Дисертації з теми "Chemical Transformation"
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Singha, Rabindranath. "Chemical transformation of carbocyclic compounds and development of novel reaction protocols." Thesis, University of North Bengal, 2021. http://ir.nbu.ac.in/handle/123456789/4348.
Повний текст джерелаAmass, Dorothy Gwendoline. "Block co-polymerization by transformation reactions." Thesis, Aston University, 1996. http://publications.aston.ac.uk/9679/.
Повний текст джерелаToke, S. M. "Synthetic studies in agrochemicals and chemical transformation of terpenes." Thesis(Ph.D.), CSIR-National Chemical Laboratory, Pune, 1989. http://dspace.ncl.res.in:8080/xmlui/handle/20.500.12252/3320.
Повний текст джерелаVasconcelos, SebastiÃo Junior Teixeira. "Catalysts from hydrotalcite dopped with copper in chemical transformation of glycerol." Universidade Federal do CearÃ, 2014. http://www.teses.ufc.br/tde_busca/arquivo.php?codArquivo=14604.
Повний текст джерелаThe hydrotalcites are a class of layered double hydroxides with important physical and chemical properties. The use of this class of compounds in catalysis of specific reactions also requires many studies. The literature has exploited these materials in catalytic reactions in liquid phase with glycerol, particularly in hydrogenolysis reactions. The gas phase reactions with glycerol usually make use of acid catalysts. Thus, both the liquid phase reactions involving catalysts derived from hydrotalcite-like gas phase reactions involving basic catalysts require further study. We developed a study to elucidating the combined effects of basic catalytic sites (MgO and amorphous aluminum oxide) and dehydrogenation (derived from copper oxides) in the hydrogenolysis reaction. The materials used were derived from hydrotalcite oxides, and oxides derivatives containing in its composition 2.5% copper (molar ratio) in relation to the metal network hydrotalcite (Mg and Al). The results obtained for the gas phase show an interrelationship between the sites and the major products of the reaction, acetol and acrolein. Was determined conditions under which one or another product is more favored, with conversions that can reach over 90% and selectivities that exceed 99%. In the liquid phase this interrelationship is more difficult to be demonstrated, given the complications arising from the greater contact time between catalyst and reactants to the point of the major products at the reaction gas phase includes both as reaction intermediates in the liquid phase. In the liquid phase, the predominant carbon chain compounds of higher alcohol and ester functional groups, cyclic compounds but also from various functional groups.
As hidrotalcitas sÃo uma classe de hidrÃxidos duplos lamelares com importantes propriedades fÃsico-quÃmicas. O emprego desta classe de compostos na catÃlise de reaÃÃes especÃficas requer, ainda, muitos estudos. A literatura tem explorado estes materiais na catÃlise das reaÃÃes com glicerol em fase lÃquida, principalmente, em reaÃÃes de hidrogenÃlise. As reaÃÃes em fase gasosa com glicerol normalmente fazem uso de catalisadores Ãcidos, de modo. Deste modo, tanto as reaÃÃes em fase lÃquida envolvendo catalisadores derivados da hidrotalcita como reaÃÃes em fase gasosa envolvendo catalisadores bÃsicos requerem maiores estudos. Desenvolveu-se um estudo com vistas a elucidaÃÃo dos efeitos combinados de sÃtios catalÃticos bÃsicos (MgO e Ãxidos de alumÃnio amorfo) e desidrogenante (Ãxidos derivados do cobre) na reaÃÃo de hidrogenÃlise. Os materiais empregados foram Ãxidos derivados da hidrotalcita, e Ãxidos derivados contendo em sua composiÃÃo 2,5% cobre (proporÃÃo molar) em relaÃÃo aos metais da rede hidrotalcita (Mg e Al). Os resultados obtidos para a fase gasosa evidenciam uma inter-relaÃÃo entre os sÃtios e os produtos majoritÃrios da reaÃÃo, acetol e acroleina. Determinou-se condiÃÃes em que um ou outro produto à mais favorecido, com conversÃes que podem chegar a mais de 90% e seletividades que superam 99%. Em fase lÃquida esta inter-relaÃÃo à mais difÃcil de ser evidenciada, dadas as complicaÃÃes originadas pelo maior tempo de contato entre catalisador e reagentes a tal ponto dos produtos majoritÃrios verificados na reaÃÃo fase gasosa figurarem como intermediÃrios da reaÃÃo em fase lÃquida. Na fase lÃquida, predominam compostos de maior cadeia carbÃnica dos grupos funcionais Ãlcool e Ãster, mas tambÃm compostos cÃclicos de grupos funcionais diversos.
