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 26 for “"hydrocarbon contamination"”.
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Assessment of Petroleum Hydrocarbon Contamination In Terrestrial Ecosystems Using Conventional and Novel Approaches
Petroleum hydrocarbon (PHC) contamination has emerged as a pressing global concern, due to its impacts on human health and ecosystems, and presents a major challenge for remediation efforts. The heterogeneous nature of PHC mixtures and natural weathering processes that influence the bioavailability …
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Assessment of exposure and effects associated with polycyclic aromatic hydrocarbon contamination in south Chattanooga, Tennessee
… industrial waste in this area h as lead to the contamination of Chattanooga Creek and soil of the surrounding floodplains. Many polycyclic aromatic hydrocarbons (PAHs) are found in these areas, specifically the 16 PAHs the EPA and ATSDR consider to be priority pollutants. The close proximity of …
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The evaluation of liquid hydrocarbon contamination of soil around petrochemical tank farms at a Durban refinery
Submitted in fulfilment of the requirements for the Degree of Master of Technology: Chemistry, Durban Institute of Technology, Durban, South Africa, 2004.
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Root adaptive responses of tall fescue (Festuca arundinacea) growing in sand treated with petroleum hydrocarbon contamination
… that are contaminated with polycyclic aromatic hydrocarbons (PAHs), especially low molecular weight, mobile PAHs such as naphthalene pose a significant challenge to this. Plant roots growing in these soils exhibit changes to their structure, physiology and growth patterns. Tall fescue (Festuca …
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Methodologies for the analysis of petroleum hydrocarbons extracted from contaminated soils
… developing standard methods for the analysis of hydrocarbon contamination of soil, and establishing a more scientific basis for commercial operations has been addressed in this thesis. In particular, problems associated with establishing TPH and BTEX analysis have been critically examined with a …
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Techniques for Reducing Beam-Induced Damage in Electron Microscopy
… to understand the effects of beam shift and hydrocarbon contamination in multipass microscopy and the limit they place on the choice of sample in this scheme. This experiment would be the first demonstration of contrast enhancement due to multipassing in an electron microscope.
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Assessing Various Technologies to Remediate a Hydrocarbon Contaminated Aquifer
… remedial strategies to reduce dissolved hydrocarbon contamination in aquifers, and therefore serve as tools to aid environmental managers in the remedial decision making process. A fuel distribution terminal in the Eastern United States was selected as the test site. A release of diesel …
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Towards improving the quantum coherence in Ion microtraps
… in microfabricated traps are presented. Surface contamination, noise on DC sources and instabilities in magnetic field are all potential sources of decoherence that are investigated. Spectroscopy on a single ion aswell as a two ion string using 88Sr+ is then demonstrated. Hydrocarbon …
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Substrate cleaning using a remote hydrogen rf-plasma
… layer (the so-called native oxide layer) and a hydrocarbon contamination layer that must be removed before growing an epitaxial film of good quality. In this work, low temperature remote rf-hydrogen plasma cleaning of II-VI and silicon semiconductor surfaces was investigated as a preparation for …
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Characterisation of surfactant-expressing bacteria and their potential bioremediation properties from hydrocarbon-contaminated and uncontaminated soils
… was to characterise the bacteria isolated from hydrocarbon-contaminated soils in the UK and Nigeria that express biodegradation properties. The specific objectives were to isolate and characterise surfactant-producing bacteria from various soils, and to identify lipase-producing bacteria for …
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Aging Effect in the Wettability of Nickel Nanorod Arrays
… in hydrophobicity may be due to oxidization and hydrocarbon contamination, which depend on the nanorod morphology. X-ray photoelectron spectroscopy results indicate that thinner samples (10-55 min. deposition time) have more adsorbed carbon as compared to thicker samples (60 and 90 min.). It …
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Hydrogeology and Chemical Characterization of Hydrocarbon in Domestic Water Wells, Rancho Villa Subdivision, Rogers, Arkansas
… Arkansas where several residents have had hydrocarbon contamination in their domestic water wells. The goal of this project was to understand the hydrogeology in the study area, characterize the contaminant chemically, and determine the source of the contaminant. The hydrogeology of the …
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Detection and attribution of drought and oil-induced plant stress using hyperspectral remote sensing
… in vegetation caused by both drought stress and hydrocarbon contamination of the soil. Spectral and plant biochemical measurements were taken from an in-situ field experiment and a glasshouse experiment at the James Hutton Institute, Invergowrie, U.K. The in-situ field experiment was part of an …
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The development of methods and equipment for the study of the aerating capabilities of a microdispersion of air in water
… advances has taken its toll on the environment. Hydrocarbon contamination of the subsoil and groundwater has become a major problem facing scientists and environmentalists in the 20th century. Initial treatment of contamination sites include the removal of the contaminant from the subsurface for …
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Urban wastewater treatment with mature constructed wetlands
… when high shock loads, such as petroleum hydrocarbon spills, are subjected to the system. Contamination with petroleum hydrocarbon compounds results in changing the structure, function and ecosystem service values of wetlands, which can eventually lead to clogging of the wetland substrate …
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LITHOLOGIC AND HYDROGEOLOGIC CONTROLS ON THE OCCURRENCE, TRANSPORT, AND FATE OF MTBE IN FINE GRAINED GLACIAL-LACUSTRINE SEDIMENTS
… extending under Highway 93, with dissolved phase contamination (including MTBE) extending 460 m west to Spring Creek. Though geochemical sampling has established the general plume extent, the influence of aquifer heterogeneities on plume position and transport behavior is poorly described. The …
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LITHOLOGIC AND HYDROGEOLOGIC CONTROLS ON THE OCCURRENCE, TRANSPORT, AND FATE OF MTBE IN FINE GRAINED GLACIAL-LACUSTRINE SEDIMENTS
… extending under Highway 93, with dissolved phase contamination (including MTBE) extending 460 m west to Spring Creek. Though geochemical sampling has established the general plume extent, the influence of aquifer heterogeneities on plume position and transport behavior is poorly described. The …
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Conjugated dithiols as model systems for molecular electronics: assembly, structure, and electrical response
… of SAu bonds at the charge transfer nterface. Hydrocarbon contamination on the Au electrodes left by the elastomeric stamp during transfer masked any electrical response from QPDT. It is therefore crucial to ensure the pristine quality of the electrical contact in order to reliably measure the …
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Removal of organic contaminants from lithographic materials
… amount of photon loss for illumination, however contamination in the sys- tem is unavoidable, especially due to carbon growth on the multilayer mirror collectors and to soft defects in the form of organic contamination on the mask. Traditional cleaning methods employ the use of wet chemicals to …
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