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Dissertations / Theses on the topic 'Curvas de dispersión'

Author: Grafiati

Published: 26 June 2021

Last updated: 29 July 2025

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1

Vázquez, Martínez Santiago. "Nuevas técnicas de ensayos no destructivos basadas en ondas mecánicas para la valoración del daño en materiales cementicios." Doctoral thesis, Universitat Politècnica de València, 2021. http://hdl.handle.net/10251/165531.

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[ES] En la actualidad, una gran cantidad de infraestructuras están compuestas de forma parcial o total de materiales cementicios, siendo el hormigón uno de los materiales cementicios más antiguos y utilizados en la construcción debido a su bajo coste, durabilidad y características mecánicas y estructurales. Pese a sus características, estos materiales están expuestos a diversas condiciones adversas del entorno y sufren procesos de deterioro que afectan a su integridad y seguridad. El reconocimiento de la integridad y seguridad en las estructuras cementicias ha implicado una extensa investigac

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2

Gandhi, Navneet. "Determination of dispersion curves for acoustoelastic lamb wave propagation." Thesis, Georgia Institute of Technology, 2010. http://hdl.handle.net/1853/37158.

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The effect of stress on Lamb wave propagation is relevant to both nondestructive evaluation and structural health monitoring because of changes in received signals due to both the associated strain and the acoustoelastic effect. A homogeneous plate that is initially isotropic becomes anisotropic under biaxial stress, and dispersion of propagating waves becomes directionally dependent. The problem is similar to Lamb wave propagation in an anisotropic plate, except the fourth order tensor in the resulting wave equation does not have the same symmetry as that for the unstressed anisotropic plate,

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3

Ullah, Irfan. "Caracterização da subsuperfície rasa através da curva da razão espectral H/V e da inversão conjunta das curvas de dispersão e elipticidade." Universidade de São Paulo, 2017. http://www.teses.usp.br/teses/disponiveis/14/14132/tde-04062018-101840/.

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A destruição causada por um terremoto depende de muitos fatores, como características e profundidade da fonte, magnitude, distância epicentral e da configuração geológica da área. A destruição causada devido à configuração geológica da área é denominada como efeito local. A modelagem do efeito local implica na determinação do tempo e nível de vibração e do efeito de amplificação do deslocamento. As propriedades elásticas dos materiais geológicos (velocidade das ondas de compressão e de cisalhamento, densidade, espessura da camada de solo, etc.) podem ser obtidas por diversos métodos geofísicos

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4

Pei, Donghong. "Modeling and inversion of dispersion curves of surface waves in shallow site investigations." abstract and full text PDF (free order & download UNR users only), 2007. http://0-gateway.proquest.com.innopac.library.unr.edu/openurl?url_ver=Z39.88-2004&rft_val_fmt=info:ofi/fmt:kev:mtx:dissertation&res_dat=xri:pqdiss&rft_dat=xri:pqdiss:3275830.

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5

Latini, Marco. "Mixing in Curved Pipes." Scholarship @ Claremont, 2001. https://scholarship.claremont.edu/hmc_theses/129.

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Over the previous summer I studied mixing of a passive tracer by flow in a straight cylindrical pipe, under the supervision of prof. Bernoff. The mixing process can be thought of as the successive action of advection by the fluid flow and diffusion modeled by random walks. With this method we were able to distinguish three different regimes. For short times, diffusion is more relevant than advection and we observed a Gaussian longitudinal distribution of the concentration. In an intermediate regime, advection by the shear is dominant over longitudinal diffusion and we observed a distinctively

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6

Asabere, Philip. "COMPARISON OF DISPERSION CURVES ACQUIRED USING MULTICHANNEL ANALYSIS OF SURFACE WAVES WITH VARIOUS STRIKER PLATE CONFIGURATIONS." Master's thesis, Temple University Libraries, 2016. http://cdm16002.contentdm.oclc.org/cdm/ref/collection/p245801coll10/id/368445.

