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 41 for “"CO2 production"”.
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Application of density functional theory and machine learning in the prediction of efficient catalysts for the oxidative coupling of methane with reduced CO2 production at low temperature
… methane (OCM) remains a promising means for the production of ethylene. Though high temperatures of 900 oC and above lead to increased conversion of methane, at higher temperatures, the OCM reaction tends to favour a competing reaction that leads to the production of COx product. This thesis …
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Char Reaction Kinetics in a Transport Gasifier
… data on carbon monoxide (CO) and carbon dioxide (CO2) production as well as kinetic equations were developed as a function of the primary control variables: oxygen-to-carbon ratios, temperature, coal type, and water content. Bench scale tests were preformed using a pressurized fluidized bed …
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Energy budget and foraging behaviour of the Cape gannet Morus capensis during the breeding season
… labelled water technique on adults and chicks. CO2 production was determined from ratios of isotope turnover, and converted into energy expenditure using a factor suitable for a fish-eating seabird.
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Landscape and environmental controls on soil organic matter decomposability in the High Arctic
… was observed between field moisture and CO2 production (mg/gC) with field moisture (FM) predicting about 20% of the variation in CO2 production compared to 1.4% predicted by SOC. Similarly, strong positive and significant correlations were observed between field moisture (FM) and SOC …
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Assembly and functioning of microbial communities along terrestrial resource gradients in boreal lake sediments
… subsidizing between 30-70% of secondary production. This contribution of terrestrial resources is especially important in boreal lakes that are largely nutrient-poor and thus more responsive to these additions. Yet the mechanisms underlying initial processing of terrestrial resources by …
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Improving Existing and Discovering New Hydrogen Storage Materials Using Computational Materials Modeling
… have access to it, and it burns cleanly (no CO2 production) with oxygen to produce a large amount of energy (120 kJ/g). Unfortunately, there are still plenty of basic science and engineering hurdles that need to be overcome for hydrogen to become viable. Foremost among these is storing …
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EOS modeling and reservoir simulation study of Bakken gas injection improved oil recovery in the Elm Coulee field, Montana
… slightly better oil recovery, but with earlier CO2 break-through and larger CO2 production, suggesting that rock property heterogeneity is an important property for modeling because it has a big effect on the simulation results. Long hydraulic fractures shortened CO2 break-through time greatly …
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ΠΑΡΑΓΩΓΗ ΑΙΘΥΛΕΝΙΟΥ ΜΕ ΚΑΤΑΛΥΤΙΚΗ ΑΤΜΟΠΥΡΟΛΥΣΗ Κ-ΕΞΑΝΙΟΥ
IN THIS THESIS IT WAS STUDIED THE PRODUCTION OF ETHYLENE IN THE PRESENCE OF CATALYSTS VIA STEAM CRACKING OF N-HEXANE. VARIOUS TYPES OF CATALYSTS WERE PREPAREDAND TESTED IN AN EXPERIMENTAL PYROLYSIS UNIT. THE CATALYST SAMPLE WITH THE COMPOSITION 12CAO7AL2O3 SHOWED THE HIGHEST SELECTIVITY IN RELATION …
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Applications development of broadband acoustic resonance dissolution spectroscopy (BARDS) in the pharmaceutical, food and animal nutrition industries
… uptake rate of carbon sources and the rate of CO2 production. The relationship between CO2 production and ethanol production have also been achieved. A quantitative value for gas production by individual cells has been established by BARDS experiments. In conclusion, multiple applications with …
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Treatment of Petroleum Hydrocarbons in Oil-Based Drill Cutting Mud Using BiOWiSH Bioaugmentation Products
… of total petroleum hydrocarbons (TPH) and CO2 production respectively. Five experiments were analyzed by TPH extraction and analysis; four experiments were analyzed by respirometric analysis. The specific microcosm conditions tested in the experiments were control, nutrient-only control, …
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The effect of oily waste and nutrient amendments on soil fertility and oat growth
… with sludge had no effect on accumulative CO2 production over sludge alone.
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Physiological Plasticity and Ecology of the Yellow Mud Turtle (Kinosternon Flavescens) During Hibernation
… Finally, I measured O2 consumption and CO2 production at constant temperatures ranging 0.5–28°;C. Metabolic rate increased with temperature but respiratory quotients exhibited an inverse correlation with temperature. Estimated total energy consumption during natural hibernation is 38-51 …
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Mechanistic studies of magnesium electrodeposition and oxygen reduction for energy storage applications
… of the future generations. Global warming due to CO2 production and diminishing reserves of fossil fuels necessitate a transition to intermittent renewable energy production. Renewable energy will require the storage of energy for load leveling and energy usage off the grid. Towards this goal …
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Soil Respiration of Native Saskatchewan Grassland Calculated from Carbon Dioxide Concentration Profiles
… to monitor soil respiration by measuring CO2 concentrations in soil throughout the growing season. The technique of gas chromatography was used to obtain CO2 concentration profiles on native grassland and cultivated soils. The CO2 concentration gradients were then used to calculate CO2 …
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Electron Transfer Processes between Hydrogen Sulfide and Humic Substances - Implications for Anaerobic Sulfur Cycling in Freshwater Ecosystems
… acceptors under anoxic conditions and monitored CO2 and CH4 production to estimate EAC from organic matter. From excess CO2 production, i.e. from CO2:CH4 ratios of 3.2:1, we calculated an EAC of OM of 2.36 µmol e- cm-3 d-1. Addition of sulfate (SO42-) increased CO2 production and suppressed CH4 …
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Acute hypoxia-induced diaphragm dysfunction is prevented by antioxidant pre-treatment
… whole-body plethysmography. O2 consumption and CO2 production were measured as indices of metabolism. Diaphragm muscle contractile performance was determined ex-vivo. Gene expression was examined at 1, 4, and 8 hrs using qRT-PCR. Protein/phosphoprotein content was assessed using a sandwich …
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Impact of extreme hydrological conditions on belowground carbon cycling and redox dynamics in peat soils from a northern temperate fen
… change is under debate. Peatlands are important CO2 sinks but also constitute global sources of CH4. The atmospheric exchange and production rates of these greenhouse gases are strongly influenced by the hydrological regime. An increased frequency of extreme meteorological conditions resulting in …
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Isotopic constraints on sources and cycling of riverine dissolved inorganic carbon in the Amazon Basin
Dissolved inorganic carbon (DIC) and CO2 gas are fundamental components of riverine biogeochemical functioning. Amazonian and humid tropical rivers represent a large, neglected source of CO2 to the atmosphere. Carbon isotopes are invaluable tools for examining sources and cycling of inorganic …
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Methane and carbon dioxide cycling in soils of the Harvard Forest
… in soils faster than it is converted to CO2 by cellular respiration, soil becomes a smaller GHG source and even has the potential to become a GHG sink. Not much is known about factors that drive soil to be a source or a sink of GHG. Soil temperature and moisture have both been shown to …
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