Lucius, Ruth A. "Assessing Corn Quality And Transformation During Nixtamalization: A Physico-Chemical Approach." The Ohio State University, 2009. http://rave.ohiolink.edu/etdc/view?acc_num=osu1231442056.
Повний текст джерелаLucius, Ruth A. "Assessing corn quality and transformation during nixtamalization a physico-chemical approach /." Columbus, Ohio : Ohio State University, 2008. http://rave.ohiolink.edu/etdc/view?acc%5Fnum=osu1231442056.
Повний текст джерелаSingha, Rabindranath. "Chemical transformation of carbocyclic compounds and development of novel reaction protocols." Thesis, University of North Bengal, 2021. http://ir.nbu.ac.in/handle/123456789/4326.
Повний текст джерелаChakraborty, Prasanta. "Chemical transformation of carbocyclic compounds and screening for their biological activity." Thesis, University of North Bengal, 2011. http://hdl.handle.net/123456789/1387.
Повний текст джерелаReddy, T. I. "Synthesis and reactivity of push-pull ethylene systems; new zeolite catalyzed chemical transformations." Thesis(Ph.D.), CSIR-National Chemical Laboratory, Pune, 1992. http://dspace.ncl.res.in:8080/xmlui/handle/20.500.12252/3913.
Повний текст джерелаMassam, Alexandra. "A kinetic model for the transformation of phenol by peroxidase." Thesis, National Library of Canada = Bibliothèque nationale du Canada, 1999. http://www.collectionscanada.ca/obj/s4/f2/dsk1/tape8/PQDD_0008/MQ50641.pdf.
Повний текст джерелаStark, I. "An atom-probe study of the chemical redistribution accompanying phase tranformations in steels." Thesis, University of Oxford, 1988. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.253284.
Повний текст джерелаReddy, K. V. "A) Nitrothioacetamides: synthesis and chemical transformations; B) Study of some weak interactions of the thiocarbonyl group." Thesis(Ph.D.), CSIR-National Chemical Laboratory, Pune, 1992. http://dspace.ncl.res.in:8080/xmlui/handle/20.500.12252/3912.
Повний текст джерелаKang, Shin-Gyoo. "Fundamental studies of mineral matter transformation during pulverized coal combustion : residual ash formation." Thesis, Massachusetts Institute of Technology, 1991. http://hdl.handle.net/1721.1/13746.
Повний текст джерелаSinger, Jared Wesley. "Formation and Transformation of Amorphous Calcium-Magnesium Carbonates in Synthetic Seawater." Thesis, Alfred University, 2018. http://pqdtopen.proquest.com/#viewpdf?dispub=10184519.
Повний текст джерелаThe aqueous chemistry, precipitation, and crystallization of metal-carbonates comprises a vast field of research that underlies the urgency of CO2 sequestration, ocean-acidification, and biomineralization. The results of recent experimental and computational studies suggest that amorphous calcium and magnesium carbonates are precipitated from supersaturated aqueous conditions by non-classical aggregation of ion pairs, dimers, dynamically-ordered-liquid-likeoxypolymers (DOLLOPS), and prenucleation clusters (PNCs). We present the first high field (20 T) 43Ca and 25Mg NMR studies of amorphous calcium-magnesium carbonates (ACC, ACMC, AMC) materials. Direct integration of computational techniques with experimental NMR provides a novel step forward toward multi-scale integration of computational and experimental techniques. Supporting information is derived from X-ray diffraction (XRD), thermogravimetric/differential thermal analysis (TGA-DTA), and scanning electron microscopy—energy dispersive spectroscopy (SEM-EDS) and provides important comparison to the bulk structures and composition.
