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 22 for “"gas sampling"”.
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Recollection of ICU admission
… of our practice of wardrounds, arterial blood gas sampling, and light sedation of patients. In addition, staff preconceptions about patients' reactions to the ICU needed evaluation. The patients analyzed included a wide spectrum of race, religion, occupation, and educational levels. The more …
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Multi-Row Film Cooling Boundary Layers
… producing the next generation of more efficient gas turbines. The objective of the present study is to conduct several different measurements of multi-row film cooling arrays in order to better understand the physics involved with injection of coolant through multiple rows of discrete holes into …
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Adsorption behavior of volatile organic componds in metal-organic frameworks
… of volatile organic compounds (VOCs) from the gas phase. The adsorption of VOCs on high surface area materials is an important process for many applications including purification and gas sampling (preconcentration). These applications often involve the complete removal of often toxic compounds …
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Ionization in diesel combustion: Mechanism, new instrumentation and engine applications
… sensor has been used for combustion sensing in gasoline engines for which ionization mechanisms have been developed. This is not the case in diesel engines.</p> <p>In this dissertation, a new mechanism for ionization in diesel engines has been developed and experimentally validated. Moreover, a …
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Effects of Downwash when Measuring Gas Concentration with UAV-Mounted Gas Sensors
… to cause significant changes in density-based gas concentration measurements. US regulations evaluate gas concentration as a function of gas density, and accurate concentration measurements are critical for protecting health and safety, which means evaluation of actual downwash effects on …
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Atmospheric Impact of Biogenic Volatile Organic Compounds: Improving Measurement and Modeling Capabilities
… permeation to preconcentrate reactive organic gases in small sample flows for atmospheric gas sampling, enhancing the sensitivity and detection limits of analytical instruments. Enrichments between 4640% and 111% were measured for major reactive atmospheric gases at ultra low flow rates and …
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The transport and remote oxidation of compartment fire exhaust gases
… fires result from inhalation of the toxic gas, carbon monoxide (CO), especially in locations remote from the burning compartment. This causes the transport and oxidation of CO in burning buildings to become an important topic. Studies have been conducted to determine the toxic environments …
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Experimental and Numerical Study of Multi- Phase Flow in a Coaxial Air Jet
… irregularly entrained in the coaxial air jet. Gas sampling showed this irregular entrainment was related to significant variations in the concentrations of CO2 off the jet centerline. Introducing a particle stream had little effect on the CO2 concentrations.
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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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CO2 monitoring by optical emission spectroscopy and mass spectrometry for CO2 plasmas
Carbon dioxide is a critical gas for many industrial and scientific applications. Different metrologies can be employed to measure the CO2 concentration in such systems. In this work quadrupole mass spectrometry and optical emission spectroscopy methods are compared. The QMS method was implemented …
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Quality assurance project plan for a ruminant emission measurement system
… to atmospheric accumulation of greenhouses gases. A Ruminant Emission Measurement System (REMS) was designed, constructed and tested at the Metabolism Unit of the Beef Cattle and Sheep Field Laboratory at the University of Illinois at Urbana-Champaign to quantify these emission rates for …
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The determination of the operating characteristics of an 18- inch stoneware gas absorption tower
… experiments, using carbon dioxide, in a flue gas mixture, as the solute and water as the solvent were made to determine some of the operating characteristics of the tower. A new gas sealer was designed and constructed using a spiral cooling unit made from 5-inch stove pipe elbows. The elbows …
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Nitrogen oxide emissions from circulating fluidized bed combustion
… as one petroleum coke, were used in the study. Gas emissions in the flue gas and gas concentration profiles for 02, NOT, CO, CH4 and N20 inside the combustor were measured under various operating conditions. A multi-point gas sampling system was developed to accomplish the tasks. Parametric …
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Urea fertilizer placement effects on soil greenhouse gas emissions and corn growth
… for a majority of human caused greenhouse gas (GHG) production, such as N₂O and carbon dioxide (CO₂). Nitrous oxide is a potent GHG that stays in the atmosphere for at least 100 years. It is also an ozone-depleting gas. Carbon dioxide is problematic due to its abundance in the atmosphere. …
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Innovative hydrocarbons recovery and utilization technology using reactor-separation membranes for off-gases emission during crude oil shuttle tanker transportation and natural gas processing.
The increase in greenhouse gas (GHG) concentrations in the atmosphere, as well as the high rate of depletion of hydrocarbon-based resources have become a global concern. A major source of emissions of hydrocarbon vapours occur during loading and offloading operations in crude oil shuttle tanker …
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Tracing fluid dynamics with noble gas and stable isotope systematics : examples from Krafla, Iceland and Sichuan Basin, China
The study of noble gases and reactive gases (i.e., CO2, N2 and CH4) in crustal reservoirs can help better understand the origin, migration and accumulation processes of crustal fluids in the subsurface environment, which provide further insights into fluid dynamics underground. This PhD thesis …
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Field scale trials of a geosynthetic capillary break
… were instrumented with water content sensors and gas sampling ports to monitor the movement of water and oxygen through the various covers. Matric suction sensors were also installed in Plots A and B to measure the water suction within the covers. A meteorological station was installed to gather …
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A test-cell installation of a gas turbine engine to investigate the performance advantages of low aromatic fuel
… Fuels Research to increase the level of gas turbine expertise within the mechanical group. This included gaining an intimate familiarity with the jet fuel business, and all relevant aspects of gas turbine technology and jet fuel combustion performance. This project formed a component of …
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Applications of a hand-held optoelectronic nose: security screening, medical diagnosis and food inspection
… convenient and effective method for liquid and gas analysis of relevant analytes where the specificity derives from the pattern of response from cross-reactive and chemoresponsive sensor sets. Colorimetric sensor arrays have seen successful applications in differentiating among diverse families …
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The Effect of Prescribed Burning on Soil Microbial Communities, Nutrients, and Carbon Dioxide Fluxes Under and Between Sagebrush Canopies in the Semi-Arid Rangelands of Northern Nevada
… Soil moisture was measured during soil sampling. Soil CO2 gas samples were collected once every month for two years at site one and for one year at site two. Gas samples were collected at three different times, time zero (T0), time ten (T10), and time twenty (T20). Soil temperature and …
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