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Dissertations / Theses on the topic 'Theory of oscillatory waves'

Author: Grafiati

Published: 4 June 2021

Last updated: 15 February 2022

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1

Swan, Christopher. "The higher order dynamics of progressive waves." Thesis, University of Cambridge, 1987. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.328829.

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2

Forster, Graham Keith. "Instability and wave-growth within some oscillatory fluid flows." Thesis, University of St Andrews, 1996. http://hdl.handle.net/10023/14087.

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Oscillatory fluid flows arise naturally in many systems. Whether or not these systems are stable is an important question and external periodic forcing of the flow may result in rich and complicated behaviours. Here three distinct oscillatory fluid flows are examined in detail, with the stability of each being established using a range of analytical and computational methods. The first system comprises standing surface capillary-gravity waves in second-harmonic resonance subject to Faraday excitation. Using the perturbation technique of multiple scales, the amplitude equations for the system a

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3

Weicker, Lionel. "Slow-fast oscillations of delayed feedback systems: theory and experiment." Doctoral thesis, Universite Libre de Bruxelles, 2014. http://hdl.handle.net/2013/ULB-DIPOT:oai:dipot.ulb.ac.be:2013/209242.

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Dans ce travail, nous étudions deux types de problèmes à retard. Le premier traite des oscillateurs optoélectroniques (OOEs). Un OOE est un système bouclé permettant de délivrer une onde électromagnétique radio-fréquence de grande pureté spectrale et de faible bruit électronique. Le second problème traite du couplage retardé de neurones. Une nouvelle forme de synchronisation est observée où un régime oscillant est une alternative à un état stationnaire stable. Ces deux problèmes présentent des oscillations de type slow-fast. Une grande partie de ma thèse est dévouée à l’analyse de ces régimes.

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4

Tığrak, Ulaş Esra Pashaev Oktay. "Damping Oscillatory Models In General Theory of Relativity/." [s.l.]: [s.n.], 2007. http://library.iyte.edu.tr/tezler/master/matematik/T000667.pdf.

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5

Haaf, Hermann. "Existence of periodic travelling waves to reaction-diffusion equations with excitable-oscillatory kinetics." Thesis, University of Warwick, 1993. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.387347.

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6

Eckermann, Stephen D. "Atmospheric gravity waves : obsevations and theory /." Title page, table of contents and abstract only, 1990. http://web4.library.adelaide.edu.au/theses/09PH/09phe1862.pdf.

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Thesis (Ph. D.)--University of Adelaide, Dept. of Physics and Mathematical Physics, 1990.<br>Copies of author's previously published articles inserted. Includes bibliographical references (leaves 261-288).

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7

Feldmann, John. "Novel itinerant transverse spin waves." Thesis, Boston College, 2009. http://hdl.handle.net/2345/994.

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Thesis advisor: Kevin S. Bedell<br>In 1956, Lev Davidovich Landau put forth his theory on systems of interacting fermions, or fermi liquids. A year later, Viktor Pavlovich Silin described spin waves that such a system of fermions would support. The treatment of the contribution of the molecular field to the spin wave dispersion was a novel aspect of these spin waves. Silin predicted that there would exist a hierarchy of spin waves in a fermi liquid, one for each component of the spherical harmonic expansion of the fermi surface. In 1968, Anthony J. Leggett and Michael J. Rice derived from ferm

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8

Varholm, Kristoffer. "Water waves with compactly supported vorticity : A functional-analytic approach to bifurcation theory and the mathematical theory of traveling water waves." Thesis, Norges teknisk-naturvitenskapelige universitet, Institutt for fysikk, 2014. http://urn.kb.se/resolve?urn=urn:nbn:no:ntnu:diva-25748.

