Relevant bibliographies by topics / Excitation of even modes / Dissertations / Theses
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Dissertations / Theses on the topic 'Excitation of even modes'

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Published: 6 September 2023

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1

Kumar, Pawan Goldreich Peter Martin. "Excitation and damping of solar p-modes /." Diss., Pasadena, Calif. : California Institute of Technology, 1988. http://resolver.caltech.edu/CaltechETD:etd-09092008-090628.

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2

Bryan-Brown, Guy Peter. "Optical excitation of electromagnetic modes using grating coupling." Thesis, University of Exeter, 1991. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.280664.

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3

Strojny, Brandan Thomas. "EXCITATION AND ANALYSIS OF CHARACTERISTIC MODES ON COMPLEX ANTENNA STRUCTURES." The Ohio State University, 2011. http://rave.ohiolink.edu/etdc/view?acc_num=osu1301006813.

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4

Wang, Feng. "Modes, Excitation and Applications of Plasmonic Nano-apertures and Nano-cavities." Kent State University / OhioLINK, 2012. http://rave.ohiolink.edu/etdc/view?acc_num=kent1348588159.

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5

Chen, Yi. "Propagation and Excitation of Electromagnetic Modes for Travelling-wave MRI Applications." The Ohio State University, 2016. http://rave.ohiolink.edu/etdc/view?acc_num=osu1449158025.

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6

Lamriben, Cyril. "Transferts anisotropes d'énergie en turbulence en rotation et excitation de modes d'inertie." Phd thesis, Université Paris Sud - Paris XI, 2012. http://tel.archives-ouvertes.fr/tel-00734192.

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Nous présentons une étude expérimentale de l'influence d'une rotation d'ensemble sur le déclin d'un écoulement turbulent dans une géométrie confinée. L'écoulement est généré en translatant rapidement une grille dans un récipient parallélépipédique, et nous mesurons les champs de vitesse dans un plan vertical (parallèle à l'axe de rotation) grâce à un dispositif de PIV embarqué. Nous montrons dans un premier temps qu'une partie significative de l'énergie est contenue dans un écoulement moyen reproductible, qui s'identifie à une superposition de modes d'inertie résonnants de la cuve. Le couplage
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7

Elston, Stephen John. "Characterisation of ferroelectric liquid crystal layers by the excitation of optic modes." Thesis, University of Exeter, 1990. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.277166.

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8

Al-Anbaki, Atheer Faisal Hameed. "Footfall excitation of higher modes of vibration in low-frequency building floors." Thesis, University of Exeter, 2018. http://hdl.handle.net/10871/34081.

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This thesis investigates the footfall excitation of higher modes of vibration in low-frequency floor structures. This is motivated by the increased number of floors reportedly failing to meet the required occupants comfort level although being designed in accordance with the current state-of-the-art design guidelines. In particular modern, lightweight, and slender floor structures. The contribution to knowledge of this thesis can be summarised as: quantifying the signal energy of measured walking forces within and above the natural frequency cut-off proposed by the current state-of-the-art des
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9

Novikau, Ivan [Verfasser]. "Excitation and damping mechanisms of geodesic acoustic modes in tokamaks / Ivan Novikau." Ulm : Universität Ulm, 2020. http://d-nb.info/121694928X/34.

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10

Zarzuela, Fernández Ricardo. "Novel quantum phenomena and excitation modes in type-I superconductors and magnetic vortices." Doctoral thesis, Universitat de Barcelona, 2014. http://hdl.handle.net/10803/285263.

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The aim of this thesis was to study quantum phenomena and excitation modes in type-I superconductors and magnetic vortices. The intermediate state in type-I superconductors is characterized by the gradual penetration of magnetic flux and the coexistence of normal and superconducting domains. This thermodynamic phase shows a magnetic irreversibility of topological origin, even in the case of defect-free samples. This irreversibility has been explored in disk-shaped samples made of lead (the prototype of a type-I superconductor) using a magnetic field applied perpendicularly to the disk plan
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11

Donipudi, Raghunandan K. "Self referencing SPR sensor by simultaneous excitation of long and short range surface plasmon modes." Lexington, Ky. : [University of Kentucky Libraries], 2006. http://lib.uky.edu/ETD/ukyelen2006t00468/RaghunandanDonipudi%5FMSThesis.pdf.

