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 290 for “"UV light"”.
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Impact of Artificial UV Light Sources on the Skin
UV radiation has the ability to cause erythema, photoaging and photo-cancer. In 2010 Westminster wanted information on sources of artificial UV radiation in particular sunbeds. The objective of this study was to measure the spectral outputs from artifcial tanning units throughout England and to …
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UV light inactivation of adenovirus, coxsackievirus and murine norovirus
… of low-pressure (LP) and medium-pressure (MP) UV light irradiation to inactivate waterborne pathogens that are an increasing concern in drinking water. The inactivation of pathogens depends directly on the total UV dose or fluence (UV intensity multiplied by contact time) received by the …
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Biofilm Control Inside Secondary Water Storage Containers Using UV LIght
… investigates the feasibility of ultraviolet (UV) light treatment for biofilm control inside secondary storage containers used in humanitarian settings. A scoping literature review investigating real‑world UV light treatment application revealed that, even though it is effective beyond …
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The Effectiveness of Prophylactic Eye Drops on the Reversal of UV-Light Induced Cataracts
… and exposed to ultraviolet radiation, UVB and UVC. They were divided into four groups (n = 32), three of which had cumulative exposures of 5,495 minutes (Group A), 8,810 minutes (Group B), and 13,250 minutes (Group C). The control group received no UV exposure. After UV treatment, each …
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Characterization of DNA-repair potential in deep subsurface bacteria challenged by UV light, hydrogen peroxide, and gamma radiation
… Science Program were tested for resistance to UV light, gamma radiation and H₂0₂. Some deep subsurface bacteria were resistant to UV light, demonstrating ≥1.0% survival at fluences which resulted in a 0.0001% survival level of E. coli B. The percentage of UV resistant aerobic subsurface …
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The synthesis and in vivo evaluation of chemically modified siRNAs that contain red-shifted internal azobenzene derivative spacers for selective and tunable photocontrol of activity without UV light
… siRNAs to be reversibly controlled with UV (ultraviolet) light after transfection into the cells was investigated. Next, utilization of tetra-halogenation at the ortho position on the azobenzene to red-shift the π→π* of the N=N double bond out of the UV portion of the electromagnetic …
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Inactivation mechanisms of adenovirus from exposure to polychromatic ultraviolet light irradiation
Ultraviolet (UV) light is a drinking water treatment technology that has gained popularity as an alternative to control chlorine-resistant pathogens and comply with regulations on disinfection byproduct formation. Human adenovirus (HAdV) is found in water sources around the world and can cause …
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A Comparison of Ultraviolet Light and White Light in the Detection of Adhesive During Orthodontic Debonding: An In-Vitro Study
Purpose: To assess the accuracy and efficiency of UV illumination compared to conventional white light in the detection of adhesive during orthodontic debonding.Materials and Methods: A pilot investigation was first done to evaluate different orthodontic adhesives for inclusion in the main study. …
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Photocatalytic Reactor using TiO2 Thin Film on Quartz Tubes
… using TiO2 slurry and thin film, using a UV light source, the constraints for these reactors are the need for the removal of TiO2 particles at the outlet stream in a slurry reactor and poor environment for the efficient use of TiO2 film using UV light, as the UV light penetration depth in …
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The Physiological and Behavioural Consequences of Reduced Scalation in Captive-bred Phenotypes of the Bearded Dragon (Pogona vitticeps Ahl 1926)
… lepidosaur scale forms a barrier to ultraviolet (UV) light. Thirdly, there is evidence to suggest that rate of evaporative water loss influences behavioural thermoregulation in lepidosaurs. Lepidosaurs with higher rates of evaporative water loss should be expected to choose cooler temperatures …
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Oxidation of trace organic impurities in ultrapure water by UV and ozone
… of trace organic impurities by the treatment of UV light alone, ozone alone, and the combination of UV light and ozone in ultrapure water is discussed. Eighteen model compounds are chosen as the representative organic contaminants. Significant synergistic removal effect by the oxidation of the …
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Intact and Damaged DNA and their Interaction with DNA-Binding Proteins: a Single Molecule Approach
… study of long DNA molecules that carry UV-light photolesions at random sites. An exposure of DNA to UV light introduces different modifications to the DNA structure: regions of unpaired DNA of different lengths, sharp kinks, the presence of knot like structures and single-strand breaks. …
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Kinetics and Mechanisms of Human Adenovirus 2 Inactivation With UV and Chlorine
… method of irradiation by ultraviolet (UV) light is largely ineffective against adenoviruses. Research is therefore required to find whether any of the other commonly-used treatments, separately or together, can be effective against this threat. I therefore tested the efficacy of …
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Development of novel indicators
… systems for measuring the dose of erythmal UV light have been developed. The first system is of a viologen salt, preferably benzyl viologen chloride, dissolved in poly(vinyl alcohol). This viologen dosimeter responds clearly to different wavelengths and intensities of UV light, although the …
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Photovoltaic Properties of Ferroelectric Thin Films
… application. The effects of film thickness and light intensity on the ferroelectric film were investigated in this project by characterizing the photovoltaic properties, including photocurrent and photovoltage under UV light illumination. The dynamic responses of photocurrent and photovoltage of …
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Photodegradation of biopolymer doped with titanium dioxide (TiO2) as ultraviolet (UV) stabilizer
… the resistance of the biopolymer to ultraviolet (UV) light exposure. The virgin oil (VO) and waste oil (WO) was converted into biomonomer. By adding biomonomer with an appropriate amount of 4, 4’-methylene diphenyl diisocyanate (MDI) and solvent, the virgin oil polymer (VOP) and waste oil polymer …
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Photodegradation of biopolymer doped with titanium dioxide (TiO2) as ultraviolet (UV) stabilizer
… the resistance of the biopolymer to ultraviolet (UV) light exposure. The virgin oil (VO) and waste oil (WO) was converted into biomonomer. By adding biomonomer with an appropriate amount of 4, 4’-methylene diphenyl diisocyanate (MDI) and solvent, the virgin oil polymer (VOP) and waste oil polymer …
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Reactions of a super-electron donor with diarylcyclopropanes and epoxides
… is, the harsher the conditions are. The use of UV-light was necessary to achieve reductive cleavage of the unsubstituted 2,3-diphenyloxiranes. In the case of 2,3-bis(4- chlorophenyl)oxirane, partial reductive cleavage of the aryl C-Cl bond was also observed. Dichloro- and monochlorostilbenes …
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Studies on the novel detection and destruction of the enteroparasite Giardia lamblia and other veterinary problematic microorganisms examined under varying culture conditions
… for evaluating the efficacy of using pulsed UV light for treating G. lamblia parasites. This study aims to provide a source of data into novel disinfection mechanisms such as Pulsed UV light technologies as a potential clinical application in veterinary practice. Methods & Results: Biofilms …
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Experimental investigation of photocatalytic hydrogen production with boron-doped TiO2 and multi-walled carbon nanotubes-TiO2
… which splits water to hydrogen and oxygen by UV light irradiated boron-doped TiO2 and carbon nanotube-TiO2 semiconductor photoelectrodes. The average current densities generated under potentiostatic scan for uncoated stainless steel, boron-doped TiO2 and carbon nanotube-TiO2 working electrodes …
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