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 17 of 17 for “"Poly-crystalline"”.
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Investigation of defect formation and control in poly-crystalline anatase titanium dioxide
Titanium dioxide (TiO2) has become one of the most prominent materials in the research efforts related to the clean production of energy and value added chemicals. TiO2 has been praised for the catalytic activity of its anatase phase, its abundance in nature, low toxicity, stability in aqueous …
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Development of Next Generation of High Voltage Poly Crystalline Silicon Thin Film Transistors
… mainly focuses on development of next generation polysilicon high voltage TFTs for their potential use in display applications and in PICs where high voltage and low current arc a requirement. A study on high voltage SOI and SOS devices is also carried out to transfer the knowledge acquired from …
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Synthesis of 1T-Tantalum (IV) Sulfide and observation of charge density wave using scanning tunneling microscopy
… synthesis of 1T-TaS2. We have successfully grown poly-crystalline 1T-TaS2 powder through a direct solid-solid reaction and single-crystals of 1T-TaS2 through Iodine-assisted chemical vapor transport (CVT). After a few growth setup revisions, the growth processes have given consistently high …
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Optical reflectance spectra of chromium (III) in MgO-ss
… host lattice. The chromium ion incorporated into poly-crystalline MgO by quenching from elevated temperatures allowed investigation of a single crystalline phase, MgO-solid solution (ss). The chromium ion was confirmed to occur in the trivalent state and to occupy octahedral cation sites in the …
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Heat Transport across Dissimilar Materials
… first study examines k and G for amorphous and crystalline Zr47Cu31Al13Ni9 metallic alloys that are in contact with poly-crystalline Y2O3. The motivation behind this study is to determine the relative importance of energy coupling mechanisms such as electron-phonon or phonon-phonon coupling …
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Atomistic simulation of deformation induced rotation in Cu-Nb composites
… a rotation algorithm. A Cu-Nb bicrystal and poly-crystalline model with a {111}<110> Cu// {110}<111> Nb interface character were found to rotate significantly from their initial crystallographic orientation under compression. A Cu-Nb bi-crystal model with a {112}<111>Cu // {112}<110>Nb …
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In vitro investigation into bond strength of metal and ceramic orthodontic brackets
… metal reinforced ceramic (3M Unitek Clarity) and poly-crystalline ceramic (3M Unitek Transcend). Samples were stored at 37 degrees C for 24 hours. Each bracket was debonded using shear force applied by the Instron Universal testing machine. Samples were examined under x10 light microscopy and …
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Development of Microcombustors and Characterization of Confined Sub-Millimeter Laminar Diffusion Flames
… was developed to mitigate radical quenching on poly-crystalline alpha-alumina surfaces. A laminar diffusion flame structure consisting of a column of cellular edge flames aligned in the direction of flow was discovered and is believed to be novel to the microscale. Characterization of the …
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Phenomenological study of Au and Pt nanowires grown in porous alumina scaffolds
… was found that the overgrown Au caps were single crystalline with (111) facets and textured along the [100] direction, while the Au nanowires in the pores were poly-crystalline with a [11 11] texture. Pt nanowires grown in pores were also polycrystalline and had a [111] texture, but the grain size …
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Fracture Resistance of Coated Polycrystalline Silicon Wafers
… devices are silicon wafers in both single- and poly-crystalline forms. Their inherent defects and brittleness, however, impair their performance and reliability and can lead to premature fracture. This becomes important in applications in which silicon-based devices are subject to cyclic …
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A practical high temperature photonic crystal for high performance thermophotovoltaics
… optical performance; by adopting commercial poly-crystalline tantalum to fabricate large-area samples; by developing a HfO₂ passivation coating for improved thermo-chemical stability; and by developing a HfO₂ cavity filing process for improved omnidirectional performance. More specically, we …
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Analysis of single-diode and improvement of double-diode photovoltaic source modelling methods and techniques
… modules made from different technologies: mono-crystalline, poly-crystalline and thin-film technology. This method is an improvement on an existing method and is more accurate. A comparison is made with the characteristics extracted from the datasheet to verify that it produces accurate results. …
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Impact of cellular dislocation structures produced by additive manufacturing on neutron irradiation damage evolution in stainless steel 316L
… to traditional strengthening approaches in poly-crystalline materials. It is hypothesized that Lomer-Cotrell (L-C) locks observed in high resolution imaging of the cellular walls contribute significantly to the preservation of the strength-providing dislocation cell network and promote …
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Aspects of serrated flow in aluminium alloys
… during in-situ dynamic HVEM experiments on poly crystalline material correlated with the extent of serrated flow manifest in bulk specimens. All materials deformed in the HVEM displayed inhomogeneous dislocation motion consistent with the macroscopically observable discontinuities. The …
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Swift heavy-ion irradiation of amorphous silicon dioxide, silicon nitride and silicon oxynitrides composite systems: from ion tracks to nanoparticle shaping
… CVD (LPCVD), the layer undergoes an amorphous-to-poly-crystalline phase transformation. For the study of the ion shaping process of Au NPs embedded in a-SiO2, a-Si3N4 and at the interface of a-SiO2 and a-Si3N4 a good control of the initial NPs size is required. To achieve that, Au NPs were …
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Swift heavy-ion irradiation of amorphous silicon dioxide, silicon nitride and silicon oxynitrides composite systems: from ion tracks to nanoparticle shaping
… CVD (LPCVD), the layer undergoes an amorphous-to-poly-crystalline phase transformation. For the study of the ion shaping process of Au NPs embedded in a-SiO2, a-Si3N4 and at the interface of a-SiO2 and a-Si3N4 a good control of the initial NPs size is required. To achieve that, Au NPs were …
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Design and Mechanism Study of Electrocatalysts for Alkaline Hydrogen Evolution
… HER mechanism are carried out using single/poly crystalline Pt as a model catalyst. However, it has been found that some of the mechanistic understandings drawn from the bulk model catalysts are inapplicable to highly active nanostructured catalysts in practice. Therefore, an alternative …