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 10 of 10 for “"Ray method"”.
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Asymptotic Wave Solutions for Euler-Bernoulli and Timoshenko Beam by Ray Method and Stationary Phase Method
… theory and has been studied for many years. Many methods have been attempted to understand the flexural waves in beams based on Euler-Bernoulli and Timoshenko beam theories. Accurate numerical evaluations for transient waves in structures are usually difficult due to the complexity of the …
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Development of the random ray method of neutral particle transport for high-fidelity nuclear reactor simulation
… reactor core by way of a general simulation method. General full core simulations can potentially reduce design and construction costs, increase reactor performance and safety, reduce the amount of nuclear waste generated, and allow for much more complex and novel designs. To date, however, …
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Hybridization of the finite element method and the shooting-and-bouncing ray method for scattering and radiation from large and complex targets
… and radiation problems. In this thesis, a hybrid method combining the finite-element method (FEM) and the shooting-and-bouncing-ray (SBR) method is introduced for scattering and radiation problems from large and complex targets with small cavities or microstrip patch antennas. By combining the two …
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High resolution in-vivo electrode localization using microfocal X-rays.
… implementation and testing of a microfocal x-ray stereo system that offers an efficient, accurate, and relatively low-cost solution this localization problem is presented. The results indicate the ability to localize a targets to within -50 microns, in a brain-tissue-based frame. This accuracy …
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Ground state determination, ground state preserving fit for cluster expansion and their integration for robust CE construction
… and clarify our discussion. We review previous methods in material science community: Monte Carlo based method, configurational polytope method, and basic ray method. Further, we investigate the connection of the ground state problem with deeper mathematical results about computational …
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Combined x-ray and thermal conductivity study of hexagonal-close packed helium-4
… and orientation were determined directly by an x-ray method. The specimens, 2.2mmin diameter by 23 mm long, were held in a nylon container. They were obtained by unidirectional growth from the fluid at a constant pressure of 290 atmospheres and by recrystallization. Laue x-ray photographs taken …
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Study of diffusion damage in the copper-nickel system
… data were obtained by the nondestructive X-ray method with supporting measurements using a Scanning Electron Microscope and computer simulations. It has been found that the diffusion behavior is dynamic and is influenced by structure. At lower times a unified grain boundary-volume diffusion …
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Development of appropriate steam turbine models in Flownex
… data. Various pressure drop correlations and methods to predict off-design efficiency were investigated. These correlations and methods were solved analytically and implemented in Flownex. Interpretation of the error analysis for the pressure drop correlations established that the general …
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Study of the organic content and mineralogy effects on the acoustic properties of the Niobrara Formation, Denver Basin
… The previously introduced uranium spectral gamma ray method for TOC prediction by (ElGhonimy, 2015) show closer pattern to the core measured TOC. In contrast, the method presented in this study is a function of shear and compressional wireline acoustic log responses. TOC prediction from C12 …