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 28 for “"nuclear fission"”.
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Machine learning for nuclear fission systems : preliminary investigation of an autonomous control system for the MGEP
Commercial nuclear technology today is facing challenges due to both economic viability and concerns over safety. Next-generation reactors could potentially improve with respect to both concerns through recent advancements in computation and machine learning, through autonomous control systems …
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Nuclear fission and social fusion: the impact of the Dounreay Experimental Research Establishment on Caithness, 1953-1966
… local impacts are as much a part of Britain’s nuclear history as national policy and practice: in foregrounding these, this thesis positions the ‘nuclear fission and social fusion’ of Dounreay at the heart of the United Kingdom’s atomic energy programme.
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Comparative analysis of surface power system architectures for human Mars exploration
… and non-tracking photovoltaic power generation, nuclear fission power, dynamic radioisotope power generation, and battery and regenerative fuel cell energy storage. The quantitative analysis is carried out on the basis of equal energy provision to the power system user over one Martian day …
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An ionization chamber for fission fragment analysis
Fission fragments play a pivotal role in understanding the entire nuclear fission process, and their effects are widespread to all applications involving nuclear fission: reactor design and maintenance, waste removal, active and passive integration of nuclear materials, simulations, and the …
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Advances in the Theory of Persistent Neutron Chains
… problem associated with the Markov process of nuclear fission. For half a century, this problem has been solved by truncating fission multiplicities at two, an action known to reduce accuracy for both uranium and plutonium, which typically release between two and three neutrons per fission on …
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Criticality and thermal analyses of separated actinides in transmutation
… problems in the chemical preparation of spent nuclear fuel for transmutation. Once separated from the other minor actinides, the isotopes can lead to nuclear fission with the subsequent release of a large amount of radiation. A neutron criticality code was used to determine the effective …
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Electromagnetic extraction and annihilation of antiprotons for spacecraft propulsion
… engines operating via the catalysis of nuclear fission in a fissile material by antiprotons are found to be three to four (3 - 4) times more efficient than traditional proton-antiproton annihilation or "beam-core" engines, and vastly more efficient than conventional chemical and electric …
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The Experiential Bridge: remedial landscape for Hanford's nuclear future
The groundbreaking discovery of nuclear fission opened up new possibilities for generating power and resources for people. Nuclear energy was much preferred over fossil fuel because of its efficiency in production, availability of resources, and cost. However, the reoccurring nuclear disasters …
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Extra-terrestrial nuclear power stations : transportation and operation
Many challenges exist when considering nuclear power to provide electricity for bases on the Moon or Mars, including launch safety, landing safety, deployment, control, and protecting the astronauts from radiation. Examples from the past provide guidance in these areas but surface operations on …
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Design for Cost Methodology Applied to High Temperature Gas-Cooled Reactors
… of government contracting. Similarly, the nuclear industry produces and still designs Ferrari-like fission reactors, with high performance metrics in terms of power density and unit power, at a megaproject scale, but with high system and operational complexity, extreme development cost, …
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Quantum transport in strongly interacting, ultracold fermi gases in box potentials
… 𝑐 superconductors, twisted bi-layer graphene, nuclear fission, and neutron stars. In this thesis, I will describe the experiments we performed to measure the transport properties of a strongly-interacting atomic Fermi gas. This system features interactions as strong as allowed by quantum …
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Fission Multiplicity Distribution Sampling in MCNP6 Criticality Calculations
… to the average number of neutrons emitted in fission of the system. It can be shown that if the average number of neutrons emitted in fission and the average neutron energy spectrum is conserved, the criticality of a system remains the same without regard to the actual physical fission …
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Macrocyclic chemistry: Part I - Characterization of a mixed-valence di-iron complex and synthesis of a new poly-iron complex. Part II - Synthesis, characterization of new diphosphoester macrocyclic polyethers
… ( 90 Sr 2+ ) is a radioactive product ion from nuclear fission reactions. The Phosphorous containing macrocyclic poly-ether with 2 charges could form complexes with Strontium and are possible candidates for clean-up agents of radioactive materials. The synthesis of ionizable crown ethers is …
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Ionization Chamber Design, Development, and Testing for the UNM Fission Fragment Spectrometer
Fission fragment and product inventories play an important role in many areas of nuclear science from simulation of fissioning systems to active and passive interrogation of nuclear materials. The characteristic properties of fission fragment distributions are currently lacking in experimental …
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Nuclear Electric Propulsion with Low Enriched Uranium
… a reasonable mass and size in the medium term is nuclear fission. However, most proposed space fission systems' designs have opted for the technically desirable but politically problematic fuel choice of highly enriched uranium (HEU). Using low enriched uranium (LEU, 20% U-235 by mass) avoids many …
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Dynamic interactions between energetic D and He ions on lithium-tungsten plasma-facing interfaces
… abundant energy for the needs of the world is nuclear power. Nuclear fission is a well established method to produce energy without any greenhouse gases but nuclear fusion has the potential to produce even more energy per volume of fuel compared with nuclear fission and will produce less …
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Neutronic Characteristics of Using Zirconium Diboride and Gadolinium in a Westinghouse 17 X 17 Fuel Assembly
… materials that absorb the neutrons that cause a nuclear fission reaction and are consumed (burned) in the process. With a higher initial 235U fuel load, the burnable absorbers make it possible to extend the operating cycle while maintaining uniform power throughout the core. There are various …
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A fundamental analysis of means of producing and storing energy
… a new subcritical reactor design using an electronuclear driver and thermal transmutation of transuranic actinides.</p><p>The high energy density of liquid hydrocarbon fuels is ideal for transportation applications, but our ability to sustainably produce such fuels (i.e. biofuels) is limited by …
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Tritium Matters: Constructing Nuclearity and Navigating Ambivalence of a Unique Material
… Each phase is characterized by a dominant "nuclearity" and situated in context of "nuclear exceptionalism" (Hecht 2014) that directly and indirectly affects material conditions, elite decision-making, and radiological impacts on the environment and human health. Because it is pervasive, …
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Chromatographic Separation of Metals
In nuclear reprocessing, PUREX, a solvent extraction process, has long been the separation method employed for the separation of the bulk components of irradiated nuclear fuel (namely uranium and plutonium) from the fission products and other minor actinides produced during the fuel use. The …
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