Academic literature on the topic 'Aluminyl'

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Journal articles on the topic "Aluminyl"

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Hara, Naofumi, Kazuhiko Semba, and Yoshiaki Nakao. "X-Type Aluminyl Ligands for Transition-Metal Catalysis." ACS Catalysis 12, no. 3 (January 12, 2022): 1626–38. http://dx.doi.org/10.1021/acscatal.1c04340.

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Sorbelli, Diego, Leonardo Belpassi, and Paola Belanzoni. "What Singles out Aluminyl Anions? A Comparative Computational Study of the Carbon Dioxide Insertion Reaction in Gold–Aluminyl, −Gallyl, and −Indyl Complexes." Inorganic Chemistry 61, no. 3 (January 6, 2022): 1704–16. http://dx.doi.org/10.1021/acs.inorgchem.1c03579.

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Hicks, Jamie, Petra Vasko, Jose M. Goicoechea, and Simon Aldridge. "Synthesis, structure and reaction chemistry of a nucleophilic aluminyl anion." Nature 557, no. 7703 (April 16, 2018): 92–95. http://dx.doi.org/10.1038/s41586-018-0037-y.

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Hoobler, Preston R., Nery Villegas-Escobar, Justin M. Turney, Alejandro Toro-Labbé, and Henry F. Schaefer. "Substituent Effects on Aluminyl Anions and Derived Systems: A High-Level Theory." Journal of Physical Chemistry A 125, no. 48 (November 23, 2021): 10379–91. http://dx.doi.org/10.1021/acs.jpca.1c08918.

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Sorbelli, Diego, Leonardo Belpassi, and Paola Belanzoni. "Reactivity of a Gold-Aluminyl Complex with Carbon Dioxide: A Nucleophilic Gold?" Journal of the American Chemical Society 143, no. 36 (September 2, 2021): 14433–37. http://dx.doi.org/10.1021/jacs.1c06728.

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Hicks, Jamie, Petra Vasko, Jose M. Goicoechea, and Simon Aldridge. "Publisher Correction: Synthesis, structure and reaction chemistry of a nucleophilic aluminyl anion." Nature 560, no. 7717 (June 4, 2018): E24. http://dx.doi.org/10.1038/s41586-018-0168-1.

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Schwamm, Ryan J., Mathew D. Anker, Matthias Lein, and Martyn P. Coles. "Reduction vs. Addition: The Reaction of an Aluminyl Anion with 1,3,5,7‐Cyclooctatetraene." Angewandte Chemie International Edition 58, no. 5 (January 28, 2019): 1489–93. http://dx.doi.org/10.1002/anie.201811675.

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Anker, Mathew D., Claire L. McMullin, Nasir A. Rajabi, and Martyn P. Coles. "Carbon–Carbon Bond Forming Reactions Promoted by Aluminyl and Alumoxane Anions: Introducing the Ethenetetraolate Ligand." Angewandte Chemie 132, no. 31 (June 2, 2020): 12906–10. http://dx.doi.org/10.1002/ange.202005301.

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Anker, Mathew D., Claire L. McMullin, Nasir A. Rajabi, and Martyn P. Coles. "Carbon–Carbon Bond Forming Reactions Promoted by Aluminyl and Alumoxane Anions: Introducing the Ethenetetraolate Ligand." Angewandte Chemie International Edition 59, no. 31 (June 2, 2020): 12806–10. http://dx.doi.org/10.1002/anie.202005301.

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Kodama, Takuya. "Novel Development of Umpolung at Main Group Element: Synthesis, Structure and Reactivity of Nucleophilic Aluminyl Anion." Journal of Synthetic Organic Chemistry, Japan 77, no. 12 (December 1, 2019): 1247–49. http://dx.doi.org/10.5059/yukigoseikyokaishi.77.1247.

