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 88 for “"DEPOSITION RATES"”.
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Comparison of carcass composition, performance, and tissue deposition rates among breeds of swine
… in performance, carcass traits, and tissue deposition rates among breeds of swine entered in the 2003 National Barrow Show Progeny Test. The test consisted of 362 barrow and gilt progeny from sires within each of the 8 breeds evaluated. Breeds tested were Berkshire (n = 158), Duroc (n = 76), …
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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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Magnetic field optimization for high power impulse magnetron sputtering
… (HiPIMS) is a promising Physical Vapor Deposition technique with several advantages over DC Magnetron Sputtering (dcMS). HiPIMS has gained a lot of interest in the recent years from the coating industries. The films that are deposited by HiPIMS technique are of superior quality and their …
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Corais e comunidades recifais e sua relação com a sedimentação no Banco dos Abrolhos, Brasil
… reefs closer to shore presented higher sediment deposition rates than reefs farther from mainland. Deposition rates were, in most cases, higher at winter-spring and, usually, associated with the frequency of NE-E or S winds with speeds higher than 15 knots. This and the absence of differences in …
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Use of Lagrangian methods to describe particle deposition and distribution in dispersed flows
… the effect of pipe diameter, gas and liquid flow rates on deposition rates in air-water annular flow. An estimate of the droplet slip ratios has been obtained. This provides an improved correlation of measured deposition rates with droplet concentration. In addition droplet slip ratios are useful …
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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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Case study to document the condition of McConnell creek and the effect of redcedar revetments
… of a site, accelerating the natural erosion rates of the stream banks and decreasing water quality. This case study was conducted to document overall creek condition at McConnell Creek in Wichita, Kansas and estimate the effect of streambank stabilization installations. The effects of the …
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Metalorganic chemical vapor deposition of metal oxides
… on Si, sapphire disks, and Pt/Ti/SiO₂/Si substrates by hot wall metalorganic chemical vapor deposition (MOCVD). Bis(cyclopentadienyl)ruthenium [Ru(C₅H₅)₂], zirconium tetramethylheptanedione [Zr(thd)₄], triphenylbismuth [Bi(C₆H₅)₃], and titanium ethoxide [Ti(C₂H₅O)₄] were used as precursors. …
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Examining Coastal Marsh Sedimentation In Northeastern North Carolina
… analysis were used to evaluate short-term deposition relative to decadal-scale accumulation and assess whether two marshes in northeastern North Carolina were maintaining their systems relative to sea-level rise. It was determined that deposition is highly influenced by marsh geomorphology, …
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Predicting hydrates plugging risk in subsea gas pipeline: CFD, analytical and linear regression modelling.
… challenges lie in accurately predicting hydrate deposition rates and associated pressure drops. To overcome these limitations, the study developed and validated a 3D computational model using computational fluid dynamics (CFD) and mathematical models. The model simulates a 10-meter long, …
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Numerical Simulation and Experimental Validation of Fluid Flow and Mass Transfer in an Ammonothermal Crystal Growth Reactor
… onto the seeds. Because the etching and deposition reactions require temperatures in the range of 600 to 1,000 K (620 to 1,340 °F) and pressures in the range of 1,000 to 6,000 bar (14,504 to 87,022 psi), it is impossible to visualize the flow or measure its parameters.This dissertation …
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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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Novel Low Dielectric Constant Thin Film Materials by Chemical Vapor Deposition
A modified CVD reactor was designed with a deposition chamber capable of accommodating 8" wafers, with the capacity to remotely pyrolyze two different precursors. The design was based on a previous working reactor, with the most notable improvements being a showerhead design for more even delivery …
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Large Eddy Simulations of Particle Dispersion and Deposition in a Turbulent Square Duct Flow
Deposition of particles in a square duct is the focus of the second set of simulations. Ten particle response times are studied. Simulations are carried out using one-way coupling as well as select cases using two- and four-way coupling. A particle-particle collision algorithm has been developed. …
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H-Mediated Film Growth and Dopant Incorporation Kinetics During Silicon Germanium(001):boron Gas-Source Molecular Beam Epitaxy
… B doped Si 1-xGex(001) GS-MBE were modeled. Film deposition rates RSiGe decrease by ≈50% with increasing CB ≥ 5 x 1019 cm-3 at Ts = 500°C. The TPD results were used to determine the B segregation enthalpy, -0.4 eV, significantly lower than the value for Si(001):B, -0.53 eV.
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An Investigation of Flow-Limited Field-Injection Electrostatic Spraying (Ffess) and Its Applications to Thin Film Deposition
Deposition of TiO2 and silver thin films using multi jet FFESS is studied, demonstrating great control on film morphology and properties. TiO2 thin films deposited on high-intensity discharge arc lamps are found to improve the quality of its light output. Silver thin films of high purity and …
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Measurements and Modeling of Coal Ash Deposition in an Entrained-Flow Reactor
… fuels and operating conditions. The work incorporates existing information in the literature on ash deposition into a User-Defined Function (UDF) for a commercial comprehensive combustion and CFD code. Results from the new submodel and CFD code is are then compared to deposition measurements in …
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Ozone chemistry during global glaciations : a possible climate feedback
… reactive chlorine, lightning frequency, surface deposition and albedo as altered constraints on ozone processes is discussed. An elementary box model is developed by the author to make first order judgments regarding the significance of chemistry changes on ozone concentrations and its climactic …
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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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