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Dissertations / Theses on the topic 'Spectral shape'

Author: Grafiati

Published: 4 June 2021

Last updated: 26 July 2025

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1

Ribeiro, Eraldo. "Spectral methods for shape-from-texture." Thesis, University of York, 2000. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.325653.

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2

Chowdhury, Subir. "Development of a spectral unmixing procedure using a genetic algorithm and spectral shape." Thesis, Lethbridge, Alta. : University of Lethbridge, Dept. of Geography, c2012, 2012. http://hdl.handle.net/10133/3345.

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Spectral unmixing produces spatial abundance maps of endmembers or ‘pure’ materials using sub-pixel scale decomposition. It is particularly well suited to extracting a greater portion of the rich information content in hyperspectral data in support of real-world issues such as mineral exploration, resource management, agriculture and food security, pollution detection, and climate change. However, illumination or shading effects, signature variability, and the noise are problematic. The Least Square (LS) based spectral unmixing technique such as Non-Negative Sum Less or Equal to One (NNSLO) de

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3

He, Shuiqing, and 何水清. "Spectral analysis of medial axis for shape description." Thesis, The University of Hong Kong (Pokfulam, Hong Kong), 2015. http://hdl.handle.net/10722/212606.

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In this thesis, we make several significant achievements towards defining a medial axis based shape descriptor which is compact, yet discriminative. First, we propose a novel medial axis spectral shape descriptor called the medial axis spectrum for a 2D shape, which applies spectral analysis directly to the medial axis of a 2D shape. We extend the Laplace-Beltrami operator onto the medial axis of a 2D shape, and take the solution to an extended Laplacian eigenvalue problem defined on this axis as the medial axis spectrum. The medial axis spectrum of a 2D shape is certainly more efficient to

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4

Limberger, Frederico Artur. "Spectral signatures for non-rigid 3D shape retrieval." Thesis, University of York, 2017. http://etheses.whiterose.ac.uk/18036/.

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This thesis addresses problems associated with computing spectral shape signatures for non-rigid 3D object retrieval. More specifically, we use spectral shape analysis tools to describe the characteristics of different 3D object representations. This thesis tries to answer whether spectral shape analysis tools can enhance classical shape signatures to improve the performance of the non-rigid shape retrieval problem. Furthermore, it describes the stages of the framework for composing non-rigid shape signatures, built from the shape Laplacian. This thesis presents four methods to improve each pa

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5

De, Youngster Dela. "An Isometry-Invariant Spectral Approach for Macro-Molecular Docking." Thèse, Université d'Ottawa / University of Ottawa, 2013. http://hdl.handle.net/10393/30226.

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Proteins and the formation of large protein complexes are essential parts of living organisms. Proteins are present in all aspects of life processes, performing a multitude of various functions ranging from being structural components of cells, to facilitating the passage of certain molecules between various regions of cells. The 'protein docking problem' refers to the computational method of predicting the appropriate matching pair of a protein (receptor) with respect to another protein (ligand), when attempting to bind to one another to form a stable complex. Research shows that matching th

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6

Hanson, C. G. "The spectral shape and variability of active galactic nuclei." Thesis, University of Southampton, 1986. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.374747.

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7

Magnet, Robin. "Robust spectral methods for shape analysis and deformation assessment." Electronic Thesis or Diss., Institut polytechnique de Paris, 2024. http://www.theses.fr/2024IPPAX043.

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Le traitement et l’analyse automatiques des formes 3D est un domaine actif de la recherche moderne, avec des retombées dans de nombreux domaines.L'un des principaux défis de ce domaine réside dans la comparaison efficace des formes, par exemple pour détecter des anomalies dans les scanners d'organes, ce qui nécessite souvent d'établir des correspondances entre les surfaces.En particulier, le cadre des cartes fonctionnelles, basé sur l'analyse spectrale des formes, offre une approche flexible pour représenter et calculer ces correspondances, servant de base pour les analyses ultérieures.Cette t

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8

Seddon, Matthew. "The application of spectral geometry to 3D molecular shape comparison." Thesis, University of Sheffield, 2017. http://etheses.whiterose.ac.uk/20238/.