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Civil Engineering<br>M.S.C.E.<br>There is growing appreciation and research regarding geophysical methods to evaluate near surface soil properties in geotechnical engineering. Geophysical methods are generally non-destructive test (NDT) methods that do not necessitate traditional sampling of soils. Instead, they rely on application of input signals and deduction of soil properties from the measured response of the domain. Geophysical methods include various seismic, magnetic and nuclear techniques applied at the surface and/or subsurface within boreholes. Surface seismic methods, which include

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7

Koreck, Juergen. "Computational characterization of adhesive bond properties using guided waves in bonded plates." Thesis, Available online, Georgia Institute of Technology, 2006, 2006. http://etd.gatech.edu/theses/available/etd-08252006-064856/.

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Thesis (M. S.)--Civil and Environmental Engineering, Georgia Institute of Technology, 2007.<br>Jacobs, Laurence, Committee Chair ; Qu, Jianmin, Committee Member ; Valle, Christine, Committee Co-Chair.

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8

Amjad, Umar. "Multi-Component Structural Health Assessment Using Guided Acoustic Waves." Diss., The University of Arizona, 2014. http://hdl.handle.net/10150/344230.

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In this dissertation different structural materials (aluminum and steel) with different geometrical shapes (plates, pipes and bars) are studied for damage detection with guided waves. Specific guided wave modes (also known as Lamb wave modes for plate type structures) are generated in a laminated aluminum plate for damage detection and quantification using a broad band piezoelectric transducer structured with a rigid electrode. Appropriate excitation frequencies and modes for inspection are selected from theoretical and experimental dispersion curves. Sensitivity of anti-symmetric and symmetri

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Melo, Emerson Gonçalves de. "Integração monolítica de guias de onda, curvas e junções em Y baseados em cristais fotônicos planares de silício e com baixas velocidades de grupo." Universidade de São Paulo, 2017. http://www.teses.usp.br/teses/disponiveis/3/3140/tde-15012018-150947/.

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A fotônica em silício é um campo de pesquisas emergente com grande potencial para contribuir com a resolução de alguns dos problemas tecnológicos da atualidade. O gargalo imposto por interconexões metálicas na expansão da taxa de transmissão de dados em sistemas de comunicação como os de computadores de alto desempenho talvez seja um dos maiores desafios a serem superados. A propagação de luz em baixas velocidades de grupo e com controle de dispersão é uma das linhas de pesquisa atuais nas quais se busca explorar de forma mais eficiente as propriedades ópticas do silício, e assim, aumentar a c

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10

Tsarsitalidou, Christina. "Inversion of Rayleigh-wave dispersion curves using a finite-element eigenvalue/eigenvector solver, applied to the Alpine region and Italian peninsula." Master's thesis, Alma Mater Studiorum - Università di Bologna, 2019. http://amslaurea.unibo.it/18152/.

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Questa tesi si pone come obiettivo lo studio del processo d'inversione nel caso di curve di dispersione delle onde di Rayleigh, con lo scopo di determinare il profilo della velocità delle onde S. Ho utilizzato due diversi metodi. Il primo tipo riguarda un approccio perturbativo basato sul metodo degli elementi -finiti; il secondo, è un metodo di calcolo diretto basato sulla formula di Dix e costituisce un metodo non perturbativo. Quest'ultimo fornisce un modello iniziale che potrà essere in seguito ottimizzato attraverso l'approccio perturbativo. Inizialmente, test basati su dati sinte

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Camolli, Martina. "Il profilo di dispersione di velocità nell'ammasso globulare ngc 2808." Master's thesis, Alma Mater Studiorum - Università di Bologna, 2014. http://amslaurea.unibo.it/7412/.

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I GC rappresentano i laboratori ideali nei quali studiare la dinamica stellare e i suoi effetti sull'evoluzione stellare; infatti, sono gli unici sistemi astrofisici soggetti a quasi tutti i processi fisici noti nella dinamica stellare, entro il tempo scala dell'età dell'Universo. Questo lavoro di tesi si inserisce nell'ambito di un progetto di ricerca che mira ad una dettagliata caratterizzazione dell'evoluzione dinamica dei GC della Galassia. In particolare, la misura delle velocità radiali di un ampio campione di stelle poste a differenti distanze dal centro dell’ammasso permette di deriva

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Barbosa, Itamar Magno. "Estudo das dispersões metrológicas em redes neurais artificiais do tipo Multilayer Perceptrons através da aplicação em curvas de calibração." Universidade de São Paulo, 2009. http://www.teses.usp.br/teses/disponiveis/3/3142/tde-12082010-113757/.

