Дисертації з теми "Random motion in random media"
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Jaruwatanadilok, Sermsak. "Optical wave propagation and imaging in descrete random media /." Thesis, Connect to this title online; UW restricted, 2003. http://hdl.handle.net/1773/5839.
Повний текст джерелаWu, Ying. "Effective medium theory for elastic metamaterials and wave propagation in strongly scattered random elastic media /." View abstract or full-text, 2008. http://library.ust.hk/cgi/db/thesis.pl?PHYS%202008%20WU.
Повний текст джерелаSposini, Vittoria. "A numerical study of fractional diffusion through a Langevin approach in random media." Master's thesis, Alma Mater Studiorum - Università di Bologna, 2016. http://amslaurea.unibo.it/12494/.
Повний текст джерелаWong, Chik Him. "A theoretical study on the static and dynamic transport properties of classical wave in 1D random media /." View abstract or full-text, 2007. http://library.ust.hk/cgi/db/thesis.pl?PHYS%202007%20WONG.
Повний текст джерелаMeng, Hsin-fei. "Superfluidity and random media." Thesis, Massachusetts Institute of Technology, 1993. http://hdl.handle.net/1721.1/103194.
Повний текст джерелаLessa, Pablo. "Brownian motion on stationary random manifolds." Phd thesis, Université Pierre et Marie Curie - Paris VI, 2014. http://tel.archives-ouvertes.fr/tel-00959923.
Повний текст джерелаTsay, Jhishen. "Wave scattering in random media." Diss., The University of Arizona, 1991. http://hdl.handle.net/10150/185541.
Повний текст джерелаTseng, David Tai Hee. "Restoration of random motion degraded sonar images." Thesis, University of British Columbia, 1986. http://hdl.handle.net/2429/26338.
Повний текст джерелаApplied Science, Faculty of
Electrical and Computer Engineering, Department of
Graduate
Uldry, Anne-Christine. "Two-particle excitations in random media." Thesis, University of Oxford, 2002. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.270724.
Повний текст джерелаSchwartz, Chaim. "Probing Random Media with Singular Waves." Doctoral diss., University of Central Florida, 2006. http://digital.library.ucf.edu/cdm/ref/collection/ETD/id/4252.
Повний текст джерелаPh.D.
Other
Optics and Photonics
Optics
Ortmann, Janosch. "Random matrices, large deviations and reflected Brownian motion." Thesis, University of Warwick, 2011. http://wrap.warwick.ac.uk/50020/.
Повний текст джерелаLaGatta, Tom. "Geodesics of Random Riemannian Metrics." Diss., The University of Arizona, 2010. http://hdl.handle.net/10150/193749.
Повний текст джерелаLienau, Karsten. "Spectral concentration for high contrast random media." [S.l. : s.n.], 1999. http://deposit.ddb.de/cgi-bin/dokserv?idn=956684971.
Повний текст джерелаAbabou, R. (Rachid). "Three-dimensional flow in random porous media." Thesis, Massachusetts Institute of Technology, 1988. http://hdl.handle.net/1721.1/14675.
Повний текст джерелаSousi, Perla. "Collisions and detection for random walks and Brownian motion." Thesis, University of Cambridge, 2011. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.609815.
Повний текст джерелаBerchtold, Maik. "Modelling of random porous media using Minkowski-functionals /." Zürich : ETH, 2007. http://e-collection.ethbib.ethz.ch/show?type=diss&nr=17549.
Повний текст джерелаMcLean, Alan Stuart. "Transfer matrices and image transport in random media." Thesis, Imperial College London, 1995. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.307659.
Повний текст джерелаCostaouec, Ronan, and Ronan Costaouec. "Numerical methods for homogenization : applications to random media." Phd thesis, Université Paris-Est, 2011. http://pastel.archives-ouvertes.fr/pastel-00674957.
Повний текст джерелаMiller, Sarah Judith. "Scattering of multi-frequency waves by random media." Thesis, University of Cambridge, 1987. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.256408.
Повний текст джерелаPark, Samuel. "Radiation transport in multiphase and spatially random media." Thesis, Imperial College London, 2016. http://hdl.handle.net/10044/1/45051.
Повний текст джерелаLi, Chenfeng. "Stochastic finite element modelling of elementary random media." Thesis, Swansea University, 2006. https://cronfa.swan.ac.uk/Record/cronfa42770.
