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Amenoagbadji, Pierre. "Wave propagation in quasi-periodic media". Electronic Thesis or Diss., Institut polytechnique de Paris, 2023. http://www.theses.fr/2023IPPAE020.
Pełny tekst źródłaThe goal of this thesis is to develop efficient numerical methods for the solution of the time-harmonic wave equation in quasiperiodic media, in the spirit of methods previously developed for periodic media. The goal is to use as in quasiperiodic homogenization the idea that an elliptic PDE with quasiperiodic coefficients can be interpreted as the cut of a higher-dimensional PDE which is elliptically degenerate, but with periodic coefficients. The periodicity property allows to use adapted tools, but the non-elliptic aspect makes the mathematical and numerical analysis of the PDE delicate. One application concerns transmission problems between periodic half-spaces (typically photonic crystals) when (1) the interface does not cut the periodic half-spaces in a direction of periodicity, or (2) when the periodic media have noncommensurate periods along the interface
Chalmers, Luke. "Locally resonant periodic acoustic media". Thesis, Loughborough University, 2010. https://dspace.lboro.ac.uk/2134/7120.
Pełny tekst źródłaNassar, Hussein. "Elastodynamic homogenization of periodic media". Thesis, Paris Est, 2015. http://www.theses.fr/2015PESC1151/document.
Pełny tekst źródłaThe recent issue of metamaterials design has renewed the interest in homogenization theories under dynamic loadings. In particular, the elastodynamic homogenization theory initiated by J.R. Willis has gained special attention while studying elastic cloaking. The present thesis reformulates Willis theory for periodic media, investigates its outcome and assesses its physical suitability in the sense of a few suggested ``homogenizability conditions''. Based on the results of this first part, approximate asymptotic expansions of Willis theory are explored in connection with strain-gradient media. A necessary convergence condition then shows that all optical dispersion branches are lost when long-wavelength low-frequency Taylor asymptotic expansions are carried out. Finally, a new homogenization theory is proposed to generalize Willis theory and improve it at finite frequencies in such a way that selected optical branches, formerly lost, are recovered. It is also proven that the outcome of the new theory is an effective homogeneous generalized continuum satisfying a generalized elastodynamic version of Hill-Mandel lemma
Powell, Sean K. "A quantitative study of diffusion in quasi-periodic fibre networks and complex porous media". Thesis, Queensland University of Technology, 2016. https://eprints.qut.edu.au/92506/12/92506%28thesis%29.pdf.
Pełny tekst źródłaNixon, Grant Ian. "Entropic trapping and polymer dynamics in static, quasi-periodic arrays of obstacles in two dimensional media". Thesis, University of Ottawa (Canada), 2003. http://hdl.handle.net/10393/26307.
Pełny tekst źródłaVanel, Alice. "Asymptotic analysis of discrete and continuous periodic media". Thesis, Imperial College London, 2018. http://hdl.handle.net/10044/1/64911.
Pełny tekst źródłaPathak, Mihir Gaurang. "Periodic flow physics in porous media of regenerative cryocoolers". Diss., Georgia Institute of Technology, 2013. http://hdl.handle.net/1853/49056.
Pełny tekst źródłaNitsche, Ludwig C. (Ludwig Carlos). "Multiphase flow through spatially periodic models of porous media". Thesis, Massachusetts Institute of Technology, 1989. http://hdl.handle.net/1721.1/111043.
Pełny tekst źródłaMantel, Rolf-Martin. "Periodic forcing and symmetry breaking of waves in excitable media". Thesis, University of Warwick, 1997. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.263610.
Pełny tekst źródłaMehrem, Issa Mohamed Mehrem Ahmed. "Nonlinear acoustics in periodic media: from fundamental effects to applications". Doctoral thesis, Universitat Politècnica de València, 2017. http://hdl.handle.net/10251/80289.
