Bibliografias temáticas / Anti-Oxidation

Literatura científica selecionada sobre o tema "Anti-Oxidation"

Autor: Grafiati

Publicado: 22 de junho de 2024

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Artigos de revistas sobre o assunto "Anti-Oxidation":

Wang, Hai Chuan, Zhi You Liao, Shi Jun Wang, Yun Zhou e Yuan Chi Dong. "Performance of Anti-Erosion and Anti-Oxidation of High Al Steels at 1373K". Advanced Materials Research 549 (julho de 2012): 679–82. http://dx.doi.org/10.4028/www.scientific.net/amr.549.679.

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The effect of Al content on the anti-erosion and anti-oxidation performance of high Al steels at 1373K is studied in this paper. By 168-hour heat treating at 1373 K and at oxidation atmosphere, These results show that for comparing non-Al steel and low-Al (w[Al]=1.14%) steel sample there are a more obvious and easily-dropping oxidation layer in surface in 24 h , the average oxidation rate is up to 0.406 mg/(cm2.h), but for high Al steel, there is a thinner gray oxidation layer in surface and a more fast oxidation rate for w[Al]<5% sample , and there is a thin, close and yellow gloss film and the average oxidation rate is only 0.016 mg/(cm2.h) for w[Al]=8.46% sample. The average erosion rate is 0.096 mg/cm2.h in initial 24 h and thereafter the erosion is very slow. But there is a higher erosion rate and the average erosion rate is 0.594 mg/(cm2.h) in 6 % HCl solution for high Al steel sample and comparing non-Al steel. Accordingly high Al steel possesses a good performance of high temperature anti-oxidation and anti-erosion in NaCl solution.

Chen, Hua Sheng, Hua Zhi Gu, Yan Wen Zhang, Xi Lai Chen, Guo Tao Xu e Gai Feng Xue. "Preparation of Anti-Oxidation Coating on Billet Heating for Silicon Steel". Advanced Materials Research 314-316 (agosto de 2011): 155–59. http://dx.doi.org/10.4028/www.scientific.net/amr.314-316.155.

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Based on the perspective of the linear expansion coefficient, an anti-oxidation coating on billet heating for silicon steel was prepared. The anti-oxidation coating can be used at 1400oC and it has good property of automatic pelling off, and the oxidation burning loss was decreased by 80.65%. The microstructure of the coating was observed by scanning electron microscope. The results indicate that the high-temperature anti-oxidation mechanism of the coating on the surface of steel billet is cavity clogged by molten slag, and the service life of anti-oxidation coating is relied on the resistance to permeation and erosion of molten slag.

Xu, Ying, Peng Wang e Jian Lu. "Anti-Oxidation Coatings for Steel Billets at High Temperature". Advanced Materials Research 791-793 (setembro de 2013): 448–51. http://dx.doi.org/10.4028/www.scientific.net/amr.791-793.448.

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A new kind of anti-oxidation coating for steel billets at high temperature was prepared. The resistance property of the coatings for oxidation was investigated. The result indicated that the coatings could decrease the oxidation loss at 1300¡æ. The anti-oxidation mechanism of the coatings on the surface of steel billets at high temperature was proposed at the same time.

Cao, Xiao Zhou, Zhu Xian Qiu, Zhong Ning Shi, Xian Wei Hu, Yun Gang Ban e Zhao Wen Wang. "Anti-Oxidation and Anti-Corrosion Properties of Al-Si Metal Anodes". Materials Science Forum 546-549 (maio de 2007): 1149–52. http://dx.doi.org/10.4028/www.scientific.net/msf.546-549.1149.

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Al-Si metal anode was fabricated by cold-press sintering with Al and Si as embedded powder in argon atmosphere. The anti-oxidation in the air and anti-corrosion in molten cryolite properties of Al-Si metal anode at high temperature were examined. The experimental results showed that the oxidation kinetics curve obeyed the parabolic law. The corrosion behavior Al-Si metal anode was studied in electrolysis test. The electrolyte consisted of Na3AlF6(90 wt%),CaF2(5 wt%) and Al2O3(5 wt%) which corresponded to molecular ratio of 2.4. The results indicated that the cell voltage was stable and the electric polarized corrosion rate was higher than the static corrosion rate of metal anode. SEM photographs showed an oxidation film formed in the surface of Al-Si metal anode which can obstruct the further corrosion in molten cryolite. It may be concluded that Al-Si metal anode has good combination property and can replace the carbon anode in the aluminum cell.

Seo, Hyeong-Sik. "The Experimental Study on Anti-inflammation and Anti-oxidation of GaeYongHwan". Journal of Korean Institute of Herbal Acupuncture 12, n.º 3 (30 de setembro de 2009): 73–79. http://dx.doi.org/10.3831/kpi.2009.12.3.073.

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Zhang, Yu Dong, Xun Jia Su, Gen Liang Hou e Feng Guo. "Anti-Oxidation Behavior of Alumina Coating on Carbon Fibre by Sol-Gel Method". Advanced Materials Research 79-82 (agosto de 2009): 819–22. http://dx.doi.org/10.4028/www.scientific.net/amr.79-82.819.

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Alumina coating on carbon fibre were prepared by Sol-gel method, and characterized by thermal gravimetric analysis, X-ray diffraction and scanning electron microscopy. Affected factors such as coating times, oxidation temperature and time were investigated. The results show alumina coatings on carbon fibres are crack-free with a smooth surface, therefore would improve anti-oxidation of carbon fibre significantly. Thickness is one of the most important factors on anti-oxidation of alumina coating, and in this work, thicker coatings have better anti-oxidation quality.

