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 “"Submergence."”.
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Threshold for complete submergence of Typha domingensis.
The survival of Typha domingensis under complete submergence was investigated by observing and recording vegetation data in a constructed wetland after a natural flood, followed by two controlled experiments designed to simulate deep flood conditions. In the observational study, rhizomes from 750 …
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Submergence as emergence : expanding social waterscapes in a shrinking city
This thesis seeks to reclaim spaces of urban disinvestment by developing alternative forms of contact and connectivity across urban water systems. Framing water as a mode of gathering, this project connects myriad urban realities, peoples, and practices. Alternative forms of linkages provide users …
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Ecological strategies of two Ranunculus species in relation to seasonal submergence
This thesis is concerned with the role of submergence in the ecology of the perennial <i>Ranunculus repens</i> and the annual <i>R. sceleratus</i>, both of which are common in seasonally submerged habitats. Evidence is presented for genetic differentiation between <i>R. repens</i> populations with …
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Diffusion of Three-Dimensional Slot Jets With Deep and Shallow Submergence
To minimize the adverse effects of thermal discharges on the natural environment, several methods are utilized to mix heated discharges with colder receiving water thoroughly and quickly. By discharging the heated water with high initial velocity it behaves like a non-buoyant jet. The velocity …
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Subsurface controls on mainland marsh shoreline response during barrier island transgressive submergence
<p>Many recent studies have sought to understand the response of barrier islands and their attendant marshes to sea level rise. The Mississippi River delta plain, specifically the Chandeleur Islands and associated interior wetlands in eastern Louisiana, serves as an excellent natural laboratory for …
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Physiological, Metabolic, and Transcriptional Analysis of Submergence Tolerance in Rice and Nitrogen Use Efficiency in Wheat
… production worldwide. Using the key regulator of submergence tolerance in rice, SUB1A, as a model, we have advanced our understanding of how plants coordinate transcriptional, hormonal, and metabolic responses to submergence. However, the contribution of SUB1A to recovery from sublethal …
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Effect of impeller submergence on power dissipation and solids suspension in mixing systems equipped with pitch-blade turbines
… the liquid level was lowered, and the impeller submergence S_b changed as a result were determined for the case of a six-blade, pitch-blade turbine (6-PBT) impeller. The power consumed by the impeller was also measured. It was found that when a critical impeller submerge level was reached it was …
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Effects of the USS Thresher disaster upon submarine safety and deep-submergence capabilities in the United States Navy
… highlighted the need for greatly improved deep-submergence capabilities within the fleet. Subsequently, deep-ocean search, location and recovery assets were developed, as well as improved deep-sea rescue capabilities.
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Stream aufwuchs accumulation
… slides was generally lower after shorter submergence times than after longer times. In disturbance frequency experiments carried out during Phase I, Aufwuchs accumulation depended on the frequency of copper disturbance. Accumulation was faster in the low stress streams (LSS) than in the …
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Cyclic peritidal facies of a Cambrian aggraded shelf: elbrook and conococheague formations, Virginia Appalachians
… causing cyclic transgressions (max. 3 m initial submergence). Average cycle duration was 60,000 years. Cycles (1-7 m thick) are composed of basal subtidal/intertidal limestone consisting of bioherms, grainstone and ribbon carbonate; and dolomitic laminite caps containing minor quartz arenite, …
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The role of sediment supply and sea-level changes on a submerging coast, past changes and future management implications
… Island-building occurred during Holocene submergence along with other radical changes to the shape and form of the coastline, all reflecting the changing dominance between the three controlling factors. The accepted outcome of submergence is transgression and fragmentation of islands …
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Die drenkeling in die werk van D.J. Opperman, met spesiale verwysing na Joernaal van Jorik
… carries the joint connotations of drowning or submergence and decline. The condition of decline indicates the disappearance of the drowning figure below the water-line or surface. Such alienation can also be brought about by means of other elements which can become the metaphorical equivalent …
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Single and multiphase mixing in partially filled stirred vessels
… desired process objectives. When the impeller submergence is reduced as a result of lowering the liquid level, the fluid dynamics of even a single-phase stirred liquid can become quite complex, with different regimes possibly existing depending on the geometric characteristics of the system …
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Evolutionary influences on the reduction in enzootic circulation and human incidence of western equine encephalitis
… surrounding a reduction in virus activity, or submergence, must also be studied. Western equine encephalitis virus (WEEV) provides a unique case study on how submergence can be understood by observing evolutionary and ecological factors. WEEV caused several epizootic events in the early 20th …
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Flow over large-scale low-order topographies: impact of heterogeneities
… flow over the canopies was studied under various submergence depths common in riverine environments. Here, the submergence depth is defined as the ratio of the flow depth to the canopy height. Turbulence statistics complemented with quadrant analysis and proper orthogonal decomposition reveal …
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Observations on myxozoans (Myzozoa: Myxosporea) and the spatial and temporal variation in parasite assemblages of the nosestripe klipfish, Muraenoclinus dorsalis Bleeke, 1860 (Perciformes: Clinidae)
… rather push up the tide thereby extending the submergence period of M dorsalis. A longer period of submergence may provide parasites with increased opportunities to infect a host. Nestedness analysesconfirmed a nested subset structure in all component communities, likely a result of …
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Sm-Nd and C-isotope chemostratigraphy of Ordovician epeiric sea carbonates, midcontinent of North America
… Midcontinent seawater. As sea level fluctuated, submergence of the Arch and an influx of Iapetus ocean waters adjusted the Nd isotope balance of epeiric seawater. As a result, eNd profiles can be used to track the submergence history of the Late Ordovician Midcontinent. Comparison of …
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