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Дисертації з теми "Waves topology"

Автор: Grafiati

Опубліковано: 14 вересня 2024

Оновлено: 31 липня 2025

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1

Deymier, Pierre, and Keith Runge. "One-Dimensional Mass-Spring Chains Supporting Elastic Waves with Non-Conventional Topology." MDPI AG, 2016. http://hdl.handle.net/10150/615109.

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There are two classes of phononic structures that can support elastic waves with non-conventional topology, namely intrinsic and extrinsic systems. The non-conventional topology of elastic wave results from breaking time reversal symmetry (T-symmetry) of wave propagation. In extrinsic systems, energy is injected into the phononic structure to break T-symmetry. In intrinsic systems symmetry is broken through the medium microstructure that may lead to internal resonances. Mass-spring composite structures are introduced as metaphors for more complex phononic crystals with non-conventional topolog

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2

Tsoi, Man. "Persistence of planar spiral waves under domain truncation near the core." Columbus, Ohio : Ohio State University, 2006. http://rave.ohiolink.edu/etdc/view?acc%5Fnum=osu1148486634.

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3

Jezequel, Lucien. "Phase space approach to topological physics : Mode-shell correspondence and extentions to non-Hermitian and non-linear systems." Electronic Thesis or Diss., Lyon, École normale supérieure, 2024. http://www.theses.fr/2024ENSL0021.

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Depuis les années 80 et la découverte de l’effet Hall quantique, la topologie s’est avérée être un outil crucial pour analyser divers phénomènes ondulatoires. Parmi les concepts clés ayant émergés de ce domaine, la correspondance bord-volume se distingue. Elle établit un lien entre l'existence d'états de bords d'énergie nulle dans des matériaux isolants dans leur volume et des propriétés topologiques définies dans le-dit volume. Cependant, de nombreux autres phénomènes topologiques, tels que les isolants d'ordre supérieur ou les semi-métaux sont documentés dans la littérature, chacun avec sa p

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4

Wadbro, Eddie. "Topology Optimization for Wave Propagation Problems." Doctoral thesis, Uppsala universitet, Avdelningen för teknisk databehandling, 2009. http://urn.kb.se/resolve?urn=urn:nbn:se:uu:diva-98382.

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This thesis considers topology optimization methods for wave propagation problems. These methods make no a priori assumptions on topological properties such as the number of bodies involved in the design. The performed studies address problems from two different areas, acoustic wave propagation and microwave tomography. The final study discusses implementation aspects concerning the efficient solution of large scale material distribution problems. Acoustic horns may be viewed as impedance transformers between the feeding waveguide and the surrounding air. Modifying the shape of an acoustic hor

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5

Wadbro, Eddie. "Topology optimization for acoustic wave propagation problems." Licentiate thesis, Uppsala universitet, Avdelningen för teknisk databehandling, 2006. http://urn.kb.se/resolve?urn=urn:nbn:se:uu:diva-86427.

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The aim of this study is to develop numerical techniques for the analysis and optimization of acoustic horns for time harmonic wave propagation. An acoustic horn may be viewed as an impedance transformer, designed to give an impedance matching between the feeding waveguide and the surrounding air. When modifying the shape of the horn, the quality of this impedance matching changes, as well as the angular distribution of the radiated wave in the far field (the directivity). The dimensions of the horns considered are in the order of the wavelength. In this wavelength region the wave physics is c

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6

Lindberg, Erik, and Lukas Magnusson. "WEC Back-to-back Topology." Thesis, Uppsala universitet, Institutionen för teknikvetenskaper, 2018. http://urn.kb.se/resolve?urn=urn:nbn:se:uu:diva-351912.

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7

Pena, Moises. "Geodesics on Generalized Plane Wave Manifolds." CSUSB ScholarWorks, 2019. https://scholarworks.lib.csusb.edu/etd/866.

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A manifold is a Hausdorff topological space that is locally Euclidean. We will define the difference between a Riemannian manifold and a pseudo-Riemannian manifold. We will explore how geodesics behave on pseudo-Riemannian manifolds and what it means for manifolds to be geodesically complete. The Hopf-Rinow theorem states that,“Riemannian manifolds are geodesically complete if and only if it is complete as a metric space,” [Lee97] however, in pseudo-Riemannian geometry, there is no analogous theorem since in general a pseudo-Riemannian metric does not induce a metric space structure on the man

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8

Tingleff, Jens. "Current Mode Wave Active Filters : a topology for high frequency integrated filters." Thesis, Imperial College London, 1994. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.337669.

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9

Otomori, Masaki. "Topology optimization for the micro- and macrostructure designs in electromagnetic wave problems." 京都大学 (Kyoto University), 2013. http://hdl.handle.net/2433/174877.