Fan, Zi Min, Hui Qing Fan e Xiao Gang Wang. "Industrial Preparation of SiC Ceramic Coating for High Temperature and Anti-Oxidation of C/C Composites". Advanced Materials Research 189-193 (fevereiro de 2011): 147–51. http://dx.doi.org/10.4028/www.scientific.net/amr.189-193.147.

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A SiC ceramic coating for high temperature and anti-oxidation was prepared by high temperature reaction and PVD methods inside industrial synthetic furnace of SiC. Its phase composition and microstructure were characterized by using XRD, SEM,and its high temperature anti-oxidation property were studied by isothermal oxidation tests.The results showed that the coating is composed of mainly α-SiC and β-SiC,the coating is uniform, compact, perfect grain growth, without crack, closely with the C/C materials,the thickness is about 600μm. After 10h oxidation in air at 1773 k the weight loss of the coating was only 0.3%,which implies that the coating has excellent anti-oxidation ability.

Zhou, Jingyi, Zhihong Tan e Jiale Shi. "Research on the influence of high temperature oxidation environment on the properties of C/C composite material". Vibroengineering PROCEDIA 49 (18 de maio de 2023): 174–79. http://dx.doi.org/10.21595/vp.2023.23198.

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In this paper, the influence of extreme service environment on the mechanical properties of C/C composites was analyzed. The mechanical tests for ordinary C/C samples and C/C samples with anti-oxidation coating were carried out under various high temperature and oxidation conditions. The properties of C/C composites with anti-oxidation coating were focused on. It was pointed out that the material properties were mainly affected by the coupling factors of high temperature, pre-stress, oxidation environment and duration. The influence laws of these factors for the high temperature strength of C/C composites with anti-oxidation coating were further discussed and summarized.

Ma, Y. L., Gui Zhen Fang e Shu Jun Li. "Anti-Oxidation of Photo-Degradation Alkali Lignin". Advanced Materials Research 838-841 (novembro de 2013): 2379–82. http://dx.doi.org/10.4028/www.scientific.net/amr.838-841.2379.

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Photo-degradation alkali lignin was prepared in sunlight by the system of TiO2 and squaraine dye (QSC). The antioxidant activity of photo-degradation was researched. The results showed that the phenolic hydroxyl of degradation alkali lignin is 5.63% with the control is 4.64%, and alcoholic hydroxyl of degradation alkali lignin is 3.21% with the control is 3.77%. The order of antioxidant activity was as following. 2,6-di-tert-butyl-4-methylphenol > high-phenol lignin > the control lignin.

FUJITA, Akiko, Koichi MASUMOTO, Koji KAWAKAMI, Takashi MIKAMI e Masato NOMURA. "Anti-Oxidation Activity of Various Rice Brans". Journal of Oleo Science 55, n.º 11 (2006): 585–91. http://dx.doi.org/10.5650/jos.55.585.

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Mais fontes

Teses / dissertações sobre o assunto "Anti-Oxidation":

Oues, Adnan Khalil. "PROTECTION OPTIMIZATION OF CARBON-CARBON COMPOSITES AGAINST AIR OXIDATION BY COATING WITH ANTI-OXIDANTS". OpenSIUC, 2017. https://opensiuc.lib.siu.edu/dissertations/1376.

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AN ABSTRACT OF THE DISSERTATION OF TITLE: (OPTIMIZATION PROTECTION OF CARBOB-CARBON COMPOSITES DISC-BRAKES MATERIAL BY COATING WITH ANTI-OXIDANTS) Developing glass enhancer mixture solutions (Ki’s), which promote the formation of a stable glass layer, homogenous clear liquid solution, and low viscosity liquid form, are easy to apply, and penetrating. They are compatible with ceramic liquid glass based anti-oxidants for treating surfaces of carbon/carbon composites material, and significantly increase the rate of protection against oxidation. Ki’s’ are comprised of mixing chemical compositions at standard temperature and pressure conditions from group one and two such as Na, K, Ca, Mg, etc. of 5 to 25 wt. %, deionized water from 95 to 75 % by weight, and adding up to 1 % by weight of surfactants such as DF-16, DF-20, and CF-10 with specific proportions, and followed by thorough stirring to produce a homogeneous blend of mixture solution. The glass enhancers, which are aqueous mixture solutions, are applied to the surfaces of carbon/carbon (C/C) composites by dipping, brushing, spraying, or other painting application techniques, followed by annealing, or a heat-treating range of 80 to 110 ℃ for a minimum of 8 hours, and allowing cooling time of the coated C/C composites of a minimum of 12 hours to room temperature. Preferential compatibility of the glass enhancer mixture solutions (Ki's) is with liquid glass former's, anti-oxidants comprised mostly of borate and phosphate glasses. The glass enhancer solution mixtures (Ki’s) are supplemental additions to ceramics’ liquid anti-oxidants coatings used for carbon-carbon composites protection against oxidation, and it will increase the rate of protection against oxidation for low, and moderate temperature’s range from 400 to 900 ℃. The glass enhancer Ki’s mixture solutions should be used with liquid glass former's’ anti-oxidants, such as SiO₂, GeO₂, B₂O₃, and P₂O₅. A series of glass enhancer’s Ki’s, heat treatment cycle (char-cycle) ranged between 700 to 900 ℃, and application methods, were developed and tested experimentally. Two arbitrary isothermal temperatures of 650 ℃, and 871 ℃ were selected for thermal oxidation testing, and a temperature of 650 ℃ was selected, and tested against catalytic thermal oxidation. Additions of glass enhancer Ki’s improved protection of C/C composites disc-brakes against oxidation by double, and triple amount of time in hours versus the use of anti-oxidant coatings alone.

