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 13 of 13 for “"Contamination problems"”.
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Laboratory investigation of insulator contamination problems
This thesis deals with the practical aspect of the laboratory examination of contaminated insulators. A technique which gives a pollution curve for cylindrical insulator models is described. The technique is later extended to apply to practical insulator shapes, giving curves which can be used to …
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Finite element analysis of groundwater contamination
… to assist in the understanding of groundwater contamination problems. It was mainly aimed at studying the extent and manner of travel of contaminants in the saturated soil of unconfined aquifers which may be pumped by of wells.
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Secondary Plasma Sources for Ionized Physical Vapor Deposition
… outside the vacuum system, so all shadowing and contamination problems which the other two sources exhibit are eliminated. Ionization fractions to the substrate of 51 +/- 10% with a deposition rate of 847 +/- 42 A/min. are found. Without the antenna, the ionization fraction is 30 +/- 6% and the …
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Remote spectrophotometric water quality monitoring
… there are likely to be sample stability and contamination problems, and the information provided is unlikely to be continuous or immediate.This research focussed on the design and construction of fully automated and portable monitors based on flow injection analysis and incorporating solid …
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Numerical simulation of a single emitter colloid thruster in pure droplet cone-jet mode
… divergence angles to avoid spacecraft (S/C) contamination problems. Colloid thrusters deliver low thrust (0.1 [mu]N/emitter) which can be multiplied many times over by integrating them in microfabricated arrays. An important advantage is that with proper choice of propellant and operating …
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Properties of natural systems and the efficiency of market-based solutions to environmental externalities
… model to solve a management problem of aquifer contamination from highway deicers. I compare my theoretical results to those from previous economic studies of groundwater pollution and describe how my model can provide a framework to evaluate the potential effectiveness of different policy …
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Microbial CR(VI) reduction in indigenous culture of bacteria: characterization and modelling
South Africa currently faces multiple Cr(VI) contamination problems which are unsuccessfully remediated using available technologies. Cr(VI) is highly toxic, carcinogenic and mutagenic in nature and it is exclusively released through anthropogenic activities. A new treatment approach is proposed …
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A New Paradigm Of Modeling Watershed Water Quality
… and decision makers to analyze the impact of contamination problems and to evaluate the efficacy of alternative remediation techniques and management strategies prior to incurring expense in the field. This dissertation presents the conceptual and mathematical development of a general …
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AN INTEGRATED MICROSYSTEM FOR BACTERIAL BIOFILM DETECTION AND TREATMENT
… cause severe infections in clinical fields and contamination problems in environmental facilities. Due to the unique complex structure of biofilms that comprise diverse polysaccharides and bacteria, traditional antibiotic therapies require a thousand times higher concentration compared to …
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Evaluation of spray irrigation as a methodology for on-site wastewater treatment and disposal on marginal soils
… the 60 cm depth showed no potential groundwater contamination problems. Significant increases in chloride concentrations and EC measurements in the subsurface waters at both sites along with little or no increases in nitrate, ammonium, or phosphorus levels indicated that the effluent was being …
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Re-Establishing Bald Eagle and Osprey Breeding Populations in South Dakota Through Hacking: A Feasibility Study
… populations, high human activity, and potential contamination problems were factors that negatively influenced bald eagle and osprey nesting habitat suitability. Suitable bald eagle nesting habitat occurred along the unchannelized Missouri River in southeastern South Dakota below Fort Randall and …
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Determining Sources of Fecal Pollution in Washington D.C. Waterways
… was used to determine sources of fecal contamination in three District of Columbia waterways: Rock Creek, the Anacostia River, and the Potomac River. These three waterways were identified as exceeding water quality standards set for fecal coliform levels and were designated by the …
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The formulation and refinement of a polymerase chain reaction (PCR) assay for early diagnosis of paediatric HIV infection and genetic analysis of variants involved in vertical transmission of HIV-1
… measures that need to be applied to avoid contamination problems. The second part of this study was devoted to DNA sequence analysis of cloned HIV isolates from an infected mother and her 3-month-old infant. Nucleotide sequence variation between isolates of HIV-1 has been well documented. …