Pełny tekst źródłaLa dinámica natural no es ideal ni lineal. Para entender su comportamiento complejo, necesitamos estudiar la dinámica no lineal en modelos más simples. Esta tesis consta de dos configuraciones principales. Ambas configuraciones son modelos simplificados de el comportamiento que se produce en los sistemas complejos. Estudiamos en ambos sistemas la misma dinámica no lineal como son la generación de armónicos superiores, los sub-armónicos, las ondas solitarias, etc. En elCapítulo (2), se estudia, tanto teórica comoexperimentalmente, la propagación de ondas no lineales en sistemas periodicos de partículas acopladas mediante fuerzas repulsivas. Se propone una configuración experimental simple, que consiste en una matriz de dipolos magnéticos acoplados. Inyectando armónicamente la señal en un extremo, excitamos ondas de propagación y demostramos diferentes regímenes de conversión de modos en armónicos, fuertemente influenciados por la dispersión. También se predice y se discute el fenómeno de dilatación acústica de la cadena. Los resultados se comparan con las predicciones teóricas de la ecuación FPU, describiendo una cadena de masas conectadas por muelles cuadráticos no lineales. Los resultados pueden ser extrapolados a otros sistemas descritos por esta ecuación. Estudiamos también teórica y experimentalmente la generación y propagación de kinks. Excitamos pulsos en la frontera del sistema y demostramos la existencia de kinks cuyas propiedades están en muy buen acuerdo con las predicciones teóricas, es decir, con la ecuación que aproxima bajo las condiciones de nuestros experimentos la correspondiente al modelo completo que describe un cadena de masas conectadas por fuerzas magnéticas. Los resultados pueden ser extrapolados a otros sistemas descritos por esta ecuación. Además, en el caso de una red finita, donde se forman ondas estacionarias, describimos la observación de subarmónicos del armónico principal. En el capítulo (3), estudiamos la propagación de ondas acústicas intensas en un cristal multicapa. El medio consiste en un fluido estructurado, formado por un conjunto periódico de capas fluidas con propiedades acústicas lineales alternas y coeficiente de no linealidad cuadrática. Presentamos los resultados de diferentes modelos matemáticos (ecuación de ondas no lineal, ecuación de Westervelt y ecuaciones constitutivas). Mostramos que la interacción entre la fuerte dispersión y la no linealidad conduce a nuevos escenarios de propagaciónde ondas. El proceso de distorsión de la onda clásica, típico de las ondas acústicas intensas en medios homogéneos, puede ser alterado de forma importante cuando los armónicos generados no linealmente se encuentran dentro o cerca del gap. Esto permite la posibilidad de diseñar un medio con el fin de obtener una forma de onda en particular. Ejemplos de esto incluyen el diseño demedios con no linealidad efectiva (por ejemplo, cúbica) o medios extremadamente lineales. En el capítulo (4), el comportamiento oscilatorio de una microburbuja se investiga a través de una analogía acusto-mecánica basada en una cadena en forma de anillo de péndulos acoplados. Se estudian los modos de vibración paramétrica del anillo pendular excitado a frecuencias entre 1 y 5 Hz. Se han llevado a cabo simulaciones que muestran la presencia de modos espaciales, mixtos y fenómenos de localización. Se discute la relevancia de la analogía entre una microburbuja y la configuración macroscópica acústico-mecánica y se sugiere como una vía alternativa para investigar la complejidad de la dinàmica de microburbujas.
