Dissertations / Theses on the topic 'Cadmium distribution'
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Pitcher, P. G. "Distribution of electrically active centres in boron implanted cadmium mercury telluride." Thesis, University of Surrey, 1986. http://epubs.surrey.ac.uk/847907/.
Full textMilton, Adrian Mark. "Heavy metals in contaminated grassland ecosystems : distribution, transfer and effects." Thesis, University of Liverpool, 1997. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.266222.
Full textNouri, Hassan. "Erosion and electrode energy distribution in switches with silver-cadmium-oxide contacts." Thesis, University of Plymouth, 1990. http://hdl.handle.net/10026.1/2391.
Full textDemuynck, Sylvain. "Identification des métalloprotéines (myohémérythrine et hémoglobine) liant le cadmium chez l'annélide polychète endobenthique Nereis diversicolor : distribution tissulaire et cinétique du métal en conditions expérimentales." Lille 1, 1992. http://www.theses.fr/1992LIL10120.
Full textWångstrand, Håkan. "Effects of nitrogen fertilization on the cadmium concentration in winter wheat grain : field studies on cadmium and nitrogen uptake and distribution in shoots as related to stage of development /." Uppsala : Dept. of Soil Sciences, Swedish University of Agricultural Sciences, 2005. http://epsilon.slu.se/9982614.pdf.
Full textPham, Thi Ngoc Diep. "Hépatotoxicité du cadmium : étude fondamentale du transport membranaire, de la distribution subcellulaire, et de l'apoptose dans des cultures primaires d'hépatocytes de rats /." Montréal : Université du Québec à Montréal, 2005. http://accesbib.uqam.ca/cgi-bin/bduqam/transit.pl?&noMan=24576816.
Full textVerstraeten, David. "Les II-VI photoréfractifs dans la bande 0,6 - 1,5 um pour l'enregistrement holographique dynamique." Phd thesis, Université Sciences et Technologies - Bordeaux I, 2002. http://tel.archives-ouvertes.fr/tel-00007635.
Full textMarrujo, Dan Madrid Savage Richard N. "Spectral conversion of light using cadmium selenium zinc sulfide core shell quantum dots to increase the efficiency of photovoltaic cells : a thesis /." [San Luis Obispo, Calif. : California Polytechnic State University], 2008. http://digitalcommons.calpoly.edu/theses/8/.
Full text"June 2nd, 2008." "In partial fulfillment of the requirements for the degree [of] Master of Science in Engineering with Specialization in Materials Engineering." "Presented to the faculty of California Polytechnic State University, San Luis Obispo." Major professor: Richard Savage, Ph.D. Includes bibliographical references (leaves 98-100). Also available online and on microfiche (2 sheets).
Luo, Chen. "Distribution and mobilization of heavy metals at an acid mine drainage-affected region, South China." Thesis, Linköpings universitet, Tema Miljöförändring, 2020. http://urn.kb.se/resolve?urn=urn:nbn:se:liu:diva-163084.
Full textKirby, Jason K., and n/a. "Trace metal and metalloid accumulation, distribution, and, speciation in Lake Macquarie, N.S.W., Australia." University of Canberra. Resource, Environmental & Heritage Sciences, 2005. http://erl.canberra.edu.au./public/adt-AUC20051129.124508.
Full textChan, Debbie Yvonne. "The influence of life stage and cultivar on the distribution of cadmium in durum wheat (Triticum turgidum L. var durum, cvs Kyle and Arcola)." Thesis, National Library of Canada = Bibliothèque nationale du Canada, 1997. http://www.collectionscanada.ca/obj/s4/f2/dsk2/ftp04/mq24451.pdf.
Full textPaveley, C. F. "Heavy metal sources and distribution in soils, with special reference to Wales : Background ranges, threshold concentrations and sources of lead, zinc, copper, cadmium, cobalt, nickel, manganese and iron in A and B soil horizons." Thesis, University of Bradford, 1988. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.233744.