High field NMR of amorphous carbonates demonstrates that amorphous carbonates contain various types of local disorder, but does not corroborate the theory of polyamorphism nor nano scale phase separations postulated by other workers. Carbon (13C) NMR of 13Cenriched materials indicates a degree of Ca-Mg solid solution in ACMCs, as ACMC 13C resonances cannot be adequately reconstructed from the pure ACC and AMC 13C resonances. However, with increasing Mg-content (and therefore H2O content) 13C NMR resonances are strongly influenced by water-carbonate hydrogen bonding, shifting to lower resonance frequency and broadening. The 13C-NMR are well-fit with single Gaussian distributions, suggesting that two-phase models of ACMCs are not required to explain our 13C NMR observations. Protoncarbon cross polarization indicates that there is a H population proximal to carbonate groups for all amorphous phases. 43Ca NMR yields line shapes that span the resonance frequency range of all known crystalline calcium carbonate polymorphs and is well fit with a single Gaussian distributions. 43Ca NMR does not support a theory of polyamorphisms, but rather suggests an unstructured, continuous distribution of local environments that is unlike any specific crystalline phase. The mean 43Ca chemical shifts vary 0.77 ppm from compositions x = 0 to 0.5 [x = Mg/(Mg + Ca)], demonstrating that Mg2+ has very little influence on the molecular-scale 43Ca environment in ACMCs. Through integration of quantum mechanical calculations, classical MD, and NMR we ascertain a maximum mean Ca-O bond distance in our ACCs/ACMCs of 2.45 ± 1 Å that is independent of composition. Unlike the indistinguishable local calcium environments, 25Mg NMR of amorphous material gives evidence for several distinct overlapping quadrupolar line shapes. These sites do not generate NMR resonances that are perfect matches for known crystalline polymorphs of magnesian carbonates and extend toward lower resonance frequencies far beyond the range of known equilibrium analogs. By comparison to the range of reference phases, the low frequency singularities of ACMC-AMC resonances are consistent with some population of Mg-O bond distances greater than 2.10 Å and/or some fraction of sites with high coordination numbers (up to 8). The local Mg environment of a protodolomite crystallization [x = Mg/(Mg + Ca) = 0.6] exhibits 25Mg NMR parameters most similar to the asymmetric Mg2+ coordination environment of lansfordite [Mg(CO3)2(H2O)4]2– or huntite. Although H-C cross polarization indicates no H-bonding with carbonate the XRD gives not longrange indications of huntite. The large effective radius of strongly hydrated Mg in the protodolomite likely provides a driving force for cation ordering in dolomite.
De, Luca Gino. "Theory and simulation of microstructure transformation in cholesteric liquid crystalline materials : applications to biological fibrous composites." Thesis, McGill University, 2002. http://digitool.Library.McGill.CA:80/R/?func=dbin-jump-full&object_id=79225.
Повний текст джерелаGao, Wenyang. "Metal-Organic Frameworks as Potential Platforms for Carbon Dioxide Capture and Chemical Transformation." Scholar Commons, 2016. http://scholarcommons.usf.edu/etd/6503.
Повний текст джерелаVilla, Adam Daniel. "Lean transformation methodology and implementation in biopharmaceutical operations." Thesis, Massachusetts Institute of Technology, 2008. http://hdl.handle.net/1721.1/44322.
Повний текст джерелаIncludes bibliographical references (p. 77-78).
Amgen's Operations division is responsible for the production, release and distribution of commercial and clinical products. Due to industry consolidation, impending competition and revenue impacts, Amgen is facing the need to rapidly improve the Operations division and align different manufacturing sites. In order to achieve these goals, the Operations Improvement group is leading an initiative to bring about a lean transformation of Amgen's operations.This thesis analyzes the initial operational excellence efforts underway within Amgen Operations. The analysis includes an overview of the process by which the continuous improvement methodology and strategy were constructed, the creation of a training curriculum and the initial implementation of the continuous improvement methodology at specific manufacturing sites. In addition, the thesis explores the environment in which this program operates and the cultural and business drivers that support and detract from the efforts.The following conclusions were developed as a result of the analysis of the lean transformation efforts at Amgen. First, company and industry specific nomenclature is essential to make lean principles contextually relevant for the biopharmaceutical industry. Additionally, relevant metrics are needed to facilitate multi-site alignment and drive the desired behavior. Finally, continuous improvement efforts can effectively leverage a science-based culture by applying it to a new business context.
by Adam Daniel Villa.
