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 51 for “"angular dependence"”.
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Understanding disability glare: the effects of scattered light on visual performance
… eye. Scattered light varies in both amount and angular dependence, outcomes that relate directly to the number and size of particles involved. In this respect, scattered light is estimated using two methods: one that measures both the amount and the angular dependence of scattered light and the …
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Radial, vortex, and spiral solutions to the nonlinear Schrödinger equation and other reaction--diffusion systems
… are investigated: radial solutions (with no angular dependence), vortex solutions (with angular dependence but no radial phase dependence), and spiral solutions (which have radial phase dependence). The study considers free particles without potential and trapped particles inside the …
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Characterization of Optically Stimulated Luminescent Detectors In Photon & Proton Beams For Use In Anthropomorphic Phantoms
… pelvic phantom was used to test the angular dependence of OSLDs in photons and protons. A cylindrical insert in the phantom allows the dosimeters to be rotated to any angle with a fixed gantry angle. OSLDs were irradiated at 12 angles between 0 and 360 degrees. The OSLDs were read out …
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Development and Implementation of The Use of Optically Stimulated Luminescent Detectors In The Radiological Physics Center Anthropomorphic Quality Assurance Phantoms
… dosimeters (OSLDs), but a problem lies in the angular dependence exhibited by the OSLD. The purpose of this study was to characterize the angular dependence of OSLD and establish a correction factor if necessary, to provide accurate dosimetric measurements as a replacement for TLD in the QA …
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The Mossbauer effect of FE57 on the surface of tungsten
… The assymmetry of the surface spectra, the angular dependence of the shape, and the magnitude of the splitting of the two surface lines indicate an electric field gradient at the surface of 2.4 x 10 16 V/cm 2 directed along the normal. An effective Debye temperature of 406 + l2°K is found …
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Oxygen-17 nuclear magnetic resonance studies of high-temperature superconductors
… Measurements of the angular dependence of the oxygen frequency shifts and corresponding satellite transitions have enabled us to assign the oxygen sites of magnetically oriented YBa$\sb2$Cu$\sb3$O$\sb{\rm 7-x}$, as well as determine the e.f.g. parameters for various …
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Field induced switching in multilayer rhombic magnetic rings
… (GMR). Contact configuration and angular dependence of applied field are also examined. Using submicron thickness rhombic rings with long axis dimension -1.5gjm, major loop magnetization sweeps were conducted, as well as minor loops in order to excite several resistance states …
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Reduction of Line Edge Roughness in Semiconductor Photoresist by Means of a Grazing Incidence Ion Beam
… numbers Variables include beam energy and angular dependence. LER measurements are taken using Hitachi image analysis software on top-down analytical SEM measurements.
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Anisotropic spin-lattice relaxation times of trivalent rare earth ions in anhydrous lanthanum trichloride
"Measurements of the temperature and angular dependence oft,he spin-lattice relaxation time Tl have been made for cerium, praseodymium, neodymium, samarium, terbium, and erbium , in single crystals of anhydrous lanthanum tric~loride. The experiments were performed on samples cqntaining ~ 2 at.% …
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Kinetics modeling and 3-dimensional simulation of surface roughness during plasma etching
… chemical processes into the 3-D simulator. The angular dependence on etching yield was modeled based upon the mixing layer kinetics model. All the rate coefficients fitted previously at normal ion incidence were kept constant without any further optimization. The angular curves were assigned to …
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A Model of Energy and Angular Distributions of Fluxes to the Substrate and Resulting Surface Topology for Plasma Etching Systems
… such as specular reflection and energy and angular dependence of etch yield, involved in the shaping of the etch feature. Parameterization of these mechanisms and comparison to experiment have allowed ""cradle-to-grave"" (reactor parameters to feature shape) predictive capability with the …
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Studies in deep inelastic scattering and vector meson photoproduction
… of the energy, nanentum transfer, and angular dependence of the cross section have been maCle for photon energies between 6~ and 225 GeV.
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Radiation Dose Estimation for Pediatric Patients Undergoing Cardiac Catheterization
… phantoms. </p><p>First, the three-dimensional angular dependence of MOSFET detectors in scatter medium under fluoroscopic irradiation was characterized. A custom-made spherical scatter phantom was used to measure response variations in three-dimensional angular orientations. The results were to …
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Transport-theory-equivalent diffusion coefficients for node-homogenized neutron diffusion problems in CANDU lattices
… using two-energy-group diffusion theory (no angular dependence) for a node-homogenized reactor model. The work presented here is concerned with reducing the loss in accuracy entailed when going from Transport to Diffusion. To this end a new method of calculating the diffusion coefficient was …
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Interference effects due to projective-target nucleus scattering in single ionization of molecular hydrogen by 75 keV proton impact
… are directly observed in the scattering angular dependence of the DDCS. The phase angle appears to be most sensitive to the projectile angle but not as sensitive to the electron energy, suggesting that the projectile - target nucleus interaction plays a central role in the interference. …
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N-Vinylcaprolactam based Bulk and Microgels: Synthesis, Structural Formation and Characterization by Dynamic Light Scattering
… and intraparticle collapse during fast heating. Angular dependence of measured diffusion coefficient on the angle of observation was studied for the microgel in the swollen, shrunken and aggregated states. Thermo-sensitive microgels based on N-vinylcaprolactam and acetoacetoxyethyl methacrylate …
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Molecular order at polymer surfaces via X-ray photoelectron spectroscopy
… X-ray Photoelectron used, particularly with angular dependence, to obtain the compositional gradient information from the top 6 run of the surface. It is found that all materials investigated present some kind of preferential and reproducible ordering effect. The ordering ef feet can be …
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Studies of Interactions Between Rod-like Celulose Nanocrystals and Xylan and Pullulan Derivatives: A Light Scattering Study
… experiments exhibited a significantly smaller angular dependence for both samples. However, DOE-2-12B showed a smaller angular dependence than DOE-2-12A. Lengths and diameters of DOE-2-12A and DOE-2-12B obtained by Broersma's formula were 229 " 19 and 19 " 7 nm and 240 " 18 and 22 " 6 nm, …
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An Implantable Mosfet Dosimeter Modified to Act As A Fiducial Marker
… and transmit dose information, the energy dependence, angular dependence and wireless read range of the modified dosimeter were measured and compared to unmodified dosimeters. It was found that the modified dosimeter performed as well as the unmodified dosimeter while also being suitable …
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A study of the spin dependence of pion electroproduction near the [delta] region
… experiment reports for the first time the full angular dependence of asymmetries, compared with theoretical predictions by several pion production models. In some kinematic bins, signs of preference of data to a specific model have been seen, and hints of systematic deviation of data from models …
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