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Dissertations / Theses on the topic 'Oxamic acid'

Author: Grafiati

Published: 19 October 2024

Last updated: 26 July 2025

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1

Canevari, Thiago da Cruz 1980. "Ftalocianina de cobalto preparada in situ sobre o oxido misto SiO2/SnO2 obtido pelo processo sol-gel. Aplicação na oxidação eletrocatalitica do acido oxalico e do nitrito." [s.n.], 2008. http://repositorio.unicamp.br/jspui/handle/REPOSIP/249670.

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Orientador: Yoshitaka Gushikem<br>Dissertação (mestrado) - Universidade Estadual de Campinas, Instituto de Quimica<br>Made available in DSpace on 2018-08-11T20:31:08Z (GMT). No. of bitstreams: 1 Canevari_ThiagodaCruz_M.pdf: 626518 bytes, checksum: a33704384d49a883c4ca32c883b2ad0d (MD5) Previous issue date: 2008<br>Resumo: Este trabalho descreve a síntese do óxido misto SiO2/SnO2 nas composições 3%, 8,6% e 12% (% em massa de SnO2) obtido pelo processo sol-gel. As informações sobre a formação do SiO2/SnO2, foram obtidas utilizando as técnicas disponíveis para tal finalidade como área superfici

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2

Jaussaud, Quentin. "Génération in situ d’isocyanates par décarboxylation d’acides oxamiques pour l’élaboration de matériaux polyuréthanes." Electronic Thesis or Diss., Bordeaux, 2024. http://www.theses.fr/2024BORD0139.

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Ces travaux de thèse portent sur la synthèse de polyuréthanes par génération in situ d’isocyanates, à travers différentes voies de moindre toxicité que la voie classique faisant appel à l’utilisation directe d’isocyanates. Dans un premier temps, la décarboxylation oxydante des acides oxamiques conduisant à la formation d’isocyanates a été réalisée par activation thermique grâce à l’utilisation d’un iodure hypervalent, jouant le rôle d’oxydant. Une étude cinétique sur des réactions modèles en présence d’alcool, associé à une modélisation numérique, ont notamment mis en évidence un effet catalyt

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3

Lee, Sung Oh School of Chemical Engineering &amp Industrial Chemistry UNSW. "Dissolution of iron oxides by oxalic acid." Awarded by:University of New South Wales. School of Chemical Engineering & Industrial Chemistry, 2005. http://handle.unsw.edu.au/1959.4/23924.

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The iron content of industrial minerals can be reduced by physical and chemical processing. Chemical processing is very efficient to achieve a high degree of iron removal at minimum operating cost. Both inorganic acids and organic acids have been used for clay refining. However, due to environmental pollution and contamination of products with the SO42- and Cl-, inorganic acids should be avoided as much as possible. This research investigated the use of oxalic acid to dissolve iron oxides and the dissolution characteristics of natural iron oxides. The dissolution of iron oxides in oxalic acid

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4

Bottrill, Stephen. "Comparative studies of oxalyl-CoA decarboxylase produced by soil and ruminal bacteria." Title page, contents and abstract only, 1999. http://web4.library.adelaide.edu.au/theses/09ANM/09anmb751.pdf.

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Bibliography: leaves 139-167 The aim of this project was to identify an enzyme responsible for the metabolism of oxalate which would be suitable for degrading oxalate in the rumen, and clone and characterise that gene.

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5

McMullan, E. A. "The electrochemical reduction of carbon dioxide, glyoxylic acid and oxalic acid." Thesis, University of Ulster, 1985. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.356452.

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6

Tokimatsu, Toshiaki. "Biochemical Roles of Oxalic Acid in Wood Decay Model Systems and Characteristics of a New Oxalic Acid Producing Enzyme Glyoxylate Dehydrogenase." Kyoto University, 1999. http://hdl.handle.net/2433/182430.

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Kyoto University (京都大学)<br>0048<br>新制・課程博士<br>博士(農学)<br>甲第7591号<br>農博第1030号<br>新制||農||773(附属図書館)<br>学位論文||H11||N3226(農学部図書室)<br>UT51-99-D208<br>京都大学大学院農学研究科林産工学専攻<br>(主査)教授島田幹夫, 教授桒原正章, 教授中坪文明<br>学位規則第4条第1項該当

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7

Ketusky, Edward. "Remediation of spent oxalic acid nuclear decontamination solutions using ozone." Thesis, Lancaster University, 2018. http://eprints.lancs.ac.uk/123625/.

