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Dissertations / Theses on the topic 'Integral transforms'

Author: Grafiati

Published: 4 June 2021

Last updated: 25 July 2025

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1

Li, Xiaochun. "Uniform bounds for the bilinear Hilbert transforms /." free to MU campus, to others for purchase, 2001. http://wwwlib.umi.com/cr/mo/fullcit?p3025634.

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2

Khan, Mumtaz Ahmad. "On fractional integral operators of three variables and integral transforms." Pontificia Universidad Católica del Perú, 2012. http://repositorio.pucp.edu.pe/index/handle/123456789/96049.

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The present paper is a continuation to authors paper [11]where three variable analogues of certain fractional integraloperators of M. Saigo were investigated. This paper dealswith the effect of operating three variable analogues of Mellinand Laplace transforms on these three variable analogues offractional integral operators of the earlier paper.

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3

Khan, Mumtaz Ahmad, and Abukhammash Ghazi Salama. "On certain fractional integral operators of two variables and integral transforms." Pontificia Universidad Católica del Perú, 2014. http://repositorio.pucp.edu.pe/index/handle/123456789/97226.

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The present paper is in continuation to authors earlier paper {9} where two variable analogues of certain fractional integral operators of M. Saigo were investigated. This paper deals with the effect of operating two variable analogues of Mellin and Laplace transforms on these two variable analogues of fractional integral operators of the earlier paper.

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4

Alkauskas, Giedrius. "Integral transforms of the Minkowski question mark function." Thesis, University of Nottingham, 2008. http://eprints.nottingham.ac.uk/10641/.

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The Minkowski question mark function F(x) arises as a real distribution function of rationals in the Farey (alias, Stern-Brocot or Calkin-Wilf) tree. In this thesis we introduce its three natural integral transforms: the dyadic period function G(z), defined in the cut plane; the dyadic zeta function zeta_M(s), which is an entire function; the characteristic function m(t), which is an entire function as well. Each of them is a unique object, and is characterized by regularity properties and a functional equation, which reformulates in its own terms the functional equation for F(x). We study the

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5

Kerr, Fiona Helen. "Fractional powers of integral transforms for classical and generalized functions." Thesis, University of Strathclyde, 1988. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.303285.

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6

Ramaseshan, Karthik. "Microlocal analysis of the doppler transform on R³ /." Thesis, Connect to this title online; UW restricted, 2003. http://hdl.handle.net/1773/5739.

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7

Sanja, Kostadinova. "Some classes of integral transforms on distribution spaces and generalized asymptotics." Phd thesis, Univerzitet u Novom Sadu, Prirodno-matematički fakultet u Novom Sadu, 2014. https://www.cris.uns.ac.rs/record.jsf?recordId=87772&source=NDLTD&language=en.

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In this doctoral dissertation several integral transforms are discussed.The first one is the Short time Fourier transform (STFT). We present continuity theorems for the STFT and its adjoint on the test function space <em>K</em><sub>1</sub>(ℝ<sup>n</sup>) and the topological tensor product <em>K</em><sub>1</sub>(ℝ<sup>n</sup>) &otimes; <em>U</em>(<strong>ℂ</strong><sup>n</sup>), where <em>U</em>(<strong>ℂ</strong><sup>n</sup>) is the space of entirerapidly decreasing functions in any horizontal band of <strong>ℂ</strong><sup>n</sup>. We then use such continuity results to develop a framewo

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8

Dušanka, Perišić. "On Integral Transforms and Convolution Equations on the Spaces of Tempered Ultradistributions." Phd thesis, Univerzitet u Novom Sadu, Prirodno-matematički fakultet u Novom Sadu, 1992. https://www.cris.uns.ac.rs/record.jsf?recordId=73337&source=NDLTD&language=en.