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9

Yu, Wang S. M. Massachusetts Institute of Technology. "Steklov geometry processing : an extrinsic approach to spectral shape analysis." Thesis, Massachusetts Institute of Technology, 2018. http://hdl.handle.net/1721.1/118033.

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Thesis: S.M., Massachusetts Institute of Technology, Department of Electrical Engineering and Computer Science, 2018.<br>Cataloged from PDF version of thesis.<br>Includes bibliographical references (pages 75-80).<br>We propose using the Dirichlet-to-Neumann operator as an extrinsic alternative to the Laplacian for spectral geometry processing and shape analysis. Intrinsic approaches, usually based on the Laplace-Beltrami operator, cannot capture the spatial embedding of a shape up to rigid motion, and many previous extrinsic methods lack theoretical justification. Instead, we consider the Stek

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10

Galasso, Fabio. "Shape-From-Texture : spectral distortion analysis and 3D reconstruction algorithms." Thesis, University of Cambridge, 2010. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.608661.

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11

Holguín-Sánchez, Fausto Daniel. "Spectral Shape Division Multiplexing (SSDM): Apparatus, Transmitter, Receiver and Detection." DigitalCommons@CalPoly, 2012. https://digitalcommons.calpoly.edu/theses/800.

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Wireless communication companies require to use the frequency spectrum to operate. Both frequency licenses and infrastructure to reuse frequencies are costly resources subject to increasing demand. This work introduces a novel multiplexing method that saves spectrum called Spectral Shape Division Multiplexing (SSDM). Under certain configurations, SSDM displays higher flexibility and throughput than other spectrally efficient methods. SSDM defines the structure of a wireless multi-carrier by software. It is similar to Orthogonal Frequency Division Multiplexing (OFDM) in that both use overlapped

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12

Velichkov, Bozhidar. "Existence and regularity results for some shape optimization problems." Thesis, Grenoble, 2013. http://www.theses.fr/2013GRENM088/document.

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Les problèmes d'optimisation de forme sont présents naturellement en physique, ingénierie, biologie, etc. Ils visent à répondre à différentes questions telles que:-A quoi une aile d'avion parfaite pourrait ressembler?-Comment faire pour réduire la résistance d'un objet en mouvement dans un gaz ou un fluide?-Comment construire une structure élastique de rigidité maximale?-Quel est le comportement d'un système de cellules en interaction?Pour des exemples précis et autres applications de l'optimisation de forme nous renvoyons à [20] et [69]. Ici, nous traitons les aspects mathématiques théoriques

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13

Brown, Lucinda Mary Joanna. "The radio to X-ray spectral shape and variability of blazars." Thesis, University of Central Lancashire, 1988. http://clok.uclan.ac.uk/20282/.

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This thesis presents the results of analysis of the spectral shape and variability properties of the radio to X-ray continua of a sample of BL Lac objects and OVV quasars ("blazars"). These results have important implications for the unification of BL Lac objects, OVV quasars and low polarisation quasars into a single class of objects showing a smoothly continuous distribution of properties. The spectral shape of the violently variable millimetre to ultraviolet emission indicates that in this wavelength region the blazar emission is dominated by a very compact, single synchrotron component whi

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14

Mate, Samuel Spicer. "Anthropometric human modeling on the shape manifold." Thesis, University of Iowa, 2016. https://ir.uiowa.edu/etd/3139.

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The accuracy of modern digital human models has led to the development of human simulation engines capable of performing a complex analysis of the biometrics and kinematics / dynamics of a digital model. While the capabilities of these simulations have seen much progress in recent years, they are hindered by a fundamental limitation regarding the diversity of the models compatible with the simulation engine, which in turn results in a reduction in the scope of the applications available to the simulation. This is typically due to the necessary implementation of a musculoskeletal structure with

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15

Prasad, Rachit. "Time Spectral Adjoint Based Design for Flutter and Limit Cycle Oscillation Suppression." Diss., Virginia Tech, 2020. http://hdl.handle.net/10919/98574.