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Thesis (M.S.)--University of Kentucky, 2006.<br>Title from document title page (viewed on August 22, 2006). Document formatted into pages; contains: x, 56 p. : ill. (some col.). Includes abstract and vita. Includes bibliographical references (p. 54-55).
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12

Etourneau, Karine. "Etude de l'interface coeur/gaine des fibres optiques polymères par excitation de modes de galerie." Limoges, 1996. http://www.theses.fr/1996LIMO0020.

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Les procedes de fabrication des fibres optiques polymeres et leur vieillissement sont susceptibles de degrader la qualite de l'interface cur/gaine. Mon travail a consiste a elaborer des methodes d'optique guidee permettant l'etude de cette interface. L'idee de depart a ete de considerer que la puissance diffusee en raison de ces defauts le long de la fibre est proportionnelle a celle qui est guidee. Le but a alors ete d'injecter l'energie a proximite de l'interface et d'etudier sa propagation. Nous avons d'abord analyse la possibilite d'etudier l'interface en injectant, sur la face d'entree de
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13

Orucevic, Fedja. "Production de microtores de silice sur silicium : excitation et caractérisation de leurs modes de galerie." Paris 6, 2007. http://www.theses.fr/2007PA066642.

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Les microtores de silice sur les puces de silicium sont un nouveau type de microcavités à modes de galerie. Dans la double filiation des microsphères de silice et des microdisques de GaAs, ils en combinent les avantages, soit la très haute surtension des cavités de silice fondue (Q ~ 107 – 109), et les faibles volumes accessibles par les microcavités intégrées (V~ 100*(lambda/N)3), ce qui fait d’eux des composants idéaux pour les expériences d’électrodynamique quantique en cavité et d’optique non-linéaire. L’intégration des microtores découle de leur méthode de fabrication qui implique success
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14

PANZERI, NICOLA. "NONLINEAR WAVES EXCITATION AND INTERACTION IN PURE ELECTRON PLASMAS." Doctoral thesis, Università degli Studi di Milano, 2021. http://hdl.handle.net/2434/814967.

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Nonneutral plasmas are excellent subjects for well controlled studies on basic physics problems and industrial research over a wide range of parameters. For the long-time confinement, merger and recombination of antimatter, the method of choice is some variant of the Penning-Malmberg trap, and many of the techniques for the manipulation of charged particles, such as cooling, compression, transfer, and ultimately a stable confinement in a quiescent state, are based on methods first developed by the nonneutral plasma community using electron plasmas. Another fascinating properties of nonneutral
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15

Fraser, Michael John. "Optical Fiber Microstructures for Self-Contained Whispering Gallery Mode Excitation." Diss., Virginia Tech, 2016. http://hdl.handle.net/10919/73659.

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Optical resonators, which confine light by resonant recirculation, serve as the basis for a wide variety of optical components. Though they appear in many geometric forms, the most effective of optical resonators show axial symmetry in at least one dimension. A popular variation that finds broad application is the dielectric sphere. Acclaimed for their high quality (Q) factor and small modal volume, spheres owe credit of these attractive features to their support of whispering gallery mode (WGM) resonances. The sensitivity of a resonance's frequency and Q to strain, temperature, and other para
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16

Li, Ran. "Molecular Characterization of Human Tissue Samples by Raman Spectroscopy with Different Laser Modes and Excitation Wavelengths." The Ohio State University, 2013. http://rave.ohiolink.edu/etdc/view?acc_num=osu1365419543.

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17

Candéla, Yves. "Microcavités de silice : Excitation par fibre des modes de galerie et fonctionnalisation par des nanocristaux de silicium." Phd thesis, Université Pierre et Marie Curie - Paris VI, 2011. http://tel.archives-ouvertes.fr/tel-00658670.

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Cette thèse exploite les modes de galerie de microcavités optiques, qui résultent d'un guidage par réflexion totale interne et possèdent des facteurs de qualité très élevés et de faibles volumes modaux. Ce mémoire rappelle dans un premier temps la description théorique des modes des microsphères et des microtores de silice. Leur fabrication est ensuite présentée, en soulignant les améliorations apportées au cours de la thèse, notamment la production de sphères de diamètre inférieur à 20 μm, et l'amélioration de la symétrie des tores à l'aide d'une polarisation circulaire. Nous présentons une é
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18

Donlagić, Denis. "Microbend sensor structure based on selective excitation and filtering of the modes in graded index optical fibres." Thesis, University of Strathclyde, 2000. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.248635.

