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 100 for “"sill"”.
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Linking sill morphology to emplacement mechanisms
Mafic sill complexes are increasingly being shown to play a major role in the movement of magma around the upper crust in volcanic terranes and to have a role in mass extinction events in Earth history. Most of the current models of sill emplacement assume that brittle fracture operates at all …
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Sill Overflow Processes in the Philippine Archipelago
… scale processes associated with bathymetric sills in the Philippine Archipelago, with an emphasis on in situ observations made during the 2007-2009 Philippines Straits Dynamics Experiment (PhilEx). Due to their location at the margins of larger basins, the dynamics at these sills set the …
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The dynamics of unsteady strait and sill flow
… the influence of deep ocean straits and sills on the abyssal circulation. Three types of channel flow are considered: nonrotating one dimensional (Chapter 2); semigeostrophic, constant potential vorticity (Chapter 3); and dispersive, zero potential vorticity (Chapter 4). In each case the …
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Sub-Maximal Exchange Flow over a Sill with Barotropic Forcing
… on a sub-maximal exchange flow. A strait with a sill is simulated numerically, using a two layer hydrostatic approximation. Time-averaged exchange flow increases with tidal amplitude depending on three factors: the physical dimensions of the problem, the tidal amplitude, and the relative strength …
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Dike-Driven Hydrothermal Processes on Mars and Sill Emplacement on Europa
… On the icy moon Europa, I modeled a proposed sill emplacement mechanism using a finite element code and found that water could flow up through an approximately 10 km thick ice shell without freezing. The analysis also found that shallow cracks in the ice combined with deep cracks cause a …
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Assessment of strategy inventory of language learning (sill) in students learning a second language
… of the Strategy Inventory for Language Learning (SILL), version 5.1 for native English speakers learning a second language. This thesis evaluates the usefulness of the SILL at predicting LLS usage and second language performance. It also provides statistical analyses of the SILL to evaluate …
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The effects of fault-induced stress anisotropy on fracturing, folding and sill emplacement: Insights from the Bowie coal mines, southern Piceance basin, western Colorado.
… folds, including a footwall fold. Igneous sills in three Bowie coal seams show strong preference for fault zones. The recognition of similar fracture trends in other mining or exploration areas is a valuable tool that may significantly reduce economic or human cost by helping to mitigate …
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Order and chaos in the olivine underworld: two mechanisms for the formation of basal olivine layers
… to the result of in-situ differentiation. Two sills with basal olivine layers, the 0601 sill, Victoria Island, NWT, Canada, and the Palisades Sill, Fort Lee, NJ have been examined in detail. First, it can be shown that the 0601 sill could have formed by the emplacement of a single phenocryst …
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Metamorphoseentwicklung im Kaokogürtel, NW-Namibia
… Granat-Zone, Staurolith-Zone, Disthen-Zone, ky-sill-mu-Zone, sill-mu-Zone, sill-ksp-Zone, g-cd-sill-ksp-Zone. Mit Hilfe geothermobarometrischer und moderner phasenpetrologischer Methoden (z.B. P-T- Pseudoschnitte) wurden die P-T-Bedingungen ermittelt, die die Metapelite während ihrer …
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Hydrographic structure of overflow water passing through the Denmark Strait
… of the different DSOW constituents at the sill before the water descends into the Irminger Sea using temperature and salinity (T/S) data from 111 shipboard crossings in the vicinity of the sill, collected between 1990 and 2012. The individual realizations indicate that weakly stratified …
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Hydrographic structure of overflow water passing through the Denmark Strait
… of the different DSOW constituents at the sill before the water descends into the Irminger Sea using temperature and salinity (T/S) data from 111 shipboard crossings in the vicinity of the sill, collected between 1990 and 2012. The individual realizations indicate that weakly stratified …
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Seismic constraints on the processes and consequences of secondary igneous evolution of Pacific oceanic lithosphere
… endeavor to advance our understanding of sill-driven alteration of sediments, an important consequence of secondary magmatism. We show that seismically imaged physical disruption to sediments due to igneous sill intrusion can be related to changes in sediment physical properties that …
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Seismic constraints on the processes and consequences of secondary igneous evolution of Pacific oceanic lithosphere
… endeavor to advance our understanding of sill-driven alteration of sediments, an important consequence of secondary magmatism. We show that seismically imaged physical disruption to sediments due to igneous sill intrusion can be related to changes in sediment physical properties that …
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Polarized substructural session types
… of logically motivated session types, SILL. Polarization, classifying propositions as either positive or negative, provides a natural way to describe a logically based session typing language with asynchronous communication while retaining a semantics that is reasonably implementable. …
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Glacier-ocean interactions in shallow-silled fjords
Glacier-ocean interactions in shallow-silled fjords play a crucial role in the mass balance of marine-terminating glaciers and the transport of freshwater from the ice sheet to the ocean. Despite their importance, the complex dynamics of these systems, influenced by sill processes, freshwater …
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Spatial variability of soil biological and chemical indicators in selected soils in South Africa
… have strong spatial dependence with nugget to sill ratios of less than 25% in the field of University of Venda Experimental Farm. Thus, catalase, acid phosphatase and organic phosphorus exhibited moderate spatial dependence with nugget to sill ratios between 25 and 75%. All parameters were …
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The Impact of Teaching Explicit Listening Strategies to Adult Intermediate- and Advanced-Level ESL University Students
… the Strategies Inventory for Language Learning (SILL) (Oxford, 1990), researcher-designed post-intervention surveys, and a researcher-designed post-study survey. Investigated were four covariates: school attended, level of instruction, native language, and proficiency level. Data were analyzed …
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The influence of magma supply and eruptive processes on axial morphology, crustal construction and magma chambers
… in crustal thickness and temperature. Magma sill properties and hydrothermal activity are closely linked to spreading events which occur on much shorter time scales (ca. 10-100 yr) than the longer-term variations in magma supply reflected in along-axis changes in ridge morphology. The …
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Application of the finite element method in high-side gondola rail car design
… margin of safety. These areas are in the end sill to draftsill connection and in the draftsill casting. These conditions appear to be inconsequential since in the end sill case, the high stress is apparently caused by modeling constraints and the draftsill casting is a traditional design and …
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Advanced geophysical studies of accretion of oceanic lithosphere in Mid-Ocean Ridges characterized by contrasting tectono-magmatic settings
… I found that the axial magma chamber (AMC) melt sill is segmented into four prominent 2-4-km-long sections spaced every ~5- 10 km along the ridge axis characterized by high melt content (>95%). In contrast, within the intervening sections, the AMC sill has a lower melt content (41-46%). The total …
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