Повний текст джерелаCostaouec, Ronan. "Numerical methods for homogenization : applications to random media." Thesis, Paris Est, 2011. http://www.theses.fr/2011PEST1012/document.
Повний текст джерелаIn this thesis we investigate numerical methods for the homogenization of materials the structures of which, at fine scales, are characterized by random heterogenities. Under appropriate hypotheses, the effective properties of such materials are given by closed formulas. However, in practice the computation of these properties is a difficult task because it involves solving partial differential equations with stochastic coefficients that are additionally posed on the whole space. In this work, we address this difficulty in two different ways. The standard discretization techniques lead to random approximate effective properties. In Part I, we aim at reducing their variance, using a well-known variance reduction technique that has already been used successfully in other domains. The works of Part II focus on the case when the material can be seen as a small random perturbation of a periodic material. We then show both numerically and theoretically that, in this case, computing the effective properties is much less costly than in the general case
Du, Xiangdong 1967. "Scaling laws in permeability and thermoelasticity of random media." Thesis, McGill University, 2006. http://digitool.Library.McGill.CA:80/R/?func=dbin-jump-full&object_id=102973.
Повний текст джерелаIn the first part of this work, the finite-size scaling trend to RVE of the Darcy law for Stokesian flow is studied for the case of random porous media, without invoking any periodic structure assumptions, but only assuming the microstructure's statistics to be spatially homogeneous and ergodic. By analogy to the existing methodology in thermomechanics of solid random media, the Hill-Mandel condition for the Darcy flow velocity and pressure gradient fields was first formulated. Under uniform essential and natural boundary conditions, two variational principles are developed based on minimum potential energy and complementary energy. Then, the partitioning method was applied, leading to scale dependent hierarchies on effective (RVE level) permeability. The proof shows that the ensemble average of permeability has an upper bound under essential boundary conditions and a lower bound under uniform natural boundary conditions.
To quantitatively assess the scaling convergence towards the RVE, these hierarchical trends were numerically obtained for various porosities of random disk systems, where the disk centers were generated by a planar Poisson process with inhibition. Overall, the results showed that the higher the density of random disks---or, equivalently, the narrower the micro-channels in the system---the smaller the size of RVE pertaining to the Darcy law.
In the second part of this work, the finite-size scaling of effective thermoelastic properties of random microstructures were considered from Statistical to Representative Volume Element (RVE). Similarly, under the assumption that the microstructure's statistics are spatially homogeneous and ergodic, the SVE is set-up on a mesoscale, i.e. any scale finite relative to the microstructural length scale. The Hill condition generalized to thermoelasticity dictates uniform essential and natural boundary conditions, which, with the help of two variational principles, led to scale dependent hierarchies of mesoscale bounds on effective (RVE level) properties: thermal expansion strain coefficient and stress coefficient, effective stiffness, and specific heats. Due to the presence of a non-quadratic term in the energy formulas, the mesoscale bounds for the thermal expansion are more complicated than those for the stiffness tensor and the heat capacity. To quantitatively assess the scaling trend towards the RVE, the hierarchies are computed for a planar matrix-inclusion composite, with inclusions (of circular disk shape) located at points of a planar, hard-core Poisson point field. Overall, while the RVE is attained exactly on scales infinitely large relative to microscale, depending on the microstructural parameters, the random fluctuations in the SVE response become very weak on scales an order of magnitude larger than the microscale, thus already approximating the RVE.
Based on the above studies, further work on homogenization of heterogeneous materials is outlined at the end of the thesis.
Keywords: Representative Volume Element (RVE), heterogeneous media, permeability, thermal expansion, mesoscale, microstructure.
Ooi, Kean Hong. "Light scattering in discrete random media and related materials." Thesis, University of Southampton, 1998. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.323917.
Повний текст джерелаLampshire, Gregory B. "Review of random media homogenization using effective medium theories." Thesis, Virginia Tech, 1992. http://hdl.handle.net/10919/40659.
Повний текст джерелаCalculation of propagation constants in particulate matter is an important aspect of wave propagation analysis in engineering disciplines such as satellite comnlunication, geophysical exploration, radio astronomy and material science. It is important to understand why different propagation constants produced by different theories are not applicable to a particular problem. Homogenization of the random media using effective medium theories yields the effective propagation constants by effacing the particulate, microscopic nature of the medium. The Maxwell-Gamet and Bruggeman effective medium theories are widely used but their limitations are not always well understood.