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In the thesis are introduced and investigated spaces of Burling and of Roumieu type tempered ultradistributions, which are natural generalization of the space of Schwartz’s tempered distributions in Denjoy-Carleman-Komatsu’s theory of ultradistributions.  It has been proved that the introduced spaces preserve all of the good properties Schwartz space has, among others, a remarkable one, that the Fourier transform maps continuposly the spaces into themselves.In the first chapter the necessary notation and notions are given.In the second chapter, the spaces of ultrarapidly decre

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9

Ngounda, Edgard. "Efficient numerical methods based on integral transforms to solve option pricing problems." Thesis, University of the Western Cape, 2012. http://hdl.handle.net/11394/4223.

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Philosophiae Doctor - PhD<br>In this thesis, we design and implement a class of numerical methods (based on integral transforms) to solve PDEs for pricing a variety of financial derivatives. Our approach is based on spectral discretization of the spatial (asset) derivatives and the use of inverse Laplace transforms to solve the resulting problem in time. The conventional spectral methods are further modified by using piecewise high order rational interpolants on the Chebyshev mesh within each sub-domain with the boundary domain placed at the strike price where the discontinuity is located. The

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10

Pirbudak, Ozan. "Reconstruction of Radar Images by Using Spherical Mean and Regular Radon Transforms." Scholar Commons, 2019. https://scholarcommons.usf.edu/etd/7889.

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The goal of this study is the recovery of functions and finite parametric distributions from their spherical means over spheres and designing a general formula or algorithm for the reconstruction of a function f via its spherical mean transform. The theoretical study is and supported with a numerical implementation based on radar data. In this study, we approach the reconstruction problem in two different way. The first one is to show how the reconstruction problem could be converted to a Prony-type system of equations. After solving this Prony-type system of equations, one can extract the par

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11

Ambartsoumian, Gaik. "Spherical radon transforms and mathematical problems of thermoacoustic tomography." [College Station, Tex. : Texas A&M University, 2006. http://hdl.handle.net/1969.1/ETD-TAMU-1807.

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12

Vasilieva, Olesya. "A new method of pricing multi-options using Mellin transforms and Integral equations." Thesis, Halmstad University, Applied Mathematics and Physics (CAMP), 2009. http://urn.kb.se/resolve?urn=urn:nbn:se:hh:diva-3075.

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<p>In this thesis a new method for the option pricing will be introduced with</p><p>the help of the Mellin transforms. Firstly, the Mellin transform techniques for</p><p>options on a single underlying stock is presented. After that basket options</p><p>will be considered. Finally, an improvement of existing numerical results</p><p>applied to Mellin transforms for 1-basket and 2-basket American Put Option</p><p>will be discussed concisely. Our approach does not require either variable</p><p>transformations or solving diusion equations.</p>

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13

Roper, Ryan Todd. "A Study of Radiofrequency Cardiac Ablation Using Analytical and Numerical Techniques." Diss., CLICK HERE for online access, 2003. http://contentdm.lib.byu.edu/ETD/image/etd262.pdf.

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14

Pipkins, Daniel Scott. "Non-linear analysis of (i) wave propagation using transform methods and (ii) plates and shells using integral equations." Diss., Georgia Institute of Technology, 1992. http://hdl.handle.net/1853/20052.

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15

Fink, Thomas [Verfasser], Brigitte [Akademischer Betreuer] Forster-Heinlein, Uwe [Akademischer Betreuer] Kähler, and Daniel [Akademischer Betreuer] Potts. "Curvature Detection by Integral Transforms / Thomas Fink ; Brigitte Forster-Heinlein, Uwe Kähler, Daniel Potts." Passau : Universität Passau, 2020. http://d-nb.info/1203371632/34.

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16

Xu, Rui Hui. "Windowed linear canonical transform and its applications." Thesis, University of Macau, 2011. http://umaclib3.umac.mo/record=b2493220.

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17

Skokan, Michal. "Regularity of ghosts of geodesic X-ray transform /." Thesis, Connect to this title online; UW restricted, 2004. http://hdl.handle.net/1773/5744.

