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.
Results
Showing 1 to 10 of 10 for “"wave travel time"”.
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Relationship of bacterial infection and stress wave travel time in red oak lumber
… during drying. It also extends the drying time. Bacterial infection is hard to identify before drying without the use of costly, time- consuming tests. Thus, there is a need for an inexpensive, rapid and accurate method for the identification that can be used at a mill. This research …
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Evolution of the oceanic lithosphere and shear wave travel time residuals from oceanic earthquakes
Thesis. 1976. M.S.--Massachusetts Institute of Technology. Dept. of Earth and Planetary Sciences.
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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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In-situ permeability estimation : a comparison between acoustic and NMR logs
… estimation of formation permeability from full waveform acoustic and nuclear magnetic resonance (NMR) logs in petroleum well logging has improved significantly in recent years. In this thesis, we review the methods of permeability estimation from Stoneley waves and provide permeability …
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Mapping of the Quasi-periodic Oscillations at the Flank Magnetopause into the Ionosphere
… estimated the ionospheric location, area, and travel time of quasi-periodic oscillations originating from the magnetospheric flanks. This was accomplished by utilizing global and local MHD models and Tsyganenko semi-empirical magnetic field model on multiple published and four new cases …
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The tectonics and three-dimensional structure of spreading centers--microearthquake studies and tomographic inversions
… studies or tomographic inversion of travel times. Results of these studies are used to constrain the spatial variability of physical properties and processes beneath the axis of spreading and, together with other observations, the temporal characteristics of crustal accretion and …
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Determining the optimal river gauge location for a flood early warning system in Uganda using HEC-RAS and AHP
… imminent flooding. A minimum flood warning lead time of 2 hours was requested by the American Red Cross. Although there is an existing river gauge situated upstream of Butaleja, at Busiu Bridge, it was not known whether flood warning thresholds from Busiu Bridge could provide an adequate lead …
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The Study of Magnetotail Dynamics and their Ionospheric Signatures using Magnetohydrodynamic Simulation Model: OpenGGCM
… coupling processes. The first part focuses on travel time and characteristics of waves produced in the magnetotail. These waves represent the onset of the tail reconnection and substorms in the ionosphere. To investigate signal propagation paths and signal travel times, single impulse or …
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The tectonics and three-dimensional structure of spreading centers : microearthquake studies and tomographic inversions
… studies or tomographic inversion of travel times. Results of these studies are used to constrain the spatial variability of physical properties and processes beneath the axis of spreading and, together with other observations, the temporal characteristics of crustal accretion and …
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Variations in structure and tectonics along the Mid-Atlantic Ridge, 23⁰N and 26⁰N
… uniformly both along the ridge axis and with time. Rather, it has been proposed that the ridge axis can be divided into a number of distinct segments or spreading cells. This thesis investigates the segmentation model by studying the variability in the structure and tectonics within spreading …