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.
Results
Showing 1 to 20 of 20 for “"vertical extent"”.
-
Characterising the response of the mixed and the transitional layers to the passage of storms in the Sub-Antarctic Zone
… (SO) and have been shown to drive substantial vertical mixing, leaving behind wakes of perturbed upper ocean. The vertical extent and duration of the impact of these storms on the upper ocean remains unknown in this region, partly due to lack of observations in this remote part of the world. …
-
Kinetic Roughening During Hot-Wire Chemical Vapor Deposition of Hydrogenated Amorphous Silicon
… are found to critically depend on both the vertical extent of roughness and the root-mean-squared slope of the surface.
-
Modal analysis of vertical array receptions for the Heard Island Feasibility Test
During the 1991 Heard Island Feasibility Test, a vertical hydrophone array deployed off Monterey, CA, recorded transmissions from a low-frequency acoustic source nearly 18,000 km away. By determining the modal structure of the received transmissions, it is possible to characterize the physics of …
-
The Mapkey: Preliminary Design, Construction and Testing of a Novel UAV Platform for Cavity Surveying
… collect a 3D point cloud as it flies along the vertical extent of an underground cavity. The potential benefits of this novel surveying method include: cost reduction, increased survey accuracy and reduced survey times. Autorotation is the state of flight where the main rotor rotates due to the …
-
The atmospheric boundary layer above the Agulhas current
… inversion was found which acts to limit the vertical development of cumulus clouds and therefore the redistribution of heat and moisture above the boundary layer. The results presented in this thesis are useful in two ways. The Agulhas Current has frequently been linked to South African …
-
Implications for gas hydrate occurrence : 3D thermobaric modelling of central Spitsbergen
… Python back-end allows for both laterally and vertically changing input parameters, is easily upgradable with both new functions and novel datasets, and provides a link to third-party tools while guaranteeing industry-standard support through Schlumberger's Petrel front-end. Although …
-
Mineral deposition in epithermal deposits formed through flash vaporization and implications for improved understanding of the Arista intermediate-sulfidation epithermal deposit in southern Mexico
… Deposition of high-grade ores over such a large vertical extent is inconsistent with models invoking that mineralization in the epithermal environment is formed by gentle boiling. The study of the Arista intermediate-sulfidation epithermal deposit demonstrated that vein formation at this prolific …
-
Applied math in geophysical fluids : partially trapped wave problems and mining plumes
… of non-uniform, realistic stratifications with vertical shear on forced compressible plumes. The plume model is developed to account for the influence of thermal conduction through the discharge pipe and an initial adjustment phase. We investigate the substantial role of compressibility, for …
-
Importance of boundary layer entrainment for surface fluxes over land
… be compared. This method evaluates the maximum vertical variance of the backscatter in order to identify backscatter features associated with the top of the PBL and helps to identify the vertical extent of turbulent mixing. This analysis sheds some light on the spatial heterogeneity of boundary …
-
Spatial and temporal evolution of fluids in hydrothermal ore deposits
Magmatic-hydrothermal systems typically have vertical extents of several hundred<br />meters and their geochemical characteristics (e.g. mineral assemblages) vary considerably<br />over that vertical extent. As a consequence the expression in outcrop varies depending on<br />the level of erosion. …
-
Development of the BASS rake acoustic current sensor : measuring velocity in the continental shelf wave bottom boundary layer
… core. For a wide range of shelf conditions, the vertical extent of the wave boundary layer does not exceed 2.5 cm and is commonly less. The extreme narrowness of this boundary layer is responsible for high levels of bottom stress and turbulent dissipation. Even in relatively mild sea states, the …
-
The geochemical evolution of saline groundwater within a fresh water aquifer south of Oakes, North Dakota
… wells were installed to determine the horizontal extent of the saline/brackish water. In order to determine the vertical extent of that water, and to determine groundwater movement, two detailed traverses of nested piezometers were installed.</p><p>Interpretation of hydraulic head data for the two …
-
Stratigraphy and paleontology of the upper Cretaceous Morden Member (Vermilion River Formation) in the outcrop area, northeastern North Dakota
… to be essentially uniform throughout the vertical extent of the Morden Member.</p> <p>Thirty-six species of benthonic foraminiferids and three species of planktonic foraminiferids were collected from 48 outcrop and 17 well cutting samples. The dominant species are rotaliines whereas the …
-
Near-bed hydrodynamics and sediment transport in the swash zone
… at 1 mm resolution by multiplexing through a vertical array of 32 plate electrodes. The relationship between conductivity and sediment concentration was calibrated during lab experiments with known masses of sediment neutrally suspended in a heavy liquid. The horizontal and vertical extent of …
-
Spatial and Temporal Variations in Composition and P-T Conditions of Ore-Forming Fluids Along Structures Controlling Unconformity-Related Uranium Deposits in the Athatbasca Basin, Saskatchewan
… over ~31 km strike length and up to ~900 m vertical extent in the PLC and ~4.3 km strike length of the P2 fault. Coexistence of liquid-dominated, vapor-dominated, and vapor-only fluid inclusions in fluid inclusion assemblages indicate that fluid boiling, which is interpreted to be related to …
-
Timescales of processes controlling water vapour entry to the stratosphere
… similar temporal variability but also affects vertical attenuation of concentrations in the stratosphere. Expanding on earlier studies, the impact of sub-seasonal temperature variability on stratospheric water vapour is quantified in reanalysis and in one global climate model where it is found …
-
The role of high-latitude oceans in transient climate change
… (CRFs). We show that the strength and the vertical extent of the time-mean Atlantic Meridional Overturning Circulation (AMOC) set the effective heat capacity of the World Ocean and affect the global CRF to greenhouse gas (GHG) forcing. A large fraction of the anomalous surface heat uptake …
-
Geology, mineralogy and geochemistry of the Cerro Matoso nickeliferous laterite, Córdoba, Colombia
… in weakly serpentinized peridotite both in vertical extent and in the degree of enrichment of nickel-rich secondary products than in strongly serpentinized peridotite. The Cerro Matoso peridotite was affected by two major tectonic events. Compressional stresses associated with the late …
-
Geology, geochemistry, and genesis of the El Peñón epithermal Au-Ag deposit, northern Chile : characteristics of a bonanza-grade deposit and techniques for exploration
… Colorada vein has a strike length of ~2 km, vertical extent of ~500 m (1377-1877 m asl), and varies in width from 0.5 m to 4.5 m. Pervasive supergene oxidation extends to 400 m below surface. Limited drill intercepts at deeper levels consist of banded and brecciated quartz, adularia, and …
-
On the structure and dynamics of the Asian monsoon anticyclone
The Asian summer monsoon circulation has been the subject of continuous research for several decades. Much emphasis has been given to the lower level cyclone, but while various models and mechanisms have been proposed to explain certain features of the upper level anticyclone, like the zonal scale …