Chaganti, Pradeep. "PROTECTION OF CARBON/CARBON AIRCRAFT BRAKES FROM OXIDATION USING PHOSPHOROUS BASED ANTI-OXIDANT SYSTEM". OpenSIUC, 2011. https://opensiuc.lib.siu.edu/theses/644.

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Carbon/Carbon (C/C) composite is defined as a carbon fiber reinforced carbon matrix. Since 1958 research has been carried out on the C/C composites. The main reason for the development of new C/C composites is the number of advantages it has to offer when compared with the regular materials. The areas where C/C composites are being used extensively are aerospace, military, etc. These C/C composites have better physical, mechanical, thermal properties when compared to steel. That is the reason C/C brakes made a huge impact in the aerospace industry. The main drawback associated with the C/C brakes which are used in aerospace applications is the oxidation of the composite at higher temperatures. Also other problem linked with the C/C brake is the migration of the inhibitors on to the friction surface of the brake which can eventually decrease the friction coefficient of the brake material. So, characterizing the commercially available Anti-Oxidant(A/O) system, developing a new A/O system which can not only provide better oxidation protection, but also an improved anti-oxidant migration resistance will be our main goal of this project.

Bolin, Matthew Levi. "ADVANCED PHOSPHORUS BASED MIGRATION RESISTANT ANTI-OXIDANTS FOR CARBON-CARBON COMPOSITE AIRCRAFT BRAKES WITH INCREASED CATALYTIC OXIDATION RESISTANCE". OpenSIUC, 2013. https://opensiuc.lib.siu.edu/dissertations/722.

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Carbon-carbon composite brakes are one third the weight of typical steel brakes, and they attain strength and frictional properties at temperatures up to 1600°C. C/C composite brakes can endure high temperatures, but in the presence of oxygen they will begin to oxidize at 400°C. Anti-oxidant systems must be applied to the non-rubbing surfaces of the C/C composite stators and rotors to prevent oxidation. Currently, commercial phosphorus based coating materials are made of crystalline metal phosphates that are derived from heat treated phosphoric acid-based liquid precursors painted on the non-rubbing surface of C/C composites. These crystalline metal phosphate coatings are very porous and tend to move to the friction surface when exposed to increased levels of relative humidity. This anti-oxidant migration towards the rubbing surface causes a drop in frictional properties. Migration reduction and oxidation inhibition was improved upon with advanced anti-oxidant systems. The advanced antioxidants analyzed protected the C/C composite from thermal and catalytic oxidation six to ten times better at 650°C than commercial materials. At 871°C, the antioxidants protected the C/C composite from thermal oxidation ten times better than commercial materials. Migration of the antioxidant to the rubbing surfaces was eliminated through the use of advanced antioxidant compositions. The predicted life of the antioxidants was modeled using Avrami's equation. Characterization of the antioxidants was further analyzed through the use of SEM, EDS, and XRD systems.

Alexiou, Amanda Elton. "The effects of chromia coatings on the oxidation characteristics on Ni and Ni-20Cr". Thesis, Georgia Institute of Technology, 1998. http://hdl.handle.net/1853/15046.

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Feng, Ling, e Ling Feng. "Advanced oxidation processes for the removal of residual non-steroidal anti-inflammatory pharmaceuticals from aqueous systems". Phd thesis, Université Paris-Est, 2013. http://tel.archives-ouvertes.fr/tel-00952080.

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The thesis mainly focused on the implementation of advanced oxidation processes for the elimination of three non-steroidal anti-inflammatory drugs-ketoprofen, naproxen and piroxicam in waters. The three compounds are among the most used medicines, whose presence in waters poses a potential ecotoxicological risk. Due to the low pharmaceuticals removal efficiency of traditional wastwater treatement plants, worldwide concerns and calls are raised for efficient and eco-friendly technologies. Advanced oxidation processes, such as ozonation-biofiltration, electro-Fenton and anodic oxidation processes, which attracted a growing interest over the last two decades, could achieve almost complete destruction of the pollutants studied. Firstly, removal of selected pharmaceuticals from tap water was investigated by electrochemical advanced oxidation processes "electro-Fenton" and "anodic oxidation" with Pt or boron-doped diamond anode and carbon felt cathode at lab-scale. Removal rates and minieralization current efficencies under different operatioanl conditions were analysed. Meanwhile, intermediates produced during the mineralization were also identified, which helps to propose plausible oxidation pathway of each compound in presence of *OH. Finally, the evolution of the global toxicity of treated solutions was monitored using Microtox method, based on the fluorescence inhibition of Vibrio fischeri bacteria. In the second part, the three nonsteroidal anti-inflammatory molecules added in organics-free or surface water were treated under varying ozone treatment regimes with the quite well established technology ozone/biofiltration. A bench-scale biological film was employed to determine the biodegradability of chemical intermediates formed in ozonized surface water. Identification of intermediates formed during the processes and bacterial toxicity monitoring were conducted to assess the pharmaceuticals degradation pathway and potential biological effects, respectively

Feng, Ling. "Advanced oxidation processes for the removal of residual non-steroidal anti-inflammatory pharmaceuticals from aqueous systems". Thesis, Paris Est, 2013. http://www.theses.fr/2013PEST1109/document.

