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Rozprawy doktorskie na temat „Periodic and quasi-Periodic media”

Autor: Grafiati

Data publikacji: 8 czerwca 2024

Data aktualizacji: 31 lipca 2025

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1

Amenoagbadji, Pierre. "Wave propagation in quasi-periodic media." Electronic Thesis or Diss., Institut polytechnique de Paris, 2023. http://www.theses.fr/2023IPPAE020.

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L'objectif de la thèse est de développer des méthodes numériques originales pour la résolution de l'équation des ondes en régime harmonique dans des milieux quasi-périodiques, dans l'esprit des méthodes développées précédemment pour des milieux périodiques. L'idée est d'utiliser comme dans des travaux d'homogénéisation quasi-périodique le fait que l'étude d'une EDP elliptique avec des coefficients quasi-périodiques se ramène à l'étude d'une EDP elliptiquement dégénérée en dimension supérieure, mais dont les coefficients sont périodiques. Le caractère périodique permet d'utiliser des outils ada

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2

Chalmers, Luke. "Locally resonant periodic acoustic media." Thesis, Loughborough University, 2010. https://dspace.lboro.ac.uk/2134/7120.

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Phononic crystals are composite media, with two different elastic materials modulated in a periodic fashion. The two-dimensional system under study is comprised of an array of cylindrical tubes arranged in a square Bravais lattice. The propagation of a time-harmonic acoustic Bloch waves is investigated experimentally and the findings compared with those obtained from the finite element method. The band structure, that is a well-known characteristic of Bloch wave dispersion, is also determined. This demonstrates the existence of band gaps of forbidden transmission at certain frequency ranges. T

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3

Nassar, Hussein. "Elastodynamic homogenization of periodic media." Thesis, Paris Est, 2015. http://www.theses.fr/2015PESC1151/document.

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La problématique récente de la conception de métamatériaux a renouvelé l'intérêt dans les théories de l'homogénéisation en régime dynamique. En particulier, la théorie de l'homogénéisation élastodynamique initiée par J.R. Willis a reçu une attention particulière suite à des travaux sur l'invisibilité élastique. La présente thèse reformule la théorie de Willis dans le cas des milieux périodiques, examine ses implications et évalue sa pertinence physique au sens de quelques ``conditions d'homogénéisabilité'' qui sont suggérées. En se basant sur les résultats de cette première partie, des dévelop

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4

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.

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Diffusion is the fundamental process behind many molecular phenomena such as the mixing of substances. Its physical basis is the random motion of particles in a fluid. In complex porous media, diffusion is restricted by interactions with internal structures. In this work, we present studies of restricted diffusion that aim to efficiently produce quantitative models for obtaining detailed information about the morphology of biological porous media from diffusion tensor imaging experiments. We achieved this by developing a Langevin dynamics algorithm to provide physically realistic modelling of

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5

Nixon, 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.

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Using the bond fluctuation algorithm of Carmesin and Kremer (Carmesin and Kremer 1988), we investigate the static and dynamic properties of self-avoiding linear polymers embedded in static, two-dimensional (d=2), quasi-periodic arrays of obstacles with entropic traps. The phenomenon of polymer collapse, the closely related enrichment and depletion of polymer configurations, the conformational relaxation, and the diffusive behaviour are all investigated within the framework of the lattice Monte Carlo method. Several distinct dynamical regimes are encountered: the (obstacle-free) Rouse-like regi

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6

Vanel, Alice. "Asymptotic analysis of discrete and continuous periodic media." Thesis, Imperial College London, 2018. http://hdl.handle.net/10044/1/64911.

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Mechanical mass-spring networks have long acted to motivate, and gain qualitative intuition, in solid-state physics, continuous media containing periodic arrays of inclu- sions such as phononic crystals, and more recently in metamaterials. While in some cases an exact or approximate analogy between the continuous model and its discrete representation can be systematically drawn, more often such analogies are introduced heuristically to aid interpretation with the lumped parameters estimated and accepted as qualitative. This thesis builds towards making the analogy exact; we first look at the d

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7

Pathak, Mihir Gaurang. "Periodic flow physics in porous media of regenerative cryocoolers." Diss., Georgia Institute of Technology, 2013. http://hdl.handle.net/1853/49056.

