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 38 for “"Body wave"”.
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The structure of the earth's mantle from body wave observations.
Thesis. 1975. Sc.D.--Massachusetts Institute of Technology. Dept. of Earth and Planetary Sciences.
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Simulation of dynamic on-body wave propagations : comparison with measured values.
Wireless body area network (WBAN) technology shows potential for improving human quality of life by facilitating remote, long-term health monitoring. Designing small, wearable, and power efficient on-body WBAN sensors requires an understanding of electromagnetic (EM) wave propagation behavior on …
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Numerical Analysis and Parameter Optimization of Portable Oscillating-Body Wave Energy Converters
… proximity to global population regions, ocean wave energy shows major promise. Although much wave energy converter development has focused on large-scale power generation, there is also increasing interest in small-scale applications for powering the blue economy. In this thesis, the objective …
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Hydrodynamic Design Optimization and Wave Tank Testing of Self-Reacting Two-Body Wave Energy Converter
… renewable energy sources. The total available wave energy resource for the United States alone is 2,640 TWh/yr; nearly two thirds of the 4,000 TWh of electricity used in the United States each year. It is estimated that nearly half of that available energy is recoverable through wave energy …
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An investigation of body wave magnitude using the new digital seismic research observatories plus conventional catalogue data
Thesis (M.S.)--Massachusetts Institute of Technology, Dept. of Earth and Planetary Science, 1979.
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Combining body wave tomography, surface wave inversion, seismic interferometry and laboratory measurements to characterize the black shales on Bornholm at different scales
… was analyzed with traveltime tomography, surface wave inversion and seismic interferometry to obtain the P-wave and S-wave velocity models of the subsurface. The P-wave velocity models which were determined for all three profiles clearly locate the Alum Shale layer between the Komstad Limestone …
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Advanced analysis of complex seismic waveforms to characterize the subsurface Earth structure
This thesis includes three major parts, (1) Body wave analysis of mantle structure under the Calabria slab, (2) Spatial Average Coherency (SPAC) analysis of microtremor to characterize the subsurface structure in urban areas, and (3) Surface wave dispersion inversion for shear wave velocity …
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Autocorrelation Analysis of the Seismic Data Recorded on Mars
… method to retrieve two types of seismic phases, body-wave reflection signals and Mars orbiting surface wave signals. The body-wave reflection signal originated from subsurface interfaces of Mars can inform the depth range of these seismic boundaries, including Moho, olivine-wadsleyite transition …
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Development of the Spectral-Analysis-of-Body-Waves (SABW) method for downhole seismic testing with boreholes or penetrometers
… been used to calculate shear and compression wave velocities in soil and rock layers. This time-domain method requires an operator to pick the first arrival or other reference point of each seismic wave in the time record. Picking these reference points correctly is critical in calculating …
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Velocity and Q from reflection seismic data
… longer necessary. For constant Q, the dispersive body wave velocity, p(v), is found to be p(v) = (p(v<sub>N</sub>)/(1+(1/2Q H(-v)/v)) where H denotes numerical Hilbert transformation, p(v) is the phase velocity at the frequency v, and p(v<sub>N</sub>) is the phase velocity at Nyquist. From (1) it …
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Modeling a bender element test using Abaqus Finite Element Program
… at a resolution of a twentieth of the shear wavelength and the integration time step has a negligible effect on the observed wave velocity. Moreover, it is possible to reproduce an uniaxially stressed bender element experiments of unsaturated Ticino sand in an Abaqus Finite Element Method …
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P- and S- wave tomography of the crust and uppermost mantle in China and surrounding areas
… and uppermost mantle in China from the P- and S-wave travel-time tomography. The main contributions of this research are: 1) introducing the adaptive moving window method to obtain 2338 1D P and S models in China; 2) introducing a tomographic method to perform the 3D body wave travel-time …
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Parametric Excitation of a DWSC
… variation in roll stiffness because of a regular wave (the variation in roll stiffness is an input to the stability analysis) and secondly for simulating the coupled heave-sway-roll EOM. Both time-domain analysis and stability analysis are done for sea states of interest and for examining …
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Global investigation of large earthquakes using long-period seismic data
… the Earth’s normal modes, which are standing waves resulting from the interference of surface waves travelling in opposite directions. We start by carrying out earthquake source validation tests for a recent source inversion technique (SCARDEC), which shows a tendency for steeper fault dip …
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Calculations of three-body scattering amplitudes
… study two techniques for the calculation of threebody scattering amplitudes. The first is a variational principle based on the Faddeev equations. In form it resembles a Schwinger principle. The wave functions that are varied are products of the two-body potentials and the normal three-body wave …
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Improved wave functions for quantum Monte Carlo
… quantum systems. QMC calculations based on many-body wave functions are considerably more accurate than density functional theory methods, and their accuracy rivals that of the most sophisticated quantum chemistry methods. This thesis is concerned with the development of improved wave function …
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Studies of Seismic Sources in Antarctica Using an Extensive Deployment of Broadband Seismographs
… the traditional first arriving impulsive P and S waves as well as events classified as 'slow' earthquakes with no impulsive P-waves. I find evidence of tectonic events in East Antarctica (representing intraplate earthquakes within a stable craton), icequake events in the Transantarctic Mountains …
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Teleseismic P Wave Attenuation in the Upper Mantle Beneath the United States
… by EarthScope™'s Transportable Array, the P wave amplitude spectra were analyzed to examine seismic attenuation patterns in the upper mantle. 2.5 million inter-station P wave spectral ratios were inverted for maps of relative t* variations across the United States in multiple frequency bands …
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Advances in the visualization and analysis of boundary layer flow in swimming fish
… difference in friction drag between the rigid-body and swimming cases. In swimming, separation was, on average, delayed. Therefore, pressure drag was estimated on the basis of thickness ratio and used to calculate an upper-bound total drag on a swimming fish. Total drag was used to determine …
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