La dinàmica natural no és ideal ni tampoc lineal. Per entendre el seu comportament complex, es necessita estudiar la dinàmica no lineal dels models més simples. Aquesta tesi consisteix en l'estudi de dues configuracions principals, que són models simplificats del comportament que es produeix en els sistemes complexos. Estudiem en ambdós sistemes la mateixa dinàmica no lineal, com és la generació d'harmònics superiors, sub-harmònics, ones solitàries, etc. En el capítol (2), estudiem, tant teòrica com experimentalment, la propagació de les ones no lineals en sistemes periòdics de partícules acoblades mitjançant forces repulsives. Es proposa una configuració experimental simple, que consisteixen en una matriu de dipols magnètics acoblats. En conduint harmònicament la xarxa en un límit, excitemla propagació de les ones i demostrem diferents règims de conversió de modes en harmònics més alts, força influenciada per la dispersió. El fenomen de la dilatació acústica de la cadena també es prediu i es discuteix. Els resultats es comparen amb les prediccions teòriques que descriu una cadena de masses conectades per molls quadràtics no lineals. Els resultats es poden extrapolar a altres sistemes descrits per aquesta equació. Hem estudiat teòrica i experimentalment la generació i propagació de Kinks. Excitem polsos a la frontera del sistema i demostrem l'existència d'Kinks, les propietats desl quals estan en molt bon acord amb les prediccions teòriques, és a dir, de l'equació que aproxima sota les condicions dels nostres experiments la corresponent al model complet que descriu un cadena demasses connectades per forcesmagnètiques. Els resultats es poden extrapolar a altres sistemes descrits per aquesta equació. A més, en el cas d'una xarxa finita, on es formen ones estacionàries, descrivim l'observació de subarmónicos de l'harmònic principal. En el capítol (3), s'estudia la propagació d'ones acústiques intenses en un medi multicapa. El medi consisteix en un fluid estructurat, format per una matriu periòdica de capes de fluid amb l'alternança de propietats acústiques lineals i coeficient de no linealitat de segon grau. Es presenten els resultats per a diferents models matemàtics no lineals (equació d'ones no lineal, equació de Westervelt i les equacions constitutives). Es demostra que la interacciò entre la forta dispersió i no linealitat condueix a nous escenaris de propagació de l'ona. El procés de distorsió en formad'ona clàssica, típica de les ones acústiques intenses en medis homogenis, es pot alterar de manera significativa quan els harmònics generats de forma no lineal es troben dins o a prop del gap. Això obri la possibilitat de dissenyar unmedi per tal d'obtenir una forma d'ona particular. Exemples d'això inclouen el disseny delsmedis amb una no linealitat efectiva (per exemple cúbica), o medis extremadament lineals. En el capítol (4), el comportament oscilatori d'una micro-bombolla és investigat a través d' una analogia acústica-mecànica basada en una cadena en forma d'anell de pèndols acoblats. Es considera l'observació dels modes de vibració paramètriques de l'anell pendular excitat amb freqüències entre 1 i 5 Hz. S'han dut a terme simulacions que mostren la presència de moes espacilas, mixtes i fenòmens de localització. Es discuteix la relevància de l'analogia entre les microbambolles i la configuració macroscòpica acústica-mecànica i es suggereix una formaalternativa per a investigar la complexitat de la dinàmica demicrobombolles.
Mehrem Issa Mohamed Mehrem, A. (2017). Nonlinear acoustics in periodic media: from fundamental effects to applications [Tesis doctoral no publicada]. Universitat Politècnica de València. https://doi.org/10.4995/Thesis/10251/80289
TESIS
Stompe, Janina Annuschka [Verfasser], i A. [Akademischer Betreuer] Kirsch. "Transmission Eigenvalues for Periodic Media / Janina Annuschka Stompe ; Betreuer: A. Kirsch". Karlsruhe : KIT-Bibliothek, 2017. http://d-nb.info/1147485070/34.
Pełny tekst źródłaMakwana, Mehul. "Theoretical extensions and applications of high frequency homogenisation to periodic media". Thesis, Imperial College London, 2015. http://hdl.handle.net/10044/1/28236.
Pełny tekst źródłaCherednichenko, Kirill. "Higher-order and non-local effects in homogenisation of periodic media". Thesis, University of Bath, 2001. https://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.392062.
Pełny tekst źródłaNarisetti, Raj K. "Wave propagation in nonlinear periodic structures". Diss., Georgia Institute of Technology, 2010. http://hdl.handle.net/1853/39643.
Pełny tekst źródłaGaillot, Davy Paul. "Optical Properties of Complex Periodic Media Structurally Modified by Atomic Layer Deposition". Diss., Georgia Institute of Technology, 2007. http://hdl.handle.net/1853/14635.
Pełny tekst źródłaSun, Ning 1963. "Studies of Particles and Wave Propagation in Periodic and Quasiperiodic Nonlinear Media". Thesis, University of North Texas, 1995. https://digital.library.unt.edu/ark:/67531/metadc278708/.
Pełny tekst źródłaChakraborty, Sankar. "Scalar, electromagnetic and elastic waves in periodic and certain broken-periodicity media /". free to MU campus, to others for purchase, 1997. http://wwwlib.umi.com/cr/mo/fullcit?p9842515.
Pełny tekst źródłaMEIRBEKOVA, BIBINUR. "WAVE PROPAGATION IN ELASTIC MEDIA WITH INTERNAL STRUCTURE. PERIODIC TRANSFORMATIONS AND CURVED BEAMS". Doctoral thesis, Università degli Studi di Cagliari, 2020. http://hdl.handle.net/11584/290548.
