Дисертації з теми "Chemical Significance"
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Ismail, Baraem. "Dates : physico-chemical characteristics, total quality and nutritional significance." Thesis, University of Central Lancashire, 2003. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.275924.
Повний текст джерелаBalasubramanian, Priya. "Characterization and Significance of Circulating Tumor Cells in Patients Obtained Using a Negative Depletion Technology." The Ohio State University, 2010. http://rave.ohiolink.edu/etdc/view?acc_num=osu1288151816.
Повний текст джерелаSyed, Hassan Syed Shatir Asghrar. "Significance of surface-generated radicals in the gas-solid catalytic reactions." Thesis, Curtin University, 2010. http://hdl.handle.net/20.500.11937/203.
Повний текст джерелаShilton, Vaughan Francis. "The significance of indoor:outdoor relationships, and physical and chemical composition in personal exposure to urban particulate matter." Thesis, University of Wolverhampton, 2003. http://hdl.handle.net/2436/88474.
Повний текст джерелаCallicoat, Jeffrey Scott. "Significance of Mid-Miocene volcanism in northeast Nevada: petrographic, chemical, isotopic, and temporal importance of the Jarbidge Rhyolite." Thesis, Kansas State University, 2010. http://hdl.handle.net/2097/6242.
Повний текст джерелаDepartment of Geology
Matthew E. Brueseke
The Jarbidge Rhyolite of Elko County, Nevada, is approximately 26 mapped bodies of porphyritic rhyolite. Several of the bodies are truncated by the Idaho or Utah border, and extend into the states for an unknown distance. This study focuses on five bodies, the Mahoganies, two near Wild Horse Reservoir, the outcrop enclosing the Jarbidge Mountains, and one outcrop south of Wells. The study’s focus is providing field, petrography, geochemistry, oxygen isotope, and geochronology information about the five previously mentioned bodies. Physical volcanology encountered during this study indicates the sampled Jarbidge Rhyolite are effusive lava flows and domes that coalesced over the life of the volcanic system. First order approximations indicate that erupted products cover ~1,289 km2 and erupted material totals ~509 km3. Petrography indicates primary anhydrous mineral assemblages, assimilation of granitoid, possible assimilation of metamorphic rock and magma mixing of mafic and silicic bodies. Collectively, the Jarbidge Rhyolite lava flows sampled are compositionally restricted from rhyolite to high silica rhyolite and all samples demonstrate A-type magma characteristics. Compositions from different bodies overlap on Harker diagrams, and trace element ratios distinguish few flows from the other samples. Rare earth element patterns mimic one another, and incompatible trace element ratios overlap between bodies, likely indicating the presence of one large magma body. Oxygen isotope values for selected samples range 6.61-8.95%oVSMOW are coincident with normal igneous values. New 40Ar/39Ar geochronology indicates Jarbidge Rhyolite volcanism initiated ca. 16.7 Ma near Wild Horse Reservoir and was active at Bear Creek Summit ca.15.8 Ma. Local Steens Basalt, geochemistry, and Au-Ag mineralization indicate Jarbidge Rhyolite is similar to Middle Miocene silicic volcanics (e.g. Santa Rosa-Calico volcanic field) further west in the Oregon-Idaho-Nevada tristate region.
Bowers, Gregory Arland. "Chemical Applications in Techniques of Emerging Significance: Nanoparticle Transformation in Mitochondria and Relative Tautomer Populations in Cellular Automata." Wright State University / OhioLINK, 2017. http://rave.ohiolink.edu/etdc/view?acc_num=wright1516085869626903.
Повний текст джерелаJones, Russell Guy Ashley. "Two North American arthropods of clinical significance : their venoms and the development of specific antivenoms." Thesis, Queen Mary, University of London, 2001. http://qmro.qmul.ac.uk/xmlui/handle/123456789/26248.
Повний текст джерелаMatsuo, Koji. "Significance of dopamine D1 receptor signalling for steroidogenic differentiation of human induced pluripotent stem cells." Kyoto University, 2018. http://hdl.handle.net/2433/232124.
Повний текст джерелаBailey, Andrew Douglas. "An assessment of oxygen availability, iron build-up and the relative significance of free and attached bacteria, as factors affecting bio-oxidation of refractory gold-bearing sulphides at high solids concentrations." Doctoral thesis, University of Cape Town, 1994. http://hdl.handle.net/11427/21417.
