Rozprawy doktorskie na temat „Propagation”
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Braunstein, Alfredo. "Survey propagation". Doctoral thesis, SISSA, 2004. http://hdl.handle.net/20.500.11767/4250.
Pełny tekst źródłaNechayev, Yuriy Ivanovich. "Investigations into propagation mechanisms for urban radiowave propagation modelling". Thesis, University of Birmingham, 2004. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.420512.
Pełny tekst źródłaKubicek, Martin. "High dimensional uncertainty propagation for hypersonic flows and entry propagation". Thesis, University of Strathclyde, 2018. http://digitool.lib.strath.ac.uk:80/R/?func=dbin-jump-full&object_id=30780.
Pełny tekst źródłaTu, Ronghui. "Generalized Survey Propagation". Thèse, Université d'Ottawa / University of Ottawa, 2011. http://hdl.handle.net/10393/19972.
Pełny tekst źródłaMuirhead, Matthew. "Interior wave propagation". Thesis, University of Nottingham, 2003. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.289312.
Pełny tekst źródłaMikulica, Tomáš. "Light Propagation Volumes". Master's thesis, Vysoké učení technické v Brně. Fakulta informačních technologií, 2015. http://www.nusl.cz/ntk/nusl-234902.
Pełny tekst źródłaRůžička, Tomáš. "Light Propagation Volumes". Master's thesis, Vysoké učení technické v Brně. Fakulta informačních technologií, 2016. http://www.nusl.cz/ntk/nusl-255483.
Pełny tekst źródłaBertin, Michaël. "Propagation des incertitudes dans un modèle réduit de propagation des infrasons". Thesis, Cachan, Ecole normale supérieure, 2014. http://www.theses.fr/2014DENS0020/document.
Pełny tekst źródłaThe perturbation of a system can give rise to wave propagation. A classical approach to understand this phenomenon is to look for natural modes of vibration of the medium. Mathematically, finding these modes requires to seek the eigenvalues and eigenfunctions of the propagation operator. However, from a numerical point of view, the operation can be costly because the matrices can be of very large size. Furthermore, in most applications, uncertainties are inevitably associated with our model. The question then arises as to whether we should allocate significant computational resources for simulation while the accuracy of the result is not guaranteed. We propose in this thesis an approach that allows both a better understanding of the influence of uncertainties on the propagation and a significant decrease of computational costs for infrasound propagation in the atmosphere. The main idea is that all modes do not have the same importance and only a few of them is often sufficient to account for the phenomenon without a significant loss of accuracy. These modes appear to be those which are most sensitive to atmospheric disturbances. Specifically, a sensitivity analysis is used to identify the most influential structures of the atmosphere, the associated groups of modes and their associated parts of the infrasound signal. These groups of modes can be specifically targeted in a spectrum calculation with the projection of the operator onto Krylov subspaces, that allows a significant decrease of the computational cost. This method of model reduction can be applied in a statistical framework as well and estimations of the expectation and the variance of the results are carried out without a significant loss of accuracy and still with a low cost
Maxwell, Douglas Wayne. "Propagation of Camptotheca acuminata". [College Station, Tex. : Texas A&M University, 2004. http://hdl.handle.net/1969.1/454.
Pełny tekst źródłaIzquierdo, Fernández Benjamín. "Electromagnetic propagation in tunnels". Doctoral thesis, Universitat Politècnica de Catalunya, 2011. http://hdl.handle.net/10803/38437.
Pełny tekst źródłaCalle, Juan Carlos. "Indoor propagation simulation software". Thesis, Monterey, Calif. : Springfield, Va. : Naval Postgraduate School ; Available from National Technical Information Service, 2000. http://handle.dtic.mil/100.2/ADA383980.
Pełny tekst źródłaThesis advisors, Lebaric, Jovan ; Adler, Richard. "September 2000." Includes bibliographical references (p. 45-46). Also available online.