Pełny tekst źródłaThirunavukkarasu, Senganal. "Impedance Matching for Discrete, Periodic Media and Application to Two-Scale Wave Propagation Models". Thesis, North Carolina State University, 2015. http://pqdtopen.proquest.com/#viewpdf?dispub=3690210.
Pełny tekst źródłaVO, ANK KHOA. "Corrector homogenization estimates for PDE Systems with coupled fluxes posed in media with periodic microstructures". Doctoral thesis, Gran Sasso Science Institute, 2018. http://hdl.handle.net/20.500.12571/9693.
Pełny tekst źródłaKanschat-Krebs, Oliver [Verfasser], i Malte A. [Akademischer Betreuer] Peter. "On problems of periodic homogenisation of highly heterogeneous media / Oliver Kanschat-Krebs ; Betreuer: Malte A. Peter". Augsburg : Universität Augsburg, 2020. http://d-nb.info/1217194037/34.
Pełny tekst źródłaWells, Daniel Patrick. "Predicting the Longevity of DVDR Media by Periodic Analysis of Parity, Jitter, and ECC Performance Parameters". BYU ScholarsArchive, 2008. https://scholarsarchive.byu.edu/etd/1530.
Pełny tekst źródłaBarnwell, Ellis. "One and two-dimensional propagation of waves in periodic heterogeneous media : transient effects and band gap tuning". Thesis, University of Manchester, 2015. https://www.research.manchester.ac.uk/portal/en/theses/one-and-twodimensional-propagation-of-waves-in-periodic-heterogeneous-media-transient-effects-and-band-gap-tuning(9a5bd9d7-09da-46a8-ae57-b63d9d815f10).html.
Pełny tekst źródłaWells, Daniel Patrick. "Predicting the longevity of DVD-R media by periodic analysis of Parity, jitter, and ECC performance parameters /". Diss., CLICK HERE for online access, 2008. http://contentdm.lib.byu.edu/ETD/image/etd2526.pdf.
Pełny tekst źródłaCREVACORE, ELEONORA. "The role of recirculation zones on flow and transport phenomena in periodic porous media. A multi-scale study". Doctoral thesis, Politecnico di Torino, 2017. http://hdl.handle.net/11583/2676747.
Pełny tekst źródłaAlavi, Seyed Ehsan. "Homogénéisation de milieux architecturés périodiques et quasi-périodiques vers des milieux continus généralisés". Electronic Thesis or Diss., Université de Lorraine, 2021. http://www.theses.fr/2021LORR0305.
Pełny tekst źródłaThis thesis aims to revisit higher-order homogenization schemes towards higher-order or higher gradient continua, successively for periodic and quasi-periodic architected materials and composites, based on variational principles and an extension of Hill macrohomogeneity condition. Continuous homogenization methods are exposed in Part I for micropolar and micromorphic media, followed by an exposition of the alternative discrete homogenization method.We have extended these theoretical developments to the situation of quasi-periodic materials, which still have a regular microstructure. The common idea to the proposed periodic homogenization methods of continuous or discrete nature is to split the microscopic displacement into a homogeneous part representative of the kinematics of the adopted effective continuum and a fluctuation evaluated from a variational principle. In substance, the theoretical developments allow the elaboration of enriched continua (generalized continua) of micromorphic type and all sub continua obtained using suitable degeneration conditions. Numerical applications have been made for architected materials and inclusion-based composites prone to higher-order effects due to their inner architecture. On the theoretical framework, the performed developments remedy many existing limitations of existing higher-order homogenization schemes.In Part II, repetitive lattice materials' effective classical and higher-order mechanical properties have been evaluated based on discrete homogenization schemes. Following the idea of a phenomenological approach, consistent couple stress models of repetitive beam lattices have been elaborated. Enriched Cosserat media have been derived in the spirit of micromechanics, adopting Timoshenko beam models at a microlevel, and applying a continualization method towards a Cosserat effective substitution medium. The proposed continualization method proves to be accurate and computationally efficient compared to continuous homogenization schemes and fully resolved finite element simulations. One key outcome of the performed analyses is the quantification of edge effects in the response of lattice structures, relying on the surface formulation of the extended Hill macrohomogeneity condition.The theoretical background underlying quasi-periodic asymptotic homogenization in the framework of linearized anisotropic elasticity deserves the development of Part III. Different methodologies for evaluating the effective quasi-periodic properties have been elaborated, leading to the emergence of strain gradient effective media. Conformal transformations define a specific class of geometrical mappings, allowing for designing compatible architected materials with inner porosity gradient, making them suitable bone biomechanics candidates
Seetharaman, Sathya Sai. "Electromagnetic interactions in one-dimensional metamaterials". Thesis, University of Exeter, 2018. http://hdl.handle.net/10871/33746.