In this thesis, some of the more complex homogenization theories will only be partially derived or heuristically constructed in order to avoid unnecessary mathematical complexity which does not yield additional physical insight. The intent of this thesis is to elucidate the nature of effective medium theories, discuss the theories' approximations and gain a better global understanding of wave propagation equations. The focus will be on the Maxwell-Garnet and Bruggeman theories because they yield simple relationships and therefore serve as anchors in a sea of myriad approximations.
Master of Science
Pack, Jeong-Ki. "Numerical simulation of optical wave propagation through random media." Diss., Virginia Polytechnic Institute and State University, 1988. http://hdl.handle.net/10919/82642.
Повний текст джерелаPh. D.
Lam, Chi Ming. "Theoretical and numerical studies of electromagnetic wave scattering from random media with random rough surfaces and discrete particles /." Thesis, Connect to this title online; UW restricted, 1992. http://hdl.handle.net/1773/5982.
Повний текст джерелаSchriemer, Henry P. "Ballistic and diffusive transport of acoustic waves in random media." Thesis, National Library of Canada = Bibliothèque nationale du Canada, 1997. http://www.collectionscanada.ca/obj/s4/f2/dsk3/ftp04/nq23659.pdf.
Повний текст джерелаWan, Yanyi. "Static and dynamic transport properties of 2D elastic random media /." View abstract or full-text, 2007. http://library.ust.hk/cgi/db/thesis.pl?PHYS%202007%20WAN.
Повний текст джерелаWhite, John D. H. "A random signal ultrasonic test system for highly attenuating media." Thesis, Keele University, 1992. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.315234.
Повний текст джерелаCheng, Chung-Chieh. "Propagation of transverse optical coherence in random multiple-scattering media /." view abstract or download file of text, 1999. http://wwwlib.umi.com/cr/uoregon/fullcit?p9955916.
Повний текст джерелаTypescript. Includes vita and abstract. Includes bibliographical references (leaves 131-135). Also available for download via the World Wide Web; free to University of Oregon users. Address: http://wwwlib.umi.com/cr/uoregon/fullcit?p9955916.
Kim, Arnold D. "Optical pulse propagation, diffusion and depolarization in discrete random media /." Thesis, Connect to this title online; UW restricted, 2000. http://hdl.handle.net/1773/6770.
Повний текст джерелаGoodman, Matthew R. "Properties of Stochastic Flow and Permeability of Random Porous Media." Thesis, The University of Arizona, 2010. http://hdl.handle.net/10150/193422.
Повний текст джерелаAllen, Andrew. "A Random Walk Version of Robbins' Problem." Thesis, University of North Texas, 2018. https://digital.library.unt.edu/ark:/67531/metadc1404568/.
Повний текст джерелаFalconer, Steven. "Subdiffusive transport in non-homogeneous media and nonlinear fractional equations." Thesis, University of Manchester, 2015. https://www.research.manchester.ac.uk/portal/en/theses/subdiffusive-transport-in-nonhomogeneous-media-and-nonlinear-fractional-equations(a695fe6e-02d2-4fa1-b90b-6a57505973fc).html.
Повний текст джерелаAdil, Adam Mohamed. "Simulation of ship motion and deck-wetting due to steep random seas." Thesis, Texas A&M University, 2004. http://hdl.handle.net/1969.1/1386.
Повний текст джерелаLin, Tongling. "Path probability and an extension of least action principle to random motion." Phd thesis, Université du Maine, 2013. http://tel.archives-ouvertes.fr/tel-00795600.
Повний текст джерелаLintz, William A. "Radio frequency signal reception via distributed wirelessly networked sensors under random motion." Monterey, Calif. : Naval Postgraduate School, 2009. http://edocs.nps.edu/npspubs/scholarly/dissert/2009/Sep/09Sep%5FLintz%5FPhD.pdf.
Повний текст джерелаDissertation supervisor: McEachen, John ; Tummala, Murali. "September 2009." Description based on title screen as viewed on November 5, 2009. Author(s) subject terms: Sensor Networks, Beamforming, Random Motion, Orientation Includes bibliographical references (p. 197-203). Also available in print.
