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 “"Surface Cooling"”.
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Progress towards high precision measurements on ultracold metastable hydrogen and trapping deuterium
… not achieve deuterium trapping through helium-surface cooling. It is proposed that buffer gas loading can be used to cryogenically cool and trap deuterium.
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Tomographic observations of deep convection and the thermal evolution of the Greenland Sea Gyre, 1988-1989
… phase (November-January), during which surface salinity is increased by brine rejection from ice formation and by entrainment but in which the mixed-layer deepens only slowly to a depth of some 150-200m, a deep mixing phase (February-March) during which the surface mixed-layer deepens …
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Experimental Study of the Effect of Dilution Jets on Film Cooling Flow in a Gas Turbine Combustor
Cooling combustor chambers for gas turbine engines is challenging because of the complex flow fields inherent to this engine component. This complexity, in part, arises from the interaction of high momentum dilution jets required to mix the fuel with effusion film cooling jets that are intended to …
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Energy Dissipation and Entropy Generation During the Fatigue Degradation: Application to Health Monitoring of Composites
… of three degradation stages. The effect of the surface cooling on the fatigue life of the laminates is investigated both experimentally and analytically. The results show that the life of the laminate is highly dependent on the temperature and that surface cooling can significantly increase the …
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Key mechanisms of surface water pCO2 variability in the North Atlantic Ocean
… gyre circulation has been developed, using sea-surface height from altimetry. In conjunction with the winter North Atlantic Oscillation (NAO) index, statistical analysis has been applied to understand the key mechanisms of surface water partial pressure of CO2 (pCO2) variability, both on the …
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Latent heat fluxes through nano-engineered porous materials
… vapor through truss voids (pores) cools surfaces covered by the barriers, suggesting the possibility for simultaneous protection of humans from mechanical and thermal stresses. Design of real systems employing this technique requires quantitative understanding of vapor transport within …
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Atmospheric circulation and the surface mass balance in a regional climate model of Antarctica
… of radiative energy deficit and atmospheric cooling. An assessment of regional climate model HIRHAM is presented. The simulations are generated with the HIRHAM model, which is modified for Antarctic applications. With a horizontal resolution of 55km, the model has been run for the period …
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Cooling and internal waves on the Continental Shelf
… evolution of a coastal ocean undergoing uniform surface heat loss is examined. The dynamics of this ocean are initially modulated by the intense vertical mixing driven by surface cooling. The strong vertical mixing prevents the formation of geostrophic flows and inhibits the cross-shelf flux of …
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A numerical model of mixing and convection driven by surface buoyancy flux
… basin driven by a specified heat flux at the surface. A numerical model is constructed for this purpose. The main focus of the study is on the density and circulation structure resulting from the thermal forcing. In chapter two, a simple vertical one-dimensional model is developed to examine …
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LUCAS - Lund University Cardiopulmonary Assist System
… CPP than manual CPR. LUCAS-CPR combined with surface cooling to 34°C was superior to normothermic LUCAS-CPR during 1 hour of CPR for ventricular fibrillation. Defibrillation was more effective to obtain ROSC after prolonged ventricular fibrillation if chest compressions were done before the …
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The influence of volcanic stratospheric aerosols on interannual global climate variations
… wind strength and corresponding increase in sea surface temperatures (SST) in the eastern tropical Pacific Ocean. The observational evidence for an association between the record of volcanic eruptions and SST and the Southern Oscillation Index (SOI, Tahiti SLP minus Darwin SLP) over the last 120 …
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Cross-shelf circulation and momentum and heat balances over the inner continental shelf near Martha's Vineyard, Massachusetts
… temperature, density, and bottom pressure; surface gravity waves; wind stress; and heat flux between the ocean and atmosphere during 2001-2007. When waves are small, cross-shelf wind stress is the dominant mechanism driving cross-shelf circulation. The along-shelf wind stress does not drive …
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Effects of thermal stimuli during simulated hemorrhaging on aspects of cognitive performance
… skin temperature (Tsk): 36.7 ± 0.5°C), skin surface cooling (Tsk: 29.6 ± 1.0°C), or remained thermoneutral (Tsk: 33.5 ± 0.6°C) for an additional 40 min via a water-perfused suit. A modified Erikson Flanker task was used as a measure of cognitive function. Affective valence and thermal …
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Cross-shelf circulation and momentum and heat balances over the inner continental shelf near Martha's Vineyard, Massachusetts
… temperature, density, and bottom pressure; surface gravity waves; wind stress; and heat flux between the ocean and atmosphere during 2001-2007. When waves are small, cross-shelf wind stress is the dominant mechanism driving cross-shelf circulation. The along-shelf wind stress does not drive …
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Airborne lidar observations of tropospheric arctic clouds
… forcing, amounting to -0.4 W m-2. This slight surface cooling is negligible on a local scale. However, thin Arctic clouds have been reported more frequently in winter time, when the clouds' effect on longwave radiation (a surface warming of 2.8 W m-2) is not balanced by the reduced shortwave …
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Stratified and stirred: Monsoon freshwater in the Bay of Bengal
… can play a critical role in setting the ocean’s surface boundary layer thickness and associated density stratification. Submesoscale instabilities contribute to lateral stirring and tracer dispersal. These dynamics are investigated in the Bay of Bengal, motivated by the upper ocean’s potentially …
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A Coupled Bio-Optical and Mixed Layer Model for the Equatorial Pacific
… the chlorophyll a maximum concentration from the surface to 150 meters and variation in the chlorophyll a specific phytoplankton absorption spectrum. Additional simulations were used to investigate the role of phytoplankton induced turbidity on the mixed layer for ENSO (warm SST) and Non-ENSO …
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Computational and Experimental Investigation of Supersonic Convection over a Laser Heated Target
… a function of time for a given target geometry, surface radiation intensity and free stream flow condition. The effect of a turbulent supersonic flow was investigated both numerically and experimentally. Experiments were in the Virginia Tech supersonic wind tunnel with a Mach 4 nozzle, ambient …
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The dynamics of mean circulation on the continental shelf
… circulations driven by coastal buoyancy flux and surface cooling are investigated. In the mid-shelf region, away from the coast and the shelf break, the density field is governed by Burgers' equation, which shows longshore self-advection of density perturbations and the formation of front with …
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Modelling turbulence and transport of buoyant material in the ocean surface mixed layer
… and three-dimensional Lagrangian particles. Surface cooling drives convection, and under this regime persistent convective vortices form which trap and accumulate buoyant particles. We test the resilience of convective vortices under the additional presence of wind, and find that in weak …
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