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 10 of 10 for “"Light Fraction"”.
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Sequestration and Characterization of Soil Organic Carbon for Shelterbelt Agroforestry Systems in Saskatchewan
… of SOC was characterized by using the density fraction technique to separate SOC into uncomplexed, plant-derived debris (i.e. light fraction) and mineral-associated organic matter (i.e. heavy fraction). Changes in SOC composition due to shelterbelt plantation were studied using attenuated total …
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Direct liquefaction of coal with coal-derived solvents to produce precursors for carbon products
… Technical Services, Inc. and split into three fractions, the original liquid (RACL), its heavy fraction (DACL-H), and its light fraction (DACL-L). The other two liquids were heavy creosote oil (HCO) and carbon black base #1 (CBB) from Koppers Industries, Inc. These liquids were used as …
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Soil Organic Matter Dynamics in Cropping Systems of Virginia's Valley Region
… of density solutions used in recovering free-light fraction (FLF) organic matter; ii) compare different soil organic fractions as sensitive indices of short-term changes in SOM due to management practices; iii) investigate on-farm effects of tillage management on soil organic carbon (SOC) and …
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Effect of Forage Stand Termination Method and Fertilization History on Greenhouse Gas Emissions, Nutrient Supply Rates, and Soil Carbon Dynamics
… emissions of both CO¬2 and N2O, as well as slightly lower phosphate (PO43-) supply rates in the surface soil. Nitrogen supply rates were generally increased by N past fertilization, especially the ammonium (NH4+) supply rate, which was as much as 18% higher than in unfertilized plots. The …
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Belowground Carbon and Nitrogen Cycling in a Loblolly Pine Forest Managed for Bioenergy Production
… treatment. Average C concentration for aggregate fractions was significantly lower in beds of the pine-switchgrass treatment at 0-5, 15- 30, and 30-45 cm depths, amounting to ~23%, ~28%, and ~34% reduction, respectively. Values of δ 13C for the >2000 µm aggregate size fraction at the 0-5 cm depth …
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A study of configurational alternatives of a gas-to-liquids process based on Fischer-Tropsch technology
… oil prices are some of the factors that highlight the need for alternative and environmentally friendly routes to fuels. One alternative is to use Fischer-Tropsch Synthesis (FTS) as the major technology in conversion of carbon containing feedstock to transportation fuels. The FTS product, …
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Collective charged particle dynamics in relativistically transparent laser-plasma interactions
… for linearly and circularly polarised laser light. However, for a given target thickness, the linear polarisation case exhibits a significantly higher transmission fraction, with respect to the circular polarisation case, due to additional electron heating and expansion. Moreover, it is shown …
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Effects of land-use practice on wetland soil hydrology, salinity, and biogeochemistry in the prairie pothole region
… (N, P, K, and S), and SOC content with different fractions and chemical compositions in soils (60-cm depth) collected along transects during the first rotation (3-year cycle) and compared with adjacent annual crop (AC), and pasture (PA) in two (site A and B) semi-arid prairie pothole region (PPR) …
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Feeding the soil to feed the planet: soil health outcomes from novel amendments to residue management
… decomposition and accumulation via different SOM fractions. I collected soils from the field and split them to add 13C lactobionate to some soils and water only to other soils. I found that about 53% of added lactobionate was respired over 84 days, and observed a positive priming effect after 14 …
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Potential of above- and below-ground coarse woody debris as a carbon sink in managed and unmanaged forests
… organic C concentration was measured. Density fractionation in three fractions (<1.6 g cm-3, 1.6-2.0 g cm-3, >2 g cm-3) was carried out for one mixed sample of each soil depth. Radiocarbon signatures were measured of the mixed samples as well as of each fraction. The SOC stocks showed greater …