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19

Dubreuil, Nicolas. "Excitation par fibre optique et cartographie en champ proche des modes de galerie de microsphères de silice." Rennes 1, 1997. http://www.theses.fr/1997REN10161.

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Ce travail de these porte sur l'etude des modes de galerie de tres haute surtension observes dans des microspheres de silice dont le diametre varie entre 50 et 400 microns. La lumiere peut se propager le long de l'equateur dans une serie de reflexions totales internes tout en restant confinee dans un anneau dont les dimensions transverses sont de l'ordre de la longueur d'onde. Ces proprietes peuvent etre mises a profit dans des experiences fondamentales d'electrodynamique en cavite, pour obtenir des effets d'optique non-lineaire a faible seuil ou encore pour des applications interessant le dom
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20

Yoshida, Kenichi. "Pair correlation and continuum coupling effects on low-frequency modes of excitation in deformed neutron-rich nuclei." 京都大学 (Kyoto University), 2007. http://hdl.handle.net/2433/136769.

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21

Schoth, Mario [Verfasser], Andreas [Akademischer Betreuer] Knorr, and Thomas [Akademischer Betreuer] Renger. "Theory of excitation transfer in nanostructures influenced by vibrational modes / Mario Schoth. Gutachter: Andreas Knorr ; Thomas Renger. Betreuer: Andreas Knorr." Berlin : Technische Universität Berlin, 2014. http://d-nb.info/1067387749/34.

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22

El, Hami Khalil. "Excitation selective des modes de vibration d'un cantilever en utilisant les proprietes piezoelectriques et electrostrictives du coplymere p(vdf/trfe)." Besançon, 1996. http://www.theses.fr/1996BESA2062.

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Nous avons decrit une methode pour augmenter la sensibilite du capteur de force resonnant. L'excitation du cantilever avec un polymere piezoelectrique place dans des endroits sensible et precis afin de selectionner une haute frequence de resonance de vibration du cantilever. La frequence de resonance eleve est souhaitable pour augmenter la sensibilite du gradient de force ressenti entre les deux aimants. Dans l'autre partie de la these, nous nous sommes interesses a l'electrostriction du copolymere polyfluorure de vinylidene et trifluoroethylene p(vdf/trfe). En presence d'un champs electrique,
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23

Yao, Jing. "Characterization of Mechanical Properties of Thin-Film Li-Ion BatteryElectrodes from Laser Excitation and Measurements ofZero-Group Velocity Resonances." BYU ScholarsArchive, 2019. https://scholarsarchive.byu.edu/etd/7128.

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The mechanical properties of thin-film Li-ion battery electrodes are controlled by the micro structure of the constituent materials. In this work, a non-contact and non-destructive measurement of the mechanical properties of electrode films is performed by measurement of zero group velocity (ZGV) resonances. The ZGV Lamb wave modes of a solid bi-layer consisting of a thin metallic layer and a thin compliant coating layer are shown to be dependent on the Young's moduli, thicknesses, densities and Poisson ratios of the layers. Theoretical models are used to quantify the sensitivity of the ZGV re
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24

Maury, Rémy. "Réponse d'un jet rond subsonique à une excitation fluidique stationnaire et instationnaire." Thesis, Poitiers, 2012. http://www.theses.fr/2012POIT2272.

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Ce travail tente d'analyser la réponse d'une jet axisymétrique turbulent à une excitation fluidique stationnaire et instationnaire lorsque le contenu fréquentiel et aziumutal (!,m) de la perturbation est maîtrisé. Le dispositif de contrôle utilisé est composé de 16 microjets ronds répartis sur le bord de fuite de la tuyère. L'utilisation des microjets provoque une réduction du champ acoustique rayonné (particulièrement pour le cas de contrôle stationnaire). Le champ aérodynamique est ensuite sondé grâce à des mesures fil chaud et PIV stéréoscopique résolue en temps. L'excitation instationnaire
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25

Hatayama, Ken. "Excitation of secondary Love and Rayleigh waves in a three-dimensional sedimentary basin evaluated by direct boundary method with normal modes." 京都大学 (Kyoto University), 1997. http://hdl.handle.net/2433/198904.

