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 14 of 14 for “"reflection imaging"”.
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Innovative Acoustic Reflection Imaging Techniques And Application To Clinical Breast Tomography
… We present a new technique for reconstruction of reflection images from UST data. We have extended the planar Kirchhoff migration method used in geophysics, and combined it with sound speed and attenuation data obtained from the transmission signals to create reflection ultrasound images that are …
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Seismic reflection imaging of near surface structures using the Common Reflection Surface (CRS) Stack Method
… for processing of shallow and ultrashallow reflection data. The CRS stack is a seismic imaging method established for oil and gas exploration that is similar in concept to the conventional CMP stack method. Unlike the CMP stack, the CRS stack process is not confined to single CMP gathers …
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Application of P-wave Reflection Imaging to Unknown Bridge Foundations and Comparison with Other Non-Destructive Test Methods
… to compare these methods to an ultrasonic P-wave reflection imaging system. The ultrasonic P-wave reflection system has tremendous potential to provide more information and address several short-comings of other NDT methods. A laboratory study was initiated to explore various aspects related to …
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The geologic history of Lake of the Woods, Minnesota, reconstructed using seismic-reflection imaging and sediment core analysis
… sediment accumulation.High-resolution seismic-reflection (CHIRP) data collected from the southern basin of LOTW reveal up to 28 m of stratified lacustrine sediment deposited on top of glacial diamicton and bedrock. Five seismic units (SU A-E) were identified and described based on their …
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Analytical applications of nanostructured plasmonic crystals
… surface-sensitive chemical analysis and imaging, all of which rely on the interactions between the local environment and the evanescent electric fields generated by the surface plasmons at the metal-dielectric interface. Plasmonic crystals are a versatile platform for the tunable coupling …
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Techniques and Applications of Mesoscopic Fluorescence Imaging
… in bioscience and medical research, mesoscopic imaging exchanges resolution for penetration depth, which offers hundreds of micrometer resolution and up to several millimeter penetration depth. By introducing fluorescence dyes or with intrinsic fluorescence, much higher contrast of images can be …
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The reprocessing and extended interpretation of seismic reflection data recorded over the Hayesville-Fries thrust sheet in southwestern North Carolina
… Core Hole (ADCOH) southern Appalachian seismic reflection data was focused on improving the reflection imaging and hence interpretability of seismic signatures previously interpreted as duplexes created by thrust stacking of thin beds of Paleozoic shelf strata. The reprocessed data are used to …
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Building Velocity Models for Steep-Dip Prestack Depth Migration through First Arrival Traveltime Tomography
Although the petroleum industry has imaged reflections from the sides of salt domes, steeply dipping structures have not been imaged as reflectors outside of sedimentary basins; to do so requires appropriate data acquisition, prestack depth migration, and an excellent seismic velocity model. …
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Advanced geophysical studies of accretion of oceanic lithosphere in Mid-Ocean Ridges characterized by contrasting tectono-magmatic settings
… propagation modeling, 3D multi-channel seismic reflection imaging, waveform inversion, streamer tomography, and near-bottom magnetics) to study lithospheric accretion processes in MORs characterized by contrasting tectono-magmatic settings: the magmatically dominated EPR axis between …
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Advanced geophysical studies of accretion of oceanic lithosphere in Mid-Ocean Ridges characterized by contrasting tectono-magmatic settings
… propagation modeling, 3D multi-channel seismic reflection imaging, waveform inversion, streamer tomography, and near-bottom magnetics) to study lithospheric accretion processes in MORs characterized by contrasting tectono-magmatic settings: the magmatically dominated EPR axis between …
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Seismicity and structure of the eastern Gawler Craton and Lake Eyre region
… However, active-seismic methods such as reflection imaging can be prohibitively expensive, particularly in remote areas. Therefore, to address these challenges, we utilize seismic stations in South Australia to determine basement depth based on the arrival time of the P-converted-to-S …
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Seismicity and structure of the eastern Gawler Craton and Lake Eyre region
… However, active-seismic methods such as reflection imaging can be prohibitively expensive, particularly in remote areas. Therefore, to address these challenges, we utilize seismic stations in South Australia to determine basement depth based on the arrival time of the P-converted-to-S …
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Seismic Imaging of a Granitoid-Greenstone Boundary in the Paleoarchean Pilbara Craton
… Australian scientists acquired deep seismic reflection data crossing a granitoid-greenstone boundary. Their processing did not image the geologically mapped steep dip of the boundary because standard methods limit the maximum dip. A 37-km section of these data were reprocessed using 2D …
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Subsurface Geophysical Investigations of Oneida Lake Ny: Insights Into Ice Sheet Processes and Deglaciation At Termination I
… High Intensity Radiated Pulse (CHIRP) seismic reflection data were used to image the Holocene and Proglacial Lake deposits within the lake. These high-fidelity data identify Holocene and proglacial lake deposits, and the top of the till and subglacial bedforms. The CHIRP data provide excellent …