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La thèse a porté principalement sur la mise en œuvre de procédés d'oxydation avancée permettant l'élimination de trois anti-inflammatoires non stéroïdiens, le kétoprofène, le naproxène et le piroxicam dans l'eau. Ces trois composés sont parmi les médicaments les plus utilisés, dont la présence dans les eaux naturelles présente potentiellement un risque toxicologique. En raison de la faible efficacité d'élimination des produits pharmaceutiques par les stations traditionnels de traitement des eaux usées, les scientifiques se sont mis à la recherche de technologies de traitements efficaces et respectueuses de l'environnement. Les procédés d'oxydation avancée, comme l'ozonation-biofiltration, l'électro-Fenton et l'oxydation anodique peuvent permettre d'atteindre la destruction presque complète des polluants étudiés et de ce fait ils ont suscité un intérêt grandissant au cours des deux dernières décennies. Tout d'abord, ce travail s'intéresse à l'élimination de certains produits pharmaceutiques dans des solutions synthétiques préparées dans l'eau de robinet à l'aide des procédés électro-Fenton et oxydation anodique dans une cellule électrochimique équipée d'une anode de platine ou de diamant dopé au bore et d'une cathode de feutre de carbone. Cette étude a été menée à l'échelle du laboratoire. Les vitesses d'élimination des molécules pharmaceutiques ainsi que le degré de minéralisation des solutions étudiées ont été déterminées sous différentes conditions opératoires. Pendant ce temps, les sous-produits de l'oxidation générés au cours de la minéralisation ont également été identifiés, ce qui nous a permis de proposer les voies d'oxydation possible pour chaque composé pharmaceutique en présence du radical hydroxyl •OH. Enfin, l'évolution de la toxicité au cours des traitements a été suivie en utilisant la méthode Microtox, basée sur l'inhibition de la fluorescence des bactéries Vibrio fischeri. Dans la deuxième partie de ce travail de thèse, les trois anti-inflammatoires non stéroïdiens ont été ajoutés dans une eau déminéralisée ou dans une eau de surface. Ces eaux ont été traitées à l'aide de différentes doses d'ozone; puis le traitement à l'ozone à été combiné à un traitement biologique par biofiltration. Un biofilm biologique déposé à la surface d'un filtre de charbon actif a été utilisé pour déterminer la biodégradabilité des sous-produits d'oxydation formés dans les eaux de surface ozonée. L'identification des intermédiaires formés lors des processus de traitement et des contrôles de toxicité bactérienne ont été menées pour évaluer la voie de dégradation des produits pharmaceutiques et des effets biologiques potentiels, respectivement
The thesis mainly focused on the implementation of advanced oxidation processes for the elimination of three non-steroidal anti-inflammatory drugs-ketoprofen, naproxen and piroxicam in waters. The three compounds are among the most used medicines, whose presence in waters poses a potential ecotoxicological risk. Due to the low pharmaceuticals removal efficiency of traditional wastwater treatement plants, worldwide concerns and calls are raised for efficient and eco-friendly technologies. Advanced oxidation processes, such as ozonation-biofiltration, electro-Fenton and anodic oxidation processes, which attracted a growing interest over the last two decades, could achieve almost complete destruction of the pollutants studied. Firstly, removal of selected pharmaceuticals from tap water was investigated by electrochemical advanced oxidation processes “electro-Fenton” and “anodic oxidation” with Pt or boron-doped diamond anode and carbon felt cathode at lab-scale. Removal rates and minieralization current efficencies under different operatioanl conditions were analysed. Meanwhile, intermediates produced during the mineralization were also identified, which helps to propose plausible oxidation pathway of each compound in presence of •OH. Finally, the evolution of the global toxicity of treated solutions was monitored using Microtox method, based on the fluorescence inhibition of Vibrio fischeri bacteria. In the second part, the three nonsteroidal anti-inflammatory molecules added in organics-free or surface water were treated under varying ozone treatment regimes with the quite well established technology ozone/biofiltration. A bench-scale biological film was employed to determine the biodegradability of chemical intermediates formed in ozonized surface water. Identification of intermediates formed during the processes and bacterial toxicity monitoring were conducted to assess the pharmaceuticals degradation pathway and potential biological effects, respectively

Acerson, Mark Jeffrey. "Synthesis of 4'-Ester Resveratrol Analogues, Chromium Trioxide Oxidation of Terpenes, and Synthesis of Mimics of (-)-Englerin A". BYU ScholarsArchive, 2014. https://scholarsarchive.byu.edu/etd/5458.

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4’ -ester analogues of resveratrol were synthesized using reaction conditions developed to produce mono-ester products in the presence of two other unprotected phenols. Basic conditions were employed to deprotonate the most acidic 4’ phenol followed by addition of anhydrides or acid chlorides to give the ester product. The reaction favored 4’-ester formation in polar aprotic solvents with DMSO being the optimal solvent. (—)-Englerin A is a guaiane-type sesquiterpene containing two ester side chains. Mimics of (—)-englerin A were proposed that retained the ester side chains while replacing the non-polar core with less complicated structures. These proposed mimic cores would maintain the three-dimensional positioning of the esters which are responsible for the anti-cancer activity of (—)-englerin A. Three mimics were synthesized using the bicyclic terpenes borneol and fenchol. Installation of the second ester on the terpene core was accomplished throught the development and optimization of a unique methylene oxidation using chromium trioxide in glacial acetic acid. These mimics were screened against two kidney cancer cell lines. The compounds were shown to have IC50 (inhibitory concentration for 50 % of cells) values above 30 µM.

Barros, Allen Lopes de. "Study on the degradation of pharmaceutials by advanced oxidation processes in aqueous medium". Universidade Federal do CearÃ, 2014. http://www.teses.ufc.br/tde_busca/arquivo.php?codArquivo=15954.