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Este trabalho é um estudo das dispersões metrológicas em aproximações de funções tidas como não conhecidas ou não totalmente conhecidas. A metodologia alternativa para esse fim são as redes neurais artificiais do tipo Multilayer Perceptrons (MLP), aqui utilizadas como aproximadoras de funções. As funções aproximadas são curvas de calibração decorrentes de indicações de instrumentos ou sistemas de medição numa calibração. Essas curvas levam consigo propriedades metrológicas e possuem, neste trabalho, papel de ponte entre os elementos considerados da teoria metrológica e os elementos considerado

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Reis, Alexsandro Nogueira. "Análise de guias de ondas pelos métodos vetorial magnético e dos elementos-finitos." Universidade do Estado do Rio de Janeiro, 2011. http://www.bdtd.uerj.br/tde_busca/arquivo.php?codArquivo=2507.

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Neste trabalho, é apresentada uma formulação apropriada à análise de guias de ondas eletromagnéticos, cobrindo do espectro de microondas até o da óptica. Nas regiões a partir do ultravioleta, os comprimentos de onda são equivalentes às dimensões atômicas e a formulação necessita de uma abordagem quântica, que não é considerada neste estudo. A formulação é fundamentada nos métodos vetorial magnético e dos elementos finitos (MEF), em meios não homogêneos, anisotrópicos e não dissipativos, embora a dissipação possa ser facilmente introduzida na análise. Deu-se preferência à formulação com o ca

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14

Oliveira, Vanessa Vaz de. "Quantificação e avaliação do coeficiente de dispersão longitudinal em cursos d\'água." Universidade de São Paulo, 2013. http://www.teses.usp.br/teses/disponiveis/18/18138/tde-27082014-144417/.

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Um parâmetro físico essencial na modelagem matemática de qualidade de água visando a análise do impacto causado pelo lançamento de efluentes nos corpos d\'água superficiais é o coeficiente de dispersão longitudinal (DL). Portanto, a devida quantificação desse parâmetro é de grande importância para garantir a confiabilidade dos resultados de um modelo matemático de qualidade de água. Sendo assim, o presente trabalho propôs a quantificação de tal parâmetro. Para isso foram efetuados ensaios de campo de estímulo-resposta com traçador salino (cloreto de sódio) em dois cursos d\'água de pequeno por

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Groth, Eduardo Becker. "Propagação de ondas de tensão em hastes retangulares no intervalo de frequência de (0;100 [KHz])." reponame:Biblioteca Digital de Teses e Dissertações da UFRGS, 2016. http://hdl.handle.net/10183/142694.

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Essa dissertação aborda o tema de propagação de ondas de tensão em hastes metálicas retangulares. Este tipo de onda pode ser utilizada como base na verificação da integridade estrutural através de um ensaio não destrutivo (END). A propagação de ondas elásticas em sólidos apresenta muito potencial quando se deseja estimar a integridade de determinada estrutura. Porém para transformar esse fenômeno físico em uma técnica aplicável na detecção de danos, alguns passos devem ser seguidos, dentre eles: a compreensão das características de propagação da estrutura em estudo, in teração das ondas elásti

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Idzi, Javier Luis. "Estudio numérico de la propagación de ondas guiadas en rieles ferroviarios." reponame:Biblioteca Digital de Teses e Dissertações da UFRGS, 2017. http://hdl.handle.net/10183/172119.

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In recent decades techniques related to the measurement of elastic waves have advanced significantly. It is now possible with relatively inexpensive equipment to record amplitudes and frequency bands that were unthinkable two decades ago. This has led to the development of theoretical topics which application was questionable until not long ago, to profit from new technological potential in obtaining more and better experimental information. In this context the study of the propagation of guided waves in solids is presented as a knowledge that allows to detect damage with efficiency and econom

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Ahmed, Mustofa N. "A Study of Guided Ultrasonic Wave Propagation Characteristics in Thin Aluminum Plate for Damage Detection." University of Toledo / OhioLINK, 2014. http://rave.ohiolink.edu/etdc/view?acc_num=toledo1387732124.

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18

Busch, Xavier. "Effets dispersifs et dissipatifs en théorie quantique des champs en espace-temps courbe pour modéliser des systèmes de matière condensée." Thesis, Paris 11, 2014. http://www.theses.fr/2014PA112205/document.

