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 65 for “"water control"”.
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Mathematical madel for screening storm water control alternatives.
Thesis: M.S., Massachusetts Institute of Technology, Department of Civil Engineering, 1972
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Unsteady flow in the Third Navigation Channel, Gezhouba Water Control Project, China
… in the Third Navigation Channel at the Gezhouba Water Control Project, China, has been developed. The model has been calibrated and verified using the prototype test data. All conceivable factors affecting wave propagation have been studied parametrically. The side discharge method is considered …
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Groundwater management using a GIS case study : Uitenhage Subterranean Government Water Control Area
… the centre of one of the biggest artesian groundwater basins in South Africa. The Table Mountain Group quartzitic sandstones are overlain by a thickness of postPalaeozoic sediments giving rise to artesian groundwater. The most wellknown of this manifestation are the springs at Uitenhage which …
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Learning of Dietary Cues By Embryos and Larvae of Ringed Salamanders (Ambystoma Annulatum)
… Embryos were exposed to brine shrimp or a water control. After hatching, behavior of larvae was quantified following exposure to brine shrimp and to a novel scent (melon). Larvae that were exposed to brine shrimp as embryos were more attracted to both stimuli and contacted the brine shrimp …
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Relationships among spread-sticker application, blossom cap retention, berry scarring, thrips populations, and Botrytis bunch rot in 'Chardonnay' grapes, and a survey of pesticide use and pest severity in Virginia vineyards in 1990 and 1991
… retention. At bloom, the sticker Nu-Film 17®, or water (control), was sprayed onto single clusters at diluted ( 0.63 ml/ L ) and concentrated ( 1.26 ml/L ) label rates. After fruit set, some clusters were cleaned of caps and other flower parts with pressurized air. Cap and debris retention, berry …
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Sediment Delivery from Reopened Forest Roads at Stream Crossings in the Virginia Piedmont Physiographic Region, USA
Efforts to control surface runoff and erosion from forest roads at stream crossings are critical for the protection of aquatic ecosystems in forests. In this research, annual and event-based sediment delivery rates were estimated for reopened legacy roads at forest stream crossings in the Virginia …
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The Survival and Growth of Fish in a Settled Industrial-Domestic Effluent
… toxicity (Brown 1968) were used to describe water quality of test treatments at intervals over a three year period. Copper was the principal poison, zinc, ammonia and phenol being only occasionally important. Investigations were conducted in three test treatments: tap-water (control) 50% and …
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Occupancy and Detection Rates of Salamanders in Association with Altered Water Regimes at Mingo National Wildlife Refuge in Southeastern Missouri
… Refuge in southeastern Missouri, extensive water control mechanisms have resulted in an ecosystem with an altered hydrologic cycle. In order to determine whether these wetlands provide adequate resources for amphibians, I set traps on wetlands during 2011 and 2012. I also collected data on …
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The Effects of Gibberellic Acid, Smoke Water, and Cold Stratification on the Germination of Native Perennial Seed
… as well as four chemical solution treatments—water (control), gibberellic acid, smoke water, and gibberellic acid with smoke water. Seeds were evaluated and counted twice a week. Of the twenty evaluated species, sixteen had germination rates over 3% or 1 seed out of 30. Stratification …
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Efficacy and impact of sanitizers in controlling pathogenic bacteria on irrigation water
Irrigation water quality is crucial for fresh produce. However, the absence of practical microbial water standards and EPA-registered sanitizers poses challenges for growers, impacting food security and increasing the risk of foodborne outbreaks. This study compared the effectiveness of commercial …
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Development of a lithium hydride powered hydrogen generator for use in long life, low power PEM fuel cell power supplies
… hydrogen through a chemical reaction with water. Control of the lithium hydride hydrolysis reaction is investigated. Active and passively-controlled hydrogen generators that rely on lithium hydride are designed and experimentally studied. A model is created to explain the system's pressure …
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Groundwater effects of land applied alum residuals
… into the topsoil. A weekly dose of rainwater was applied to each column over a six month period. Leachate and soil constituents were analyzed to evaluate migration of specific constituents from the alum residuals through the soil profile and into the groundwater. Soil analysis indicated …
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Salmonella Internalization From Contaminated Seeds or Irrigation Water in Greenhouse Tomatoes
… treated with Salmonella contaminated irrigation water or grown from contaminated seeds. Greenhouse grown tomato plants were placed into eight different groups. Groups one through six consisted of five plants each and were treated with 350 ml of 10^6 Salmonella contaminated irrigation water over a …
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Water First : a political history of hydraulics in Vietnam's Red River Delta
… agriculture system? And what role did poor water control infrastructure play in creating such a situation?¶ I answer these questions by examining the historical patterns of hydraulic development in northern Vietnam from the beginning of the 19th century until the introduction of the …
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Water First : a political history of hydraulics in Vietnam's Red River Delta
… agriculture system? And what role did poor water control infrastructure play in creating such a situation?¶ I answer these questions by examining the historical patterns of hydraulic development in northern Vietnam from the beginning of the 19th century until the introduction of the …
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Effects of Experimental Flooding Regimes on the Seasonal Carbon and Nitrogen Budgets of Silver Maple (Acer Saccharinum) and Speckled Alder (Alnus Incana Ssp. Rugosa)
… flooding regimes can expose wetlands to soil waterlogging during any part of the growing season. Carbon and nitrogen budgets of dominant riparian woody species may be seriously impacted when flooding occurs after the normal spring flood period. To better understand this process, I exposed …
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Three screening tests used to evaluate groundwater quality
… emergence of the critical problem of groundwater contamination due to materials leaching from toxic waste disposal sites and other sources has had a sobering impact on society. The rash of unexpected contamination has led to a plethora of legislation designed to address this problem. Along …
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Flow Reversal Events Increase the Abundance of Nontroglobitic Fish in the Subterranean Rivers of Mammoth Cave National Park, Kentucky
… by the Green River, one of the most speciose watersheds on the continent. Cave springs create a direct aquatic link between subterranean waterways and the Green River. The history of these subterranean river systems is filled with eyewitness reports of various species of surface water …
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Characterization, utilization and treatment of mechanized clam processing wastes
In response to water quality deterioration caused by clam processing effluent, the Virginia State Water Control Board is imposing much greater effluent discharge limitations on the industry. Meeting these limits will require increased wastewater treatment and decreasing the water volume of water …
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