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18

Krishnan, Venkateswaran P. "A support theorem and an inversion formula for the geodesic ray transform /." Thesis, Connect to this title online; UW restricted, 2007. http://hdl.handle.net/1773/5804.

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19

R?go, Maria das Gra?as Oliveira. "An?lise da magnetohidrodin?mica com transfer?ncia de calor em canais de placas paralelas via transforma??o integral." Universidade Federal do Rio Grande do Norte, 2010. http://repositorio.ufrn.br:8080/jspui/handle/123456789/15631.

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Made available in DSpace on 2014-12-17T14:58:04Z (GMT). No. of bitstreams: 1 MariaGOR_DISSERT.pdf: 1839301 bytes, checksum: 7f08c7ee57fc0bc1f8282eb165223c37 (MD5) Previous issue date: 2010-11-12<br>Universidade Federal do Rio Grande do Norte<br>The main goal of the present work is related to the dynamics of the steady state, incompressible, laminar flow with heat transfer, of an electrically conducting and Newtonian fluid inside a flat parallel-plate channel under the action of an external and uniform magnetic field. For solution of the governing equations, written in the parabolic boundary

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20

Goncharov, Fedor. "Transformations de Radon pondérées et leurs applications." Thesis, Université Paris-Saclay (ComUE), 2019. http://www.theses.fr/2019SACLX029/document.

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Cette thèse est consacrée à l'étude des problèmes inverses des transformations de Radon pondérées dans les espaces euclidiens. D'une part, nos études sont motivées par l'application des transformations de Radon pondérées pour différentes tomographies, par exemple en tomographie d'émission (PET, SPECT), en tomographie de fluorescence et en tomographie optique. En particulier, nous développons une nouvelle approche de reconstruction pour les tomographies en 3D, où les données sont modélisées par des transformations des rayons pondérées le long des rayons parallèles à un plan fixe. À cet égard, n

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21

Assad, Gustavo Elia. "Análise híbrida da interação mútua escoamento/campo magnético na região de entrada de um canal de placas paralelas." Universidade Federal da Paraíba, 2016. http://tede.biblioteca.ufpb.br:8080/handle/tede/8792.

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Submitted by Cristhiane Guerra (cristhiane.guerra@gmail.com) on 2017-01-26T13:30:08Z No. of bitstreams: 1 arquivototal.pdf: 7840328 bytes, checksum: 74229a382309ea0fcf42de5818cc899a (MD5)<br>Made available in DSpace on 2017-01-26T13:30:08Z (GMT). No. of bitstreams: 1 arquivototal.pdf: 7840328 bytes, checksum: 74229a382309ea0fcf42de5818cc899a (MD5) Previous issue date: 2016-08-25<br>The aim of this work deals with the analysis of the mutual interaction between flow and magnetic fields that develops in a parallel-plate channel as soon as an external magnetic field is applied transversely to th

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22

Ячменьов, Володимир Олександрович, Владимир Александрович Ячменев, Volodymyr Oleksandrovych Yachmenov та С. А. Терновский. "Решение начально-краевых задач для уравнений с дробными производными". Thesis, Сумский государственный университет, 2014. http://essuir.sumdu.edu.ua/handle/123456789/39366.

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Исследование диффузионных процессов аномальной природы, отклоняющихся от классической гауссовской диффузии, приводит к необходимости решения начально-краевых задач для дифференциальных уравнений с дробными производными.

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23

Gomes, Francisco Augusto Aparecido [UNESP]. "Estudo analítico/numérico do problema de ablação em corpos rombudos com simetria axial." Universidade Estadual Paulista (UNESP), 2006. http://hdl.handle.net/11449/88887.

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Made available in DSpace on 2014-06-11T19:23:39Z (GMT). No. of bitstreams: 0 Previous issue date: 2006-04-24Bitstream added on 2014-06-13T19:50:37Z : No. of bitstreams: 1 gomes_faa_me_ilha.pdf: 1304340 bytes, checksum: 93a9b85b39e238ee85d2a3ae10503b07 (MD5)<br>Coordenação de Aperfeiçoamento de Pessoal de Nível Superior (CAPES)<br>O fenômeno da ablação é um processo que envolve o estudo de proteções térmicas, com muitas aplicações, principalmente na engenharia mecânica e aeroespacial. O processo envolve transferência de calor com movimento de fronteira, onde a posição é desconhecida a priori.

