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 47 for “"Dissolved Gas"”.
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Tracking carbon fluxes across ocean interfaces using dissolved gas observations
… from Arctic permafrost. This thesis focuses on dissolved gases as tracers and drivers of these processes through both autonomous and field-based observations. It encompasses (i) improvements to sensor-based measurements of O2, (ii) the use of these measurements to assess the strength of the BCP …
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Condition assessment using dissolved gas analysis on transmission power transformers
In transmission networks, power transformers and reactors play a major role in the supply of power in the country. Power transformers and reactors are identified as most critical assets and have a significant impact on power network reliability. It is thus important to know the effective condition …
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Tracking carbon fluxes across ocean interfaces using dissolved gas observations
… from Arctic permafrost. This thesis focuses on dissolved gases as tracers and drivers of these processes through both autonomous and field-based observations. It encompasses (i) improvements to sensor-based measurements of O₂, (ii) the use of these measurements to assess the strength of the BCP …
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Dissolved Gas Analysis of Insulating Transformer Oil Using Optical Fiber
… protection systems fail they often generate gas or acoustic signals signifying a problem. Research has already been performed discovering new ways integrate optical fiber sensors into high voltage transformers. This thesis is a continuation of that research by attempting to improve sensor …
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Field-Portable dissolved gas sensing and perspectives in aqueous microplastic detection
… stimulated increased release of methane (CH4), a gas with a shorter lifetime in the atmosphere but with even more heat trapping ability than CO2. In situ analysis of dissolved gas content in surface waters is currently performed with large, expensive instruments, such as spectrometers, which are …
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Field-Portable Dissolved Gas Sensing and Perspectives in Aqueous Microplastic Detection
… stimulated increased release of methane (CH4), a gas with a shorter lifetime in the atmosphere but with even more heat trapping ability than CO2. In situ analysis of dissolved gas content in surface waters is currently performed with large, expensive instruments, such as spectrometers, which are …
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Effect of Contact Angle on Growth of Bubbles Formed From Dissolved Gas
Made available in DSpace on 2014-12-08T23:18:03Z (GMT). No. of bitstreams: 1 6408361.pdf: 8074474 bytes, checksum: ede3f7e10c59070307e171d49701e5dd (MD5) Previous issue date: 1964
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Effects of Dissolved Gas Supersaturation and Bubble Formation on Water Treatment Plant Performance
Gas bubbles that form within water treatment plants can disrupt drinking water treatment processes. Bubbles may form whenever the total dissolved gas pressure exceeds the local solution pressure, a condition termed dissolved gas "supersaturation." This project investigated how bubble formation …
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Characterization of air-sea gas exchange processes and dissolved gas/ice interactions using noble gases
… the cycles of biogeochemically important gases such as 02 and C02, and thereby infer rates of biological activity in the upper ocean or the uptake of radiatively important "greenhouse" gases, the noble gases are used to characterize and quantify the physical processes affecting the …
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The role of dissolved gas fluxes on the biogeochemical evolution of nutrient cycles in lakes.
… Earth's atmosphere, N (as N2) and O (as O2), are gaseous species that are important for their cycling processes. O2 is a very important component in ecosystem metabolism, which includes photosynthesis and respiration, and N2 is important for N2 fixation and denitrification. P does not have a major …
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Characterization of air-sea gas exchange processes and dissolved gas/ice interactions using noble gasses
Thesis (Ph. D.)--Joint Program in Marine Chemistry and Geochemistry, Massachusetts Institute of Technology/Woods Hole Oceanographic Institution, 1998.
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Measurement of Dissolved Gas Concentrations in Natural Waters Utilizing an In-Situ, Membrane Inlet, Linear Quadrupole Mass Spectrometer
… (GSV) and ship's cables to monitor a suite of dissolved gases and volatile organic compounds in saltwater and freshwater environments. Spectrometer data in Lake Maggiore, Florida were acquired at a rate of 0.7-3.6 seconds/sample for 2-3 hours. The resulting multi-analyte spectrometer data were …
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Rheology of molten polystyrene with dissolved gases
Dissolved gases in polymers behave as excellent plasticizers, reducing viscosity significantly through the chain dilution effect and the addition of free volume. Rheological measurements and theoretical modeling are presented for molten polystyrene with dissolved gases, including carbon dioxide, …
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Interfacial Phenomena and Surface Forces of Hydrophobic Solids
… properties, such as initial concentration of dissolved gas and changes in gas concentration. We found that nanobubbles still formed in degassed solutions and that lowering the dissolved gas concentration did not reduce the bubble size, implying that nanobubbles do not form from dissolved gas …
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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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Development of a method for quantitative imaging of air-water gas exchange
… investigate the exchange of a soluble alkaline gas (ammonia) from air to water was developed. Key feature of the method is that a linear relationship between the concentrations of the dissolved gas and the alkaline form of the indicator, that is selectively excited to fluorescence in the …
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Water Treatment: Fundamentals and Practical Implications of Bubble Formation
… entrainment and ozonation are the key causes of dissolved gas supersaturation and eventual bubble formation in water treatment plants. Total dissolved gas probes (TDGP) are now available to directly measure supersaturation and have many advantages compared to conventional techniques. Bubble …
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Power transformer health assessment derived from low energy and dissolved parameters
… of transformer health in terms of energy and dissolved parameters and establishes a novel method to identify a trigger for a change in transformer condition from normal to defective state. The study took the form of both analytic research to create a low energy degradation model and then …
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LARGE-EDDY SIMULATION OF DEEP-WATER HYDROCARBON PLUME DYNAMICS
… hydrocarbon plume is strongly affected by the gas dissolution and hydration process that weakens the bubble-induced buoyancy for driving the plume. In this study, a new modeling strategy is developed to efficiently incorporate the gas dissolution and hydration effects into a fast …
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