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10

Langham-Lopez, Jordan. "Coherent states and wave packet dynamics for the Bogoliubov-de Gennes equations." Thesis, University of Nottingham, 2016. http://eprints.nottingham.ac.uk/34172/.

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We investigate generalizations of coherent states as a means of representing the dynamics of excitations of the superconducting ground state. We also analyse the propagation of generalized coherent state wave packets under the Bogoliubov-de Gennes Hamiltonian. The excitations of the superconducting ground state are superpositions of electron and hole quasi-particles described by the Bogoliubov-de Gennes equations, that can only exist at energies outside the band gap. A natural generalization relevant to the excitations of the superconducting ground state is the tensor product of canonical and

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11

Guo, Tong. "Non-Hermitian topological metamaterials to manipulate the acoustic wave propagation." Electronic Thesis or Diss., Université de Lorraine, 2024. http://www.theses.fr/2024LORR0131.

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Cette thèse explore l'intersection entre la physique non-hermitienne et les métamatériaux acoustiques topologiques, en se concentrant sur la manipulation de la propagation des ondes acoustiques dans des systèmes tels que les chaînes de Su-Schrieffer-Heeger et les isolants de Chern. À travers une combinaison de modélisation théorique et de simulations numériques, ce travail démontre comment la perte sur site et les interactions non réciproques peuvent être utilisées pour contrôler la topologie et induire la non-Hermiticité. La thèse explore également une méthode potentielle pour concevoir des i

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12

Friday, Brian Matthew. "VANISHING LOCAL SCALAR INVARIANTS ON GENERALIZED PLANE WAVE MANIFOLDS." CSUSB ScholarWorks, 2019. https://scholarworks.lib.csusb.edu/etd/884.

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Characterizing a manifold up to isometry is a challenging task. A manifold is a topological space. One may equip a manifold with a metric, and generally speaking, this metric determines how the manifold “looks". An example of this would be the unit sphere in R3. While we typically envision the standard metric on this sphere to give it its familiar shape, one could define a different metric on this set of points, distorting distances within this set to make it seem perhaps more ellipsoidal, something not isometric to the standard round sphere. In an effort to distinguish manifolds up to isometr

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13

Disotell, Kevin James. "Low-Frequency Flow Oscillations on Stalled Wings Exhibiting Cellular Separation Topology." The Ohio State University, 2015. http://rave.ohiolink.edu/etdc/view?acc_num=osu1449162356.

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14

Agrawal, Gaurav Medhi Deepankar. "Lightpath topology configuration for wavelength-routed IP/MPLS networks in a multi-layered environment integrated models, algorithms, and analysis /." Diss., UMK access, 2007.

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Thesis (Ph. D.)--School of Computing and Engineering. University of Missouri--Kansas City, 2007.<br>"A dissertation in computer networking and telecommunication networking." Advisor: Deep Medhi. Typescript. Vita. Title from "catalog record" of the print edition Description based on contents viewed Jan. 24, 2008. Includes bibliographical references (leaves 130-138). Online version of the print edition.

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15

Song, Xiaohang [Verfasser], Gerhard [Gutachter] Fettweis, and Giuseppe [Gutachter] Caire. "Millimeter Wave Line-of-Sight Spatial Multiplexing: Antenna Topology and Signal Processing / Xiaohang Song ; Gutachter: Gerhard Fettweis, Giuseppe Caire." Dresden : Technische Universität Dresden, 2019. http://d-nb.info/1227053738/34.

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16

Song, Xiaohang [Verfasser], Gerhard Gutachter] Fettweis, and Giuseppe [Gutachter] [Caire. "Millimeter Wave Line-of-Sight Spatial Multiplexing: Antenna Topology and Signal Processing / Xiaohang Song ; Gutachter: Gerhard Fettweis, Giuseppe Caire." Dresden : Technische Universität Dresden, 2019. http://d-nb.info/1227053738/34.

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17

Razo, López Luis Alberto. "Localisation des ondes électromagnétiques au-delà d'Anderson : rôle des corrélations, des symétries et de la topologie." Electronic Thesis or Diss., Université Côte d'Azur, 2024. http://www.theses.fr/2024COAZ5013.

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Au sens large, le terme de localisation ondulatoire fait référence à un phénomène où les ondes sont spatialement confinées dans de petites régions de l'espace sans la contrainte de barrières matérielles. Dans cette thèse, nous étudions (analytiquement, numériquement et expérimentalement) différents mécanismes physiques collectifs pour localiser spatialement, et donc pour contrôler les ondes électromagnétiques. En particulier, nous nous concentrons sur le rôle des potentiels non corrélés et corrélés, ainsi que sur des effets topologiques pour réaliser le confinement des ondes. Les études analyt

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18

Del, Broccolo Simone. "Effets de la topologie des cellules d'une structure en nid d'abeille." Thesis, Bourgogne Franche-Comté, 2020. http://www.theses.fr/2020UBFCD001.