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The Savannah River Site (SRS) has forty-three remaining very large underground tanks containing significant quantities of nuclear waste generated primarily from cold-war radiochemical separations. All of the tanks eventually must be closed. As part of decommissioning/closing the nuclear waste tanks, even residual quantities of the waste must be removed. Although most sludge can be removed mechanically, chemically cleaning (i.e. decontamination) with oxalic acid is used to aid in the removal of residual quantities. Although oxalic acid works for cleaning the tanks, its downstream impacts are co

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8

Watanabe, Tomoki. "Mechanisms for oxalic acid decomposition and transport in wood-rotting fungi." Kyoto University, 2008. http://hdl.handle.net/2433/136618.

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Kyoto University (京都大学)<br>0048<br>新制・課程博士<br>博士(農学)<br>甲第13891号<br>農博第1706号<br>新制||農||955(附属図書館)<br>学位論文||H20||N4358(農学部図書室)<br>UT51-2008-C807<br>京都大学大学院農学研究科応用生命科学専攻<br>(主査)教授梅澤俊明, 教授矢﨑一史, 教授江﨑信芳<br>学位規則第4条第1項該当

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9

Lowalekar, Viral Pradeep. "Oxalic Acid Based Chemical Systems for Electrochemical Mechanical Planarization of Copper." Diss., The University of Arizona, 2006. http://hdl.handle.net/10150/193886.

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In an ECMP process, a wafer is anodically baised during polishing. The electrical potential is the driving force to oxidize copper metal to ions. Copper ions then react with chemistry in the electrolyte to go in solution or form a passivation layer on the surface. The passivation layer is removed by a very low downforce (0.5-1 psi), causing copper to electrochemically dissolve in solution. Passive film formation during copper ECMP is key to the success of this process, since passivation reduces dissolution in the recessed areas, while elevations on the copper surface in direct contact with the

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10

Beaulieu, Robert A. "Oxalic acid production by sclerotinia homoeocarpa the causal agent of dollar spot /." Connect to resource, 2008. http://hdl.handle.net/1811/32174.

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11

Missengue-Na-Moutoula, Roland. "Synthesis of ZSM-5 zeolite from South African fly ash and its application as solid catalyst." University of the Western cape, 2016. http://hdl.handle.net/11394/5431.

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Philosophiae Doctor - PhD<br>Zeolites are widely used as environmentally friendly solid catalysts or catalyst supports in the refining and petrochemical industries. ZSM-5 zeolite is composed of a three-dimensional medium pore structure (openings of 5-5.5 Å) with high silica content, high temperature stability and strong acidity making it a well-known and an established catalyst for several petroleum derived chemical processes such as cracking, aromatic alkylation, disproportionation, Methanol-to-Gasoline, isomerisation, etc. Nowadays, the synthesis of ZSM-5 zeolite from silica, alumina sources

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12

Tsai, Suh-Jen Jane. "Equilibrium and kinetic studies of metal ion promoted hydration and enolization reactions of oxaloacetate in various buffers : the cooperativity with base catalysts /." The Ohio State University, 1985. http://rave.ohiolink.edu/etdc/view?acc_num=osu1487258254024045.

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13

Tranca, Ionut [Verfasser]. "Density functional study of molecular adsorption on the Cu(011) surface : oxalic acid and 2,5 pyrazine di-carboxylic acid / Ionut Tranca." Aachen : Hochschulbibliothek der Rheinisch-Westfälischen Technischen Hochschule Aachen, 2012. http://d-nb.info/1022616684/34.

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14

Ribeiro, Emerson Schwingel. "Estudos das atividades eletrocataliticas das ftalocianinas de Co (II) e Fe (II) tetrassulfonadas suportadas sobre silica gel quimicamente modificada com ion piridinio." [s.n.], 1999. http://repositorio.unicamp.br/jspui/handle/REPOSIP/249658.

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Orientador: Yoshitaka Gushikem<br>Dissertação (mestrado) - Universidade Estadual de Campinas, Instituto de Quimica<br>Made available in DSpace on 2018-07-25T01:05:02Z (GMT). No. of bitstreams: 1 Ribeiro_EmersonSchwingel_M.pdf: 420485 bytes, checksum: 7bfe2621e82443b62fc69696c3376989 (MD5) Previous issue date: 1999<br>Mestrado

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15

Azzu, Youssef Mohamed. "Modulation of fruit ripening, storage time and quality of fruits with emulsion of Chitosan alone and loaded with Salicylic acid or Oxalic acid." Thesis, Curtin University, 2016. http://hdl.handle.net/20.500.11937/576.