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24

Chunaev, Petr. "Singular integral operators and rectifiability." Doctoral thesis, Universitat Autònoma de Barcelona, 2018. http://hdl.handle.net/10803/663827.

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Los problemas que estudiamos en esta tesis se encuentran en el área de Análisis Armónico y Teoría de la Medida Geométrica. En particular, consideramos la conexión entre las propiedades analíticas de operadores integrales singulares definidos en $L^2(\mu)$ y asociados con algunos núcleos de Calderón-Zygmund y las propiedades geométricas de la medida $\mu$. Seamos más precisos. Sea $E$ un conjunto de Borel en el plano complejo con la medida lineal de Hausdorff $H^1$ finita y distinta de cero, es decir, $0<H^1(E)<\infty $. G. David y J.C. Léger (1999) probaron que el núcleo de Cauchy $1/z$ (e su

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25

Souza, Luís Henrique Gazeta de [UNESP]. "Aplicação da transformada integral generalizada no escoamento potencial em contrações." Universidade Estadual Paulista (UNESP), 2009. http://hdl.handle.net/11449/88871.

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Made available in DSpace on 2014-06-11T19:23:39Z (GMT). No. of bitstreams: 0 Previous issue date: 2009-07-30Bitstream added on 2014-06-13T20:50:44Z : No. of bitstreams: 1 souza_lhg_me_ilha.pdf: 1993240 bytes, checksum: b09e517d41877144e2a7b2634fd5fd55 (MD5)<br>Realiza-se a formulação matemática do escoamento potencial no interior de contrações bidimensionais usando sistemas de coordenadas cartesianas e cilíndricas. Para tal considera-se que as geometrias das contrações sejam bidimensionais no sistema de coordenadas cartesianas e bidimensionais com simetria axial no sistema de coordenadas cil

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26

Liu, Haohao. "Integral points, monodromy, generic vanishing and Fourier-Mukai transform." Electronic Thesis or Diss., Sorbonne université, 2024. http://www.theses.fr/2024SORUS112.

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Cette thèse est une compilation de plusieurs résultats vaguement liés. Ils concernent la non-densité des points entiers sur les variétés algébriques, la méthode de Lawrence-Venkatesh-Sawin et la géométrie analytique complexe. Dans Chapitre 2, parallèlement au principe alternatif d'Ullmo et Yafaev sur les points rationnels des variétés de Shimura, nous montrons que la conjecture de Lang sur les points intégraux des variétés de Shimura est soit vraie, soit très fausse. Le Chapitre 3 est un complément à la comparaison des monodromies dans les travaux respectifs de Lawrence-Sawin et Krämer-Maculan

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27

Gomes, Francisco Augusto Aparecido. "Estudo analítico/numérico do problema de ablação em corpos rombudos com simetria axial /." Ilha Solteira : [s.n.], 2006. http://hdl.handle.net/11449/88887.

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Resumo: O fenômeno da ablação é um processo que envolve o estudo de proteções térmicas, com muitas aplicações, principalmente na engenharia mecânica e aeroespacial. O processo envolve transferência de calor com movimento de fronteira, onde a posição é desconhecida a priori. As equações governantes do processo formam um sistema não-linear de equações diferenciais acoplado. A análise unidimensional do processo ablativo é realizada em um corpo de revolução, o qual está sobre intenso aquecimento. Esse problema é resolvido utilizando a Técnica da Transformada Integral Generalizada - TTIG, para solu

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28

Souza, Luís Henrique Gazeta de. "Aplicação da transformada integral generalizada no escoamento potencial em contrações /." Ilha Solteira : [s.n.], 2009. http://hdl.handle.net/11449/88871.

