Bibliografias temáticas / Aluminia

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Literatura científica selecionada sobre o tema "Aluminia"

Autor: Grafiati
Publicado: 4 de junho de 2021
Última modificação: 5 de fevereiro de 2022

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Artigos de revistas sobre o assunto "Aluminia"

1

Feng, Chun Xia, Jing Hua Chen, Wei Guo, Bao Xiang Jiao e Hong Bin Lu. "Aluminium Titanate-Aluminia Composites Synthesized by Heterogeneous Precipitation Method". Applied Mechanics and Materials 217-219 (novembro de 2012): 3–7. http://dx.doi.org/10.4028/www.scientific.net/amm.217-219.3.

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Aluminium titanate-alumina (AT-A) composites were sintered from the precursor powders prepared by two different methods: a simple sol-gel based heterogeneous precipitation method and a traditional blending method. The crystalline phase, microstructure, mechanical strength, sintering properties, and thermal expansion coefficient (TEC) of the sintered AT-A composites were investigated and compared. The heterogeneous precipitation method increases the homogeneity of the precursor powders and improves the mechanical and sintering properties of the AT-A composites. The AT-A composites with a Al:Ti ratio of 2.2 achieve the optimal performance where the bending strength is high and the TEC remains low.
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Wang, Miao, Yan Xia Guo, Fang Qin Cheng e Yao Yao Li. "A Study on the Mechanism of Aluminia Extraction from Coal Fly Ash". Advanced Materials Research 518-523 (maio de 2012): 3109–14. http://dx.doi.org/10.4028/www.scientific.net/amr.518-523.3109.

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Coal fly ash contains large amounts of aluminum, iron, silicon and other useful elements. Its utilization effectively is of significance to harmonious development of economy, society and environment. However, coal fly ash is mainly composed of mullite and other inert glassy matters with high degree of polymerization and its reactivity is poor. So the fly ash needs to be activated before utilization. This article studied the effect of activation by calcination added with NaOH additives on aluminium extraction. The results showed that the addition of NaOH could improve the aluminium extraction rate evidently. Detailed analysis and characterization was carried out by using X-ray diffraction (XRD). The results indicated that NaOH could improve the depolymerization of vitreous.
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3

Krampera, František, e Ludvík Beránek. "Kinetics of 1-butanol, di-(1-butyl) ether and 1-butene reactions on aluminas partially deactivated by sodium". Collection of Czechoslovak Chemical Communications 54, n.º 11 (1989): 2985–97. http://dx.doi.org/10.1135/cccc19892985.

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The initial rates of six reactions taking place in 1-butanol dehydration at 260 °C in vapour phase were measured on aluminia samples differing in sodium content. The reactants were 1-butanol, di-(1-butyl) ether and 1-butene, resp. The parameters of the best fitting rate equation for each reaction were evaluated. The reaction rates as well as the rate constants and adsorption coefficients of the individual reactions show different sensitivity to datalyst acidity. Therefore, the selectivity of product formation can be influenced by sodium content of the catalyst. The selectivities (with the exception of 1-butene izomerization) strongly depend also on the partial pressure of the starting reactants. Thus, these two factors can be used to control the selectivity for preparative purposes. The results of this paper clearly demonstrate the nonseparability of the deactivation kinetics in 1-butanol dehydration on sodium poisoned aluminas.
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Zun, Ro Yong, Helena Davidová, Jaroslava Polednová, Květa Jirátová e Petr Schneider. "Properties of supported rhodium catalysts for steam dealkylation of toluene". Collection of Czechoslovak Chemical Communications 53, n.º 3 (1988): 466–78. http://dx.doi.org/10.1135/cccc19880466.

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The effect of modification of γ-aluminia support by Cr2O3 on physical and catalytical properties of supported rhodium catalysts was investigated. Various techniques were used for characterization of catalysts: porosimetry, diffusion and permeation measurements, determination of surface OH groups, temperature-programmed reduction and catalytic behaviour in steam dealkylation of toluene. Using the transport parameters determined for pelleted catalysts the effect of internal diffusion on the reaction was predicted and compared with experiments.
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Davidová, Helena, e Petr Schneider. "Elimination of dead-volume contributions to moments of chromatographic peaks". Collection of Czechoslovak Chemical Communications 54, n.º 11 (1989): 2974–84. http://dx.doi.org/10.1135/cccc19892974.

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two methods for correction of moments of peaks from packed columns were applied to experimental responses of columns packed with porous γ-aluminia in the shape of Rasching rings: 1. substraction of moments for columns of two lengths and 2. application of dead volume corrections obtained by independent measurements. It appears that both methods give identical results. An advantage of the second methods lies in increased accuracy and decreased amount of necessary measurements.
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Kočan, Anton, Alexandr Zemek e Milan Popl. "Determination of 2,3,7,8-tetrachlorodibenzo-p-dioxin in soil in the presence of large excess of chlorinated hydrocarbons". Collection of Czechoslovak Chemical Communications 56, n.º 6 (1991): 1221–27. http://dx.doi.org/10.1135/cccc19911221.

