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 16 of 16 for “"Fe concentration"”.
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The effect of carbon addition, pH and Fe concentration of microbial sulfate reduction and the subsequent precipitation of Fe and Mn from acid mine drainage in wetland mesocosms
… an average inflow pH of 7.0, and average inflow concentrations measuring 4 mg/L total Fe, 3 mg/L total Mn and 450 mg/L dissolved sulfate. An 18 month field study of water quality improvement and sulfate-reducing bacterial (SRB) populations revealed that the wetland was effectively treating the …
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Pressure dependence of spin fluctuations in metallic glasses Zrâ â Niâ â ,Zrâ â (Nix/Feâ â â -x)â â and /Zrx/feâ â â -x
… transition temperature Tc of metallic glasses ZrxFelOO-x (x=80, 75), Zr75(NixFelOO-x)25 (x=75, 50, 25), and CU2SZr75 were measured under quasi-hydrostatic pressure up to 8 OPa (80kbar). The volume (pressure) dependence of the electron-phonon coupling parameters Aep for CU25Zr75 was calculated …
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Determination of Iron and Iron-Binding Ligands In Seawater With Flow Injection Analysis and Voltammetry
… icebergs may serve as an important source of Fe to surrounding waters. I measured the concentrations and speciation of dissolved Fe via flow injection-chemiluminescence and cathodic stripping voltammetry (CSV) in the waters surrounding several icebergs during cruises to the Scotia and Weddell …
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Nikelio ir jo lydinių katalizatorių charakterizavimas ir pritaikymas vandens skaldymo reakcijoje /
This master thesis investigates the effectiveness of ternary nickel-iron-phosphorous (NiFeP) coatings as electrocatalysts for water splitting, targeting enhancements in hydrogen and oxygen production efficiencies. This study aligns with the 2020 European Union Hydrogen Strategy, which aims at …
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The role of the vasculature in iron allocation and sensing in plants
… dietary source for nutrients including iron (Fe). In terms of food security, and besides struggling to solve the problem of producing enough food for the rapidly growing population, we are also in need of finding solutions to fight the so-called "hidden hunger" or micronutrient deficiencies. …
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Studies on Molten Salt Fuels: Properties, Purification, and Materials Degradation
… corrosion tests, the salt flow with different velocities was simulated by rotating the stainless steel 316H (SS316H) specimens in molten NaF-KF-UF4 (FUNaK) contained in glassy carbon crucibles at 1073 K. Salt samples were intermittently collected to monitor concentration changes of …
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Roles of Nano- and Micro-Scale Subsurface Geochemical Reactions on Environmentally Sustainable Geologic CO2 Sequestration
… injection, geochemical reactions can affect the porosity, permeability, and pollutant transport in aquifers. Despite their importance, nano- and micro-scale subsurface geochemical reactions are far from well-understood.</p><p>Clay mobilization has been reported to decrease aquifer …
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Improved Management of Acid Sulfate Soils for Rice Production in Casamance, Senegal
… southern Senegal that traditionally produces rainfed rice, but Senegal produces only 1/3 of its rice consumption. Lowland areas, where rice is primarily produced, have acid sulfate soils with low pH and potential aluminum and iron toxicity. The goal of this work was to determine if soil amendments …
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Non-equilibrium spin accumulation in Co2FeMnSi/n-GaAs heterostructures
… studies of non-equilibrium spin accumulation in ferromagnet/n-GaAs heterostructures. This work naturally separates into two main topics: the first is the study of the non-equilibrium electron spin accumulation which is generated electrically by passing a current across the ferromagnet/GaAs …
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The chemistry of iron in hydrothermal plumes
… hydrothermal vents in the global marine Fe<br/>budget. While debate continues over the sources of dissolved Fe to the global deep-ocean<br/>dissolved Fe budget, it had been presumed, until recently, that all the Fe emitted from<br/>hydrothermal vents precipitates and sinks to the seafloor …
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Substitution and Disorder Effects in Ternary Intermetallics
… the investigation of substitution and disorder effects in ternary intermetallics. The crystal growth, crystal structure, and physical properties are reported on single crystals of Ln6W4-xAl43-yTx+y (Ln = Gd, Yb; T= Mn, Fe), LnCr2FexAl20-x (Ln = Yb, Gd), Sm1.33Pd3Ga8, and CeCo2-xMxAl8 (M = Mn, Fe, …
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Thermodynamic and kinetic studies of sulfur geochemistry
… which identified at least one thermodynamically feasible pathway for the overall reaction. The data were also used to construct an EhpH diagram for aqueous sulfur species with average sulfur oxidation states less than sulfate (VI). The structure-thermodynamic correlation was used to determine the …
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Acid deposition effects on soil chemistry and forest growth on the Monongahela National Forest
… are concerned about the possible deleterious effects of AD on the forest ecosystem. During the 2006 Forest Plan revision, evaluation of site sensitivity to acidification was specifically stated as a step in the Forest's adaptive management process. To meet this management objective, forest …
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Materials Development for the Fabrication of Metal-Supported Solid Oxide Fuel Cells by Co-sintering
… Although MS-SOFC can be fabricated by different routes, co-sintering of metal/anode/electrolyte multilayers in non-oxidizing atmosphere at high temperatures (1300 to 1400oC) is the most promising as far cost efficiency and industrial scale up is concerned. The cathode is usually applied …
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Defect engineering strategies for solar grade silicon and their optimization by predictive simulation
… solar cell producers. In this thesis, acceptable concentrations of different representative transition-metal impurities are calculated at different stages of the solar cell production chain: in the final device, in the multi-crystalline (mc) Si wafer, and in the Si feedstock material. Along the …
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LABORATORY AND FIELD INVESTIGATIONS OF COAL AND COAL PROCESSING WASTE - SIMULATION OF PRACTICES THAT MINIMIZE SULFATE AND CHLORIDE
… presence of carbonate and aluminum mineral buffering of pH; three stages were observed during the kinetic testing of the Springfield (No.5) coal (Stages 1 through 3). Conversely, only Stage 1 and Stage 2 were observed in leaching tests of coal refuse due to the greater amount of compaction, …