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Les deux principales prédictions de la théorie quantique des champs en espace-temps courbe, à savoir la radiation de Hawking et la production de paires de particules ayant lieu dans un espace-temps non stationnaire, n'ont jamais été testé expérimentalement et impliquent toutes deux des processus à ultra haute énergie. En conséquence, de telles prédictions doivent être considérées prudemment. En utilisant l'analogie avec des systèmes de matière condensée mise en avant par Unruh, leur analogue pourrait être testé en laboratoire. Par ailleurs, dispersion et dissipation sont toujours présentes dan

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19

Gasmi, Noura. "Propagation des ondes magnéto-électro-élastiques dans les systémes multicouches et les cristaux phononiques." Thesis, Ecole centrale de Lille, 2014. http://www.theses.fr/2014ECLI0014.

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Cette thèse porte sur la propagation des ondes magnéto-électro-élastiques dans les structures inhomogènes, et tout particulièrement de l’effet d’un champ magnétique externe sur des structures multicouches et des cristaux phononiques combinant des matériaux à la fois piézoélectriques et magnéto-élastiques. Pour déterminer les caractéristiques des ondes se propageant dans ces structures magnéto-électro-élastiques, un modèle de matériau piézomagnétique équivalent à un matériau magnéto-élastique en couche mince, polarisé à saturation autour d’une position d’équilibre définie par l’orientation et l

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20

Manzini, Valeria. "Determinazione della massa in astrofisica." Bachelor's thesis, Alma Mater Studiorum - Università di Bologna, 2018. http://amslaurea.unibo.it/15651/.

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Importanza della conoscenza della massa degli oggetti in astrofisica. Presentazione dei principali metodi di determinazione della massa di stelle e galassie. Dimostrazione del calcolo della massa di stelle binarie, assunti come noti alcuni parametri osservativi. Relazione Massa-Luminosità per stelle di sequenza principale. Derivazione e commento alle curve di rotazione di galassie a spirale. Descrizione di un semplice metodo per ricavare la massa di una generica galassia ellittica.

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Querejeta, Coma Marina. "Evolutionary history of two Iberian Soricomorpha: genomics, phyligeography and dispersal patterns = Historia evolutiva de dos soricomorfos ibéricos genómica, filogeografía y patrones de dispersión." Doctoral thesis, Universitat de Barcelona, 2017. http://hdl.handle.net/10803/406949.

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The study of intraspecific diversity is essential in ecology and evolution as they reveal fine-scale patterns and it is crucial in conservation planning. The main aim of this thesis is to study the evolutionary history of two Iberian Soricomorpha: The Pyrenean desman (Galemys pyrenaicus) and the Mediterranean water shrew (Neomys anomalus). Both mammals are semi-aquatic and endemic to the Iberian Peninsula. To this end, different approaches were applied, such as genomics, phylogeography and species distribution modelling (SDM), in the three chapters of this thesis. In Chapter 1, the main aim w

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Lucena, Rodrigo Ferreira de. "Avaliações e testes dos métodos MASW e ReMi por meio do tratamento de dados empíricos e sintéticos em um programa de processamento e inversão desenvolvido em MATLAB e sua implicação em um problema geológico na Bacia de Taubaté." Universidade de São Paulo, 2016. http://www.teses.usp.br/teses/disponiveis/44/44138/tde-17062016-135652/.

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Os métodos de ondas superficiais com ênfase nas ondas Rayleigh foram utilizados como o núcleo desse trabalho de Doutorado. Inicialmente, as ondas Rayleigh foram modeladas permitindo o estudo de sensibilidade de suas curvas de dispersão sob diferentes configurações de parâmetros físicos representando diversos modelos de camadas, em que pôde ser observado parâmetros com maior e menor sensibilidade e também alguns efeitos provocados por baixas razões de Poisson. Além disso, na fase de inversão dos dados a modelagem das ondas Rayleigh foi utilizada para a construção da função objeto, que agregada

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Tufano, Giovanni. "K-space analysis of complex large-scale periodic structures." Thesis, Lyon, 2020. http://www.theses.fr/2020LYSEC008.