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Efficacy of chitosan emulsion, salicylic acid (SA) or oxalic acid (OA) alone and chitosan loaded with SA or OA on ethylene production, extending storage life and maintenance of climacteric (nectarine and plum) and non-climacteric fruit (sweet orange) quality at ambient temperature and cold conditions was investigated. Beneficial effects of these coating treatments in regulating ethylene production, fruit softening, reducing weight loss and diseases and quality parameters varied between climacteric and non-climacteric fruits, cultivars and storage conditions.

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16

Kerman, Ipek. "Synthesis And Characterization Of Poly(oxalic Acid Dithiophen-3-yl Methyl Ester) And Thiophene Ended Poly-&amp." Master's thesis, METU, 2004. http://etd.lib.metu.edu.tr/upload/2/12605014/index.pdf.

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Synthesis and characterization of thiophene ended poly-&amp<br>#949<br>-caprolactone (PCL) and oxalic acid dithiophen-3-yl methyl ester (ODME) and their copolymers with both pyrrole and thiophene were achieved. Chemical structure of the precursor polymer and monomer were investigated Redox behavior of polymer and monomers were determined by Cyclic Voltammetry (CV). Structural characterization of samples were carried out by 1H, 13C Nuclear Magnetic Resonance (NMR) and Fourier Transform Infrared Spectroscopy (FTIR). Conductivities of the films were measured by using four probe technique. Therma

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17

Eaton, Gregory K. "Oxalic acid production by the ectomycorrhizal fungus Hebeloma westraliensis and its role in the nutrient acquisition and growth of Eucalyptus diversicolor in calcareous soil." Thesis, Virginia Tech, 1994. http://hdl.handle.net/10919/41292.

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This work includes an introduction and literature review of mycorrhizal enhancement of the mineral nutrition of host plants. Particular attention was paid to the role of mycorrhizae in acquiring P from inorganic phosphates. Two experiments were designed to study a mechanism by which the ectomycorrhizal fungus Hebeloma westraliensis can enhance the availability and absorption of P from Ca phosphate by <u>Eucalyptus diversicolor</u> in calcareous soil. Chapter 2 reports on a study on the growth and oxalic acid production of <u>H. westraliensis</u> in calcareous and noncalcareous liquid media. Ox

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18

Erman, Munir. "A Novel Mechanism for Oxalic Acid Biosynthesis Coordinating with Energy Generating Systems in the Wood-Rotting Basidiomycete Fomitopsis palustris." Kyoto University, 2002. http://hdl.handle.net/2433/149889.

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Kyoto University (京都大学)<br>0048<br>新制・課程博士<br>博士(農学)<br>甲第9597号<br>農博第1225号<br>新制||農||840(附属図書館)<br>学位論文||H14||N3629(農学部図書室)<br>UT51-2002-G355<br>京都大学大学院農学研究科応用生命科学専攻<br>(主査)教授島田幹夫, 教授加藤暢夫, 教授江﨑信芳<br>学位規則第4条第1項該当

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19

Tyler, Simon Nicholas George. "Asymmetric synthesis using enantiopure dihydro-2H-1,4-oxazin-2-one templates." Thesis, University of Reading, 1998. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.266800.

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20

Sjöde, Anders. "Chemical characterization in the biorefinery of lignocellulose : formation and management of oxalic acid and analysis of feedstocks for bioethanol production /." Karlstad : Faculty of Technology and Science, Chemistry, Karlstad University, 2008. http://www.diva-portal.org/kau/abstract.xsql?dbid=1362.

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21

Bajunaid, Mohammad. "Electrodeposition of Hydrogen Molybdenum Tungsten Bronze Films and Electrochemical Reduction of Carbon Dioxide." Digital Commons @ East Tennessee State University, 2021. https://dc.etsu.edu/etd/3857.

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The foremost aim for performing this study was to focus on the electrodeposition of mixed hydrogen molybdenum tungsten bronze films, which have the potential for e– transfer interactions carrying out the reduction of carbon dioxide. A yellow peroxymolybdic tungstate solution was prepared and used for the electrodeposition of hydrogen molybdenum tungsten bronze films on conductive carbon paper. Electrodeposition was carried out at -2.0 V from 20 - 120 minutes to determine the effect of deposition time on film thickness and CO2 reduction. These films were characterized by X-ray photoelectron spe

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22

Ndlovu, Bongani. "Kimberlite weathering : effects of organic reagents." Diss., University of Pretoria, 2013. http://hdl.handle.net/2263/33354.