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When designing aircraft wings shapes, it is important to ensure that the flight envelope does not overlap with regions of flutter or Limit Cycle Oscillation (LCO). A quick assessment of these dynamic aeroelastic for various design candidates is key to successful design. Flutter based design requires the sensitivity of flutter parameters to be known with the respect of design parameters. Traditionally, frequency domain based methods have been used to predict flutter characteristics and its sensitivity. However, this approach is only applicable for linear or linearized models and cannot be appli

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16

Ngo, Ngoc Hoa. "Profil spectral des raies d’absorption de la vapeur d'eau pour l'étude de l'atmosphère de la terre par télédétection." Thesis, Paris Est, 2013. http://www.theses.fr/2013PEST1134.

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Le travail présenté dans ce mémoire de thèse est consacré aux études théorique et expérimentale du profil spectral des raies d'absorption de la vapeur d'eau, une espèce clé dans l'atmosphère de la Terre. Le but de ce travail est de proposer une approche générale permettant de modéliser précisément la forme des raies d'absorption de H2O.La première partie de cette thèse porte sur la mesure des paramètres spectroscopiques de H2O pur et de H2O dans l'air dans l'infrarouge proche en utilisant un système de diode laser à cavité externe et la technique de spectroscopie d'absorption directe. Différen

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17

Velichkov, Bozhidar. "Existence and regularity results for some shape optimization problems." Doctoral thesis, Scuola Normale Superiore, 2013. http://hdl.handle.net/11384/85690.

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Les problèmes d'optimisation de forme sont présents naturellement en physique, ingénierie, biologie, etc. Ils visent à répondre à différentes questions telles que:-A quoi une aile d'avion parfaite pourrait ressembler?-Comment faire pour réduire la résistance d'un objet en mouvement dans un gaz ou un fluide?-Comment construire une structure élastique de rigidité maximale?-Quel est le comportement d'un système de cellules en interaction?Pour des exemples précis et autres applications de l'optimisation de forme nous renvoyons à [20] et [69]. Ici, nous traitons les aspects mathématiques théoriques

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18

Jennings, Amanda R. "On mechanisms for the analysis of spectral and temporal envelope shape in the human auditory system." Thesis, University of Newcastle Upon Tyne, 2005. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.413390.

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19

Rabiei, Hamed. "Spectral analysis of the cerebral cortex complexity." Thesis, Aix-Marseille, 2017. http://www.theses.fr/2017AIXM0289/document.

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La complexité de la forme de la surface est une caractéristique morphologique des surfaces pliées. Dans cette thèse, nous visons à développer des méthodes spectrales pour quantifier cette caractéristique du cortex cérébral humain reconstruit à partir d'images MR structurales. Tout d'abord, nous suggérons certaines propriétés qu'une mesure standard de la complexité de surface devrait posséder. Ensuite, nous proposons deux définitions claires de la complexité de la surface en fonction des propriétés de flexion de surface. Pour quantifier ces définitions, nous avons étendu la transformée de Fouri

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20

Maltas, Jeffrey A. "The spectral phasor approach as a tool for monitoring the autofluorescence of mitochondrial metabolism and its application to high pressure studies." Miami University / OhioLINK, 2014. http://rave.ohiolink.edu/etdc/view?acc_num=miami1408122306.

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21

Singh, Abhilasha. "Metrological study of the shape of beta spectra and experimental validation of theoretical models." Thesis, Strasbourg, 2020. http://www.theses.fr/2020STRAE014.