Full textIkehata, Mariko. "Evaluation of trace metal distributions (arsenic, cadmium, lead) and lead sources in sediments from a sound and an inlet on the west coast of Vancouver Island, British Columbia." Thesis, University of British Columbia, 2013. http://hdl.handle.net/2429/45731.
Full textCaetano, Ana Luísa Neto. "Derivation of soil screening values for metals in Portuguese natural soil." Doctoral thesis, Universidade de Aveiro, 2014. http://hdl.handle.net/10773/13764.
Full textThe increasing human activity has been responsible by profound changes and a constinuos degradation of the soil compartment in all the European territory. Some European policies are appearing focusing soil’s protection and the management of contaminated sites, in order to recover land for other uses. To regulate the risk assessment and the management of contaminated soils, many European member states adopted soil guideline values, as for example soil screnning values (SSV).These values are particularly useful for the the first tier of the Ecological Risk Assessment (ERA) processes of contaminated sites,especially for a first screening of sites requiring a more site-specific evaluation. Hence, the approriate definition of regional SSVs will have relevant economic impacts in the management of contaminated sites. Portugal is one of European Member States that still lack these soil guideline values. In this context, this study gaves a remarkable contribution in the generation of ecotoxicological data for soil microbiological parameters, terrestrial plants and invertebrates for the derivation of SSVs for uranium (U), cadmium (Cd) and copper (Cu), using a Portuguese natural soil, representative of a dominant type of soil in the Portuguese territory. SSVs were derived based on two methods proposed by the the Technical Guidance Document for Risk Assessment of the European Commission; namely the assessment factor method (AF) and the species sensitivity distribution (SSD) method (with some adaptations). The outputs of both methods were compared and discussed. Further, this study laid the foundation for a deeper reflection about the cut-off (hazard concentration for a given percentage of species - HCps) to be estimated from the SSDs, and to be selected for the derivation of SSVs, with the adequate level of protection. It was proven that this selection may vary for different contaminants, however a clear justification should be given, in each case. The SSvs proposed in this study were for: U (151.4 mg U kg-1dw), Cd (5.6 mg Cd kg-1dw), and Cu (58.5 mg Cu kg-1dw) These values should now be tested for their descriminating power of soils with different levels of contamination. However, this studies clarifies the approach that should be followed for the derivation of SSVs for other metals and organic contaminants, and for other dominant types of Portuguese natural soils.
O aumento das atividades humanas tem sido responsável por mudanças profundas e por uma degradação contínua do compartimento solo, em todo o território Europeu. Em resposta a este problema, algumas políticas Europeias estão agora a emergir orientadas especificamente para a proteção do solo e para a gestão das áreas contaminadas, a fim de recuperar os solos degradados para outros usos. Para regulamentar a avaliação de risco e a gestão de solos contaminados, muitos Estados-Membros Europeus adoptaram valores de qualidade do solo, como por exemplo os “valores de rastreio ou triagem” (do inglês: soil screening values ou SSVs). Estes valores são particularmente úteis para a primeira etapa dos processos de avaliação de risco ecológico (ARE) de locais contaminados, especialmente para um primeiro rastreio dos locais, destinado a separar aqueles em que os riscos são claramente reduzidos daqueles que exigem uma avaliação mais específica e aprofundada para o local. Assim, a definição de SSVs regionais terá impactos económicos relevantes na gestão dos locais contaminados. Portugal é um dos Estados-Membros Europeus que ainda não definiu SSVs. Neste contexto, este estudo dá uma notável contribuição na geração