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 159 for “"Ultraviolet (UV)"”.
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Photodegradation of biopolymer doped with titanium dioxide (TiO2) as ultraviolet (UV) stabilizer
… focuses on 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 …
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Photodegradation of biopolymer doped with titanium dioxide (TiO2) as ultraviolet (UV) stabilizer
… focuses on 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 …
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Ultraviolet (UV) Laser Implementation, Signal Model, and Measurement Sensitivities in Filtered Rayleigh Scattering for Aerodynamic Flows
… This study explores the implementation of an ultraviolet (UV) FRS system nominally at 387 nm with the use cesium vapor as the molecular filter. The cesium absorption lineshapes (corresponding to the 62S1/2 → 82P3/2 atomic transitions around 387 nm) are considered along with camera …
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Efficacy of Ultraviolet Radiation to Control Lactic Acid Bacteria in Wine Must
The use of shortwave ultraviolet (UV<sub>c</sub>) radiation to control lactic acid bacteria (LAB) in wine production was studied. A simulated wine sterilizer was built using a commercially sourced ultraviolet (UV) sterilizer commonly used in aquariums and ponds. After growing cultures in test …
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Kinetic Modeling of Microbial Inactivation by Ultraviolet Light
Ultraviolet (UV) light reactors are currently being designed for the disinfection of water and wastewater. However, little information is available relating the effects of mixing, light intensity, reaction time, and water quality to UV disinfection efficiency. This study was designed to develop …
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Dynamics of High- and Low -Pressure Plasma Remediation
The use of DBDs as excimer ultraviolet (UV) lighting sources was also studied. The mixture Xe/Cl2 ≈ 99/1 was found to be an optimum gas mixture for the generation of the XeCl*. Higher applied voltage improves both the intensity and efficiency of UV photon generations. The strong attachment at high …
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Copper Complexes Which Catalyze the Air Oxidation of Organic Substrates.
… resonance (pmr) and optical [visible (vis) and ultraviolet (uv)) spectroscopy are often the techniques of choice for studying the reaction. They require a knowledge of pmr and optical spectral parameters. The studies in Part I were carried out to obtain the spectral parameters for future studies.
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Silicon microcavity and microchannel plasma devices: spectroscopy and time-resolved optical experiments
… provided new and efficient sources of visible, ultraviolet (UV) and vacuum ultraviolet (VUV) radiation. The realization of this new platform for devices is implemented through VLSI and MEMS fabrication techniques. In this thesis, the basic physics of plasma discharges is presented, and the …
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Quasar spectroscopy in UV and X-ray- probing the intergalactic medium using helium and oxygen
We employ ultraviolet (UV) and X-ray quasar spectroscopy to study the physical state of the Intergalactic Medium (IGM). First, we quantify the possibility of measuring the temperature of moderately over-dense regions of the IGM at high redshift (z [approx.] 2) using the strongest resonant …
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Flexible and transparent microcavity plasma devices: fabricated by polymer-based replica molding technique
… devices. Best known as the sources of visible, ultraviolet (UV) and vacuum ultraviolet (VUV) radiation, microplasma devices fabricated by replica molding techniques also show potential applications as transparent and flexible displays, a radiation source for medical phototherapy, and photonic …
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Molecular, cellular, and circuit analysis of C. elegans spitting behavior
… known to science. Previous work showed that ultraviolet (UV) light interrupts and modulates the pharyngeal pumping rhythm. This modulation requires the gustatory receptor orthologs lite-1 and gur-3. Because lite-1 and gur-3 control a similar pharyngeal response to hydrogen peroxide, the …
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Manufacturing Strain Sensor Via Printed Electronics Onto 3D Printed Substrates
… of the ink. This optimization includes ultraviolet (UV) time exposure, drop spacing, heating conditions, intense pulsed light parameters, and length shrinkage. A low-cost strain gauge sensor is fabricated onto 3D printed PLA material. The related mechanical/electrical tests are performed …
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Prothonotary Warbler (Protonotaria citrea) Plumage as an Indicator for Infection: the Relationship between Haemosporidia Infection and Breast Feather Reflectance in a Neotropical Migrant Passerine
… Neotropical migrant passerines, throughout the Ultraviolet (UV) and human visible light spectra and examines the relationship between Haemosporidia (pathogen causing Avian Malaria) infection and feather reflectance (n=41). Reflectance was characterized using a Principle Component Analysis …
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Analysis of Light Extraction Efficiency Enhancement for Deep Ultraviolet and Visible Light-Emitting Diodes with III-Nitride Micro-Domes
… next generation of lighting technology such as ultraviolet (UV) / visible light-emitting diodes and laser diodes. The limitation occurred in light extraction efficiency of III-nitride LEDs is attributed to the large refractive index difference between III-nitride semiconductor and free space, …
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UV-curable organic-inorganic hybrid polyurethane coating
… and/or silane) that were cured with a single ultraviolet (UV) trigger but two photo-initiators. Upon UV irradiation, the free-radical initiator initiated a free-radical reaction for acrylate cross-linking, and the photo-latent base initiated a sol-gel reaction for condensation of the silanes. …
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Molecular Dynamics of p21 and Fluorescent Sphingomyelin in Keratinocytes Exposed to UVB
… and the incidence is increasing every year. Ultraviolet (UV) radiation from the sun is the most dominant factor contributing to tumor initiation and progression. The condition is most prevalent in populations with lighter skin and older age. Current pharmaceutical molecular research targets …
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A potential route to hydrogel multifunctionalization utilizing encapsulation of acrylate-conjugated streptavidin
… ratios, along with a gelling polymer under an ultraviolet (UV) lamp. Acryl group conjugation was confirmed through high performance liquid chromatography (HPLC) and mass spectrometry. Protein binding was assayed through the use of rhodamine-labeled streptavidin and fluorescent microscopy. Gels …
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Microfluidic approaches to the synthesis of complex polymeric particles
… the constrained droplets in situ using focused ultraviolet (UV) light from an inverted microscope. The second and more general method called Continuous Flow Lithography (CFL) is a one-phase, projection photolithography based process to continuously synthesize polymeric microparticles in any 2-D …
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Photoinduced wetting kinetics of water on immersed nanoporous titania surfaces with application to oil-water separation
… preferential wetting of water over oil under ultraviolet (UV) irradiation and this provides a mechanism for recovery of fouling. Titania nanoporous surfaces were prepared by depositing TiO2 nanoparticles onto flat substrates using Layer-by-Layer (LBL) assembly, and were then impregnated with …
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Changes in the Distribution of "Acris crepitans blanchardi", with Studies of Nesting Microhabitat and the Possible Impact of Ultraviolet-B Radiation
… its northern extreme. The possible impact of ultraviolet (UV) radiation was tested on six species of amphibian eggs as a possible cause for this decline. These included "Acris crepitans", "Ambystoma", "Bufo americanus", "Hyla versicolor complex", "Pseudacris triseriata", and "Rana pipiens". …
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