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 122 for “"Deposition Rate"”.
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Effects of Surface Roughness on the Indoor Particle Deposition Rate Constant
<p>The purpose of this work was to quantify the deposition rate constants of size-classified particles on typical indoor surface materials as affected by the degree of surface roughness. The experiments were conducted in a small-scale acrylic chamber. The particle size range was from 0.723 to 5.048 …
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Linear magnetron high deposition rate magnet pack for high power impulse magnetron sputtering
… proven to be a promising ionized physical vapor deposition (PVD) technique, with industrial implementation hindered by low deposition rates. HiPIMS applies high voltages and high currents at low duty cycles to the sputtering target in order to achieve very high power densities, causing electron …
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An investigation into the effects of complex topography on particle dry deposition
… to predict the spatial variation of particle dry deposition following a nuclear accident. The interaction of landscape features, atmospheric flow and particle dry deposition has been investigated with this in mind. Wind tunnel studies have been used with computational fluid dynamics to predict the …
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Additive-Assisted Nucleation and Growth of Thin Films: Controlled Experiments and Multiscale Simulations
… growth and wild nucleation during copper electrodeposition. Additive compositions that served to suppress the deposition rate (high chloride (10 ppm) and high PEG (3000 ppm)) slowed the deposition rate on the Cu seeds and increased the level of wild nucleation on the Au substrate. Decreased …
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A Simplified Model of Planetary Chemical Vapor Deposition Reactors
A simplified model for planetary chemical vapor deposition reactors is proposed and used to compute deposition species mole fraction and deposition rate in the reactor depletion zone. First, the modeling and optimization work performed in the literature is reviewed and their representative …
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Secondary Plasma Sources for Ionized Physical Vapor Deposition
… are eliminated. Ionization fractions to the substrate of 51 +/- 10% with a deposition rate of 847 +/- 42 A/min. are found. Without the antenna, the ionization fraction is 30 +/- 6% and the deposition rate is 815 +/- 41 A/min. This remote source is envisioned to sit six or more around a sputtering …
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Measurements and modeling of deposition rates from near-supercritical, aqueous, sodium sulfate and potassium sulfate solutions to a heated cylinder
… as solid phases. These salts can form agglomerates and coat internal surfaces, leading to plugging of transport lines and inhibition of heat transfer. The purpose of this dissertation is to develop an understanding of salt deposition kinetics and nucleation phenomena at conditions relevant to …
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Investigation Of Parallel Planar Defects And Texture Transformation In Electron Beam Evaporated Silver Thin Films
… film nanotwin density is affected by changes in deposition parameters is not yet agreed upon. The influence of deposition rate on nanotwin density and texture transformation of silver thin films is investigated in this work. Silver thin films were synthesized at varied deposition rates using …
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Process property relations in reactively sputtered transition metal compounds
… the effect of energetic species, which are generated by backscattering of plasma ions at the target, on the growth and the properties of transition metal nitride films deposition by direct current magnetron sputtering (dcMS) is manifested. Using film and plasma characterization techniques, as …
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Atomistic effects in reactive direct current sputter deposition
… undertaken towards this end: An already existing deposition system was upgraded with new pressure gauges and a quadrupole mass analyzer to meet the new requirements for total and partial pressure determination. In consequence, it was possible to switch from the macroscopic parameter pressure to …
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Comprehensive throughflow method for steam turbine development
… examining the impact of wake chopping on generated droplet size spectra and thermodynamic relaxation losses. A comprehensive sensitivity study of the predicted droplet spectra to modelling parameters and inlet temperatures (changing the nucleation zone location) is performed to discern the …
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Experimental and numerical modeling of submarine channel flow and morphodynamics
… made from the experimental study:</p> <p>(i) the deposition rate was significantly higher inside the channel compared to the over-bank area, especially in the upstream region; (ii) asymmetric channel cross sections developed due to higher deposition rate on the outer bank of the channel bends; …
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Mechanisms and kinetics of silicon atomic-layer epitaxy on silicon(001)2x1 and germanium(001)2x1
… Si films have been grown on Si(001)2x1 substrates by UV-photostimulated atomic-layer epitaxy (ALE) from Si$\sb2$H$\sb6.$ The ALE deposition rate R per growth cycle remains constant at 0.43 monolayers (ML), 1 ML = $6.8\times10\sp{14}$ cm$\sp{-2}$, over a wide range of deposition parameters: …
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Enhancement of fine particle deposition to permeable sediments
Predictions of deposition rate are integral to the transport of many constituents including contaminants, organic matter, and larvae. Review of the literature demonstrates a general appreciation for the potential control of deposition by bed roughness, but no direct tests involving flat sediment …
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Using Digital Pheromone to Improve the Hitting Time Performance of Mobile Agent-Based Systems
… the movement patterns of digital ants and the deposition rate of digital pheromone within this framework have a profound effect on the effectiveness of the system. In this thesis, specific digital ant movement patterns and digital pheromone deposition rates are examined and compared. How …
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An investigation of the temperature distribution induced during laser chemical vapor deposition (LCVD) of titanium nitride on titanium-aluminum-vanadium
To understand how the substrate temperature influences the deposition rate and spatial profile of deposits formed using laser chemical vapor deposition (LCVD), spatially resolved multi-wavelength pyrometry measurements of the substrate temperature have been made during LCVD of titanium nitride …
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Silicon Carbon(001) Gas-Source Molecular Beam Epitaxy From Methyl Silane and Silicon Hydride: The Effects of Carbon Incorporation and Surface Segregation on Growth Kinetics
… sticking probability and, hence, the sublayer deposition rate. This continues until a critical C coverage is reached allowing the nucleation and growth of a C-rich sublayer until the excess C is depleted. At this point, the self-organized bilayer process repeats itself.
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Nanocrystalline copper-tantalum composites
… produced using a plasma assisted physical vapor deposition (PAPVD) process which allowed ion bombardment during alloy deposition. Techniques used for structural and chemical analyses of these alloys include: transmission and scanning electron microscopy, energy dispersive x-ray analysis, x-ray …
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Studies and applications of molecular beam epitaxy
… on the density of surfaces steps as well as the deposition rate. A perturbed step-flow-growth model is formulated and applied to the results to determine a critical cluster size for growth. The analysis reveals that the growth is dominated by mobility changes associated with the formation of …
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Systematic studies on structural and optical properties of organic thin films on inorganic substrates
… layers of organic materials have been demonstrated with active device thicknesses of only a few hundred nanometers or less. For a better understanding and design of such devices, it is necessary to understand the structural and optical properties of the organic thin films employed. Polymers …
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