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 27 for “"Air environment"”.
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Characterizing the Indoor Air Environment In the Homes of First Nation Children and Youth Using Remote Community-Based Research Methods: Household Conditions, Air Quality, and Preliminary Health Outcomes
Indoor air quality is a critical determinant of physical and mental health. Despite evidence linking poor indoor air quality to adverse health outcomes, this issue is understudied in the context of First Nations children and youth health and wellbeing. The objectives of this study were to (1) …
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Experiment and modeling : ignition of aluminum particles with a CO2 laser
… systems, metal ignition and combustion occur in environments with rapidly changing temperatures and gas compositions. The kinetics of exothermic reactions in related energetic materials is commonly characterized by thermal analysis, where the heating rates are very low, on the order of 1 -50 …
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Interfacial physics in meniscus-confined electrodeposition and its applications for fabricating electronic structures
… of designed shapes and sizes in an ambient air environment. This technique is cost-effective to implement and is based on the principle of electrodeposition, and can thus be applied to fabricate structures made of a wide variety of materials. In this work, theoretically, a detailed analysis …
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Development of a multiple-specimen, reversed-flexure fatigue tester and its application to the testing of titanium sheet
… ratio is complicated by little understood environmental effects. A major consideration when designing structures is the fatigue resistance of available materials. The goals of this investigation were the development of a multiple-specimen fatigue tester and the evaluation of the fatigue …
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Fall Velocity of Rigid Sphere in Asymmetrically Oscillating Fluid
… occurring generally in the earth's water and air environment, is important to land-form development and water and air pollution control. A basic question on sediment suspension in nature fluid body is why the sediment particles do not settle down even though they are heavier than the …
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A fundamental study of two-dimensional room ventilation flows under isothermal and non-isothermal conditions
Understanding room air distribution is essential to the design of a ventilation system and the control of room thermal and air quality conditions. To investigate the various aspects of room air distribution, a Room Ventilation Simulator was developed with several unique features: an outer room with …
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Investigation into the Processing Parameters of Phosphate-based Dechlorination of Electrorefiner Salt Waste
… dechlorinated at the laboratory scale in an air environment at 600˚C with phosphoric acid as the phosphate precursor. Our findings represent a significant step toward advancing the Technology Readiness Level of phosphate-based dechlorination methods and develops a strategy for future …
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Design and Evaluation of a Portable Ultra-Violet Microbial Disinfection Chamber
With the increasing interest in the indoor air environment over the last 30 years has come the need for control devices that can improve the quality of air that people breath. To answer this need, many devices have been developed and are currently in use. This thesis utilizes Ultra-violet light to …
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Electrospun carbon nanofiber electrodes decorated with palladium metal nanoparticles : fabrication and characterization
… electrolyte membrane (PEM) fuel cells and metal-air batteries. The process involved electrospinning a solution of polymer (polyacrylonitrile), noble metal salt (palladium (II) acetate), and organic solvent (n,n- dimethylformamide) to fabricate a porous, non-woven, free-standing nanofiber mesh. …
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Common plastics degradation in coastal environments
… in landfills and dumps or littered in the environment. Once in the environment, plastic waste is degraded through factors working together or in sequence. They cause degradation, defined as a process that causes the material to lose its original properties and fragmentation. In the …
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Generation of graphite particles by abrasion and their characterization
… was conducted, both in a low relative humidity air environment. I have used both a commercial non-nuclear grade graphite denoted, GM-101, and a nuclear grade, MLRF1, from SGL Carbon for these tests. For spinning abrasion, GM-101 and MLRF1 were used. For sliding abrasion, only GM-101 was used. I …
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Soot formation in vitiated-air diffusion flames
… flame combustion products simulate a vitiated-air environment: the air is preheated, rich in radicals, and depleted in oxygen. A two stage burner was used to investigate the effects of vitiation on the soot yield in diffusion flames. In the first stage, a fuel-lean premixed methane flame …
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Towards an effective enforcement of environmental criminal law : re-thinking sanctions for air pollution criminals in Iraq
… of the current legal framework of Iraqi air environment protection by identifying the many challenges confronting this framework and the obstacles which impede appropriate enforcement measures. One of the main issues is the overlap in Iraqi environmental laws which present judges with …
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MEMS Biosensor for Water-Immersed Application
<p>Although many air-based sensing mechanisms exist, not all of them can be applied in the water-based environment. In order to obtain a cell-based biosensor, the sensing method needs to be reliable and repeatable in a liquid environment. Therefore, this study is focused on transforming existing …
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Role of selenium in neonatal lung development
… and protecting lungs from hyperoxia. In a normal air environment, pulmonary disaturated phosphatidylcholine/total phosphatidylcholine ratio was significantly decreased in 16-d-old Se-deficient rat pups in comparison to Se-adequate rat pups, implying that Se deficiency results in less functional …
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Micro-Manipulation and Bandwidth Characterization of Ionic Polymer Actuators
… effect of ionic polymers operating in an open air environment, research was performed to help characterize this effect. Through the use of frequency response analysis, trends were established showing how the material's response characteristics varied with time, as the polymer dehydrated. These …
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Empirical investigation of underwater blast
… phenomena and effects of demolition in an air environment are very different from demolition under water. A principle difference is that a submerged detonation creates a pulsating gas bubble. Such a bubble is absent in an explosion in air. This thesis is focused on underwater detonations. …
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Rhenium, osmium and iridium diborides by mechanochemistry: Synthesis, structure, thermal stability and mechanical properties
… after ReB2 powder was exposed to the moist air environment for a twelve month period of time. Hexagonal osmium diboride (h-OsB2), a theoretically predicted high-pressure phase, has been synthesized for the first time by a mechanochemical method, i.e., high energy ball milling. X-ray …
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Use of solid-phase microextraction to detect semiochemicals in synthetic and biological samples
… was previously used in the fields of environmental toxicology and food science to identify contaminants and was only recently applied to the fields of insect and mammalian semiochemicals. Solid-phase microextraction provides many benefits, namely the ability to detect unstable volatile …
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