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Dissertations / Theses on the topic "Aluminyl"

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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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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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Lebeau, Thomas. "Wetting of alumina-based ceramics by aluminum alloys." Thesis, McGill University, 1993. http://digitool.Library.McGill.CA:80/R/?func=dbin-jump-full&object_id=68039.

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During the last 20 years, ceramic fiber reinforced metal matrix composites, referred to as MMCs, have provided a relatively new way of strengthening metals. High specific modulus and a good fatigue resistance in dynamic loading conditions or for high temperature applications make these composites very attractive for replacing classic alloys. The first requirement for the fabrication of MMCs, especially by processes involving liquid metals, is a certain degree of wetting of fibers by the liquid metal which will permit a good bonding between the two phases.
The conventional experimental approach to wettability consists of measuring the contact angle of a drop of the liquid metal resting on flat substrate of the ceramic reinforcement materials.
This work deals with the fabrication of eutectic $ rm ZrO sb2/Al sb2O sb3 (ZA), ZrO sb2/Al sb2O sb3/TiO sb2$ (ZAT), and $ rm ZrO sb2/Al sb2O sb3/SiO sb2$ (ZAS) ceramic substrates and the study of their wetting behavior by different classes of Al alloys. Wetting experiments were performed under high vacuum or under ultra high purity Ar atmosphere. Four major variables were tested to study the wetting behavior of the different ceramic/metal systems. Variables include holding time, melt temperature, alloy and ceramic compositions.
Ceramic materials were sintered under vacuum at temperatures ranging from 1500$ sp circ$C to 1790$ sp circ$C for 2.5 hours, and achieved over 96% of the theoretical density. An experimental set-up was designed to measure in-situ contact angles using the sessile drop method. For any ceramic substrate, a temperature over 950$ sp circ$C was necessary to observe an equilibrium wetting angle less than 90$ sp circ$ with pure Al; by alloying the aluminum, wetting could be observed at lower temperatures ($ theta$ = 76-86$ sp circ$ at 900$ sp circ$C for Al-10wt%Si, $ theta sim72 sp circ$ at 850$ sp circ$C for Al-2.4wt%Mg). Finally, ZAS specimens reacted with molten Al alloys over 900$ sp circ$C to produce Zr-Al based intermetallics at the metal/ceramic interface.
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Mearini, Gerald Thaddeus. "Mechanical properties of thin aluminum/alumina multilayer films." Case Western Reserve University School of Graduate Studies / OhioLINK, 1992. http://rave.ohiolink.edu/etdc/view?acc_num=case1056049755.

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Pereira, Marinalda Claudete [UNESP]. "Estudo morfológico e cinético da corrosão por pites em liga de alumínio 1050." Universidade Estadual Paulista (UNESP), 2010. http://hdl.handle.net/11449/103764.