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Orientador: João Batista Aparecido<br>Banca: Cassio Roberto Macedo Maia<br>Banca: Alcides Padilha<br>Resumo: Realiza-se a formulação matemática do escoamento potencial no interior de contrações bidimensionais usando sistemas de coordenadas cartesianas e cilíndricas. Para tal considera-se que as geometrias das contrações sejam bidimensionais no sistema de coordenadas cartesianas e bidimensionais com simetria axial no sistema de coordenadas cilíndricas. A formulação é adaptada a partir das equações tridimensionais de Euler em coordenadas cartesianas e cilíndricas, fazendo-se as hipóteses de bidi

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29

Rastandi, Josia Irwan. "Modelization of dynamic soil-structure interaction using integral transform-finite element coupling." [S.l. : s.n.], 2003. http://deposit.ddb.de/cgi-bin/dokserv?idn=970018614.

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30

Chibawara, Trust. "Pricing and hedging asian options using Monte Carlo and integral transform techniques." Thesis, Stellenbosch : University of Stellenbosch, 2010. http://hdl.handle.net/10019.1/4292.

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Thesis (MSc (Mathematics))--University of Stellenbosch, 2010.<br>ENGLISH ABSTRACT: In this thesis, we discuss and apply the Monte Carlo and integral transform methods in pricing options. These methods have proved to be very e ective in the valuation of options especially when acceleration techniques are introduced. By rst pricing European call options we have motivated the use of these methods in pricing arithmetic Asian options which have proved to be di cult to price and hedge under the Black􀀀Scholes framework. The arithmetic average of the prices in this framework, is a sum of correla

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31

Pavel, Dimovski. "Translation invariant Banach spaces of distributions and boundary values of integral transform." Phd thesis, Univerzitet u Novom Sadu, Prirodno-matematički fakultet u Novom Sadu, 2015. https://www.cris.uns.ac.rs/record.jsf?recordId=93767&source=NDLTD&language=en.

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We use common notation &lowast; for distribution (Scshwartz), (M<sub>p</sub>) (Beurling) i {M<sub>p</sub>} (Roumieu) setting. We introduce and study new (ultra) distribution spaces, the test function spaces <em>D<sup>&lowast;</sup><sub>E</sub></em>  and their strong duals <em>D<sup>'&lowast;</sup><sub>E’*</sub></em>.These spaces generalize the spaces <em>D<sup>&lowast;</sup><sub>L<sup>q</sup></sub> , D'<sup>&lowast;</sup><sub>L<sup>p</sup></sub> , B’*</em> and their weighted versions. The construction of our new (ultra)distribution  spaces is based on th

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32

Huang, Min. "Applications of integral transform methods to the Schroedinger equation and dynamical systems." The Ohio State University, 2010. http://rave.ohiolink.edu/etdc/view?acc_num=osu1277345391.

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33

Vitturi, Marco. "Double Hilbert transforms along surfaces in the Heisenberg group." Thesis, University of Edinburgh, 2017. http://hdl.handle.net/1842/25418.

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We provide an L² theory for the local double Hilbert transform along an analytic surface (s, t ,φ(s, t )) in the Heisenberg group H¹, that is operator f ↦ Hφ f (x) := p.v.∫∣s∣,∣t∣≤1 f (x ∙ (s, t ,φ(s, t ))-¹) ds/s dt/t, where ∙ denotes the group operation in H1. This operator combines several features: it is amulti-parameter singular integral, its kernel is supported along a submanifold, and convolution is with respect to a homogeneous group structure. We reprove Hφ is always L²(H¹)→L²(H¹) bounded (a result first obtained in [Str12]) to illustrate the method and then refine it to characterize

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34

Alves, Thiago Antonini [UNESP]. "Aplicação da transformada integral e da transformação conforme na solução de uma classe de problemas difusivo-convectivos em domínios de geometrias não-convencionais." Universidade Estadual Paulista (UNESP), 2006. http://hdl.handle.net/11449/88876.