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Diamonds are commonly present in an ore called kimberlite. Kimberlites vary extensively in mineralogy and therefore can complicate the processing and the extraction of diamonds. Weathering of kimberlite was investigated in this study and refers to the rapid physical breakdown of the kimberlite material. Kimberlite weathering by organic molecule adsorption was investigated utilising organic solutions; ethanol, formamide, n-hexane, oxalic acid, urea, pentanoic acid and acetic acid, was investigated. The extent of weathering was measured by XRD, TGA and FTIR analysis as well as by evaluating chan

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23

Baptista, José Antonio Avelar. "Avaliação do poder de inibição do ácido oxálico frente ao aço carbono em soluções de diferentes pH's." Florianópolis, SC, 1998. http://repositorio.ufsc.br/xmlui/handle/123456789/77884.

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Dissertação (mestrado) - Universidade Federal de Santa Catarina, Centro de Ciências Físicas e Matemáticas. Programa de Pós-graduação em Química.<br>Made available in DSpace on 2012-10-17T08:23:00Z (GMT). No. of bitstreams: 0<br>Estudou-se o comportamento do Ácido Oxálico como inibidor de corrosão para o aço-carbono em soluções de diferentes pH#s (2,5 6,0). Empregou-se como métodos de análise o método gravimétrico (perda de massa por unidade de área de tempo) e o eletroquímico, empregando-se as técnicas Ecorr vs. tempo e curvas de polarização potenciodinâmicas. Os dois métodos mostraram-se con

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24

Bengraine, Karim. "Ozonation de solutions aqueuses : role de l'eau oxygenee." Paris 7, 1988. http://www.theses.fr/1988PA077176.

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Contribution a la meilleure connaissance des phenomenes impliques dans une filiere de traitement de l'eau, avec un interet plus particulier au role de l'eau oxygenee au cours de l'ozonation de solutions aqueuses. Etude de l'ozonation de molecules organiques (acides salicylique, phtalique et oxalique), des mecanismes mis en jeu et comparaison des produits obtenus par ozonation et par reaction de fenton

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25

Cherrad, Semcheddine. "Étude de la réponse adaptative du champignon filamenteux Botrytis cinerea à différents stress métalliques." Thesis, Lyon 1, 2011. http://www.theses.fr/2011LYO10182.

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De nombreux métaux sont indispensables au métabolisme cellulaire, d’autres sont considérés toxiques même à de faibles concentrations. Différents champignons appartenant à des différents groupes taxonomiques ont été identifiés dans des milieux pollués et ont révélé une capacité à survivre et à croître en présence de concentrations potentiellement toxiques. Pour s'adapter à ce stress, les champignons ont développé plusieurs mécanismes au niveau intracellulaire et extracellulaire. En particulier, ils sont connus pour leur capacité à sécréter un large panel de protéines. Cependant, leur rôle dans

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26

Ibrahim, Mohamed Asim Y. "Co-processing of drugs and co-crystal formers and its effect on pharmaceutical dosage-form performance. Co-crystallization of urea/ 2-methoxybenzamide, caffeine/ malonic acid, caffeine/ oxalic acid and theophylline/ malonic acid systems: Solid-state characterization including imaging, thermal, X-ray and Raman spectroscopic techniques with subsequent evaluation of tableting behaviour." Thesis, University of Bradford, 2008. http://hdl.handle.net/10454/12760.

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This dissertation has focused on the solid-state characterization of different co-crystal system as well as the effect of co-crystallization of these systems on pharmaceutical dosage form performance. Urea/ 2-MB, caffeine/ malonic acid, caffeine/ oxalic acid and theophylline/ malonic acid co-crystals were prepared using co-grinding- and co-precipitation techniques. In addition, the synthesis of co-crystals through two novel methods has been demonstrated. This includes compaction and convection mixing. The solid-state characterization of the co-crystals has been carried out using XRPD, Raman sp

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27

Lima, Darlon Martins [UNESP]. "Avaliação da resistência de união de diferentes sistemas adesivos à dentina bovina: influência de agentes dessensibilizantes." Universidade Estadual Paulista (UNESP), 2005. http://hdl.handle.net/11449/89648.

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Made available in DSpace on 2014-06-11T19:24:08Z (GMT). No. of bitstreams: 0 Previous issue date: 2005-02-23Bitstream added on 2014-06-13T19:51:24Z : No. of bitstreams: 1 lima_dm_me_arafo.pdf: 826526 bytes, checksum: ff1d690d6b0676f46d0b484cb8adef94 (MD5)<br>Coordenação de Aperfeiçoamento de Pessoal de Nível Superior (CAPES)<br>O objetivo deste trabalho foi o de avaliar comparativamente in vitro, a resistência de união ao cisalhamento de uma resina composta à dentina bovina em função da combinação de três diferentes sistemas adesivos e de dois diferentes agentes dessensibilizantes. Foram uti

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28

Ibrahim, Mohamed Asim Yousif. "Co-processing of drugs and co-crystal formers and its effect on pharmaceutical dosage-form performance : co-crystallization of urea/2-methoxybenzamide, caffeine/malonic acid, caffeine/oxalic acid and theophylline/malonic acid systems : solid-state characterization including imaging, thermal, X-ray and Raman spectroscopic techniques with subsequent evaluation of tableting behaviour." Thesis, University of Bradford, 2008. http://hdl.handle.net/10454/12760.