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The paper describes a method of 2,3,7,8-TCDD determination in soils heavily contaminated with organic compounds ( the soil from areas of plants producing pesticides, chlorophenols, etc.). The procedure is based on a sample extraction with a hexane-acetone mixture, cleaning of the extract by washing with potassium hydroxide and sulfuric acid solution and by liquid chromatography on a multilayer modified silica column and aluminia columns, and on GC/MS determination using a labelled internal standard (13C-2,3,7,8-TCDD). The determination limit is 10 ppt and the average recovery 55%.
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Morávek, Vladimír, Miloš Kraus, L. V. Malysheva, E. A. Paukshtis e E. N. Yurchenko. "IR study of dynamic bahaviour of 2-propanol on alumina". Collection of Czechoslovak Chemical Communications 53, n.º 3 (1988): 459–65. http://dx.doi.org/10.1135/cccc19880459.

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Dynamic behavior of surface complexes of 2-propanol on aluminia during adsorption and dehydration was studied using IR spectroscopy. Good agreement was found between the first-order rate constants of alkene formation in pulse-flow experiments and that of disapearance of a reactive surface complex. It was shown that the simple surface alkoxide 2-Pr-O-Al remains on the surface constant temperature, but it can be completely removed by hydrolysis, or by heating up to 200 °C. The surface carboxylates are formed very slowly and are stable even in the presence of water vapour at 300 °C.
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Hanika, Jiří, e Vladimíra Ehlová. "Effect of internal diffusion on kinetics of liquid phase hydrogenation and disproportionation of the cyclohexene on palladium catalysts". Collection of Czechoslovak Chemical Communications 54, n.º 11 (1989): 3003–10. http://dx.doi.org/10.1135/cccc19893003.

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Kinetics of the side reactions represented by the system involving hydrogenation and disproportionation of cyclohexene on a commercial catalyst CHEROX 41-00 (3%Pd/C) and on a supported palladium catalyst prepared by impregnation of aluminia with aqueous palladium dichloride (2.15% Pd/γ-Al2O3) have been investigated. As follows from the effectiveness factors of internal diffusion for individual reactions, in the region of internal diffusion, cyclohexene hydrogenation is preferred compared to disproportionation. This finding can be related to the fact that while the rate of disproportionation is controlled by cyclohexene diffusion, the rate of hydrogenation is controlled by diffusion of hydrogen.
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Chen, Ting Yi, Wen Lu, Wei Liu, Ya Dian Xie e Ye Qi Fu. "Preparation of Purity Al2O3 for LED Sapphire Materials by Ammonium Aluminum Sulfate and its Performance". Advanced Materials Research 1053 (outubro de 2014): 50–55. http://dx.doi.org/10.4028/www.scientific.net/amr.1053.50.

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The preparation of aluminium sulfate adopting the sulfuric acid heating method with Al (OH)3 as raw material, and join the β complexing agent in aluminium sulfate solution to remove impurities; ammonium aluminum sulfat is prepared by the reaction of the ammonium solution and aluminum sulfate, and purify ammonium aluminum sulfate to get high purity ammonium aluminum sulfate crystals containing crystal water. Purify the crystallization of ammonium aluminum sulfate with containing water treated at 1250 °C for 3 h. Then the high purity alumina was prepared. Break the high purity alumina to press, and then again process in 3 h under 1650 °C, get Al203 which is craw materials of sapphire crystal LED. The samples were characterized by atomic absorption spectrum (AAS), differential thermal analysis (TG/DTA), scanning electron microscopy, XRD and chemical analysis. The purity of high purity alumina is 99.991%, which will be applied to the LED manufacturers on sapphire artificial sapphire growth test.
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El, Ezzat A., Samih A. Halawy, Mohamed A. Mohamed e Mohamed I. Zaki. "Surface and Bulk Properties of Alumina Recovered Under Various Conditions from Aluminum Dross Tailings Chemical Waste Versus Bauxite Ore". Journal of Materials Research 17, n.º 7 (julho de 2002): 1721–28. http://dx.doi.org/10.1557/jmr.2002.0255.

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Bauxite ore (industrial raw material) and aluminum dross tailings (a local industrial waste material of the Aluminium Company of Egypt, Egyptalum) were used as two different parent materials to produce alumina. A set of six different preparation methods was applied to aluminum extracts from both materials. X-ray powder diffractometry, thermal and chemical analyses, and surface area and charge measurements were used to characterize the alumina products. The results indicate that catalytic grade, high-purity alumina products of uniform particle sizes could be obtained in large yields, depending solely on the preparation method applied, i.e., irrespective of the raw material used. Thus, aluminum dross tailings chemical waste is proved to be a feasible parent material for specialty alumina, which is an important finding both economically and environmentally.
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Mais fontes

Teses / dissertações sobre o assunto "Aluminia"

1

Alkebro, Jesper. "Multiphase oxide ceramics in the aluminia-yttria system". Vandoeuvre-les-Nancy, INPL, 2002. http://www.theses.fr/2002INPL109N.