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Depuis les années 1970, la forme des spectres ß a été peu étudiée bien qu’il y a un intérêt croissant en métrologie des rayonnements ionisants, médecine nucléaire, énergie nucléaire, et physique fondamentale,... Les bases de données existantes sont incomplètes et manquent de précision. Dans cette thèse, un spectromètre ß dans une géométrie quasi- 4 π est développé sur la base de deux détecteurs en Si en sandwich avec une source radioactive. Différentes techniques de préparation de la source et leur influence sur la forme des spectres ß sont étudiées. Le dispositif est caractérisé en utilisant

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22

Ozbahceci, Oztunali Berguzar. "Effect Of Wave Grouping,spectral Shape And Exreme Waves In A Wave Train On The Stability Of Rubble Mound Breakwaters." Phd thesis, METU, 2004. http://etd.lib.metu.edu.tr/upload/12605170/index.pdf.

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There are some empirical formulas used in the design of rubble mound breakwaters to find the weight of armour layer stone. The effect of wave grouping and spectral shape could not put into these design formulas since their effects are still under question. The influences of wave groups and spectral shape on the stability of rubble mound breakwaters have been investigated by several researchers up to now. However, results were not conclusive in these researches, where different wave grouping and spectral shape parameters were used. This study aims to investigate the influences of wave groups an

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23

TURRIZIANI, SARA. "Studying the spectral shape and the X-ray/UV: variability of active galactic nuclei with data from swift and XMM archives." Doctoral thesis, Università degli Studi di Roma "Tor Vergata", 2010. http://hdl.handle.net/2108/202327.

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I Nuclei Galattici Attivi (AGN) hanno variazioni di flusso in tutte le bande dello spettro elettromagnetico. In effetti, la variabilità è stata una delle prime proprietà dei quasar ad essere riconosciuta. Sebbene la variabilità giochi un ruolo fondamentale nel dare una stima della grandezza del nucleo centrale degli AGN, la sua origine fisica rimane tuttora sconosciuta. Per spiegare le osservazioni ottiche spno stati proposti diversi meccanismi, ad esempio esplosioni di supernove, cattura di stelle, microlenti gravitazionali o instabilità del disco. La variabilità rapida nella banda X è dunque

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24

Oliveira, Alessandro Bof de. "Descritor de forma 2D baseado em redes complexas e teoria espectral de grafos." reponame:Biblioteca Digital de Teses e Dissertações da UFRGS, 2016. http://hdl.handle.net/10183/134397.

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A identificação de formas apresenta inúmeras aplicações na área de visão computacional, pois representa uma poderosa ferramenta para analisar as características de um objeto. Dentre as aplicações, podemos citar como exemplos a interação entre humanos e robôs, com a identificação de ações e comandos, e a análise de comportamento para vigilância com a biometria não invasiva. Em nosso trabalho nós desenvolvemos um novo descritor de formas 2D baseado na utilização de redes complexas e teoria espectral de grafos. O contorno da forma de um objeto é representado por uma rede complexa, onde cada ponto

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25

Potarowicz, Adrian, and Moghadam Seyed Mazdak Hosseini. "Spatial vibration measurements : operating deflection analysis on the example of a plate compactor." Thesis, Linnéuniversitetet, Institutionen för maskinteknik (MT), 2018. http://urn.kb.se/resolve?urn=urn:nbn:se:lnu:diva-78781.

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The operating motion of a ground compactor uses high power vibrations to improve mechanical properties of a compacted ground. This motion gives a good base for the vibration analysis with an aid of Signal Processing. In this thesis, the motion of a bottom plate in a compactor is of the main interest. The thesis concerns usage of two main spectral analyzing tools, Power Spectrum estimators and Power Spectral Density estimators, presenting advantages and disadvantages in the application of a vibration analysis. Moreover, an influence of two window applications, a Flattop window, and a Hanning wi

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26

Xiong, Wenhui. "SPECTRALLY SHAPED GENERALIZED MULTITONE DIRECT SEQUENCE SPREAD SPECTRUM." Ohio University / OhioLINK, 2007. http://rave.ohiolink.edu/etdc/view?acc_num=ohiou1178116910.

