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 32 for “"faceting"”.
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Structure and faceting of low-symmetry metal surfaces
… observe, in situ, the evolution of the faceting surface. We find that the faceting is driven by the formation of O/Cu(104) facets: 0 exposure induces spinodal decomposition of the (115) surface into (104) and (014) facets, which form spontaneously, and also disordered, stepped facets, …
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Accelerated coplanar facet radio synthesis imaging
… in the computed image. We propose a coplanar faceting algorithm, where the sky is split up into many smaller images. Each of these narrow-field images are further corrected using a phase-correcting tech- nique known as w-projection. This eliminates the projection error along the edges of the …
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Copper metallization with an electron cyclotron resonance
… features by the argon ions (a phenomenon know as faceting). Switching to a copper evaporative system allowed for a pure copper plasma, enabling the use of greater (in magnitude) surface bias, ; I- 200V , before faceting by copper ions was observed. The fill quality of the features degraded with …
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Planar Tunneling and Andreev Bound State Spectroscopy of Yttrium Barium Copper Oxide Thin Films Using Solution-Deposited Zirconia Insulators
… varying the value of the tunneling cone, surface faceting and quasiparticle lifetime, in agreement with the observations, splitting vs. non-splitting of the zero-bias conductance peak can be understood.
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Grain Boundary Structure in Alumina
… ceramics are prone to show glassy phases, faceting, and some fraction of highly coincident twin-related boundaries. These separate phenomena and their inter- actions have been studied in six distinct materials of both commer- cial and experimental origin. Glass containing materials show …
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Embayments in explosive, silicic eruptions : a textural, numerical, and experimental assessment.
… timescales: diffusion speedometry, emptying, and faceting.
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Thermodynamic stability and implications of anisotropic boundary particles
… interfacial free energies do not produce faceting-and maintains a icKy = 0 while the boundary particles maintain a nonzero ,Ky. This is consistent with independent observations of Pb-rich particles at grain boundaries in dilute Pb-AI alloys. Predicted particle/boundary morphologies give a …
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The effect of environment, chemistry, and microstructure on the corrosion fatigue behavior of austenitic stainless steels in high temperature water
… in thickness as the testing progressed, and faceting on the surface was highly crystallographic. Faceting ran both perpendicular and parallel to the crack for the short rise time steps of the test, but fewer perpendicular facets were evident at the longer rise times. The high sulfur material …
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Facette : using facets to improve tag-based bookmarking
… and introduces the concept of collaborative faceting. For ease of implementation, Facette is implemented as an augmentation of Delicious' tagging system. Faceted information is saved to Delicious through use of new tag syntax. Faceted information is retrieved from Delicious through use of …
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Planar Tunneling and Andreev Bound State Spectroscopy of YBa2Cu3O7- d Thin Films Using Solution-Deposited Zirconia Insulators
… varying the value of the tunneling cone, surface faceting and quasiparticle lifetime, in agreement with the observations, splitting vs. non-splitting of the zero-bias conductance peak can be understood.
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The impact of multilayer periodicity on texture, morphology, chemical stability and machining performance of titanium aluminum nitride/chromium nitride thin films
… at lambda = 2 nm and an increase in secondary faceting with increasing periodicity. Nearly rounded column tops result at lambda = 16 nm. Surface roughness measurements showed an increasing roughness with decreasing bilayer period and pole figures revealed a small [111] texture component …
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Directed Synthesis and Doping of Wide Bandgap Semiconducting Oxide Nanocrystals
… crystals indicate that the surface structure and faceting of oxides dramatically influence their catalytic properties. For plasmonics applications, degenerately doped oxide nanocrystals may act as low-loss substitutes for metals, but little is known regarding the influence of particle shape or …
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Single-crystal germanium growth on amorphous silicon
… Ge confined in one dimension. The growths show faceting across large areas, in contrast to as-deposited poly-Ge, corresponding to enhanced grain sizes. Growth confinement is shown to reduce the defect density as the poly-Ge grows. When coalesced into a continuous film, the material grown from 1 …
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Microstructuring and domain-engineering of lithium niobate using combinations of light, etching and poling
… angular deflections, which are increased by faceting of the output face. Deflections of greater than 18o have been demonstrated using this technique. Cascading of devices and possible device implementations are also suggested.
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Morphology, structure and electronic properties of CdTe surfaces studied by scanning tunneling microscopy
… structure. For both faces, a large amount of faceting was observed to occur with the facets formed by {311} planes. Finally, wet chemically treated surfaces, important for the construction of many semiconductor devices, were investigated. Here the change in surface morphology for a variety of …
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Tailored heterogeneous catalysts for biomass conversion
… how controlled synthesis impacts catalyst faceting, morphology and performance. Chapter 3 examines the stability and catalytic behavior of MgO(111) nanocatalysts when coated with carbon. This modification preserves catalyst activity under reaction conditions and enhances the efficiency of …
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Solid-state dewetting of continuous and patterned single crystal Ni thin films
… stages of dewetting. These include inplane faceting of retracting edges, accelerated growth at concave corners, edge drag at convex corners, edge pinch-off, and Rayleigh-like instabilities. Clear identification of these instabilities leads to improved understandings of the kinetic mechanisms …
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Accurate image reconstruction in radio interferometry
… imaging algorithms: improved W-Stacking and N-Faceting. The improved W-Stacking method uses a three-dimensional gridding, rather than two-dimensional gridding as in the original W-Stacking method. This renders possible the calculation and application of the correcting function on the $n$ …
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Feature profile evolution during the high density plasma etching of polysilicon
… sidewalls achieved with HBr, 4) the double faceting of the feature sidewalls under etching conditions accompanied by significant deposition, 5) the delay in the onset of microtrenching at the feature bottom while etching photoresist-masked samples with C12, 6) the greater microtrenching …
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Development of thermal field-flow fractionation for the characterization of hybrid nanoparticles and polymers with complex architecture
… The affinity of the adsorbates for specific faceting on the analyte surface could be further exploited to enhance separations by morphology. Investigation of analyte-solvent interactions and the role of solvated conformations of organic-inorganic hybrids was strongly informed by studies of …
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