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O objetivo deste trabalho foi estudar as características morfológicas da corrosão localizada na liga de alumínio 1050 e a cinética de crescimento em tamanho dos pites induzidos por ensaios de imersão estática em solução de NaCl, pH 6,0, aerada naturalmente à temperatura ambiente. As amostras foram examinadas antes e após o ensaio de corrosão por microscopia ótica e microscopia eletrônica de varredura e, posteriormente foram analisadas através de um método de captura, processamento digital e análise de imagens, recentemente desenvolvido pelo grupo de Corrosão e Eletroquímica da FEG/UNESP. Exames na superfície da liga após 168h de imersão em NaCl 0,0043 mol/L indicaram um ataque localizado na matriz adjacente às partículas Al:Fe:Si e Al:Fe as quais revelaram um caráter catódico. Mediante análise da variação temporal dos parâmetros obtidos concluiu-se que a área dos pites não muda significativamente enquanto a densidade e a fração de área corroída aumentam com o tempo. A variação temporal indicou que velocidade de corrosão, em termos de propagação superficial, diminui com o tempo de imersão. As características morfológicas e os tamanhos dos pites nos perfis da superfície corroída foram estudados. Os pites induzidos não podem ser representados por uma única geometria, senão pela distribuição morfológica seguinte: i) sem exclusão das cavidades: hemisférico > transição A > transição B > irregular > cônico > cilíndrico; ii) com exclusão das cavidades: hemisférico > transição A > transição B > irregular ~cônico, sem evidências dos pites cilíndricos. Os pites mais profundos foram encontrados especialmente na classe de transição B. A velocidade de crescimento em profundidade (P) ou em largura (L) dos pites foi melhor representada, após a exclusão das cavidades, mediante a lei cinética seguinte:...
This work aim has beem to study the morphologic characteristics of localized corrosion on aluminum alloy 1050 and the growth kinetics in size of pits induced by static immersion tests in NaCl solution, pH 6.0, naturally aerated at room temperature. The samples have been examined before and after the corrosion test by optical microscopy and scanning electron microscopy and subsequently analyzed by a capturing method, digital processing and image analysis, recently developed by the Corrosion and Electrochemistry group of FEG / UNESP. Investigations on the alloy surface after 168h immersion in NaCl 0.0043 mol / L has showed a localized attack on the matrix adjacent to the particles Al: Fe: Si and Al: Fe which have disclosed a cathodic character. By analyzing the temporal variation of obtained parameters it has been concluded that pits area does not change significantly while density and corroded area fraction increase with the time. Temporal variation has indicated that corrosion rate in terms of propagating surface, decreases with immersion time. The morphological characteristics and pits sizes in the corroded surface profiles have been studied. The induced pits may not be represented by a unique geometry, but by the following morphologic distribution: i) without cavities exclusion: hemispheric > transition A > transition B > irregular > conical > cylindrical ii) excluding cavities: hemispheric > transition A > transition B > irregular ~ conical, without cylindrical pits evidence. The deepest pits have been found particularly in transition B class. The pits growth rate in depth (P) or in width (L) has been better represented, after cavities exclusion, by the following kinetics law: P or L = ktm, with k and m empirical values that depend on a combination of different factors
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Mattos, João Jose Ifarraguirre de. "Propriedades de fadiga e micromecanismos de fratura da liga de aluminio-silicio AlSi7Mg0,6 utilizada em cabeçote de motor diesel." [s.n.], 2009. http://repositorio.unicamp.br/jspui/handle/REPOSIP/265248.

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Orientador: Itamar Ferreira
Dissertação (mestrado profissional) - Universidade Estadual de Campinas, Faculdade de Engenharia Mecanica, Faculdade de Engenharia Eletrica e de Computação e Instituição de Quimica
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Resumo: O crescente uso das ligas alumínio-silício fundido na indústria automotiva deve-se principalmente a redução de peso, consumo de combustível e níveis de emissões. Isto inclui a liga de alumínio-silício EN AlSi7Mg0,6, equivalente a liga ASTM A357.0, que é empregada em cabeçotes de motores Diesel. É importante conhecer o impacto na integridade e confiabilidade deste componente na presença de defeitos intrínsecos dos processos de fundição convencional como a de molde permanente. Tais defeitos, como porosidades e filmes de óxidos, quando localizados na superfície, ou próxima a esta, são nucleadores de trincas de fadiga. Neste estudo é analisado o impacto na resistência à fadiga e nos micromecanismos de fratura pelo ensaio de corpos-de-prova fresados com dimensões de 7x14x60mm, retirados do cabeçote da linha de produção e submetidos a ensaio de flexão em três pontos. As superfícies de fratura dos espécimes foram analisadas em microscópio eletrônico de varredura (MEV) a fim de caracterizar os micromecanismos de fratura e o local de iniciação da trinca de fadiga. A resistência à fadiga média, para 1 milhão de ciclos, foi determinada como sendo ao redor de 140MPa. Foi observado na superfície de fratura dos espécimes testados, um claro contraste entre o micromecanismo da zona de fadiga (estrias) e zona final de fratura (alvéolos), sendo que o fator predominante para nuclear trincas de fadiga foram poros próximos da superfície.
Abstract: The increase usage of casting aluminum-silicon alloys in the automotive industry is due to reduce weight, fuel consumption, and emissions level. This includes the aluminum-silicon cast alloy EN AlSiMg0.6 (ASTM A357.0) which is used to make Diesel engine cylinder head. It is important to know the impact on the integrity and reliability of this component in the presence of intrinsical defects of conventional casting parts produced on permanent mold process. Such defects, as porosity and oxide film, when locate on the surface or subsurface of casting parts, could be a fatigue crack initiators. In this paper is analyzed the impact on the fatigue strength and micromechanisms of fracture, by using 7x14x60mm specimens machined from cylinder head drew from production assembly line, and submitted to three point bending tests. Fracture surface of the specimens were observed by SEM to characterize the micromechanisms and the initiation fracture local. The average fatigue strength, based on 1 million of cycles, is about 140MPa. It was observed on the fracture surface of fatigue test specimens, a clear contrast between the micromechanisms of fatigue zone (striations) and the final fracture zone (dimples) and fatigue crack initiation occurs at the porosities near the surface.
Mestrado
Materiais
Mestre em Engenharia Automobilistica
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Panchula, Martin Lawrence. "Synthesis and sintering of nanocrystalline alumina and aluminum nitride." Thesis, Massachusetts Institute of Technology, 1999. http://hdl.handle.net/1721.1/85366.