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This dissertation has focused on the solid-state characterization of different co-crystal system as well as the effect of co-crystallization of these systems on pharmaceutical dosage form performance. Urea/ 2-MB, caffeine/ malonic acid, caffeine/ oxalic acid and theophylline/ malonic acid co-crystals were prepared using co-grinding- and co-precipitation techniques. In addition, the synthesis of co-crystals through two novel methods has been demonstrated. This includes compaction and convection mixing. The solid-state characterization of the co-crystals has been carried out using XRPD, Raman sp

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29

Fernandes, João Roberto. "Metodologias analiticas enzimaticas para analise de oxalato em amostras de interesse biologico." [s.n.], 1996. http://repositorio.unicamp.br/jspui/handle/REPOSIP/250393.

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Orientadores: Graciliano de Oliveira Neto, Matthieu Tubino<br>Tese (doutorado) - Universidade Estadual de Campinas, Instituto de Quimica<br>Made available in DSpace on 2018-07-20T23:54:51Z (GMT). No. of bitstreams: 1 Fernandes_JoaoRoberto_D.pdf: 3252573 bytes, checksum: 31beb37c9573e43497605df909d2bfc6 (MD5) Previous issue date: 1996<br>Doutorado

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30

Upadhyay, Swapna [Verfasser], Johannes G. [Akademischer Betreuer] Filser, Erich F. [Akademischer Betreuer] Elstner, and Michael [Akademischer Betreuer] Schemann. "Bioavailability of ethylene glycol and its metabolites glycolic acid and oxalic acid in volunteers following inhalation and dermal exposure to ethylene glycol / Swapna Upadhyay. Gutachter: Erich F. Elstner ; Michael Schemann. Betreuer: Johannes G. Filser." München : Universitätsbibliothek der TU München, 2006. http://d-nb.info/1054345775/34.

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Zhang, Shuo. "Physical properties and crystallization of theophylline co-crystals." Licentiate thesis, KTH, Transport Phenomena, 2010. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-13255.

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<p>This work focuses on the physical properties and crystallization of theophyline co-crystals. Co-crystals of theophylline with oxalic acid, glutaric acid and maleic acid have been investigated.</p><p>The DSC curves of these co-crystals show that their first endothermic peaks are all lower than the melting temperature of theophylline. The decomposition temperature of theophylline – oxalic acid co-crystal is at about 230 °C, determined by DSC together with TGA. After decomposition, the remaining theophylline melts at about 279 °C, which is higher than the known melting temperature of theophyll

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Forti, Juliane Cristina. "Aplicação de eletrodos de óxidos ativados em eletrooxidação orgânica: oxidação de formaldeído, acetaldeído e ácido oxálico." Universidade de São Paulo, 2005. http://www.teses.usp.br/teses/disponiveis/59/59138/tde-23012007-151800/.

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Este trabalho apresenta a preparação e caracterização de eletrodos de óxidos do tipo ânodos dimensionalmente estáveis (ADE) de composição nominal Ti/Ru0,3Ti0,7O2, modificados pela adição de metais em sua superfície. A introdução de um metal modulador permitiu alterar de forma significativa o comportamento eletroquímico de todo o recobrimento. A modificação do ADE foi realizada através de eletrodeposição de Pt e PbO2 e de deposição química de catalisadores nanodivididos (Pt e Pt-Ni). O objetivo desta preparação foi modular as propriedades dos ânodos visando melhorar as propriedades eletrocatalí

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Lima, Darlon Martins. "Avaliação da resistência de união de diferentes sistemas adesivos à dentina bovina : influência de agentes dessensibilizantes /." Araraquara : [s.n.], 2005. http://hdl.handle.net/11449/89648.

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Orientador: Maria Salete Machado Cândido<br>Banca: José Roberto Cury Saad<br>Banca: Patricia dos Santos Jardim<br>Resumo: O objetivo deste trabalho foi o de avaliar comparativamente "in vitro", a resistência de união ao cisalhamento de uma resina composta à dentina bovina em função da combinação de três diferentes sistemas adesivos e de dois diferentes agentes dessensibilizantes. Foram utilizados os sistemas adesivos: Single Bond, Master Bond e Prime & Bond 2.1 e os seguintes agentes dessensibilizantes: o Oxagel e o G. H. F. Dessensibilizador. Para a confecção dos corpos de prova, 90 incisivos

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Mendes, Andre Aguiar. "Importância dos mediadores de baixa massa molar na biodegradação de madeira por Ceriporiopsis subvermispora." Universidade de São Paulo, 2008. http://www.teses.usp.br/teses/disponiveis/97/97131/tde-20092012-122707/.

