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 30 for “"gas content"”.
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The gas content of luminous compact blue galaxies in the COSMOS field
… evolve, we make use of LCBGs to study their gas content as it changes over approximately nine billion years of lookback time. We make use of HI emission line data provided by the full CHILES survey, covering a redshift range of z=0 to z=0.45 within the COSMOS f ield as well as continuum data …
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An experimental apparatus to study enhanced condensation heat transfer of steam on horizontal tubes
… leak-tight apparatus so that the non-condensable gas content of the steam can be kept to a few parts-per-million. The boiler and steam piping is made of glass and stainless steel with rubber gaskets. Copper is used for the condensing tubes. The completed system has been tested satisfactorily at …
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Measurements, Modeling and Analysis of High Pressure Gas Sorption in Shale and Coal for Unconventional Gas Recovery and Carbon Sequestration
In order to exploit unconventional gas and estimate carbon dioxide storage potential in shale formations and coal seams, two key questions need to be initially answered: 1) What is the total gas-in-place (GIP) in the subsurface reservoirs? 2) What is the exact ratio between bulk gas content and …
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Hydrodynamische Effekte unter besonderer Berücksichtigung der Wasserqualität und ihre Messverfahren
… to assess the quality of fluids regarding their gas contents and their nuclei distributions, various measuring methods and devices have been developed and constructed since the beginning of the twentieth century. This historical development could be described nearly completely in this work, …
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Quantification of regional perfusion, shunt fraction and ventilation using positron emission tomography : a nonlinear tracer kinetics model
Quantification of gas exchange in the lung using Positron Emission Tomography (PET) allows validation of mechanistic hypotheses regarding the local regulation of pulmonary function. We have developed a nonlinear lumped-parameter model to simulate the regional kinetics of the tracer 13N2 as measured …
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Extreme Stellar Populations in the Universe: Backsplash Dwarf Galaxies and Wandering Stars
… their morphology, star formation history and/or gas content indicative of evolution seen in simulations of satellite/parent galactic interactions. Our results offer strong support for scenarios in which dwarfs of different types form a sequence in morphology and gas content, with evolution along …
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Cavitation and Bubble Formation in Water Distribution Systems
Gaseous cavitation is examined from a practical and theoretical standpoint. Classical cavitation experiments which disregard dissolved gas are not directly relevant to natural water systems and require a redefined cavitation inception number which considers dissolved gases. In a pressurized water …
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A Parametric Study and Economic Evaluation of Drilling Patterns in Deep, Thick CBM Reservoirs
… horizontal drilling will result in higher gas production and consequently more revenue, the drilling cost in these wells are significantly higher than the vertical wells. When the coal beds are thick enough that the contact of wellbore and formation is not a limiting issue, the practicality …
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Galaxy evolution : near and far
The formation of stars from interstellar gas is the cornerstone of galaxy evolution. This thesis represents work undertaken in order to characterise the role of cool interstellar gas, and its relation to star formation, in galaxy evolution across cosmic time. In particular, it concentrates on star …
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Identity and dynamics of the microbial community responsible for carbon monoxide oxidation in marine environments
… and may itself contribute to the 'greenhouse' gas content of the atmosphere. An important sink for CO in seawater is the biological oxidation of CO to CO2 by marine microorganisms. The objectives of this study are to identify component members of the microbial community responsible for the …
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Methane storage and transport via structure H clathrate hydrate
… to be exploited for methane storage. The methane content in the hydrate, hydrate kinetics and conversion rates are areas of particular importance. Experiments and theory are employed at the macroscopic and molecular levels to study the relevant phenomena. sH hydrate was successfully synthesized …
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The Nature and Origin of Large Scale Diffuse X -Ray Emission in the Large Magellanic Cloud
… X-ray emission, indicative of hot ≳ 106 K gas associated with this irregular galaxy on scales from ∼10 pc to ≥1000 pc. Here we examine the nature and origin of the large scale diffuse X-ray emission from the LMC. We first examine the large scale spatial distribution and physical …
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Modification of Wood Fiber with Thermoplastics by Reactive Steam-Explosion
… melt viscosity were studied along with oxygen gas content of the steam-explosion reactor vessel. Modification of co-processed wood fiber was characterized in four studies: microscopy analysis of dispersion of PO with wood fiber, sorption properties of co-processed material, chemical analysis of …
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Constraining the Origin of Multiple Stellar Populations in Stellar Clusters
… constraints from such studies coming from the gas content of young massive clusters and their star formation histories. These studies showed that: 1) young massive clusters are consistent with a single star formation burst, and 2) there is no significant cool gas reservoirs left within young …
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Improvements in Liquid Composite Moulding through Assessment of Process Parameters
… effects of infusion methodology, resin dissolved gas content, and the effects of pre-cure environmental moisture. These topics were investigated in detail, with infusion methodology, resin dissolved gas saturation state, and resin moisture content all being found to have significant impacts on the …
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Quenching of Star Formation in the Local Universe A Comparison of Hydrodynamical Simulations with Spectroscopic Observations
… processes at play. We first show how both gas fraction and star formation efficiency (SFE) decrease in Sloand Digital Sky Survey (SDSS) galaxies at z = 0 as they depart from the star-forming Main Sequence (MS) towards quiescence. We further show that both quantities correlate similarly …
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Physical modelling of galaxy clusters and Bayesian inference in astrophysics
… observational models considered only model the gas content of the cluster. To compare the physical and observational models I consider their posterior parameter estimates, including the calculation of a metric defined between two probability distributions. The models' fit to the cluster data is …
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Identifying intervening absorption systems for use as cosmological probes
… the metal absorption systems by probing the gas content (Zibetti et at., 2005; Ménard et at., 2005) that lie on the line-of-sight (LOS) of the background quasars. This study will generate a database of absorption systems, primarily the MgII, CIV doublets using the spectra of tens of thousands …
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Cavitation erosion of materials
… that those emulsions with a high mineral oil content suppress erosion the most, This phenomenon is considered to be either the result of a reduction in nucleation of highly damaging surface cavities due to the elimination of surface nuclei by an oil film, or to damping of cavity collapse due …
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Hydro-dynamic Effects with Particular Consideration of Water Quality and their Measurement Methods
… die Qualität der Flüssigkeiten bezüglich ihres Gasgehaltes und ihrer Keimverteilung beurteilen zu können, wurden mit Beginn des 20. Jahrhunderts unterschiedliche Messmethoden und Apparaturen entwickelt und gebaut. Diese Entwicklung ließ sich annähernd vollständig darstellen, hierbei besonders …
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