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 16 of 16 for “"extended exposure"”.
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Changes in respiration rates and biomass attributes of epilithon due to extended exposure to zinc
… this research was to determine the influence of extended dosing of zinc on the carbon cycling and biomass characteristics of freshwater epilithon. Experiments were conducted in artificial streams continuously dosed with 0.00, 0.05, or 1.00 mg Zn liter⁻¹ for 20 to 30 days during summer and fall, …
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The effect of the cyanobacterial toxin saxitoxin on neurodevelopment
… generation of action potentials. While acute exposure has been well researched, with safety guidelines applied, chronic low dose exposure from neither marine or freshwater sources has been investigated. Given the role of cellular electrical activity in neurodevelopment this latter pattern of …
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Impact fracture of austenitic stainless steels
… must withstand a wide range of temperatures and extended exposure in aggressive environments, including hydrogen gas. Because of the risk of catastrophe if brittle failure occurs, careful material selection is imperative. Austenitic stainless steels may be a likely choice for hydrogen service …
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Exploring the Glade: a Residential Program as a Transformational Factor on Environmental Knowledge, Attitude, and Action
… programs provide students with non-formal, extended exposure to the outdoors and opportunities to develop confidence, knowledge, attitudes, and abilities. By enhancing these characteristics, programs aim to achieve positive changes in REB that will continue long after students return to …
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Experimental investigation of a catalyst under various solar light conditions for hydrogen production.
… of the photocatalyst is found to change after extended exposure to light. Two possibilities exist, transformation of the photocatalyst to a different configuration and breakdown of the photocatalyst into component parts. Degradation would explain observed changes in photocatalyst quantum …
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The application of scanning tunneling microscopy (STM) and related techniques to the study of organic and biomolecular targets
… disruption of the surface topography. Limited exposure of the Au/mica surfaces to sulfochromic acid leads to the formation of permanent etch pits of the surface that are exclusively one Au layer deep; extended exposure leads to progressive lateral etching of the surface, ultimately leading to …
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The Effects of Low Intensity Ambient Lighting on Refractive Development in Rhesus Monkeys (Macacca mulatta)
… light is not necessarily myopiagenic; however, extended exposure to dim light could cause myopia through reductions in the efficacy of visual mechanisms that normally regulate refractive development.
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Assessment of biomas fuel use and its association with acute respiratory infections among under-five children in Zambia
… of cooking energy. Research indicates that, extended exposure to high levels of biomass smoke can impair the clearing ability of the lungs and render them more susceptible to developing acute respiratory infection (ARI). ARI have been said to cause 15% of all deaths in children under the age …
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Intimate Partner Violence and Negotiation During COVID-19: Stressors, Resources, and Perception
… policies that required social isolation, often extended exposure to one’s intimate partner, and an inability to access stress-reduction resources. These factors, along with many others, lead to an abrupt increase in IPV in many couples. Using the couple-adapted family stress model (ABCX), the …
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A potential energy-saving heat treatment for re-circulated irrigation water and its biological mechanisms
… may be substantially lowered from 95"C with extended exposure time. The goal of this study was to test this hypothesis and make this water decontamination technology economically more attractive while reducing its environmental impact. Specific objectives were to (1) examine the effect of …
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A sensitive period for second language acquismon: A reaction-time study of grammaticality juooments of English by Korean-English bilinguals
… might be able to improve their L2 accuracy given extended exposure to L2 input and/or strong motivation, they probably cannot attain L2 processing speed.
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Mass transfer to reacting laminar films
… the absorption rate of carbon dioxide during extended exposure to such films when they contain sodium hydroxide. An apparatus was developed which enabled transfer rates to be measured for exposure times of up to one minute. The measured rates were compared with those predicted for …
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Sedimentology and Regional Implications of Fluvial Quartzose Sandstones of the Lee Formation, Central Appalachian Basin
… and transport/depositional processes that extended exposure of the sediments to the severe climatic conditions. Quartzose sandstones of the Lee Formation reflect lower rates of tectonic subsidence and greater recycling of sand-sized grains during transportation and temporary deposition on …
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Adhesion and Durability of Coatings on Polypropylene Exterior Sidings
… doesn’t warp, crack, or degrade as easily with extended exposure to the elements, and is cheaper to maintain. However, even plastic siding must be coated. The requirements of a coating for siding are good adhesion, durability, and a suitable appearance. However, polypropylene, like many …
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Insights into the seasonal ecology and thermal biology of the lesser grain borer, Rhyzopertha dominica (Coleoptera: Bostrichidae)
… diet. After harvest, these crops are stored for extended periods, but roughly 10 percent of global grain is lost to insect damage, costing the U.S. alone over 2.5 billion dollars annually. Among the estimated 1,500 insect species that can infest stored grain, the lesser grain borer, Rhyzopertha …
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Erosion-Corrosion of Cr3C2-NiCr High Velocity Thermal Spray Coatings
… composition and microstructure that occur with extended in-service exposure at elevated temperature. In addressing the short comings in the current state of knowledge, the aim of this work was to characterise the mechanism of erosion-corrosion of high velocity sprayed Cr3C2-NiCr thermal spray …