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.
Results
Showing 1 to 20 of 549 for “"uranium"”.
-
Biosorption of uranium and its effect on uranium transport in groundewater
… has been explored as a remediation method for uranium-contaminated groundwater at U.S. Department of Energy sites with promising results. Although transport models have been improved to include variations in geochemical concentrations, reductive microbial processes, and adsorption of uranium to …
-
Essays on uranium enrichment.
Thesis. 1979. Ph.D.--Massachusetts Institute of Technology. Alfred P. Sloan School of Management.
-
Uranium isotopes as indicators of uranium immobilization and remobilization in contaminated aquifer settings
Tracking U immobilization through U(VI) reduction and mobilization induced by U(IV) oxidation using U concentrations alone is challenging, as groundwater transport, aquifer heterogeneity, and U(VI) adsorption can complicate data interpretation. U isotopes (238U/235U) provide a more direct indicator …
-
The behavior of uranium in the environment : bacterial reduction of an aqueous uranium species
… were performed to investigate the behavior of uranium with bacteria in an anaerobic environment. Laboratory studies used Shewanella putrefaciens because of its ability to grow rapidly in aerobic conditions and reduce metals in anaerobic conditions. Under anaerobic conditions, Shewanella …
-
Geotechnical Investigation of Uranium Tailings
With the increasing uranium demand for power generation, the mining industry is considering expansion of existing facilities. The management of tailings, generated as a by-product of ore beneficiation, in containment structures is particularly important to minimize the environmental footprint. A …
-
Unconventional Superconductivity in Uranium Ditelluride
… investigates the heavy fermion compound uranium ditelluride (UTe2), one of the most promising candidates for spin-triplet superconductivity. UTe2 exhibits extremely high upper critical fields of up to 70 Tesla, minimal change in the local spin susceptibility upon the crossing …
-
The source of uranium and vanadium at the Langer Heinrich and Klein Trekkopje uranium deposits-genesis and controlling factors for uranium mineralization, Western Namibia.
The Langer Heinrich and Klein Trekkopje U deposits are located within the Namib Desert in Central Namibia. Both deposits are hosted by calcretes developed within palaeo-channel systems of Tertiary age. The sources of both U and V in the two deposits and the reasons why the two deposits differ in …
-
Global terrestrial uranium supply and its policy implications : a probabilistic projection of future uranium costs
An accurate outlook on long-term uranium resources is critical in forecasting uranium costresource relationships, and for energy policy planning as regards the development and deployment of nuclear fuel cycle alternatives. In this study, which was part of the MIT Study on the Future of the Nuclear …
-
Isotopic study of uranium: determining the isotopic fractionation of uranium during abiotic reduction with iron(II)
Uranium is a contaminant of interest due to its toxicity and mobility in groundwater. It is a redox active element in which the oxidation state can change by the addition or removal of electrons. In one method of groundwater remediation, mobile, hexavalent uranium (U(VI)) can be reduced to …
-
Uranium plant identification using correlation methods
Theory relating to identification of an uranium plant using on-line correlation techniques is described. Generation and properties of pseudorandom ternary m-sequences are discussed, particular attention being given to selection of a suitable sequence for testing a system. The geometry and control …
-
Optical Line Radiation From Uranium Plasmas
Made available in DSpace on 2014-12-14T06:26:04Z (GMT). No. of bitstreams: 1 7726707.pdf: 4318546 bytes, checksum: d577931c537335b244066f09ae81f5dc (MD5) Previous issue date: 1977
-
Elasticity and Anelasticity of Uranium-Oxides
Made available in DSpace on 2014-12-10T17:32:35Z (GMT). No. of bitstreams: 1 6607741.pdf: 4520545 bytes, checksum: a3f1d324db2dde67dd3f66a118d426b5 (MD5) Previous issue date: 1966
-
Uranium Enrichment Signatures of Fluorinated Epoxy
… such techniques for the production of enriched uranium, despite the fact that many nations have used uranium enrichment to acquire weapons. Through the use of Fast Scanning Calorimetry, this thesis shows that alpha radiation from uranium can cause a detectable change in the glass transition …
-
Pattern recognition applied to uranium prospecting.
Thesis. 1978. Ph.D.--Massachusetts Institute of Technology. Dept. of Earth and Planetary Science.
-
Interaction of methoxyethyl methyl imidazolium-based ionic liquids with uranium and its effect on bioreduction of uranium
… resonance). The interaction between ILs and uranium has been explored by various analysis techniques, including pH, potentiometric titration, UV-vis, MS and EXAFS (extended x-ray absorption fine structure). Among all the ILs studied here, MOEMIMBF_4 demonstrated a strong complexation with …
-
Chromium and uranium isotopic exchange kinetics and isotope fractionation during oxidation of tetravalent uranium by dissolved oxygen
Chromium (Cr) and Uranium (U) isotopes (53Cr/52Cr and 238U/235U ratios) are very powerful new geochemical tools in environmental remediation and paleoredox reconstruction studies. Correctly interpreting Cr and U isotopic compositions in groundwater and sed- imentary rock samples requires thorough …
-
Examination of the conversion of the U.S. submarine fleet from highly enriched uranium to low enriched uranium
… are currently fueled by highly enriched uranium (HEU), but HEU brings administrative and political challenges. This issue has been studied by the Navy before, and promising new fuel technology developments, combined with new motivations, warrant a fresh look at low enriched uranium (LEU). …
-
Octupole degrees of freedom in Uranium-230
The nuclei230U and232U were considered to possibly have tetrahedral shape because their negative-parity bands lacked in-band E2 transitions. From a study about the implications of tetrahedral shapein230U and232U [7], it was discovered that these bands were better described as octupole …
-
Nuclear Electric Propulsion with Low Enriched Uranium
… problematic fuel choice of highly enriched uranium (HEU). Using low enriched uranium (LEU, 20% U-235 by mass) avoids many of the security costs and public perception issues associated with HEU but has implications for the power system design. The core will require more fuel and/or a …
-
The Chemical-Induced Genotoxicity of Depleted Uranium
Uranium has been mined for many years and used for fuel for nuclear reactors and materials for atomic weapons, ammunition, and armor. While the radioactivity associated with uranium mining has been linked to the development of lung and kidney cancers, and leukemia, little is known about the direct …
Page 1 of 28