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Pulse tube cryocoolers (PTC) are a class of rugged and high-endurance refrigeration systems that operate without moving parts at their low temperature ends, and are capable of reaching temperatures down to and below 123 K. PTCs are particularly suitable for applications in space, guiding systems, cryosurgery, medicine preservation, superconducting electronics, magnetic resonance imaging, weather observation, and liquefaction of gases. Applications of these cryocoolers span across many industries including defense, aerospace, biomedical, energy, and high tech. Among the challenges facing the PT

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8

Nitsche, 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.

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9

Mantel, 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.

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10

Mehrem, 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.

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The natural dynamics are not ideal or linear. To understand their complex behavior, we needs to study the nonlinear dynamics in more simple models. This thesis is consist of two main setups. Both setups are simplified models for the behavior occurs in the complex systems. We studied in both systems the same nonlinear dynamics such as higher-harmonics, sub-harmonics, solitary waves,...etc. In Chapter (2), the propagation of nonlinear waves in a lattice of repelling particles is studied theoretically and experimentally. A simple experimental setup is proposed, consisting in an array of coupled m

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11

Stompe, Janina Annuschka [Verfasser], and 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.

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12

Makwana, Mehul. "Theoretical extensions and applications of high frequency homogenisation to periodic media." Thesis, Imperial College London, 2015. http://hdl.handle.net/10044/1/28236.

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An asymptotic scheme is generated that captures the motion of waves within discrete, semi-discrete and continuous periodic media by creating continuum homogenised equations. Conventional homogenisation theory is a well-known classical method valid when the wavelength of any disturbance is long relative to the microstructure. Unfortunately many of the features of interest in real applications involve wave oscillations that are of high frequency and that have wavelength of the same, or similar, order to the microstructure; this requires a new version of homogenisation theory: High frequency homo

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13

Cherednichenko, 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.

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14

Narisetti, Raj K. "Wave propagation in nonlinear periodic structures." Diss., Georgia Institute of Technology, 2010. http://hdl.handle.net/1853/39643.

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A periodic structure consists of spatially repeating unit cells. From man-made multi-span bridges to naturally occurring atomic lattices, periodic structures are ubiquitous. The periodicity can be exploited to generate frequency bands within which elastic wave propagation is impeded. A limitation to the linear periodic structure is that the filtering properties depend only on the structural design and periodicity which implies that the dispersion characteristics are fixed unless the overall structure or the periodicity is altered. The current research focuses on wave propagation in nonlinear

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15

Gaillot, 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.

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In the late eighties, a new class of materials, known as photonic crystals (PCs), emerged enabling the propagation and generation of light to be potentially manipulated with unprecedented control. PCs consist of a periodic modulation of dielectric constant in one, two, or three dimensions, which can result in the formation of directional or omni-directional photonic band gaps (PBGs), spectral regions where light propagation is forbidden, and more remarkably, novel dispersion characteristics. Since PC properties scale with the dimension of the wavelength of interest, significant technological c

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16

Sun, 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/.

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This thesis examines the properties of transmission and transport of light and charged particles in periodic or quasiperiodic systems of solid state and optics, especially the nonlinear and external field effects and the dynamic properties of these systems.

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17

Chakraborty, 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.

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18

MEIRBEKOVA, 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.

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In this thesis we will focus on the linear elastodynamic properties of complex materials. In Chapter 2, we review the linear theory of elasticity. This chapter provides a brief overview of the basic laws of elasticity theory for di_erent coordinate systems, that will facilitate the further development of our research. Dispersion properties of 2D periodic systems for di_erent lattices are reported in Chapter 3. The governing equations of out of plane wave and examples of coordinate transformations in Cartesian and cylindrical are considered in Chapter 4. Also the scattering problems by square

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19

Thirunavukkarasu, 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.

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20

VO, 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.