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Dans l'objectif de créer des structures d'oxydes multiphasées, le broyage à haute énergie a servi comme pré-traitement aux mélanges de poudres alumine-yttrine avant pressage et frittage. Le travail initial de modélisation du broyage planétaire a été suivi par une étude de l'évolution de phases et le frittage au cours des traitements thermiques des poudres broyées. Le broyage menait à la destruction du réseau cristallin et, dans certains cas, la formation d'une phase perovskite Y AIO3. Au traitement thermique suivant, les températures de transformation ont diminué en fonction du temps de broyage et le futtage a été amélioré, produisant des densités relatives aussi élevées que 96 pour cent après frittage sous argon 1 h à 1500 degrés C. La dispersion d'une deuxième phase dans une matrice de la phase dominant a été observée après le frittage. La taille de grains a pu être estimé à 5 micron à partir des surfaces de rupture
As a means of creating dispersed multiphase oxide structures, high-energy milling bas been used for pre-treating alumina-yttria powder mixtures before pressing and sintering. Initial modeling of planetary ball-milling was followed by a study of phase development and sintering of the milled Dowders. Milling injected defects into the crystal structures which were gradually destroyed and in some cases yttrium alumnium perovsklte was formed, an intermediate phase of the alumma-yttria system. Ln heat treatment, transformation temperatures fell as a function of milling time and sintering properties were also improved giving relative densities as high as 96 per cent after sintering 1 h in 1500 degrees C. A dispersion of a second phase in the dominant matrix phase was observed but further improvement of the process should be needed to make it finer. The grain size could be estimated to be around 5 microns from fracture surface images
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Ergin, Guvenc. "Étude de la mouillabilité des particules granulaires par les alliages d'aluminium durant la filtration d'aluminium /". Thèse, Chicoutimi : Université du Québec à Chicoutimi, 2006. http://theses.uqac.ca.

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Thèse (D.Eng.) -- Université du Québec à Chicoutimi, 2006.
La p. de t. porte en outre: Thèse présentée à l'Université du Québec à Chicoutimi pour l'obtention du doctorat en ingénierie. CaQCU Bibliogr.: f. 130-147. Document électronique également accessible en format PDF. CaQCU
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Pelzer, Katrin. "Ruthenium nanoparticles synthesis, characterisation and organisation in aluminia membranes and mesoporous materials ; applications in catalysis /". [S.l. : s.n.], 2003. http://deposit.ddb.de/cgi-bin/dokserv?idn=971183279.

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4

Suarez, Jimmy. "Modélisation de la combustion diphasique de l’aluminium et application sur la post-combustion d'une charge explosive condensée dans l'air". Thesis, Toulouse, INPT, 2020. http://www.theses.fr/2020INPT0099.

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La combustion de l'aluminium est un phénomène présent dans de nombreux domaines, tels que le domaine du spatial, de la défense et de l'automobile. Une fois allumée, une particule d'aluminium représente un excellent vecteur d'énergie pour l'écoulement environnant grâce à sa grande densité énergétique. Sa combustion avec l'air, ou avec d'autres oxydants, a fait l'objet de quelques études expérimentale et numérique, ce qui a mis en avant l'une des particularités de cette combustion diphasique. Lors de la combustion de l'aluminium, elle produit une espèce appelée alumine qui existe uniquement en phase liquide dans ses gaz brûlés. Cette particularité rend la modélisation de la combustion diphasique de l'aluminium complexe à modéliser. L'objectif de cette thèse est divisé en deux parties. La première partie est de développer un modèle de combustion diphasique de l'aluminium avec l'air. Cette modélisation est une simulation Euler- Lagrange réalisée avec AVBP, qui est un code de simulation mis en place par le CERFACS. Elle prend en compte la combustion rapide de l'aluminium en phase gazeuse et les changements de phase qui interviennent comme la fusion et l'évaporation de l'aluminium, mais aussi la condensation et la solidification de l'alumine. Une méthode de germination est développée pour permettre la condensation de l'alumine dans les gaz brûlés et suivre de façon lagrangienne sa croissance derrière la flamme aluminium-air. Cette modélisation nous a permis de simuler des flammes aluminium-air 1D et 2D pour les comparer aux données expérimentales trouvées dans la littérature. La seconde partie de cette thèse est l'analyse de la dispersion et de la participation énergétique de l'aluminium dans la post-combustion d'une charge explosive. Le phénomène de post-combustion est très lumineux et rapide, ce qui empêche expérimentalement de connaître l'évolution de l'état des particules d'aluminium contenues initialement dans la charge explosive. Ces simulations permettent de suivre la dispersion des particules et leurs interactions avec les différentes phases qui composent la post-combustion. Un modèle de combustion de particule isolée est repris de la littérature et adapté à notre cas d'étude. Ainsi l'influence de la présence physique des particules et de la chaleur dégagée par leur combustion a pu être évaluée sur l'évolution de la boule de feu et la propagation du choc secondaire. L'ensemble de ces travaux de thèse, que ce soit pour la modélisation de la flamme aluminium-air et l'analyse de l'impact de l'aluminium sur la post-combustion, a montré des résultats convaincants par rapport aux données de la littérature. Les modèles numériques utilisés et développés sont prometteurs pour des futures études sur la combustion de l’aluminium
The combustion of aluminum is a phenomenon present in many fields, such as the space, defense and automotive fields. Once ignited, an aluminum particle represents an excellent energy carrier for the surrounding flow with its high energy density. Its combustion with air, or with other oxidants, has been the subject of some experimental and numerical studies, which has highlighted one of the particularities of this two-phase combustion. During the aluminum combustion, it produces a species called alumina which exists only in the liquid phase in its burning gases. This particularity makes the modeling of the two-phase combustion of aluminum complex to model. The objective of this thesis is divided into two parts. The first part is to develop a model of two-phase combustion of aluminum with air. This modeling is an Euler-Lagrange simulation created with AVBP, which is a simulation code implemented by CERFACS. It takes into account the rapid combustion of aluminum in the gaseous phase and the phase changes that occur such as the melting and evaporation of aluminum, but also the condensation and solidification of alumina. A germination method is developed to allow the condensation of alumina in the burning gases and to follow its growth in a Lagrangian way behind the aluminum-air flame. This modeling allowed us to simulate 1D and 2D aluminum-air flames to compare them to the experimental data found in the literature. The second part of this thesis is the analysis of the dispersion and the energetic participation of aluminum in the post-combustion of an explosive charge. The phenomenon of post-combustion is very bright and rapid, which experimentally prevents knowing the evolution of the state of the aluminum particles initially contained in the explosive charge. These simulations make it possible to follow the dispersion of the particles and their interactions with the different phases that make up the post-combustion. An isolated particle combustion model is taken from the literature and adapted to our case study. Thus the influence of the physical presence of particles and of the heat released by their combustion could be evaluated on the evolution of the fireball and the propagation of the secondary shock. All of this thesis work, whether for the modeling of the aluminum-air flame and the analysis of the impact of aluminum on the post-combustion, showed convincing results compared to the data of the literature. The numerical models used and developed are promising for future studies on the combustion of aluminum
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Souza, Fabiana de. "Extração e caracterização de ácido húmico do carvão candiota e avaliação reológica do seu uso como defloculante em uma suspensão de aluminia". reponame:Biblioteca Digital de Teses e Dissertações da UFRGS, 2017. http://hdl.handle.net/10183/171400.