Saeed, Muhammad Azam. "Pulverised biomass flame propagation". Thesis, University of Leeds, 2016. http://etheses.whiterose.ac.uk/15264/.
Pełny tekst źródłaMichaud, Denis 1970. "Neutrino propagation through matter". Thesis, McGill University, 1994. http://digitool.Library.McGill.CA:80/R/?func=dbin-jump-full&object_id=55513.
Pełny tekst źródłaRobinson, Anthony John. "Dynamic error propagation networks". Thesis, University of Cambridge, 1989. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.303145.
Pełny tekst źródłaDorbec, Paul. "Jeux, graphes et propagation". Habilitation à diriger des recherches, Université Sciences et Technologies - Bordeaux I, 2013. http://tel.archives-ouvertes.fr/tel-00975898.
Pełny tekst źródłaSoliman, Ehab Mohammed. "Delay hierarchy propagation model". Thesis, University of Plymouth, 2005. http://hdl.handle.net/10026.1/2334.
Pełny tekst źródłaBixler, Reid Morris. "Sparse Matrix Belief Propagation". Thesis, Virginia Tech, 2018. http://hdl.handle.net/10919/83228.
Pełny tekst źródłaMaster of Science
Berglund, Alexander, Fredrik Herbai i Jonas Wedén. "Sound Propagation Through Walls". Thesis, Uppsala universitet, Avdelningen för beräkningsvetenskap, 2021. http://urn.kb.se/resolve?urn=urn:nbn:se:uu:diva-444632.
Pełny tekst źródłaLe, Guilcher Arnaud. "Méthodes de propagation d'interfaces". Thesis, Paris Est, 2014. http://www.theses.fr/2014PEST1030/document.
Pełny tekst źródłaThis work is about the resolution of problems associated with the motion of interfaces. In each part of this thesis, the goal is to determine the motion of interfaces by the use of approached models consisting of equations or systems of equation on fields. The problems we get are parabolic equations and hyperbolic systems. In the first part (Chapter 2), we study a simplified model for the propagation of a shock wave in compressible fluid dynamics. This model can be written as a hyperbolic system, and we construct an algorithm to solve it numerically by a Fast-Marching like method. We also conduct a theoretical study of this system to determine reference solutions and test the algorithm. In the second part (Chapters 3 to 5), the approached models yield parabolic equations, and our goal is to show the existence of permanent regime solutions for these equations. Chapter 3 and 4 are dedicated to the study of a generic one-dimensional equation modelling reaction-diffusion phenomena. In Chapter 3, we show the existence of plane-like solutions for a general reaction term, and in Chapter 4 we use this result to show the existence of pulsating travelling waves in the specific case of a bistable nonlinearity. In Chapter 5, we study a phase-field model approaching a model for the dynamics of dislocations in a crystal, in a domain corresponding to a Frank-Read source
Ridgway, Douglas Thacher. "Fluctuation-controlled front propagation /". Diss., Connect to a 24 p. preview or request complete full text in PDF format. Access restricted to UC IP addresses, 1997. http://wwwlib.umi.com/cr/ucsd/fullcit?p9820864.
Pełny tekst źródłaSavage, Brian Kirk Gurnis Michael. "Regional seismic wavefield propagation /". Diss., Pasadena, Calif. : California Institute of Technology, 2004. http://resolver.caltech.edu/CaltechETD:etd-05262004-100247.
Pełny tekst źródłaPrice, M. A. "Sound propagation in woodland". Thesis, Open University, 1986. http://oro.open.ac.uk/56924/.
Pełny tekst źródłaBecker, Saskia. "The Propagation-Separation Approach". Doctoral thesis, Humboldt-Universität zu Berlin, Mathematisch-Naturwissenschaftliche Fakultät II, 2014. http://dx.doi.org/10.18452/16960.