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Made available in DSpace on 2014-06-11T19:23:39Z (GMT). No. of bitstreams: 0 Previous issue date: 2006-08-18Bitstream added on 2014-06-13T18:48:07Z : No. of bitstreams: 1 alves_ta_me_ilha.pdf: 8112255 bytes, checksum: 408af7eb63e2a3050e7bda3fd133d8cf (MD5)<br>Conselho Nacional de Desenvolvimento Científico e Tecnológico (CNPq)<br>O presente trabalho trata da solução de uma classe de problemas difusivo-convectivos, tanto de natureza elíptica como parabólica, em domínios de geometrias não-convencionais, através da aplicação da Transformada Integral. Para facilitar o tratamento analítico e a ap

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35

Bacca, Sonia. "Study of electromagnetic reactions on light nuclei with the Lorentz integral transform method." [S.l. : s.n.], 2005. http://deposit.ddb.de/cgi-bin/dokserv?idn=976128365.

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36

Szabo, Szilard. "Nahm transform for integrable connections on the Riemann sphere." Université Louis Pasteur (Strasbourg) (1971-2008), 2005. http://www.theses.fr/2005STR13072.

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37

Ballard, Grey M. "Asymptotic behavior of the eigenvalues of Toeplitz integral operators associated with the Hankel transform." Electronic thesis, 2008. http://dspace.zsr.wfu.edu/jspui/handle/10339/221.

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38

Doroshenko, V. O., N. P. Klimova, N. P. Stognii, and Yu D. Kostyn. "Mathematical Modelling of Impulse Excitation of a Superwideband PEC Cone Antenna." Thesis, 2019 IEEE 8th International Conference on Advanced Optoelectronics and Lasers, CAOL*2019, 2019. https://openarchive.nure.ua/handle/document/16284.

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The method for solving initial-boundary electromagnetic problems is proposed. It uses the Green’s function method and the Laplace and Meler-Fock integral transforms in a time domain. The model problem of special slotted cone antenna excitation is studied. Integral and series representation of electromagnetic field component are given.

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39

Grouy, Thibaut. "Radon-type transforms on some symmetric spaces." Doctoral thesis, Universite Libre de Bruxelles, 2019. http://hdl.handle.net/2013/ULB-DIPOT:oai:dipot.ulb.ac.be:2013/285815.

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Dans cette thèse, nous étudions des transformées de type Radon sur certains espaces symétriques. Une transformée de type Radon associe à toute fonction continue à support compact sur une variété $M$ ses intégrales sur une classe $Xi$ de sous-variétés de $M$. Le problème sur lequel nous nous concentrons est l'inversion d'une telle transformée, c'est-à-dire déterminer la fonction à partir de ses intégrales sur les sous-variétés dans $Xi$. Nous présentons d'abord la solution de ce problème inverse due à Sigurdur Helgason et François Rouvière, entre autres, lorsque $M$ est un espace symétrique rie

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40

Butler, Samuel Thomas James. "Inverse Scattering Transform Method for Lattice Equations." Thesis, The University of Sydney, 2012. http://hdl.handle.net/2123/8724.

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The main original contribution of this thesis is the development of a fully discrete inverse scattering transform (IST) method for nonlinear partial difference equations. The equations we solve are nonlinear partial difference equations on a quad-graph, also called lattice equations, which are known to be multidimensionally consistent in N dimensions for arbitrary N. Such equations were discovered by Nijhoff, Quispel and Capel and Adler and later classified by Adler, Bobenko and Suris. The main equation solved by our IST framework is the Q3δ lattice equation. Our approach also solves all of it

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41

Poliak, Juraj. "Vliv optických prvků na vyzařovaný laserový svazek." Master's thesis, Vysoké učení technické v Brně. Fakulta elektrotechniky a komunikačních technologií, 2011. http://www.nusl.cz/ntk/nusl-219107.

