans la partie II, nous analyso
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49

BORRELLO, DAVIDE. "Interacting particle systems: stochastic order, attractiveness and random walks on small world graphs." Doctoral thesis, Università degli Studi di Milano-Bicocca, 2009. http://hdl.handle.net/10281/7467.

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Анотація:
The main subject of the thesis is concerned with interacting particle systems, which are classes of spatio-temporal stochastic processes describing the evolution of particles in interaction with each other. The particles move on a finite or infinite discrete space and on each element of this space the state of the configuration is integer valued. Configurations of particles evolve in continuous time according to a Markov process. Here the space is either the infinite deterministic d-dimensional lattice or a random graph given by the finite d-dimensional torus with random matchings. In Part
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50

Dworaczek, Guera Charlie. "Analyse asymptotiques d'intégrales multiples : au-delà des beta-ensembles classiques." Electronic Thesis or Diss., Lyon, École normale supérieure, 2024. http://www.theses.fr/2024ENSL0036.

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Анотація:
Cette thèse vise à étendre les techniques mathématiques qui permettent d’extraire le comportement asymptotique de certaines intégrales multiples quand le nombre d’intégrales tend vers l’infini. Un cas très bien compris est celui de la fonction de partition des beta-ensembles classiques. Les techniques probabilistes de grandes déviations et d’analyse des équations de boucles forment l’arsenal classique pour son étude et permettent de comprendre son comportement asymptotique dans une large généralité. Des généralisations non-triviales de cette intégrale multiple sont étudiés dans ce manuscrit: l
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