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We study the mathematical theory of water waves. Local bifurcation theory is also discussed, including the Crandall-Rabinowitz theorem; an abstract theorem used to establish the presence of bifurcation points in the zero set of maps on Banach spaces. A functional-analytic approach is used to prove the existence of a family of localized traveling waves with one or more point vortices, by bifurcating from a trivial solution. This is done in the setting of the incompressible Euler equations with gravity and surface tension, on finite depth. Our result is an extension of a recent result by Shatah,

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9

Bradley, Brian Kevin. "Characterizing the relative velocity of seagrass blades under oscillatory flow conditions and the implications for wave attenuation." [Pensacola, Fla.] : University of West Florida, 2007. http://purl.fcla.edu/fcla/etd/WFE0000081.

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10

Foulkes, Andrew J. "Drift and meander of spiral waves." Thesis, University of Liverpool, 2009. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.507172.

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11

Leonard, S. R. "The propagation of nonlinear waves in a bubbly liquid." Thesis, University of Leeds, 1988. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.235334.

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12

Chen, Jerry Min. "Subharmonic resonance of nonlinear cross-waves: Theory and experiments." Diss., The University of Arizona, 1988. http://hdl.handle.net/10150/184350.

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The generation and evolution of cross-waves in a channel are investigated analytically, numerically and experimentally. The derivation of the modulation equation governing the inviscid cross-wave amplitude yields the nonlinear Schrodinger equation with a homogeneous Robin boundary condition at the wavemaker. Either of two uniformly valid scalings--cross-wave amplitude of the same order as or much larger than the wavemaker amplitude--may be used in the derivations. The differences between the two scalings are discussed. The inviscid modulation equation is augmented by a linear damping term, the

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13

Aasen, Ailo. "A Study of Rotational Water Waves using Bifurcation Theory." Thesis, Norges teknisk-naturvitenskapelige universitet, Institutt for fysikk, 2014. http://urn.kb.se/resolve?urn=urn:nbn:no:ntnu:diva-27092.

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This thesis is concerned with the water wave problem. Using local bifurcation we establish small-amplitude steady and periodic solutions of the Euler equations with vorticity. Our approach is based on that of Ehrnström, Escher and Wahlén \cite{EEW11}, the main difference being that we use new bifurcation parameters. The bifurcation is done both from a one-dimensional and a two-dimensional kernel, the latter bifurcation giving rise to waves having more than one crest in each minimal period. We also give a novel and rudimentary proof of a key lemma establishing the Fredholm property o

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14

Cohen, Jennifer Esther. "Theory of turbulent wind over fast and slow waves." Thesis, University of Cambridge, 1997. https://www.repository.cam.ac.uk/handle/1810/283717.

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15

Pichler-Tennenberg, Alex K. "On an equation related to Stokes waves." Thesis, University of Bath, 2002. https://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.251121.

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16

Kwok, Loong-Piu. "Viscous cross-waves: Stability and bifurcation." Diss., The University of Arizona, 1988. http://hdl.handle.net/10150/184441.

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In the first part of this thesis, the nonlinear Schrodinger equation for inviscid cross-waves near onset is found to be modified by viscous linear damping and detuning. The accompanying boundary condition at the wavemaker is also modified by damping from the wavemaker meniscus. The relative contributions of the free-surface, sidewalls, bottom, and wavemaker viscous boundary layers are computed. It is shown that viscous dissipation due to the wavemaker meniscus breaks the symmetry of the neutral curve. In the second part, existence and stability of steady solutions to the nonlinear Schrodinger

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17

Nicolaou, D. "Internal waves around a moving body." Thesis, University of Manchester, 1987. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.383254.

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18

Misra, Shubhra K. "The turbulent dynamics of quasi-steady spilling breakers theory and experiments /." Access to citation, abstract and download form provided by ProQuest Information and Learning Company; downloadable PDF file Size3.11, 280 p, 2005. http://wwwlib.umi.com/dissertations/fullcit?3181879.

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19

Edwin, Patricia Mary. "Magnetohydrodynamic waves in structured atmospheres." Thesis, University of St Andrews, 1985. http://hdl.handle.net/10023/2701.

