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 69 for “"Angle Of Incidence"”.
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Environmental analysis and prediction of transmission loss in the region of the New England Shelfbreak
A confluence of several coastal oceanographic features creates an acoustically interesting region with high variability along the New England Shelfbreak. Determining the effect of the variability on acoustic propagation is critical for sonar systems. In the Nantucket Shoals area of the Middle …
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Excitation of source electromagnetic waves at microwave frequencies using optical techniques
<p>"The coupling efficiencies for the excitation of surface electromagnetic waves (SEW} for both the prism and the grating techniques have been studied experimentally in the microwave frequency range. The grating experiments included studies of the SEW coupling efficiencies as functions of the …
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A theoretical one-dimensional analysis of both the temperature and stress distributions in a flat semitransparent plate subjected to a high intensity radiative source at arbitrary incidence angles
… stress distributions in a semi-transparent solid of flat plate geometry exposed to a collimated radiative source for various angles of incidence is investigated. This plate is convectively insulated on the surface where the radiation is incident while the rear surface is convectively cooled. Tile …
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Study of Ellipsometric Applications and Examination of Optical Anisotropy in Aluminium and Silicon Oxides
… oxidation temperature. A reduction in the range of 83% was obtained in aluminium oxide (as received) after it was annealed for four hours at 500°C. However, a 91% reduction was achieved in silicon oxide when it was annealed for 90 minutes at 950°C. The importance of using the correct refractive …
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Numerical Loss Prediction of high Pressure Steam Turbine airfoils
… therefore, understanding their performance at off design conditions is critical to ensure that the needs of the power demanding systems are met as well as ensuring safe operation of the steam turbines. In this thesis, the aerodynamic performance of three different turbine airfoil sections ( …
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Experimental Investigation of the Active Flow Control on a Two-Dimensional Wind Turbine Airfoil
… unsteady aerodynamic loading under various off-design conditions. The fatigue loading reduces the operational time of the wind turbine hence leads to an increase in the Cost of Energy (CoE) of the wind power. In this study, active flow control with unsteady blowing actuators was applied to a …
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Pattern formation and evolution on Pt(111) by grazing incident ion bombardment
… scanning tunnelling microscopy (STM) the amount of material which is removed during grazing incidence ion bombardment from a Pt(111) sample, it was possible to determine the different sputtering yields of ions impinging either on ascending step edges or hitting onto flat terraces. From the …
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Environmental analysis and prediction of transmission loss in the region of the New England Shelfbreak
A confluence of several coastal oceanographic features creates an acoustically interesting region with high variability along the New England Shelfbreak. Determining the effect of the variability on acoustic propagation is critical for sonar systems. In the Nantucket Shoals area of the Middle …
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The solid particle erosion of WC-Co alloys
An investigation involving the erosion of WC-Co alloys by solid particle impact erosion was undertaken to determine the mechanism by which material is removed. For this purpose a simple particle-gas stream erosion apparatus was employed. The nineteen different WC-Co alloys studied were initially …
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Growth and characterisation of multifunctional nanocomposite coatings
Novel nanocomposite coatings of the type Fe-Ti-N and Fe-Ti-O-N, having in-situ formed periodic multiphase nanocolumnar microstructures, have been developed by a two-target reactive magnetron sputter deposition and nanoparticle-assisted electro-co-deposition processes. Advanced thin-film …
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Fusion-Product Transport in Axisymmetric Tokamaks: Losses and Thermalization
… including the non-separable dependence of flux as a function of poloidal angle and local angle-of-incidence at the first wall. The flux is strongly peaked at near grazing incidence, suggesting that blistering-injected impurities can reduce reactor burn times by 50-70%. Non-prompt losses …
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Polarizing Optical Devices Based on Embedded One-Dimensional Subwavelength-Structured Photonic-Crystal Layers
… total internal reflection (TIR) and interference of light in a transparent thin-film coating at the base of a prism are presented. Explicit equations that guide the optimal design are provided. The optimal refractive index and normalized thickness of QWR coatings on glass and ZnS prisms are …
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Experimental Investigation of Transonic Shock Oscillations on NACA 0018 at Incidence
… Center for Physical Acoustics at the University of Mississippi. Tunnel runs were conducted with the angle of incidence increasing from 0 degrees to 6 degrees at 1 degree increments, while the Mach number was held steady at 0.73. High-speed schlieren images were recorded at a sample rate of 4,000 …
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The colour of AuAgCu alloys
The colorimetric properties of the AuAgCu ternary system have been examined with a nulling spectro-ellipsometer. The use of an ellipsometer to derive the colour co-ordinates of a sample is a novel technique. The ellipsometer has the advantages for use as a physical colorimeter in that its …
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Radiative characteristics of spherical cavities having partially or completely specular walls
… walls is solved and the distribution of the local heat transfer for various opening angles and surface emissivities is obtained. Subsequently, the overall emission from the cavity (i. e., the apparent emissivity of the cavity) is calculated for various opening angles and surface …
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Mechanisms for intrinsic stress evolution during and after polycrystalline film growth
Growth of polycrystalline films involves poorly understood kinetic processes that occur far from equilibrium and lead to complex co-evolution of the surface, microstructure and intrinsic stress of the films. Here we present a comprehensive study consisting of in situ stress measurements, …
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Wave propagation in finite element and mass-spring-dashpot lattice models
Numerical efficiency comparisons of a four-node finite element model (FEM), a mass-spring lattice model (MSLM), and a mass-spring-dashpot lattice model (MSDLM) are investigated. Specifically, the error in the ultrasonic phase speed with variations in Poisson's ratio and angle of incidence is …
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Optimization of a Vortex Generator Configuration for a 1/4-Scale Piper Cherokee Wing
<p>Several sets of wind tunnel tests were performed to determine an optimum vortex generator configuration for a 1/4-scale model of the Piper Cherokee wing. Several variables were incorporated into this experiment in an effort to determine their influence on vortex generator performance enhancement …
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Evaluation of spatial-spectral filtering in non-paraxial volume holographic imaging systems
In this thesis, the properties of transmission-mode volume phase holograms as spatial-spectral filters in optical systems for microscopic medical imaging are evaluated. In experiment, the relationship between the angle of incidence and diffraction efficiency are invesitgated for wavelength-detuned …
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Wave propagation in finite element and mass-spring-dashpot lattice models
Numerical efficiency comparisons of a four-node finite element model (FEM), a mass-spring lattice model (MSLM), and a mass-spring-dashpot lattice model (MSDLM) are investigated. Specifically, the error in the ultrasonic phase speed with variations in Poisson's ratio and angle of incidence is …
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