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27

Derkach, Dmytro. "Spectrum analysis methods for 3D facial expression recognition and head pose estimation." Doctoral thesis, Universitat Pompeu Fabra, 2018. http://hdl.handle.net/10803/664578.

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Al llarg de les últimes dècades, l'anàlisi facial ha atret un interès creixent i considerable per part de la comunitat investigadora amb l’objectiu de millorar la interacció i la cooperació entre les persones i les màquines. Aquest interès ha propiciat la creació de sistemes automàtics capaços de reaccionar a diversos estímuls com ara els moviments del cap o les emocions d’una persona. Més enllà, les tasques automatitzades s’han de poder realitzar amb gran precisió dins d’entorns no controlats, fet que ressalta la necessitat d'algoritmes que aprofitin al màxim els avantatges que proporcionen l

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28

Humari, Juan Herbert Chuctaya. "Estudo do espectro Laplaciano na categorização de imagens." Universidade de São Paulo, 2016. http://www.teses.usp.br/teses/disponiveis/59/59135/tde-04072016-091446/.

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Uma imagem engloba informação que precisa ser organizada para interpretar e compreender seu conteúdo. Existem diversas técnicas computacionais para extrair a principal informação de uma imagem e podem ser divididas em três áreas: análise de cor, textura e forma. Uma das principais delas é a análise de forma, por descrever características de objetos baseadas em seus pontos fronteira. Propomos um método de caracterização de imagens, por meio da análise de forma, baseada nas propriedades espectrais do laplaciano em grafos. O procedimento construiu grafos G baseados nos pontos fronteira do objeto,

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29

Michetti, Marco. "Steklov and Neumann eigenvalues : inequalities, asymptotic and mixed problems." Electronic Thesis or Diss., Université de Lorraine, 2022. http://www.theses.fr/2022LORR0109.

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Cette thèse est consacrée à l'étude des valeurs propres de Neumann, des valeurs propres de Steklov et des relations entre elles. La motivation initiale de cette thèse était de prouver que, dans le plan, le produit entre le périmètre et la première valeur propre de Steklov est toujours inférieur au produit entre l'aire et la première valeur propre de Neumann. Motivés par la recherche de contre-exemples à cette inégalité, nous donnons, dans la première partie de cette thèse, une description complète du comportement asymptotique des valeurs propres de Steklov dans un domaine en haltère constitué

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30

Berger, Amandine. "Optimisation du spectre du Laplacien avec conditions de Dirichlet et Neumann dans R² et R³." Thesis, Université Grenoble Alpes (ComUE), 2015. http://www.theses.fr/2015GREAM036/document.

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Le problème de l'optimisation des valeurs propres du Laplacien est ancien puisqu'à la fin du XIXème siècle Lord Rayleigh conjecturait que la première valeur propre avec condition de Dirichlet était minimisée par le disque. Depuis le problème a été beaucoup étudié. Et les possibilités de recherches sont multiples : diverses conditions, ajout de contraintes, existence, description des optima ... Dans ce document on se limite aux conditions de Dirichlet et de Neumann, dans R^2 et dans R^3. On procède dans un premier temps à un état de l'art. On se focalise ensuite sur les disques et les boules. E

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31

Evens, Anne F. "Spectral reflectance of vitrinite." Thesis, University of Newcastle Upon Tyne, 2000. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.311095.

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32

Havlíková, Ivana. "Dynamická analýza konstrukce zatížené seismickým zatížením." Master's thesis, Vysoké učení technické v Brně. Fakulta stavební, 2012. http://www.nusl.cz/ntk/nusl-225730.

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The purpose of my master’s thesis is the solution steel hall with concrete columns, that is loaded by an earthquake. This simulation program was used RFEM. To calculate was used the spectral and temporal analysis, and that on models of structures with several combinations of materials. The analysis was performed for both the general direction of the earthquake, so for combinations of directions according to standard procedures in EC8.