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The effect of structuring, in the form of magnetic or density inhomogeneities, on the magnetohydrodynamic (mhd) waves of an infinite plasma is investigated. The appropriate dispersion formulae, in both Cartesian and cylindrical polar coordinate geometries, are derived. The main properties of the allowable modes in structured plasmas are described, particularly those featuring in a slender inhomogeneity. The inclusion of non-adiabatic effects is examined, specifically for a thermally dissipative, unstratified, finite structure and for a slender inhomogeneity in a stratified medium. The dissipat

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20

Aldridge, John Nigel. "A continuum mixture theory approach to sediment transport with application to turbulent oscillatory boundary layers." Thesis, University of Plymouth, 1990. http://hdl.handle.net/10026.1/1897.

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Two aspects of the modelling of suspended sediment transport are investigated. One is the development of a theoretical base for sediment transport models starting from the continuum theory of immiscible mixtures (also know as two-phase flow theories). The other is a comparison with experimental data of numerical predictions from a number of turbulence models for oscillatory, turbulent boundary layer flow containing suspended sediment. A review is given of previous work that has applied continuum mixture theories to the field of sediment transport. Turbulent averaged forms of the mixture equati

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21

Wu, Yongshu. "Hydroelastic analyses of non-beamlike ships in waves." Thesis, Brunel University, 1990. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.253493.

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22

Lalancette, Marc. "Gravitational waves from a string cusp in Einstein-aether theory." Thesis, University of British Columbia, 2008. http://hdl.handle.net/2429/643.

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The motivation of this thesis is to look for a signature of Lorentz violation, hopefully observable, in the gravitational waves emitted by cosmic strings. Aspects of cosmic strings are reviewed, in particular how focused bursts of gravitational radiation are emitted when a cusp forms on the string. The same phenomenon is then studied in an effective field theory with Lorentz violation called Einstein-aether theory. This is a simple theory with a dynamic preferred frame, but it retains rotational and diffeomorphism invariance. The linearized version of the theory produces five wave modes. We st

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23

Ni, Daiheng. "Extension and generalization of Newell's simplified theory of kinematic waves." Diss., Available online, Georgia Institute of Technology, 2004:, 2004. http://etd.gatech.edu/theses/available/etd-11112004-112805/unrestricted/ni%5Fdaiheng%5F200412%5Fphd.pdf.

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Thesis (Ph. D.)--Civil and Environmental Engineering, Georgia Institute of Technology, 2005.<br>Leonard, John D., Committee Chair ; Goldsman, Dave, Committee Member ; Amekudzi, Adjo, Committee Member ; Hunter, Michael, Committee Member ; Dixon, Karen, Committee Member. Vita. Includes bibliographical references.

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24

Yang, Jianke. "Some nonlinear equations arising in the theory of water waves." Thesis, Massachusetts Institute of Technology, 1994. http://hdl.handle.net/1721.1/12051.

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25

Al-Naseri, Haidar. "Quantum kinetic relativistic theory of linearized waves in magnetized plasmas." Thesis, Umeå universitet, Institutionen för fysik, 2018. http://urn.kb.se/resolve?urn=urn:nbn:se:umu:diva-150292.

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In this work we have studied linear wave propagation in magnetized plasmas using a fully relativistic kinetic equation of spin-1/2 particles in the long scale approximation. The linearized kinetic equation is very long and complicated, hence we worked with restricted geometries in order to simplify the calculations. The dispersion relation of the relativistic model was calculated and compared with a dispersion relation from a previous work at the semi-relativistic limit. Moreover, a new mode was discovered that survives in the zero temperature limit. The origin of the mode in the kinetic equat

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26

Buckner, A. J. F. "The theory of electron heating in collisonless plasma shock waves." Thesis, University of St Andrews, 1993. http://hdl.handle.net/10023/13973.

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Equations are derived to describe the evolution of an electron distribution function under the action of electromagnetic instabilities in a non-uniform plasma using an extension of the quasilinear theory of Kennel and Engelmann. Variations in both the electron density and temperature and the background magnetic field are taken into account. These equations are simplified in the limit of small electron beta so that an electrostatic approximation is justified. Methods are then presented which allow the solution of these equations (or, in principle, the more complex electromagnetic equations). In

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27

Ratan, Naren. "Complex phase space representation of plasma waves : theory and applications." Thesis, University of Oxford, 2017. https://ora.ox.ac.uk/objects/uuid:af5654e3-3137-4d9a-b41d-574cd72103b2.