Bender, Martin. "Limit theorems for generalizations of GUE random matrices." Doctoral thesis, KTH, Matematik (Inst.), 2008. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-4799.
Повний текст джерелаDenna avhandling består av två vetenskapliga artiklar som handlar om gränsvärdessatser för slumpmatriser och måttvärda stokastiska processer. De modeller som studeras kan betraktas som generaliseringar av den gaussiska unitära ensembeln (GUE) av hermiteska n x n-matriser H=A+A†, där A är en matris vars element är oberoende, likafördelade, centrerade, komplexa normalfördelade stokastiska variabler. I artikel I betraktas ett system av växelverkande diffunderande partiklar på reella linjen, vissa specialfall av denna modell kan tolkas som egenvärdesdynamiken för matrisvärda Ornstein-Uhlenbeck-processer (Dysons brownska rörelse). Sedan tidigare är det känt att den empiriska måttprocessen konvergerar svagt mot en deterministisk måttvärd funktion och att fluktuationerna runt denna gräns, i lämplig skalning, konvergerer svagt mot en distributionsvärd gaussisk process. För en stor klass av analytiska testfunktioner härleds explicita formler för medelvärdes- och kovariansfunktionalerna för denna fluktuationsprocess. Artikel II behandlar en familj av slumpmatrisensembler som interpolerar mellan GUE och Ginibre-ensembeln, bestående av matriser A som ovan. För denna modell är egenvärdena komplexa och asymptotiskt likformigt fördelade i en ellips i komplexa planet. Skalningsgränsvärdessatser för egenvärdet med maximal realdel och för egenvärdespunktprocessen kring detta visas för ett allmänt val av interpolationsparametern i modellen. Då förhållandet mellan axlarna i den asymptotiska ellipsen är av storleksordning n-1/3 uppträder en övergångsfas mellan Airypunktprocess- och Poissonprocessbeteendena, typiska för GUE respektive Ginibre-ensembeln.
QC 20100705
Goupee, Andrew J. "Multiscale Investigation of Random Heterogenous Media in Materials and Earth Sciences." Fogler Library, University of Maine, 2010. http://www.library.umaine.edu/theses/pdf/GoupeeAJ2010.pdf.
Повний текст джерелаTartakovsky, Daniel. "Prediction of transient flow in random porous media by conditional moments." Diss., The University of Arizona, 1996. http://etd.library.arizona.edu/etd/GetFileServlet?file=file:///data1/pdf/etd/azu_e9791_1996_263_sip1_w.pdf&type=application/pdf.
Повний текст джерелаLai, Zhong Yuan [Verfasser]. "Wave dynamics in random, absorptive or laseractive media / Zhong Yuan Lai." Bonn : Universitäts- und Landesbibliothek Bonn, 2017. http://d-nb.info/1127666320/34.
Повний текст джерелаAo, Chi On 1970. "Electromagnetic wave scattering by discrete random media with remote sensing applications." Thesis, Massachusetts Institute of Technology, 2001. http://hdl.handle.net/1721.1/16782.
Повний текст джерелаIncludes bibliographical references (p. 171-182).
This electronic version was submitted by the student author. The certified thesis is available in the Institute Archives and Special Collections.
The scattering of electromagnetic waves in medium with randomly distributed discrete scatterers is studied. Analytical and numerical solutions to several problems with implications for the active and passive remote sensing of the Earth environment are obtained. The quasi-magnetostatic (QMS) solution for a conducting and permeable spheroid under arbitrary excitation is presented. The spheroid is surrounded by a weakly conducting background medium. The magnetic field inside the spheroid satisfies the vector wave equation, while the magnetic field outside can be expressed as the gradient of the Laplace solution. We solve this problem exactly using the separation of variables method in spheroidal coordinates by expanding the internal field in terms of vector spheroidal wavefunctions. The exact formulation works well for low to moderate frequencies; however, the solution breaks down at high frequency due to numerical difficulty in computing the spheroidal wavefunctions. To circumvent this difficulty, an approximate theory known as the small penetration-depth approximation (SPA) is developed. The SPA relates the internal field in terms of the external field by making use of the fact that at high frequency, the external field can only penetrate slightly into a thin skin layer below the surface of the spheroid. For spheroids with general permeability, the SPA works well at high frequency and complements the exact formulation. However, for high permeability, the SPA is found to give accurate broadband results. By neglecting mutual interactions, the QMS frequency response from a collection of conducting and permeable spheroids is also studied.
