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 76 for “"surface processes"”.
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Optical measurement of deformation fields and surface processes with digital speckle correlation
… of three-dimensional deformation fields and surface processes, i.e. changes in the microstructure of the surface. The method is based on a detailed analysis of the changes in the speckle field that is scattered from a laser-illuminated rough surface, using digital image processing. The …
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Satellite and lagrangian observations of mesoscale surface processes in the southwestern Atlantic Ocean
This work presents a study of the mesoscale surface processes occurring in the Southwestern Atlantic Ocean. Two regions in this ocean, the Brazil-Malvinas (Falkland) Confluence (BMC) Zone and the South Brazilian Continental Shelf (SBCS) are studied by means of a 14 year long series of low …
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Atomic-level investigation of surface processes governing SiGe wetting layer formation using STM/STS
… along all equivalent <130> directions of the surface, giving rise to a zigzagged morphology. ADCSs exhibit localized movements, wherein their rearrangements are strongly coupled with the structure of the underlying substrate dimers. At elevated temperatures, ADCSs are observed to transition to …
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Modeling land surface processes of the midwestern United States : predicting soil moisture under a warmer climate
… IBIS has several key advantages over the native surface physics scheme used in RegCM3, Biosphere-Atmosphere Transfer Scheme 1e (BATS1e), most notably superior subsurface hydrology and partitioning of runoff. A series of 22-year numerical experiments were completed to evaluate the ability of …
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SAR interferometry analysis of surface processes in the Pamir – Tien Shan active orogens - emphasis on coseismic deformation and landslides
… to tectonically active systems and related surface deformation. With 3 publications two case studies are presented: (1) The coseismic deformation related to the Nura earthquake (5th October 2008, magnitude Mw 6.6) at the eastern termination of the intramontane Alai valley. Located between …
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Materials and Surface Processes at Gale Crater and the Moons of Mars Derived from High Spatial and Spectral Resolution Orbital Datasets
<p>This thesis is a collection of studies that use orbital remote sensing data to investigate the composition and geologic histories of Mars' moons, Phobos and Deimos, and Mt. Sharp, the destination for the Curiosity Mars rover. A final chapter focuses on Curiosity data and terrestrial analog …
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Modeling of gallium nitride molecular beam epitaxy growth
… approach is proposed based on physically sound surface processes to investigate the molecular beam epitaxy growth of GaN using ammonia and ECR plasma source. A surface riding layer of Ga and ammonia or N plasma species are included in the model. The surface riding species are allowed to undergo …
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Theoretical study of the molecular processes occurring during the growth of Silicon on Si(100) and SixGe1-x/Si(100)
… attempt to elucidate the mechanisms of several surface processes. The focus of this work was on the processes occurring on the surface of pure, strained silicon(100)-2??1 as well as silicon-germanium during the growth of silicon by gas-source molecular beam epitaxy (GSMBE). First-principles …
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Télédétection micro-onde de surfaces enneigées en milieu arctique : étude des processus de surface de la calotte glaciaire Barnes, Nunavut, Canada
… sea level rise, a better characterisation of the surface processes such as the evolution of the surface mass balance is needed. This knowledge is currently very limited, mainly due to the sparse covering of automatic weather stations or in-situ measurements over the Arctic. Furthermore, several …
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A comprehensive global 3D model of delta-18O in atmospheric CO2
… gross fluxes of the terrestrial biosphere. Model surface processes have been validated against regional experiments while the integrated atmospheric signal has been investigated comparing with global atmospheric observations. Modelled surface processes compare well with observed data over the …
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Hydrogen Transport in and Through Niobium
… to understand the roles of bulk diffusion and surface processes in hydrogen transport in and through niobium. Bulk hydrogen and deuterium diffusivities and permeabilities were measured at high temperatures (700 - 1400 K) using diffusion controlled permeation methods. At lower temperatures, …
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Theoretical study of MBE growth of indium gallium arsenide semiconductor compound on gallium arsenide substrate
… perfection is intrinsically controlled by the surface segregation of In due to its larger atomic size compared to Ga. In this work, a rate equation model is developed including several surface processes such as segregation from the crystalline layer to a surface riding In segregated layer and …
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Stratigraphic response to Cordilleran processes along the south central Andean margin
… building, magmatism, lithospheric dynamics, surface processes, and climate-carbon cycles. Resolving the feedbacks and relationships among these components has been a longstanding challenge in Earth science with broad implications for understanding coupling among rheology, deformation, and …
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Modification of magnetic properties in granite during hydrothermal alteration (EPS-1 borehole, Upper Rhine Graben)
… two stages. Stage I alteration is related to processes during magma cooling and solidification of the plutonic body in Middle Carboniferous times. Stage II alteration is associated with post-emplacement tectonics from Late Carboniferous to Permo-Triassic, such as exhumation of the plutonic …
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Vertical Structure And Surface Interactions Of Nitrous Acid Using A 1D Model
… in order to study the vertical distribution and surface interactions of gas-phase HONO under non-ideal mixing conditions during the 2011 NACHTT campaign using the Platform for Atmospheric Chemistry and vertical Transport in One Dimension (PACT-1D) model. This work builds on a previous 0D …
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A quantitative approach to the evolution of the central Walvis Basin offshore NW-Namibia : structure, mass balancing, and hydrocarbon potential
… approach towards a quantitative link between surface processes and internal processes in terms of a mass and process balance.
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Permeation studies of hydrogen, deuterium and helium in aluminium, gold molybdenum and silver: the influence of phase boundary processes
… discharge and ion beam injection at the input surface. Measurements consisted of the response time of pressure, across a metal membrane, in the detection chamber due to fluctuations at the input. The downstream vacuum chamber was continuously pumped. The relationship between the time-lag of the …
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The Phase Behavior of Heavy Oil and Propane Mixtures
… results can be used in the design of in situ and surface processes involving the addition of propane to bitumen.
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Denudation processes in a tectonically active rift on different time scales
… or geothermal systems. The study of extensional processes and the factors that further modify the mainly climate-driven surface process regime helps to identify changes in past and present tectonic and geomorphic processes that are ultimately recorded in rift landscapes. The Cenozoic East African …
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