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 24 for “"Gas measurements"”.
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Pulmonary function and acid-base balance high intensity constant-load exercise
… during exercise and some have not included blood gas measurements as a measure of the adequacy of pulmonary function. The studies reported in this thesis were designed to investigate the possible failure of the gas exchanging and pump functions of the pulmonary system during high intensity …
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Studies of Atmospheric Ozone and Related Constituents in the Arctic and at Mid-latitudes
… have been used to measure stratospheric trace gases since 1999 and 2006 respectively. In 2010 and 2014, two solar-tracking systems were integrated with the GBSs to make tropospheric trace gas measurements. One goal of this work was to study surface ozone depletion events (ODEs) in the Arctic, …
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Up in smoke: biomass burning and atmospheric emissions in the Sudanian savanna of Côte d’Ivoire
… burning is an important source of greenhouse gases, chemically active gases, and aerosols. In addition, climate change scientists consider West African savannas as the “burn center” of the planet characterized by middle and late dry season intense fires that produce large amounts of carbon …
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Single- and Two -Photon Fluorescence for the Detection of Nitric Oxide in an Optically-Accessible Direct -Injection Diesel Engine
… with in cylinder, single-photon NO PLIF measurements including: (1) fluorescence interference from the Schumann-Runge bands of hot O2, (2) broadband absorption of a UV excitation beam by in cylinder gases, and (3) difficulty rejecting scattered laser light while simultaneously maximizing …
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Using oscillations to detect capillary condensation in MCM-41
In micro- and mesopores of tight, unconventional gas reservoirs, the net gas-in-place may contain significant contributions from adsorbed/condensed gas. In this study, we present a simple and novel oscillation-based method to measure the net gas-in-place with capillary condensation. This method was …
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Relating Biological Rate Measurements and Microbial Processes Across Diverse Ocean Ecosystems
… using this approach.</p><p>Presenting data and measurements from the most comprehensive survey of marine microbial community structure and patterns of productivity and N2 fixation in the western North Atlantic to date, this manuscript highlights intriguing connections between regional peaks in …
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NMR Studies of Interfacial Reactions in Lithium-Ion Batteries
… of solution NMR spectroscopy and operando gas measurements. The soluble products formed at LCO electrodes are identified, and reaction mechanisms are proposed to rationalise the formation of the observed species. The proposed mechanisms are confirmed by isotopic labelling and by comparing …
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Location, location: Factors influencing greenhouse gas fluxes from the Mississippi Delta agricultural region
… contribute significantly to regional greenhouse gas budgets due to stimulation of soil microbial activity through fertilizer application. Few studies have made measurements of CH4, N2O, and CO2 from the dominant landscape features of the agricultural landscape: farmland, riparian zone, and …
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BARDS analysis of real-time H2 and O2 gas evolution during the total water splitting of an aqueous electrolyte
… for fossil fuels and thus reducing greenhouse gas emissions. A downside to the use of fuel cells is the electrodes used in the production of hydrogen gas are typically made from expensive inert metals such as platinum. Efforts are being made in producing cheap and effective electrodes from new …
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Mobility and fluorescence of barium ions in xenon gas for the EXO experiment
… are plans to build a ton scale xenon detector. Measurements of the purity of liquid xenon in our liquid xenon test cell are reported. These results are relevant to the research on detection of single barium ions by our research group at Colorado State University. Details of the operation of the …
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Exploring Tissue Microstructure in Healthy and Diseased Lung Tissue
… particularly diffusion MRI using hyperpolarized gases, such as helium or xenon. However, since the polarized gas is difficult to prepare and, once prepared, suffers decay of the nonrenewable polarization: limiting both the number and strength of rf pulses that may be applied to the sample), most …
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Water selective MFI zeolite membranes for application in the Fischer Tropsch Synthesis
… was evaluated using n-hexane porosimetry. Single gas and mixture separations were carried out. A trans-membrane pressure gradient was applied in single gas measurements. Binary and ternary mixture separations were carried out using a model reaction mixture that approximates FTS conditions. This …
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Flugzeugmessungen von NO, NOy, CO und O3 in der freien Troposphäre zwischen 60 °N und 60 °S - Nord-Süd-Kontrast und Verteilung in den Tropen
Trace gas measurements of NO, NOy, CO and O3 performed on board the DLR aircraft Falcon are used to examine the interhemispheric differences for midlatitudes during local autumn. The measurements were part of the INCA campaign (Interhemispheric differences in cirrus properties due to anthropogenic …
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The Measurement of Decomposition Products of Select Gases as an Indicator of a Concealed Mine Fire
… problematic. The standard practice is to obtain measurements for certain gas concentrations from an inaccessible area, and to apply certain rules to the obtained concentrations in order to try to decipher whether or not there is a fire in the area. Unfortunately, none of the gas measurements, and …
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Graphene Based Chemical and IR Sensors and Correlated Carrier Transport
… devices have been reported for sensing toxic gases, chemicals, explosives, and radiation, taking advantage of the unique material properties of graphene. For successful development of graphene based sensors and electronics, availability of high quality and large area graphene films is …
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In-situ measurements and calculation of radon gas concentration and exhalation from a tailings mine dump
… This study reports on the 222Rn soil-gas concentrations and exhalations measurements which were conducted at a non-operational mine dump (Kloof) which belongs to Carletonville Gold Field, Witwatersrand, South Africa. Radon soil-gas concentrations were measured using a continuous radon …
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In-situ measurements of radon concentrations in soil gas at a site on the Cape Flats
Measurements of radon (222Rn) concentration in soil gas are routinely used to locate geological fault zones. This study was undertaken to investigate the systematic effects that influence radon soil-gas measurements, in preparation for the first such fault zone measurements in South Africa. The …
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Transport Processes of Reactive Trace Gases in the Atmospheric Boundary Layer
Transport of trace gases within the atmospheric boundary layer plays a key role in feedback processes between the earth’s surface and the atmosphere and consequently in ecosystem budgets of carbon and nitrogen (among many more). For a correct quantification of the exchange between surface and …
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