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 37 for “"High Temperature And Pressure"”.
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Glycerin reformation in high temperature and pressure water
… a 2³ experimental matrix was conducted, with temperatures of 500 and 700⁰C, water/glycerin molar ratios of 3:1 and 13:1, and residence times of 30 and 90 seconds, all at a pressure of 24 MPa. It was found that temperature had the largest effect on the two gasification parameters deemed most …
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A droplet evaporation model for high temperature and pressure spray applications
… droplet evaporation model, suitable for the high temperatures and high pressures encountered in diesel engines, has been developed, based on an extensive review of previous work on droplet evaporation. The new model includes the dependence of gas and liquid thermodynamic and transport …
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The mechanical behavior of faulted rock at high temperature and pressure.
… Institute of Technology. Dept. of Earth and Planetary Sciences.
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A study of fine coal dewatering by high temperature and pressure filtration
… reducing the fine coal moisture. Because of its high capital, operating costs, and safety hazards, an alternate method of moisture reduction is highly desirable in the coal industry. The major effort of this thesis was directed towards the development of a method to dewater fine coal by the …
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High Temperature And Pressure Resonant Ultrasound Spectroscopy Study Of Metal Hydride Systems
… using the resonant ultrasound spectroscopy. A high temperature and high pressure resonant ultrasound spectroscopy system which include the RUS cell and the direct contact transducer set-up was designed and constructed. The temperature and pressure dependent of elastic moduli of palladium …
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Laminar burning velocity of isooctane-air, methane-air, and methanol-air mixtures at high temperature and pressure
Thesis (M.S.)--Massachusetts Institute of Technology, Dept. of Mechanical Engineering, 1977.
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Material development and characterization for high salinity water for desalination by membrane distillation at high temperature and pressure
Ever increasing demand of water for different applications is creating more pressure on limited freshwater resources. In addition to domestic, public, and agricultural usage, industrial use of water is contributing to the water shortage. The use of non-traditional water resources for the energy …
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Facilitating, understanding, and controlling the oxygen reduction reaction for fuel cell technology using (1) laccase-inspired tricopper molecular catalysts, (2) a high temperature and pressure reaction vessel, and (3) a hybrid bilayer membrane electrochemical platform
… the ORR. Second, I evaluated the ORR kinetics at high temperature (between 100 and 200 °C) and under pressurized conditions (between 0.7 and 3.4 MPa). Third, I designed and prepared a hybrid bilayer membrane (HBM) electrochemical platform to control the ORR mechanism by modulating the proton flux.
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Pourbaix diagrams at elevated temperatures: a study of Zn and Sn
… such as power plants are often subjected to high temperature and pressure aqueous environments, where failure to control corrosion compromises worker and environment safety. For instance, zircaloy (1.2-1.7 wt.% Sn) fuel rods are exposed to aqueous 250-310 oC coolant in CANDU reactors. The …
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A fundamental study of model fuel conversion reactions in sub and supercritical water
… conditions were examined to improve our understanding of chemical transformations in this high temperature and pressure environment. Results have a direct impact on present and future hydrothermal fuel conversion research for a range of fossil-based and bio-mass based feed stocks. Methane was …
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Scratch tests : a new way of evaluating the fracture toughness of materials
This thesis develops, validates and implements a fracture mechanics model for the assessment of the fracture toughness of materials from scratch tests. Dimensional Analysis highlights two major processes at work during scratch tests: plastic yielding and fracture dissipation. An original set-up of …
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Droplet Drag Modeling on Spray Conditions
… to investigate the effect of droplet deformation and internal circulation on droplet dynamics. Although droplet drag is a classical area of study, there are still theoretical gaps in understanding the motion of large droplets. In applications such as spray combustion, droplets of various sizes are …
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Catalytic Mechanism and Maturation of the Metalloenzyme Nitrile Hydratase
… amides in a specific manner at ambient pressures and temperatures at neutral pH. Traditional industrial methods require high temperature and pressure, extreme pH, and heavy metals. NHases are used as biocatalysts in the large scale industrial production of amide precursors to textiles, …
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Spectroscopic measurements and modeling of carbonaceous particle combustion in a shock tube
… (CNP) combustion shapes optical signatures and heat release in detonation-relevant multiphase flows, yet quantitative constraints on particle temperature, sublimation rates, reaction kinetics, and wavelength-dependent optical properties remain limited under short-duration, high-temperature …
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Differential Protein Expression and Butanol Production using <i>Clostridium beijerinckii</i>
Current events demand new forms of renewable energy. Ethanol from fermentation has been the standard in biofuel for years, but not for long. It has become apparent that ethanol has serious drawbacks. Ethanol is more corrosive to engines and only has approximately 60% the energy content of gasoline …
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Experimental and finite element analysis of high pressure packer elements
… can operate under specified downhole conditions and provide a seal for either a short-term, retrievable, or a long-term, permanent, completion. In this case a retrievable 19.7cm (7-3/4") packer element for a high-pressure high-temperature (HPHT) environment was designed and tested. The element …
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Homogeneous equilibria in hydrothermal fluids at near critical conditions.
… homogeneous equilibria as a function of temperature and pressure is the best way to determine ion activities at elevated pressure-temperature conditions. Activities of most cations decrease with increasing temperature, but the activity of the hydrogen ion may either increase or decrease. …
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Combustion Kinetics of Advanced Biofuels
… from combustion. Ketones are a class of biofuel candidates which are produced from cellulose. However, ketones received rather scarce attention from the combustion community compared to other classes such as, alcohols, esters, and ethers. There is little knowledge on their combustion performance …
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Temperature And Pressure Effects On Elastic Properties Of Relaxor Ferroelectrics And Thermoelectrics: A Resonant Ultrasound Spectroscopy Study
… of structural phase transitions with changes in temperature and the chemical composition. The work covered in this dissertation seek to gain insight into the phase diagram of PMN-PT using temperature and pressure dependence of the elastic properties. Single crystal PMN-PT with a composition near …
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Novel Technology for Crystal Engineering of Pharmaceutical Solids
… engineering of active pharmaceutical ingredients and excipients was developed. The present novel technology MASCW process is described as green technology as water is used as the solvent medium and microwave energy as external source of heat energy for generation of a particle with different …
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