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33

Trey, Baptiste. "Existence et régularité des formes optimales pour des problèmes d'optimisation spectrale Free boundary regularity for a multiphase shape optimization problem. Communications in Partial Dfferential Equations Regularity of optimal sets for some functional involving eigenvalues of an operator in divergence form Existence and regularity of optimal shapes for elliptic operators with drift. Calculus of Variations and Partial Differential Equations." Thesis, Université Grenoble Alpes, 2020. http://www.theses.fr/2020GRALM019.

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Dans cette thèse, on étudie l'existence et la régularité des formes optimales pour certains problèmes d'optimisation spectrale qui font intervenir un opérateur elliptique avec condition de Dirichlet.On s'intéresse d'abord au problème de la minimisation de la valeur propre principale d'un opérateur avec un terme de transport borné.Que le terme de transport soit fixé ou non, ce problème admet une solution parmi les quasi-ouverts, et si le terme de transport est en outre le gradient d'une fonction Lipschitzienne, alors les solutions sont des ouverts localement de classe C^{1,alpha} en dehors de p

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34

Shao, Yuan. "Higher order spectra invariants for shape pattern recognition." Ohio : Ohio University, 2000. http://www.ohiolink.edu/etd/view.cgi?ohiou1179949998.

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35

Vazquez, Thais Godoy. "Funções de interpolação e regras de integração tensorizaveis para o metodo de elementos finitos de alta ordem." [s.n.], 2008. http://repositorio.unicamp.br/jspui/handle/REPOSIP/263500.

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Orientador: Marco Lucio Bittencourt<br>Tese (doutorado) - Universidade Estadual de Campinas, Faculdade de Engenharia Mecanica<br>Made available in DSpace on 2018-08-10T12:57:32Z (GMT). No. of bitstreams: 1 Vazquez_ThaisGodoy_D.pdf: 11719751 bytes, checksum: c6d385d6a6414705c9f468358b8d3bea (MD5) Previous issue date: 2008<br>Resumo: Este trabalho tem por objetivo principal o desenvolvimento de funções de interpolaçao e regras de integraçao tensorizaveis para o Metodo dos Elementos Finitos (MEF) de alta ordem hp, considerando os sistemas de referencias locais dos elementos. Para isso, primeira

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36

Howe, Jonathan. "Laser-plasma coupling effects on spectral line shapes." Thesis, University of York, 2007. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.490303.

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This thesis presents an experimental and computational study of strong electric field effects on plasma spectral line shapes. The role of laser-driven electron plasma waves is studied for helium-like systems where atomic energy levels are weakly susceptible to external electric fields. In this case strong electric fields associated with laser driven electron plasma waves are resonant with the radiators producing modulations on line emission. In an experiment the ASTRA laser system was used to generate expanding plasma ionised to H-like and He-like states using short (picosecond) laser pulses.

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37

Sirugue, Léa. "Conception et développement d’une méthode de comparaison de surfaces appliquée aux protéines." Thesis, Paris, HESAM, 2020. http://www.theses.fr/2020HESAC042.

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Les interactions entre protéines jouent un rôle crucial dans les processus du vivant comme la communication cellulaire, l’immunité, la croissance, prolifération et la mort cellulaires. Ces interactions se font via leur surface et la perturbation des interactions entre protéines est à la base de nombreux processus pathologiques. Il est donc nécessaire de bien comprendre et caractériser la surface des protéines et leurs interactions mutuelles de manière à mieux comprendre les processus du vivant. Différentes méthodes de comparaison de la surface des protéines ont été développées ces dernières an

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38

Curado, Manuel. "Structural Similarity: Applications to Object Recognition and Clustering." Doctoral thesis, Universidad de Alicante, 2018. http://hdl.handle.net/10045/98110.