(cont.) In a dense medium, the failure to properly take into account of multiple scattering effects could lead to significant errors. This has been demonstrated in the past from extensive theoretical, numerical, and experimental studies of electromagnetic wave scattering by densely packed dielectric spheres. Here, electromagnetic wave scattering by dense packed dielectric spheroids is studied both numerically through Monte Carlo simulations and analytically through the quasi-crystalline approximation (QCA) and QCA with coherent potential (QCA-CP). We assume that the spheroids are electrically small so that single-particle scattering is simple. In the numerical simulations, the Metropolis shuffling method is used to generate realizations of configurations for non-interpenetrable spheroids. The multiple scattering problem is formulated with the volume integral equation and solved using the method of moments with electrostatic basis functions. General expressions for the self-interaction elements are obtained using the low-frequency expansion of the dyadic Green's function, and radiative correction terms are included. Results of scattering coefficient, absorption coefficient, and scattering matrix for spheroids in random and aligned orientation configurations are presented. It is shown that independent scattering approximation can give grossly incorrect results when the fractional volume of the spheroids is appreciable.
(cont.) In the analytical approach, only spheroids in the aligned configuration are solved. Low-frequency QCA and QCA-CP solutions are obtained for the average Green's function and the effective permittivity tensor. For QCA-CP, the low-frequency expansion of the uniaxial dyadic Green's function is required. The real parts of the effective permittivities from QCA and QCA-CP are compared with the Maxwell-Garnett mixing formula. ...
by Chi On Ao.
Ph.D.
Veysoglu, Murat Emre. "Direct and inverse scattering models for random media and rough sufraces." Thesis, Massachusetts Institute of Technology, 1994. http://hdl.handle.net/1721.1/17375.
Повний текст джерелаIncludes bibliographical references (p. 191-198).
by Murat Emre Veysoglu.
Ph.D.
Zhang, Jinmiao. "A Hybrid Finite Element Method for Heterogeneous Media With Random Microstructures /." The Ohio State University, 1995. http://rave.ohiolink.edu/etdc/view?acc_num=osu1487931512621134.
Повний текст джерелаSong, Yilang. "The influence of random microstructure on wave propagation through heterogeneous media." Thesis, University of Sheffield, 2015. http://etheses.whiterose.ac.uk/10160/.
Повний текст джерелаPowell, Ellen Grace. "Scaling limits of critical systems in random geometry." Thesis, University of Cambridge, 2017. https://www.repository.cam.ac.uk/handle/1810/270147.
Повний текст джерелаLhermitte, Julien. "Using coherent small angle xray scattering to measure velocity fields and random motion." Thesis, McGill University, 2011. http://digitool.Library.McGill.CA:80/R/?func=dbin-jump-full&object_id=104825.
Повний текст джерелаLa dynamique de polymères réticulés de stress, telles que celle qui compose le caoutchouc, n'est pas encore bien comprise. Une combinaison de techniques homodynes et hétérodynes de rayons x coherentes est utilisé pour mesurer les fluctuations du système, une fois étiré. La combinaison des deux techniques permet la mesure des régimes d'écoulement, ainsi que le caractère aléatoire du système. Après l'analyse des données, les résultats montrent que les mesures ont réussi à capturer cet information. La vitesse d'écoulement a été découverte de contenir une nature en fonction du temps semblable à celle de la courbe contrainte-déformation. Après la vitesse d'écoulement a été extraite, la nature aléatoire du système a été analysé. Cette motion a été découverte au hasard de ne pas être dominé par la diffusion classique, mais de certains processus aléatoires plus lents.
Uda, Kenneth O. "A qualitative approach to the existence of random periodic solutions." Thesis, Loughborough University, 2015. https://dspace.lboro.ac.uk/2134/17355.
Повний текст джерелаSukop, Michael C. "POROSITY, PERCOLATION THRESHOLDS, AND WATER RETENTION BEHAVIOR OF RANDOM FRACTAL POROUS MEDIA." UKnowledge, 2001. http://uknowledge.uky.edu/gradschool_diss/459.
Повний текст джерела