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  • About
  • The Global ETD Search service is a free service for researchers to find electronic theses and dissertations. This service is provided by the Networked Digital Library of Theses and Dissertations.
    Our metadata is collected from universities around the world. If you manage a university/consortium/country archive and want to be added, details can be found on the NDLTD website.
1

Ultrasonic beam propagation in turbulent flow

Weber, Francis J. January 2004 (has links)
Thesis (M.S.)--Worcester Polytechnic Institute. / Keywords: ray trace method; turbulence; ultrasonic flowmeter. Includes bibliographical references (p. 157-168).
2

Diffuse ultrasonic scattering in heterogeneous media

Ghoshal, Goutam. January 2008 (has links)
Thesis (Ph.D.)--University of Nebraska-Lincoln, 2008. / Title from title screen (site viewed Jan. 13, 2009). PDF text: x, 131 p. : col. ill. ; 3 Mb. UMI publication number: AAT 3315884. Includes bibliographical references. Also available in microfilm and microfiche formats.
3

Analytical investigation of internally resonant second harmonic lamb waves in nonlinear elastic isotropic plates

Mueller, Martin Fritz. January 2009 (has links)
Thesis (M. S.)--Civil and Environmental Engineering, Georgia Institute of Technology, 2010. / Committee Chair: Laurence J. Jacobs; Committee Member: Jianmin Qu; Committee Member: Jin-Yeon Kim. Part of the SMARTech Electronic Thesis and Dissertation Collection.
4

The electromagnetic and acoustic properties of smoke particulates

Churches, David K. January 1999 (has links)
No description available.
5

Ultrasonic wave interactions with magnetic colloids

Chapman, John Richard January 2001 (has links)
No description available.
6

Interstitial hyperthermia of brain tumors /

Jelveh, Salomeh, January 1900 (has links)
Thesis (M.Sc.) - Carleton University, 2002. / Includes bibliographical references (p. 95-102). Also available in electronic format on the Internet.
7

An intelligent stand-alone ultrasonic device for monitoring local damage growth in civil structures

Pertsch, Alexander Thomas. January 2009 (has links)
Thesis (M. S.)--Civil and Environmental Engineering, Georgia Institute of Technology, 2010. / Committee Chair: Jacobs, Laurence J.; Committee Co-Chair: Wang, Yang; Committee Member: Kim, Jin-Yeon. Part of the SMARTech Electronic Thesis and Dissertation Collection.
8

Aplicação de ondas longitudinais criticamente refratadas para a medição de tensões em dutos / Application of longitudinal critically refracted waves to measure stress in pipelines

Andrino, Marcilio Haddad 27 July 2007 (has links)
Orientador: Auteliano Antunes dos Santos Junior / Tese (doutorado) - Universidade Estadual de Campinas, Faculdade de Engenharia Mecanica / Made available in DSpace on 2018-08-10T18:53:08Z (GMT). No. of bitstreams: 1 Andrino_MarcilioHaddad_D.pdf: 2714544 bytes, checksum: e672b70a8b7d69be2cd8e546921e9f58 (MD5) Previous issue date: 2007 / Resumo: Os dutos têm se tornado o principal meio de transporte para gás natural, petróleo e derivados nas últimas décadas. Diversos novos projetos, visando a extensão da malha dutoviária atual estão sendo implantados e as dimensões das redes de distribuição de países desenvolvidos mostram que este tipo de modal será cada vez mais utilizado, acompanhando o crescimento do Brasil. Dutovias com tais dimensões requerem esquemas de manutenção adequados, com técnicas otimizadas de inspeção. A falha, em muitos casos, pode levar a desastres ambientais, com conseqüências econômicas e sociais imensuráveis. Este trabalho tem como objetivo desenvolver uma nova metodologia para a medição de tensões mecânicas em dutos baseada na variação da velocidade de ondas longitudinais criticamente refratadas (ondas Lcr). Como objetivos específicos foram estudadas a influência da temperatura sobre o resultado da medição, a influência da textura do material para dutos e a determinação e validação do método matemático mais adequado para emprego na determinação das tensões. Para a determinação das tensões no duto foi construído um dispositivo especial para movimentar o conjunto de transdutores ao longo dos pontos de medição. Foram realizadas medições na direção longitudinal e transversal do duto e esses levantamentos foram comparados com medidas de tensão determinadas através de extensômetros. Os resultados finais da tese mostraram a excelente correlação entre a tensão aplicada e a resposta do sistema indicando que a técnica pode ser empregada em campo / Abstract: Pipelines have become the main transport means for natural gas, petroleum and derivatives in the last decades. Several new projects aiming the extension of the current pipeline mesh are being deployed and the size of distribution networks in developed countries show that this kind of modal will be increasingly used, following the growth of Brazil. Pipelines with such dimensions require proper schedules for maintenance, with optimized techniques of inspection. In many cases a flaw can lead to environmental disasters with economic and social consequences. This work is aimed to develop a new methodology for the measurement of mechanical stress in pipelines based in the variation of the speed of longitudinal critically refracted waves (Lcr waves). A more specific objectives, this study treats with the influence of the temperature on the measurement results, the influence of the texture of the material for pipelines and the determination and validation of the most suitable mathematical method for determination of the stress. For the determination of the stress in the pipeline a special device was constructed to move the set of transducers along the points of measurement. Measurements were performed in the longitudinal and transversal directions of the pipeline and the results were compared with stress measures determined by strain gages. The final results of the thesis showed the excellent correlation between the applied stress and the response of the system indicating that the technique can be employed in field / Doutorado / Mecanica dos Sólidos e Projeto Mecanico / Doutor em Engenharia Mecânica

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