Повний текст джерелаBacterial oxidation is currently finding significant application for the oxidative pretreatment of refractory gold-bearing sulphides. Plants processing sulphide concentrates have commonly been operated at solids concentrations of between 18 and 20 per cent (m/v) (Le 180 and 200 kg.m-3). At higher concentrations, a decline in the bio-oxidation rate has been observed. Other metallurgical processes, such as chemical leaching and cyanidation, are performed at higher solids concentrations of between 40 and 50 per cent (400 and 500 kg.m-3), providing an incentive to increase the solids concentration at which bio-oxidation plants are operated. A review of literature indicated the following factors to be potential causes of reduced bio-oxidation rates at high solids concentrations: oxygen and carbon dioxide mass transfer; a low bacteria-to-solids ratio; mechanical damage of the bacte.ria; and the build-up of inhibitory oxidation products. Interaction of these factors in the completely-mixed reactors that are commonly used for biooxidation, has confounded the interpretation of the effects of individual factors. Analysis of literature data revealed a link between the sulphide grade of a particular material and the highest solids concentration at which the bacterial oxidation rate was maximal. The oxygen demand is directly proportional to the sulphide concentration in the reactor. Correlations were used to predict the oxygen transfer potential in the experimental reactors and it was found that as long as the oxygen transfer potential exceeded the oxygen demand, the biooxidation rate was proportional to the solids concentration for a specific material. Wh~n the oxygen demand equalled or exceeded the oxygen transfer potential, then the bacterial oxidation rate was limited by oxygen availability. The sulphide grade is characteristic of a particular ore or concentrate and from the data analysis oxygen availabiiity appeared to be the underlying reason why low grade materials could be oxidised at the maximum specific bio-oxidation rate at far higher solids concentrations than high-grade f!laterials. Abstract ii The experiments performed in this study were designed to further investigate the apparent relationship, identified by analysis of literature data, between sulphide grade and the solids concentration at which the bacterial oxidation rate was maximal. The effect of both solids concentration and sulphide grade on the biooxidation rate was investigated and related to the oxygen availability in the reactor.
Gustavsson, Maria. "The Significance of Liquor-to-Wood Ratio on the Reaction Kinetics of Spruce Sulphate Pulping." Thesis, Karlstad University, Faculty of Technology and Science, 2007. http://urn.kb.se/resolve?urn=urn:nbn:se:kau:diva-805.
Повний текст джерелаIn 1957 Vroom presented an article that dealt with the kinetics of the sulphate cook. He showed that the lignin dissolution exhibited a temperature/time dependency that could be explained by the Arrhenius equation and that the reaction was of first order with respect to lignin. However, even before Vroom introduced the H-factor all wood components were assumed to react according to a first order reaction. In recent years progresses in this area have been made. Lignin for example is nowadays considered to dissolve during three parallel first order reactions, all with differences in activation energies.
When the kinetics are evaluated, several cooking series at different temperatures and concentrations of active cooking chemicals are needed. The data points obtained are then fitted into some equation. If the concentration of the active cooking chemicals is constant, the activation energies and the chemical dependency for the dissolution of wood components can easily be found. In order to simplify the evaluations of the kinetics, very high liquor-to-wood ratios are sometimes used, often as high as 50:1 or even 75:1. In this manner, the chemical concentrations are almost constant during the cook. The problem is that in the normal industrial cook where the liquor-to-wood ratio is about 4:1, the chemical concentration is not constant. This is due mostly to the alkali consumption that takes place in the cook for example when neutralising the acidic groups in the hemicelluloses.
A disadvantage with high liquor-to-wood ratios is the high dilution of the dissolved organic matter. A high concentration of dissolved lignin boosts the dissolution of the remaining lignin in the wood residue and xylan can redeposit on the fibres when its concentration in the cooking liquor is high.
The aim of this project was to describe how different liquor-to-wood ratios influence the kinetics during sulphate cooking of spruce.
Mabbott, Samuel. "Optimisation of solid-state and solution-based SERS systems for use in the detection of analytes of chemical and biological significance." Thesis, University of Manchester, 2013. https://www.research.manchester.ac.uk/portal/en/theses/optimisation-of-solidstate-and-solutionbased-sers-systems-for-use-in-the-detection-of-analytes-of-chemical-and-biological-significance(de70094c-8da0-4326-bfb2-6adf00b86af9).html.
Повний текст джерелаWestley, Chantel Barbara, and chantel westley@flinders edu au. "The distribution, biosynthetic origin and functional significance of Tyrian purple precursors in the Australian muricid Dicathais orbita (Neogastropoda: Muricidae)." Flinders University. Biological Sciences, 2008. http://catalogue.flinders.edu.au./local/adt/public/adt-SFU20090414.153942.
Повний текст джерелаOgle, Britta M. "Wild vegetables and micronutrient nutrition : Studies on the significance of wild vegetables in women's diets in Vietnam." Doctoral thesis, Uppsala : Acta Universitatis Upsaliensis : Univ.-bibl. [distributör], 2001. http://publications.uu.se/theses/91-554-5068-7/.