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O fungo de podridão branca Ceriporiopsis subvermispora é seletivo na degradação de lignina em estágios curtos de colonização de madeira e dessa forma tem sido uma das espécies mais estudadas em biopolpação, que consiste em um tratamento biológico de cavacos de madeira que antecede etapas convencionais de polpação. Para degradar a lignina na parede celular vegetal esse fungo secreta a enzima manganês-peroxidase (MnP), a qual necessita de ácido oxálico para transportar o íon Mn3+ oriundo do seu ciclo catalítico. O complexo quelante-Mn3+ gerado degrada apenas porções fenólicas da lignina. Porém,

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Sartori, Neimar. "Avaliação clínica do uso de um agente dessensibilizante no controle da sensibilidade pós-operatória e no desempenho clínico de restaurações classe v de resina composta." Florianópolis, SC, 2008. http://repositorio.ufsc.br/xmlui/handle/123456789/91064.

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Dissertação (mestrado) - Universidade Federal de Santa Catarina, Centro de Ciências da Saúde. Programa de Pós-graduação em Odontologia<br>Made available in DSpace on 2012-10-23T18:25:42Z (GMT). No. of bitstreams: 1 264740.pdf: 1289011 bytes, checksum: 8e3295514ee069e23f657867c7117ab8 (MD5)<br>Este estudo teve por objetivo avaliar a sensibilidade pós-operatória e o desempenho clínico de restaurações de resina composta em lesões cervicais não-cariosas (LCNC), com ou sem o uso de agente dessensibilizante à base de oxalato de potássio, por 18 meses. Foram restauradas 144 lesões em 42 pacientes sel

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Oliveira, Marcelo de. "Investigação do ácido etanodióico na formação de filmes superficiais sobre zinco e avaliação do efeito destes filmes na resistência à corrosão." Universidade de São Paulo, 2017. http://www.teses.usp.br/teses/disponiveis/85/85134/tde-19022018-101642/.

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Um dos métodos mais utilizados para proteção contra a corrosão de aços comuns consiste na proteção catódica com revestimentos metálicos eletroquimicamente mais ativos, que estes. Os revestimentos de zinco são os mais usados para este tipo de proteção. De forma a protegerem o substrato, estes revestimentos devem atuar como anodos de sacrifício, sofrendo corrosão e transformando o substrato de aço em catodo. Todavia, não é de interesse, que o revestimento de zinco apresente altas taxas de corrosão de forma que a proteção contra a corrosão conferida ao aço seja duradoura. Uma das formas mais empr

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Ferreira, Murilo de Souza. "Variabilidade espacial e temporal da reaeração superficial em riachos: estimativa por meio dos métodos do traçador gasoso e da sonda solúvel flutuante." Universidade de São Paulo, 2018. http://www.teses.usp.br/teses/disponiveis/18/18138/tde-20062018-145344/.

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A reaeração superficial é um importante fenômeno físico responsável pela transferência de massa do oxigênio atmosférico para o curso de água, através da interface ar-água. Esse fenômeno é caracterizado quantitativamente pelo coeficiente de reaeração superficial (K2). O K2 pode ser influenciado por diversos fatores naturais, em especial, a turbulência, que é afetada pelas características físicas, hidrológicas e hidráulicas do escoamento da água. Este coeficiente é comumente utilizado em modelos ambientais de qualidade da água, o que implica na necessidade da sua correta estimativa. A estimativa

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Hriczo, Filip. "Vliv změny vstupních parametrů na výrobu nanoporézní keramiky." Master's thesis, Vysoké učení technické v Brně. Fakulta elektrotechniky a komunikačních technologií, 2010. http://www.nusl.cz/ntk/nusl-218572.

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This thesis examines and tests acids and conditions, which make the production of nanoporous ceramic at the thin aluminium layer the most effective and provide the highest quality. This paper describes the production of nanoporous structures with pore size 15-400 nm, depending on the electrolyte. Creating a regular hexagonal structure by electrochemical oxidation is dependent on many parameters that affect the regularity of structure and parameters of the ceramics produced. They were investigated primarily by changes in temperature and input voltage. All results were examined by SEM analysis.

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Hilgert, Leandro Augusto. "Adesão à dentina." Florianópolis, SC, 2006. http://repositorio.ufsc.br/xmlui/handle/123456789/89167.