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This thesis presents results on the description of plasma waves in terms of wavepackets. The wave field is decomposed into a distribution of wavepackets in a space of position, wavevector, time, and frequency. A complex structure joining each pair of Fourier conjugate variables into a single complex coordinate allows the efficient derivation of equations of motion for the phase space distribution by exploiting its analytic properties. The Wick symbol calculus, a mathematical tool generalizing many convenient properties of the Fourier transform to a local setting, is used to derive new exact ph

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28

Malladi, Vijaya Venkata Narasimha Sriram. "Continual Traveling waves in Finite Structures: Theory, Simulations, and Experiments." Diss., Virginia Tech, 2016. http://hdl.handle.net/10919/81451.

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A mechanical wave is generated as a result of an external force interacting with the well-defined medium and it propagates through that medium transferring energy from one location to another. The ability to generate and control the motion of the mechanical waves through the finite medium opens up the opportunities for creating novel actuation mechanisms not possible before. However, any impedance to the path of these waves, especially in the form of finite boundaries, disperses this energy in the form of reflections. Therefore, it is impractical to achieve steady state traveling waves in fini

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29

Hayward, Sean A. "The collision of plane waves in general relativity." Thesis, University of Southampton, 1990. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.293211.

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30

Fuscaldo, Walter. "Advanced radiating systems based on leaky waves and nondiffracting waves." Thesis, Rennes 1, 2017. http://www.theses.fr/2017REN1S015/document.

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La focalisation du champ électromagnétique dans les zones de champ proche et lointain est un sujet de forte actualité pour l'imagerie médicale et la radiométrie des microondes jusqu'aux ondes millimétriques. Dans ce cadre, la théorie des ondes de fuite est un formalisme élégant qui permet de décrire d'une même façon les problèmes radiatifs en champ proche et en champ lointain des microondes aux fréquences optiques. Dans cette thèse, on utilise la polyvalence de la théorie des ondes de fuite pour développer des systèmes rayonnants complexes afin de contrôler les caractéristiques radiatives en c

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31

Decent, Stephen Paul. "Hysteresis and mode competition in Faraday waves." Thesis, University of St Andrews, 1996. http://hdl.handle.net/10023/14054.

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Faraday waves arise on the surface of a liquid in a container that is undergoing vertical periodic oscillations. We investigate two-dimensional Faraday waves in a long rectangular container, both theoretically and experimentally. Hysteresis occurs when both finite amplitude solutions and the flat surface solution are available. We derive a nonlinear model of a standing wave, extending the Lagrangian method of Miles (1976). The model is used to investigate hysteresis. It is found necessary to retain cubic damping, cubic forcing and the fifth-order conservative term in order to achieve agreement

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32

El, Allaoui Nazha. "Modified hydrodynamics in fragmented canopies exposed to oscillatory flows." Doctoral thesis, Universitat de Girona, 2016. http://hdl.handle.net/10803/403066.

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The general objective of this doctoral thesis has been to contribute to understand the modification of hydrodynamics in fragmented canopies. The effect of different parameters such as the canopy density, the plant height and flexibility and the architecture of the gap has been studied. Ecological implications of the results have been discussed. Results point that the fluxes of biological particles, nutrients and sediments in fragmented canopies are modified compared with those for non-fragmented canopies, impacting on their ecological function. Therefore, canopies may optimize their structural

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33

Gou, Jia. "Oscillatory dynamics for PDE models coupling bulk diffusion and dynamically active compartments : theory, numerics and applications." Thesis, University of British Columbia, 2016. http://hdl.handle.net/2429/57603.

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We formulate and investigate a relatively new modeling paradigm by which spatially segregated dynamically active units communicate with each other through a signaling molecule that diffuses in the bulk medium between active units. The modeling studies start with a simplified setting in a one-dimensional space, where two dynamically active compartments are located at boundaries of the domain and coupled through the feedback term to the local dynamics together with flux boundary conditions at the two ends. For the symmetric steady state solution, in-phase and anti-phase synchronizations are foun

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34

Xiao, Jingni. "Theoretical advances on scattering theory, fractional operators and their inverse problems." HKBU Institutional Repository, 2018. https://repository.hkbu.edu.hk/etd_oa/513.

