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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 21 for “"Metal distribution"”.
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Soil Metal Distribution in Parks and Playgrounds in Select Municipalities in Metro Vancouver
This study was conducted to identify the soil metal profile in parks and playgrounds in select municipalities in Metro Vancouver that have been rapidly developing during the past few years. Sixty-eight soil samples were analyzed for metals including As, Cd, Cr, Cu, Fe, Ni, Pb, Sn, U, V, and Zn by …
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Heavy Metal Distribution Across Three Georgia Estuaries Using Coastal Sharks As Sentinel Species
… number of anthropogenic impacts, including heavy metal contamination from human activities. However, few studies have examined heavy metal distribution within Georgia’s estuaries and how intact salt marsh ecosystems could play a role in filtering and sequestering contaminants, such as Mercury …
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Effect of Organic Amendments on Heavy Metal Distribution and Uptake in Vegetable Gardens in Senegal
… impacts due to the potential presence of heavy metals. The objective of this study was to assess the effect of organic amendments on heavy metal distribution in soils and vegetables in market gardens in Senegal. Organic amendments and soils samples were collected from four sites in eastern and …
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Heavy metal distribution in Wrigley Head, Moston Brook, Greater Manchester,Northwest England : implications for risk assessment and remediation
Heavy metal contaminated sites pose potential environmental and health problems and represent a great barrier to the beneficial use of contaminated sites. Therefore, the study of heavy metal contamination is a vital knowledge gap which, when filled, will facilitate development of sound management …
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The performance of structured cobalt catalysts in Fischer-Tropsch synthesis
Cobalt is the preferred catalyst metal for the production of clean burning, high cetane number diesel fuel from synthesis gas using the Fischer-Tropsch synthesis. Hence, increasing C5+ selectivity of cobalt catalysts is one of the hot topics in Fischer-Tropsch synthesis. Internal mass transport …
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Spatial Variability of Metals and Organic Carbon In Salt Marsh Sediment
… of pollutants in salt marsh, especially metals, have been widely studied due to their adverse effects on ecosystem. However, most of the studies use single measurement to assess the metal contamination and ignore the spatial variability of sediment metal concentration. In this study, I …
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Structure and activity relationships of bimetallic catalysts for aqueous phase reforming and the water-gas shift reaction
… have been promoted by addition of transition metal promoters Cu, Ni, Co, Fe, Mn, Mo, W, and Re in Pt:M 1:1 atomic ratios to give up to 13 times higher glycerol reforming site time yield (STY) and 8 times higher water-gas shift (WGS) turnover rate (TOR). The bimetallic structure and oxidation …
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Heavy metals in river sediments
… the River Cynon. The concentrations of heavy metals in the samples were determined by Atomic Absorption Spectroscopy after digestion of the dried sample. A rapid hydrochloric acid/hydrogen peroxide digestion was chosen after a brief comparison with the more traditional nitric/perchloric acid …
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Heavy metal adsorption on iron oxide and iron oxide-coated silica : macroscopic, spectroscopic, and modeling studies
To accurately model metal mobility and bioavailability in soils and sediments, systematic sorption studies are needed using representative and well-characterized minerals. Two important surfaces are iron oxide and silica, which are ubiquitous and associated with one another in the environment …
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Modeling contaminant transport and fate and subsequent impacts on ecosystems
Assessing risks associated with the release of metals into the environment and managing remedial activities requires simulation tools that depict speciation and risk with accurate mechanistic models and well-defined transport parameters. Such tools need to address the following processes: (1) …
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Spatially-resolved studies of nearby star-forming galaxies
… broader implications. The BCD NGC 4449 hosts a metal-poor central star-forming region, which I explain by various scenarios related to the interplay between star-formation, metal-distribution and gas dynamics within galaxies. The BCD NGC 4670 shows an unusual negative relationship between the …
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High-temperature defect engineering for silicon solar cells : predictive process simulation and synchrotron-based microcharacterization
… space can be pursued for a given starting metal concentration and distribution. To inform and test the model, synchrotron-based X-ray fluorescence is employed with beam spot sizes less than 200 nm to identify iron-rich precipitates down to 10 nm in radius in industrial and research …
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Characterization of Cu-rich aggregates in neurogenic niches of the rodent brain by X-ray fluorescence microscopy
… concentrations and has a spatially capricious distribution in the brain, determining concentrations has historically been challenging. X-ray fluorescence microscopy (XRF) offers excellent spatial resolution (down to 30~nm) and detection limits (sub parts per million), making it an excellent …
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Functional Characterization of Metallothioneins in Arabidopsis and Barley
<p>Metalothioneins (MTs) are metal binding proteins that can bind metals such as Cu, Zn, and Cd but the functions of MTs in plants are largely unknown. To understand the function of MTs in Arabidopsis, T-DNA insertion mutants lacking 4 MT genes including <em>MT1a, MT2a, MT2b</em> and <em>MT3</em> …
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Sediment geochemistry - a case study approach.
… methodological questions, the analysis of distribution patterns, determination of origins and the assessment of risks. Therefore, this research project adapted a case study approach and analysed several important aspects of contamination in sediments at a time. In case study 1, the …
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Metal impurities in n-type crystalline silicon for photovoltaics : simulation, synchrotron-based characterization, and mitigation
… mapping is used to non-destructively evaluate metal impurity evolution during processing. This thesis demonstrates that metal impurity redistribution during solar cell processing is similar in n- and p-type mc-Si but the relative electrical impact of point defect and precipitated impurities is …
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Structural and stratigraphic controls on mineralization at the George Fisher Zn-Pb-Ag Deposit, northwest Queensland, Australia
… their orogenic history. This study analyzes the distribution metal and oret ypes at the George Fisher deposit and investigates spatial and temporal relationships between high-grade mineralization and structures at all scales throughout the deformation history. The study aims to determine whether …
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A metallomic, proteomic and lipidomic investigation of the malaria parasites digestive vacuole and insights into the mediators of haemozoin formation
… focused on exploring the Plasmodium falciparum metallome and investigated the mediators of haemozoin formation, an ingenious parasite-specific process critical to host immune evasion as well as parasite survival and one that is surprisingly rather contentious. In order to obtain a comprehensive …
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The environmental fate of traffic-derived metals in a section of Wet Tropics World Heritage Area (WTWHA), Far North Queensland (FNQ)
… mobility and bioavailability of traffic-derived metals (Cd, Cu, Pb, Ni, Zn, Pd and Pt) in roadside environments in a section of the wet-dry tropics in northern Australia? Specific areas investigated included the Kuranda Range Road, northwest of the city of Cairns; the Captain Cook Highway at the …
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