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 15 of 15 for “"simulated sunlight"”.
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Persistence of Bacteroides ovatus under simulated sunlight irradiation
… indicator bacteria species, was evaluated under simulated sunlight exposure and conditions similar to surface water and seawater. By combining propidium monoazide (PMA) treatment and quantitative polymerase chain reaction (qPCR) detection, the decay rates of B. ovatus were determined in the …
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Hydroxyl radical production via the photo-Fenton reaction in natural waters
… model systems and natural water samples with simulated sunlight and measuring both H202 accumulation and OH' production in the presence and the absence of Fe reactions. Using these data, a model was developed to calculate the potential impact of the photo-Fenton reaction in sunlit natural …
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Fundamentals of heterogeneous photocatalysis ; and, Consequences of inorganic and organic UV sunblocks on DNA
… lotions as a physical filter to block UVA/UVB sunlight radiation, designed to protect people from sunburns and skin cancers. The thesis is two-dimensional. Part A deals with fundamental studies of photocatalysis. Part B addresses more practical considerations of the use of titanium dioxide in …
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Environmental-Stress Tolerant Formulations of Metarhizium anisopliae var. acridum for Control of African Desert Locust (Schistocerca gregaria)
… the effects spore coating on spore-tolerance simulated sunlight; and 6) testing the effects of spore coating infectivity to Schistocerca americana. Aerial conidia, submerged conidia, and blastospores produced in a high-osmolality liquid medium all had high desiccation tolerance relative to …
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Characterization of the insecticidal crystal protein from Bacillus thuringiensis.
… preparation. Exposure of the protein crystal to simulated sunlight results in a loss of toxicity and in the destruction of the side-chains of tryptophan, histidine, tyrosine and methionine. Destruction of amino acid side-chains is not the primary cause of the photo-inactivation of the protein …
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Photochemistry of Polycyclic Aromatic Hydrocarbons with Environmentally Relevant Metals
… the work presented in this dissertation focus on simulated reactions in the atmosphere and water systems between persistent aromatic compounds and varying species of metals with an emphasis on iron. Bulk water suspensions of a standard soil and polycyclic aromatic hydrocarbons (PAH) were analyzed …
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Roles of singlet oxygen and triplet excited state of dissolved organic matter formed by different organic matters in bacteriophage MS2 inactivation
… species (ROS) produced by irradiation with simulated sunlight, containing visible light and ultraviolet light with wavelengths greater than 320 nm, was investigated. The results from experiments with synthetic sensitizers Rose Bengal, 3'methoxyacetophenone, and nitrite suggested that singlet …
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Solar energy collection using vee-grooved surfaces
… For that purpose, the specimens are exposed to simulated sunlight, and their effective absorptances, as well as their absorption efficiencies, are determined by a calorimetric method. The highlights among the results are: 1. V-grooves - carefully optimized and applied to a solar energy absorbing …
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Experimental investigation of a catalyst under various solar light conditions for hydrogen production.
… spectrum LED light source and one sun intensity simulated sunlight. Variation in the absorption characteristics from both the previously published monochromatic values and from each other is observed. absorption characteristics are dependent upon the type of light used and that specific testing …
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Iron-Doped Titanium Dioxide Nanomaterials: Synthesis, Characterization and Photodegradation Catalytic Behavior
… TiO2 and pure TiO2 photocatalysts under simulated sunlight. The measurements are performed at two pH values and the different mechanism observed can be explained in terms of changes in the materials potential of zero charge (PZC) and how surface charge affects the dye adsorption. Using …
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On the non-microbial sources and sinks of dissolved metabolites in seawater
… techniques’ suitability for such experiments. In simulated sunlight, 11 of 57 metabolites decayed to some extent in artificial or natural seawater, and tryptophan and kynurenine may decay rapidly in the mixed layer of an oligotrophic ocean. For Chapter 3, I captured five species of migratory …
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Titania-based nanocomposites for solar photocatalysis
… for degradation of aqueous methylene blue under simulated sunlight compared to pristine TiO$_2$. Particle size of the best performing TiO$_2$-C catalyst was further reduced through hydrolysis with aqueous KCl. The resulting nanoparticles (~10 nm) displayed a comparable rate of photodegradation …
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Abiotic and Biotic Polymer Degradation to Inform Sustainable Design
… polymer degradation by up to two-fold. Simulated sunlight notably enhanced polymer degradation by mobilizing dissolved organic carbon (DOC), which proved highly biodegradable in marine environment. Chemical structural differences were clearly linked to degradation behaviors, emphasizing …
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On the non-microbial sources and sinks of dissolved metabolites in seawater
… techniques’ suitability for such experiments. In simulated sunlight, 11 of 57 metabolites decayed to some extent in artificial or natural seawater, and tryptophan and kynurenine may decay rapidly in the mixed layer of an oligotrophic ocean. For Chapter 3, I captured five species of migratory …
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The role of copper in aquatic photochemistry of dissolved organic matter
… terrestrial and microbially derived DOM) under simulated sunlight irradiation. By using ultra-high resolution mass spectrometry, the results indicated that Cu selectively inhibited the photooxidation of lignin- and tannin-like phenolic moieties present in DOM by reducing the phenoxyl radicals …