Pełny tekst źródłaMahachoklertwattana, Pongsak. "A fast full-wave solver for the analysis of large planar finite periodic antenna arrays in grounded multilayered media". Columbus, Ohio : Ohio State University, 2007. http://rave.ohiolink.edu/etdc/view?acc%5Fnum=osu1187152961.
Pełny tekst źródłaUrban, Maik [Verfasser], Ben [Akademischer Betreuer] Schweizer i Dhia Anne-Sophie [Gutachter] Bonnet-Ben. "On time-harmonic Maxwell’s equations in periodic media / Maik Urban ; Gutachter: Anne-Sophie Bonnet-Ben Dhia ; Betreuer: Ben Schweizer". Dortmund : Universitätsbibliothek Dortmund, 2019. http://d-nb.info/1214441483/34.
Pełny tekst źródłaWang, Ping. "Social game retrieval from unstructured videos". Diss., Georgia Institute of Technology, 2010. http://hdl.handle.net/1853/34673.
Pełny tekst źródłaJap, Lilian. "Mapping detected periodic dance movements to control tempo in the music playback of Electronic Dance Music". Thesis, KTH, Skolan för elektroteknik och datavetenskap (EECS), 2019. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-251668.
Pełny tekst źródłaAtt engagera sig i ett musikset av ens favoritartist eller DJ leder ofta till resultatet av en kraftfull och euforisk känsloupplevelse, en känsla delvis framkallat av att man dansar i takt med musiken. I ett försök att simulera en liknande dansupplevelse undersöker denna användarstudie när en användare dansar i rytm till musik och dessutom är i kontroll av tempot genom de skapade dansrörelserna. En proof-of-concept prototyp konstruerades och testades i en första studie, följt av en huvudstudie där prototypen hade modifierats och 12 deltagare deltog. Ett frågeformulär gavs med olika frågor som skulle bedömas via en Likert-skala, med avseende på deras subjektiva erfarenhet. Öppna frågor ingick också för att samla deras egna åsikter. Från resultaten kunde ett ökat engagemang och en förhöjd njutning av musiken identifieras när man kunde manipulera tempot.
Frank, Florian Verfasser], i Peter [Akademischer Betreuer] [Knabner. "Numerical Studies of Models for Electrokinetic Flow and Charged Solute Transport in Periodic Porous Media / Florian Frank. Gutachter: Peter Knabner". Erlangen : Friedrich-Alexander-Universität Erlangen-Nürnberg (FAU), 2013. http://d-nb.info/1054331324/34.
Pełny tekst źródłaVoisey, Ruth. "Multiple wave scattering by quasiperiodic structures". Thesis, University of Manchester, 2014. https://www.research.manchester.ac.uk/portal/en/theses/multiple-wave-scattering-by-quasiperiodic-structures(1c366ad1-443a-4667-9d03-db77487ab1d1).html.
Pełny tekst źródłaDANESI, VERONICA. "PERIODIC AND QUASI-PERIODIC ORBITS IN NEARLY INTEGRABLE HAMILTONIAN SYSTEMS". Doctoral thesis, Università degli Studi di Milano, 2021. http://hdl.handle.net/2434/814594.
Pełny tekst źródłaKaplan, Ali Emre. "Study of Periodic and Quasi-Periodic Structures in Silicon-on-Insulator". Master's thesis, Alma Mater Studiorum - Università di Bologna, 2016. http://amslaurea.unibo.it/11038/.
Pełny tekst źródłaKhayamian, Chiara. "Periodic and Quasi-Periodic Solutions of some Non-Linear Hamiltonian PDE's". Thesis, Avignon, 2017. http://www.theses.fr/2017AVIG0418/document.