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Silva, Beethoven Max Alves da. "Influencia da microestrutura inicial e material de molde na tixoconformação da liga A356." [s.n.], 2004. http://repositorio.unicamp.br/jspui/handle/REPOSIP/263687.

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Orientador: Maria Helena Robert
Dissertação (mestrado) - Universidade Estadual de Campinas, Faculdade de Engenharia Mecanica
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Resumo: Neste trabalho investiga-se a influência da microestrutura inicial e do material do molde na tixoconformação da liga A356. São produzidas e testadas em operações de tixoforjamento pastas obtidas por três distintos processos: fusão parcial controlada de estrutlJ'aS dendríticas grosseiras, fusão parcial controlada de estruturas ultra-refinadas e pastas obtidas por agitação mecânica do líquido durante solidificação. É produzido ainda um compósito A356 + Ab03 obtido por compofundição. Os tixoforjados foram submetidos à análise metalográfica para caracterização microestrutural, medindo-se a fração da fase primária e o tamanho médio de glóbulo ou roseta da fase sólida. Os resultados obtidos mostram a viabilidade da utilização de moldes não metálicos e operações de tixoconformação com produtos de bom acabamento superficial e dimensional. As forças de tixoforjamento são dependentes da condição inicial da matéria-prima, de forma que forças maiores são requeridas com o aumento do parâmetro microestrutural básico (espaçamento interdendrítico, tamanho de glóbulo e tamanho de roseta) da matéria-prima
Abstract: This research aims the influence of initial microstructure and die material on thixofonning of A356 alloy. Obtained slurries are produced and tested in thixoforging operation by three distinct processes: controlled partial melting of coarse dendritic structures, controlled partial melting of ultra-refined structures and obtained slurries by liquid mechanical stirring during solidification. It is still produced a composite A356 + AbO:i obtained by compocasting. Thixoforged samples were submitted to metalographic analysis for microstructural characterisation, measuring the primary phase fraction and globule average size or 50lid phase rosette. Obtained results showed the viability of non-metallic dies in thixoforming operations with good superficial and dimensional finishing produds. Thixoforging forces are dependent on initial condition of raw material, 50 that higher forces are required with the increasing of basic microstructural parameter Onterdentritic spacing, globule size and rosette size) of raw material
Mestrado
Materiais e Processos de Fabricação
Mestre em Engenharia Mecânica
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Di, Paolo Pereyra Celeste Gisela. "Evaluación de los efectos de la exposición crónica a aluminio a través de la dieta en ratones Tg2576. Papel protector de la melatonina." Doctoral thesis, Universitat Rovira i Virgili, 2017. http://hdl.handle.net/10803/461611.

