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 28 for “"Stress change"”.
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A study of mechanical forces induced by low-energy (10-100 eV) electron irradiation of alkanethiol self-assembled monolayers on Au(111)
… layer, which will induce mechanical force changes on the gold substrate. In order to detect the stress change, AT SAMs were deposited on gold coated microcantilevers, which are silicon nitrate wafers of 0.6 micrometer thickness. Changes in the bending of these cantilevers were determined …
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Poroelastic modeling of groundwater and hydrocarbon reservoirs : investigating the effects of fluid extraction on fault stability
… of poroelasticity was used to calculate the stress changes resulting from fluid flow. Then, the resulting fault stability was evaluated with the the Coulomb Failure Function ([Delta]CFF). A COMSOL and MATLAB workflow was used to derive the results. Two applications were completed. The primary …
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Hydrologic behaviour and hydraulic properties of a patterned fen in Saskatchewan
… of the water table, and soil moisture changes produce changes in effective stress that lead to volume change in the highly compressible peat. This is particularly important for sites with thick peat deposits. Independent compressibility estimates were as high as 10-5 N/m2 in the upper …
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Dynamic links between short-term deformation and long-term tectonics: a finite element study
… I have explored the spatial-temporal strain and stress evolution during seismic cycles, and linked these results to long-term tectonics. In the central Andes, I found that much of the GPS-measured crustal shortening can be explained by interseismic and postseismic viscoelastic strains; the …
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Swelling behaviour of unsaturated fine grained soils
… of various laboratory tests such as a 100 mm stress path triaxial cell and a computer controlled oedometer. Centrifuge modelling was used as a link between the laboratory tests performed and an existing prototype experimental wall. Three types of soils with different plasticity have been …
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Novel Multitemporal Synthetic Aperture Radar Interferometry Algorithms and Models Applied on Managed Aquifer Recharge and Fault Creep
… nearby faults by inducing a negative Coulomb stress change. Projecting into the future, a suggested 2% annual increase in recharge volume through 2050 could mitigate land subsidence and reduce seismic hazards in coastal cities vulnerable to relative sea level rise. This integrated approach …
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A study of the deflection and strength of partially prestressed concrete beams with unbonded tendons
… sections with different amounts of prestressed and non-prestressed reinforcement, were tested under short-term and sustained loading and a combination of sustained loading with intermittent short-term cyclic loading(combined loading). Two additional ordinary reinforced concrete beams …
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Mature students' perception of stress on returning to learn
… model for mature students' perception of stress. The study examines the sources of institutional, dispositional and situational stress of students who are age thirty-to fifty-five. The research involved mature students in England (Yorkshire) and the United States of America (Minnesota). …
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The experience of co-morbidity: an interpretative phenomenological analysis: living with chronic pain and traumatic stress
… of living with chronic pain and traumatic stress. In addition existing research has focused on the relationship between chronic pain and post-traumatic stress disorder (PTSD) but has not considered the impact of complex post-traumatic stress disorder (CTPSD) on co-existing chronic pain. The …
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Remote Sensing of 21st Century Water Stress for Hazard Monitoring in California
… deformation of aquifer systems. These mass changes can disturb the regional stress field, which may influence earthquake activity. Both the elastic and poroelastic deformation responses can be observed using satellite-based geodetic tools including Global Navigation Satellite System (GNSS) …
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An Analysis of Focal Parameters with Application to West Texas Micro-Earthquakes
… focal mechanisms agree with current tectonic stress in west Texas, the distribution and focal mechanisms of the micro-earthquakes suggest local stress change might be the cause to trigger existing faults. Analyzing two relatively large events with the injection history indicates they are …
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Fully Coupled Finite Element Model to Study Multiple Hydraulic Fracturing in Heterogeneous Tight Formations
… magnitude and rate of fracture propagation would change significantly. Slip-tendency analysis performed clearly show the possible fault reactivation zones are around edge fractures tips. This study provides us understanding of multiple hydraulic fracturing investigating fracture geometry and …
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MicroCantilever (MC) based nanomechanical sensor for detection of molecular interactions
… to investigate the mechanism governing surface stress generation associated with chemical or molecular binding on functionalized microcantilevers. Formation of affinity complexes on cantilever surfaces leads to charge redistribution, configurational change and steric hindrance between …
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Earthquakes in complex fault settings: Examples from the Oregon Cascades, Eastern California Shear Zone, and San Andreas fault
… rupture scaling relationships to conduct Coulomb stress change modeling for the most recent earthquake on the Calico fault system. We find that the most recent event places regions adjacent to the fault in a stress shadow and may have both delayed the historic Landers and Hector Mine ruptures and …
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Crustal stress variability across spatial scales - examples from Canada, Northern Switzerland and a South African gold mine
The quantitative descriptions of the state of stress in the Earth’s crust, and spatial-temporal stress changes are of great importance in terms of scientific questions as well as applied geotechnical issues. Human activities in the underground (boreholes, tunnels, caverns, reservoir management, …
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Modelling the impact of total stress changes on groundwater flow
… FEMWATER code to investigate the impact of total stress changes on groundwater flow in the vicinity of a salt tailings pile. Total stress and pore-pressure data observed at the Lanigan and Rocanville potash-mine sites were used to assist the development of a generic FEMWATER model. The original …
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Improving statistical seismicity models
… earthquake triggering process, including static stress interactions and dynamic stress transfer. Significant differences of these mechanisms are particularly expected in the spatial distribution of aftershocks. However, testing the different hypotheses is challenging because it requires the …
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