Pełny tekst źródłaThe aim of this thesis is the research of periodic and quasi-periodic solutions for some non-linear hamiltonian PDEs
Inglis, Andrew R. "Quasi-periodic pulsations in solar flares". Thesis, University of Warwick, 2009. http://wrap.warwick.ac.uk/2762/.
Pełny tekst źródłaRussell, Brandon C. "HOMOGENIZATION IN PERFORATED DOMAINS AND WITH SOFT INCLUSIONS". UKnowledge, 2018. https://uknowledge.uky.edu/math_etds/55.
Pełny tekst źródłaBjerklöv, Kristian. "Dynamical Properties of Quasi-periodic Schrödinger Equations". Doctoral thesis, KTH, Matematik, 2003. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-3606.
Pełny tekst źródłaBaudart, Guillaume. "A synchronous approach to quasi-periodic systems". Thesis, Paris Sciences et Lettres (ComUE), 2017. http://www.theses.fr/2017PSLEE007/document.
Pełny tekst źródłaIn this thesis we study embedded controllers implemented as sets of unsynchronized periodic processes. Each process activates quasi-periodically, that is, periodically with bounded jitter, and communicates with bounded transmission delays. Such reactive systems,termed 'quasi-periodic', exist as soon as two periodic processes areconnected together. In the distributed systems literature they arealso known as synchronous real-time models. We focus on techniquesfor the design and analysis of such systems without imposing a globa lclock synchronization. Synchronous languages were introduced as domain specific languages for the design of reactive systems. They offer an ideal framework to program, analyze, and verify quasi-periodic systems. Based on a synchronous approach, this thesis makes contributions to the treatment of quasi-periodic systems along three themes: verification,implementation, and simulation.Verification: The 'quasi-synchronous abstraction' is a discrete abstraction proposed by Paul Caspi for model checking safety properties of quasi-periodic systems. We show that this abstractionis not sound in general and give necessary and sufficient conditionson both the static communication graph of the application and the real-time characteristics of the architecture to recover soundness. We then generalize these results to multirate systems.Implementation: 'Loosely time-triggered architectures' are protocols designed to ensure the correct execution of an application running on a quasi-periodic system. We propose a unified framework that encompasses both the application and the protocol controllers. This framework allows us to simplify existing protocols, propose optimized versions, and give new correctness proofs. We instantiate our framework with a protocol based on clock synchronization to compare the performance of the two approaches.Simulation: Quasi-periodic systems are but one example of timed systems involving real-time characteristics and tolerances. For such nondeterministic models, we propose a 'symbolic simulation' scheme inspired by model checking techniques for timed automata. We show how to compile a model mixing nondeterministic continuous-time and discrete-time dynamics into a discrete program manipulating sets of possible values. Each trace of the resulting program captures a set of possible executions of the source program
Anderson, Mark Carter Caughey Thomas Kirk. "A study of the periodic and quasi-periodic solutions of the discrete duffing equation /". Diss., Pasadena, Calif. : California Institute of Technology, 1986. http://resolver.caltech.edu/CaltechETD:etd-03252008-105035.
Pełny tekst źródłaAdanir, Suleyman. "Efficient Computation Of The Green'". Master's thesis, METU, 2011. http://etd.lib.metu.edu.tr/upload/12612968/index.pdf.
Pełny tekst źródłas function in layered media which is expressed as an infinite series in terms of the spectral domain Green&rsquo
s function. The slow converging nature of this series make these kinds of analysis computationally expensive. Although some papers have proposed methods to accelerate the computation of these series successfully for a single frequency point, it is still very computation intensive to obtain the frequency response of the structure over a band of frequencies. In this thesis, Discrete Complex Image Method (DCIM) is utilized for the efficient computation of the periodic Green&rsquo
s function. First, the spectral domain Green&rsquo
s function in layered media is approximated by complex exponentials through the use of DCIM. During the application of the DCIM, three-level approximation scheme is employed to improve accuracy. Then, Ewald&rsquo
s transformation is applied to accelerate the computation of the infinite series involved in the periodic Green&rsquo
s functions. The accuracy and the efficiency of the method is demonstrated through numerical examples.