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The purpose of this thesis is the derivation of corrector estimates justifying the upscaling of systems of partial differential equations (PDEs) with coupled fluxes posed in media with microstructures (like porous media). Such models play an important role in the understanding of, for example, drug-delivery mechanisms, where the involved chemical species diffusing inside the domain are assumed to obey perhaps other transport mechanisms and certain non-dissipative nonlinear processes within the pore space and at the boundaries of the perforated media (e.g. interaction, chemical reaction, a

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21

Kanschat-Krebs, Oliver [Verfasser], and 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.

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22

Wells, 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.

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For the last ten years, DVD-R media have played an important role in the storage of large amounts of digital data throughout the world. During this time it was assumed that the DVD-R was as long-lasting and stable as its predecessor, the CD-R. Several reports have surfaced over the last few years questioning the DVD-R's ability to maintain many of its claims regarding archival quality life spans. These reports have shown a wide range of longevity between the different brands. While some DVD-Rs may last a while, others may result in an early and unexpected failure. Compounding this problem is t

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23

Barnwell, 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.

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In this thesis, the propagation of transient waves in heterogeneous media and the tuning of periodic elastic materials are studied. The behaviour of time harmonic waves in complex media is a well understood phenomenon. The primary aim of this text is to gain a deeper understanding into the propagation of transient waves in periodic media. The secondary aim is to explore the time harmonic behaviour of two dimensional pre-stressed elastic media and investigate the plausibility of band gap tuning. We begin this text by investigating the reflection of pulses from a semi-infinite set of point masse

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24

Wells, 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.

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25

CREVACORE, 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.

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In recent years, the injection of nanoscopic particles of zero-valent iron (nZVI) proved to be an effective intervention to remediate contaminated aquifer systems. Thus, the fate and transport of nZVI, as well as those of contaminants and harmful particles, needs to be completely characterised in order to design successful interventions. The theoretical framework in which this research field is enclosed is the study of flow and transport phenomena in porous media. Under laminar flow regime, computational fluid-dynamic (CFD) simulations of flow field and transport of both reacting and non-react

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26

Alavi, 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.

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Cette thèse vise à revisiter les schémas d'homogénéisation d'ordre supérieur vers des continuums d'ordre ou de gradient supérieurs, successivement pour les matériaux et composites architecturés périodiques et quasi-périodiques, en se basant sur des principes variationnels et une extension de la condition de macrohomogénéité de Hill. Les méthodes d'homogénéisation continue sont exposées dans la première partie pour les milieux micropolaires et micromorphes, suivies par une présentation de l’homogénéisation discrète, alternative de l’homogénéisation continue.Nous avons étendu ces développements

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27

Seetharaman, Sathya Sai. "Electromagnetic interactions in one-dimensional metamaterials." Thesis, University of Exeter, 2018. http://hdl.handle.net/10871/33746.

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Metamaterials offer the freedom to tune the rich electromagnetic coupling between the constituent meta-atoms to tailor their collective electromagnetic response. Therefore, a comprehensive understanding of the nature of electromagnetic interactions between meta-atoms is necessary for novel metamaterial design, which is provided in the first part of this thesis. The subsequent work in the thesis applies the understanding from the first part to design and demonstrate novel one-dimensional metamaterials that overcome the limitations of metamaterials proposed in literature or exhibit electromagnet

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28

Mahachoklertwattana, 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.

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29

Urban, Maik [Verfasser], Ben [Akademischer Betreuer] Schweizer, and 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.

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30

Wang, Ping. "Social game retrieval from unstructured videos." Diss., Georgia Institute of Technology, 2010. http://hdl.handle.net/1853/34673.

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Parent-child social games, such as peek-a-boo and patty-cake, are a key element of an infant's earliest social interactions. The analysis of children's behaviors in social games based on video recordings provides a means for psychologists to study their social and cognitive development. However, the current practice in the use of video for behavioral research is extremely labor-intensive, involving many hours spent extracting and coding relevant video clips from a large corpus. From the standpoint of computer vision, such real-world video collections pose significant challenges in the automati

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31

Jap, 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.

