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 49 for “"Reduced-Pressure"”.
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Bubble growth rates at reduced pressure.
Thesis (Sc. D.)--Massachusetts Institute of Technology, Dept. of Mechanical Engineering, 1969.
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Reactions between refactories and steel melts under reduced pressure.
Abstract not available.
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Laboratory Test Program of Rotary Plate Sprinklers
… of these sprinkler systems are equipped with reduced pressure sprinkler heads, about 50% in South Dakota as an example. The reduced pressure sprinkler heads were introduced into the market in response to increasing energy costs during the 1970's. These designs tend to produce small application …
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Determination of metal quality of aluminium and its alloys
… to hydrogen in pores in cast Al alloys. The Reduced Pressure Test (RPT) is used which is a simple and widely known test, is cost effective and involves no complicated equipment or consumables, thus recommending it for implementation on the foundry floor. On this basis, several Al-Si based …
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Enhanced Electrospray Ionization for Mass Spectrometry and Ion Mobility Spectrometry
… to vacuum in the MS. A series of atmospheric pressure ion focusing interfaces were designed and implemented to enhance the performance of ESI-MS. The technical objective of this work was to improve sensitivity and detection limits of ESI-MS using a combination of concentric high velocity …
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Estudos bibliográficos do gênero Pavonia e fitoquímico de Pavonia malacophylla (Link & Otto) Garcke - Malvaceae.
… crude ethanolic extract. This was filtered under reduced pressure, using silica gel 60 as fixed phase and hexane, ethyl acetate and pure methanol or in binary mixtures, in increasing order of polarity, as mobile phase. This was filtered under reduced pressure, using silica gel 60 as fixed phase …
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Bacon Production: Evaluating Potential Processing and Management Practices to Improve Product Quality of Industrial Sliced Bacon
… chilling cooked bellies, extended dwell time, reduced pressure injection, and tumble curing were identified as possibilities to reduce slicing defects. Brine chilling and extended dwell showed the greatest impact on slicing yields, with both reduced pressure and tumbled bellies having lower …
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Thermal properties of advanced aerogel insulation
… conductivity drops significantly with slightly reduced pressure (3.2 mW/m K at 0.1atm). For the final composite insulation, the new silica aerogel formula is a great choice and it is recommended to reduce the pressure around the aerogel to 1 / 1 0 th. In the future, a prototype of an insulation …
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Thermal and Hydraulic Characterization of Hook-Shaped Fins and Dimples
… quantifies the heat transfer coefficient and pressure drop of GRIPMetal arrays – hook-shaped fins with dimples – under varying tip clearances and attack angles. Experiments with water-cooled GRIPMetal surfaces explored Reynolds numbers (Re) from 600 to 12,000, while simulations examined attack …
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Development, testing, and evaluation of the central-flow, double- leaflet heart valve
… valve with the potential benefits of reduced pressure drop, turbulence, hemolysis, and thromboembolism could be a significant contribution. A central-flow, double-leaflet valve was developed. The wear, pressure drop, turbulence, and regurgitation associated with the new valve were …
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The synthesis of some new aromatic polycyclic hydrocarbons
… anthracene which on distillation under reduced pressure gave 11-(1-naphthyl)-5,6,8,9-tetrahydrobenz[a]anthracene and on aromatization yielded 11-(1-naphthyl)benz[a]-anthracene. When 1-naphthyl magnesium bromide was allowed to react with the 11-keto-8,9,10,11-tetrahydrobenz[a]anthracene, …
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Lipase catalyzed transesterification of plant oils with dialkyl carbonates
… method is soxhlet reactive extraction under reduced pressure. Using palm kernels, the best temperature for soxhlet extraction was 60oC (consequently 360 mbar), solvent/seed ratio of 7.3 ml dimethyl carbonate/g seed and addition of 0.2% water to the solvent. Under this condition 55% (% w/w of …
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Investigation of Pin Fin Cooling Channels for Applications in Gas Turbines
… Reynolds number, the RK-E and QRK-E models match pressure coefficient data the closest. An investigation of a biomimicry pin channel created using the undulations observed on seal whiskers also showed improvements in heat transfer levels and reduced pressure drops across the channel. The …
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Hybrid organic-inorganic pervaporation membranes for desalination
… through a nonporous polymeric membrane under reduced pressure conditions. In desalination applications, pervaporation has the advantage of near 100% of salt rejection. The pervaporation of an aqueous salt solution can be regarded as separation of a pseudo-liquid mixture containing free water …
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Relative Permeability Experiments of Carbon Dioxide Displacing Brine and Their Implications for Carbon Sequestration
… of the multiphase flow properties of high-pressure CO 2 displacing brine in porous media. A laboratory-scale core flooding reactor has been built to measure flow properties at in situ pressures, salinities, and temperatures. The reported set of experiments was designed to measure CO 2 …
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Organic fouling in membrane capacitive deionization systems
… system. Fouling caused an increase in the system pressure as well as 10-15% declines in salt adsorption and charge efficiency, and a similar increase in desalination energy over 20 hours of operation. The pressure increased overall, but showed cyclical increases and decreases suggesting that …
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Legalising the illegal: an assessment of the Dispensation of Zimbabweans Project (DZP) and Zimbabwe Special Dispensation Permit (ZSP) regularisation projects
… order to achieve four main objectives: to reduce pressure on the asylum management system, to curb the deportation of illegal Zimbabwean migrants, to regularise Zimbabweans who were residing in SA illegally and to provide amnesty to Zimbabweans who had obtained South African documents …
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Molecular dynamics and self-diffusion in supercritical water
… measurements at high temperatures and high pressures. Computer simulation is one of the best tools to predict and analyze the properties which are difficult to be experimentally obtained. The goals of this research is to gain a better understanding as to self-diffusivity of SCW, of which …
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The chemistry of metalorganic chemical vapor deposition from a copper alkoxide precursor
… relate it to deposited film composition. In a reduced pressure helium atmosphere, copper dimethylaminoethoxide deposits clean, conductive films of copper metal at 200°C. The ligands are eliminated by two interdependent reactions: β-hydride elimination produces dimethylaminoethanol, while …
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Enhanced Extended-Surfaces for Two-Phase Pump-Less Cooling Loops
… laminate-enhanced extended surfaces in water at reduced pressures. A lamination of fine-filament, wire mesh is an effective surface enhancement for boiling since the surface can be configured to provide a very high density of potential bubble nucleation sites. A coating of copper fine wire screen …
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