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Dissertations / Theses on the topic 'Fluctuation-dissipation theorem'

Author: Grafiati

Published: 4 June 2021

Last updated: 1 February 2022

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1

Siemer, Bernd, Viktor Holubec, Petr Chvosta, and Philipp Maass. "Fluctuation dissipation theorem and Onsager coefficients in driven diffusion systems." Diffusion fundamentals 24 (2015) 47, S. 1, 2015. https://ul.qucosa.de/id/qucosa%3A14567.

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2

Siemer, Bernd, Viktor Holubec, Petr Chvosta, and Philipp Maass. "Fluctuation dissipation theorem and Onsager coefficients in driven diffusion systems." Universitätsbibliothek Leipzig, 2016. http://nbn-resolving.de/urn:nbn:de:bsz:15-qucosa-198659.

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3

Brossault, Marc-Antoine. "Suivi temporel de la dynamique des structures : apports du théorème fluctuation-dissipation et de la dynamique lente pour l'évaluation de l'intégrité des structures de génie civil." Thesis, Université Grenoble Alpes (ComUE), 2017. http://www.theses.fr/2017GREAU031/document.

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Soumise à une sollicitation sismique importante, une structure de génie civil peut être endommagée. Cela se traduit par l'apparition de fissures et donc une réduction de ses propriétés élastiques de la structure. Cependant, dans le cas d'un événement sismique d'amplitude inférieure, la variation observée est seulement transitoire. Elle consiste en une perturbation brutale de la fréquence et de l'amortissement suivie d'un recouvrement lent vers leurs valeurs initiales. Ce phénomène non linéaire de relaxation est appelé Dynamique Lente. Il s'explique par la fermeture progressive des fissures ini

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4

Graf, Daniel [Verfasser], and Christian [Akademischer Betreuer] Ochsenfeld. "Development of efficient electronic-structure methods based on the adiabatic-connection fluctuation-dissipation theorem and Møller–Plesset perturbation theory / Daniel Graf ; Betreuer: Christian Ochsenfeld." München : Universitätsbibliothek der Ludwig-Maximilians-Universität, 2021. http://d-nb.info/123217629X/34.

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5

Clark, Matthew Taylor. "The driven and stochastic dynamics of micro and nanoscale cantilevers in viscous fluid and near a solid boundary." Diss., Virginia Tech, 2008. http://hdl.handle.net/10919/29411.

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Micro and nanoscale systems are rapidly evolving to improve the resolution of experimental measurements. Experiments involving such small scale devices are difficult and expensive, and the available analytical theory to describe their dynamics is idealized. The dynamics of microscopic cantilevers in fluid are complicated and include significant contributions from many sources in an actual experiment. Some examples are: complex cantilever geometries, near-wall effects, thermal and external actuation techniques, and a variety of measurement techniques. Numerical simulations are a powerful ap

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6

Pedurand, Richard. "Instrumentation for Thermal Noise Spectroscopy." Thesis, Lyon, 2019. http://www.theses.fr/2019LYSE1356.

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La résolution des interféromètres gravitationnels est limitée par le mouvement Brownien - ou bruit thermique - de leurs miroirs dans la partie centrale de leur bande de détection, entre 10Hz et 1kHz. La répartition en fréquence de ce bruit thermique est dictée par les mécanismes de dissipation d'énergie mécanique à l'origine de cette vibration aléatoire, en accord avec le théorème fluctuation-dissipation. Cette dissipation provient principalement des revêtements optiques déposés sur les miroirs pour leur donner leur réflectivité. Dans le but de réduire le bruit thermique, une nouvelle générati

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7

Beuerle, Matthias [Verfasser], and Christian [Akademischer Betreuer] Ochsenfeld. "Development of low-scaling methods to calculate ground state energies and analytical gradients based on the adiabatic-connection fluctuation-dissipation theorem / Matthias Beuerle ; Betreuer: Christian Ochsenfeld." München : Universitätsbibliothek der Ludwig-Maximilians-Universität, 2019. http://d-nb.info/1190563657/34.

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8

Robbins, Brian Alan. "The Correlated Dynamics of Micron-Scale Cantilevers in a Viscous Fluid." Diss., Virginia Tech, 2014. http://hdl.handle.net/10919/51090.

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A number of microcantilever systems of fundamental importance are explored using theoretical and numerical methods to quantify and provide physical insights into the dynamics of experimentally accessible systems that include a variety of configurations and viscous fluids. It is first shown that the correlated dynamics of both a laterally and vertically offset cantilever pair can be accurately predicted by numerical simulations. This is verified by comparing the correlated dynamics yielded by numerical simulations with experimental measurement. It is also demonstrated that in order to obtain th

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9

Caussarieu, Aude. "Propriétés dynamiques de la transition de Fréedericksz et vieillissement au point critique." Phd thesis, Ecole normale supérieure de lyon - ENS LYON, 2012. http://tel.archives-ouvertes.fr/tel-00790177.

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Le vieillissement physique est un sujet très actif en physique statistique car il ouvre la perspective d'une généralisation de la physique statistique à l'équilibre à des cas faiblement hors équilibre. Dans ce contexte où d'importants travaux ont été réalisés sur les polymères et les verres de spin, des travaux théoriques ont montré l'intérêt que pouvait apporter l'étude de système subissant une transition de phase du second ordre, les ingrédients théoriques étant plus simples. Nous avons donc étudié dans le détail la transition de Fréedericksz dans un cristal liquide qui est décrite par une t

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10

Ghosh, Santunu. "Study on the origin of 1/f in bulk acoustic wave resonators." Thesis, Besançon, 2014. http://www.theses.fr/2014BESA2046/document.

