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 17 of 17 for “"Ultra-violet light"”.
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The effect of ultra-violet light on thermophilic bacteria in sugar
Thesis: B.S., Massachusetts Institute of Technology, Department of Industrial Biology, 1935
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The Identification of Composite Resin Restorations within Natural Teeth
… restorations, including dyes, acid-etching, ultra-violet light (UVL), and Quantitave Laser Fluorescence (QLF). As enamel, dentine and composite resin all have different fluorescent properties, ultra-violet light (UVL) has been of particular interest as a method of detecting the presence of …
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Some aspects of quinonoid chemistry
… of these alkylamino - p -benzoquinones with ultra-violet light gave benzoxazoles where an á -hydrogen atom was present in the alkylamino substituent, except for the cyclohexylamino - and s - butylamino - benzoquinones which gave an unstable photo-product. With t - butylamino - benzoquinone no …
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Design and Evaluation of a Portable Ultra-Violet Microbial Disinfection Chamber
… and are currently in use. This thesis utilizes Ultra-violet light to eradicate the bacteria. A portable unit was constructed that contains the light bulb and fan. Two different trials were conducted: Controlled Laboratory trials and Fish Culture Room Trials. The Controlled Laboratory Experiments …
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Plasma Treatment of Zinc Oxide Thin Film and Temperature Sensing Using the Zinc Oxide Thin Film
… the zinc oxide coated glass as sensing element, ultra-violet light emitting diode as light source, and a ultra-violet photodiode as light detector. Short circuit current of the photodiode was measured over a range of the zinc oxide film’s temperature. The short circuit current decreased linearly …
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Automated techniques for surface coating deterioration studies
… nitric oxide stabilises degradation caused by ultra-violet light. The computer was used extensively to superimpose goniophotometric curves to isolate individual deteriorative influences on the degradation of the coatings.
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Structure and Properties of Polymer Blends
The mechanical properties, morphology, light and thermal stability of pure polymers (eg LDPE, PP etc) and blends of PE/PVC, PE/PP and PE/PS with and without additives have been studied using a variety of physical and chemical techniques. The change in mechanical properties occurring during the …
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Behavioural and ecological interactions between Heliconius butterflies, their predators and host plants
… suggests that having the ability to see in the ultra-violet light range enables higher discrimination between co-mimics both for birds and butterflies. Heliconius warning colours transmit a consistent signal across time of the day and habitat in a tropical forest for avian vision. In contrast …
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Quantifying the Effects of Aging on the Mechanical Properties of Medical Grade Polycarbonate and UV Cured Adhesives
… polymer, and is often used in connection with ultra-violet light (UV) cured adhesives. Because of the chemical complexity of polymers, little is known about their actual aging characteristics. By characterizing the effects of aging, storage environment, and sterilization on medical grade …
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Modification of the mechanical properties of synethetic hydrogels by various techniques
… and suitable solvents, and then exposed to ultra-violet light. Filled hydrogels were formed by adding quantities of a PMMA dispersion in IMS to the hydrogel polymerisation mixture. The properties which represent best the level of mechanical reinforcement are the tear strength or tearing …
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Synthetic Applications Of The Photochemical Cycloaddition Reactions Of N-acylindoles And Conformational Studies Of The Cycloadducts
… to yield cyclobutane dimers when irradiated with ultra-violet light. Attempted generation of the N-unsubstituted indole dimers from the photodimers by removal of the N-substituents was unsuccessful and led to decomposition to indole and N-acylindole. This implies that the N-unsubstituted indole …
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A techno-economic study of the recycling of mixed plastics to useful products
… arisings from retailing, building, automotive, light engineering and chemical industries have been surveyed by mans of questionnaires and interviews. This was partially successful and indicated that very considerable quantities of relatively clean plastics packaging was available in major …
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Towards the ecology and conservation of sand lizard (Lacerta agilis) populations in Southern England
… observed basking in a preferred range of ultra-violet light and post-mated they favoured conditions where the ground surface temperature ranged between 17.5oC and 27.5oC.<br/><br/>An intensive capture-mark-recapture study was performed on independent sand lizard populations and pattern …
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TiO2 and ZnO metal oxides lattice defects driven magnetism and their contribution in discoloring of dyes
… were tested for photocatalytic activity under ultra-violet light. On the other hand, pure and manganese (Mn) ion-doped TiO2 films were grown by pulsed laser deposition under vacuum at different substrate temperatures 350 and 580 ºC for 50 min each. The concentration of the Mn in TiO2 films was …
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Chemistry of hydroxycinnamate esters and their role as precursors to Dekkera produced off-flavour in wine.
… formation of ethylphenols. The research highlighted within this thesis examines the potential role of a number of esterified conjugates in the production of ethylphenols by D. bruxellensis. Two classes of berry derived esters, the tartaric acid and glucose bound hydroxycinnamates, as well as …
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Phase-Matching Optimization of Laser High-Order Harmonics Generated in a Gas Cell
… foil near the laser focus. Counter-propagating light is used to directly probe where the high harmonics are generated within the laser focus and to investigate phase matching. The phase matching under optimized harmonic generation conditions was found to be unexpectedly good with phase zones …