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26

London, Lionel. "On gravitational wave modeling: numerical relativity data analysis, the excitation of kerr quasinormal modes, and the unsupervised machine learning of waveform morphology." Diss., Georgia Institute of Technology, 2015. http://hdl.handle.net/1853/53973.

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The expectation that light waves are the only way to gather information about the distant universe dominated scientific thought, without serious alternative, until Einstein’s 1916 proposal that gravitational waves are generated by the dynamics of massive objects. Now, after nearly a century of speculation, theoretical development, observational support, and finally, tremendous experimental preparation, there are good reasons to believe that we will soon directly detect gravitational waves. One of the most important of these good reasons is the fact that matched filtering enables us to dig grav
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27

Wen, Jing [Verfasser], and Bernhard [Akademischer Betreuer] Schmauss. "Excitation and Detection of Highly Confined Plasmonic Gap Modes with Subwavelength Dimensions = Anregung und Detektion hochlokalisierter plasmonischer Gap-Moden mit Subwellenlängendimensionen / Jing Wen. Betreuer: Bernhard Schmauss." Erlangen : Universitätsbibliothek der Universität Erlangen-Nürnberg, 2011. http://d-nb.info/1018308938/34.

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28

Jossent, Mathieu. "Développement de fibres optiques à dispersion contrôlée pour l'élaboration de lasers ultrarapides à 2 µm." Thesis, Limoges, 2017. http://www.theses.fr/2017LIMO0016/document.

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L’objectif de cette thèse est d’ouvrir la voie à la démonstration de l’amplification parabolique à 2 μm en format tout fibré. La théorie sur l’amplification d’impulsions auto-similaires est d’abord présentée. Il en découle que le meilleur amplificateur tout fibré à 2 μm devra s’appuyer sur une fibre dopée aux ions Tm3+ présentant à la fois une forte dispersion normale et une grand aire effective. L’amplification parabolique ne peut pas être réalisée dans des fibres monomodes à base de silice à 2 μm du fait de la forte dispersion anormale présentée par le matériau. Afin de surmonter cette limit
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29

Baboux, Florent. "Effets spin-orbite géants sur les modes collectifs de spin de puits quantiques." Phd thesis, Université Pierre et Marie Curie - Paris VI, 2013. http://tel.archives-ouvertes.fr/tel-01020564.

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Cette thèse est consacrée à l'étude des effets du couplage spin-orbite dans des puits quantiques semi-conducteurs dopés (GaAs et CdMnTe), par spectroscopie Raman électronique. Dans ces structures existent des champs magnétiques intrinsèques (Dresselhaus et Rashba). Ces champs offrent des moyens attractifs pour manipuler le spin des électrons, mais contribuent aussi à la relaxation de spin via leur dépendance avec le vecteur d'onde de l'électron (mécanisme D'yakonov-Perel'). Nous montrons que pour les modes collectifs de spin de puits quantiques, le scénario destructif D'yakonov-Perel' est tran
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30

Chelda, Samir. "Simulation du parcours des électrons élastiques dans les matériaux et structures. Application à la spectroscopie du pic élastique multi-modes MM-EPES." Phd thesis, Université Blaise Pascal - Clermont-Ferrand II, 2010. http://tel.archives-ouvertes.fr/tel-00629659.

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La spectroscopie EPES (Elastic Peak Electron Spectroscopy) permet de mesurer le pourcentage he d'électrons rétrodiffusés élastiquement par la surface d'un échantillon soumis à un bombardement électronique. C'est une méthode non destructive et extrêmement sensible à la surface. L'objectif de ce travail est de modéliser le cheminement des électrons élastiques dans la matière grâce à une simulation informatique basée sur la méthode Monte Carlo. Cette simulation contribue de manière essentielle à la connaissance et à l'interprétation des résultats expérimentaux obtenus par spectroscopie EPES. Nous
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Maatoug, Tarak. "Synthèse d'observateurs adaptatifs pour les systèmes non linéaires." Phd thesis, Université de Caen, 2009. http://tel.archives-ouvertes.fr/tel-01058802.

