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 433 for “"Trace Element"”.
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Trace element metabolism in human pregnancy.
… investigate the dietary intake of the essential trace elements, zinc and copper during pregnancy, ii. to assess the possible effects of these intakes on the outcome of pregnancy. iii. to study the absorption and retention of zinc, copper and manganese in normal primigravidae and those at risk of …
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Trace element concentrations in melanotic swine
It is believed that the presence of certain trace elements in the skin may play an important role in the formation of melanomas. In this work, neutron activation analysis and x-ray fluorescence analysis were used to determine trace element concentrations in cancerous, noncancerous and normal swine …
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Trace element analysis of bighorn sheep horns
… from nine locations. The concentrations of eight elements were determined in all samples by inductively coupled argon plasma spectroscopy. Year of horn growth was determined for 154 of the samples. All elements of concentrations varied significantly with respect to location. Some elements varied …
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Trace element geochemistry of marine biogenic particulate matter
… necessary to prevent contamination for major and trace-chemical analysis. Immediately after collection, the samples were subjected to a series of physical and chemical leaching-decomposition experiments designed to identify the major and trace element composition of particulate carrier phases. …
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Trace Element Geochemistry of Compositionally Layered Impact Spherules
… Mass Spectrometry (LA-ICP-MS) to measure major, trace, and rare earth element (REE) concentrations. Backscatter Electron (BSE) images and elemental X-ray maps indicate a range of compositional differences between the inner and outer layers of type 4b spherules. The majority of REE plots have …
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Investigations of Trace Element Titanium in Silica Minerals
… experiments that quantify and define the trace-element solubility behavior of titanium (Ti) in the silica minerals quartz and coesite, to advance the understanding and application of trace-element thermobarometry.Chapter 1 details the experiments that were conducted to quantify the …
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Identification of platinum ores via trace element signatures
This project studies the natural variation in the elemental composition of processed platinum ore from different extraction locations in South Africa in order to assess whether this provides sufficient information for the elemental fingerprinting" of the material.
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Trace element geochemistry of marine biogenic particulate matter
Thesis (Ph.D.)--Massachusetts Institute of Technology, Dept. of Earth and Planetary Sciences, 1981.
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Trace element signatures of Peruvian and Chilean upwelling sediments
… carbon cycle. Bulk sediment redox/bio-sensitive trace elements - promising tracers for (paleo) environmental reconstructions - were studied with respect to the influence of surface water productivity, early diagenetic OM remineralisation, sulfate reduction and pyrite formation. The context …
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Trace element contaminants in the Kuwait water production system
… blended water containes organic, inorganic and trace metal impurities within the recommended international standard limits. The purpose of this work is to identify the source of selected trace metals present in the drinking water in Kuwait. Chromium, copper, iron, lead, manganese, nickel, …
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Canadian precambrian iron-formations: ages and trace element compositions,
Thesis (Ph. D.)--Massachusetts Institute of Technology, Dept. of Earth and Planetary Sciences, 1971.
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Trace element zoning in garnets--implications for metamorphic petrogenesis
Thesis (Ph. D.)--Massachusetts Institute of Technology, Dept. of Earth, Atmospheric and Planetary Sciences, 1988.
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Trace element distribution in sediments of the Mid-Atlantic Ridge
Thesis (Sc. D.)--Massachusetts Institute of Technology, Dept. of Earth and Planetary Sciences, 1970.
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A Systems Analysis of Trace Element Cycling in the Great Lakes
… patterns and natural cycles of various chemical elements, however current baseline concentrations remain unknown and biogeochemical controls underlying their sources, mobility, and fate remain unknown. This thesis utilizes an environmental systems approach to investigate three topics: 1) …
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Biogeochemical Transformations of Trace Element Pollutants During Coal Combustion Product Disposal
… contaminant mobility, particularly for the toxic elements such as mercury, arsenic, and selenium. This dissertation research focused on the biogeochemical transformations of mercury, arsenic, and selenium associated with coal ash materials in an effort to: (1) define the key environmental …
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Fluid inclusion and trace element study of the Comstock district, Nevada
Includes bibliographical references (pages 115-112).
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Trace element distributions and the origins of some New England granites.
Thesis (M.S.)--Massachusetts Institute of Technology, Dept. of Earth and Planetary Sciences, 1970.
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Measuring Trace Element Concentrations in Artiodactyl Cannonbones using Portable X-Ray Fluorescence
… portable X-ray fluorescence (pXRF) to measure trace element concentrations in comparative collection and archaeological bone samples. Using cannonbones from five different artiodactyl species, I collected trace element data from 50 comparative collection specimens and 18 archaeological …
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