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 97 for “"total carbon"”.
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Forest soil and vegetation characteristics in two forest types following wildfire in the Shenandoah National Park, Virginia
… in the consumption of the entire forest floor. Total carbon, nitrogen, and nutrient differences between low and unburned areas for the entire forest floor (Oi-Oe + Oa) were negligible. However, loss of these constituents were much greater following high intensity fifes. Differences in the …
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Bromine Chloride Treatment of Aqueous Gasifier Effluent
… bromine chloride was unable to reduce the total carbon concentration of the wastewater to acceptable discharge or reuse levels.</p><p>Bromine chloride addition as an aqueous solution, a liquid, and a vapor was investigated. Bromine chloride vapor gave the largest total carbon removal. …
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An Assessment of the Contribution of Terrestrial Organic Matter to Total Organic Matter in Sediments in Scottish Sea Lochs
The biogeochemical cycling of carbon in Lochs Creran and Etive was investigated by using lignin as the biomarker for terrestrial organic matter. The oxygen uptake rate, percentage organic matter due to loss on ignition, Rp index, total carbon, total organic carbon (TOC), total nitrogen, …
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DESIGN OF AN EFFICIENT AND RAPID CHEMICAL VAPOR INFILTRATION (CVI) RE-CIRCULATION SYSTEM
Carbon-carbon (C/C, carbon fiber reinforced carbon matrix) composites are widely used in the aerospace industry because of the material's high temperature capability and structural properties. C/C maintains its mechanical and friction properties during extreme conditions so it is used extensively …
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Phosphate-mineral interactions and potential consequences for nutrient cycling
… pattern of phosphate fluxes relative to total carbon was observed from the sediments. These observations established the behavior of phosphate in coastal sediments as interconnected with the ongoing Fe-cycling in the sediments as well.
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Forensic Soil Analysis: Characterization of the Sand Fraction
… These techniques coupled with percent total carbon analysis (determined with a LECO CHN-1000) provide a method that measures three forensic properties instead of one for the forensic comparison of soil.
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Phosphate-mineral interactions and potential consequences for nutrient cycling
… pattern of phosphate fluxes relative to total carbon was observed from the sediments. These observations established the behavior of phosphate in coastal sediments as interconnected with the ongoing Fe-cycling in the sediments as well.
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Interannual Differences in Nutrient Dynamics During a Brown Tide Bloom (<i>Aureococcus anophagefferens</i>) and the Interaction of <i>A. anophagefferens</i> with Heterotrophic Bacteria
… which interannual differences in nitrogen and carbon uptake and concentrations of dissolved constituents were compared at two sites, one in Maryland and the other in Virginia. Overall, I observed an increase in bloom intensity and duration over time. No single nitrogen compound was responsible …
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Modern Foraminiferal Bio-facies within a Transgressive Saline Influenced Deltaic Headland, South-Central Louisiana
… delta region. Elevation, pore water salinity, total carbon, and mean grain size were compared with foraminiferal distributions in a transgressive marsh system of the lower Lafourche headland of the south-central delta plain. Cluster analysis aided definition of two biofacies, one from the marsh …
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Mass Balance of Major, Minor and Trace Elements During AFBC Combustion of Fuels
… FBC burns was determined by XRF analysis. The total carbon, inorganic carbon, and unburned carbon in the fly ashes were also determined. The combustion efficiency of the AFBC system was calculated by comparing the carbonto-iron ratios in the unburned fuel to that in the fly ashes.</p>
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Seasonal Pattern and Sources of Particulate Carbon in Kananaskis and Calgary, Alberta
Sources, seasonal pattern of elemental carbon(EC), organic carbon(OC), and total carbon from dry deposition and precipitation in Kananaskis and Calgary were assessed using thermo-optical methods. Vehicle exhaust was inferred to be dominant source of carbon throughout the year with an identical …
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Removal of refractory contaminants from mature landfill leachate utilizing fungi and evaluation of lignocellulosic enzymatic activity
… 52%, 54%, 60%, 58%, and 75% of COD, soluble COD, total carbon, total organic carbon, and color removal efficiencies at HRT 120 h and maximum enzymatic activities were 149, 27, and 16 U/L of Lac, LiP, and MnP, respectively. The findings seem to be promising for further exploration to enhance …
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The Effect of Carbon Dioxide Concentration on Calcification in the Red Coralline Alga BOSSIELLA ORBIGNIANA
… positively with HCO expressed as percent of total carbon. Maximum calcification of about one—third above normal occurred between 0.1% and 1.0% P CCOO22 At 0.26% P calcification increased as increments of NaHCO3 in the range from CO2' 1 to 8 mM were added; this increase did not occur in the …
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Embodied carbon: A framework for prioritizing and reducing emissions in the building industry
… known to be one of the largest contributors to carbon emissions—one of the key causes of climate change. Embodied carbon emissions of buildings are an often overlooked, but significant, influencer of a building’s overall carbon footprint. This gives rise to the need for improved life cycle …
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Life-cycle assessment of wastewater treatment plants
This thesis presents a general model for the carbon footprints analysis of wastewater treatment plants (WWTPs), using a life cycle assessment (LCA) approach. In previous research, the issue of global warming is often related to traditional industries with high carbon dioxide (CO2) emissions, such …
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Investigating carbon-capturing getter anode design using a fast computational tool
… because of their ability to use either hydrocarbons or pure hydrogen. However, introducing hydrocarbons to SOFCs has the negative effect of poisoning the anode of the SOFC with carbon molecules. These carbon deposits in the anode place mechanical stress on the anode and crack the anode …
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The Role of Autochothnous Production in the Formation of Dissolved and Particulate Organics in Laboratory Streams
… of dissolved and fine particulate organic carbon (DOC and FPOC) was studied in simplified communities in six laboratory streams. Production of DOC and FPOC by laboratory stream communities exposed to low (170 ft-c), intermediate (260 ft-c), and high (450 ft-c) light intensities was …
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Stratigraphy and sedimentology of the Tongue River formation (Paleocene), southeast Golden Valley County, North Dakota
… samples were collected and analyzed for total carbonate content, particle size, particle roundness, and mineral composition. In the area studied, the Tongue River Formation is 763 feet thick which is considerably thinner than in surrounding areas. The lower member of the Tongue River …
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The Potential for Carbon Sequestration in Soils on Lignite Coal Minelands in East Texas
… of forests to sequester large amounts of carbon in their above- and below-ground biomass as well as in the soils. It has been estimated that if the world's deforested lands were reforested and properly managed, they could have the potential to sequester five billion megagrams of carbon per …
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Summertime Carbon Dioxide Exchange over a Subarctic Sedge Wetland
<p>Measurements of net ecosystem carbon dioxide fluxes were made over a sedge fen, Churchill, Manitoba during the summertime period, 1994. This period, when compared to 50 year records (1943 to 1993), was warm and dry. The mean daily temperature was 2 "C warmer than normal. Total precipitation for …
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