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Les panneaux composites sandwich possédant une âme nid d'abeille permettent de disposer à la fois de propriétés statiques hors plan intéressantes (en raison de leur rigidité équivalente élevée) et de caractéristiques de masses faibles. Pour cette raison, ils sont largement utilisés dans les industries aérospatiale, automobile et navale. Les environnements dans lesquels ces matériaux sont utilisés mettent en jeu des efforts dans des gammes de fréquences larges. Si un rapport rigidité / masse élevé est profitable dans le domaine des basses fréquences, il conduit généralement à des comportements

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19

Chopinaud, Aurélien. "Atomes et vortex optiques : conversion de moments orbitaux de lumière en utilisant la transition à deux photons 5S-5D du rubidium." Thesis, Université Paris-Saclay (ComUE), 2018. http://www.theses.fr/2018SACLS155/document.

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Le moment orbital angulaire (OAM) de la lumière est une grandeur quantifiée associée à la phase d’un vortex optique et est actuellement une des variables explorées pour les technologies quantiques.Dans ce contexte, cette thèse étudie expérimentalement la conversion de vortex optiques par une vapeur de rubidium, via la transition Raman stimulée à deux photons 5S₁/₂ − 5D₅/₂. Quand les atomes sont soumis à deux lasers respectivement à 780 nm et 776 nm, ils génèrent des rayonnements cohérents, infrarouge à 5,23 μm et bleu à 420 nm. On examine le rayonnement bleu lorsque l’un des lasers ou les deux

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20

Zuberovic, Aida. "Surface Modified Capillaries in Capillary Electrophoresis Coupled to Mass Spectrometry : Method Development and Exploration of the Potential of Capillary Electrophoresis as a Proteomic Tool." Doctoral thesis, Uppsala universitet, Analytisk kemi, 2009. http://urn.kb.se/resolve?urn=urn:nbn:se:uu:diva-9554.

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The increased knowledge about the complexity of the physiological processes increases the demand on the analytical techniques employed to explore them. A comprehensive analysis of the entire sample content is today the most common approach to investigate the molecular interplay behind a physiological deviation. For this purpose a method that offers a number of important properties, such as speed and simplicity, high resolution and sensitivity, minimal sample volume requirements, cost efficiency and robustness, possibility of automation, high-throughput and wide application range of analysis is

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21

Kailasvuori, Janik. "Quasiparticles in the Quantum Hall Effect." Doctoral thesis, Stockholm : Department of Physics, Stockholm University, 2006. http://urn.kb.se/resolve?urn=urn:nbn:se:su:diva-1250.

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22

Batista, Edson Anibal de Macedo Reis. "Estudo da topologia de redes de conex?o funcional no c?rtex sensorial prim?rio e hipocampo durante o sono de ondas lentas." Universidade Federal do Rio Grande do Norte, 2013. http://repositorio.ufrn.br:8080/jspui/handle/123456789/15492.

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Made available in DSpace on 2014-12-17T14:56:17Z (GMT). No. of bitstreams: 1 EdsonAMRB_DISSERT.pdf: 7502344 bytes, checksum: 78d70443ae2fd9033fe78b23c5cbd811 (MD5) Previous issue date: 2013-07-30<br>Coordena??o de Aperfei?oamento de Pessoal de N?vel Superior<br>Complex network analysis is a powerful tool into research of complex systems like brain networks. This work aims to describe the topological changes in neural functional connectivity networks of neocortex and hippocampus during slow-wave sleep (SWS) in animals submited to a novel experience exposure. Slow-wave sleep is an important sl

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23

Paula, Marcos Barros de. "Invariantes de frentes de ondas planas." Universidade Federal de Viçosa, 2010. http://locus.ufv.br/handle/123456789/4905.

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Made available in DSpace on 2015-03-26T13:45:32Z (GMT). No. of bitstreams: 1 texto completo.pdf: 1925307 bytes, checksum: 997942bc96f9ea8502e3844a314cbc0b (MD5) Previous issue date: 2010-04-30<br>Coordenação de Aperfeiçoamento de Pessoal de Nível Superior<br>This dissertation is devoted to the study of wave planar fronts following the work developed by Aicardi in [Ai1]. She finds theses invariantsas a generalization of those introduced by Arnold for plane curves by using the Vassiliev Theory. In this work, we study and describe Aicardi's invariants as well as their properties. Moreover, by u

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24

Song, Xiaohang. "Millimeter Wave Line-of-Sight Spatial Multiplexing: Antenna Topology and Signal Processing." Doctoral thesis, 2018. https://tud.qucosa.de/id/qucosa%3A33198.

