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.
Results
Showing 1 to 20 of 429 for “"CH4"”.
-
Rational Catalyst Design for Direct Conversion of CH4 and CO2
… of catalyst structure, reaction temperature, CH4 partial pressure and the Pt loading on the methane activation were outlined. Results revealed that a strong metal-support interaction, characteristic for the ceria supported samples, had a pronounced impact not only on the total amount of …
-
The chemistry of CH4 on Ni(111) by Qing-Yun Yang.
Thesis (Ph. D.)--Massachusetts Institute of Technology, Dept. of Chemistry, 1989.
-
Evaluating Surface Mechanisms for Catalytic Combustion Of H2 and CH4 on Pd Catalysts
… micro-reactors for catalytic combustion of CH4 and H2 on g-Al2O3 supported Pd catalysts, which are used to evaluate and refine surface chemistry mechanisms. The experimental results are compared to predictions by a transient numerical model for a catalytic channel flow with intra-phase …
-
Validation, Analysis of Annual Cycle, and Biogenic Sequestration of CO2, and Modulation of CH4
… gases, such as carbon dioxide (CO2) and methane (CH4), play a critical role in the processes of global warming and climate change. Retrieved CO2 from satellites (e.g., OCO 2, GOSAT, AIRS, TES) offer a fresh opportunity to understand the variability of CO2 over the global domain that was …
-
Soil-atmosphere fluxes of CO2 and CH4 in annual and perennial cropping systems in southern Sweden
… out to compare soil-atmosphere fluxes of CO2 and CH4 from annual and perennial cropping systems at a study site in southern Sweden. The site comprised two adjacent fields, one growing the perennial grain intermediate wheatgrass, the other following an annual crop rotation. Using the chamber …
-
Produzione di H2 e CH4 da frazioni biodegradabili di rifiuti urbani e da siero lattiero-caseario
… Considering the energetic aspect, combined H2 + CH4 production is, from a theoretical point of view, more favourable than conventional anaerobic digestion (Dong et al., 2011). Hydrogen gas, in particular, is considered a clean energy carrier characterized by the highest energy content per unit …
-
Characterisation of a Cavity Ring-Down Spectrometer for measuring CO2, CH4, delta13CO2, and delta13CH4 in ambient air
… measurements of the greenhouse gases CO2 and CH4, along with their isotopologues 13CO2 and 13CH4, are the basis for estimating the atmospheric CO2 and CH4 fluxes on high temporal resolution and for identifying their sources and sinks. The Cavity Ring-Down Spectrometer (CRDS) G2201-i measures …
-
Comparisons of N2O and CH4 fluxes as affected by land use systems and climate in small catchments in Korea
… gases like Nitrous oxide (N2O) and Methane (CH4) are of global concern, too, because they are involved in global warming and therewith: climate change. Major sources of N2O are agriculturally managed soils, and very important sources of CH4 are rice paddies. Thus, it is of great importance to …
-
Matéria orgânica e fluxos de CO2 e CH4 em área minerada e fertilizada com cama de aviário e fosfato natural
… associados às atividades agrícolas (N2O, CO2 e CH4). Além disso, a aplicação de dejetos ao solo e o cultivo podem determinar a ocorrência do efeito priming, e contribuir para reduzir a matéria orgânica nativa do solo. A fim de validardiferentes estratégias na recuperação de sítios minerados para …
-
Estudio de ánodos basados en (La,Sr)TiO3 y CeO2 modificados con Pd para su aplicación en celdas IT-SOFC alimentadas con CH4
… húmedo de metano (SRM) con conversiones de CH4 de 12% y 16%, estas pueden considerarse insuficientes para su implementación en celdas de alimentación directa. Estos resultados motivaron el estudio de materiales compuestos con propiedades complementarias. En este sentido, mediante el método …
-
Investigation of Methane Emissions and Sources
Methane (CH4) is an important trace gas and the most potent greenhouse gas in the global atmosphere. This study addressed CH4 related issues using a multi-pronged approach to monitor, characterize, and quantify CH4 emissions and sources through three observational platforms including Remote Methane …
-
Methane Emissions from Direct-Seeded, Delayed-Flood Rice Grown on a Clay Soil
<p>Due to the production of methane (CH4) under flooded-soil conditions, rice (Oryza sativa L.) cultivation is a major contributor to agricultural CH4 emissions. Studies examining CH4 emissions from rice have only recently been initiated in Arkansas and no data have been collected from rice …
-
Sea surface distribution of nitrous oxide and methane in European shelf seas and the Atlantic Ocean
… active gases, nitrous oxide (N2O) and methane (CH4), in the troposphere. There are currently uncertainties in quantifying the natural sources and sinks of N2O and CH4 in the marine environment. This thesis presents high-‐resolution surface-‐ocean and atmospheric data for N2O, CH4, CO2 and CO, …
-
The effects of land use, temperature and water level fluctuations on the emission of nitrous oxide (N2O), carbon dioxide (CO2) and methane (CH4) from organic soil cores in Iceland
… oxide (N2O), carbon dioxide (CO2) and methane (CH4). The purpose of this study was to gain insight into the influence of temperature, water level and water level fluctuations on the GHG emission of soils representing the three major types of landuse in Iceland: undisturbed peatland, drained …
-
Measuring Methane Emissions in the Urban Environment
Mitigating methane (CH4 ) emissions is a necessary intervention to address the immediate impacts of anthropogenic climate change. Bottom-up inventories and models are used to predict the quantity of CH4 emissions, but these estimates are poorly constrained, especially on a source-by-source basis. …
-
Methane Emissions and Ammonia Volatilization from Drill-Seeded, Delayed-Flood Rice on a Silt-Loam Soil in Arkansas
… Agency (EPA) currently uses a single methane (CH4) emissions factor of 160 kg CH4-C ha-1 for a primary rice (Oryza sativa L.) crop. The emissions factor is based on studies that do not adequately represent current management practices in Arkansas. Another concern is pre-flood fertilizer …
Page 1 of 22