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La Malaltia d'Alzheimer (AD) és una malaltia neurodegenerativa progressiva, irreversible i d'origen fins ara desconegut. La hipòtesi de la interacció dels metalls (i en els últims añys, en concret l'alumini) amb altres factors per causar l'AD ha anat guanyant importància gràcies a estudis en els quals s'ha trobat nivells de tres a cinc vegades més grans d'alguns metalls (Cu, Fe, Zn, al ...) acumulats al cervell de pacients de l'AD. La hipòtesi d'aquest treball ha estat: La melatonina és capaç de protegir el cervell contra els danys bioquímics i cognitius ocasionats per l'exposició crònica a alumini en un model de ratolí transgènic per a la Malaltia d'Alzheimer. Per a això s'ha avaluat l'aprenentatge i la memòria, s'han mesurat les concentracions de metalls en diferents teixits i també s'ha quantificat la concentració de caspasa-3 i SOD2 present en còrtex i hipocamp. Finalment, la sobreexpressió del gen APP sembla generar un augment en l'activitat. El tractament amb AlCit provoca dèficits d'aprenentatge i impedeix la retenció de la memòria a llarg termini en els ratolins Tg2576. La melatonina no sembla tenir cap efecte sobre la concentració dels metalls estudiats. Tampoc es va apreciar un efecte significatiu del tractament amb melatonina sobre la quantitat de Aß en el còrtex i hipocamp. Els grups tractats amb alumini i citrat van mostrar els majors nivells de caspasa-3 i SOD2 tant en els grups wild-type com en els Tg2576 i la melatonina no va produir un efecte protector estadísticament significatiu.
La Enfermedad de Alzheimer (AD) es una enfermedad neurodegenerativa progresiva, irreversible y de origen hasta ahora desconocido. La hipótesis de la interacción de los metales (y en los últimos, en concreto el aluminio) con otros factores para causar la AD ha ido ganando importancia gracias a estudios en los que se ha encontrado niveles de tres a cinco veces mayores de algunos metales (Cu, Fe, Zn, Al…) acumulados en el cerebro de pacientes de la AD. La hipótesis de este trabajo ha sido: La melatonina es capaz de proteger al cerebro contra los daños bioquímicos y cognitivos ocasionados por la exposición crónica a aluminio en un modelo de ratón transgénico para la Enfermedad de Alzheimer. Para ello se ha evaluado el aprendizaje y la memoria, se han medido las concentraciones de metales en diferentes tejidos y también se ha cuantificado la concentración de caspasa-3 y SOD2 presente en córtex e hipocampo. Finalmente, la sobreexpresión del gen APP parece generar un aumento en la actividad. El tratamiento con AlCit provoca déficits de aprendizaje e impide la retención de la memoria a largo plazo en los ratones Tg2576. La melatonina no parece tener ningún efecto sobre la concentración de los metales estudiados. Tampoco se apreció un efecto significativo del tratamiento con melatonina sobre la cantidad de Aβ en el córtex e hipocampo. Los grupos tratados con aluminio y citrato mostraron los mayores niveles de caspasa-3 y SOD2 tanto en los grupos wild-type como en Tg2576 y la melatonina no produjo un efecto protector estadísticamente significativo.
Alzheimer's disease (AD) is a progressive, irreversible neurodegenerative disease with an unknowning origin. The hypothesis of the interaction of metals (and nowadays, in particular aluminum) with other factors to cause AD has been gaining importance through studies in which levels of different metals accumulated in the brains of AD patients (Cu, Fe, Zn, Al ...) were three to five times higher. The hypothesis of this study was: Melatonin is able to protect the brain from the biochemical and cognitive damages caused by chronic exposure to aluminum in a transgenic mouse model for Alzheimer's disease. For this purpose, learning and the memory have been evaluated, the concentrations of metals in different tissues have been measured and the concentration of caspase-3 and SOD2 present in cortex and hippocampus had been quantified. Finally, overexpression of the APP gene appears to generate an increase in activity. Treatment with AlCit causes learning deficits and inhibits long-term memory retention in Tg2576 mice. Melatonin does not appear to have any effect on the concentration of the metals studied. Also, there was no significant effect of melatonin treatment on the amount of Aβ in the cortex and hippocampus. The aluminum and citrate treated groups showed the highest levels of caspase-3 and SOD2 in both wild-type and Tg2576 groups and melatonin did not have a statistically significant protective effect.
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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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Books on the topic "Aluminyl"

