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 67 for “"actinide"”.
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Actinide porphyrin complexes
The first bis(porphyrin)actinide complexes have been prepared by reaction of M(NEt$\sb2$)$\sb4$ (where M = Th, U) with H$\sb2$TPP or H$\sb2$OEP. The coordination geometry of (TPP)$\sb2$Th is a distorted square-prism where the thorium center is displaced 1.47 A from each of the porphyrin N$\sb4$ …
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Actinide minimization using pressurized water reactors
Transuranic actinides dominate the long-term radiotoxity in spent LWR fuel. In an open fuel cycle, they impose a long-term burden on geologic repositories. Transmuting these materials in reactor systems is one way to ease the long-term burden on the repository. Examining the maximum possible …
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Synthesis and evaluation of actinide imprinted resins
… shown good results with application to actinide separations. Large portions of recent research have been dedicated to the synthesis and evaluation of resins with phenolic-type functional groups. Other recent chemical research with lighter metals has developed a technique known as ion …
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Minor actinide waste disposal in deep geological boreholes
… suitable for the disposal of vitrified minor actinide waste in deep geological boreholes using conventional oil/gas/geothermal drilling technology. The nature of minor actinide waste was considered, paying particular attention to nuclides whose decay energy and half lives were of relative …
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The application of colloidal photocatalysis in actinide photoredox chemistry
… effluent streams. The selective manipulation of actinide metal oxidation states plays an important role in the purification/separation of target metal ions from process/waste streams during nuclear reprocessing. Thus, the technological objective of this project is to explore the use of …
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Transition metal and actinide complexes with unsymmetrical alkyl chelates
Submission published under a 24 month embargo labeled 'U of I Access', the embargo will last until 2026-08-01
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Structural and thermodynamic properties of sodium actinide ternary oxides
… since it is envisaged to incorporate minor actinides into the fuel to minimize the nuclear waste inventory. The poorly known structures of the Na- Np-O and Na-Pu-O phases diagrams, i.e., tetravalent $Na_2AnO_3$ (An=Np,Pu), pentavalent $Na_3AnO_4$, hexavalent $Na_4AnO_5$ and …
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Cluster model studies of nuclei in the actinide region
… core-cluster partitions of nuclei in the actinide region are found to give consistent results. As a by-product the techniques generate theoretical decay constants and energy spectra in good agreement with their experimental counterparts. The relationship implied by the binary cluster model …
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Computational investigations of the electronic structure of molecular actinide compounds
… thesis the electronic structure of a range of actinide compounds has been investigated using density functional theory. The reason for using DFT instead of other methods is mainly due to the size of the compounds which makes multireference calculations prohibitively expensive, but also to make …
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Determination of actinide elements in environmental samples by ICP-MS
Methods for the determination of the actinide elements in water, biological, soil and sediment samples have been developed using on-line solid phase extraction and high performance liquid chromatography (HPLC) coupled with inductively coupled plasma mass spectrometry (ICP-MS). Initial applications …
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Polyaminocarboxylic Acids as Potential Candidates for Trivalent Actinide/lanthanide Separations
… a phosphorous extractant to separate trivalent actinides (An(III)s) from trivalent lanthanides (Ln(III)s). Conversely, issues with these reagents have hampered TALSPEAK's implementation as an industrial scale solution. The process requires a high concentration of lactic acid to facilitate phase …
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Spectral characterization of actinide signatures for nuclear remote sensing applications
… signatures that may be generated from the actinide material and strongly emitting fission products in a nuclear fireball free from the interference of high explosives and engineering materials that may be present in the fireball produced from a conventional weapon. Experiments were …
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X-ray absorption spectroscopy of actinide speciation in solid solutions
It is widely recognized that the behavior of actinides in the environment is dictated by their speciation, or chemical form. It is therefore imperative to have a clear understanding of a waste form or environmental contaminant in order to effectively assess and treat the affected area. Current …
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Optimization of actinide transmutation in innovative lead-cooled fast reactors
… as efficient incinerators of plutonium and minor actinides (MAs) for application to dedicated fuel cycles for transmutation. A methodology is developed that assesses the actinide incineration performance of several transmutation fuel cycles, both single and multi-tiered, on the basis of …
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Modeling and Analysis of Actinide Diffusion Behavior in Irradiated Metal Fuel
… particularly in the area of constituent actinide diffusion behavior. The FEAST-Metal code calculations for this work were conducted at Los Alamos National Laboratory (LANL) in support of on-going activities related to sensitivity analysis of fuel performance codes. A sensitivity analysis …
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Analysis of the MIT research reactor fission product and actinide radioactivity inventories
… the list of contributory isotopes to include all actinide and fission product isotopes necessary for a proper accident source term calculation. The result is a power-history-dependent inventory that increases with bum-up, and comprises 41 actinide isotopes and 596 fission product isotopes. The …
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Used Nuclear Fuel Actinide Management in a Sodium- Cooled Heterogeneous Innovative Burner Reactor
… sodium-cooled fast reactor (SFR) for minor actinide (MA) destruction in used nuclear fuel (UNF). The destruction of MAs would reduce the radiotoxicity of the discharged waste to less than 25% of the once-through cycle after 100 years. The design can be achieved within the currently developed …
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Use of absorption laser-induced breakdown spectroscopy in characterization of actinide species and oxides
The student, Emily Weerakkody, submitted this Thesis for approval on 2018-12-10 at 17:23.
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Molecular dynamics simulation and topological analysis of the network structure of actinide-bearing materials
Actinide waste production and storage is a complex problem, and a whole-cycle approach to actinide management is necessary to minimize the total volume of waste. In this dissertation, I examine three actinide-bearing materials relevant to both the front end and back end of the nuclear fuel cycle: …
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