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Inverse problems arise in numerous fields of science and engineering where one tries to find out the desired information of an unknown object or the cause of an observed effect. They are of fundamental importance in many areas including radar and sonar applications, nondestructive testing, image processing, medical imaging, remote sensing, geophysics and astronomy among others. This study is concerned with three issues in scattering theory, fractional operators, as well as some of their inverse problems. The first topic is scattering problems for electromagnetic waves governed by Maxwell equat

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35

Rogoff, Zigmund M. "Diffraction of acoustic waves at fluid-solid boundaries." Thesis, University of Nottingham, 1996. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.319952.

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36

Basu, Sukalpa. "Phase Transitions and Spin Waves in Cerium." Diss., Temple University Libraries, 2010. http://cdm16002.contentdm.oclc.org/cdm/ref/collection/p245801coll10/id/76660.

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Physics<br>Ph.D.<br>In the Gamma-Alpha phase transition in Cerium, the magnetic properties change from a temperature-dependent Curie-Weiss susceptibility in the high temperature gamma phase to a temperature-independent paramagnetic susceptibility in the low temperature alpha phase. Taking into account the crystal-field split Hamiltonian, the energy eigenvalues and eigenfunctions are calculated for the doublet and the quartet ground states which are then used to determine the Kondo temperature for different crystal field splittings. The susceptibility and B-T phase diagrams are obtained for bot

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37

Zacchia, Paolo B. "Evolutionary macroeconomics : Schumpeterian long waves and shorter-term dynamics." Thesis, University of Cambridge, 1994. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.336506.

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38

Marini, Andrea. "Theory of nonlinear and amplified surface plasmon polaritons." Thesis, University of Bath, 2011. https://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.547873.

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This thesis presents a study of Surface Plasmon Polaritons (SPPs) in hybrid metal-dielectric waveguides. The embedding of metal in nanostructured photonic components allows for manipulating and guiding light at the subwavelength scale. Such an extreme confinement enhances the nonlinear response of the dielectric medium, which is important for applications in optical processing of information, but is paid in terms of considerable ohmic loss in the metal. It is, however, possible to embed externally pumped active inclusions in the dielectric in order to compensate for the metal loss. A novel per

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39

Henkel, Carsten. "Coherence theory of atomic de Broglie waves and electromagnetic near fields." Thesis, [S.l. : s.n.], 2004. http://pub.ub.uni-potsdam.de/2004/0027/henkel.pdf.

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40

Marchand, Tanguy. "Studying gravitational waves of compact binary systems using post-Newtonian theory." Thesis, Sorbonne université, 2018. http://www.theses.fr/2018SORUS121/document.

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La détection ainsi que l’analyse des ondes gravitationnelles émises par les systèmes binaires d’objets compacts reposent sur notre capacité à faire des prédictions précises au sein de la théorie de la relativité générale. Dans cette thèse, nous utilisons la théorie post-newtonienne (PN), et en particulier le formalisme connu sous le nom de Blanchet-Damour-Iyer, aﬁn d’étudier de tels systèmes. La ﬁnalité des diﬀérents calculs réalisés au sein de cette thèse est d’obtenir la phase du signal gravitationnel à l’ordre 4,5PN, et les résultats que nous présentons nous rapprochent fortement de cet obj

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41

Yokoyama, Naoto. "Statistics of Gravity Waves The Weak Turbulence Theory and Its Breakdown." 京都大学 (Kyoto University), 2004. http://hdl.handle.net/2433/147799.

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42

Roberts, D. L. "Statistical properties of waves diffracted by a random phase screen." Thesis, University of Cambridge, 1985. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.372906.

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43

Korobkov, Pavel. "General relativistic theory of light propagation in the field of gravitational multipoles." Diss., Columbia, Mo. : University of Missouri-Columbia, 2007. http://hdl.handle.net/10355/4883.

