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 9 of 9 for “"density fractions"”.
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The potential of QEMSCAN in predicting coal washability of Mpumalanga coals
… procedure to wash and dry the float and discard fractions is lengthy. QEMSCAN has the ability to characterise particle density based on the mineralogical composition of the particle. The objective of this research is to determine if QEMSCAN is a viable alternative to float and sink analysis. …
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Observations of Tropospheric and Stratospheric Bromine Monoxide from Satellite : Analysis of Satellite Data derived from GOME for 1996-2001
… separation of the stratospheric and tropospheric fractions of the total column density have been developed. The method relying on a fixed solar zenith angle interval has been used to study the evolution of stratospheric BrO abundances. As a result, it has been found in accordance with other …
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PAH and PCB distribution in sediment fractions and sorptive phases
… to contaminant distribution in the fine sediment fractions. Further, conventional distribution coefficients provide little information regarding the relative contaminant loading of each of the sorptive phases. Bioavailability of contaminants in oil and grease, soot and organic carbon, components …
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Multi-element isotopic analyses of presolar graphite grains from the Orgueil meteorite
… Orgueil. Graphite grains from low- and high-density fractions were analyzed for C, N, O, Si, Al-Mg, K, Ca, and Ti isotopes. These analyses indicate that isotopic properties are density dependent. Most low-density grains come from supernovae as indicated by large <super>18</super>O, …
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Distribution of gold in soils and stream sediments and the use of cyanidation in exploration geochemistry
… were also collected. After wet sieving into four fractions between 2000 μm (10 mesh, ASTM) and 53 μm (270 mesh, ASTM) and separation of heavy minerals (S.G. 3.3), samples were analyzed for gold by fire assay-atomic absorption spectroscopy (FA-AAS) and cyanide-AAS (CN-AAS). Results indicate that, …
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Characterizing Trace Element Associations in the Pittsburgh No. 8, Illinois No. 6 and Coalburg Coal Seams
… required the preparation of 11 different density fractions from a run-of-mine sample of 65 x 100 mesh Pittsburgh No. 8 coal. The samples were then examined using the scanning electron microscope (SEM) to establish the individual mineral constituents contained within each gravity fraction. …
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Turnover and fluxes of carbon and nitrogen in a spruce forest under natural and extreme meteorological conditions
… carbon (SOC) from different soil horizons and density fractions were investigated. A/W increased the DOC concentrations in the organic layer and upper mineral soil. More DOC was released from the organic layer to the mineral soil. However, the effects on total DOC leaching were smaller due to …
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Potential of above- and below-ground coarse woody debris as a carbon sink in managed and unmanaged forests
… of samples of logs was sampled to measure wood density and C concentration. In addition, radiocarbon analysis and dendrochronological cross-dating were used to determine the time of tree death for CWD logs. From these data, disappearance times were calculated for the three tree species. In the …