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Conselho Nacional de Desenvolvimento CientÃfico e TecnolÃgico
CoordenaÃÃo de AperfeiÃoamento de Pessoal de NÃvel Superior
The use of PET as a support material for TiO2 films in advanced oxidation processes (AOPs) for water treatment was investigated. A green, low-cost immobilization procedure was developed and the amount of deposited photocatalyst ranged from 0.036 to 0.202 mg per cm2 PET. Photocatalytic activity of the films was evidenced by degrading paracetamol solutions under UV radiation. The highest kinetic constants were observed for at least 0.09 mg TiO2 per cm2 PET. Scan Electron Microscopy (SEM) and Energy-Dispersive X-ray (EDX) analyses indicated 0.15 mg TiO2 per cm2 PET as enough to provide complete covering of the PET support. Characterization analyses were performed with a film after 30 h of use in a UV/TiO2/O3 reactor. According to SEM analyses, the photocatalyst was not detached from the PET support, while EDX and gravimetric data indicated the possibility of the TiO2 to have been contaminated by compounds present in the solution during the treatment. Further experiments were performed, concerning the study of the degradation of the pharmaceuticals paracetamol, ibuprofen, ketoprofen, and naproxen. Degradation studies were carried out in a pilot-scale reactor, by using several AOPâs, namely direct photolysis, heterogeneous photocatalysis, and ozonation, either individually or simultaneously. Special attention was given to the identification of significant factors considered, in order to contribute to the optimization of systems in which such AOPs or their combination can be used. Also, the detection and indication of degradation products is presented.
O uso de PET (politereftalato de etileno) como material de suporte para filmes de TiO2 foi estudado. Um procedimento de baixo custo e ambientalmente correto foi desenvolvido para a obtenÃÃo dos filmes e a quantidade de fotocatalisador depositada variou de 0,036 a 0,202 mg por cm2 de PET. A atividade fotocatalÃtica dos filmes obtidos foi evidenciada por ensaios de degradaÃÃo de paracetamol sob radiaÃÃo UV. As maiores constantes cinÃticas foram observadas quando 0.09 mg de TiO2 ou mais foram depositados por cm2 PET. AnÃlises por microscopia eletrÃnica de varredura (MEV) e energia dispersive de raios-X (EDX) indicaram que 0,15 mg de TiO2 por cm2 de PET foram suficientes para completa cobertura do suporte. AnÃlises de caracterizaÃÃo tambÃm foram realizadas em filmes com mais de 30 h de uso em sistema UV/TiO2/O3. De acordo com as anÃlises de MEV, o fotocatalisador nÃo foi removido do suporte de PET, enquanto dados de EDX e de anÃlise gravimÃtrica indicaram a probabilidade de contaminaÃÃo dos filmes por compostos presentes na soluÃÃo durante o tratamento. Outros experimentos foram realizados, relacionados ao estudo da degradaÃÃo dos fÃrmacos paracetamol, ibuprofeno, cetoprofeno e naproxeno. Os estudos de degradaÃÃo foram realizados em reator em escala piloto, utilizando-se diversos POAs (fotÃlise direta, fotocatÃlise heterogÃnea, ozonizaÃÃo) de forma individual ou simultaneamente. AtenÃÃo especial foi dada Ã identificaÃÃo dos fatores significativos, dentre aqueles considerados nos ensaios, de modo a contribuir para a otimizaÃÃo de sistemas em que estes POAs venham a ser utilizados. A detecÃÃo e indicaÃÃo de provÃveis produtos de degradaÃÃo tambÃm Ã apresentada.

Souza, Ester Carvalho de. "Estudo da oxidação do óleo de soja com diferentes concentrações de aditivos anti-oxidantes, para uso em tratamentos térmicos de têmpera". Universidade de São Paulo, 2007. http://www.teses.usp.br/teses/disponiveis/88/88131/tde-13062008-154649/.

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No presente trabalho são relatados os resultados obtidos através de ensaios de caracterização para os diferentes tipos de óleos vegetais estudados, no estado novo e puro, tais como viscosidade, número de acidez, índice de iodo, índice de saponificação, espectroscopia por infravermelho e curvas de resfriamento. Os mesmos ensaios foram realizados com as amostras de óleo de soja com diferentes concentrações de aditivos anti-oxidantes. As diferentes formulações feitas com óleo de soja foram submetidas ao um processo de envelhecimento acelerado, e após esse processo de oxidação, foram realizados novamente os mesmos ensaios. Pode-se então, comparar qual amostra sofreu menor oxidação durante um mesmo tempo de envelhecimento. Assim, pode-se verificar qual aditivo anti-oxidante obteve melhor desempenho, retardando o processo de oxidação no óleo de soja.
In this work has studied different types of vegetable oils such cotton, canola, sunflower, corn and soybean. Characterization in terms of viscosity, number of acidity, index of iodine, index of saponification and by infrared spectroscopy, were performed. Cooling performance was also evaluated. Those tests were performed before and after oxidation. Oxidation of the oils were obtained using a special apparatus, provoking degradation after 72 hours of test. Different formulations using soybean oil and antioxidants additivation were also evaluated. Better performance in terms of oxidation resistance was obtained with formulation 1% Irganox L109.

Sipp, Diane. "Approche compréhensive et nouvelles formulations pour la protection anti-oxydation du graphite". Electronic Thesis or Diss., Université de Lille (2022-....), 2023. http://www.theses.fr/2023ULILR052.