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Diplomová práca pojednáva o skalárnej teórii difrakcie a zavádza dôležité riešenie vlnovej rovnice a to elipticky symetrický Gaussov zväzok. V praktickej časti bude popísané modelovanie difrakcie na kruhovom otvore dvoma rôznymi prístupmi. Model bude experimentálne overený experimentom. V záverečnej časti bude kriticky pojednané o výsledkoch experimentu a simulácie.

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42

Aquino, Junielson Pantoja de. "Alguns resultados sobre a teoria de restrição da transformada de Fourier." reponame:Biblioteca Digital de Teses e Dissertações da UFRGS, 2016. http://hdl.handle.net/10183/159583.

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A análise harmônica e o ramo da matemática que estuda a representação de funções ou sinais como a sobreposição de ondas base. Ela investiga e generaliza as noções das séries de Fourier e da transformação de Fourier. Neste trabalho, investigou-se um teorema de restrição da transformada de Fourier devido a Mitsis e Mockenhaupt (uma generalização do teorema de Stein-Tomas). Foram realizados estudos analíticos sobre o método para operadores integrais oscilatórios, baseado na fase estacionária. Os resultados permitem deduzir o teorema de restrição no plano (em seu caso geral) e o teorema de Carleso

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Bishop, Shannon Renee Smith. "Gabor and wavelet analysis with applications to Schatten class integral operators." Diss., Georgia Institute of Technology, 2010. http://hdl.handle.net/1853/33976.

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This thesis addresses four topics in the area of applied harmonic analysis. First, we show that the affine densities of separable wavelet frames affect the frame properties. In particular, we describe a new relationship between the affine densities, frame bounds and weighted admissibility constants of the mother wavelets of pairs of separable wavelet frames. This result is also extended to wavelet frame sequences. Second, we consider affine pseudodifferential operators, generalizations of pseudodifferential operators that model wideband wireless communication channels. We find two classes

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Gismalla, Yousif Ebtihal. "Performance analysis of spectrum sensing techniques for cognitive radio systems." Thesis, University of Manchester, 2013. https://www.research.manchester.ac.uk/portal/en/theses/performance-analysis-of-spectrum-sensing-techniques-for-cognitive-radio-systems(157fe1af-717c-4705-a649-d809766cf5cb).html.

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Cognitive radio is a technology that aims to maximize the current usage of the licensed frequency spectrum. Cognitive radio aims to provide services for license-exempt users by making use of dynamic spectrum access (DSA) and opportunistic spectrum sharing strategies (OSS). Cognitive radios are defined as intelligent wireless devices capable of adapting their communication parameters in order to operate within underutilized bands while avoiding causing interference to licensed users. An underused band of frequencies in a specific location or time is known as a spectrum hole. Therefore, in order

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Moghaddam, Peyman P., and Felix J. Herrmann. "Migration preconditioning with curvelets." Society of Exploration Geophysicists, 2004. http://hdl.handle.net/2429/425.

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In this paper, the property of Curvelet transforms for preconditioning the migration and normal operators is investigated. These operators belong to the class of Fourier integral operators and pseudo-differential operators, respectively. The effect of this preconditioner is shown in term of improvement of sparsity, convergence rate, number of iteration for the Krylov-subspace solver and clustering of singular(eigen) values. The migration operator, which we employed in this work is the common-offset Kirchoff-Born migration.

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Almeida, Luis Miguel Lima de. "All-optical processing based on integrated optics." Master's thesis, Universidade de Aveiro, 2014. http://hdl.handle.net/10773/13705.

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Mestrado em Engenharia Eletrónica e Telecomunicações<br>During the last years, the demand for high data transfer rates in optical fiber communications has increased exponentially. Since image in its original format exactly as it is captured by the digital camera requires an enormous amount of storage capacity, it is important to develop a system that increases its amount of compression while preserving the important image’s information. In the topic of image’s compression, there are several transformation techniques used for data compression. Discrete Wavelet Transform (DWT) is one of t

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Camargo, Rubens de Figueiredo. "Calculo fracionario e aplicações." [s.n.], 2009. http://repositorio.unicamp.br/jspui/handle/REPOSIP/307012.