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In this thesis, we propose many developments in the context of Structural Similarity. We address both node (local) similarity and graph (global) similarity. Concerning node similarity, we focus on improving the diffusive process leading to compute this similarity (e.g. Commute Times) by means of modifying or rewiring the structure of the graph (Graph Densification), although some advances in Laplacian-based ranking are also included in this document. Graph Densification is a particular case of what we call graph rewiring, i.e. a novel field (similar to image processing) where input graphs are

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39

Kowalczyk, Kyle. "Shape Detection Of Concealed Conductive Objects Using Microwave Ultra-Wideband Spectra." ScholarWorks @ UVM, 2020. https://scholarworks.uvm.edu/graddis/1172.

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Metal detection systems currently available to the general public ordinarily verify the presence of conductive material, not the shape. Shape detection is important for discrimination between dangerous and benign items. Test setups are developed useful for identifying the value of microwaves for shape detection behind selected material types. The behavior of this electromagnetic energy in homogeneous, isotropic, locally linear, temporally dispersive material is examined in the time and frequency domains. The results of the evaluations determine the behavior of continuous-wave microwave radiati

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40

Leandro, Jorge de Jesus Gomes. "Análise de formas usando wavelets em grafos." Universidade de São Paulo, 2014. http://www.teses.usp.br/teses/disponiveis/45/45134/tde-02072014-150049/.

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O presente texto descreve a tese de doutorado intitulada Análise de Formas usando Wavelets em Grafos. O tema está relacionado à área de Visão Computacional, particularmente aos tópicos de Caracterização, Descrição e Classificação de Formas. Dentre os métodos da extensa literatura em Análise de Formas 2D, percebe-se uma presença menor daqueles baseados em grafos com topologia arbitrária e irregular. As contribuições desta tese procuram preencher esta lacuna. É proposta uma metodologia baseada no seguinte pipeline : (i) Amostragem da forma, (ii) Estruturação das amostras em grafos, (iii) Função-

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George, Geordie. "Device-to-device communication and wearable networks harnessing spatial proximity." Doctoral thesis, Universitat Pompeu Fabra, 2017. http://hdl.handle.net/10803/404986.

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Spatially proximal devices wanting to exchange information are expected to become more prevalent in wireless networks, rendering the option for direct device-to-device (D2D) communication increasingly important. On the one hand, within networks where communication via infrastructure has been the convention, enabling such an option for short-range and single-hop communication between co-located devices might potentially bring about performance benefits on several accounts. On the other hand, in the realm of networks where direct interaction between devices has been an obvious option, there is a

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Nga, Chee Wei. "New pulse shapes for enhanced spectral efficiency in digital radio communications." Thesis, Monterey, Calif. : Naval Postgraduate School, 2007. http://bosun.nps.edu/uhtbin/hyperion-image.exe/07Sep%5FNga.pdf.

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Thesis (M.S. in Electrical Engineering)--Naval Postgraduate School, September 2007.<br>Thesis Advisor(s): Kragh, Frank. "September 2007." Description based on title screen as viewed on October 25, 2007. Includes bibliographical references (p. 67). Also available in print.

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Faid, Karim. "Stochastic theory of relaxation and collisional broadening of spectral line shapes." Diss., Georgia Institute of Technology, 1986. http://hdl.handle.net/1853/13512.

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A complete stochastic theory of relaxation is developed in terms of a homogeneous equation for the averaged density matrix of a system immersed in a thermal bath. This theory is then used as the basis of a new stochastic approach to the phenomenon of collisional broadening of spectral line shapes. Single photon and multiphoton processes are studied. The features of a line shape are linked by simple expressions to the statistical properties of a stochastic hermitian Hamiltonian. The ordinary line shape predicted by Kubo's approach is generalized. The present approach predicts broadening as well

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Chan, Jasmine H. (Jasmine Hei). "Effect of potential shape and excitation spectrum on power harvested from ambient vibration." Thesis, Massachusetts Institute of Technology, 2015. http://hdl.handle.net/1721.1/98958.

