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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.
41

Existence theory for linear vibration models of elastic bodies

De Villiers, Magdaline.. January 2009 (has links)
Thesis (MSc. (Natural and Agricultural Sciences)) -- University of Pretoria, 2009. / Summary in English. Includes bibliographical references (p. 125-126).
42

Transparency Property of One Dimensional Acoustic Wave Equations

Huang, Yin 24 July 2013 (has links)
This thesis proposes a new proof of the acoustic transparency theorem for material with a bounded variation. The theorem states that if the material properties (density, bulk modulus) is of bounded variation, the net power transmitted through the point z = 0 over a time interval [−T,T] is greater than some constant times the energy at the time zero over a spatial interval [0,Z], provided that T equals the time of travel of a wave from 0 to Z. This means the reflected energy of an input into the earth will be received. Otherwise, the reflections may not arrive at the surface. A proof gives a lower bound for material properties (density, bulk modulus) with bounded variation using sideways energy estimate. A different lower bound that works only for piecewise constant coefficients is also given. It gives a lower bound by analyzing reflections and transmissions of the waves at the jumps of the material properties. This thesis also gives an example to illustrate that the bounded variation assumption may not be necessary for the medium to be transparent. This thesis also discusses relations between the transparency property and the data of an inverse problem.
43

Doubly warped products /

Unal, Bulent, January 2000 (has links)
Thesis (Ph. D.)--University of Missouri-Columbia, 2000. / Typescript. Vita. Includes bibliographical references (leaves 129-131). Also available on the Internet.
44

Doubly warped products

Unal, Bulent, January 2000 (has links)
Thesis (Ph. D.)--University of Missouri-Columbia, 2000. / Typescript. Vita. Includes bibliographical references (leaves 129-131). Also available on the Internet.
45

Global well-posedness and scattering for the defocusing energy-supercritical cubic nonlinear wave equation

Bulut, Aynur 25 October 2011 (has links)
We study the initial value problem for the defocusing nonlinear wave equation with cubic nonlinearity F(u)=|u|^2u in the energy-supercritical regime, that is dimensions d\geq 5. We prove that solutions to this equation satisfying an a priori bound in the critical homogeneous Sobolev space exist globally in time and scatter in the case of spatial dimensions d\geq 6 with general (possibly non-radial) initial data, and in the case of spatial dimension d=5 with radial initial data. / text
46

Relativistic n-body wave equations in scalar quantum field theory /

Emami-Razavi, Mohsen. January 2006 (has links)
Thesis (Ph.D.)--York University, 2006. Graduate Programme in Earth and Space Science. / Typescript. Includes bibliographical references (leaves 86-90). Also available on the Internet. MODE OF ACCESS via web browser by entering the following URL: http://gateway.proquest.com/openurl?url_ver=Z39.88-2004&res_dat=xri:pqdiss&rft_val_fmt=info:ofi/fmt:kev:mtx:dissertation&rft_dat=xri:pqdiss:NR19789
47

Time and frequency domain scattering for the one-dimensional wave equation /

Browning, Brian L. January 1999 (has links)
Thesis (Ph. D.)--University of Washington, 1999. / Vita. Includes bibliographical references (p. 137-138).
48

Axiomatic approach to radiation reaction of scalar point particles in curved spacetime /

Quinn, Theodore C. January 2000 (has links)
Thesis (Ph. D.)--University of Chicago, Dept. of Physics. / Includes bibliographical references. Also available on the Internet.
49

Analysis and implementation of high-order compact finite difference schemes /

Tyler, Jonathan, January 2007 (has links) (PDF)
Thesis (M.S.)--Brigham Young University. Dept of Mathematics, 2007. / Includes bibliographical references (p. 100-102).
50

Practical imaging of complex geological structures using seismic prestack depth migration /

Zhu, Jinming, January 1997 (has links)
Thesis (Ph. D.)--Memorial University of Newfoundland, 1997. / Bibliography: leaves 180-187. Also available online.

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