Повний текст джерелаCaetano, Leonardo Ribeiro. "Construção do conhecimento químico por estudantes da EJA na perspectiva da situação de estudo." Universidade Federal do Pampa, 2016. http://dspace.unipampa.edu.br:8080/xmlui/handle/riu/1140.
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O presente trabalho apresenta a elaboração, a aplicação e a análise de uma proposta pedagógica chamada Situação de Estudo como forma de construção do conhecimento químico na Educação de Jovens e Adultos do Instituto Estadual Padre Francisco Garcia da cidade de São Borja-RS. Esta proposta teve a intencionalidade de trazer a realidade dos estudantes para sala de aula, onde estes sujeitos possam pensar em situações reais de suas vivências, e no ambiente escolar construir o pensamento científico. O trabalho constitui-se de três principais momentos, os quais são, levantamento de temáticas relevantes fundamentalmente por meio de questionário com base em ideias freirianas. O segundo momento constitui na construção da proposta com os temas relevantes identificados a partir do estudo realizado no primeiro momento, ideias baseadas em princípios vygotskyanos, que nos revela a importância do meio cultural onde os sujeitos estão inseridos para o desenvolvimento da aprendizagem. O terceiro momento foi o desenvolvimento da proposta em sala de aula e análise qualitativa, com o objetivo de sinalizar possibilidades de produção de material para a Educação de Jovens e Adultos; bem como aprendizagens possibilitadas pela sua implementação em sala de aula. A construção do conhecimento químico através de uma perspectiva temática da Situação de Estudo, mostrou-se uma importante ferramenta de mediação e significação cultural e conceitual.
This paper presents the design, implementation and analysis of a pedagogical proposal called Study Situation as a Way of Construction of Chemical Knowledge in the Youth and Adult Education of Instituto Estadual Padre Francisco Garcia from São Borja - RS. This proposal had the intention to bring the reality of the students to the classroom, where these guys can think of real situations of their experiences, and in the school environment build scientific thinking. The work consists of three main moments, which are relevant thematic survey primarily through a questionnaire based on Freirian ideas. The second moment is the construction of the proposal with the relevant issues identified from the study at first, ideas based on Vygotskian principles, which reveals the importance of the cultural environment in which the subjects are included for the development of learning. The third time was the development of the proposal in class and qualitative analysis room, in order to highlight material production possibilities for Youth and Adult Education; and learning made possible by its implementation in the classroom. The construction of chemical knowledge through a Thematic Perspective Study situation proved to be an important tool mediation, and cultural and conceptual meaning.
Brookes, C. M. "Characterisation of some industrially significant chemicals by chromatographic-mass spectrometric methods." Thesis, Swansea University, 2000. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.636157.
Повний текст джерелаNorthcott, Grant Lawrence. "A study of the significance of partitioning, extractability and formation of PAH residues in sewage sludge-amended soil." Thesis, Lancaster University, 2000. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.369494.
Повний текст джерелаMorisawa, Yusuke. "Spectroscopic study of some chemically significant molecules in molecular clouds." 京都大学 (Kyoto University), 2005. http://hdl.handle.net/2433/144599.
Повний текст джерелаHammond, Georgina. "Using supercritical carbon dioxide as a tool for preserving culturally significant items." Thesis, University of Birmingham, 2017. http://etheses.bham.ac.uk//id/eprint/7464/.
Повний текст джерелаTorres, Alexandre Lourenço. "Integrando música e química: uma proposta pedagógica alternativa de aprendizagem significativa." Niterói, 2017. https://app.uff.br/riuff/handle/1/4771.
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Este trabalho relata uma metodologia ativa para o Ensino de Ligações Químicas: Composição de paródias musicais como uma proposta de potencializar a aprendizagem significativa. Trata-se de uma pesquisa de natureza qualitativa, do tipo pesquisa-ação, e utilizou, para o levantamento de dados e para a tomada de decisões no decorrer do processo de pesquisa, questionários, observações da atividade orientada, depoimento dos educandos durante e após a elaboração das paródias musicais, fotos, vídeos e análise das letras das paródias. A pesquisa foi realizada no Colégio Pedro II, Campus Niterói, Rio de Janeiro e aplicada no 1º. ano do Ensino Médio Regular do ano letivo de 2016. Os resultados obtidos indicam que a construção de paródias musicais favoreceu o processo de ensino-aprendizagem, sendo esse recurso didáticos visto pelos alunos como alternativa para facilitar a aprendizagem. Consideramos que este trabalho pode ser replicado, abrindo possibilidades de novas criações e pesquisas sobre o emprego de estratégias de metodologias ativas no ensino de Ciências da Natureza. Com o intuito de incentivar esta aplicação, elaboramos, como produto dessa dissertação, uma videoaula onde é mostrada a aplicação da metodologia e com orientações sobre a forma de utilização.