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Thesis: S.B., Massachusetts Institute of Technology, Department of Mechanical Engineering, June 2015.<br>Cataloged from PDF version of thesis. "February 2015."<br>Includes bibliographical references (pages 24-25).<br>In recent years, there have been experimental developments in energy harvesting from ambient vibrations in small-scale sensing. The ultimate goal is to replace batteries in these sensors. Linear systems have a narrow bandwidth, but ambient vibrations occur over a potentially broad range of frequencies. Nonlinear systems-in particular, bistable systems have a wide bandwidth. The ob

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Hill, Terrance J. "AN ENHANCED, CONSTANT ENVELOPE, INTEROPERABLE SHAPED OFFSET QPSK (SOQPSK) WAVEFORM FOR IMPROVED SPECTRAL EFFICIENCY." International Foundation for Telemetering, 2000. http://hdl.handle.net/10150/606498.

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International Telemetering Conference Proceedings / October 23-26, 2000 / Town & Country Hotel and Conference Center, San Diego, California<br>Shaped BPSK (SBPSK) and Shaped Offset QPSK (SOQPSK), as defined in various MIL standards, are widely employed on SATCOM links because they offer an attractive combination of good spectral efficiency, constant envelope characteristics, and interoperability with legacy equipments. More recently, numerous terrestrial applications of OQPSK and similar waveforms (Feher-patented FQPSK) have been proposed. The present paper describes a simple non-proprieta

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Broce, Jesse S. "Taphonomic Characteristics of Fossils on the Burgess-shale-type Spectrum." Thesis, University of Missouri - Columbia, 2019. http://pqdtopen.proquest.com/#viewpdf?dispub=13877133.

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Montesano, Francesco. "The full shape of the large-scale galaxy power spectrum: modelling and cosmological implications." Diss., lmu, 2011. http://nbn-resolving.de/urn:nbn:de:bvb:19-136639.

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Uusitalo, P. (Pauliina). "The bound states in the quantum waveguides of shape Y, Z, and C." Doctoral thesis, Oulun yliopisto, 2017. http://urn.fi/urn:isbn:9789526217017.

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Abstract In this thesis, we study quantum waveguides and their spectral properties. A quantum waveguide is a system of narrow strips or tubes. That is, the waveguide has large longitudinal but small transverse sizes. The study of quantum waveguides is essential in the semi-conductor industry, and the waveguides are used to model the electron behavior in these devices. We consider two- and three-dimensional waveguides with sharp bends and question whether the quantum particle can propagate in the waveguide. It is well known that a certain type of bends and bulges cause the resonance phenomena,

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Huart, Victor. "Développement d'une procédure d'estimation du dommage par fatigue des emballages de transport à partir des données spectrales." Thesis, Reims, 2016. http://www.theses.fr/2016REIMS020.

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Cette thèse traite de l’étude des contraintes induites par le transport de marchandises. Les systèmes d’emballage reposent sur une multitude de fonctionnalités : transporter, protéger, informer,etc… Leur dimensionnement est un paramètre important quant à la protection d’un produit. Lors des transports, les marchandises sont soumises à un important panel de contraintes physiques. Ces contraintes vont engendrer des dégâts et de l’usure. Cette usure peut être étudiée en décomposant les signaux accélérométriques en cycles de contraintes afin d’observer leur l'influence. Ce travail de thèse vise, d

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Ellis, Roger L. "Ballistic Impact Resistance of Graphite Epoxy Composites With Shape Memory Alloy and Extended Chain Polyethylene Spectra Hybrid Components." Thesis, Virginia Tech, 1996. http://hdl.handle.net/10919/36564.

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Graphite epoxy composites lack effective mechanisms for absorbing local impact energy often resulting in penetration and a structural strength reduction. The effect of adding small amounts of two types of high strain hybrid components on the impact resis tance of graphite epoxy composites subjected to projectiles traveling at ballistic velocities (greater than 900 ft/sec) has been studied. The hybrid components tested include superelastic shape memory alloy (SMA), a material having an unusually high stra in to failure (15 - 20%), and a high performance extended chain polyethylene (EC

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