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Dissertação (mestrado) - Universidade Federal de Santa Catarina, Centro de Ciências da Saúde. Programa de Pós-Graduação em Odontologia<br>Made available in DSpace on 2012-10-22T17:33:39Z (GMT). No. of bitstreams: 1 226738.pdf: 7998368 bytes, checksum: 9628cbe288784e31e6db5413f4e49dc0 (MD5)<br>O objetivo deste estudo in vitro foi avaliar a influência da oclusão tubular e da desproteinização dentinária na adesão entre dentina e resina composta. As metodologias utilizadas foram: análise em microscopia eletrônica de varredura (MEV) das superfícies dentinárias tratadas, antes da aplicação do sistem

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Vilela, Rivelino Cunha. "Estudo de transições de fase em cristais de l-alanina + ácido oxálico." reponame:Repositório Institucional da UFC, 2013. http://www.repositorio.ufc.br/handle/riufc/13883.

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VILELA, Rivelino Cunha. Estudo de transições de fase em cristais de l-alanina + ácido oxálico. 2013. 113 f. Tese (Doutorado em Física) - Programa de Pós-Graduação em Física, Departamento de Física, Centro de Ciências, Universidade Federal do Ceará, Fortaleza, 2013.<br>Submitted by Edvander Pires (edvanderpires@gmail.com) on 2015-10-29T21:51:24Z No. of bitstreams: 1 2013_tese_rcvilela.pdf: 12577577 bytes, checksum: 4dc32419c1bbdde79375612c04227181 (MD5)<br>Approved for entry into archive by Edvander Pires(edvanderpires@gmail.com) on 2015-11-03T19:48:22Z (GMT) No. of bitstreams: 1 2013_tese_rcvi

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Gostu, Sumedh. "Investigation Of Chemical Processes For The Production Of Commercially Viable High Volume Value-Added Products From Bauxite Residue." Digital WPI, 2018. https://digitalcommons.wpi.edu/etd-dissertations/531.

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Bayer processing of bauxite employed for production of alumina yield a residue red-mud. The worldwide annual-rate of red-mud generation is approximately 120 million tons, and most of this is stockpiled. Red mud is rich in elements like aluminum, titanium and rare earths, in addition to the major iron-bearing constituents. The objective of this research is to explore such a strategy to extract Iron as fine particulate magnetite. Pyrometallurgical reduction experiments using carbon mixtures and a novel hydrometallurgical route are experimented. Reduction experiments performed with petroleum coke

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Cosway, Sarah M. "Desymmetrization of Meso-epoxides and related structures via Oxazin-2-one generation and modification : a general approach to cyclic and acyclic #alpha#-amino acids." Thesis, University of Reading, 1998. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.266045.

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Berná, Galiano Antonio. "Estudio espectroelectroquímico de los equilibrios ácido-base de especies adsorbidas sobre electrodos metálicos con superficies monocristalinas bien definidas." Doctoral thesis, Universidad de Alicante, 2014. http://hdl.handle.net/10045/45809.

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Glue, Joshua Barnaby. "Engineering Allium White Rot Disease Resistance in Allium Species and Tobacco Model Species." Thesis, University of Canterbury. School of Biological Sciences, 2009. http://hdl.handle.net/10092/3513.

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Allium white rot (AWR) is a soilborne disease that seriously damages commercial cultivation of onion (Allium cepa) and garlic (Allium sativum) crops. The disease has been found everywhere onions are cultivated and at present no system of control has been found that fully prevents the occurrence of the disease. The fungus responsible for the disease, Sclerotium cepivorum, uses oxalic acid to kill Allium bulb and root tissue in growing onion and garlic plants. Research suggests recombinant oxalate oxidase and oxalate decarboxylase enzymes may be able to degrade this acid and confer resistance ag

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Vilela, Rivelino Cunha. "ESTUDO DE TRANSIÃÃES DE FASE EM CRISTAIS DE L-ALANINA + ÃCIDO OXÃLICO." Universidade Federal do CearÃ, 2013. http://www.teses.ufc.br/tde_busca/arquivo.php?codArquivo=10397.

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CoordenaÃÃo de AperfeiÃoamento de Pessoal de NÃvel Superior<br>Neste trabalho, estudou-se o efeito da temperatura nos espectros Raman de cristais de L-alanina + Ãcido oxÃlico, C3H8NO2+.C2HO4-. Foram realizadas medidas de espectroscopia Raman em policristais a diferentes temperaturas no intervalo compreendido entre a temperatura ambiente e a temperatura de 20 K, sendo fornecida uma identificaÃÃo tentativa para todos os modos normais de vibraÃÃo observados. Para auxiliar o entendimento do comportamento do cristal tambÃm foram obtidos os difratogramas de raios-X bem como estudada a dependÃncia do

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Sartarelli, Natália Cecília. "Estudo do teor de ácido oxálico em hortaliças e frutos, seu potencial de cristalização in vitro e caracterização morfológica de cristais de oxalato de cálcio." Araraquara, 2018. http://hdl.handle.net/11449/155899.