S.M.
M.B.A.
Röger, Hans Peter. "Application of the transformation of 1,2,4-Trimethylbenzene to monitor the chemical vapour deposition of Tetraethoxysilane over ZSM-5." Doctoral thesis, University of Cape Town, 1998. http://hdl.handle.net/11427/19813.
Повний текст джерелаKasap, Hatice. "Carbon nitride for solar H2 production coupled to organic chemical transformations." Thesis, University of Cambridge, 2019. https://www.repository.cam.ac.uk/handle/1810/289454.
Повний текст джерелаKumar, Priyank Vijaya. "Enhanced electrical, optical and chemical properties of graphene oxide through a novel phase transformation." Thesis, Massachusetts Institute of Technology, 2015. http://hdl.handle.net/1721.1/98736.
Повний текст джерелаCataloged from PDF version of thesis.
Includes bibliographical references (pages 86-98).
Graphene oxide (GO) is a versatile, solution-processable candidate material for next-generation, large-area, ultrathin electronics, optoelectronics, energy conversion and storage technologies. GO is an atom-thick sheet of carbon functionalized with several oxygen-containing groups dominated by the epoxy and hydroxyl functional groups on the basal plane, with carboxyls and lactols at the sheet edges. It is well known that reduction of GO at temperatures > 150°C leads to the removal of oxygen atoms from the carbon plane, leading to the formation of reduced GO (rGO) structures. Although GO has been utilized for multiple applications in the last decade, our understanding of the structure-property relationships at the atomic-level has still been lacking owing to the amorphous nature and chemical inhomogeneity of GO, which has in turn limited our ability to design and tailor GO nanostructures for high-performance applications. In particular, the material's structure and its structural evolution at mild annealing temperatures (< 1000°C) has been largely unexplored. In this thesis, we use a combination of first-principles computations, classical molecular dynamics simulations based on reactive force fields and experiments to model realistic GO structures and develop a detailed understanding of the relationship between the carbon-oxygen framework and the sheet properties, at the atomic level. Based on our understanding, we demonstrate a new phase transformation in GO sheets at mild annealing temperatures (50-80°C), where the oxygen content is preserved and as-synthesized GO structures undergo a phase separation into prominent oxidized and graphitic domains facilitated by oxygen diffusion. Consequently, as-synthesized GO that absorbs mainly in the ultraviolet region becomes strongly absorbing in the visible region, photoluminescence is blue shifted and electronic conductivity increases by up to four orders of magnitude. We then use this novel phase transformation to improve two sets of applications. 1) We demonstrate that cell capture devices making use of phase transformed-GO substrates have higher capture efficiencies compared to devices making use of as-synthesized GO substrates. 2) We show that the reduction of phase transformed-GO leads to better electrical properties of rGO thin films. Our results fill an important gap and establish a complete theory for structural evolution of GO over the entire range of temperatures, i.e. from room temperature to ~1000°C. Taken together, this structural transition in GO enables us to predict and control the sheet properties in new ways, as opposed to reduction, which is till date the only handle to control the structure of GO. This could potentially open the door for completely new applications or for enhancing the performance of existing applications based on GO.
by Priyank Vijaya Kumar.
Ph. D.
Chinalia, Fabio Alexandre. "Biological and chemical monitoring of the transformation of recalcitrant organic compounds in river sediment." Thesis, University of Aberdeen, 2002. http://digitool.abdn.ac.uk/R?func=search-advanced-go&find_code1=WSN&request1=AAIU153937.
Повний текст джерелаJayarathne, Ayomi L. "Transformation of physical and chemical properties of metals built-up on urban road surfaces." Thesis, Queensland University of Technology, 2018. https://eprints.qut.edu.au/122560/1/Ayomi_Jayarathne_Thesis.pdf.
