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 49 for “"carbon concentrations"”.
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The Effect of Nitrates, pH, and Dissolved Inorganic Carbon Concentrations on the Extracellular Polysaccharide of Three Strains of Cyanobacteria Belonging to the Family Nostocaceae
… polysaccharides (EPS) in response to carbon and nitrogen availability as well as pH. While the carbohydrate compositions of the glycans produced by the different organisms were indicative of their recent evolutionary divergence, there were measurable differences that were dependent …
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Factors Affecting Denitrification Potential and the Microbial Ecology of Established Bioretention Cells Across the Eastern Mid-Atlantic Region
… cover, soil media nitrogen, and organic carbon concentrations are among the variables that facilitate nitrifying and denitrifying bacteria populations in BRCs. Bacterial community composition was most different between the top and bottom samples of the BRCs while fungal community …
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A mathematical model of coal-fired fluidised bed boilers
… of the model on variables such as the background carbon concentrations in the bed, and the transient response of heat evolution are studied. The mechanisms of solids mixing within the bed, combustion and the flow of heat to the boiler tubes are shown to result in a characteristic dynamic response, …
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Effects of feed oil content, transmembrane pressure and membrane rotational speed on permeate water quality in high-shear rotary ultrafiltration
… system. Permeate oil grease and total organic carbon concentrations increased with transmembrane pressure and feed oil content due to the increased density or thickness of the solute concentration boundary layer. However, hydraulic turbulence created by membrane rotation minimized the thickness …
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Detecting spatial variation in hydrology and carbon export across a lake-rich permafrost landscape, Old Crow Flats, Yukon, Canada
… of spatial patterns in hydrology and carbon export across OCF, using a suite of water chemistry parameters, carbon concentrations and water and carbon isotope tracers. The spatial patterns detected are providing an important reference for ongoing investigations of how changing climate …
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THE INFLUENCE OF SEASON, FLOW REGIME, AND WATERSHED LAND USE AND LAND COVER ON NUTRIENT DELIVERY TO TWO RAPIDLY URBANIZING WATERSHEDS IN CENTRAL INDIANA, USA
… input, and that phosphate and dissolved organic carbon concentrations will likely remain constant as the watershed is developed. Results also indicate that riparian buffer downstream of intense agriculture lands dilutes high agricultural NO3-N concentrations, but not enough to return in-stream …
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Impact of Road Proximity and other Determinants of Air Quality along Multi-Use Trails in the National Capital Region
… this study is to investigate the air pollutant concentrations on multi-use trails adjacent to different roadway classification and identify the factors that influence air quality in multi-use trails. I collected pollutant concentrations of PM2.5, particle number, and black carbon using mobile …
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Correlation of Electron Donor Concentrations in Sediments with Sediment Properties: New Providence, Iowa
The concentrations of electron donors in aquifer sediments are important in understanding the fate and transport of redox-sensitive constituents in ground water, such as nitrate. In this study, 50 sediment samples were collected from below the water table from 11 boreholes at the US Geological …
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Growth and Characterization of Carbon-Doped Aluminum(x) Gallium(1-X) Arsenide and Aluminum(x) Gallium(1-X) Phosphide
Carbon-doped GaAs and Al$\sb{\rm x}$Ga$\sb{\rm 1-x}$As with carbon concentrations ranging from 2 $\times$ 10$\sp $ cm$\sp{-3}$ to 3 $\times$ 10$\sp{20}$ cm$\sp{-3}$ have been characterized with Hall effect measurements, secondary ion mass spectrometry (SIMS), double crystal x-ray diffraction and …
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Physiological effects of heterologous expression of proteorhodopsin photosystems
… in viable cell yield of cultures grown in low carbon media. The light-dependent effect demonstrates a dependence on carbon, reducing at increasing carbon concentrations until no differential effect is observed. A survey of six PR-containing vectors from metagenomic libraries revealed PR …
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Low Carbon n-GaN Drift Layers for Vertical Power Electronic Devices
… reverse breakdown voltages of 5 kV or higher. Carbon serves as the primary compensating dopant in the growth process, incorporated into GaN during metalorganic chemical vapor deposition (MOCVD) growth. The level of carbon incorporation depends on several factors, including growth rate, ammonia …
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Assessing the photosynthetic impact of inorganic carbon in symbiotic dinoflagellates in culture and in coral host complexes
Increased atmospheric carbon dioxide concentrations are causing warming of the Earth's atmosphere and having significant effects on the chemistry of the oceans. Disruption to seawater biochemistry is causing associated pH change known as ocean acidification and increased concentrations of dissolved …
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A Synthesis and Optimization of Patented Direct Air Capture Technology
… technology to advance the state of the art in carbon removal to ameliorate the impacts of increasing carbon concentrations in the atmosphere.
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Carbon in Silicate Melt - Experimental Constraints and Applications for the Subduction Zone and Magma Ocean Carbon Cycles
… settings of the Earth throughout its history. Carbon concentrations and speciation were measured using FTIR, and in the process, we determined absorption coefficients for the CO2 species (CO2mol. and CO32-) for natural rhyolitic glass. We also developed empirical and thermodynamically-based …
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Nutrient Transport in the Lake Poinsett System
Concentrations and loads of nutrients transported through the Lake Poinsett system were monitored from April 1, 1970 to April 1, 1971. An annual 2.07x 10~ m3 surface discharge into Lake Poinsett transported 1.66 x 104 kg (PO4) phosphorus, 1.28 x 104 kg nitrate nitrogen, and 3.90 x 104 kg organic …
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Characterization of dissolved fluvial carbon from landscape characteristics across High Arctic headwater streams
Stream runoff is an important conduit of carbon from the terrestrial ecosystem to the Arctic Ocean, where fluvial carbon is a product of both the source and pathway of the stream network through a watershed. Small headwater streams in the High Arctic are understudied and account for a significant …
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Leaf nutrient draw back as a strategy for tree grass co-existence in the savanna biome
… tested by observing the seasonal variation in carbon and nitrogen concentrations in leaves and young twigs of two deciduous species, Combretum apiculatum and Terminalia sericea. The study was carried out in the sub-tropical savanna biome in southern Kruger National Park, South Africa. …
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Influence of stormwater control measures on watershed hydrology and biogeochemical cycling
… to determine how SCMs affect stream nutrient and carbon concentrations during storms, and how the extent and distribution of urban development modulates the effects of SCMs. Because of the limited ability for monitoring approaches to capture variability along a continuum of development and …
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Spatial and temporal dynamics of biogeochemical processes in the Fraser River, Canada : a coupled organic-inorganic perspective
… cycling of sediments and terrigenous organic carbon in a relatively pristine, large, temperate watershed. Sediments delivered by all tributaries have the potential to reach the ocean due to a lack of main stem lakes or impoundments, a unique feature for a river of its size. This study …
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Causes and consequences of prolonged dormancy: Why stay belowground?
… plants with low levels of stored available carbon are more likely to enter prolonged dormancy. Surprisingly, individuals increased their mobile carbon concentrations while dormant, presumably by remobilizing structural carbon into mobile forms. Since stored resources integrate past …
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