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Engaging in the music set of one’s favorite artist or DJ is oftentimes leading to the result of a powerful and euphoric felt experience, a sensation partly also induced from dancing in beat to the music. In an attempt to simulate a similar dance experience, a user-study was designed in order to investigate when a user is let to dance in rhythm to a music playback and in addition, in control of a music playback tempo through the induced dance movements. A proof-of-concept prototype was built and tested in an initial study, followed by a main study where the prototype had been modified and 12 pa

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32

Frank, Florian Verfasser], and 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.

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33

Voisey, 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.

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Understanding the phenomenon of wave scattering by random media is a ubiquitous problem that has instigated extensive research in the field. This thesis focuses on wave scattering by quasiperiodic media as an alternative approach to provide insight into the effects of structural aperiodicity on the propagation of the waves. Quasiperiodic structures are aperiodic yet ordered so have attributes that make them beneficial to explore. Quasiperiodic lattices are also used to model the atomic structures of quasicrystals; materials that have been found to have a multitude of applications due to their

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34

DANESI, 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.

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The study of periodic and quasi-periodic orbits in nearly integrable Hamiltonian systems is a long standing and challenging problem, that dates back to Poincaré. Quoting Poincaré, they represent "the only opening through which we can try to enter a place which, up to now, was deemed inaccessible". The aim of this thesis is to find effective and constructive algorithms for constructing both periodic and quasi-periodic solutions via a modification of the normal form methods related to Kolmogorov's theorem. The thesis is divided in two parts. The first part concerns the classical problem of th

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35

Kaplan, 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/.

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In this thesis, a numerical design approach has been proposed and developed based on the transmission matrix method in order to characterize periodic and quasi-periodic photonic structures in silicon-on-insulator. The approach and its performance have been extensively tested with specific structures in 2D and its validity has been verified in 3D.

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36

Khayamian, Chiara. "Periodic and Quasi-Periodic Solutions of some Non-Linear Hamiltonian PDE's." Thesis, Avignon, 2017. http://www.theses.fr/2017AVIG0418/document.

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Les équations aux dérivées partielles (EDP) permettent d’aborder d’un point de vue mathématique des phénomènes observés dans tous les domaines des sciences. Certaines EDP non-linéaires modélisent des problèmes de mécanique statistique, mécanique des fluides, théories de la gravitation ou des mathématiques financières.L’objectif de ce travail de thèse est l’étude de certains problèmes d’ EDP non-linéaires et hamiltoniennes et la recherche des leurs solutions périodiques et quasi-périodiques<br>The aim of this thesis is the research of periodic and quasi-periodic solutions for some non-linear ha

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37

Inglis, Andrew R. "Quasi-periodic pulsations in solar flares." Thesis, University of Warwick, 2009. http://wrap.warwick.ac.uk/2762/.

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For several decades, quasi-periodic pulsations (QPP) in flares have been a signature feature of solar dynamics. In the last fifteen years, the advent of new observational instruments has led to a much-improved scope for studying and understanding such phenomena. These events are particularly relevant to the field of coronal seismology, where impulsive events are used as diagnostic tools to estimate the physical parameters of the solar atmosphere remotely. In this thesis we investigate quasi-periodic pulsations in flares from both a numerical and observational perpective, mostly in terms of mag

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38

Russell, Brandon C. "HOMOGENIZATION IN PERFORATED DOMAINS AND WITH SOFT INCLUSIONS." UKnowledge, 2018. https://uknowledge.uky.edu/math_etds/55.

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In this dissertation, we first provide a short introduction to qualitative homogenization of elliptic equations and systems. We collect relevant and known results regarding elliptic equations and systems with rapidly oscillating, periodic coefficients, which is the classical setting in homogenization of elliptic equations and systems. We extend several classical results to the so called case of perforated domains and consider materials reinforced with soft inclusions. We establish quantitative H1-convergence rates in both settings, and as a result deduce large-scale Lipschitz estimates and Lio

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39

Bjerklöv, 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.

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40

Baudart, Guillaume. "A synchronous approach to quasi-periodic systems." Thesis, Paris Sciences et Lettres (ComUE), 2017. http://www.theses.fr/2017PSLEE007/document.

