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Dissertations / Theses on the topic 'Inverse Laplace transform'

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Published: 4 June 2021

Last updated: 25 July 2025

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1

Corcoran, Joseph Michael. "An Energy Diffusion Model for Interior Acoustics with Structural Coupling Using the Laplace Transform Boundary Element Solution." Diss., Virginia Tech, 2013. http://hdl.handle.net/10919/51793.

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Knowledge of the indoor propagation of sound has many important applications including acoustic prediction in homes, office buildings, stores, and schools, and the design of concert halls, auditoriums, classrooms, and factories. At low frequencies, interior acoustics are analyzed with the wave equation, but significant computational expense imposes an upper frequency limit. Thus, energy methods are often sought for high frequency analysis. However, conventional energy methods are significantly limited by vast simplifications or computational costs. Therefore, new improvements are still being s

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2

d\'Eurydice, Marcel Nogueira. "Desenvolvimento de metodologias para o estudo de meios porosos por ressonância magnética nuclear." Universidade de São Paulo, 2011. http://www.teses.usp.br/teses/disponiveis/76/76132/tde-30082011-084023/.

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O presente trabalho teve como objetivo a implementação de técnicas de Ressonância Magnética Nuclear (RMN) para o estudo de meios porosos em geral, com potenciais aplicações no estudo de rochas, ossos, polímeros e materiais cerâmicos porosos. Devido à heterogeneidade e à complexidade desses meios, torna-se importante correlacionar variados parâmetros físicos que contenham informações tanto sobre a dinâmica molecular quanto sobre a estrutura físico-química dos poros e dos fluidos que os permeiam. Utilizando técnicas de RMN, é possível investigar esses parâmetros através da medida dos coeficiente

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3

Costa, Sandra Cristina. "Condutividade e movimento de carga espacial em amostras desordenadas." Universidade de São Paulo, 2000. http://www.teses.usp.br/teses/disponiveis/76/76132/tde-09042008-135129/.

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Na condução por saltos dispersiva, os portadores de carga são caracterizados por tempos de residência não exponenciais. Como uma conseqüência, efeitos hereditários aparecem e o problema deve ser conduzido no espaçõ de Laplace. Distribuições dielétricas conhecidas e algumas outras foram usadas como possíveis funções capazes de descrever o meio desordenado. Um estudo cuidadoso de seus espectros de freqüência foi realizado. O método de inversão de Widder truncado foi desenvolvido para possibilitar a volta do espaço de Laplace para o do tempo real. Dois tipos de problemas práticos foram abordados:

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4

Baydoun, Ibrahim. "Transport laplacien, problème inverse et opérateurs de Dirichlet-Neumann." Thesis, Aix-Marseille 2, 2011. http://www.theses.fr/2011AIX22094.

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Le travail de ma thèse est basé sur ces 4 points :i) Transport laplacien d'une cellule absorbante :Soit un certain espèce (cellule) de concentration C(x), qui diffuse dans un milieu homogène et isotrope à partir d'une lointaine source localisée sur la frontière fermée $partial Omega_{0}$ vers une interface compact semi-perméable $partial Omega$ (membrane de la "cellule") à laquelle elle disparaisse àun taux d'absorption donné : W>=0. La concentration C (transport laplacien avec un coefficient de diffusion D) satisfaite le problème (P1) (voir la thèse). On s'intéresse à résoudre le problème

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5

Moraes, Tiago Bueno de. "Precessão Livre no Estado Estacionário com alternância de fase para RMN em alta e baixa resolução." Universidade de São Paulo, 2016. http://www.teses.usp.br/teses/disponiveis/76/76132/tde-14102016-091634/.

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A aplicação de uma sequência de pulsos com tempo de repetição muito menor que os tempos de relaxação Tp << T2; T1, faz com que a magnetização atinja um estado estacionário descrito por H.Y. Carr como Estado Estacionário em Precessão Livre, Steady State Free Precession (SSFP). Nessa condição, o sinal é composto pela complexa sobreposição das componentes FID e eco. Sequências tipo SSFP são utilizadas na aquisição rápida de sinais, resultando em uma boa razão sinal ruído (s/r) em curto intervalo de tempo, porém introduzem fortes anomalias de fase e amplitude devido a complexa interação das compon

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6

SILVA, Fernanda clara de França. "Existência de solução para algumas equações de evolução via Teoria de semigrupo analítico." Universidade Federal de Campina Grande, 2007. http://dspace.sti.ufcg.edu.br:8080/jspui/handle/riufcg/1192.