de dados ecotoxicológicos para parâmetros microbiológicos do solo, plantas terrestres e invertebrados necessários para a obtenção de SSVs para urânio (U), cádmio (Cd) e cobre (Cu), utilizando um solo natural Português, representante de um tipo dominante de solo existente no território nacional. Assim, foram obtidos SSVs para os metais referidos com base em dois métodos propostos pelo Documento de Orientação Técnica para Avaliação de Riscos da Comissão Europeia, nomeadamente o método dos factores de avaliação (do inglês: assessment factors ou AF) e o método probabilístico da distribuição da sensibilidade espécies (do inglês: species sensitivity distributions ou SSDs) (com algumas adaptações). Os resultados dos dois métodos foram comparados e discutidos. Além disso, este estudo lançou as bases para uma reflexão mais profunda sobre o ponto de corte (concentração de risco para uma determinada percentagem de espécies) a ser estimado a partir das distribuições de sensibilidade das espécies (SSDs), e para ser selecionado para a obtenção de SSVs, com o nível adequado de proteção. Neste estudo foi comprovado que esta seleção pode variar para diferentes metais ou outros contaminantes, no entanto, uma justificação clara deve ser dada, em cada caso. Os SSvs propostos neste estudo foram de: U (151,4 mg U kg- 1ms ), Cd (5,6 mg Cd kg- 1ms ) e Cu ( 58,5 mg Cu kg- 1 ms) Estes valores devem agora ser testados quanto à sua capacidade para descriminar solos com diferentes níveis de contaminação. No entanto, este estudo esclarece e sugere a abordagem que deve ser seguida para a derivação de SSVs para outros metais e contaminantes orgânicos, e para outros tipos dominantes de solos naturais portugueses.
Thomas, Merrine. "Factors Affecting Cadmium Uptake and Distribution in Barley." Thesis, 2019. http://hdl.handle.net/2440/119949.
Full textThesis (Ph.D.) -- University of Adelaide, School of Biological Sciences, 2019
Jackson, Sarah. "The distribution of dissolved cadmium in the Canadian Arctic Ocean." Thesis, 2017. https://dspace.library.uvic.ca//handle/1828/8920.
Full textGraduate
Yang, Song-Yue, and 楊松岳. "Simulate Cadmium Transport and Classify Standard of Cadmium in soil by Thermodynamics Theory and Finite Mixture Distribution Theory." Thesis, 1999. http://ndltd.ncl.edu.tw/handle/07388797442556072899.
Full text國立臺灣大學
農業工程學研究所
87
The miscible displacement is a traditional theory to describe transport of ion in the soil. Concentration curves always consider as a S type break through with pore volume. However cadmium ions which have strong tending to retain in soil are not fit in this traditional theory. The purpose of this study is applying concept of thermodynamics to devise a new model. The new model show as follow-model .Several experiment results are counted to verify this model, and show reasonable agreements. The criteria of soil pollution are the legal lattice standard for government to execute the soil pollution prevention. In 1993, Environment Protection Agency tried to establish the standard of heavy metal quantity of the soils in Taiwan. However, above standard doesn''t include cadmium distribution in soil by natural process or pollutant effect. This study use finite mixture distribution theory to classify cadmium concentration in and establish standard. The result counted at last can group the cadmium quantity of soils in Taiwan into a one level which is 0~0.368mg/kg in background and five levels in the polluted soil, including 0.368~1.123mg/kg, 0.123~2.515mg/kg, 2.515~4.283mg/kg, 4.283~5.170mg/kg and over 5.170mg/kg. The boundary between the cadmium quantity within the normal soils and the one within the polluted soils is 0.368 mg/kg. Moreover, we suggest pollution value can be stipulated as 1 mg/kg.
Swinden, Lindsay Brownlees. "Effect of processing on the distribution of cadmium in wheaten products." Thesis, 2006. https://vuir.vu.edu.au/15706/.
Full textChen, Wei-ting, and 陳維婷. "Cadmium distribution and its effects on morphology and physiology in Zinnia elegans." Thesis, 1997. http://ndltd.ncl.edu.tw/handle/59406433805697516270.
