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 11 of 11 for “"Phase Decomposition"”.
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Reservoir Delineation Using Bandwidth Extension and Phase Decomposition
… impedance relative to the surrounding shales, phase decomposition enhances amplitude anomalies and is found to have improved correlation between seismic amplitude and presence or absence of hydrocarbons. Combining bandwidth extension and phase decomposition improves determination of the …
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Nonlinear Dynamic Combustion of Energetic Solids
… agreement. Results indicate that HNF condensed-phase decomposition is overall slightly exothermic (increasing with pressure) with activation energy similar to that for proton transfer between hydrazinium and nitroformate ions. The gas-phase flame is highly exothermic with low activation energy, …
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Modeling and analysis of the forced-flow thermal gradient chemical vapor infiltration process for fabrication of the ceramic matrix composites
… which use lumped reaction schemes, both gas phase and surface reactions of the FCVI process were explicitly considered for the present FEM FCVI model. The kinetics of SiC deposition from MTS precursor were derived by analyzing our own deposition rate data as well as reported results. The SiC …
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An investigation of the gas phase thermolysis of hexaborane (10) by quantitative mass spectrometry
… gives the composition of the mixture. The gas phase thermolysis of hexaborane(10) has been studied by this method for pressures in the range 1-10 mmHg, and at temperatures between 75 and 153°C. Hexaborane(10) is found to decompose by a second order process having an activation energy of 79 ± 5 …
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Design of novel lithium storage materials with a polyanionic framework
… the other, theoretically. However, the hexagonal phase was nothing but a disregarded composition due to its negligible Li intercalation capacity. In contrast, the monoclinic LiMnBO₃ compound exhibited much more electrochemical activity than the hexagonal polymorph. In this thesis work, the …
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Computer Modeling and Simulation of Morphotropic Phase Boundary Ferroelectrics
Phase field modeling and simulation is employed to study the underlying mechanism of enhancing electromechanical properties in single crystals and polycrystals of perovskite-type ferroelectrics around the morphotropic phase boundary (MPB). The findings include: (I) Coherent phase decomposition near …
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Phase formation sequence at metal-germanium interfaces in thin film systems.
… This thesis concerns itself mainly with phase formation in metal-germanium systems. Characterisation of samples after heating in a vacuum furnace was done by Rutherford Backscattering Spectrometry (RBS) and X-Ray Diffraction (XRD). Ti-Ge, Pd-Ge, Zr-Ge, Fe-Ge and Cr-Ge thin film systems …
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Understanding the formation and influence of the omega phase in metastable beta Ti-Nb based alloys
… induced transformation to the martensitic α″ phase, enabling superelasticity. However, the inability to control key properties of the transformation prevents industrial uptake, with the presence of the hexagonal ω phase often reported as a primary cause for such challenges. Despite over 70 …
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Phase Relations in the YBa2Cu3O7-x - SiO2 System and the Impact on Superconducting Fibers
… reported identification and analyses of the phase relations in the YBa2Cu3O7-x (YBCO)-SiO2 system at elevated temperatures. In this regard, a rigorous characterization study of the reaction phases within YBCO glass fibers, heat-treated YBCO+SiO2 pellets, rapid thermally annealed YBCO+SiO2 …
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Engineering Functional Defects in Oxides Using External Stimuli
… during catalytic reactions and solid-state phase transformations in functional oxides. Second, I have utilized and explained the effects of external stimuli, specifically with lattice strain, oxygen chemical potential, chemical doping, and ion irradiation, in tailoring the concentration and …