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Submitted by Johnny Rodrigues (johnnyrodrigues@ufcg.edu.br) on 2018-07-17T18:11:25Z No. of bitstreams: 1 FERNANDA CLARA DE FRANÇA SILVA - DISSERTAÇÃO PPGMAT 2007..pdf: 1721266 bytes, checksum: 8fe11d5b6d0c4698bb44035e0066f16a (MD5)<br>Made available in DSpace on 2018-07-17T18:11:25Z (GMT). No. of bitstreams: 1 FERNANDA CLARA DE FRANÇA SILVA - DISSERTAÇÃO PPGMAT 2007..pdf: 1721266 bytes, checksum: 8fe11d5b6d0c4698bb44035e0066f16a (MD5) Previous issue date: 2007-12<br>CNPq<br>Capes<br>Neste trabalho, apresentamos uma introdução à Teoria de semigrupos analíticos de operadores lineares não limi

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7

Sudler, Glenn F. "Asian Options: Inverse Laplace Transforms and Martingale Methods Revisited." Thesis, Virginia Tech, 1999. http://hdl.handle.net/10919/34300.

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Arithmetic Asian options are difficult to price and hedge, since, at the present, no closed-form analytical solution exists to price them. This difficulty, moreover, has led to the development of various methods and models used to price these instruments. The purpose of this thesis is two-fold. First, we present an overview of the literature. Secondly, we develop a pseudo-analytical method proposed by Geman and Yor and present an accurate and relatively quick algorithm which can be used to price European-style arithmetic Asian options and their hedge parameters.<br>Master of Science

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8

Cain, Jonathan Aaron. "Parallelization of the Dempster-Shafer Application to Talbot's Method for Numerical Inverse Laplace Transforms." Thesis, The University of Arizona, 2011. http://hdl.handle.net/10150/144252.

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9

Baughman, Jessi Alan. "Solid-State NMR Characterization of Polymeric and Inorganic Materials." University of Akron / OhioLINK, 2015. http://rave.ohiolink.edu/etdc/view?acc_num=akron1428198096.

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10

Uçar, Eren. "Spectral invariants for polygons and orbisurfaces." Doctoral thesis, Humboldt-Universität zu Berlin, 2017. http://dx.doi.org/10.18452/18463.

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In dieser Arbeit beschäftigen wir uns mit Spektralinvarianten von Polygonen und geschlossenen Orbiflächen konstanter Gaußkrümmung. Unsere Methode ist es jeweils den Wärmeleitungskern und die asymptotische Entwicklung der Wärmespur zu untersuchen. Als erstes untersuchen wir hyperbolische Polygone, d.h. relativ kompakte Gebiete in der hyperbolischen Ebene mit stückweise geodätischem Rand. Wir berechnen die asymptotische Entwicklung der Wärmespur bezüglich des Dirichlet-Laplace Operators eines beliebigen hyperbolischen Polygons, und wir erhalten explizite Formeln für alle Wärmeinvarianten. Analog

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11

Malezan, Alex. "Reconstrução espectral de tubos de radiação odontológicos usando a transformada inversa de Laplace da curva de atenuação." Universidade de São Paulo, 2013. http://www.teses.usp.br/teses/disponiveis/59/59135/tde-02092013-233953/.

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No estudo de imagens radiográcas, os parâmetros relacionados ao contraste objeto, SC, razão sinal ruído, SNR, e dose, estão vinculados à forma do espectro de raios X utilizado e seu conhecimento permite predizer e otimizar a qualidade da imagem. Neste trabalho foi desenvolvida uma metodologia que permite obter o espectro de tubos de raios X odontológicos de uso clínico de forma indireta. Esta metodologia é baseada na aplicação de um modelo matemático que utiliza a transformada inversa de Laplace da curva de transmissão do feixe para gerar dados sobre a distribuição espectral do mesmo. Com o a

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12

Maillet, Denis. "Apport des méthodes analytiques à l'identification de paramètres et à la conduction inverse en thermique." Vandoeuvre-les-Nancy, INPL, 1991. http://docnum.univ-lorraine.fr/public/INPL_T_1991_MAILLET_D.pdf.

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Les conditions d'identifiabilité des paramètres actifs (nombres de Biot des pertes et diffusivité thermique) de la méthode flash sont étudiées ainsi que le chiffrage des erreurs sur leurs estimations. La même méthode flash permet également d'accéder à certaines propriétés thermophysiques d'un dépôt solidaire d'un substrat connu et une nouvelle méthode d'identification, basée sur les transformées expérimentales du contraste thermique, est développée. Le contrôle non-destructif de plaques de composites stratifiés, présentant des délaminages, est ensuite abordé : la méthode thermique est basée su

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13

Litman, Amélie. "Deux methodes d'inversion pour la caracterisation electromagnetique ou acoustique d'objets enfouis : transformee de fourier-laplace inverse et deformation d'ensembles de niveaux." Paris 11, 1997. http://www.theses.fr/1997PA112254.

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Deux problemes inverses bien precis de diffraction des ondes sont abordes : la caracterisation d'inclusions dans un bloc metallique par des courants electromagnetiques basses-frequences et celle d'un diffracteur homogene en espace libre ou stratifie. Ces deux problemes sont non-lineaires et mal-poses. Le premier probleme concerne le controle non-destructif en courants de foucault. C'est dans le cadre de la tomographie par diffraction que ce probleme, ici linearise, est aborde. L'equation obtenue est une transformee de fourier-laplace, ou le parametre de laplace est couple a celui de fourier. D

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14

Al-Zubaidi, R.-Smith Nawfal. "Metody numerické inverzní Laplaceovy transformace pro elektrotechniku a jejich použití." Doctoral thesis, Vysoké učení technické v Brně. Fakulta elektrotechniky a komunikačních technologií, 2018. http://www.nusl.cz/ntk/nusl-390290.