1

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

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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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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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J. R. Davis & Associates. and ASM International. Handbook Committee., eds. Aluminum and aluminum alloys. Materials Park, OH: ASM International, 1993.

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Harper, Christopher Paul. Effect of alumina particle additions on the aging kinetics of 2014-aluminum matrix composites. Monterey, Calif: Naval Postgraduate School, 1991.

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Tocci, Salvatore. Aluminum. New York: Children's Press, 2005.

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Tocci, Salvatore. Aluminum. New York: Children's Press, 2005.

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Hasan, Heather. Aluminum. New York, NY: Rosen Pub. Group, 2007.

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Walker, Kate. Aluminum. North Mankato, Minn: Smart Apple Media, 2004.

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Book chapters on the topic "Aluminyl"

1

Raahauge, Benny E., and Fred S. Williams. "Introduction: Primary Aluminum–Alumina–Bauxite." In Smelter Grade Alumina from Bauxite, 1–17. Cham: Springer International Publishing, 2022. http://dx.doi.org/10.1007/978-3-030-88586-1_1.

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Arnold, Bozena. "Alumina: The Artificial Aluminum Oxide." In Rubies and Implants, 53–54. Berlin, Heidelberg: Springer Berlin Heidelberg, 2022. http://dx.doi.org/10.1007/978-3-662-66116-1_18.

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Contreras, César A., Esthela Ramos, Satoshi Sugita, and 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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Balokhonov, Ruslan R., and 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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Yu, Yan, and Yu Zhong Ruan. "Activated Alumina Adsorbent Developed from Waste Aluminum Sludge." In Key Engineering Materials, 1886–88. Stafa: Trans Tech Publications Ltd., 2007. http://dx.doi.org/10.4028/0-87849-410-3.1886.

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Balzar, Davor, and Hassel Ledbetter. "Residual Stresses in Aluminum-Mullite (α-Alumina) Composites." In Advances in X-Ray Analysis, 489–97. Boston, MA: Springer US, 1993. http://dx.doi.org/10.1007/978-1-4615-2972-9_55.

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Lindsay, Stephen J., and Pascal Lavoie. "Alumina Quality, HF Removal, Dissolution and Aluminum Purity." In Smelter Grade Alumina from Bauxite, 577–648. Cham: Springer International Publishing, 2022. http://dx.doi.org/10.1007/978-3-030-88586-1_11.

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Murrell, Larry L., N. C. Dispenziere, and K. S. Kim. "Controlled Pore Size, High Alumina Content Silica—Aluminas." In Novel Materials in Heterogeneous Catalysis, 97–102. Washington, DC: American Chemical Society, 1990. http://dx.doi.org/10.1021/bk-1990-0437.ch009.

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Sucharitha, M., and B. Ravi Sankar. "Study on Machinability of Aluminum Alumina Metal Matrix Composites." In Advanced Manufacturing and Materials Science, 309–15. Cham: Springer International Publishing, 2018. http://dx.doi.org/10.1007/978-3-319-76276-0_31.

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Voigt, C., and C. G. Aneziris. "Functional Coatings on Alumina foam Ceramics for Aluminum Filtration." In Proceedings of the Unified International Technical Conference on Refractories (UNITECR 2013), 1315–20. Hoboken, NJ, USA: John Wiley & Sons, Inc., 2014. http://dx.doi.org/10.1002/9781118837009.ch222.

