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 52 for “"Gas Concentration"”.
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Wide range analysis of ozone gas concentration in ultraviolet region
… is to investigate the development of optical gas sensor employing absorption spectroscopy technique for ozone concentration measurement. Additionally, wide range analysis has been conducted to improve range of ozone concentration measurement using ultraviolet light absorption. Simulation of …
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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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Development of a control system for gas concentration and temperature in an animal preference chamber
… designed and built to control distinct ammonia concentration levels independently in each of the EPC’s four compartments. The FLC was written in MATLAB and utilized in tandem with custom software created in a visual-based programming language. The control software compared NH3 measurements from …
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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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Analyzing decomposition of diisopropyl methylphosphonate (DIMP) in high-explosive detonations using absorption spectropscopy and gas concentration measurements
Submission original under an indefinite embargo labeled 'Open Access'. The submission was exported from vireo on 2025-10-19 without embargo terms
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Development of a Chlorine Dioxide Gas Concentration Monitoring Unit and Kinetic Analysis of the Effect of Chlorine Dioxide Treatment on Color and Microbial Content Change of Spinach
Analytical methods for measuring chlorine dioxide concentration in solution have been extensively researched and documented in literature. Much less common, are the techniques for measuring ClO2 in a gaseous medium, particularly when the measurement is needed to be made continuously in real time. …
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Design and implementation of the SBX1: a smart environment chamber for biological research and discovery
… precise control over temperature, humidity, and gas concentration to mimic natural conditions for cell survival and growth. Many incubators and live cell imaging systems exist as commercial products; however, they are prohibitively expensive, costing tens or hundreds of thousands of dollars …
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Innovative Applications of Laser Remote Sensing of Gases, Aerosols and Wind
… sensing technologies for studies involving trace gases, aerosol particles and wind; which are key components of the Earth’s atmosphere. First, we present the demonstration of gas concentration measurements using a quantum cascade laser open path system with characteristics that make it promising …
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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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A reduced-form statistical climate model suitable for coupling with economic emissions projections
… the equations for temperature and greenhouse gas concentration used in conjunction with the MIT Emissions Prediction and Policy Analysis (EPPA) model or for independent climate analysis based on results from the more complex MIT Integrated Global Systems Model (IGSM). The functions we generate …
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Co-gasification of biomass and plastic waste in a bubbling fluidized bed reactor
… all considered major producers of biowaste. Co-gasification is considered one of the most promising methods of chemical recycling that targets the production of syngas (hydrogen and carbon monoxide) and light hydrocarbon gases. In this study, the gasification of pure birch sawdust wood (BSD) and …
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Interfacial Phenomena and Surface Forces of Hydrophobic Solids
… on solution properties, such as initial concentration of dissolved gas and changes in gas concentration. We found that nanobubbles still formed in degassed solutions and that lowering the dissolved gas concentration did not reduce the bubble size, implying that nanobubbles do not form …
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Environmental Monitoring - using diode-laser-based spectroscopic techniques
Monitoring of environmental gases is necessary to understand the complex processes governing global warming and the impact of pollutant emissions related to human activity. Diode-laser-based spectroscopic techniques, being robust and affordable, have a great potential to become an industrially …
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Smart Platform for Low-Cost MEMS Sensors – Pressure, Flow and Thermal Conductivity
… miniaturising the sensor. Thermal conductivity gas sensors based on a heated tungsten resistor are designed, tested and substantiated with numerical modelling. Holes through the membrane are used to improve the sensitivity to measuring carbon dioxide by 270%. Asymmetric holes are utilised to …
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Mass Transfer of Alkane Solvents-CO2-Heavy Oil Systems in the Absence and Presence of Porous Media Under Reservoir Conditions
… due to heat loss to over- and under-burdens, gas injection is considered to be an effective alternative. One of the major mechanisms associated with gas injection is the molecular diffusion of dissolved gas(es) which reduce the viscosity of heavy oil while inducing oil swelling. Physically, …
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Analysis of gas differential diffusion through porous media using prompt gamma activation analysis
… are critical to predicting the movement of gases in geological media. Here I present a novel methodology for using prompt gamma activation analysis to measure the effective diffusivity of noble gases in a porous medium. I also present a model to estimate the connectivity parameter of a soil …
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Mitigation of ammonia gas from animal house using microalgae
… a strong potential of algae to mitigate ammonia gas from animal house and to be used as a high-value animal feed. Ammonia gas emission from animal manure decomposition is a major concern in animal housing operations. Excessive ammonia gas volatilization will affect both animal and worker health …
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Assessment of high-burnup LWR fuel response to reactivity-initiated accidents
… fuel performance code FRAPTRAN 1.3. Fission gas release (FGR) and swelling were systematically modeled to quantify gaseous loading effects. The grain boundary fission gas inventory is simulated prior to the transient using a diffusion model in FRAPCON 3.3 code. The restructuring of high …
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Drying and ripening of soybeans for beneficiation of soybean products
… soybeans were treated in specially constructed gas-tight silos through which mixtures of air, carbon dioxide, and ethylene in varying concentrations were recirculated for the purpose of maturing and stabilizing the beans and to prevent peroxidases action, the latter being credited with imparting …
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Noble gases: a record of the early solar system
"Analyses of the noble gases in samples of iron meteorites are presented which indicate the following: 1. The inclusions of iron meteorites contain noble gases with a wide range of isotopic compositions. 2. The noble gas concentration and isotopic anomalies arc often grossly inhomogeneously …
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