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Numerické metody inverzní Laplaceovy transformace (NILT) se staly důležitou částí numerické sady nástrojů praktikujících a výzkumných pracovníků v mnoha vědeckých a inženýrských oborech, zejména v aplikované elektrotechnice. Techniky NILT zejména pomáhají při získávání výsledků simulací v časové oblasti v různých aplikacích. Příkladem jsou řešení obyčejných diferenciálních rovnic, které se objevují např. při analýze obvodů se soustředěnými parametry, nebo řešení parciálních diferenciálních rovnic objevujících se v systémech s rozprostřenými parametry, např. při zkoumání problematiky integrity

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15

Chien, Lien-Ting, and 簡連廷. "Inverse Laplace transform applied in two dimensional temperature field." Thesis, 2012. http://ndltd.ncl.edu.tw/handle/8dmz94.

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碩士<br>國立臺北科技大學<br>製造科技研究所<br>100<br>This thesis is mainly focusing on the two-dimensional temperature field analysis of the organic fertilizer fermented machine. The operation method of this organic fertilizer fermented machine is to drop kitchen waste, organic disposal, and composition of biological bacteria enzymes into the fermenter. Then, the heater will heat up the fermenter so that the activity of the enzyme composition of biological bacteria will rise. And it helps in eliminating harmful micro-organisms in the original kitchen waste and organic disposal. And the original kitchen waste a

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16

Fordham, Edmund J., Lalitha Venkataramanan, Jonathan Mitchell, and Andrea Valori. "What are, and what are not, Inverse Laplace Transforms." 2017. https://ul.qucosa.de/id/qucosa%3A31590.

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Time-domain NMR, in one and higher dimensionalities, makes routine use of inversion algorithms to generate results called \T2-distributions' or joint distributions in two (or higher) dimensions of other NMR parameters, T1, diffusivity D, pore size a, etc. These are frequently referred to as \Inverse Laplace Transforms' although the standard inversion of the Laplace Transform long-established in many textbooks of mathematical physics does not perform (and cannot perform) the calculation of such distributions. The operations performed in the estimation of a \T2-distribution' are the estimation o

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17

Feng, Yang Shih, and 楊士鋒. "Applications of FDCT and sequence transformation to the numerical inverse of Laplace transform." Thesis, 1993. http://ndltd.ncl.edu.tw/handle/51424056248145901055.

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碩士<br>國立成功大學<br>化學工程研究所<br>81<br>The Laplace transform is a powerful and widely used mathematical tool. It can be used to convert linear orindary differential equations to algebraic equations which are easily manipulated. The Laplace transform can also be used to analyze the dynamic behavior of chemical engineering process systems discribed by partial differential equations. In solving an engineering problem by the Laplace transform technique, one may fail to find the poles and residues for

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18

CHAO, kuo-hua, and 趙國驊. "The Combination of Symbolic Computation and Laplace Transform to Solve the Inverse Heat Conduction Problem." Thesis, 2005. http://ndltd.ncl.edu.tw/handle/73921208863617625156.

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碩士<br>國立高雄應用科技大學<br>模具工程系碩士班<br>93<br>This paper introduces a hybrid method to analyze the inverse heat-conduction problem. The Laplace transform method is applied to the specific time to get the systematic temperature profile, and does not need to calculate with the time interval one by one. On the other hand, the combination of symbolic computation can be used to represent the unknown boundaries and then executes the finite difference method to calculate the temperature field. The method can fast directly express the examine temperature or the unknown border of quantity with the linear equat

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19

Mulligan, Vikram. "Probing the Molecular Mechanisms Underlying Familial Amyotrophic Lateral Sclerosis: New Insight into Unfolding and Misfolding Mechanisms of the Cu, Zn Superoxide Dismutase." Thesis, 2012. http://hdl.handle.net/1807/34815.

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While great strides have been made in treating many classes of human disease, the late-onset neurodegenerative diseases continue to elude modern medicine. These diseases, which include Alzheimer's disease (AD), Parkinson's disease (PD), Huntington's disease (HD), the transmissible spongiform encephalopathies (TSEs), and amyotrophic lateral sclerosis (ALS), involve accumulation of insoluble aggregates of one or more causative proteins, leading to progressive loss of central nervous system neurons, progressively worsening neurological symptoms, and eventual patient death. All of these diseases

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20

Stafford, James Floyd. "An algebraic approach to computing inverse Laplace transforms of rational functions." 1989. http://hdl.handle.net/2097/22469.

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21

Schulz, Jochen. "Field reconstructions and range tests for acoustics and electromagnetics in homogeneous and layered media." Doctoral thesis, 2007. http://hdl.handle.net/11858/00-1735-0000-0006-B3A5-B.

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