Повний текст джерелаGaramendi-Colos, Virginia, Mercedes Cano-Lazarte, Nestor Mamani-Macedo, Carlos Raymundo, and Francisco Dominguez. "Agile Inventory Management Model Under a Digital Transformation Approach for Stockout Reduction in Chemical Industry’s MSE." Springer, 2020. http://hdl.handle.net/10757/656371.
Повний текст джерелаThrough digital transformation, company processes that are, or could be, conducted manually are reduced; moreover, human tasks are automated when software-based processes are established. This paper analyzes the adoption of a digital transformation tool to manage inventory through the application of agile models, such as Just-In-Time, and the use of Enterprise Resource Planning (ERP), employing the Deming cycle method, as several unclear empiric processes exist for managing inventory and purchases. It also upholds that as defined processes are established and the companies exert higher control over inventory turnover and outflows, they could apply methods, such as demand forecasting, to avoid stockout, supply shortage, and inventory loss.
Gonzalez, Richard. "Biocatalytic transformation of steroids using solvent-enhanced Beauveria bassiana." Diss., University of Iowa, 2015. https://ir.uiowa.edu/etd/1610.
Повний текст джерелаSavage, Nicholas Henry. "Studies of the chemical transformation of atmospheric nitrogen and sulphur compounds by comparing data with models." Thesis, University of East Anglia, 1999. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.302208.
Повний текст джерелаDzyazko, Yu S., E. V. Mokrousova, Yu M. Volfkovich, V. E. Sosenkin, and N. F. Nikolskaya. "Labile collagen matrix: transformation of hierarchical structure at nano- and micro-levels influenced by chemical treatment." Thesis, Видавництво СумДУ, 2011. http://essuir.sumdu.edu.ua/handle/123456789/20527.
Повний текст джерелаBusireddy, Bhargavi. "Study of Mercury Transformation with Chlorinated Species under Homogeneous and Heterogeneous Conditions." University of Dayton / OhioLINK, 2009. http://rave.ohiolink.edu/etdc/view?acc_num=dayton1299087195.
Повний текст джерелаShiraiwa, Manabu [Verfasser]. "Kinetic modeling and experiments on gas uptake and chemical transformation of organic aerosol in the atmosphere / Manabu Shiraiwa." Mainz : Universitätsbibliothek Mainz, 2011. http://d-nb.info/1025263596/34.
Повний текст джерелаALMEIDA, CIBELE MARIA STIVANIN DE. "STUDIES ON THE ORIGIN AND TRANSFORMATION OF SELENIUM AND ITS CHEMICAL SPECIES ALONG THE PROCESS OF PETROLEUM REFINING." PONTIFÍCIA UNIVERSIDADE CATÓLICA DO RIO DE JANEIRO, 2008. http://www.maxwell.vrac.puc-rio.br/Busca_etds.php?strSecao=resultado&nrSeq=12188@1.
Повний текст джерелаCONSELHO NACIONAL DE DESENVOLVIMENTO CIENTÍFICO E TECNOLÓGICO
Diferentes métodos espectrométricos de análise, incluindo ICP OES, ICP-DRCMS e Q-ICPMS com técnicas hifenadas (geração de hidreto, vaporização eletrotérmica ou cromatografia de íons), foram aplicados na caracterização química de 16 óleos e 41 amostras de efluentes aquosos de uma refinaria de petróleo. O objetivo específico deste estudo foi o de entender o comportamento do selênio (Se) e de suas espécies químicas ao longo do processo de geração e tratamento dos efluentes desta unidade industrial. A caracterização química multielementar das amostras por ICP-MS revelou uma composição muito complexa da maioria deles, com altas salinidades e potenciais interferentes espectrais e não espectrais presentes. Por isso, foi necessária uma reavaliação crítica das técnicas analíticas para a determinação de Se e de suas espécies. As técnicas de ICP-DRC-MS, utilizando CH4 como gás de reação, e de ETVICPMS mostraram o seus potencial para a determinação de Se com melhores limites de detecção (cerca de 0,05 ug L-1 para ambas), mas também as suas limitações na análise de efluentes com altas salinidades. Nas 16 amostras de petróleo analisadas, verificou-se uma grande variabilidade nas concentrações de Se total, cobrindo uma faixa de < 10 ug kg-1 até 960 ug kg- 1, a qual poderia explicar também a carga muito variável deste elemento nos efluentes das diferentes unidades de tratamento. As maiores concentrações de Se total foram encontradas nas águas ácidas, com concentrações de até 1714 ug L-1. Confirmou-se a predominância de SeCN - na maioria das amostras analisadas, mas observaram-se também outras espécies com tempos de retenção diferentes das espécies Se(IV), Se(VI) e SeCN-, especialmente nos efluentes da estação de tratamento de despejos industrais (E.T.D.I.). Em amostras ácidas, identificou-se Se coloidal (Seº) formado pela decomposição de SeCN-, ou de outras espécies pouco estáveis nestas condições. Experiências de bancada com soluções de SeCN- apoiaram esta hipótese. Foi constatada, que o perfil de especiação de amostras coletadas num mesmo local de processamento, mas em épocas diferentes, pode variar significativamente, o que torna difícil a comparação de dados obtidos neste trabalho com os de outros autores.
