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 988 for “"isotopes"”.
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Nuclear Orientation of Cobalt Isotopes
Made available in DSpace on 2015-05-12T17:12:02Z (GMT). No. of bitstreams: 2 license.txt: 4848 bytes, checksum: 96035ab3f5e1c23cc7138a224ce498bd (MD5) 0018141.PDF: 3013863 bytes, checksum: d38000862416296a63d83da814ae6c4a (MD5) Previous issue date: 1956
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The marine biogeochemistry of chromium isotopes
In the ocean, chromium (Cr) is a redox-sensitive trace metal. The reduction of Cr(VI) to Cr(III) occurs in oxygen deficient zones (ODZs), and Cr reduction in general has been identified as a significant Cr isotope fractionation mechanism. This thesis presents the first Cr isotope variations (d53Cr) …
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The marine biogeochemistry of zinc isotopes
Zinc (Zn) stable isotopes can record information about important oceanographic processes. This thesis presents data on Zn isotopes in anthropogenic materials, hydrothermal fluids and minerals, cultured marine phytoplankton, natural plankton, and seawater. By measuring Zn isotopes in a diverse array …
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Plutonium isotopes in the North Atlantic
… an order-of-magnitude, but the 240Pu and 239Pu isotopes can be separated as well. The increased sensitivity for Pu provided by m.s. allowed me to measure Pu in deep-sea pore waters for the first time. Pore water studies are sensitive indicators of early diagenetic reactions, and can be used to …
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The marine biogeochemistry of zinc isotopes
Zinc (Zn) stable isotopes can record information about important oceanographic processes. This thesis presents data on Zn isotopes in anthropogenic materials, hydrothermal fluids and minerals, cultured marine phytoplankton, natural plankton, and seawater. By measuring Zn isotopes in a diverse array …
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The marine biogeochemistry of chromium isotopes
In the ocean, chromium (Cr) is a redox-sensitive trace metal. The reduction of Cr(VI) to Cr(III) occurs in oxygen deficient zones (ODZs), and Cr reduction in general has been identified as a significant Cr isotope fractionation mechanism. This thesis presents the first Cr isotope variations (653 …
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Plutonium isotopes in the North Atlantic
Thesis (Ph. D.)--Joint Program in Oceanography (Massachusetts Institute of Technology, Dept. of Earth, Atmospheric, and Planetary Sciences; and the Woods Hole Oceanographic Institution), 1986.
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Surface-cycling of rhenium and its isotopes
… of an analytical method for stable Re isotopes. Though complicated by analyte requirements and 187Re – 187Os decay, Re isotope measurements have a reproducibility of ±0.05h for analyte concentrations of 20 ng Re mL−1. Total Re isotopic variability to date is 0.9h. This includes 0.3h …
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Special isotopes of the FUGEN nuclear reactor
… bodies have shown dissimilarities between the isotopes considered to be of interest in decommissioning similarly styled heavy water reactors. This research examines the quantity of the isotopes that are of interest to the decommissioning of both the FUGEN nuclear power plant in Japan and the …
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Critical Field Measurements on Superconducting Lead Isotopes
Made available in DSpace on 2015-05-12T17:12:13Z (GMT). No. of bitstreams: 2 license.txt: 4848 bytes, checksum: 96035ab3f5e1c23cc7138a224ce498bd (MD5) 5900496.PDF: 3322884 bytes, checksum: b7acd5bdfe709a0feef86cb12bcf2c02 (MD5) Previous issue date: 1958
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Alpha-radioactive isotopes in the marine environment.
… also analysed for Pu-238, Po-210 and - those isotopes of thorium and uranium that are alpha-emitters. In some samples an estimate of the Ra-226 content was also made. The Pu-239 concentrations are compared with the values reported in the literature for similar organisms found in the …
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Surface-cycling of rhenium and its isotopes
… of an analytical method for stable Re isotopes.
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Independent fission yields of some xenon isotopes
Thesis (Ph. D.)--Massachusetts Institute of Technology, Dept. of Chemistry, 1962.
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The marine geochemistry of iron and iron isotopes
… Atlantic at 10°N, 45°W. Fractionation of iron isotopes could be an effective tool to investigate the geochemistr of iron. Trace metal clean plankton tows, river samples, aerosol leachates, and porewater samples were measured for their iron isotopic composition using a GV Instruments IsoProbe …
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The Biogeochemistry of Carbon Isotopes in Local Lakes
… influence of biogeochemical processes on carbon isotopes in local lakes. Crystal Lake is a small but deep glacial lake (12.5 acres, 11.9 meters). The study shows that during thermal stratification, the heaviest carbon can be found in the epilimnion near the surface, where photosynthesis dominates …
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The geochemistry of beryllium isotopes : applications in geochronometry
Thesis (Ph. D.)--Massachusetts Institute of Technology, Dept. of Earth, Atmospheric, and Planetary Sciences, and Woods Hole Oceanographic Institution, 1990.
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