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O carvão mineral Candiota tem elevado teor de cinzas e baixo rank, portanto não apresenta aplicação na metalurgia e sua utilização fica destinada à geração de energia. No entanto, carvões sub-betuminosos apresentam grande potencial de utilização na extração de ácidos húmicos (AH), cuja pesquisa se intensificou nas últimas décadas. No presente trabalho o carvão Candiota foi utilizado para extração alcalina de ácido húmico, o qual foi caracterizado de acordo com suas propriedades físico-químicas e superficiais. Os AHs são moléculas orgânicas de alto peso molecular e possuem atributos de polieletrólito. A caracterização do AH em pH alcalino mostrou grande quantidade de carga superficial negativa e baixa turbidez em suspensão. O AH apresentou a melhor condição para atuação como defloculante pelo mecanismo eletroestérico, devido à conformação estendida de sua molécula em pH alcalino, contrastando com a forma aglomerada em pH ácido, como comprovado pela análise microestrutural em MEV. A avaliação do AH como defloculante foi realizada em suspensão de alumina (60 % em massa). A quantidade ótima de AH foi determinada na curva de defloculação (viscosidade em função da concentração de defloculante), de modo que a adição de 0,016 % de AH (em pH 11) foi suficiente para obtenção de viscosidade baixa e adequada para os estudos reológicos. Nas curvas de fluxo e de viscosidade, a suspensão defloculada com AH mostrou comportamento pseudoplástico e levemente tixotrópico. O comportamento reológico em cisalhamento constante foi considerado adequado para baixas taxas de cisalhamento, e as propriedades da suspensão em repouso mostraram uma excelente estabilidade coloidal. De maneira geral, o comportamento do AH na defloculação foi similar ao do defloculante comercial poliacrilato de sódio utilizado no presente estudo a fim de se comparar os dados obtidos. Ambos defloculantes apresentaram efetiva redução e estabilização da viscosidade da suspensão. Os resultados sugerem uma barbotina adequada para processamento por colagem com características similares às utilizadas industrialmente. Como comprovação, foi realizada a colagem em molde de gesso. Após sinterização a 1600°C, a peça obtida não apresentou falhas visíveis, e a caracterização tecnológica mostrou que a dispersão e estabilização da suspensão promoveram uma microestrutura homogênea e com alta densificação (98,7 % do valor teórico).
The Candiota coal is a low rank and high ash content material, so it does not present application in metallurgy and its use is destined to the generation of energy. However, sub-bituminous coal present great potential for the use in humic acid extraction (HA), whose research was intensified in the last decades. In the present work the Candiota coal was used as raw-material for alkaline extraction of humic acid, which was characterized according to its physicochemical and superficial properties. AHs are organic molecules of high molecular weight and attributes of polyelectrolyte. The characterization of HA at alkaline pH showed large amount of negative surface charges and low turbidity in suspension. The HA presented the best condition for deflocculation of ceramics suspensions by the electroesteric mechanism, due to the extended configuration of its molecule at alkaline pH, in contrast to the agglomerated form at acidic pH, as evidenced by microstructural analysis in SEM. The evaluation of HA as a deflocculant was performed in alumina suspensions (60 % by weight). The optimal amount of HA was determined in the deflocculation curve (viscosity x deflocculant concentration), so that the addition of 0.016 % HA (at pH 11) was sufficient to obtain low and suitable viscosity for the rheological studies. In the flow and viscosity curves, the suspension deflocculated with HA showed a pseudoplastic and slightly thixotropic behavior. The rheological behavior at constant shear was considered suitable for low shear rates and the properties of the slurry at rest showed an excellent colloidal stability. In general, the behavior of the HA on deflocculation was similar to the commercial deflocculant sodium polyacrylate, used in the present study in order to compare the obtained data. Both deflocculants presented effective reduction and stabilization of the suspension viscosity. The results suggest that the slurry is suitable for processing by slip casting method with characteristics similar to industrially processed slurries. After sintering at 1600 °C, the cast piece showed no visible defects, and the technological characterization showed that the dispersion and stabilization of the suspension promoted a homogeneous microstructure with high densification (98.7 % of theoretical value).
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Roselló, Serra Maite. "Estrategias de resistencia a aluminio en dos variedades de Oryza Sativa: exclusión vs detoxificación". Doctoral thesis, Universitat Autònoma de Barcelona, 2016. http://hdl.handle.net/10803/399682.

