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 22 for “"gas properties"”.
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Development and application of a portfolio selection model for producing crude oil and natural gas properties, The
Includes bibliographical references (pages 194-200).
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Automatic type curve matching for predicting gas wells production
The determination of gas wells production using type curve matching is one of the methods used in evaluating gas reservoirs. Matching curves manually is time consuming and exposed to human error. Aminian type curves unlike the other type curves accounts the pressure dependency of gas properties and …
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Real gas effects in ORC turbines
This thesis aims to study the effects of varying gas properties on turbine performance. Most prominently ORC turbines are operating with a multitude of different working fluids that have very strong variations in gas properties. Moreover, this also applies to conventional steam turbines or first …
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Using HI stacking to study galaxy properties in the nearby universe (Looking for needles in the HI-stack)
… raw fuel from which the star-forming molecular gas forms and is therefore an important tracer of galaxy evolution. Due to the intrinsic faintness of the Hi emission line (observed at rest at 21 cm), galaxies beyond a few hundred megaparsecs are difficult to observe directly with current radio …
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Labyrinth Seal Preprocessor and Post-Processor Design and Parametric Study
… influence of various operating conditions and gas properties on excitation force (effective cross-coupling stiffness), a parametric study is performed on both the eye seal and the balance piston labyrinth seal.
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Numerische Untersuchung abgelöster Düsenströmungen
… flow characteristics are shown in separated cold gas nozzle flow simulations. Here the gas properties can be described by the perfect gas relation. Also, experimental data and observations are available in abundance. Flow separation with and without reattachment and possible hysteresis effects are …
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Spatially resolved study of the molecular isotopologue 13CO in nearby galaxies
… data for these surveys, I study the molecular gas properties in relation to the stellar population and other ISM components within galaxies and to the global parameters of the galaxies. Among our sample, we find that the R values are higher in the interacting galaxies in the isolated galaxies. …
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Lenticular galaxies - the one in the middle
… was used for this project to study molecular gas properties as well morphologies associated with dust where molecular gas is present. A variety of image processing techniques are employed to study the details of galaxies to uncover the presence of molecular gas in S0 galaxies. We obtained …
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An experimental investigation of transverse jets in supersonic crossflow
… that are closely linked to the injectant gas properties. The peak shear layer vortex shedding frequency is inversely proportional to the J. This conclusion is confirmed by the SPOD and DMD data and the extract modes are addressed. Pressure loads beneath the jets were presented and linked …
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Ab Initio Computation of Radiative Properties of Monatomic Hydrogen
… <p>A method for computing high temperature gas emissivity and absorptivity from quantum mechanics principles is developed. The Schroedinger wave equation is cast as a discretized matrix eigenvalue problem which is solved using the ERAU parallel supercomputer. The numerical solutions for the …
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Development of high-performance GaN-based power transistors
… degradation of the two-dimensional electron gas properties due to the sputtering-induced surface damage is effectively removed by a buffer layer protection or a post-annealing treatment. A metal-oxide-semiconductor (MOS)-HEMT with sputtered-gate-SiO2 is demonstrated for the first time, which …
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Immiscible displacement of trapped oil through experimental and data mining techniques.
… investigate the potential and competitiveness of gases used in immiscible gas-enhanced oil recovery (EOR) processes. Methane (CH4), Nitrogen (N2), Air (21%O2/N2) and Carbon Dioxide (CO2) are some of the gases injected in reservoirs to displace trapped oil from reservoir pores. The EOR screening …
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Diode Laser Spectroscopy for Measurements of Gas Parameters in Harsh Environments
The detection and measurement of gas properties has become essential to meet rigorous criteria of environmental unfriendly emissions and to increase the energy production efficiency. Although low cost devices such as pellistors, semiconductor gas sensors or electrochemical gas sensors can be used …
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Patterns of soil maturation and mixing at the Apollo 16 landing site: surface soils
… for major element chemistry and trapped inert gases are assembled from the literature and used to infer the provenance of archetypical soils and kinship relationships of remaining surface samples. The hypothesis of maturation domination of inert gas variations is considered and its consequences …
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An investigation of real gas effects in supercritical CO₂ compressors
… presents a comprehensive assessment of real gas effects on the performance and matching of centrifugal compressors operating with CO2 at supercritical conditions. The analytical framework combines first principles based modeling with targeted numerical simulations to characterize the internal …
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Utilization and Implementation of Atmospheric Monitoring Systems in United States Underground Coal Mines and Application of Risk Assessment
Explosions of gas and dust continue to be recognized as an extreme danger in underground coal mines and still occur despite significant technological advances. Mining researchers have been attempting to accurately measure and quantify ventilation and gas properties since early mining; however basic …
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The Design and Construction of a 20" x 20" Mach 2.0 Blowdown Wind Tunnel to Characterize the Lift and Drag of Irregularly Shaped Fragments
… number of parameters on tunnel run time and test gas properties throughout the tunnel circuit. The design of the settling chamber, test section, supersonic nozzles, diffuser, and exhaust are presented in this thesis. Diffuser performance has a large influence on wind tunnel efficiency and run …
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Gas in Void Galaxies
… formation. We investigate the neutral hydrogen properties (i.e. content, morphology, kinematics) of void galaxies, both individually and systematically, using a combination of observations and simulations, to form a more complete understanding of the nature of these systems. We investigate in …
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