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Les travaux de cette thèse CIFRE, effectuée en collaboration entre l'UCCS et l'entreprise Mersen Gennevilliers, ont porté sur la compréhension de la protection anti-oxydation (PAO) du graphite, sur la résistance à l'exsudation du graphite protégé et sur l'élaboration de nouvelles formulations de protection. Le graphite étudié est utilisé dans le secteur aéronautique. La PAO est constituée d'une solution d'aluminophosphates imprégnée dans la porosité du graphite de façon à en protéger le volume complet. La protection obture en partie la porosité et limite l'accès aux sites actifs du graphite. Le procédé industriel d'imprégnation a été transposé au laboratoire, ce qui a permis de comparer le comportement de la PAO dans la porosité du graphite et en creuset. L'effet du traitement thermique, de l'humidité, du rapport P/Al et de la porosité sur les phases présentes a été investigué par RMN et DRX. Les pièces de graphite imprégnées étant sujettes à une dégradation en conditions hydrothermales, une phase résistante a été identifiée et stabilisée dans la porosité en faisant varier le rapport P/Al de la solution. De nouvelles formulations de PAO, où une partie de l'aluminium a été substitué par différents cations, ont été testées, et leurs performances comparées avec une solution d'aluminophophates seule, mais elles n'ont pas mené à une amélioration de la protection anti-oxydation
This work has been conducted in collaboration between UCCS and the company Mersen Gennevilliers. The aims were to investigate the existing anti-oxidation protection (AOP) of graphite and to elaborate new protective formulations. The graphite in this study is aeronautics applications. The AOP consists of an aluminophosphate solution impregnated into the porosity of the graphite to protect the entire volume. This protection seals the porosity and limits access to the active sites of the graphite. The industrial impregnation process was replicated in the laboratory, allowing a comparison of the behavior of AOP within the porosity and in a crucible (using XRD and NMR). The effect of the thermal treatment, humidity, the P/Al ratio, and porosity on its thermal evolution was investigated. The impregnated graphite pieces are regularly exposed to degradation under hydrothermal conditions. Therefore, a stable phase was stabilized within the porosity by varying the P/Al ratio of the solution. New formulations of AOP, in which a portion of the aluminum was substituted with different cations, were also tested and their performance compared with a solution of pure aluminophosphates. The new formulations did not lead to an improvement in anti-oxidation protection but provided insights into the behavior of the aluminophosphate solution within a crucible and the porosity

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Livros sobre o assunto "Anti-Oxidation":

International Conference on the Microscopy of Oxidation (4th 1999 Cambridge, England). Microscopy of oxidation: Proceedings of the Fourth International Conference on the Microscopy of Oxidation, Trinity Hall, Cambridge, 20-22 September 1999. [U.K.]: Science Reviews, 2000.

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International Conference on the Microscopy of Oxidation (3rd 1996 Cambridge, England). Microscopy of oxidation 3: Proceedings of the Third International Conference on the Microscopy of Oxidation, held at Trinity Hall, the University of Cambridge, 16-18 September 1996. London: Institute of Materials, 1997.

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George C. Marshall Space Flight Center., ed. The corrosion protection of aluminum by various anodizing treatments. [Marshall Space Flight Center, Ala.?]: National Aeronautics and Space Administration, George C. Marshall Space Flight Center, 1989.

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Young, D. J. High temperature oxidation and corrosion of metals. Amsterdam: Elsevier, 2008.

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Wang, Hongbin. Wei hu yang hua ji shu ji qi zai hai yang huan jing zhong de ying yong: Microarc oxidation technology and its applications in sea environments. 8^a ed. Beijing: Guo fang gong ye chu ban she, 2010.

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Grishina, E. P. Electrochemical oxidation and corrosion of metals. Hauppauge, N.Y: Nova Science Publishers, 2010.

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Grishina, E. P. Electrochemical oxidation and corrosion of metals. Hauppauge, N.Y: Nova Science Publishers, 2010.

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Grishina, E. P. Electrochemical oxidation and corrosion of metals. New York: Nova Science Publishers, 2010.

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Kong, Ah-Ng Tony. Inflammation, oxidative stress, and cancer: Dietary approaches for cancer prevention. Boca Raton: Taylor & Francis, 2014.

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Shi, Dongsheng. Zao yin bao lu lao gong kang yang hua neng li yu huan jing yin zi dui zao yin yin qi de ting jue ying xiang =: Anti-oxidation capability and environmental factors for noise-induced hearing loss. 8^a ed. Taibei Xian Xizhi Shi: Xing zheng yuan lao gong wei yuan hui lao gong an quan wei sheng yan jiu suo, 2007.

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Capítulos de livros sobre o assunto "Anti-Oxidation":

Yang, Shaohua, Fengli Yang, Lin Wu, Mingzhou Li, Xianwei Hu, Zhaowen Wang, Zhongning Shi e Bingliang Gao. "Aluminum Electrolysis Anti-Oxidation Coating Carbon Anode". In Light Metals 2012, 1307–9. Cham: Springer International Publishing, 2012. http://dx.doi.org/10.1007/978-3-319-48179-1_226.

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Yang, Shaohua, Fengli Yang, Lin Wu, Mingzhou Li, Xianwei Hu, Zhaowen Wang, Zhongning Shi e Bingliang Gao. "Aluminum Electrolysis Anti-Oxidation Coating Carbon Anode". In Light Metals 2012, 1307–9. Hoboken, NJ, USA: John Wiley & Sons, Inc., 2012. http://dx.doi.org/10.1002/9781118359259.ch226.

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Cao, Xiao Zhou, Zhu Xian Qiu, Zhong Ning Shi, Xian Wei Hu, Yun Gang Ban e Zhao Wen Wang. "Anti-Oxidation and Anti-Corrosion Properties of Al-Si Metal Anodes". In Materials Science Forum, 1149–52. Stafa: Trans Tech Publications Ltd., 2007. http://dx.doi.org/10.4028/0-87849-432-4.1149.

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Chen, Huasheng, Huazhi Gu, Kai Lei, Xilai Chen, Mingsheng He e Gaifeng Xue. "Study on Modification of Anti-oxidation Coating for Steel Billet". In Characterization of Minerals, Metals, and Materials 2014, 209–15. Hoboken, NJ, USA: John Wiley & Sons, Inc., 2014. http://dx.doi.org/10.1002/9781118888056.ch25.