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El arroz (Oryza sativa) es un cultivo altamente tolerante a Al. Entre otros mecanismos, una mayor expresión de los genes STAR1 / STAR2 como también de Nrat1 y ALS1 puede al menos en parte ser responsable de la tolerancia inducible por Al en esta especie. Se analizaron las distintas respuestas a Al en dos variedades de arroz Nipponbare y Modan. Todos los marcadores de toxicidad / tolerancia analizados (crecimiento de la raíz, azul de Evans, tinciones con hematoxilina y morin) indicaron una tolerancia a Al superior en la variedad Nipponbare que en Modan. Nipponbare acumuló mucho menos Al en las raíces que Modan. El suministro de aluminio provocó la expresión más fuerte de STAR1 en Nipponbare que en Modan. En las raíces de Nipponbare se encontró un aumento claramente mayor de la acumulación de ácido abscísico (ABA) inducido por Al que en las raíces de Modan. Se observaron altos niveles de ABA y JA en Nipponbare después de 48 h de exposición a Al. Estos picos coincidieron en el tiempo con el nivel de expresión más alto de STAR1. Se propone que ABA y JA puede ser necesario para la remodulación de la pared celular facilitado por el mayor transporte de UDP-glucosa a las paredes a través del complejo STAR1 / Star2. En contraste, en las raíces de Modan la expresión tanto de NRAT1, que codifica para una membrana plasmática transportadora de Al, como de ALS1, que codifica para un transportador de Al localizado el tonoplasto, mejoraron considerablemente en presencia de Al. Por otra parte, Modan tenía una mayor expresión de ASR1 inducido por Al, un gen que se ha propuesto para codificar una proteína que actúa como secuestrador de oxígeno reactivo. En conclusión, la estrategia de exclusión de Al de Nipponbare, mediada al menos en parte por STAR1 y probablemente regulada por ABA, produjo una mejor protección contra la toxicidad de Al que la estrategia de acumulación y desintoxicación interna de Modan mediada por NRAT1, ALS1 y ARS1.
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Nafisi, Shahrooz. "Effects of grain refining and modification on the microstructural evolution of semi-solid 356 alloy = Effets de l'affinage des grains et de la modification sur l'évolution microstructurale de l'alliage 356 semi-solide /". Thèse, Chicoutimi : Université du Québec à Chicoutimi, 2006. http://theses.uqac.ca.

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Laserna, Ayora Victor. "Small Molecule Activation for the Formation of Heterocyclic Compounds". Doctoral thesis, Universitat Rovira i Virgili, 2017. http://hdl.handle.net/10803/457704.

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La tesi se centra en l'activitat dels aminotrifenolatos d'alumini en l'activació de epòxids i la seva posterior acoblament a altres molècules en la formació de diferents heterocicles. El catalitzador és un àcid de Lewis que en interaccionar amb el epòxid augmenta la electrofilia d'aquest, afavorint processos d'obertura de cicle i acoblament a heterocumulenos com el CO2 o el SO2. Hem aconseguit descriure metodologies per a la síntesi de oxazolidinones, carbamats, sulfits cíclics o carbonats cíclics. Molts d'aquests processos ja havien estat descrits amb anterioritat per epòxids terminals, per això nosaltres ens hem centrat en epòxids cíclics la reactivitat és menor ia més els seus productes són més interessants en ser més similars a productes naturals. Estudiant els diferents mecanismes relacionats amb aquestes reaccions i variant les condicions i components dels nostres sistemes catalítics hem aconseguit que totes les nostres síntesi siguin estereoselectives i en algun cas fins i tot estereodivergente.
La tesis se centra en la actividad de los aminotrifenolatos de aluminio en la activación de epoxidos y su posterior acoplamiento a otras moleculas en la formación de distintos heterociclos. El catalizador es un acido de Lewis que al interaccionar con el epóxido aumenta la electrofilia de este, favoreciendo procesos de apertura de ciclo y acoplamiento a heterocumulenos como el CO2 o el SO2. Hemos conseguido describir metodologías para la sintesis de oxazolidinonas, carbamatos, sulfitos cíclicos o carbonatos cíclicos. Muchos de estos procesos ya habían sido descritos con anterioridad para epóxidos terminales, por ello nosotros nos hemos centrado en epóxidos cíclicos cuya reactividad es menor y además sus productos son más interesantes al ser mas similares a productos naturales. Estudiando los distintos mecanismos relacionados con estas reacciones y variando las condiciones y componentes de nuestros sistemas catalíticos hemos conseguido que todas nuestras síntesis sean estereoselectivas y en algún caso incluso estereodivergente.
This thesis focuses on the activity of aluminium aminotriphenolates in the activation of epoxides and their couplings to other molecules in the formation of a series of heterocycles. The catalyst is a Lewis Acid which interacts with the epoxide enhancing its electrophilicity, favoring ring opening processes and couplings to heterocumulenes such as CO2 or SO2. We describe methodologies for the synthesis of oxazolidinones, carbamates, cyclic sulfites or cyclic carbonates. Many of these processes had already been described for other catalyst systems, but we have focused on the less reactive cyclic epoxides, whose products are more interesting as they have similarities to many natural products. Studying the different reaction mechanisms related to these reactions and changing the components and conditions of our catalytic system we have achieved complete stereoselectivity in our reactions and even in some cases stereodivergence.
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Saoudi, Abdelhamid. "Prédiction de la rupture par fatigue dans les pièces automobiles en alliages aluminium /". Thèse, Chicoutimi : Université du Québec à Chicoutimi, 2008. http://theses.uqac.ca.