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Dans cette thèse, nous proposons la synthèse d'observateurs adaptatifs pour certaines classes de systèmes non linéaires multi-sorties uniformément observables. Dans un premier temps, les systèmes avec une paramétrisation linéaire sont considérés. Ensuite, les résultats obtenus ont été étendus au cas de paramétrisation non linéaire. La caractéristique principale des observateurs proposés réside dans le fait que leur gain fait intervenir une fonction de synthèse dont le choix permet d'obtenir différents types d'observateurs tels que des observateurs de type grand gain classiques ou à modes gliss
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32

Cikojević, Viktor. "Ab-initio quantum Monte Carlo study of ultracold atomic mixtures." Doctoral thesis, Universitat Politècnica de Catalunya, 2021. http://hdl.handle.net/10803/672119.

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The properties of mixtures of Bose-Einstein condensates at T=0 have been investigated using quantum Monte Carlo (QMC) methods and Density Functional Theory (DFT) with the aim of understanding physics beyond the mean-field theory in Bose-Bose mixtures. In particular, quantum liquid droplets with attractive intraspecies and repulsive interspecies attraction were studied, for which we observed significant contributions beyond Lee Huang Yang (LHY) theory that affect the energy, saturation density, and surface tension. The critical atom number in droplets in free space for total number of atoms N b
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33

Akra, Mirna. "Etude de filtres RF planaires miniatures. Amélioration de la réjection hors-bande et accordabilité." Thesis, Grenoble, 2014. http://www.theses.fr/2014GRENT024/document.

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Le but de ce travail était de développer des filtres passe-bande RF dans la technologie de PCB, avec trois objectifs principaux. Le premier objectif était de développer des formules de synthèse tosimplify la procédure de conception du filtre. Le deuxième était de parvenir à un rejet wideout bande sans modifier les caractéristiques de la bande de filtrage. Le troisième objectif est de contrôler la fréquence centrale du filtre en utilisant diode varicap<br>The purpose of this work was to develop RF bandpass filters in PCB technology,with three main objectives. The first objective was to develop
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34

Belkadi, Nesrine. "Nouveaux MEMS C-BAR : résonateurs capacitifs à ondes élastiques de volume piégées sur substrat Silicium." Thesis, Besançon, 2016. http://www.theses.fr/2016BESA2088.

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Ces travaux de thèse décrivent l’étude et la réalisation de résonateurs MEMS (Micro-ElectroMechanical Systems) acoustiques à couplage capacitif dits C-BAR (Capacitive Bulk Acoustic Resonator). Les C-BAR exploitent les modes d’extension-compression d’épaisseur en mode fondamental à 9, 45MHz. L’élément vibrant est constitué de Si-monocristallin purement résistif et d’orientation (100). Notre but consiste à transposer au monde des MEMS a` excitation capacitive les caractéristiques de stabilité des résonateurs piézoélectriques BAW utilisés dans les sources de fréquences embarquées. Notre stratégie
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Kika, Ondřej. "Kmitání štíhlých mostních konstrukcí." Doctoral thesis, Vysoké učení technické v Brně. Fakulta stavební, 2016. http://www.nusl.cz/ntk/nusl-355606.

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Doctoral thesis called Vibrations of slender bridge structures deals with comparison of constructions’ responses at different load model of pedestrians. Specifically, in practice commonly used model, where there are the effects of pedestrians replaced by forces acting in a certain place on the bridge and other model, which takes into account the load of pedestrians moving along the deck. Calculations of responses are performed by finite element method in program ANSYS. To obtain extreme values of responses It is used parametric calculation using the program OptiSlang. At first responses on the
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FRANCESCHINI, PAOLO. "NOVEL SCHEMES FOR ULTRAFAST MANIPULATION OF QUANTUM MATERIALS." Doctoral thesis, Università Cattolica del Sacro Cuore, 2022. http://hdl.handle.net/10280/111822.

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La possibilità di controllare le proprietà elettroniche on-demand su una scala di tempo ultraveloce rappresenta una delle sfide più intriganti verso la realizzazione di dispositivi fotonici ed elettronici di nuova generazione. Stimolata da questo, negli ultimi decenni la ricerca scientifica ha concentrato la propria attenzione su diverse piattaforme a stato solido. Tra tutte, nanostrutture dielettriche (e metamateriali) e materiali correlati si presentano come i più promettenti candidati per la realizzazione di dispositivi dotati di nuove funzionalità. Al di là delle caratteristiche specifiche
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NGUYEN-THI, Van-Oanh. "SPECTROSCOPIE ET STABILITE DES HYDROCARBURES AROMATIQUES POLYCYCLIQUES DANS LES CONDITIONS DU MILIEU INTERSTELLAIRE." Phd thesis, Université Paris Sud - Paris XI, 2003. http://tel.archives-ouvertes.fr/tel-00005244.