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Orientador: Luis Vitor Silva do Sacramento<br>Banca: Mary Rosa Rodrigues de Marchi<br>Banca: Amanda Martins Baviera<br>Resumo: Objetivos: Analisar quali e quantitativamente algumas hortaliças e frutos, quanto ao teor de ácido oxálico e avaliar o comportamento químico do ácido oxálico frente a agentes indutores e inibidores de cristalização in vitro. Métodos: A análise qualitativa morfológica de cristais de oxalato de cálcio foi feita sob microscopia ótica de luz polarizada e, quantitativamente foram determinados por método espectrofotométrico, os teores de ácido oxálico após extração com água

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Badufle, Margaux. "Nouvelle méthode pour la synthèse d'acides N-aryloxamiques et applications." Electronic Thesis or Diss., Bordeaux, 2024. http://www.theses.fr/2024BORD0365.

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Ce manuscrit présente un nouveau procédé de synthèse d’acides oxamiques aromatiques et leur utilisation en tant que précurseurs de radicaux carbamoyles, pour promouvoir une chimie plus verte et plus sûre des isocyanates. La première étape de ce procédé consiste en une réaction de couplage croisé d’Ullmann-Goldberg entre un iodure d’aryle et un oxamate primaire. Son optimisation a mis en évidence l’influence significative du substituant de l’oxamate sur le rendement de la réaction, et différents modes de désactivation du catalyseur. Un grand nombre d’oxamates aromatiques ont ainsi été synthétis

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Мазанка, Вероніка Михайлівна. "Кулонометричний генератор дiоксиду карбону для створення перевiрочних сумiшей". Master's thesis, КПІ ім. Ігоря Сікорського, 2020. https://ela.kpi.ua/handle/123456789/34820.

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Робота апробована на Всеукраїнському студенському контурсі.<br>Дисертація присвячена дослідженню електрохімічної поведінки електродних матеріалів в розчинах оксалатної кислоти для контрольованого генерування діоксиду карбону з високим виходом за струмом в кулонометричному генераторі, який може бути використаний для перевірки роботоспроможності засобів моніторингу концентрації вуглекислого газу в повітряному середовищі. Показано високу стійкість неіржавної сталі в розчинах оксалатної кислоти за умов катодної поляризації та після вимкнення катодного струму. Досліджено електрокаталітичні властив

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Neves, Nathalia Costa Viana. "Aplica??o da t?cnica eletroanal?tica de pulso diferencial usando o eletrodo de carbono v?treo modificado com ciste?na para monitorar a degrada??o eletroqu?mica de ?cido ox?lico." Universidade Federal do Rio Grande do Norte, 2013. http://repositorio.ufrn.br:8080/jspui/handle/123456789/17732.

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Made available in DSpace on 2014-12-17T15:42:11Z (GMT). No. of bitstreams: 1 NathaliaCVN_DISSERT.pdf: 2020842 bytes, checksum: efcd9ca5e5cfd7d63412f72c80546c39 (MD5) Previous issue date: 2013-07-31<br>In this paper, the technique of differential pulse voltammetry (DPV) has been studied for monitoring the concentration of oxalic acid (OA) during their electrochemical oxidation (EO) in acidic medium using platinum anode supported on titanium (Ti / Pt). The DPV was standardized and optimized using a glassy carbon electrode modified with cysteine. The modification with cysteine was developed ele

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Vaudez, Stéphane. "Frittage des combustibles MOX : influence des conditions d’élaboration et de la pression partielle d’oxygène." Thesis, Bordeaux, 2022. http://www.theses.fr/2022BORD0117.

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Les phénomènes de diffusion se produisant lors du frittage des oxydes mixtes d’uranium et de plutonium (MOX) dépendent du potentiel d’oxygène de l’atmosphère du four. L’atmosphère et la température engendrent des écarts à la stœchiométrie oxygène, appelée rapport O/M, dans l’oxyde mixte U1-yPuyO2±x. Ces travaux de thèse ont porté sur une meilleure connaissance de l’évolution du rapport O/M et de la microstructure des céramiques en fonction de la composition du mélange UO2/PuO2/(UPu)O2 et du potentiel d’oxygène au cours du frittage. Leurs effets sur la densification et les microstructures ont é

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