Pełny tekst źródłaIn statistics, nonparametric estimation is often based on local parametric modeling. For pointwise estimation of the target function, the parametric neighborhoods can be described by weights that depend on design points or on observations. As it turned out, the comparison of noisy observations at single points suffers from a lack of robustness. The Propagation-Separation Approach by Polzehl and Spokoiny [2006] overcomes this problem by using a multiscale approach with iteratively updated weights. The method has been successfully applied to a large variety of statistical problems. Here, we present a theoretical study and numerical results, which provide a better understanding of this versatile procedure. For this purpose, we introduce and analyse a novel strategy for the choice of the crucial parameter of the algorithm, namely the adaptation bandwidth. In particular, we study its variability with respect to the unknown target function. This justifies a choice independent of the data at hand. For piecewise constant and piecewise bounded functions, this choice enables theoretical proofs of the main heuristic properties of the algorithm. Additionally, we consider the case of a misspecified model. Here, we introduce a specific step function, and we establish a pointwise error bound between this function and the corresponding estimates of the Propagation-Separation Approach. Finally, we develop a method for the denoising of diffusion-weighted magnetic resonance data, which is based on the Propagation-Separation Approach. Our new procedure, called (ms)POAS, relies on a specific description of the data, which enables simultaneous smoothing in the measured positions and with respect to the directions of the applied diffusion-weighting magnetic field gradients. We define and justify two distance functions on the combined measurement space, where we follow a differential geometric approach. We demonstrate the capability of (ms)POAS on simulated and experimental data.
Schiavazzi, Daniele. "Redundant Multiresolution Uncertainty Propagation". Doctoral thesis, Università degli studi di Padova, 2013. http://hdl.handle.net/11577/3422585.
Pełny tekst źródłaMetodi non intrusivi basati sull’espansione della risposta di un dato sistema nello spazio dei parametri (Chaos expansion methods) consentono di risolvere equazioni differenziali stocastiche con un numero di soluzioni deterministiche minori rispetto ad approcci tradizionali alla Monte Carlo con campionamento classico o stratificato. In tale ambito gli sforzi di ricerca odierni sono volti allo sviluppo di metodologie atte alla riduzione del costo computazionale in problemi caratterizzati da alta dimensionalitá (numero significativo di variabili aleatorie in input) ed al trattamento di problemi con risposta discontinua nello spazio dei parametri. La ricerca condotta si é concentrata sull’utilizzo di recenti tecniche di Compressive Sampling per la minimizzazione del numero di soluzioni deterministiche necessarie alla ricostruzione di risposte dotate di sparsitá secondo un pre-definito dizionario di basi. Inoltre, tecniche di approssimazione multi-risoluzione sono state estese a metodologie non intrusive di propagazione dell’incertezza. Infine, tecniche di Importance Sampling sono state utilizzate per determinare in modo adattativo l’ubicazione di nuovi samples al fine di cogliere le scale maggiormente importanti nelle risposte approssimate. Le metodologie approfondite ed implementate nell’ambito della ricerca svolta sono state applicate ad un insieme di funzioni analitiche, sistemi descritti da equazioni differenziali stocastiche, sistemi dinamici con risposte caratterizzate da elevati gradienti o discontinuitá, problemi ingegneristici con particolare riferimento all’ottimizzazione robusta della performance aerodinamica di profili per pale eoliche e sistemi passivi di smorzamento delle vibrazioni operanti sotto incertezza. Vengono inoltre presentate metodologie atte a ripristinare doti di conservazione di massa in flussi numerici e sperimentali.
Leissing, Thomas. "Nonlinear acoustic wave propagation in complex media : application to propagation over urban environments". Phd thesis, Université Paris-Est, 2009. http://tel.archives-ouvertes.fr/tel-00584398.
Pełny tekst źródłaMahmood, Attiya. "Impact of Antenna Mutual Coupling, Propagation, and Nonreciprocity on Propagation-Based Key Establishment". BYU ScholarsArchive, 2018. https://scholarsarchive.byu.edu/etd/6831.