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Pendant sa mission opérationnelle, un moyen de transport est soumis à des excitations acoustiques, aérodynamiques et structurales à large bande. Les moyens de transport, tels que les avions, les lanceurs spatiaux, les bateaux, les voitures, les trains, etc., sont conçus pour accomplir un objectif principal, généralement de transférer une charge utile (passagers, marchandises, satellites, par exemple) d’un point à un autre, en maintenant toujours un niveau élevé de confort, de sécurité et de capacité de survie de la charge utile. Les réglementations nationales et internationales en matière de p

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Llerar, Meza Gerónimo. "Upscaling nonreactive solute transport." Doctoral thesis, Universitat Politècnica de València, 2009. http://hdl.handle.net/10251/5848.

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This thesis focuses on solute transport upscaling. Upscaling of solute transport is usually required to obtain computationally efficient numerical models in many field applications such as, remediation of aquifers, environmental risk to groundwater resources or the design of underground repositories of nuclear waste. The non-Fickian behavior observed in the field, and manifested by peaked concentration profiles with pronounced tailing, has questioned the use of the classical advection-dispersion equation to simulate solute transport at field scale using numerical models with discretizations th

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Eliasson, Peder. "Emittance preservation and luminosity tuning in future linear colliders." Doctoral thesis, Uppsala University, Department of Physics and Astronomy, 2008. http://urn.kb.se/resolve?urn=urn:nbn:se:uu:diva-8576.

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<p>The future International Linear Collider (ILC) and Compact Linear Collider (CLIC) are intended for precision measurements of phenomena discovered at the Large Hadron Collider (LHC) and also for the discovery of new physics. In order to offer optimal conditions for such experiments, the new colliders must produce very-high-luminosity collisions at energies in the TeV regime.</p><p>Emittance growth caused by imperfections in the main linacs is one of the factors limiting the luminosity of CLIC and ILC. In this thesis, various emittance preservation and luminosity tuning techniques have been t

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Silva, Elison da Fonseca e. "Propriedades de corrosão e caracterização química – metalográfica de próteses em aços inoxidáveis ISO 5832-9 e F138, removidas de pacientes." Universidade Federal de Juiz de Fora (UFJF), 2010. https://repositorio.ufjf.br/jspui/handle/ufjf/4322.

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Zhang, Runtong. "Measurement of effective diffusivity : chromatographic method (pellets & monoliths)." Thesis, University of Bath, 2013. https://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.608352.

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This thesis aims to find out the effective diffusivity (Deff) of a porous material – γ-alumina, using an unsteady state method with two inert gases at ambient condition with no reactions. For porous materials, Deff is important because it determines the amount of reactants that transfers to the surface of pores. When Deff is known, the apparent tortuosity factor of γ-alumina is calculated using the parallel pore model. The apparent tortuosity factor is important because: (a) it can be used to back-calculate Deff at reacting conditions; (b) once Deff with reactions is known, the Thiele modulus

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Valle, Orero Jessica. "Dynamics and thermal behaviour of films of oriented DNA fibres investigated using neutron scattering and calorimetry techniques." Phd thesis, Ecole normale supérieure de lyon - ENS LYON, 2012. http://tel.archives-ouvertes.fr/tel-00734670.

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The majority of structural studies on DNA have been carried out using fibre diffraction, while studies of its dynamics and thermal behaviour have been mainly performed in solution. When the DNA double helix is heated, it exhibits local separation of the two strands that grow in size with temperature and lead to their complete separation. This work has investigated various aspects of this phenomenon. The experiments reported in this thesis were carried out on films of oriented fibres of DNA prepared with the Wet Spinning Apparatus. Thus, sample preparation and characterisation are essential par

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CHIN, Fu-Hsing, and 秦復興. "Numerical Study of Layered System for the Dispersion curves of Surface Waves." Thesis, 2002. http://ndltd.ncl.edu.tw/handle/69937203813874061915.

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碩士<br>逢甲大學<br>土木及水利工程研究所<br>90<br>In this thesis, the dispersion curves of surface wave of layered systems are simulated in order to study the influence parameters of dispersion curve and the applicable range of spectral analysis of surface wave method. The influence parameters studied by using the computer program GREEN9 include the distance between first/second receivers and seismic source(d1,d2), number of layers, thickness of the first layer(h1), stiffness ratio between layers(E1/E2), damping ratio(D), bottom boundary, etc. In addition, six engineering profiles are modeled, by using the pr

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Chen, Dengren, and 陳登仁. "Damping Effects on Rayleigh Wave Dispersion Curves and Inversion Parameters for Layered Media." Thesis, 2012. http://ndltd.ncl.edu.tw/handle/21117420707508501981.