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Cette thèse traite de systèmes embarqués contrôlés par un ensemble de processus périodiques non synchronisés. Chaque processus est activé quasi-périodiquement, c'est-à-dire périodiquement avec une gigue bornée. Les délais de communication sont également bornés. De tels systèmes réactifs, appelés 'quasi-périodiques', apparaissent dès que l'on branche ensemble deux processus périodiques. Dans la littérature, ils sont parfois qualifiés de systèmes distribués temps-réels synchrones. Nous nous intéressons aux techniques de conception et d'analyse de ces systèmes qui n'imposent pas de synchronisatio

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41

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.

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42

Adanir, Suleyman. "Efficient Computation Of The Green&#039." Master's thesis, METU, 2011. http://etd.lib.metu.edu.tr/upload/12612968/index.pdf.

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Numerical analysis of periodic structures in layered media is usually accomplished by using Method of Moments which requires the formation of the impedance matrix of the structure. The construction of this impedance matrix requires the evaluation of the periodic Green&rsquo<br>s function in layered media which is expressed as an infinite series in terms of the spectral domain Green&rsquo<br>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 success

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43

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.

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The aim of this diploma work is the deposition and characterization of ScN/CrN superlattices with both periodic and quasi-periodic structures. ScN as semiconductor material with (2eV) band gap energy was selected due to its thermal and mechanical stability and its hardness. High resistivity against oxidation and high wear resistance were the reasons for choosing CrN as another candidate for the superlattices. The Rudin Shapiro structure was selected as quasi-periodic structure because of its more random structure. In this research both periodic and Rudin Shapiro as quasi-periodic structures ha

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Bricault, Charlie. "Diminution des vibrations et du bruit rayonné d'une paroi par contrôle distribué." Thesis, Le Mans, 2017. http://www.theses.fr/2017LEMA1009/document.

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L'allègement des structures est un enjeu économique important dans les domaines d'activités industrielles telles que l'automobile, l'aéronautique ou le naval, qui intègrent peu à peu les matériaux composites dans la fabrication des structures. Cet allègement s'accompagne d'un raidissement de la matière qui implique des problèmes de vibrations et d'isolation acoustique. Plusieurs méthodes de traitement existent pour diminuer les vibrations ou le bruit rayonné d'une paroi, mais ces méthodes ont l'inconvénient d'augmenter significativement la masse de la paroi. Afin de répondre à cette problémati

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Ha, Minh Thien. "Modelling of stochastic and quasi-periodic texture images /." [S.l.] : [s.n.], 1989. http://library.epfl.ch/theses/?nr=804.

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Pugh, Chloe E. "Quasi-periodic pulsations in solar and stellar flares." Thesis, University of Warwick, 2018. http://wrap.warwick.ac.uk/109151/.

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Quasi-periodic pulsations (QPPs) are a phenomenon commonly observed in solar flares, and are also occasionally observed in stellar flares. They are time variations in the intensity of the flare emission that repeat with approximately constant timescales, or timescales that increase or decrease monotonically in the special case of non-stationary QPPs. There are two main reasons for the interest in QPPs. First is the potential for the diagnosis of plasma parameters in the corona, such as the magnetic field strength and plasma density, which are otherwise difficult to observe directly. If the mec

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Trujillo, Amezquita Frank. "Exotic and tame behaviour in quasi-periodic dynamics." Thesis, Université de Paris (2019-....), 2020. http://www.theses.fr/2020UNIP7042.

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Dans ce travail, nous étudions les conditions d'existence de phénomènes quasi périodiques et les implications de leur présence dans plusieurs systèmes dynamiques. Nous nous concentrerons principalement sur la dynamique hamiltonienne où nous fournissons des critères pour la persistance des mouvements quasi-périodiques associés à des tores résonants invariants (chapitre 2), explorons dans quelle mesure l'existence de mouvements quasi-périodiques caractérise le système (chapitre 3) et donnons des exemples des points fixes elliptiques instables avec deux degrés de liberté (chapitre 4). Pour les ho

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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/.

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Thesis (Ph. D.)--Mechanical Engineering, Georgia Institute of Technology, 2008.<br>Jeremy 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.

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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.

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Höpker, Martin Verfasser], Michael [Akademischer Betreuer] [Böhm, Alfred [Gutachter] Schmidt, and 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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