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Fixed wireless communication is a cost-efficient solution for flexible and rapid front-/backhaul deployments. Technologies including dual polarization, carrier aggregation, and higher order modulation schemes have been developed for enhancing its throughput. In order to better support the massive traffic increment during network evolution, novel wireless backhaul solutions with possible new dimensions in increasing the spectral efficiency are needed. Line-of-Sight (LoS) Multiple-Input-Multiple-Output (MIMO) communication is such a promising candidate allowing the throughput to scale linearly w

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25

"Topology optimization for wave propagation and vibration phenomena in elastic and piezoelectric solids." UNIVERSITY OF COLORADO AT BOULDER, 2010. http://pqdtopen.proquest.com/#viewpdf?dispub=3366657.

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26

Ray, Sayonee. "Topology and Quantum Phases of Low Dimensional Fermionic Systems." Thesis, 2017. http://etd.iisc.ac.in/handle/2005/3568.

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In this thesis, we study quantum phase transitions and topological phases in low dimensional fermionic systems. In the first part, we study quantum phase transitions and the nature of currents in one-dimensional systems, using eld theoretic techniques like bosonization and renormalization group. This involves the study of currents in Luttinger liquids, and the fate of a persistent current in a 1D system. In the second part of the thesis, we study the different types of Majorana edge modes in a 1D p-wave topological superconductor. Further we extend our analysis to the e ect of an additional s-

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27

Ray, Sayonee. "Topology and Quantum Phases of Low Dimensional Fermionic Systems." Thesis, 2017. http://etd.iisc.ernet.in/2005/3568.

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In this thesis, we study quantum phase transitions and topological phases in low dimensional fermionic systems. In the first part, we study quantum phase transitions and the nature of currents in one-dimensional systems, using eld theoretic techniques like bosonization and renormalization group. This involves the study of currents in Luttinger liquids, and the fate of a persistent current in a 1D system. In the second part of the thesis, we study the different types of Majorana edge modes in a 1D p-wave topological superconductor. Further we extend our analysis to the e ect of an additional s-

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28

Chen, Jian-Ying, and 陳建盈. "Implementations on fT-Doubler Topology for Millimeter-Wave Voltage Controlled Oscillator and Injection Locked Frequency Divider." Thesis, 2013. http://ndltd.ncl.edu.tw/handle/58820162325657153547.

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碩士<br>國立中央大學<br>電機工程學系<br>101<br>The thesis studies two subjects. The first one is on millimeter-wave voltage controlled oscillator (VCO) design where two V-band VCOs are demonstrated. The second one is on injection locked frequency divider (ILFD) design where a K-band ILFD is demonstrated. The circuits were implemented in tsmcTM 90-nm CMOS and tsmcTM 0.18-μm CMOS technologies. The first part of this thesis presents two millimeter-wave VCOs using the fT-doubler cell. The proposed novel V-band fT-doubler VCO is implemented in tsmcTM 90-nm CMOS technology, which performs low power dissipation an

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29

Deb, Oindrila. "Studies of Topological Phases of Matter : Presence of Boundary Modes and their Role in Electrical Transport." Thesis, 2017. http://etd.iisc.ac.in/handle/2005/3571.

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Topological phases of matter represent a new phase which cannot be understood in terms of Landau’s theory of symmetry breaking and are characterized by non-local topological properties emerging from purely local (microscopic) degrees of freedom. It is the non-trivial topology of the bulk band structure that gives rise to topological phases in condensed matter systems. Quantum Hall systems are prominent examples of such topological phases. Different quantum Hall states cannot be distinguished by a local order parameter. Instead, non-local measurements are required, such as the Hall conductance,

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30

Deb, Oindrila. "Studies of Topological Phases of Matter : Presence of Boundary Modes and their Role in Electrical Transport." Thesis, 2017. http://etd.iisc.ernet.in/2005/3571.

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Topological phases of matter represent a new phase which cannot be understood in terms of Landau’s theory of symmetry breaking and are characterized by non-local topological properties emerging from purely local (microscopic) degrees of freedom. It is the non-trivial topology of the bulk band structure that gives rise to topological phases in condensed matter systems. Quantum Hall systems are prominent examples of such topological phases. Different quantum Hall states cannot be distinguished by a local order parameter. Instead, non-local measurements are required, such as the Hall conductance,

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