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 26 for “"Getter"”.
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Zirconium alloy getter bed air-ingress thermal failure analysis
… an unexpected inrush of air into a packed St-909 getter bed, the exothermic reaction of oxygen and pellet material pushes temperatures within the bed to extremely high levels. This failure mode, which could be caused by a line rupture, was modeled, analyzed, and a full-scale experiment was …
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Investigating carbon-capturing getter anode design using a fast computational tool
… failure due to carbon deposition is the use of a getter anode. A getter anode intercepts the carbon prior to deposition on the functional anode. In this work, A CFD model was modified to incorporate a getter anode, and the functional anode in the study saw a roughly 60% drop in carbon deposition …
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Carbon nanotube-based field ionization vacuum
… to and implanted into a negatively biased getter removing the gas molecules from the volume being pumped. CNTs are ideal for field ionization because of their nano-sized diameter, high aspect ratio and of their robust chemical and mechanical structure. The ionizing CNTs are biased at a much …
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Analysis of U-Zr-C-O Quaternary System for Applications in Advanced ZRC Coated Triso Particles
… the efficiency of ZrC for usage as an oxygen getter in oxide TRISO fuels.</p>
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Oxygen precipitate studies in silicon for gettering in solar cell applications
… can be used (in a process called internal gettering) as sites of heterogeneous nucleation of precipitates of iron and other transition metal that are harmful to solar cell device operation. Oxygen precipitate densities in p- (10¹⁴ boron atoms/cm³) wafers were quantified using chemical etch …
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The phylogenesis of palaeoarts, and their coevolution in relation to artification
… toolkit that first evolved as an attention-getter mechanism, and art-making as a set of culturally accumulated practices exploiting this toolkit that evolved following coevolutionary trajectories with socio-cognitive niches in later hominins. I conclude that artification has a mosaic …
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The Effect of Coating Parameters On Advanced TRISO Fuels With Zirconium Carbide
… negate these problems a solution of adding a ZrC gettering layer between the kernel and PyC buffer layer has been proposed. The purpose of this study is to provide insight into the coating parameters and how they affect the coating properties. Advanced TRISO coatings consisting of a ZrC getter are …
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A study of plasma etching for use on active metals
Active metals can be used as a getter pump, removing impurities in ultra-pure high vacuum environments. To relieve the difficulties involved with the transportation, storage and handling of these metals, a process is being developed to create a protective coating by removing the active metal …
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The relationship between background variables and the academic performance of college frehmen
… Assessment Technique (IPSAT) by Nowinski and Getter (1977) and surveyed to determine their birth order positions. High school grade point average (HSGPA), collegiate entrance examination scores on either the SAT or ACT, and college grade point average (CGPA) were gathered from students' …
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Coating Parameters of Zirconium Carbide On Advanced Triso Fuels
… The additional ZrC layer will act as an oxygen getter to prevent failure mechanisms experienced in TRISO particles. Two failure mechanisms that are of the most concern are the over pressurization of the particles and kernel migration within the TRISO particles. In this study successful ZrC …
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The Deposition Characteristics of Zrc On Uo2 Kernels Produced For Advanced Triso Fuels In Gen-Iv Reactors
… of adding ZrC is that it is a good oxygen getter due to a low Gibb's free energy, forming a stable zirconium oxide and free carbon. This will help minimize typical TRISO fuel failures of the amoeba effect, cracking and over pressurization. The ZrC layer was initially deposited on surrogate …
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Miniaturized electron-impact-ionization pumps using double-gated isolated vertically aligned carbon nanotube arrays
… region, and a non-evaporative ion-implantation getter. Single-gated VA-CNT FEAs were tested as field emitters in high vacuum (10-9 Torr). The current density of the tested device is ~0.5A/cm2 (total current of 0.4mA) and a field enhancement factor of 1.41 x106 V/cm was measured, which is …
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The impact toughness of iron manganese alloys.
… 0.1%Ti and 0.1%Al to 'pure' alloys, in order to getter nitrogen, have been found to improve impact properties by reducing intergranular embrittlement. These additions also lead to a 'massive ferrite' structure not previously found in alloys of this manganese level. This is thought to be due to …
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In situ and post mortem surface chemistry measurements of boronization in the national spherical torus experiment upgrade
… the PFCs. The boron layer then acts as an oxygen getter, binding oxygen to the surface and preventing it from contaminating the plasma. The Materials Analysis and Particle Probe (MAPP) is an in situ materials characterization facility installed on NSTX-U and used during the 2015-2016 experimental …
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A Collaborative e-Science Architecture for Distributed Scientific Communities
… generated by experiments on these problems is getter bigger to an extent that might not be manageable by any individual organisations. All of these factors have made global distributed collaborations become increasingly important in modern scientific research. Dealing with distributed …
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Thermodynamic and Thermochemical Investigation of Advanced Triso Coated Particle Fuels
… diagram to evaluate the oxygen gettering ability of ZrC and SiC. It was further used to evaluate methods to control the oxygen partial pressure in experiments over a range of values representative of the TRISO fuel (10-8~10-6atm). This work was done in support of developing …
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Electron beam sizes and lifetimes at MAX II and MAX III
… light source to install nonevaporable getter (NEG)-coated dipole vacuum chambers. They were installed in order to test the feasibility of the MAX IV 3 GeV storage ring vacuum design, where NEG-coated dipole chambers are an integral part of the design. From measurements of the lifetime …
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Droplet growth kinetics on superhydrophobic surfaces and future work on combating cryogenic surface contamination
… to use a functionalized (biphilic) surface to getter water onto a small percentage (< 5 %) of the cryogenic surface, thus maintaining an overall low-emissivity. I aim to determine whether (1) the spatial control of water nucleation that the biphilic surface exhibits in non-cryogenic conditions …
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Interaction of plasmas with lithium and tungsten fusion plasma facing components
… for refractory metals due to its ability to getter impurities, while also being self-healing in nature. However, concerns exist about the stability of a liquid metal surface at the edge of a fusion device. Liquid metal pools, such as the Li-DiMes probe, have shown evidence of macroscopic …
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Internal-External Control of Reinforcement Versus Field Dependence-Field Independence
… 1963; Crowne & Liverant, 1963; Strickland, 1962; Getter, 1962; Gore, 1962; Elliot, 1961; Witkin, Lewis, Hertzman, Machover, Meissner, & Wapner, 1952*). The initial research concerning locus of control as conceptualized by social learning theory (Rotter; 195^ f I960) explains the perception of …
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