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 12 of 12 for “"Surface Charging"”.
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INVESTIGATION OF CRYOGENIC SURFACE CHARGING DURING OFF-AXIS ELECTRON HOLOGRAPHY
… a model system is proposed to address interface charging effects that are typically ignored when analyzing cryo-EM data. Cryogenic specimen fabrication rapidly solidifies the solution through cooling the native fluidic state, preventing short- and long-range ordering from occurring, compared to …
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Immersed Finite Element Particle-In-Cell Modeling of Surface Charging in Rarefied Plasmas
Surface charging is a fundamental interaction process in space plasma engineering. A three-dimensional Immersed Finite Element Particle-In-Cell (IFE-PIC) method is developed to model surface charging involving complex boundary conditions. This method extends the previous IFE-PIC algorithm to …
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Investigation of Surface States and Device Surface Charging in Nitride Materials Using Scanning Kelvin Probe Microscopy
… Probe Microscopy (SKPM) was used to characterize surface states and device surface charging in nitride materials. Samples grown by Molecular Beam Epitaxy (MBE), Metal Organic Chemical Vapor Deposition (MOCVD) and Hydride Vapor Phase Epitaxy (HVPE) typically show a high surface band bending of …
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Nanoporous Gold: Mechanics of Fabrication and Actuation
… thin films during their fabrication and during surface charging. Fabrication of microstructures comprised of NPG requires a precise control over selective corrosion of the precursor alloy. In many designs, the precursor alloy is constrained to a substrate, and complex surface reconstruction …
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A study of dusty plasma environment
… used to study plasma behaviour and spacecraft charging in the vicinity of dust particles. Results presented shows the capability of the software to model the dust charging process and offers new observation on plasma properties in the vicinity of dust particles. The second contribution of this …
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Cubesat Wakes in the Earth’s Ionosphere
… length. Although spacecraft-plasma interactions- surface charging, plasma sheaths and wakes- have been well-studied for larger satellites, they are less understood for CubeSats.</p> <p>The Dynamic Ionosphere CubeSat Experiment (DICE) is a 1.5U CubeSat which recently ended its mission. DICE carried …
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Application of scanning micro-tip and UHV Kelvin probes in surface and material characterisation.
… utilising the scanning Kelvin probe (SKP) for surface potential mapping and monitoring changes in work function due to environmental influences in ambient and UHV conditions. The SKP is a truly non-contact technique which determines local work function changes and surface states on conductors, …
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Local Charging Behavior on GaN Surfaces
… high-frequency devices. The nature of the GaN surface and its electrical characteristics can impact the performance of such devices. In this study, several GaN surfaces are locally charged using an atomic force microscope, and then subsequently studied by measuring the surface potential with …
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Fully kinetic particle-in-cell simulations of plasma-surface-dust interactions for lunar exploration
<p>"The studies involving lunar surface explorations have drawn attentions in recent years. A better understanding of possible potential hazards to astronauts and electronic equipment has become a necessity for future lunar explorations. The lunar surface, lacking an atmosphere and global magnetic …
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Nearly Monoenergetic Positive Ion Beam with Self-Neutralized Space Charge Extracted from a Pulsed Plasma and Its Application
… sidewall profiles and smooth flat bottom surfaces were achieved. Specifically, the sample was placed 2 cm downstream of the ion extraction grid and electrons effusing from the pulsed plasma (mainly during the early afterglow) neutralized not only the positive ion space charge, but also the …
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Surface discharge dynamics: theory, experiment and simulation
… the accumulation of charge on the insulator surface has proved to be one of the major factors contributing to system failures. This research work is aimed at studying the dynamics of surface discharge in theory, by simulation and experiment. <br/><br/>Different surface charging theories have …
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How visual representations affect undergraduate students’ use and understanding of engineering concepts during problem solving
In this two-part thesis, I address gaps in the surface science of semiconductor materials for photovoltaics and discipline-based education research literature. Surface Science of Semiconductor Materials for Photovoltaics With the rise of global energy consumption, it is important to find low-cost, …