Khajavizadeh, Lida. "Growth and structural characterization of ScN/CrN periodic and quasi-periodic superlattices for thermoelectric application". Thesis, Linköpings universitet, Institutionen för fysik, kemi och biologi, 2014. http://urn.kb.se/resolve?urn=urn:nbn:se:liu:diva-106657.
Pełny tekst źródłaBricault, Charlie. "Diminution des vibrations et du bruit rayonné d'une paroi par contrôle distribué". Thesis, Le Mans, 2017. http://www.theses.fr/2017LEMA1009/document.
Pełny tekst źródłaMaking the structure lighter is an important economic stake in the field of industrial activities such as automotive, aeronautic or naval, which gradually integrate composite materials in the manufacturing of structures. This reduction of the mass goes along with a stiffening of the matter implying acoustics and vibrations issues. Several methods exist to reduce vibrations or acoustic radiations of structures, but these methods increase the mass. In order to answer the problematic, we propose to change the dynamic behavior of structures with a periodic lattice of piezoelectric patches shunted with an electrical circuit whose the impedance can be controlled. Therefore, the control of the coupled behavior of the piezoelectric patches allows the control of vibrational wave's diffusion inside the structure and so to treat the structure-borne vibrations and airborne acoustics emission. The shunt method chosen is negative capacitance shunt which allows to modify the rigidity of a structure. This semi-passive method has several advantages: the implementation is simple, it is possible to integrate the patches directly inside the wall, it consumes a low amonte of electrical energy and its implementation is inexpensive
Ha, Minh Thien. "Modelling of stochastic and quasi-periodic texture images /". [S.l.] : [s.n.], 1989. http://library.epfl.ch/theses/?nr=804.
Pełny tekst źródłaPugh, Chloe E. "Quasi-periodic pulsations in solar and stellar flares". Thesis, University of Warwick, 2018. http://wrap.warwick.ac.uk/109151/.
Pełny tekst źródłaTrujillo, Amezquita Frank. "Exotic and tame behaviour in quasi-periodic dynamics". Thesis, Université de Paris (2019-....), 2020. http://www.theses.fr/2020UNIP7042.
Pełny tekst źródłaIn this work we study conditions for the existence of quasi-periodic phenomena and the implications of their presence in several dynamical systems. Our main focus will be Hamiltonian dynamics where we provide criteria for the persistence of quasi-periodic motions associated to invariant resonant tori (Chapter 2), explore to what extent the existence of quasi-periodic motions characterize the system (Chapter 3) and give examples of unstable elliptic equilibria with two degrees of freedom (Chapter 4). For critical circle homeomorphisms (Chapter 5) we establish a relation between the Hausdorff dimension of their invariant measures and their rotation number. In the last part of this thesis (Chapter 6) we prove, by means of localized periodic approximations, the existence of mixing zero entropy smooth transformations on T3 whose product with themselves is loosely Bernoulli
Cha, Jeesung Jeff. "Hydrodynamic Parameters of Micro Porous Media for Steady and Oscillatory Flow: Application to Cryocooler Regenerators". Diss., Available online, Georgia Institute of Technology, 2007, 2007. http://etd.gatech.edu/theses/available/etd-07092007-194225/.
Pełny tekst źródłaJeremy P. Harvey, Committee Member ; Carl S. Kirkconnell, Committee Member ; Kurt D. Pennell, Committee Member ; S. Mostafa Ghiaasiaan, Committee Chair ; Prateen V. Desai, Committee Member ; Sheldon M. Jeter, Committee Member.
Ren, Kai. "Physics-Based Near-Field Microwave Imaging Algorithms for Dense Layered Media". The Ohio State University, 2017. http://rave.ohiolink.edu/etdc/view?acc_num=osu1511273574098455.
Pełny tekst źródłaHöpker, Martin Verfasser], Michael [Akademischer Betreuer] [Böhm, Alfred [Gutachter] Schmidt i Ralph E. [Gutachter] Showalter. "Extension Operators for Sobolev Spaces on Periodic Domains, Their Applications, and Homogenization of a Phase Field Model for Phase Transitions in Porous Media / Martin Höpker. Betreuer: Michael Böhm. Gutachter: Alfred Schmidt ; Ralph E. Showalter". Bremen : Staats- und Universitätsbibliothek Bremen, 2016. http://d-nb.info/1111020914/34.
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