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Depuis quelques décennies, la technologie de contrôle de la fréquence a été au coeur de l'électronique des tempsmodernes grâce à son vaste domaine d'applications dans les systèmes de communication, les ordinateurs, les systèmesde navigation ou de défense militaire. Les dispositifs temps-fréquence fournissent des stabilités de fréquence et despuretés spectrales élevées dans le domaine de la stabilité court-terme. L'amélioration de la performance de cesdispositifs reste un grand défi pour les chercheurs. La réduction du bruit afin d'augmenter cette stabilité court-terme etd'éviter les commutatio

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11

Boedecker, Geesche. "Resonance Fluorescence in a Photonic Crystal." Phd thesis, Universität Potsdam, 2013. http://opus.kobv.de/ubp/volltexte/2014/6959/.

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The problem under consideration in the thesis is a two level atom in a photonic crystal and a pumping laser. The photonic crystal provides an environment for the atom, that modifies the decay of the exited state, especially if the atom frequency is close to the band gap. The population inversion is investigated als well as the emission spectrum. The dynamics is analysed in the context of open quantum systems. Due to the multiple reflections in the photonic crystal, the system has a finite memory that inhibits the Markovian approximation. In the Heisenberg picture the equations of motion f

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12

Gomez-Solano, Juan Rubén. "Nonequilibrium fluctuations of a Brownian particle." Phd thesis, Ecole normale supérieure de lyon - ENS LYON, 2011. http://tel.archives-ouvertes.fr/tel-00680302.

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This thesis describes an experimental study on fluctuations of a Brownian particle immersed in a fluid, confined by optical tweezers and subject to two different kinds of non-equilibrium conditions. We aim to gain a rather general understanding of the relation between spontaneous fluctuations, linear response and total entropy production for processes away from thermal equilibrium. The first part addresses the motion of a colloidal particle driven into a periodic non-equilibrium steady state by a nonconservative force and its response to an external perturbation. The dynamics of the system is

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13

Bérut, Antoine. "Fluctuations and Interactions of Brownian particles in multiple Optical Traps." Thesis, Lyon, École normale supérieure, 2015. http://www.theses.fr/2015ENSL1003/document.

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Nous avons étudié expérimentalement les fluctuations de micro-particules browniennes piégées à l'aide de pinces optiques dans un réseau de puits de potentiels voisins. Nous donnons un descriptif général du montage expérimental, puis détaillons quatre utilisations différentes du système. Nous avons d'abord utilisé une unique particule dans un double puits de potentiel pour modéliser un système mémoire à deux niveaux, avec lequel nous avons vérifié le principe de Landauer sur le coût minimal en énergie pour l'effacement d'un bit d'information. Nous avons également appliqué une version détaillée

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14

Mahajan, Salil. "CCM3 as applied to an idealized all land zonally symmetric planet, Terra Blanda 3." Texas A&M University, 2004. http://hdl.handle.net/1969.1/1422.

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Community Climate Model 3 (CCM3) is run on an idealized all land zonally symmetric planet (Terra Blanda) with no seasonality, no snow and fixed soil moisture to obtain a stationary time series effectively much longer than conventional runs with geography and seasons. The surface temperature field generated is studied to analyze the spatial and temporal spectra, estimate the length scale and time scale of the model, and test the linearity of response to periodic and steady heat source forcings. The length scale of the model is found to be in the range of 1000-2000 km and the time scale is estim

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15

Alemany, i. Arias Anna. "Dynamic force spectroscopy and folding kinetics in molecular systems." Doctoral thesis, Universitat de Barcelona, 2014. http://hdl.handle.net/10803/284197.

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Codification of genetic information; regulation of gene expression; transport of nutrients inside cells; immune protection against infectious agents; transduction of external signals... These are some of the crucial processes that take place in living organisms at the molecular level. A deep understanding of how these phenomena occur is vital to get a precise knowledge of the laws governing the microscopic world and understand, prevent and even find cures for many illnesses with an origin in the molecular scale. Single-molecule experiments emerge as a powerful and versatile tool to investig

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16

Gomes, Joaquim António Maximiano. "Curvature perturbations from thermal inflation." Master's thesis, 2020. http://hdl.handle.net/10316/93899.

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Dissertação de Mestrado em Física apresentada à Faculdade de Ciências e Tecnologia<br>Um período de inflação no início da história cósmica é agora tomado como paradigmático, visto este eliminar a aparente forte dependência da cosmologia padrão nas suas condições iniciais. Além disso, consegue explicar as pequenas heterogeneidades da radiação cósmica de fundo. Para além da época principal de inflação, algumas teorias supersimétricas preveem uma classe de campos escalares com um potencial extremamente plano, conhecidos como flatões. Estes campos podem levar a cabo um período secundário de inflaç

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17

Malcolm, Nathan Patrick. "Simulation of a plasmonic nanowire waveguide." Thesis, 2009. http://hdl.handle.net/2152/ETD-UT-2009-05-73.

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In this work a Finite Difference Time Domain (FDTD) simulation is employed to explore local field enhancement, plasmonic coupling, and charge distribution patterns. This 3D simulation calculates the magnetic and electric field components in a large matrix of Yee cells using Maxwell’s equations. An absorbing boundary condition is included to eliminate reflection back into the simulation chamber, and a sample system of cells is checked for convergence. In the specific simulations considered here, a laser pulse of single wavelength is incident on a silicon substrate, travels through an embedded Z

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