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Ce travail porte sur la dynamique intramoléculaire des Hydrocarbures Aromatiques Polycycliques soumis aux conditions du milieu interstellaire (PAH isolé rotationnellement froid mais vibrationnellement excité). Des études théoriques et expérimentales ont été menées sur leur deux voies de relaxation: émission IR ou fragmentation. Le spectre d'absorption IR a été obtenu par dynamique moléculaire couplée à une méthode semi-classique Adiabatic Switching. La dynamique a été réalisée sur une surface de potentiel semi-empirique Tight-Binding dans le but de simuler tous types de PAHs pouvant dépasser u
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38

Pribac, Fred. "Octupole vibrational states in the even-mass barium isotopes." Master's thesis, 1985. http://hdl.handle.net/1885/138661.

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39

Kumar, Pawan. "Excitation and Damping of Solar P-Modes." Thesis, 1988. https://thesis.library.caltech.edu/3407/3/Kumar_p_1988.pdf.

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<p>I have carried out detailed analysis of the interaction of acoustic radiation with homogeneous turbulence in order to understand the excitation of solar p-modes by turbulent convection. The most significant outcome of this investigation is the finding that, for certain types of forced turbulences, the absorption of acoustic waves is no greater than a free turbulence, whereas the emission is always enhanced by a factor M⁻², where M is the Mach number of the turbulence. Turbulent convection in the sun is an example of this kind of turbulence. This leads to the conclusion that energies in sola
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40

Jaber, Nizar. "Higher Order Modes Excitation of Micro Cantilever Beams." Thesis, 2014. http://hdl.handle.net/10754/317259.

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In this study, we present analytical and experimental investigation of electrically actuated micro cantilever based resonators. These devices are fabricated using polyimide and coated with chrome and gold layers from both sides. The cantilevers are highly curled up due to stress gradient, which is a common imperfection in surface micro machining. Using a laser Doppler vibrometer, we applied a noise signal to experimentally find the first four resonance frequencies. Then, using a data acquisition card, we swept the excitation frequency around the first four natural modes of vibrations. Theoreti
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41

Chen, Tai-Lee, and 陳泰利. "Aperture-Coupling Excitation and Mode-Coupling Phenomena of Microstrip Leaky Modes." Thesis, 1999. http://ndltd.ncl.edu.tw/handle/09419710206436045739.

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博士<br>國立交通大學<br>電子工程系<br>87<br>This thesis investigates the properties and applications of the first two higher order leaky modes of the microstrip, which include efficient feeding structures, mutual coupling on microstrips, coupling effect in different leaky modes, and several antenna applications. The spectral domain analysis is employed to solve the propagation characteristics of the microstrip leaky modes throughout this study. The first part of the thesis pertains to the first higher order leaky mode (odd mode) of the microstrip line. The design procedure of the microstrip f
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LIN, CHENG-HUNG, and 林政宏. "Excitation of multivane waveguide modes by a thin axis encircling E-layer." Thesis, 2002. http://ndltd.ncl.edu.tw/handle/21231442898720296421.

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碩士<br>國立海洋大學<br>電機工程學系<br>90<br>The technology to produce high-power microwave by using the theory of the relativistic electrons spans a wide range of application to high-power microwave radar system, cyclotron resonance heating of plasma for fusion reactor, acceleration for basic research, etc. In many microwave devices, electron cyclotron tube has become the choice for microwave source over the years. And the Gyrotron is applied widely .When they are operated at the fundamental mode, a rather highly applied magnetic field is required at high frequency. Later scholars make some ch
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Jiue-JiaWu and 吳珏佳. "Assessment of effects of attenuation and excitation modes on ultrasonic Nakagami parameter." Thesis, 2014. http://ndltd.ncl.edu.tw/handle/50728788739319787797.

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碩士<br>國立成功大學<br>資訊工程學系<br>102<br>Statistical models, frequently adopted for describing the probability distribution function (PDF) of ultrasonic backscattered envelopes, have been utilized for tissue characterization. Due to the attenuation increase with ultrasonic frequency, the estimated statistical parameter can be affected by the broad-band attenuation in tissues and distortion of acquired echo signals. Hence, different ultrasonic frequencies and excitation signals were implemented to investigate the attenuation effect on statistical analysis of ultrasonic backscattered signals. Measuremen
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LIN, YUAN-TANG, and 林源堂. "Nonlinear interaction of instability modes for an axisymmetric circular jet under acoustic excitation." Thesis, 1991. http://ndltd.ncl.edu.tw/handle/26475454203617190835.