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Orientadores: Edmundo Capelas de Oliveira, Ary Orozimbo Chiacchio<br>Tese (doutorado) - Universidade Estadual de Campinas, Instituto de Matematica, Estatistica e Computação Cientifica<br>Made available in DSpace on 2018-08-12T21:42:46Z (GMT). No. of bitstreams: 1 Camargo_RubensdeFigueiredo_D.pdf: 9956358 bytes, checksum: 45d7b7d76ae44d9b713d341ffc7a1ad5 (MD5) Previous issue date: 2009<br>Resumo: Apresentamos neste trabalho um estudo sistemático e detalhado sobre integrais e derivadas de ordens arbitrárias, o assim chamado cálculo de ordem não-inteira, popularizado com o nome de Cálculo Fraci

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Li, Wei. "Thermal Barrier Effect, Non-Fourier Effect and Inertia Effect on a Cracked Plate under Thermal Shock Loading." Thesis, Sorbonne Paris Cité, 2016. http://www.theses.fr/2016USPCD089/document.

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Les chocs thermiques provoquent, en général, l’endommagement et la fissuration des matériaux. Ces phénomènes sont observés, par exemple, dans le revêtement de barrière thermique pour les moteurs des turbines, le traitement des surfaces ou la soudure par laser etc. Plusieurs travaux de recherche ont été réalisés au cours des dernières décennies dans l’objectif d’améliorer les performances thermiques et/ou mécaniques des matériaux sous chargement thermique. L’étude des dommages et de la fissuration des matériaux provoqués par les chocs thermiques, tels que le décollement des interfaces et de déc

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Alves, Thiago Antonini. "Aplicação da transformada integral e da transformação conforme na solução de uma classe de problemas difusivo-convectivos em domínios de geometrias não-convencionais /." Ilha Solteira : [s.n.], 2006. http://hdl.handle.net/11449/88876.

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Resumo: O presente trabalho trata da solução de uma classe de problemas difusivo-convectivos, tanto de natureza elíptica como parabólica, em domínios de geometrias não-convencionais, através da aplicação da Transformada Integral. Para facilitar o tratamento analítico e a aplicação das condições de contorno, antes da aplicação da Técnica da Transformada Integral Generalizada - TTIG sobre a equação governante do problema estudado, emprega-se uma Transformação Conforme - TC visando efetuar uma mudança de coordenadas adequada. Analisa-se inicialmente o problema hidrodinâmico do escoamento laminar

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Bastos, ?sis Boll de Ara?jo. "A efetividade da previs?o constitucional de prote??o integral de crian?as e adolescentes : o uso da media??o como procedimento adequado ? transforma??o dos conflitos conjuparentais." Pontif?cia Universidade Cat?lica do Rio Grande do Sul, 2018. http://tede2.pucrs.br/tede2/handle/tede/8278.

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Submitted by PPG Direito (ppgdir@pucrs.br) on 2018-09-10T18:33:25Z No. of bitstreams: 1 ?SIS_BOLL_DE_ ARAUJO_BASTOS_TES.pdf: 2389583 bytes, checksum: 196cf75482cb924c1a1581c7e059967b (MD5)<br>Approved for entry into archive by Sheila Dias (sheila.dias@pucrs.br) on 2018-09-12T12:01:13Z (GMT) No. of bitstreams: 1 ?SIS_BOLL_DE_ ARAUJO_BASTOS_TES.pdf: 2389583 bytes, checksum: 196cf75482cb924c1a1581c7e059967b (MD5)<br>Made available in DSpace on 2018-09-12T12:07:53Z (GMT). No. of bitstreams: 1 ?SIS_BOLL_DE_ ARAUJO_BASTOS_TES.pdf: 2389583 bytes, checksum: 196cf75482cb924c1a1581c7e059967b (MD5)

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