Pełny tekst źródłaLeissing, Thomas. "Propagation d'ondes non linéaires en milieu complexe - Application à la propagation en environnement urbain". Phd thesis, Université Paris-Est, 2009. http://tel.archives-ouvertes.fr/tel-00455590.
Pełny tekst źródłaDessalermos, Spyridon. "Undersea acoustic propagation channel estimation". Thesis, Monterey, Calif. : Springfield, Va. : Naval Postgraduate School ; Available from National Technical Information Service, 2005. http://library.nps.navy.mil/uhtbin/hyperion/05Jun%5FDessalermos.pdf.
Pełny tekst źródłaThesis Advisor(s): Joseph Rice, Roberto Cristi. Includes bibliographical references (p. 117-119). Also available online.
Zahn, Ralph. "Prion propagation and molecular chaperones". Zürich : Institut für Molekularbiologie und Biophysik, Eidgenössische Technische Hochschule Zürich, 2002. http://e-collection.ethbib.ethz.ch/show?type=habil&nr=4.
Pełny tekst źródłaSander, Tavallaey Shiva. "Wave propagation in sandwich structure". Doctoral thesis, KTH, Vehicle Engineering, 2001. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-3088.
Pełny tekst źródłaLagerkvist, Mikael Zayenz. "Techniques for Efficient Constraint Propagation". Licentiate thesis, KTH, Electronic, Computer and Software Systems, ECS, 2008. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-9511.
Pełny tekst źródłaThis thesis explores three new techniques for increasing the efficiency of constraint propagation: support for incremental propagation, improved representation of constraints, and abstractions to simplify propagation. Support for incremental propagation is added to a propagator centered propagation system by adding a new intermediate layer of abstraction, advisors, that capture the essential aspects of a variable centered system. Advisors are used to give propagators a detailed view of the dynamic changes between propagator runs. Advisors enable the implementation of optimal algorithms for important constraints such as extensional constraints and Boolean linear in-equations, which is not possible in a propagator centered system lacking advisors. Using Multivalued Decision Diagrams (MDD) as the representation for extensional constraints is shown to be useful for several reasons. Classical operations on MDDs can be used to optimize the representation, and thus speeding up the propagation. In particular, the reduction operation is stronger than the use of DFA minimization for the regular constraint. The use of MDDs is contrasted and compared to a recent proposal where tables are compressed. Abstractions for constraint programs try to capture small and essential features of a model. These features may be much cheaper to propagate than the unabstracted program. The potential for abstraction is explored using several examples. These three techniques work on different levels. Support for incremental propagation is essential for the efficient implementation of some constraints, so that the algorithms have the right complexity. On a higher level, the question of representation looks at what a propagator should use for propagation. Finally, the question of abstraction can potentially look at several propagators, to find cases where abstractions might be fruitful. An essential feature of this thesis is a novel model for general placement constraints that uses regular expressions. The model is very versatile and can be used for several different kinds of placement problems. The model applied to the classic pentominoes puzzle will be used through-out the thesis as an example and for experiments.