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Ho, Fei-hung, and 何飛宏. "Poincaré Gauge Theory with Coupled Even and Odd Parity Spin-0 Dynamic Connection Modes: Isotropic Bianchi Cosmologies." Thesis, 2011. http://ndltd.ncl.edu.tw/handle/46479753624576973355.

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博士<br>國立中央大學<br>物理研究所<br>99<br>We are investigating the dynamics of a new Poincaré gauge theory of gravity model,the BHN PG model which has cross coupling between the spin-0^+ and spin-0^- modes, in a situation which is simple, non-trivial, and yet may give physically interesting results that might be observable. To this end we here consider a very appropriate situation—homogeneous-isotropic cosmologies—which is relatively simple, and yet all the modes have non-trivial dynamics which reveals physically interesting and possibly observable results. More specifically we consider manifestly isotro
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Huang, Cheng-ren, and 黃正仁. "Excitation of whispering gallery modes in a microsphere by an etch-eroded fiber coupler." Thesis, 2007. http://ndltd.ncl.edu.tw/handle/96497475695725689681.

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碩士<br>國立中央大學<br>光電科學研究所<br>95<br>Microsphere resonators have attracted a lot of interest in recent years, due to ultra high quality factor and small modal volume. Numerous methods for coupling energy into the whispering gallery modes of a microsphere have been demonstrated, however most of them are limited by either low coupling efficiency or mechanical instability. In this thesis, an etch-eroded fiber coupler was investigated, and better coupling efficiency and acceptable stability was obtained. The orders of the WGMs and the quality factors can be determined by analyzing optical transmission
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Chen, Yong-Zhi, and 陳泳智. "Excitation of fundamental whispering-gallery modes in a microsphere by a half-block coupler." Thesis, 2007. http://ndltd.ncl.edu.tw/handle/46630769027455963367.

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碩士<br>國立中央大學<br>光電科學研究所<br>95<br>A simple method for the excitation of fundamental whispering-gallery modes in a BK7 glass microsphere by a side-polished fiber half-block coupler is demonstrated. The coupler is made of the single-mode fiber (Corning SMF-28) which has an effective refractive index of 1.4682 @1550nm. The radius and refractive index of the microsphere equal to 150± 1.5 um and 1.500065 @1550 nm, respectively. The resonant modes are identified from the transmission spectrum, which indicates that the quality factor of 17000, free spectral range of 1.7 nm and coupling efficiency of 1
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Deepu, P. "Dynamics of Droplets Under Support, Acoustic And/Or Ambient Flow Excitation." Thesis, 2013. http://etd.iisc.ernet.in/2005/3459.

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The first step on the way to understanding the complicated dynamics of spray is to study the behavior of isolated droplets. In many industrial and natural processes such as turbulent combustion, agricultural sprays, spray cooler, falling raindrops and cloud evolution the droplet is subjected to a chaotic unsteady external flow field. The interaction between the liquid and gaseous phases results in very intricate droplet dynamics like capillary instabilities, atomization, droplet collision and coalescence and vaporization, to name a few. In this dissertation, the focus is on shape oscillations,
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Islam, Rubaiyat. "Theory and Applications of Microstrip/Negative-refractive-index Transmission Line (MS/NRI-TL) Coupled-line Couplers." Thesis, 2011. http://hdl.handle.net/1807/31789.

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The electromagnetic coupling of a microstrip transmission line (MS-TL) to a metamaterial backward wave Negative-Refractive-Index transmission line (NRI-TL) is the primary investigation of this dissertation. The coupling of forward waves in the MS-TL to the backward waves in the NRI-TL results in the formation of complex modes, characterized by simultaneous phase progression and attenuation along the lossless lines. Through network-theoretic considerations, we investigate the properties of these modes in the complex-frequency plane of the Laplace domain to help unravel the confusion that has e
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Lenk, Benjamin. "Photo-magnonics in two-dimensional antidot lattices." Doctoral thesis, 2012. http://hdl.handle.net/11858/00-1735-0000-000D-F098-8.

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