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 20 for “"Atmospheric Pressures"”.
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Air Circulation Under Reduced Atmospheric Pressures
… sensors</p> <p>became non-linear at various pressures below 25 kPa. We introduced mathematical</p> <p>calibration corrections and found that sensor data linearity could be extended to a greater</p> <p>range of pressures. These calibration corrections allow for sensor calibration …
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Effect of operating variables on composition of overhead vapors and residue from a continuous flash distillation for the system methanol-water at atmospheric and sub-atmospheric pressures
Although distillation studies have been made for many types of rectifying columns under various conditions of operation, no systematic study has ever been made of the process that is the basis of rectification, e.g., flash distillation. It was the purpose of this investigation to study the action …
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Dissociation of carbon dioxide in an Al/Al2O3 microchannel plasma reactor at atmospheric pressure
… to other methods, even those operating at sub-atmospheric pressures, and is achieved here at atmospheric and even superatmospheric pressures. This is important because not only is CO2 problematic in terms of its environmental impact, but the primary product of dissociation, CO, is used as a …
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Analysis of Atmospheric Effects Due to Atmospheric Oxygen on a Wideband Digital Signal in the 60 Ghz Band
… the 60 GHz band. This band is plagued with high atmospheric absorption due to atmospheric oxygen, but has a lot of bandwidth, which makes it desirable for multi-media applications. Recently, research of wideband digital links within the 60 GHz band gained the interest of the wireless …
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Particle modeling of non-equilibrium field emission driven RF microplasmas
<p>Non-equilibrium microplasmas at atmospheric pressures have been investigated for active flow control, micropropulsion and electronic display applications to name a few. The operational voltages for these microplasmas are on the order of kilovolts. When the electric field at the electrodes …
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Design and Analysis of Nonthermal Plasma Electrolytic Cells for Ammonia Synthesis
… technology is able to cleanly produce ammonia at atmospheric pressures and ambient temperatures from just air and water without generating CO2 or harmful equivalents. This work developed two modular and portable designs for plasma-assisted ammonia synthesis and investigated their implementation on …
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Experimental and Numerical Study of Dual-Chamber Thermosyphon
… experiments were carried out using water at sub-atmospheric pressures of 9.7, 15 and 21 kPa with a three-dimensional porous boiling enhancement structure integrated in the evaporator. Sub-atmospheric pressure boiling achieved heat fluxes in excess of 100 W/cm2 with negligible incipience …
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Getting to the Point: Bridging the Gap between Simple and Complex Catalytic Systems using Temporal Analysis of Products (TAP)
… under process conditions, which means operating pressures of one atmosphere or higher. Under these conditions, it is difficult to extract intrinsic kinetic properties of the catalyst which are properties that are directly related to the catalyst structure and composition. To find these intrinsic …
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Analysis of an oscillating engine for power generation based on the "Drinking Bird Toy"
… between dry and wet bulb temperatures at near atmospheric pressures to complete the working cycle of the engine. The normal boiling point of Freon-11 is 75[degrees]F., about 5[degrees]F. below the assumed ambient air temperature. Dry and wet bulb temperatures at 80[degrees]F. and 65[degrees]F. …
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Gas-Phase Formation of Environmentally Persistent Free Radicals from Thermal Degradation of Catechol, Hydroquinone, Phenols and Tobacco
… can live long enough mostly when associated with atmospheric fine particles to induce the biological damages reported in the literature. Thus identification of the exact nature of the free radicals, their origin, the reason for their stability and persistency, and their health impacts appear to be …
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Liposome-Mediated DNA Transfer
… cell (ESD3) cell lines were placed under various pressures in a hydraulic pressure bomb chamber. The effective dose that killed half of the cells (ED50) for viability of the CHO, PK1 and ESD3 cell lines were 25,607 +/- 1005, 26,869 +/- 4252, and 15,436 +/- 210 pounds per square inch (psi), …
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Phase equilibrium studies at normal pressures
… equilibrium data on binary mixtures at atmospheric and sub-atmospheric pressures. The method gives isothermal data which can be obtained rapidly. Only measurements of total pressure are made as a direct function of composition of synthetic liquid phase composition, the vapour phase …
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Development Of A Field-Portable Miniature Mass Spectrometer Designed For In-Situ Analysis And Ion Trap Miniaturization
… the aforementioned compounds can be completed at atmospheric pressures and in the presence of complex matrices and sample surfaces when used in conjunction with ambient ionization sources. The work contained in this thesis is a summary of investigations that touch on different themes which further …
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Ultrahigh Vacuum Studies of the Reaction Kinetics and Mechanisms of Nitrate Radical with Model Organic Surfaces
… gas-phase nitrate radicals, a key nighttime atmospheric oxidant, and organic particles will enable scientists to predict the fate and lifetime of the particles in the atmosphere. In an effort to acquire knowledge of interfacial reactions of nitrate radical with organics, model surfaces are …
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Modeling, fabrication and optimization of optically transparent - thermally insulating silica aerogels for solar thermal applications
… present an alternate approach that operates at atmospheric pressures with simple, black, absorbing surfaces. An Optically Transparent Thermally Insulating (OTTI) layer was assumed to be coated on the back side of the black, broadband absorber. This absorber was assumed to have perfect …
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Metal Hydride Heat Pumps for Thermal Management of Devices
… In a typical MHHP, the equilibrium plateau pressures of the hydrides (in two different cylinders) are used to control the non-equilibrium thermodynamics. Minimum temperatures in the range of +16<super>o<super>C to -12<super>o<super>C were obtained by varying the equilibrium pressure ratios …
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Effects Of Bedding Void On Internal Moment Increase In Concrete Pipes
… carrying the sewage flow, but return to normal atmospheric pressures when the flow stops. Since the water table encases most of the pipe circumference, no leaks is developed from the water table to the pipe when the pipe is under pressure. Once the pressure in the pipes returns to zero, the …