Den här avhandlingen utforskar tre nya tekniker för att öka effektiviteten av villkorspropagering: stöd för inkrementell propagering, val av representation för villkor, samt abstraktion för att förenkla propagering. Ett propageringssystem organiserat efter propagerare utökas med stöd för inkrementell propagering genom att lägga till ett nytt abstraktionslager: rådgivare. Detta lager fångar de essentiella aspekterna hos system organiserade efter variabler. Rådgivare används för att ge propagerare detaljerad information om de dynamiska ändringarna i variabler mellan körningar av propageraren. Utökningen innebär att det går att implementera optimala algoritmer för vissa viktiga villkor såsom tabellvillkor och Boolska linjära olikheter, något som inte är möjligt i ett rent propagator-organiserat system. Användandet av så kallade Multivalued Decision Diagram (MDD) som representation för tabellvillkor visas vara användbart i flera avseenden. Klassiska MDD-operationer kan användas för att optimera representationen, vilket leder till snabbare propagering. Specifikt så är reduktionsoperationen kraftfullare än användandet av DFA-minimering för reguljära villkor. MDD-representationen jämförs också med ett nyligen framlagt förslag för komprimerade tabeller. Abstraktioner för villkorsprogram försöker fånga små men viktiga egenskaper i modeller. Sådana egenskaper kan vara mycket enklare att propagera än den konkreta modellen. Potentialen för abstraktioner undersöks för några exempel. Dessa tre tekniker fungerar på olika nivåer. Stöd för inkrementell propagering är nödvändigt för att kunna implementera vissa villkor effektivt med rätt komplexitet. Valet av representation för villkor är på en högre nivå, då det gäller att se vilka algoritmer som skall användas för ett villkor. Slutligen så måste flera villkor i en modell studeras för att finna rätt typ av abstraktioner. Ett utmärkande drag för den här avhandlingen är en ny modell för generella placeringsvillkor som använder reguljära uttryck. Modellen är mångsidig och kan användas för flera olika typer av placeringsproblem. Modellen specialiserad för pentominopussel används genomgående som exempel för experiment.
Coordinating Constraint Propagation
Uddholm, Per. "Numerical Simulation of Flame Propagation". Thesis, Uppsala University, Department of Information Technology, 2008. http://urn.kb.se/resolve?urn=urn:nbn:se:uu:diva-98325.
Pełny tekst źródłaThe effects of the temperature and length, of the preheat zone, on the deflagration to detonation transition are investigated through numerical simulation. The Navier-Stokes equations, with a reaction term, are solved in one dimension. The time integration is a one-dimensional adaptation of an existing two-dimensional finite volume method code. An iterative scheme, based on an overlap integral, is developed for the determination of the deflagration to detonation transition. The code is tested in a number of cases, where the analytical solution (to the Euler equations) is known. The location of the deflagration to detonation transition is displayed graphically through the preheat zone temperature as a function of the fuel mixture temperature, for fixed exhaust gas temperature and with the preheat zone length as a parameter. The evolution of the deflagration to detonation transition is investigated for an initial state well within the regime where the deflagration to detonation transition occurs. Graphs displaying the temporal evolution of pressure, temperature, reaction rate, and fuel mass fraction are presented. Finally, a method for estimating the flame velocity during the deflagration and detonation phases, as well as the flame acceleration during the intermediate phase, is developed.
Karis, Klas, Deborah Merzan i Jacob Wärnhjelm. "Electron Propagation in Periodic Potentials". Thesis, KTH, Teoretisk fysik, 2011. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-103467.
Pełny tekst źródłaFeng, Jiling. "Wave propagation in flexible tubes". Thesis, Brunel University, 2008. http://bura.brunel.ac.uk/handle/2438/5367.
Pełny tekst źródłaYamout, Fadi. "Relevance Feedback Using Weight Propagation". Thesis, University of Sunderland, 2008. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.485442.
Pełny tekst źródłaWilson, Simon Trevor. "Applications of cyclic belief propagation". Thesis, University of Cambridge, 2000. https://www.repository.cam.ac.uk/handle/1810/251732.
Pełny tekst źródłaQu, Yong. "Breeding and propagation of Meconopsis". Thesis, University of British Columbia, 1985. http://hdl.handle.net/2429/24899.
Pełny tekst źródłaLand and Food Systems, Faculty of
Graduate
Lu, Chun. "The error propagation in robots". Thesis, University of Ottawa (Canada), 1990. http://hdl.handle.net/10393/5871.
Pełny tekst źródłaBourbon, Claire. "Propagation de la 2-birationalité". Thesis, Bordeaux 1, 2011. http://www.theses.fr/2011BOR14279/document.
