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 1523 for “"subsurface"”.
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Subsurface Planetary Investigation Techniques and Their Role for Assessing Subsurface Planetary Composition
<p>Subsurface planetary investigation techniques are of high interest and importance for the scientific community. Not only they can enhance our knowledge of the history of planetary formation but also can lead to information about its future. Whether the investigation is being conducted remotely …
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Subsurface Precambrian of Saskatchewan
As determined from samples of cores and cuttings from boreholes that have penetrated the basement, and regional geophysical maps, the Precambrian rocks of Saskatchewan which occur beneath the Palaeozoic and later rocks consist of predominantly northtrending belts ot granitic and metamorphic rocks. …
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Low-Frequency Subsurface Electromagnetic Modeling
Subsurface electromagnetic (EM) methods are applied to obtain underground information that is not available from surface observations. This research develops numerical methods for subsurface electromagnetic modeling. The dissertation includes: (1) fast one-dimensional forward and inverse modeling, …
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Subsurface 3D integrated photonic devices
Submission published under a 24 month embargo labeled 'Closed Access', the embargo will last until 2025-05-01
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Subsurface Digital Twin and Emergence
Subsurface characterization stands at the nexus of humanity's growing demands for materials, energy, and safety amid the burgeoning population and rising living standards. However, challenges in subsurface characterization, rooted in conventional practices, functional silos, limited data density, …
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Numerical solution for subsurface reservoir simulation
Transport problems in porous media constitute an important field of scientific research in modern world, due to their broad applications in area such as petroleum engineering, water resources, pollutants transport and green- house gases sequestration to just mention few. The mathematical models …
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Continuous NAPL loss rates using subsurface temperatures
To view the abstract, please see the full text of the document.
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Approximate analytical solutions for modeling subsurface flow
Equations of subsurface flow of water, the Richards equation and the Boussinesq equation, have no known exact analytical solutions. Approximate analytical solutions to these equations have been developed under linearizing simplifications. In the first part of the dissertation two commonly used …
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Economic and Schedule Considerations in Subsurface Investigations
Made available in DSpace on 2014-12-13T19:31:33Z (GMT). No. of bitstreams: 1 7624174.pdf: 10771650 bytes, checksum: 8c33230459a8ab192c4cf41930f8e819 (MD5) Previous issue date: 1976
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Subsurface two-photon lithography: improvements and applications
… material is uniform throughout. When performing subsurface controllable refractive index via beam exposure (SCRIBE), two-photon lithography is implemented with a porous material as the writing medium, allowing different densities of photoresist to be created within. Thus, with SCRIBE, a variety …
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Subsurface imaging with reverse vertical seismic profiles
This thesis presents imaging results from a 3D reverse vertical seismic profile (RVSP) dataset measured at a hydrocarbon bearing pinnacle reef in northern Michigan. The study presented many challenges in seismic data processing and imaging, as the survey geometry was unique in several ways. Reverse …
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Degradation of gasoline oxygenates in the subsurface
… organics, if accidentally discharged into the subsurface, may rapidly spread and pose threats to groundwater. The purpose of this work was to evaluate the biodegradation potential of these oxygenates in soils and to determine the influence of subsurface environments on their degradation. …
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Degradation of pentachlorophenol by anaerobic subsurface microorganisms
Microbial populations from subsurface soil collected from a hydrocarbon contaminated site and a pristine site with no history of contamination had the ability to degrade pentachlorophenol (PCP) in anaerobic enrichment cultures. Increasing concentrations of PCP in nitrate, sulfate and yeast …
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Underground Britain: public perceptions of the geological subsurface
… to the ‘invisible’ world of the geological subsurface. This presents unique communication challenges because these technologies exist in a realm that can never be physically seen. This thesis addresses this issue by examining the psychological perceptions of residents in three villages in …
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Applications of Distributed Temperature Sensing in Subsurface Hydrology
Abstract In the study of dynamic subsurface processes there is a need to monitor temperature and groundwater fluxes efficiently in both time and space. Distributed Temperature Sensing has recently become more accessible to researchers in Earth Sciences, and allows temperatures to be measured …
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Sealing potential of heterogeneous caprock in subsurface storage
Submission published under a 24 month embargo labeled 'U of I Access', the embargo will last until 2027-08-01
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Optical coordination of surface and subsurface autonomous vehicles
… light communication to provide navigation for a subsurface sensing vehicle, by allowing it to follow a surface vehicle. This would allow for data collection at various depths, expanding the capability of the existing swarm, while maintaining the coordination of the swarm on the water's surface. …
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Effects of subsurface fracture interactions on surface deformation
Although the surface deformation resulting from the opening of a single fracture in a layered elastic half-space resembles the observed deformation at the InSalah site, it seems unlikely that only a single fracture is involved. This raises the question of how interaction among multiple fractures …
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Laboratory simulation of subsurface airflow beneath a building
… organic compounds (VOCs) into buildings due to subsurface soil or groundwater contamination. Oxygen replenishment rates beneath a building are significant for quantifying potential contaminant degradation rates within the vadose zone. Additionally, the migration of VOC soil gas vapors into …
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