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Kovalsky, B. I., N. N. Lysyannikova e E. G. Kravcova. "Influence of Oxidation Products on Anti-wear Properties of Lubricants". In Lecture Notes in Mechanical Engineering, 1215–23. Cham: Springer International Publishing, 2019. http://dx.doi.org/10.1007/978-3-030-22041-9_126.

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Dessouky, Samer, e Manuel Diaz. "Improving Asphalt Mixtures Performance by Mitigating Oxidation Using Anti-Oxidants Additives". In TMS Middle East - Mediterranean Materials Congress on Energy and Infrastructure Systems (MEMA 2015), 45–54. Hoboken, NJ, USA: John Wiley & Sons, Inc., 2015. http://dx.doi.org/10.1002/9781119090427.ch5.

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Naderi, Gholam Ali, Seddigheh Asgary, Gholam Nizal Sarraf-Zadegan e Hamid Shirvany. "Anti-oxidant effect of flavonoids on the susceptibility of LDL oxidation". In Vascular Biochemistry, 193–96. Boston, MA: Springer US, 2003. http://dx.doi.org/10.1007/978-1-4615-0298-2_27.

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Dessouky, Samer, e Manuel Diaz. "Improving Asphalt Mixtures Performance by Mitigating Oxidation Using Anti-Oxidants Additives". In Proceedings of the TMS Middle East — Mediterranean Materials Congress on Energy and Infrastructure Systems (MEMA 2015), 45–54. Cham: Springer International Publishing, 2015. http://dx.doi.org/10.1007/978-3-319-48766-3_5.

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Jeon, Jae Ho, Hai Tao Fang, Zhong Hong Lai e Zhong Da Yin. "Development of Functionally Graded Anti-Oxidation Coatings for Carbon/Carbon Composites". In High-Performance Ceramics III, 1851–56. Stafa: Trans Tech Publications Ltd., 2007. http://dx.doi.org/10.4028/0-87849-959-8.1851.

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Lai, Zhong Hong, Jae Ho Jeon, Jing Chuan Zhu e Zhong Da Yin. "Mo-Si-C-N Multi-Layer Anti-Oxidation Coating on C/C Composites". In Key Engineering Materials, 1899–902. Stafa: Trans Tech Publications Ltd., 2007. http://dx.doi.org/10.4028/0-87849-456-1.1899.

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Trabalhos de conferências sobre o assunto "Anti-Oxidation":

Cheng-Bai, Men, Wu Mei-Fu e Zhou Hong-Li. "EXTRACTION AND ANTI-OXIDATION ACTIVITY OF POLYSACCHARIDES FROM LENTINAN". In International Conference on New Materials and Intelligent Manufacturing (ICNMIM). Volkson Press, 2018. http://dx.doi.org/10.26480/icnmim.01.2018.315.318.

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Lee, Ning-Cheng. "Is it Really Impossible? Combining Superior Anti-Oxidation and Superior Print". In 2008 10th Electronics Packaging Technology Conference (EPTC). IEEE, 2008. http://dx.doi.org/10.1109/eptc.2008.4763494.

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Yan, Li, e Li Jing. "Studies on anti-oxidation effects of alcohol extract of Juglans Mandshurica leaves". In 2011 International Conference on Human Health and Biomedical Engineering (HHBE). IEEE, 2011. http://dx.doi.org/10.1109/hhbe.2011.6028032.

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Xiang, Yang, Si Zhou, Lu Yi e Beizhi Sun. "Anti-oxidation behavior of SiO2/ZrO2-SiO2 composites prepared by Sol-Gel". In 2018 3rd International Conference on Automation, Mechanical Control and Computational Engineering (AMCCE 2018). Paris, France: Atlantis Press, 2018. http://dx.doi.org/10.2991/amcce-18.2018.106.

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Yu, Xiaobai, Xiaoxin Wang, Qinglin Zhang e Jifeng Liu. "Anti-oxidation high-performance solution-processed Ni plasmonic nanochain-SiOxselective solar thermal absorbers". In SPIE Solar Energy + Technology, editado por Adam P. Plesniak e Candace Pfefferkorn. SPIE, 2014. http://dx.doi.org/10.1117/12.2059049.

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Chen, Peixin, Hongqi Sun, Mengya Dong, Tao Hang, Yunwen Wu e Ming Li. "Anti-oxidation property of nanotwinned copper micro-cone array for low-temperature bonding". In 2023 24th International Conference on Electronic Packaging Technology (ICEPT). IEEE, 2023. http://dx.doi.org/10.1109/icept59018.2023.10492180.

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Kong, Lingyan, Yang Yang, Jiqiang Wang, Qing Jia, Lei Xu, Tianying Xiong e Xin Yue. "Preparation of Inorganic Phosphate Ceramic Coatings on γ-TiAl Based Alloys". In ITSC2015, editado por A. Agarwal, G. Bolelli, A. Concustell, Y. C. Lau, A. McDonald, F. L. Toma, E. Turunen e C. A. Widener. ASM International, 2015. http://dx.doi.org/10.31399/asm.cp.itsc2015p0150.

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Abstract In this paper, we reported our investigation on preparing inorganic phosphate ceramic coatings on the surface of γ-TiAl based alloy by air spray. The high temperature performance of the coatings was tested by thermal shock test, cyclic oxidation and isothermal oxidation at 950 °C. The results showed that the coatings exhibited significant improvement on high temperature anti-oxidation performance of the base alloy. No obvious cracks or spalling of the coatings occurred after oxidation experiment under isothermal oxidation condition at at 950 °C for 1000 h. The characterization was carried out to analyze the microstructure of the coatings before and after oxidation test.

