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 243 for “"vent"”.
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Larval dispersal between hydrothermal vent habitats
Hydrothermal vents are isolated, short-term habitats that support unique biotic assemblages with relatively high biomass utilizing an unusual energy source. How these communities establish themselves and maintain species identity despite their isolation and impermanence is a significant question in …
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Larval dispersal between hydrothermal vent habitats
Thesis (Ph. D.)--Massachusetts Institute of Technology, Dept. of Biology, 1996.
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Degassing Behaviour of Basaltic Open Vent Volcanoes
… until the next explosive slug-bursting event. The second problem explores the turbulent structures of volcanic plumes. I show that it is possible to estimate volcanic water vapour fluxes with the combination of the measurement of convective structures in plumes and classical plume theory. …
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Automated planning for hydrothermal vent prospecting using AUVs
… of searching the ocean floor for hydrothermal vents, using autonomous underwater vehicles (AUVs). This is a hard problem because the AUV's sensors cannot directly measure the range or bearing to vents, but instead detecting the plume from a vent indicates the source vent lies somewhere …
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Fluid flow and sound generation at hydrothermal vent fields
… measure and monitor fluid flow from hydrothermal vent fields. Simultaneous velocity, temperature, and conductivity data were collected in the convective flow emanating from a hydrothermal vent field located at 10°S6'N, 103° 41'W on the East Pacific rise. The horizontal profiles obtained indicate …
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Fluid flow and sound generation at hydrothermal vent fields
Thesis (Ph. D.)--Joint Program in Oceanography (Massachusetts Institute of Technology, Dept. of Earth, Atmospheric, and Planetary Sciences; and the Woods Hole Oceanographic Institution), 1988.
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Near-vent processes of the 273 ka Poris eruption (Tenerife)
Near-vent processes during caldera-forming explosive eruptions are poorly known, as are relations between proximal and counterpart distal ignimbrites. Consequently, understanding of the full course of these eruptions and how to analyse their deposits for purposes of hazard assessment has been …
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Convection from laser-scanned ice roughness at multiple accretion vent times.
Ice accretions degrade aircraft flight safety and performance by decreasing the lift and stall angle, increasing the drag, and increasing the aircraft weight. A recent study found that the commonly used realistic ice roughness models did not replicate the convective heat transfer results of one …
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Geochemistry of hydrothermal vent fluids from the northern Juan de Fuca Ridge
… a range of chemical processes in hydrothermal vent environments. For example, hydrothermal alteration experiments indicate that alteration of organic-rich sediments leads to up to an order of magnitude more metals in solution than alteration of organic-poor basalt. This result is in contrast to …
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Geochemistry of hydrothermal vent fluids from the northern Juan De Fuca Ridge
… a range of chemical processes in hydrothermal vent environments. For example, hydrothermal alteration experiments indicate that alteration of organic-rich sediments leads to up to an order of magnitude more metals in solution than alteration of organic-poor basalt. This result is in contrast to …
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Méthodes avancées d'évaluation des charges de vent sur les structures de concentrateurs solaires
… prometteuse aux structures solaires conventionnelles. Ce type de structure modulable doit être optimisé afin d’être compétitif par rapport aux autres types de production d’énergie. Les forces de vent demeurent la première préoccupation dans la conception de la structure porteuse en acier …
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The geochemistry of boron and lithium in mid -ocean ridge hydrothermal vent fluids
<p>Examining the chemistry of hydrothermal vent fluids can provide insight into processes occurring below the seafloor along the mid-ocean ridge axis. Boron and lithium in hydrothermal vent fluids were studied because previous results indicated that these elements might be useful tracers of …
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Design and Implementation of a Pressure-Equalizing Vent System for Low-Slope Roofs
… The object of this study is the design of a wind vent which, when coupled with a single-ply roof membrane in a complete roof assembly, will successfully equalize low pressure throughout the entire field of the roof. The proposed wind vent differs from existing equalizer valves in its use of the …
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Vertical distributions of megafauna on inactive vent sulfide features correspond to their feeding modes
The discovery of inactive hydrothermal vent sulfide features located off the ridge axis in the 9°50'N region of the East Pacific Rise provides an opportunity to investigate knowledge gaps in the distribution and feeding ecology of communities inhabiting this type of deep-sea habitat. Previous …
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Vertical distributions of megafauna on inactive vent sulfide features correspond to their feeding modes
The discovery of inactive hydrothermal vent sulfide features located off the ridge axis in the 9°50'N region of the East Pacific Rise provides an opportunity to investigate knowledge gaps in the distribution and feeding ecology of communities inhabiting this type of deep-sea habitat. Previous …
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Geochemistry of deep-sea hydrothermal vent fluids from the Mid-Cayman Rise, Caribbean Sea
… species distributions in hydrothermal fluids venting at Von Damm and Piccard, two vent fields at the ultraslow spreading Mid-Cayman Rise, Earth’s deepest mid-ocean ridge. In Chapter 2, abiotic organic synthesis is shown to occur via two distinct mechanisms in the serpentinizing Von Damm …
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Stochastic mapping for chemical plume source localization with application to autonomous hydrothermal vent discovery
… explosive ordinance removal, and hydrothermal vent prospecting. Turbulent flows make the spatial relationship between the detectable manifestation of a chemical plume source, the plume itself, and the location of its source inherently uncertain. Search domains with multiple sources compound …
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DEVELOPMENT AND VALIDATION OF AN ANALYTICAL CHARGE-HOLD-VENT MODEL FOR CRYOGENIC TANK CHILLDOWN
A transient Charge-Hold-Vent (CHV) analytical model has been developed and validatedwith hydrogen experimental CHV data. The model was found to be within 7% agreementof the data. The model simulates natural convection and jet impingement heat transferinteractions using quasi-unsteady steps in time …
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Quantification of Permeability-Porosity Relationships in Seafloor Vent Deposits: Dependence on Pore Evolution Processes
… within the seafloor and are emitted through vent deposits, formed from interaction between vent fluids and seawater. These deposits evolve as they react physically and chemically with venting fluids and seawater, therefore changing transport properties, such as permeability and porosity. In …
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Stochastic mapping for chemical plume source localization with application to autonomous hydrothermal vent discovery
… explosive ordinance removal, and hydrothermal vent prospecting. Turbulent flows make the spatial relationship between the detectable manifestation of a chemical plume source, the plume itself, and the location of its source inherently uncertain. Search domains with multiple sources compound …
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