Different spectrometric methods of analysis, including ICP OES, ICP-DRC-MS and Q-ICP-MS, the latter hyphenated to hydride generation, eletrothermal vaporization or ion chromatography have been appliesd to the chemical characterization of 16 crude oils and 41 effluents samples from a petroleum refinery. The specific objective of this study was to get information on the behavior of selenium (Se) and its species along the different processes of generation and treatment of the effluents.Multielemental characterization of effluents by ICP-MS revealed a complex composition of most of them, with high salinity and potential spectral and non spectral interferents present. For this reason, a critical reassessment of the analytical techniques for the determination of total Se and its species was necessary. DRC-ICP-MS and ETV-ICPMS, using CH4 as cell reaction gas, showed their potential for the determination of Se with better detection limits (about 0,05 ug L-1), but also their limitations for the analysis of effluents with high salinity. A large variability in the concentration of Se was observed in the 16 analysed crude oil samples (< 10 ug kg-1 Se until up to 960 ug kg-1), which may explain also the varying concentrations measured in the effluents. Highest concentrations of selenium were measured in samples from the treatment unit for acid waters (up to 1.714 ug L-1). The predominance of selenocyanate (SeCN-1) was confirmed in most of the effluent samples analysed, but also several other species with retention times different from Se(IV), Se(VI) e SeCN - were observed, especially in samples from the treatment plant. Colloidal Se (Seº) was identified in acid waters, probable formed by decomposition of SeCN - or other unstable species under these conditions. Laboratory experiments with selenocyanate solutions confirmed this hypothesis. The speciation profile of samples collected at the same point, but at different time intervals, showed significant variations, not allowing easy comparison of the results obtained in this work with those of other authors.
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 джерелаPannier, Andy Joseph. "Reductive transformation of 2,4,6-Trinitrotoluene by Yarrowia lipolytica AN-L15 under conditions of different initial pH of the culture medium or in the presence of ferrihydrite." Thesis, Montana State University, 2009. http://etd.lib.montana.edu/etd/2009/pannier/PannierA0509.pdf.
Повний текст джерелаHoffman, Andrew J. 1991. "The environmental transformation of American industry : an institutional account of organizational evolution in the chemical and petroleum industries, (1960-1993)." Thesis, Massachusetts Institute of Technology, 1995. http://hdl.handle.net/1721.1/11744.
Повний текст джерелаSierra-Irizarry, Eddie A. "Processing of polypropylene by melt transformation coextrusion process, study of flow birefringence, using an internally cooled die." Ohio : Ohio University, 1987. http://www.ohiolink.edu/etd/view.cgi?ohiou1183061054.
Повний текст джерелаYan, Kai [Verfasser]. "Transformation of biogenic carbohydrates into levulinic acid and further hydrogenation using supported nanoparticle catalysts synthesized by chemical fluid deposition / Kai Yan." Aachen : Hochschulbibliothek der Rheinisch-Westfälischen Technischen Hochschule Aachen, 2011. http://d-nb.info/1018171967/34.
Повний текст джерелаHeidarian, Höckerfelt Mina. "On the chemical and processing stability of pharmaceutical solids : Solid form dependent water presenting capacity and process induced solid form transformation." Doctoral thesis, Uppsala universitet, Institutionen för farmaci, 2015. http://urn.kb.se/resolve?urn=urn:nbn:se:uu:diva-261785.
