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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 41 for “"Mixed oxide"”.
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Fuel performance modeling of high burnup mixed oxide fuel for hard spectrum LWRs
According to the future of the nuclear fuel cycle study at MIT, a reactor with a conversion ratio around one can achieve desired objectives in the long-term sustainability of uranium and reduction of transuranic wastes. This finding relaxes the need for sodium fast reactors (SFR) in a closed-loop …
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Economics of nuclear fuel cycles : option valuation and neutronics simulation of mixed oxide fuels
… scenarios economically comparable. For Uranium Oxide (UOX) and Mixed Oxide (MOX) fuels, a traditional way to achieve this is to evaluate both fuels on the deterministic premise that the fuel will be sent to geologic disposal once spent. This methodology often leads to higher costs for cycles …
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Consumption minimization of the uranium resources by the use of mixed-oxide fueled reactors
The need to conserve the limited natural uranium resources necessitates the determination of the optimal use of M0X fueled reactors under various reactor growth scenarios. The reactor growth scenarios include an industry that attains 400, 507, and 600 operating reactors by the year 2000. The …
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Thorium-based mixed oxide fuel in a pressurized water reactor: A feasibility analysis with MCNP
… the feasibility of using a thorium-based mixed oxide fuel in a conventional pressurized water reactor for plutonium disposition. Both non-paralyzing and paralyzing dead-time calculations were performed for the Portable Spectroscopic Fast Neutron Probe (N-Probe), which can be used for spent …
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Kinetic studies of ethane dehydrogenation using carbon dioxide as mild oxidant over gallium aluminum mixed oxide
… of energy research. The synergetic effect of the mixed gallium and aluminum oxide had been studied in this work. We identified an optimized composition of the mixed oxide prepared via the co- precipitation method at a surface Ga/Al ratio of 0.1 and conducted a series of kinetic measurements on …
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Neutronic feasibility assessment of full-core applications of evolutionary mixed-oxide fuels in pressurized water reactors
Thesis (S.M.)--Massachusetts Institute of Technology, Dept. of Nuclear Engineering, 1998.
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Interaction of Na, O₂, CO₂ and water on MnO(100): Modeling a complex mixed oxide system for thermochemical water splitting
… water splitting based on sodium and manganese oxides (Xu, Bhawe and Davis, PNAS, 2012). The key steps are thought to be hydrogen evolution from a Na₂CO₃/MnO mixture, and oxygen evolution by thermal reduction of solids formed by Na⁺ extraction from NaMnO₂. Our work is aimed at understanding the …
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PECVD of silicon and titanium based coatings to enhance the biocompatibility of blood contacting biomedical devices
… SiOxCyHz, silica-like SiOx, titanium oxide TiO, and silicon-titanium mixed oxide coatings were deposited by plasma decomposition of organic molecules. An extensive study was done on silicon based coatings deposited from hexamethyl disiloxane (HMDSO) to analyze the influence of plasma …
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Modeling of Electronic and Ionic Transport Resistances Within Lithium-Ion Battery Cathodes
… discharge rates. Lithium cobalt and ruthenium oxides were tested and modeled individually and together in mixed-oxide cathodes to understand how the superior material properties relative to each other can work together to reduce cell resistances while maximizing energy storage. It was found for …
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Dissolution of mixed uranium thorium oxides under geological disposal conditions
Uranium dioxide alone offers enough complexity to provide the subject matter for 50 years of dissolution studies, not least due to uranium’s redox sensitivity and the orders of magnitudes between the solubility of U(IV) and U(VI). The addition of plutonium dioxide as a solid solution opens up a …
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Effect of deposition conditions and doping on the structure, optical properties and photocatalytic activity of d.c. magnetron sputtered TiO2 thin films
… from sub-stoichiometric, ceramic M2O3/ TiO2 mixed oxide targets (M = Fe, Nd, V) and by ion implantation of TiO2 thin films with Fe and Nd. The deposition conditions of the thin films were fixed and the effect of the additive concentration in the target as well as the ion dose during …
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Heat treatment and additive effects on microstructure and properties of tetragonal-(2-3 mol%) yttria-stabilized-zirconia
… were studied in 2-3 mol% YSZ prepared from a mixed oxide powder. Microstructure-property relationships were then investigated as a function of heat treatment conditions in 3 mol% YSZ prepared from a commercially available co-precipitated powder. Additive effects on microstructure and …
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An investigation into the feasibility of bioleaching copper sulphide ore of Nchanga mine, Chingola, Zambia
… for extraction of copper from its low-grade, mixed oxide/sulphide ores in bioheap operations (Watling, 2006). It is claimed bioleaching may be a cheaper alternative to other traditional metal extraction techniques such as smelting and therefore more suitable to treat marginal or low-grade ores …
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The development of ceria-based catalysts for automotive after-treatment applications
Ceria (cerium oxide) based materials have been widely used for catalytic applications including; fluid catalytic cracking, water gas shift reactions, solid oxide fuel cells and automotive catalytic after-treatment. It has often been the material of choice for supporting precious metals in many of …
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Síntese e caracterização de nanoestruturas de óxido de zinco por via úmida
… the pure wurtzite structure (zincite) and the mixed oxide sample has two phases, zincite and tenorite. All the materials are mesoporous and the specific surfaces obtained vary from 2 to 86m 2 /g. The crystallite size of the samples are range of 6 to 57nm calculated using JADE 5.0 software. The …
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Modelling of thermo-mechanical and irradiation behavior of metallic and oxide fuels for sodium fast reactors
… to model the irradiation behavior of metal and oxide fuels in sodium cooled fast reactors is developed. Modeling capability was enhanced by adopting a non-empirical mechanistic approach to the extent possible, so that to increase the ability to extrapolate the existing database with a reasonable …
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Sensitivity analysis of nuclear fuel cycle transitions
… cycle in which transuranics are recycled to fuel mixed oxide fuel thermal reactors and sodium fast-cooled reactors. The global sensitivity analysis concluded that the transition year input parameter was the most influential to the final depleted uranium and total idle reactor capacity performance …
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Computer simulation of defect evolution in lanthanum doped cerium dioxide under irradiation
Uranium dioxide is the most common choice for fuel material in fission reactors. However, the radioactivity of uranium limits the experimental approaches on the oxide fuel material. Fortunately, cerium dioxide has been shown to be a good surrogate of uranium dioxide in many aspects. To better …
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Impact of alternative nuclear fuel cycle options on infrastructure and fuel requirements, actinide and waste inventories, and economics
… recycling in thermal spectrum LWRs using Mixed OXide (MOX) fuel; 2) Multi-recycling of TRU in sodium-cooled fast spectrum burner cores, characterized by a fissile conversion ratio lower than 1 (FBu); 3) Multi-recycling of TRU in sodium-cooled fast breeders with a conversion ratio of 1.23 …
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