Homma, Soichiro, e Mamoru Hashimoto. "Label free isomeric metabolism measurement with multiplex coherent anti-Stokes Raman scattering microspectroscopy". In Conference on Lasers and Electro-Optics/Pacific Rim. Washington, D.C.: Optica Publishing Group, 2022. http://dx.doi.org/10.1364/cleopr.2022.p_cm15_02.

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We observed beta-oxidation of trans-fatty acid for human hepatocarcinoma cell line HepG2 with multiplex coherent anti-Stokes Raman scattering microspectroscopy under time-series and found the isomerization of unsaturated fatty acid without staining.

Yang, Chun An, C. Robert Kao, Hiroshi Nishikawa e Chin C. Lee. "High Reliability Sintered Silver-Indium Bonding with Anti-Oxidation Property for High Temperature Applications". In 2018 IEEE 68th Electronic Components and Technology Conference (ECTC). IEEE, 2018. http://dx.doi.org/10.1109/ectc.2018.00299.

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Wolf, Andreas, Alexandra Walczak, Sebastian Mack, Edga Wotke, Anke Lemke, Christoph Bertram, Udo Belledin, Daniel Biro e Ralf Preu. "The SiNTO process: Utilizing a SiNx anti-reflection layer for emitter masking during Thermal Oxidation". In 2009 34th IEEE Photovoltaic Specialists Conference (PVSC). IEEE, 2009. http://dx.doi.org/10.1109/pvsc.2009.5411627.

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Relatórios de organizações sobre o assunto "Anti-Oxidation":

I. A. Parshikov, Igor A. OXIDATION OF GERANYL-N-PHENYLCARBAMATE BY FUNGUS BEAUVERIA BASSIANA WITH AIM TO OBTANING OF NEW ANTI-CANCER DRUGS. Intellectual Archive, outubro de 2020. http://dx.doi.org/10.32370/iaj.2427.

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The microbial oxidation of geranyl-N-phenylcarbamate by fungus Beauveria bassiana was investigated. Oxidation of the C3 – C4 double bond of the parent molecule leads to regioselective formation of O-3,4-epoxyheranyl-N-phenylcarbamate in 30 % yield

Handa, Avtar K., Yuval Eshdat, Avichai Perl, Bruce A. Watkins, Doron Holland e David Levy. Enhancing Quality Attributes of Potato and Tomato by Modifying and Controlling their Oxidative Stress Outcome. United States Department of Agriculture, maio de 2004. http://dx.doi.org/10.32747/2004.7586532.bard.

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General The final goal and overall objective of the current research has been to modify lipid hydroperoxidation in order to create desirable phenotypes in two important crops, potato and tomato, which normally are exposed to abiotic stress associated with such oxidation. The specific original objectives were: (i) the roles of lipoxygenase (LOX) and phospholipids hydroperoxide glutathione peroxidase (PHGPx) in regulating endogenous levels of lipid peroxidation in plant tissues; (ii) the effect of modified lipid peroxidation on fruit ripening, tuber quality, crop productivity and abiotic stress tolerance; (iii) the effect of simultaneous reduction of LOX and increase of PHGPx activities on fruit ripening and tuber quality; and (iv) the role of lipid peroxidation on expression of specific genes. We proposed to accomplish the research goal by genetic engineering of the metabolic activities of LOX and PHGPx using regulatable and tissue specific promoters, and study of the relationships between these two consecutive enzymes in the metabolism and catabolism of phospholipids hydroperoxides. USA Significant progress was made in accomplishing all objectives of proposed research. Due to inability to regenerate tomato plants after transforming with 35S-PHGPx chimeric gene construct, the role of low catalase induced oxidative stress instead of PHGPx was evaluated on agronomical performance of tomato plant and fruit quality attributes. Effects of polyamine, that protects DNA from oxidative stress, were also evaluated. The transgenic plants under expressing lipoxygenase (LOX-sup) were crossed with catalase antisense (CAT-anti) plants or polyamine over producing plants (SAM-over) and the lines homozygous for the two transgenes were selected. Agronomical performance of these line showed that low catalase induced oxidative stress negatively affected growth and development of tomato plants and resulted in a massive change in fruit gene expression. These effects of low catalase activity induced oxidative stress, including the massive shift in gene expression, were greatly overcome by the low lipoxygenase activity. Collectively results show that oxidative stress plays significant role in plant growth including the fruit growth. These results also for the first time indicated that a crosstalk between oxidative stress and lipoxygenase regulated processes determine the outcome during plant growth and development. Israel Regarding PHGPx, most of the study has concentrated on the first and the last specific objectives, since it became evident that plant transformation with this gene is not obvious. Following inability to achieve efficient transformation of potato and tomato using a variety of promoters, model plant systems (tobacco and potato cell cultures, tobacco calli and plantlets, and Arabidopsis) were used to establish the factors and to study the obstacles which prohibited the regeneration of plants carrying the genetic machinery for overproduction of PHGPx. Our results clearly demonstrate that while genetic transformation and over-expression of PHGPx occurs in pre-developmental tissue stage (cell culture, calli clusters) or in completed plant (Arabidopsis), it is likely that over-expression of this enzyme before tissue differentiation is leading to a halt of the regeneration process. To support this assumption, experiments, in which genetic engineering of a point-mutated PHGPx gene enable transformation and over-expression in plants of PhSPY modified in its catalytic site and thus inactive enzymatically, were successfully carried out. These combined results strongly suggest, that if in fact, like in animals and as we established in vitro, the plant PHGPx exhibits PH peroxidase activity, these peroxides are vital for the organisms developmental process.