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 20 of 124 for “"s-wave"”.
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Pair production of s-wave pi mesons
Thesis (Ph.D.) Massachusetts Institute of Technology. Dept. of Physics, 1956.
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Spin-triplet proximity effects in magnetically controlled heterostructures with s-wave superconductors
Historically superconductivity and ferromagnetism were largely seen as antagonistic order parameters due to the rapid depairing of conventional spin-singlet Cooper pairs in the presence of a magnetic exchange field. Over the last decade-and-half, experimental evidence has emerged for the generation …
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Mantle P and S wave velocity distributions from dT/d[delta] measurements.
Thesis (Ph. D.)--Massachusetts Institute of Technology, Dept. of Geology and Geophysics, 1969.
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Constraining the Radial Structure of Seismic Attenuation using Multiple S-Wave Datasets
… amplitude measurements from core-diffracted S waves (Sdiff) and core-reflected S waves (ScS), along with direct S and multiply reflected S waves (SSSS).We analyze 7,598 Sdiff, 463 ScS, 5,940 S, and 1,726 SSSS measurements from 448 earthquakes recorded globally between 2009-2017, significantly …
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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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S-wave velocity structure beneath the Kaapvaal Craton from surface-wave inversions compared with estimates from mantle xenoliths
Results from two-station surface-wave inversions across the Archean Kaapvaal craton of southern Africa are compared with seismic velocities estimated from approximately 100 mantle xenoliths brought to the surface in kimberlite pipes. As the xenoliths represent a snapshot of the mantle at the time …
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Determining the upper mantle seismic structure beneath the northern transantarctic mountains, Antarctica, form regional p- and s-wave tomography
… of the northern TAMs through regional body wave tomography. Relative travel-times were calculated for 11,182 P-wave and 8,285 S-wave arrivals from 790 and 581 Mw ≥ 5.5 events, respectively, using multi-channel cross correlation, and these data were then inverted for models of the upper …
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Dynamic reservoir characterization using P-wave and S-wave seismic time-lapse data at Postle field, Texas County, Oklahoma
Includes bibliographical references (leaves 106-108).
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Ultrasonic wave reflection measurements on stiffening and setting of cement paste
… of this research is to extend the use of P-wave and S-wave ultrasonic wave reflection (UWR) to monitor stiffening and setting of portland cement paste. The research focuses especially on the very early hydration period, during the first hours after mixing. For such purpose, it is necessary …
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Ultrasonic wave reflection measurements on self-compacting pastes and concretes
… to extend the use of combined longitudinal (P-wave) and shear (S-wave) ultrasonic wave reflection (UWR) to monitor the setting and stiffening of self-compacting pastes and concretes. An additional objective was to interpret the UWR responses of various modified cement pastes. A polymeric buffer …
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MANTLE FLOW AND TRANSITION ZONE DISCONTINUITIES BENEATH THE CARRIBEAN PLATE: CONSTRAINTS FROM SHEAR WAVE SPLITTING AND RECEIVER FUNCTION ANALYSES
… teleseismic SKS, SKKS, PKS (“XKS”) and local S wave splitting parameters is used to investigate lithospheric deformation and asthenospheric flow beneath the boundary zone of the North American and Caribbean plates and adjacent areas. A total of 4915 XKS and 1202 pairs of local S wave splitting …
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MATRIX FIELD THEORY: APPLICATIONS TO SUPERCONDUCTIVITY
… to describe both clean and disordered s-wave and d-wave superconductors and the quantum phase transitions associated with them. The thesis can be divided into three parts. The first part includes chapters 1 to 3. In chapter one a general physical introduction is given. In chapters two and …
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Wavefront Healing and Tomographic Resolution of Mantle Plumes
… anti-correlation between bulk sound speed and S wave speed imaged in the lowermost mantle, we use a Spectral Element Method (SEM) to simulate global seismic wave propagation in 3-D wavespeed models and measure frequency-dependent P-, S-, Pdiff- and Sdiff-wave traveltime anomalies caused by plume …
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Seismic waveform tomography with multicomponent data at a groundwater contamination site
This thesis develops an SH-wave version of frequency-domain, full waveform tomography, and applies it, together with traditional acoustic waveform tomography, to a multicomponent seismic data set acquired over a shallow contaminated aquifer at Hill Air Force Base, Utah. The study combines the high …
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Estimation of seismic parameters from multifold reflection seismic data by generalized linear inversion of Zoeppritz equations
… method is developed to estimate the P- and S-wave velocities and density ratio of two elastic, isotropic, and homogeneous media separated by a plane, horizontal boundary from P-wave reflection amplitude-versus-offset (AVO) data recorded at the surface. The method has for its basis the …
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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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Investigation of Iron-Based and Topological Superconductors via Point-Contact Spectroscopy
… are consistent with a two-gap isotropic s-wave model. This conclusion is supported by previously published results from thermal conductivity, angle-resolved photoemission spectroscopy (ARPES), and Raman spectroscopy, which confirm a lack of nodes in the order parameter and the presence of a …
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