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Thèse (D.Eng.) -- Université du Québec à Chicoutimi, 2008.
La p. de t. porte en outre: Doctorat en ingénierie, thèse pour l'obtention du titre de Philosophiae Doctor en ingénierie. CaQQUQ Comprend des réf. bibliogr. (f. 174-178). Publié aussi en version électronique. CaQQUQ
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Mohamed, Adel. "Effet des additifs sur la microstructure et les propriétés mécaniques des alliages d'aluminium-silicium /". Thèse, Chicoutimi : Université du Québec à Chicoutimi, 2008. http://theses.uqac.ca.

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Thèse (D.Eng..) -- Université du Québec à Chicoutimi, 2008.
La p. de t. porte en outre: Thèse présenté[e] à l'Université du Québec à Chicoutimi comme exigence partielle du doctorat en ingénierie. CaQQUQ Comprend des réf. bibliogr. (f. [292]-314). Publié aussi en version électronique. CaQQUQ
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Livros sobre o assunto "Aluminia"

1

Mikkelsen, Leif Bering. Aluminia fajance, 1862-1969. [Denmark]: Sesam, 2000.

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2

Casati, Riccardo. Aluminum Matrix Composites Reinforced with Alumina Nanoparticles. Cham: Springer International Publishing, 2016. http://dx.doi.org/10.1007/978-3-319-27732-5.

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3

Sheel, Alok. Strategy paper on aluminium tariffs for India. New Delhi: Rajiv Gandhi Institute for Contemporary Studies, 2001.

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4

Sato, Taichi. Preparation and characterization of aluminium hydroxides and aluminas. 2a ed. Pendleton, S.C: Litarvan, 2007.

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Sato, Taichi. Preparation and characterization of aluminium hydroxides and aluminas. 2a ed. Pendleton, S.C: Litarvan, 2007.

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6

Australasian, Asian Pacific Conference on Aluminium Cast House Technology (5th 1997 Gold Coast Qld ). 5th Australasian Asian Pacific Conference on Aluminium Cast House Technology. Warrendale, PA: Minerals, Metals & Materials Society, 1997.

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7

Kotli͡arskiĭ, F. M. Formirovanie otlivok iz ali͡uminievykh splavov. Kiev: Nauk. dumka, 1990.

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8

Amalia, Dessy. Pembuatan alumina metallurgical grade dari larutan sodium aluminat melalui proses pemurnian. Bandung: Puslitbang Teknologi Mineral dan Batubara, Badan Litbang Energi dan Sumber Daya Mineral, Kementerian Energi dan Sumber Daya Mineral, 2011.

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9

Mansfeld, F. Environmentally-induced passivity of aluminum alloys and aluminium metal matrix composites. Los Angeles: University of Southern California, 1990.

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10

Hafley, Johanna L. A comparison of the aging kinetics of a cast alumina-6061 aluminum composite and a monolithic 6061 aluminum alloy. Monterey, Calif: Naval Postgraduate School, 1989.

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Capítulos de livros sobre o assunto "Aluminia"

1

Baker, Ian. "Aluminium/Aluminum". In Fifty Materials That Make the World, 5–9. Cham: Springer International Publishing, 2018. http://dx.doi.org/10.1007/978-3-319-78766-4_2.

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2

Crowson, Phillip. "Aluminium/Bauxite/Alumina". In Minerals Handbook 1992–93, 1–13. London: Palgrave Macmillan UK, 1992. http://dx.doi.org/10.1007/978-1-349-12564-7_1.

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Kaplan, W. D. "Alumina — Aluminium Interfaces". In Interfacial Science in Ceramic Joining, 153–60. Dordrecht: Springer Netherlands, 1998. http://dx.doi.org/10.1007/978-94-017-1917-9_13.

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Crowson, Phillip. "Aluminium/Bauxite/Alumina". In Minerals Handbook 1994–95, 1–13. London: Palgrave Macmillan UK, 1994. http://dx.doi.org/10.1007/978-1-349-13431-1_1.

