Global ETD Search
Search theses and dissertations gathered from participating repositories worldwide. Every result links back to the library that holds it. No account is needed.
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Showing 1 to 20 of 170 for “"Surface wave"”.
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High frequency surface wave radar demonstrator
High Frequency Surface Wave Radar (HFSWR) is used around the globe for the mapping of sea currents and coastal monitoring of the Exclusive Economic Zone. Decision to build an HF radar at the University of Cape Town (UCT) was made by Daniel O’Hagan and Andrew Wilkinson in February 2015 immediately …
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Surface Wave Analysis in Laterally Varying Media
This work studies the possibility of using surface wave analysis as a tool for a robust estimation of the S-wave velocity behaviour in laterally varying media. The surface wave method, in fact, can be effectively adopted for different purposes and at different scales, but I focused on the …
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Surface Wave Propagation and Global Crustal Tomography
… calculate Born sensitivity kernels for Rayleigh-wave phase and amplitude measurements that are valid in regions near seismic stations. Calculations of sensitivity kernels for inter-station measurements show that exact travelling-wave representation of Green tensor is necessary when station …
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Sea surface wave reconstruction from marine radar images
… which is being increasingly used to measure sea surface waves nowadays. In this thesis, how to reconstruct sea surface wave elevation maps from X-band marine radar images and do wave field prediction over short term in real time are discussed. The key idea of reconstruction is using dispersion …
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Surface wave propagation in 3-D anelastic media
Lateral perturbations in anelasticity (Q) and wave speed together provide important constraints on thermal and chemical structures in the mantle. In present-day tomography studies of global wave speed and anelasticity, the significance of 3-D wave speed and 3-D Q structures on surface wave travel …
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Ambient noise and surface wave dissipation in the ocean
… consensus that the sound generated by breaking waves is responsible for much of the ambient noise level in the ocean. While numerous field measurements have shown a strong correlation between the ambient noise spectrum level (N) in the range 100Hz to 25kHz and wind speed in the ocean, very …
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Estimation of sea surface wave spectra using acoustic tomography
… quasi-homogeneous and quasi-stationary sea surface wave frequency-direction spectra using acoustic tomography. The analysis of acoustic (mode and ray) phase and travel time perturbations due to a rough sea surface is presented. Two canonical waveguides (ideal shallow water and linear squared …
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Hydrogen surface wave plasma cleaning of the EUV collector
… pattern or immersion lithography to reduce the wavelength and size of the features on the transistor. Going forward, a new technique, extreme ultraviolet (EUV) lithography, is being developed to replace existing technology. EUV light is generated by a laser-produced plasma as opposed to an …
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Estimation of sea surface wave spectra using acoustic tomography
Thesis (Sc. D.)--Joint Program in Oceanographic Engineering (Massachusetts Institute of Technology, Dept. of Ocean Engineering; and the Woods Hole Oceanographic Institution), 1987.
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Ambient noise and surface wave dissipation in the ocean
Thesis (Ph. D.)--Massachusetts Institute of Technology, Dept. of Civil and Environmental Engineering, 1993.
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Exploiting Near Field and Surface Wave Propagation for Implanted Devices
… be employed. Additionally, taking advantage of surface wave propagation permits the use of single-wire RF transmission lines in biological tissue, offering more efficient signal routing over near field coupling resulting in controlled implant depth at low power budgets.</p><p>Due to the …
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Modelling of Electromagnetic Surface Wave Propagation for High-Speed Communications
Surface waves have been known as a low-loss electromagnetic mode supported by a single conductor for well over a century but little research has been dedicated to surface wave interactions with its surroundings and surface wave propagation on printed circuit boards and on multiple wires. This …
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Seismicity, tectonics, and surface wave propagation in the central Andes
Thesis (Ph.D.)--Massachusetts Institute of Technology, Dept. of Earth and Planetary Sciences, 1983.
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Numerical and asymptotic modeling of evolving nonlinear ocean surface wave fields
… and numerical modeling of nonlinear ocean surface wave fields. In particular, a development of an accurate numerical model for the evolution of nonlinear ocean waves, including extreme waves known as Rogue/Freak waves. Due to their elusive and destructive nature, the media often portrays …
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Surface wave techniques for the study of engineering structures and materials
… initiated the work on one dimensional Rayleigh waves.Their properties were established for the straight edge condition by following an analysis similar to that of the two dimensional case. Experiments were then carried out on the velocity dispersion of various circuits including the disk and a …
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Coded one-port acoustic surface-wave delay lines / by A.S. Burgess
x, 270 leaves, : ill., tables ; 30 cm.
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