Full text國立臺灣大學
植物學系
85
Cadmium toxicity was reflected on morphological and biological change . The major morphological abnormalities of cadmium-treated plants were the retardation of plant growth, chlorosis of leaves (especially young leaves), and earlier senescence of old leaves. The time for toxicity expression was reversed to cadmium concentration in solution. Cadmium affected plants showed that chloroplast abnormalities in mesophyll of leaf, such as the swelling and looseness of thylakoid membrane ,and reduction of stack disc of thylakoid in grana. But the effects of cadmium on chloroplasts in vascular bundles of stems were not so prominent. Transfer cells were not only found in phloem tissues and minor veins of vascular bundles, they were also found in xylem tissues nearly vessels in stems of cadmium-treated plants. However, they were not found in roots and leaves of cadmium-treated plants. The distribution of cadmium was mainly in root. The accumulation of cadmium in stems was higher than that in leaves. Cadmium accumulation ability of young leaves was much higher than that of older leaves. The isozyme patterns of superoxide dismutase, peroxidase and acid phosphatase were also altered by the duration of cadmium treatment.
Jennett, Tyson. "The Role of Xylem in the Differential Accumulation of Cadmium in Soybean Cultivars." Thesis, 2011. http://hdl.handle.net/10214/2805.
Full textCHANG, JIE-CHENG, and 張傑誠. "The Spatial Distribution of Iron and Cadmium in a Submerged soil under the Influence of Rice Roots." Thesis, 2016. http://ndltd.ncl.edu.tw/handle/66565347196603514161.
Full text國立臺灣大學
農業化學研究所
104
When a soil is under submerging condition, the water layer above the soil cuts off the oxygen supplying from the air. As a consequence, anaerobic respiration of soil microbial drives the occurrence of a series of reduction reactions. The excretion of oxygen from rice roots result in the oxidized condition in the rice rhizosphere, which may result in a redox gradient from rice rhizosphere to bulk soil. Therefore, it is hypothesized that this redox gradient may lead to the spatial distribution of iron and cadmium between rice rhizosphere and bulk soils, and subsequently affect their uptakes by rice roots. Soil incubation and rhizobox experiments were applied to the study the concentration of iron and cadmium in soil solution as a function of time, and the spatial distributions of iron and cadmium in soil solution, respectively. The results of soil incubation experiment showed that the concentration of ferrous ion in soil solution increased with the time of submergence, while the concentration of cadmium decreased gradually. The difference between the redox conditions in the rhizosphere and bulk soils induced the accumulation of iron in the rhizosphere of rice. The linear combination fitting (LCF) results of Fe k-edge XANES spectra of the soil samples shows that the formation of lepidocrocite in the rhizosphere (63.1 %) was higher than that in the corresponding bulk soil (45.7 %). Accordingly, ferrous ions were oxidized in the rice rhizosphere, leading to precipitation of Fe in the rice rhizosphere, On the other hand, the decrease of Cd concentration in soil solutions from the bulk to rhizosphere soils indicated the absorption of cadmium by ferric hydroxides. In addition, the concentration of sulfate in the rice rhizosphere was higher than the counterpart in the bulk. This indicates that the oxidation of reduced S species (e.g., CdS) in rice rhizosphere may be responsible for the release of Cd, which was then absorbed by rice roots.
CHEN, HONG-YU, and 陳宏瑜. "Vertical distribution of cadmium in the Philippine Sea, the South China Sea and the East China Sea." Thesis, 1992. http://ndltd.ncl.edu.tw/handle/16909140786688870649.
Full textBachoo, Santosh. "Experimental cadmium contamination of the echinoid Stomopneustes variolaris (Echinodermata: Echinoidea) : influence of dosage and distribution of the metal in the organism." Thesis, 2002. http://hdl.handle.net/10413/10372.
Full textThesis (M.Sc.Eng.)-University of Durban-Westville, 2002.
Janssen, David. "Investigating the distributions of zinc and cadmium in the subarctic northeast Pacific Ocean." Thesis, 2017. http://hdl.handle.net/1828/7851.
Full textGraduate