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Crowson, Phillip. "Aluminium/bauxite/alumina". In Minerals Handbook 1996–97, 1–18. London: Palgrave Macmillan UK, 1996. http://dx.doi.org/10.1007/978-1-349-13793-0_1.

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Contreras, César A., Esthela Ramos, Satoshi Sugita e Juan Serrato. "Aluminum Carbonate as an Alumina Precursor". In Ceramic Transactions Series, 165–76. Hoboken, NJ, USA: John Wiley & Sons, Inc., 2012. http://dx.doi.org/10.1002/9781118380826.ch15.

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Nicolaos, Denaxas, e Zervos Antonios. "Saving Energy in Alumina - Aluminium Plants". In Energy Efficiency in Process Technology, 73–88. Dordrecht: Springer Netherlands, 1993. http://dx.doi.org/10.1007/978-94-011-1454-7_9.

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Balokhonov, Ruslan R., e Varvara A. Romanova. "Microstructure-Based Computational Analysis of Deformation and Fracture in Composite and Coated Materials Across Multiple Spatial Scales". In Springer Tracts in Mechanical Engineering, 377–419. Cham: Springer International Publishing, 2020. http://dx.doi.org/10.1007/978-3-030-60124-9_17.

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AbstractA multiscale analysis is performed to investigate deformation and fracture in the aluminum-alumina composite and steel with a boride coating as an example. Model microstructure of the composite materials with irregular geometry of the matrix-particle and substrate-coating interfaces correspondent to the experimentally observed microstructure is taken into account explicitly as initial conditions of the boundary value problem that allows introducing multiple spatial scales. The problem in a plane strain formulation is solved numerically by the finite-difference method. Physically-based constitutive models are developed to describe isotropic strain hardening, strain rate and temperature effects, Luders band propagation and jerky flow, and fracture. Local regions experiencing bulk tension are found to occur during compression that control cracking of composites. Interrelated plastic strain localization in the steel substrate and aluminum matrix and crack origination and growth in the ceramic coating and particles are shown to depend on the strain rate, particle size and arrangement, as well as on the loading direction: tension or compression.
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Lavoie, Pascal, e Mark P. Taylor. "Alumina Concentration Gradients in Aluminium Reduction Cells". In Advances in Molten Slags, Fluxes, and Salts, 791–98. Hoboken, NJ, USA: John Wiley & Sons, Inc., 2016. http://dx.doi.org/10.1002/9781119333197.ch84.

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Lavoie, Pascal, e Mark P. Taylor. "Alumina Concentration Gradients in Aluminium Reduction Cells". In Advances in Molten Slags, Fluxes, and Salts: Proceedings of the 10th International Conference on Molten Slags, Fluxes and Salts 2016, 791–98. Cham: Springer International Publishing, 2016. http://dx.doi.org/10.1007/978-3-319-48769-4_84.

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Trabalhos de conferências sobre o assunto "Aluminia"

1

Boichuk, T., e S. Orlyk. "Influence of composition (Pd) In-, Co-containing aluminia- and zirconia-based catalysts on simultaneous reduction of nitrogen(I, II) oxides by CO". In Chemical technology and engineering. Lviv Polytechnic National University, 2019. http://dx.doi.org/10.23939/cte2019.01.265.

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Zhong, Z. W., N. P. Hung e J. C. Wong. "DUCTILE-MODE MACHINING OF ALUMINA / ALUMINUM COMPOSITE". In Processing and Fabrication of Advanced Materials VIII. WORLD SCIENTIFIC, 2001. http://dx.doi.org/10.1142/9789812811431_0102.

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Chan, Kwal S., N. Sastry Cheruvu e Gerald R. Leverant. "Coating Life Prediction Under Cyclic Oxidation Conditions". In ASME 1997 International Gas Turbine and Aeroengine Congress and Exhibition. American Society of Mechanical Engineers, 1997. http://dx.doi.org/10.1115/97-gt-389.

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The hot gas path section components of land based turbines require materials with superior mechanical properties and good hot corrosion and oxidation resistance. These components are generally coated with either a diffusion coating (aluminide or platinum aluminide) or with an overlay coating (MCrAlY) to provide additional hot corrosion and/or oxidation protection. These coatings degrade due to inward and outward diffusion of elements during service. Outward diffusion of aluminum results in formation of a protective oxide layer on the surface. When the protective oxide spalls, aluminum in the coating diffuses out to reform the oxide layer. Accelerated oxidation and failure of coating occur when the Al content in the coating is insufficient to reform a continuous alumina film. This paper describes development of a coating life prediction model that accounts for both oxidation and oxide spallation under thermal mechanical loading, as well as diffusion of elements that dictate the end of useful life. Cyclic oxidation data for aluminide and platinum aluminide coatings were generated to determine model constants. Applications of this model for predicting cyclic oxidation life of coated materials are demonstrated. Work is underway to develop additional material data and to qualify the model for determining actual blade and vane coating refurbishment intervals.
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Kireitseu, Maksim, L. Yerakhavets e Ion Nemerenco. "Fatigue of Aluminum-Alumina-Chrome Carbide Composite Coating". In 2002 International Joint Power Generation Conference. ASMEDC, 2002. http://dx.doi.org/10.1115/ijpgc2002-26090.