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碩士<br>國立聯合大學<br>土木與防災工程學系碩士班<br>100<br>As the traditional propagator matrix method not considering the damping effect, this study proposes a Damped modified propagator matrix method for calculation the Rayleigh wave dispersion curves of strata, and combined with the package of ReMi and the nonlinear waveform inversion method to invert strata’s parameters and compare differences of the dispersion curves and parameters for different damping ratios. This study first designed a series of containing damping formation models and use Damped modified propagator matrix for obtaining Rayleigh dispersion

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Ke, Ying-tzu, and 柯盈慈. "Preliminary Study on Evaluation of the integrity of RC Structure Strengthened by External Steel Plates using the Dispersion Curves of Lamb Wave Group Velocity." Thesis, 2010. http://ndltd.ncl.edu.tw/handle/46708945164414815865.

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碩士<br>朝陽科技大學<br>營建工程系碩士班<br>98<br>Concrete structures strengthened by steel plate have been used for more than a decade. As full bonding between the steel and matrix concrete is essential for effectively transmitting loading, infilling must be fully filled inside the gap between steel plate and concrete. The defects which are enclosed inside the steel plate may not be observed by visual observation. Present research is a preliminary study on using the dispersive characteristics of the Lamb wave modes traveling within the steel layer to assess the bonding condition between steel plate and subst

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Řičařová, Veronika. "Dálkové šíření Rumex alpinus." Master's thesis, 2011. http://www.nusl.cz/ntk/nusl-297565.

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Long-distance dispersal of Rumex alpinus was studied in the Giant Mountain in the National Park. The invasion of R. alpinus is there kind of problem. The work builds on a thesis from year 2007 (20007 Červenková), in which was made the model of the invasion of R. alpinus in the area of the Giant Mountain. The measurements of the seeds spread take place at four localities, three of them were for measuring of water dispersal and one was for measuring of winter dispersal. Anemochory was measured using traps in the meadow up to a distance of 50 m. The seeds were dispersed by wind to a distance of 2

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Han, Je Heon. "Investigation on Wave Propagation Characteristics in Plates and Pipes for Identification of Structural Defect Locations." Thesis, 2013. http://hdl.handle.net/1969.1/151345.

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For successful identification of structural defects in plates and pipes, it is essential to understand structural wave propagation characteristics such as dispersion relations. Analytical approaches to identify the dispersion relations of homogeneous, simple plates and circular pipes have been investigated by many researchers. However, for plates or pipes with irregular cross-sectional configurations or multi-layered composite structures, it is almost impossible to obtain the analytical dispersion relations and associated mode shapes. In addition, full numerical modeling approaches such as

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Βαβουράκης, Βασίλειος. "Χρήση μεθόδων συνοριακών στοιχείων και τοπικών ολοκληρωτικών εξισώσεων χωρίς διακριτοποίηση για την αριθμητική επίλυση προβλημάτων κυματικής διάδοσης σε εφαρμογές μη-καταστροφικού ελέγχου". Thesis, 2006. http://nemertes.lis.upatras.gr/jspui/handle/10889/845.

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Abstract:

Ο στόχος της παρούσας διδακτορικής διατριβής είναι διττός: η ανάπτυξη και η εφαρμογή αριθμητικών τεχνικών για την επίλυση προβλημάτων που εμπίπτουν στην περιοχή του Μη-Καταστροφικού Ελέγχου. Συγκεκριμένα αναπτύχθηκαν η Μέθοδος των Συνοριακών Στοιχείων (ΜΣΣ) και η Μέθοδος των Τοπικών Ολοκληρωτικών Εξισώσεων χωρίς Διακριτοποίηση για την αριθμητική ανάλυση στατικών και μεταβατικών προβλημάτων στο πεδίο της ελαστικότητας και της αλληλεπίδρασης ελαστικού με ακουστικό μέσο στις δύο διαστάσεις. Σημαντικό μέρος της διδακτορικής διατριβής αποτέλεσε η ανάπτυξη προγράμματος ηλεκτρονικού υπολογιστή, το οπ

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