Повний текст джерелаBurtin, Pierre. "Transformation des alumines de transition en alumine alpha. Influence d'éléments étrangers sur la stabilité des alumines." Phd thesis, Ecole Nationale Supérieure des Mines de Saint-Etienne, 1985. http://tel.archives-ouvertes.fr/tel-00845793.
Повний текст джерелаUsman, Muhammad. "Formation of mixed Fe"-Fe"' oxides and their reactivity to catalyze chemical oxidation : remediation of hydrocarbon contaminated soils." Thesis, Nancy 1, 2011. http://www.theses.fr/2011NAN10093/document.
Повний текст джерелаThe main theme of this research is the use of reactive iron minerals in the remediation of hydrocarbon contaminated soils via chemical oxidation treatments at circumneutral pH. The contribution of this thesis is two-fold including the abiotic synthesis of mixed FeII-FeIII oxides considered as reactive iron minerals (magnetite and green rust) and their use to catalyze chemical oxidation. Oxidation methods tested in this study include Fenton-like (FL) and activated persulfate oxidation (AP). The formation of magnetite and green rust was studied by abiotic FeII-induced transformations of various ferric oxides like ferrihydrite, goethite, hematite and lepidocrocite. Then, the ability of magnetite was tested to catalyze chemical oxidation (FL and AP) for the degradation of aliphatic and polycyclic aromatic hydrocarbons (PAHs) at circumneutral pH. Significant degradation of oil hydrocarbons occurring in weathered as well as in crude oil was obtained by both oxidants. Magnetite catalyzed oxidation was also effective for remediation of two PAHs contaminated soils from ancient coking plant sites. No by-products were observed in all batch slurry oxidation systems. Very low hydrocarbon degradation was observed when soluble FeII was used as catalyst under the same experimental conditions. Magnetite also exhibited high reactivity to catalyze chemical oxidation in column experiments under flow through conditions. Oxidation studies revealed the importance of catalyst type for oxidation, PAHs availability in soils and the soil matrix effect. Results of this study suggest that magnetite can be used as iron source to activate both Fenton-like and persulfate oxidation at circumneutral pH. This study has important implications in the remediation of hydrocarbon polluted soils through in-situ chemical oxidation
Das, Saikat. "FUNDAMENTAL STUDIES OF SURFACTANT TEMPLATED METAL OXIDE MATERIALS SYNTHESIS AND TRANSFORMATION FOR ADSORPTION AND ENERGY APPLICATIONS." UKnowledge, 2015. http://uknowledge.uky.edu/cme_etds/48.
Повний текст джерелаMonastyrsky, G. E. "The Peculiarities of Martensite Morphology in Nano- and Inhomogeneous Spaces." Thesis, Sumy State University, 2013. http://essuir.sumdu.edu.ua/handle/123456789/35232.
Повний текст джерелаDelattre, Anastasia. "Synthèses chimiques, transformation de phase et étude des propriétés magnétiques des nanoparticules de FePt et FePd." Phd thesis, Grenoble, 2010. http://tel.archives-ouvertes.fr/tel-00570569.
Повний текст джерелаSom, Marie-Pierre. "ÉTUDE MOLÉCULAIRE DES COMPOSÉS ORGANIQUES DE COMPOSTFORMATION, TRANSFORMATION DANS LES SOLSACTION SUR LES PROPRIÉTÉS DES SOLS." Phd thesis, Université de Poitiers, 2006. http://tel.archives-ouvertes.fr/tel-00157336.
Повний текст джерелаCinq nouveaux critères de maturité ont été déterminés par thermo-gravimétrie et thermochimiolyse. Cette technique permet d'observer l'augmentation de l'activité bactérienne (rapport acides ramifiés/linéaires et mono/diacides). De plus l'oxydation de composés triterpèniques dans les lipides est mise en évidence. L'évolution de la matière organique (MO) des substances humiques (SH) ne fait pas apparaître de lien direct avec les lipides libres.