Pełny tekst źródłaThis thesis deals with the propagation of 2-birationality for 2-extensions of numbers fields. More precisely, le t K be a 2-rational totally real number field, L a CM quadratic extension of K, and let K be a totally real 2-extension of K. Under which conditions can one read the 2-birationaltiy of the compositum L = LK from L ? This work is divided into three parts : we first study the absolute quadratic case, then the relatively quadratic case, then finally the general case. The thesis’s main result solves the whole problem. We also illustrate the result with various numeric examples, obtained with PARI and a focus at the end on 2-birational extensions’ towers
Sander, Tavallaey Shiva. "Wave propagation in sandwich structures /". Stockholm, 2001. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-3088.
Pełny tekst źródłaMandehgar, Mahboubeh. "THz propagation in the Atmosphere". Thesis, Linnéuniversitetet, Institutionen för fysik och elektroteknik (IFE), 2013. http://urn.kb.se/resolve?urn=urn:nbn:se:lnu:diva-25561.
Pełny tekst źródłaMeurer, Thomas. "Wave propagation in hysteretic media". Thesis, Georgia Institute of Technology, 2000. http://hdl.handle.net/1853/19090.
Pełny tekst źródłaKamalarasa, Sanmugarasa. "Buckle propagation in submarine pipelines". Thesis, University of Cambridge, 1987. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.328779.
Pełny tekst źródłaJoia, Ivo Alexander. "Electromagnetic propagation through controlled turbulence". Thesis, University of Cambridge, 1993. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.319988.
Pełny tekst źródłaHodgkins, Andrew D. "Crack propagation in nuclear graphite". Thesis, University of Manchester, 2006. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.488486.
Pełny tekst źródłaMcBurnie, Sarah E. "Sound propagation through bubbly liquids". Thesis, University of Oxford, 2010. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.531980.
Pełny tekst źródłaMcKelvie, Marion Lindsay. "Ultrasonic propagation in cancellous bone". Thesis, University of Hull, 1988. http://hydra.hull.ac.uk/resources/hull:8397.
Pełny tekst źródłaMcBride, Hugh Joseph. "Wave propagation in elastic solids". Thesis, Monterey, California. Naval Postgraduate School, 1992. http://hdl.handle.net/10945/24107.
Pełny tekst źródłaZhao, Xin. "Wave Propagation under Ice Covers". Thesis, Clarkson University, 2015. http://pqdtopen.proquest.com/#viewpdf?dispub=3667183.
Pełny tekst źródłaThe operational ocean wave model needs a sea ice component to simulate the global ocean waves. Current ocean wave models treat ice covered regions crudely. The purpose of this thesis is to provide a unified continuum model for the wave ice interaction. Sea ice is constantly subject to environmental forcing. As a result, its physical appearance and mechanical properties vary dynamically. There are three existing classic wave ice interaction models: viscous layer, mass loading, and thin elastic plate models. Viscous layer models may be used to simulate grease ice, mass loading model is probably suitable for pancake ice, and thin elastic plate model may be used to describe a continuous ice sheet floating in water. This situation means that for different kind of sea ice we need different wave ice interaction models. Recently, a proposed viscoelastic wave ice interaction model synthesized the three classic models into one model. Under suitable limiting conditions this model converges to the three previous models. Based on this new development, the present study expands the viscoelastic model for wave propagation through two connected ice covered ocean regions. By doing so, the complete theoretical framework for evaluating wave propagation through various ice covers may be implemented in the operational ocean wave models. In this thesis, we introduce a three-layer viscoelastic model to include the eddy viscosity in turbulent boundary layer under the ice cover into previous viscoelastic model and the methods to calculate wave reflection and transmission. We also use recent results of a laboratory study to determine the viscoelstic model parameters with an inverse method. The thesis concludes with a numerical procedure for implementing the viscoelastic dispersion relation into the ocean wave model and some ideas of model parameterization.
Ambrizzi, Tercio. "Rossby wave propagation and teleconnections". Thesis, University of Reading, 1993. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.335893.
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