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Thesis (Ph. D.)--University of Missouri-Columbia, 2007.<br>The entire dissertation/thesis text is included in the research.pdf file; the official abstract appears in the short.pdf file (which also appears in the research.pdf); a non-technical general description, or public abstract, appears in the public.pdf file. Title from title screen of research.pdf file (viewed Nov. 27, 2007). Vita. Includes bibliographical references.

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44

An, Sunghyuck. "Theory of multiwave mixing in two- and three-level media." Diss., The University of Arizona, 1988. http://hdl.handle.net/10150/184560.

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This dissertation presents theories of multiwave mixing in two- and three-level media. The first part of the dissertation treats the semiclassical theories in two-level media. Chapter 2 gives the simple semiclassical theory of four-wave mixing when the two pump frequences differ by more than the reciprocal of the population-difference lifetime. This difference washes out the pump spatial holes as well as one of the two reflection gratings. We compare the results to the degenerate treatment of Abrams and Lind and find significant differences in the reflection coefficient spectra. Chapter 3 pres

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45

Fozard, John Andrew. "Diffraction and scattering of high frequency waves." Thesis, University of Oxford, 2005. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.433239.

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This thesis examines certain aspects of diffraction and scattering of high frequency waves, utilising and extending upon the Geometrical Theory of Diffraction (GTD). The first problem considered is that of scattering of electromagnetic plane waves by a perfectly conducting thin body, of aspect ratio O(k^1/2), where k is the dimensionless wavenumber. The edges of such a body have a radius of curvature which is comparable to the wavelength of the incident field, which lies inbetween the sharp and blunt cases traditionally treated by the GTD. The local problem of scattering by such an edge is tha

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46

Kardell, Marcus. "Total positivity and oscillatory kernels : An overview, and applications to the spectral theory of the cubic string." Thesis, Linköpings universitet, Tillämpad matematik, 2010. http://urn.kb.se/resolve?urn=urn:nbn:se:liu:diva-58005.

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In the study of the Degasperis-Procesi dierential equation, an eigenvalue problem called the cubic string occurs. This is a third order generalization of the second order problem describing the eigenmodes of a vibrating string. In this thesis we study the eigenfunctions of the cubic string for discrete and continuous mass distributions, using the theory of total positivity, via a combinatorial approach with planar networks.

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47

Skrynnikov, Yuri 1959. "Nonlinear coupled waves in stratified flows." Monash University, School of Mathematical Sciences, 2002. http://arrow.monash.edu.au/hdl/1959.1/7779.

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48

Donnelly, Cara. "Shearing waves and the MRI dynamo in stratified accretion discs." Thesis, University of Cambridge, 2014. https://www.repository.cam.ac.uk/handle/1810/246452.

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Accretion discs efficiently transport angular momentum by a wide variety of as yet imperfectly understood mechanisms, with profound implications for the disc lifetime and planet formation. We discuss two different methods of angular momentum transport: first, generation of acoustic waves by mixing of inertial waves, and second, the generation of a self-sustaining magnetic field via the magnetorotational instability (MRI) which would be a source of dissipative turbulence. Previous local simulations of the MRI have shown that the dynamo changes character on addition of vertical stratification. W

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49

Wolfson, Michael Aaron. "Kinetic theory of waves in random media and amelioration of classical chaos." Diss., The University of Arizona, 1994. http://hdl.handle.net/10150/186895.

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The approach to the classical limit of wave mechanics is investigated where, in the classical limit, the dynamical system is nonintegrable and the motion in phase space is chaotic. The problem is cast in the setting of wave propagation in random media, and the fundamental starting point is an idealized stochastic parabolic wave equation (SPE) in two space dimensions with plane wave initial data. The potential is taken to have mean zero, strength ε ≪ 1 fluctuations which are homogeneous, isotropic, and have a single scale. The formal classical limit of the SPE, the parabolic ray equations are i

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50

Doole, Stuart Harvey. "Steady gravity waves on flows with vorticity : bifurcation theory and variational principles." Thesis, University of Oxford, 1993. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.357537.

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