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 28 for “"Carbon dioxide gas"”.
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Carbon nanotube based carbon dioxide gas sensors for respiratory monitoring.
… for monitoring the concentration of exhaled CO2 gas in human breath. Limitations such as high power, large size, lack of portability and undesirable use of sampling tubes are experienced currently during respiratory CO2 monitoring. CO2 being a very important biomarker, it is desirable to extend …
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QUANTITATIVE VISUALIZATION OF CARBON DIOXIDE GAS TRANSFER AT A TURBULENT FREE SURFACE
… study the aqueous-phase side of the transfer of carbon dioxide gas across an air-water interface. Quantitative imaging techniques are used to directly visualize the physical processes which determine the average gas transfer rate. The interface is a free surface in the absence of mean shear, with …
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The kinetics of reduction of iron from silicate melts by carbon monoxide--carbon dioxide gas mixtures at 1300C̥
Thesis: Sc. D., Massachusetts Institute of Technology, Department of Materials Science and Engineering, 1987
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Evaluation of the diving reflex in response to water-based foam vs. carbon dioxide gas depopulation in White Pekin ducks
… to onset of unconsciousness between foam and CO2 gas for ducks aged 5-9 weeks. Experiment 2 evaluated the effects of non-terminal submersion in both flowing and standing water and water-based foam on heart rate and duration of bradycardia. Experiment 3 evaluated the effect of abolishing …
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Carbon Dioxide Gas Separation from Syngas to Increase Conversion of Reverse Water Gas Shift Reaction via Polymeric and Mixed Matrix Membranes
… efficient separation strategy for effluent gases in the Reverse Water Gas Shift (RWGS) reaction to increase the overall conversion of CO2 to CO. This process involves a separation and recycling process to reuse the unreacted CO2 from the RWGS reactor. The carbon monoxide produced from this …
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Development of a High Temperature Gas-Cooled Reactor TRISO-coated particle fuel chemistry model
… the chemical environment in a High Temperature Gas-Cooled Reactor TRISO fuel particle. Fission product inventory versus burnup is calculated. Based on those results a thermodynamic analysis is performed to determine fission product vapor pressures, oxygen partial pressure, and carbon monoxide …
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Enhancing Gas Absorption with Nanoengineered Surfaces for Bubble Manipulation
Efficiently reacting gases with liquid absorbents is a crucial aspect of numerous industrial processes on a large scale. When the gas phase is in the form of discrete bubbles within an absorber unit, such as in bubble column absorbers or gas sparging systems, the effectiveness of these bubbles' …
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Geochemical methods for evaluating the origin and evolution of ground water in volcanic rocks
… Stable isotopes of oxygen, hydrogen, carbon and sulfur were successfully used to delineate recharge zones and identify solute sources. Laboratory study of water-rock interactions established the source of solutes and the nature of the chemical reactions that control ground-water …
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Preparation, characterization and testing of inorganic ceramic membranes.
A novel approach to enhance the concentration of Carbon dioxide to economic scale using low efficient Inorganic Ceramic membranes has been proposed. This was achieved by the addition of second and third stage permeation trains to the existing low CO2 recovering Ceramic Inorganic membranes. The …
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Studies of the surface and bulk reactivity of calcium hydroxide
… in the ageing process was confirmed to be carbonatation (or carbonation). This ageing process was then followed by analysing a sample of calcium hydroxide over a long time period (350 days) and by looking at variations in the process by exposure of the sample to various gases and vapours, …
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Design of a microbreather for two-phase microchannel devices
… a two-phase flow of methanol solution and carbon dioxide gas. Differences in the underlying physics between microscale and macroscale systems, however, provide a new set of challenges for multiphase microscale devices. In thermal management devices, large pressure fluctuations caused by the …
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Engineering Biological Materials for Carbon Capture and the Electrochemical Reduction of Carbon Dioxide to Light Hydrocarbons
Decarbonization of the global economy will require the identification of substitute carbon sources for the production of fuels, plastics, textiles, pharmaceuticals, and other products that are derived from fossil carbon. The gigaton scale of carbon dioxide emissions necessitates the development of …
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Investigation of pressure-tube and calandria-tube deformation following a single channel blockage event in ACR-700
… tube (CT), and the gap in between is filled with carbon dioxide gas. The space between the CTs is filled with the heavy-water moderator. One postulated accident scenario for ACR-700 is the complete coolant flow blockage of a single PT. The flow is not monitored within each individual PT, thus …
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Synthesis of mixes ligand metal-organic frameworks for sorption studies
… interest owing to their diverse applications in gas storage and separation, luminescence, catalysis, non-linear optics as well as magnetism. The first part of this study describes the synthesis and characterisation of five pyridyl N-donor diimide ligands namely; …
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Elucidating Temporal Variability in Organic Matter Sources and Cycling in Tropical Rivers
Tropical rivers are large sources of carbon to the atmosphere and the ocean. The composition of riverine organic matter (OM) affects the size of these fluxes by governing how much carbon will be returned to the atmosphere while in transit versus exported to the ocean, where carbon can be …
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A Wiener Chaos Based Approach to Stability Analysis of Stochastic Shear Flows
… expands, consuming oil reserves, generating carbon dioxide gas and adding to environmental concerns, there is an increasing need for drag reduction technology. The ability to maintain a laminar flow promises significant reductions in drag, with economic and environmental benefits. Whilst …
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Physicochemical Interactions at Interfaces: Mass and Charge Transfer at Chemically Reacting Interfaces
… the impacts that microscale texture have for gas evolving electrochemical electrodes is investigated to highlight the unique design considerations that exist for gas evolving electrochemical electrodes that are distinctly different than non-gas evolving electrochemical systems. Next, the …
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Scale prevention in sea water evaporators Part II: decarbonation-filtration treatment
… scale composed of calcium sulfate, calcium carbonate, and magnesium hydroxide on the heat transfer surfaces of the evaporators. Various chemical and mechanical treatments have been successfully used by industry to prevent scale formation in fresh water distilling plants but these processes …
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Aviation and climate change: a focus on Zambia’s international aviation emissions.
… one of the fastest growing sources of greenhouse gases (GHGs) emissions and accounts for about two percent of the global GHGs emissions. This study therefore endeavoured to assess on how a low carbon aviation industry could be enhanced in Zambia. Thus the study estimated the levels of …
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Aviation and climate change: a focus on Zambia’s international aviation emissions.
… one of the fastest growing sources of greenhouse gases (GHGs) emissions and accounts for about two percent of the global GHGs emissions. This study therefore endeavoured to assess on how a low carbon aviation industry could be enhanced in Zambia. Thus the study estimated the levels of …
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