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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.
21

Modelling Titan's surface and dynamic simulation and testing of the Huygens surface science package tiltsensor (TIL)

Ghafoor, Nadeem A.-L. January 2003 (has links)
No description available.
22

Surface wave interferometry

Halliday, David Fraser January 2009 (has links)
This thesis concerns the application of seismic interferometry to surface waves. Seismic interferometry is the process by which the wavefield between two recording locations is estimated, resulting in new recordings at one location as if a source had been placed at the other. Thus, in surface-wave interferometry, surface waves propagating between two receiver locations are estimated as if one receiver had recorded the response due to a source of surface-wave energy at the other receiver. In global and engineering seismology new surface-wave responses can allow for imaging of the subsurface, and in exploration seismology it has been proposed that these new surface-wave responses can allow for the prediction and removal of socalled ground-roll (surface waves that are treated as noise). This thesis presents a detailed analysis of surface-wave interferometry: using a combination of modelling studies, real-data studies, and theoretical analyses the processes involved in the application of interferometry to complex (both multi-mode and scattered) surface waves are revealed. These analyses identify why surface waves are often dominant in the application of interferometry, where errors may be introduced in the application of surface-wave interferometry, and how interferometry may be processed in such a way as to minimise those (and other) errors. This allows for the proposal of new data-processing strategies in the application of seismic interferometry to surface waves, potentially resulting in improved surface-wave estimates. Much of the work in this thesis focuses on the use of seismic interferometry to predict and subtract surface waves in land-seismic exploration surveys. Using insights from the presented analyses it is shown that seismic surface waves can be successfully predicted and removed from land-seismic data using an interferometric approach. However, the work in this thesis is not only limited to applications in exploration seismology. In addition to the ground-roll removal method, improved estimates of higher-mode and scattered surfaces waves may allow for more advanced imaging algorithms to be used in conjunction with seismic interferometry. Also, as a consequence of the analysis presented a Generalized Optical Theorem for Surface Waves is derived. This highlights a link between seismic interferometry and the optical theorem and may allow for further application of optical theorems in seismology.
23

The fractal structure of surface water waves near breaking

M��nzenmayer, Katja 27 July 1993 (has links)
The goal of this research project is to determine the fractal nature, if any, which certain surface water waves exhibit when viewed on a microscopic scale. We make use of the mathematical formulation of non-viscous fluids describing their physical properties. Using these expressions and including boundary conditions for free surfaces as well as taking the surface tension into consideration, we obtain a partial differential equation describing the dynamics of surface water waves. A brief introduction to the study of fractal geometry with several examples of well-known fractals is included. An important property of fractals is their non-integral dimension. Several methods of determining the dimension of a curve are described in this paper. Our wave equation is examined under different assumptions representing the conditions of a surface water wave near its breaking point. Solutions are developed using analytical and numerical methods. We determine the dimension of 'rough' solutions using one of the methods introduced and conclude that under certain conditions, surface water waves near their breaking point exhibit a fractal structure on a microscopic scale. / Graduation date: 1994
24

DIFFRACTION AND FOCUSSING OF ACOUSTIC SURFACE WAVES IN ANISOTROPIC MEDIA

Karst, Udo, 1943- January 1972 (has links)
No description available.
25

A new method for modeling surface wave propagation in heterogeneous media

Kocaoglu, Argun H. 12 1900 (has links)
No description available.
26

Rg wave dispersion tomography in northern Alabama

Kocaoglu, Argun H. 08 1900 (has links)
No description available.
27

Attenuation of the Lg wave in Alabama

Chen, Wei-Chieh David 08 1900 (has links)
No description available.
28

Low-voltage SAW amplifiers on multilayer GaAs/ZnO substrates

Cameron, Thomas P. 08 1900 (has links)
No description available.
29

Multichannel analysis of surface-wave multistrip couplers

Gordon, Kenneth Gregory. January 1975 (has links)
No description available.
30

Nonlinear surface wave interactions

Nassar, Abubakr A. (Abubakr Abbas) January 1974 (has links)
No description available.

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