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In this paper fatigue and fracture of the Al-Al2O3-CrC, coatings have been investigated by in situ experiments performed in a scanning electron microscope. More importantly, micromechanical models using arrays of internal or surface cracks have been developed. The models provide mechanics of deformation and failure for the coating. The models also reveal the role of overloading in crack arrest, which may well be exploited in the safe design of toughened ceramics against fatigue. Initial overloads prior to cyclic loading are found to reduce significantly the crack driving force in post-overload fatigue crack growth. It expected that pre-service overloading has a great potential for improving the fatigue properties of composite coatings based on oxide ceramics and chrome carbide.
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Yang, Youjian, Zhaowen Wang, Weiqin Fu, Bingliang Gao, Xianwei Hu, Yaxin Yu e Yingle Liu. "Dissolution behavior of alumina in molten aluminum electrolyte". In 2010 World Non-Grid-Connected Wind Power and Energy Conference (WNWEC). IEEE, 2010. http://dx.doi.org/10.1109/wnwec.2010.5673290.

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Kawali, S. M., G. L. Viegelahn e R. Scheuerman. "Laser welding of alumina reinforced 6061 aluminum alloy composite". In ICALEO® ‘91: Proceedings of the Laser Materials Processing Symposium. Laser Institute of America, 1991. http://dx.doi.org/10.2351/1.5058436.

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Krasniy, I. B., A. A. Denisova e S. A. Kumacheva. "Direct bonding copper with alumina and aluminum nitride ceramic substrates". In 2016 13th International Scientific-Technical Conference on Actual Problems of Electronics Instrument Engineering (APEIE). IEEE, 2016. http://dx.doi.org/10.1109/apeie.2016.7807089.

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Wang, Jiaqi, Yixin Yin, Lu Zhang, Gaoqi Xiao, Jiarui Cui e Sen Zhang. "Online monitoring system of alumina concentration in aluminum electrolytic cell". In 2016 IEEE International Conference on Information and Automation (ICIA). IEEE, 2016. http://dx.doi.org/10.1109/icinfa.2016.7831983.

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Asano, Kazunori. "Turning machinability of short alumina fiber reinforced aluminum alloy composites". In 2015 International Conference on Solar Energy and Building (ICSoEB). IEEE, 2015. http://dx.doi.org/10.1109/icsoeb.2015.7244939.

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KATSUBA, P., A. YAKIMCHUK e A. LESHOK. "JOULE HEATING OF ALUMINA BARRIER LAYER DURING ANODIZATION OF ALUMINUM". In Proceedings of International Conference Nanomeeting – 2013. WORLD SCIENTIFIC, 2013. http://dx.doi.org/10.1142/9789814460187_0046.

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Relatórios de organizações sobre o assunto "Aluminia"

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QUEST INTEGRATED INC KENT WA. In-Situ Composites in the Aluminum Nitride-Alumina System,. Fort Belvoir, VA: Defense Technical Information Center, janeiro de 1995. http://dx.doi.org/10.21236/ada299416.

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Yokota, Shari Hanayo. Oxidation behavior in reaction-bonded aluminum-silicon alloy/alumina powder compacts. Office of Scientific and Technical Information (OSTI), dezembro de 1992. http://dx.doi.org/10.2172/10141012.

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Yokota, S. H. Oxidation behavior in reaction-bonded aluminum-silicon alloy/alumina powder compacts. Office of Scientific and Technical Information (OSTI), dezembro de 1992. http://dx.doi.org/10.2172/6625941.

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Natesan, K., D. Renusch, B. W. Veal e M. Grimsditch. Microstructural and mechanical characterization of alumina scales thermally developed on iron aluminide alloys. Office of Scientific and Technical Information (OSTI), novembro de 1996. http://dx.doi.org/10.2172/437705.

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Fripiat, J. J. Aluminum coordination and active sites on aluminas, Y zeolites and pillared silicates. Office of Scientific and Technical Information (OSTI), janeiro de 1992. http://dx.doi.org/10.2172/6923291.

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Windisch, C. F. Jr. Final report on DSA methods for monitoring alumina in aluminum reduction cells with cermet anodes. Office of Scientific and Technical Information (OSTI), abril de 1992. http://dx.doi.org/10.2172/5531356.

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Fripiat, J. J. Aluminum coordination and active sites on aluminas, Y zeolites and pillared layered silicates. Office of Scientific and Technical Information (OSTI), janeiro de 1991. http://dx.doi.org/10.2172/5874814.

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Williford, R. E., e C. F. Jr Windisch. Final report on the application of chaos theory to an alumina sensor for aluminum reduction cells. Office of Scientific and Technical Information (OSTI), março de 1992. http://dx.doi.org/10.2172/5638641.

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Fripiat, J. J. [Aluminum coordination and active sites on aluminas, Y-zeolites and pillared layered silicates]. Progress report. Office of Scientific and Technical Information (OSTI), fevereiro de 1994. http://dx.doi.org/10.2172/10122411.

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Windisch, C. F. Jr. Final report on DSA methods for monitoring alumina in aluminum reduction cells with cermet anodes. Inert Electrodes Program. Office of Scientific and Technical Information (OSTI), abril de 1992. http://dx.doi.org/10.2172/10139259.

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