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Conference papers on the topic "Aluminyl"

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Zhong, Z. W., N. P. Hung, and 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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Kireitseu, Maksim, L. Yerakhavets, and 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, and 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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Golec, Joey. "Metamaterial Anti-Reflection Coating Alumina Optics for CMB-S4." In Metamaterial Anti-Reflection Coating Alumina Optics for CMB-S4. US DOE, 2021. http://dx.doi.org/10.2172/1827877.

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Kawali, S. M., G. L. Viegelahn, and 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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Mardilovich, Peter, Dmitri Routkevitch, and Alexander Govyadinov. "New Approach for Surface Microstructuring." In ASME 2000 International Mechanical Engineering Congress and Exposition. American Society of Mechanical Engineers, 2000. http://dx.doi.org/10.1115/imece2000-1069.

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Abstract A new approach for microstructuring of aluminum and alumina surfaces based on localized anodization of aluminum is described. It is based on the self-organized equilibrium at the metal/oxide interface and dynamic interactions between individual oxide growth sites. Hexagonal and square closed-packed arrays of hemispherical and pyramidal features from alumina and aluminum on the micrometer scale were prepared. Potential applications of such microstructured surfaces are discussed.
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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, and 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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Wang, Jiaqi, Yixin Yin, Lu Zhang, Gaoqi Xiao, Jiarui Cui, and 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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Vippola, M., J. Vuorinen, P. Vuoristo, T. Lepistö, and T. Mäntylä. "Thermogravimetric Analysis for Aluminum Phosphate Sealed Alumina and Chromia Coatings." In ITSC2002, edited by C. C. Berndt and E. Lugscheider. Verlag für Schweißen und verwandte Verfahren DVS-Verlag GmbH, 2002. http://dx.doi.org/10.31399/asm.cp.itsc2002p0908.

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Abstract This paper examines plasma-sprayed alumina and chromia coatings, with and without aluminum phosphate sealing, in order to assess the stability of the as-sprayed layers and phosphate reaction as a function of temperature during the sealing process. Thermogravimetric analysis showed no changes in mass in the alumina layers, an increase of 1.7% in the mass of the chromia layers due to oxidation, and a 14% loss of mass in the sealed layers, which agrees well with the evaporation behavior of a pure seal. Paper includes a German-language abstract.
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Reports on the topic "Aluminyl"

1

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

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Ків, Арнольд Юхимович, Володимир Миколайович Соловйов, and Sergey A. Tomilin. Formation of Si precipitates іn neutron irradiated Al. Видавничий відділ КДПУ, 2001. http://dx.doi.org/10.31812/0564/1027.

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Transmutation reactions are the unique way to get a large concentration of Silicon atoms in Aluminum lattice, and just in substitutional positions. Appearing Silicon atoms in Aluminum lattice instead of Aluminum atoms leads to arising of mechanical stresses. This factor is the keystone of the model, which allows to explain the main peculiarities of Si precipitate creation in Aluminum irradiated by thermal neutrons. First, we shall describe the qualitative peculiarities of the model. Then we shall perform some quantitative estimates. At last the model will be discussed and compared with experimental data.
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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), December 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), December 1992. http://dx.doi.org/10.2172/6625941.

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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), January 1992. http://dx.doi.org/10.2172/6923291.

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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), January 1991. http://dx.doi.org/10.2172/5874814.

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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), February 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. Office of Scientific and Technical Information (OSTI), April 1992. http://dx.doi.org/10.2172/5531356.

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Williford, R. E., and 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), March 1992. http://dx.doi.org/10.2172/5638641.

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Sikka, V. K., G. M. Goodwin, and D. J. Alexander. Low-aluminum content iron-aluminum alloys. Office of Scientific and Technical Information (OSTI), June 1995. http://dx.doi.org/10.2172/115407.

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