This paper reports an active methodology for the Teaching of Chemical Bonds: Composition of musical parodies as a proposal to potentiate meaningful learning. For this purpose we used a qualitative methodology and, for data collection and decision making during the research process, questionnaires, observations of the activity oriented, testimony of the students during and after the elaboration of the musical parodies, photos, videos and analysis of the letters of the parodies. The research was carried out at Pedro II School, Niterói, Campus, Rio de Janeiro and applied in the 1st. Year of Regular High School during the academic year of 2106. The results indicate that the construction of musical parodies favors facilitate the teaching-learning process. We consider that this work can be replicated and open possibilities of new creations and research on the use of active methodologies for teaching of Natural Sciences. In order to stimulate this application, we elaborate, as a product of this dissertation, a videoconference showing the application of the methodology and guidelines on how to use it.
"Flame Retardant Chemical Contamination of Seafood, Ecologically Sustainable Fisheries, and Significance for Biodiversity Conservation." Master's thesis, 2015. http://hdl.handle.net/2286/R.I.29958.
Повний текст джерелаDissertation/Thesis
Masters Thesis Biology 2015
Guerin, Turlough Fintan. "Relative significance of biodegradation and physico-chemical dissipation of endosulfan from water and soil." Thesis, 1993. http://hdl.handle.net/2123/1597.
Повний текст джерелаBrink, Andreas. "The biological significance of chemically-induced DNA adducts in relation to background DNA damage." Doctoral thesis, 2007. https://nbn-resolving.org/urn:nbn:de:bvb:20-opus-23850.
Повний текст джерелаHung, Yu-chiao, and 洪于喬. "Chemical compositions and Sr-Nd-Hf isotopes of Lutao volcanic rocks: significances on magmatic processes and source characteristics." Thesis, 2009. http://ndltd.ncl.edu.tw/handle/73428800862637361175.
Повний текст джерела國立成功大學
地球科學系碩博士班
97
The chemical components involved in the mantle source of the North Luzon lavas have been an issue of debate. In existing mixing models, the depleted end-member was assigned to MORB source, while EMI, subducting sediments, and metasomatic fluids and melts were considered as enriched components. These models were all developed from chemical and isotope compositions of lavas from entire North Luzon arc without a detailed investigation on chemical variations of lavas in individual islands. In this study, the chemical compositions and Sr, Nd, and Hf isotope ratios of Lutao volcanic rocks are used to address the process and source controls on lavas chemistry. Twenty-eight volcanic rock samples were collected from Lutao. Based on their SiO2 and total alkali contents, these samples were classified into basalt (B), basaltic andesite (BA), andesite (A) and dacite. Basalts and andesites were subdivided into isotopically enriched groups (BE and AE, respectively) and depleted groups (BD and AD, respectively). The andesite (group A) samples have similar Sr, Nd, and Hf isotope ratios with inverse correlations between MgO and incompatible element contents, reflecting fractional crystallization after partial melting from a common source. Based on trace element variations, the group A samples are modeled to be residual melts after intensive fractional crystallization. The two group AE samples have enriched 87Sr/86Sr, 143Nd/144Nd, and 176Hf/177Hf ratios, but their abundance ratios of incompatible elements resemble those of the group A samples. A plausible explanation is that the mantle sources of the groups A and AE lavas were metasomatized by same materials; however, the metasomatic process occurred earlier in the source of AE lavas, leading to enriched 87Sr/86Sr, 143Nd/144Nd, and 176Hf/177Hf ratios. The group AD samples plot closer to MORB in the 87Sr/86Sr-143Nd/144Nd- 176Hf/177Hf space. Their Nb/La and Ti/HREE ratios are lower than MORB values implying subjection to metasomatism, an inference consistent with their Sr, Nd, and Hf isotope data. 87Sr/86Sr, 143Nd/144Nd, and 176Hf/177Hf ratios of the group BE samples are similar to those of the group AE samples. However, model calculations show that their incompatible element abundances can not be explained by derivation from a common source by different degrees of partial melting. An incompatible element enriched source is required for the group AE lavas. The groups BD and AD samples have similar 143Nd/144Nd and 176Hf/177Hf ratios, but group BD has higher Sm/Nd and Lu/Hf ratios. These results imply that the source of the group BD samples was metasomatized later than that of the group AD samples. Overall, the composition and isotope data require that the mantle sources of Lutao lavas were subjected to various metasomatic agents at different time. Based on the mixing models of Kuo (2007), the 87Sr/86Sr, 143Nd/144Nd, and 176Hf/177Hf ratios of the Lutao samples are best explained by mixing sub-equal amounts of siliceous melts derived from subducted sediments and oceanic crust.
Brink, Andreas [Verfasser]. "The biological significance of chemically-induced DNA adducts in relation to background DNA damage / vorgelegt von Andreas Brink." 2007. http://d-nb.info/98576905X/34.
Повний текст джерела