L'apport de compost sur un sol instable augmente l'activité biologique améliorant ainsi sa stabilité structurale et limitant les risques d'érosion. Des marqueurs lipidiques du compost ont été suivis après épandage. L'incorporation de la MO du compost dans les SH est démontrée par l'augmentation du rapport acides ramifiés/linéaires et la présence d'omega-méthoxyesters.
Biborski, Andrzej. "Chemical ordering kinetics and thermal vacancy thermodynamics in B2 binary intermetallics : simulation study." Praca doktorska, Strasbourg, 2010. http://www.theses.fr/2010STRA6196.
Повний текст джерелаIntermetallics based on the B2 superstructure are very promising for their physical properties. An unusual high vacancy concentration is observed in highly ordered systems. Whereas elementary atomic jumps occur via a vacancy mechanism, surprisingly the rate of chemical ordering processes is much lower for B2 – NiAl superstructure – with relatively very high vacancy concentration – in comparison to the system with low vacancy concentration (L12 - Ni3Al). That phenomenon was often explained by the means of so called „triple defect” – where vacancies are mostly „trapped” on the Ni sub-lattice and correlated with creation of Ni antisites (Ni atoms residing on the Al sub-lattice), with statistically two vacancies per one antisite. The general aim of this thesis was to elaborate a methodology for kinetic simulations by Monte-Carlo methods of structural transformations in these systems. Therefore it was necessary to develop a thermodynamic model which allows finding equilibrium vacancy concentration – as the thermal dependency of vacancy concentration cannot be neglected. Consistent Kinetic Monte-Carlo simulations could be next realized. They were made using either an Ising-type Hamiltonian or the many body potentials of the Embedded Atom Method. The results are in good agreement with the experimental observations: the slow evolution of the system is due to the statistical inefficiency of jumps performed (many return jumps) after the extremely fast stage of generation of triple defects
Wang, Xiujun. "Melt transformation coextrusion of polyethylene and polybutylene measurements of streamline flow and pressure effect on birefringence and interface visualization in the MTCE process." Ohio : Ohio University, 1989. http://www.ohiolink.edu/etd/view.cgi?ohiou1182182580.
Повний текст джерелаBurger, Emilien. "Métallurgie extractive protohistorique du cuivre :Etude thermodynamique et cinétique des réactions chimiques de transformation de minerais de cuivre sulfurés en métal et caractérisation des procédés." Phd thesis, Université Pierre et Marie Curie - Paris VI, 2008. http://tel.archives-ouvertes.fr/tel-00368257.
Повний текст джерелаGuengard, Hélène. "Transitions de phases structurales dans des elpasolites fluorées." Phd thesis, Université Sciences et Technologies - Bordeaux I, 1994. http://tel.archives-ouvertes.fr/tel-00140033.
Повний текст джерелаChambon, Flora. "Transformation de la cellulose par catalyse hétérogène." Phd thesis, Université Claude Bernard - Lyon I, 2011. http://tel.archives-ouvertes.fr/tel-00829774.
Повний текст джерелаSalvetti, Marie-Gabrielle. "De l'organique au minéral : Étude expérimentale et modélisation de la transformation d'un précurseur polysilazane en "carbonitrure de silicium"." Phd thesis, Ecole Nationale Supérieure des Mines de Saint-Etienne, 1994. http://tel.archives-ouvertes.fr/tel-00843575.
Повний текст джерелаMateos, David. "Transformation de matériaux énergétiques par oxydation hydrothermale : Etude cinétique globale et simulation du procédé en régime permanent sur des composés modèles." Phd thesis, Université Sciences et Technologies - Bordeaux I, 2003. http://tel.archives-ouvertes.fr/tel-00010254.
Повний текст джерелаCerniauskaite, Deimante. "Glucosinolates - myrosinase : synthèse de substrats naturels et artificiels, inhibiteurs et produits de transformation enzymatique." Phd thesis, Université d'Orléans, 2010. http://tel.archives-ouvertes.fr/tel-00739777.
Повний текст джерелаGomes, Christophe. "Une approche diagonale pour la transformation catalytique du dioxyde de carbone." Phd thesis, Université Paris Sud - Paris XI, 2013. http://tel.archives-ouvertes.fr/tel-00954408.
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