Aluminum Reduction
Mostrando 25-36 de 143 artigos, teses e dissertações.
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25. Gas-Phase Conversion of Glycerol to Acetol: Influence of Support Acidity on the Catalytic Stability and Copper Surface Properties on the Activity
Mesoporous mixed copper-aluminum oxides and copper-silicon oxides were synthesized with polymeric precursors route in order to evaluate the effect of the support acidity on the catalytic stability due to the carbon deposit and the copper surface characteristics on the catalytic activity for the gas-phase conversion of glycerol to acetol. The samples were cha
J. Braz. Chem. Soc.. Publicado em: 2016-12
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26. Effect of Aluminium Addition on the Magnetic Properties of a Semi-Processed Electrical Steel
Aluminum is often added to electrical steels since this element causes improvement of the magnetic properties. However the addition of aluminum is usually limited to 0.30 wt%1. Therefore, this work aimed at evaluating the influence of higher levels of aluminum in the magnetic properties of semi-processed steels. To accomplish this, four types of steel were p
Mat. Res.. Publicado em: 12/09/2016
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27. Root Distribution of Peach Rootstocks Affected by Soil Compaction and Acidity
ABSTRACT Root growth can be limited by physical and chemical conditions of the soil. Compacted and acidic soils, where there is an occurrence of exchangeable Al, constitute barriers to use of the soil by plant roots. The hypothesis of this study was that physical and chemical properties of the inter-row soil of a peach orchard influence the root distribution
Rev. Bras. Ciênc. Solo. Publicado em: 25/07/2016
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28. Effect of addition of nano-hydroxyapatite on physico-chemical and antibiofilm properties of calcium silicate cements
ABSTRACT Objective Mineral Trioxide Aggregate (MTA) is a calcium silicate cement composed of Portland cement (PC) and bismuth oxide. Hydroxyapatite has been incorporated to enhance mechanical and biological properties of dental materials. This study evaluated physicochemical and mechanical properties and antibiofilm activity of MTA and PC associated with z
J. Appl. Oral Sci.. Publicado em: 2016-06
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29. Synthesis and Mechanical Characterization of Iron Oxide Rich Sulfobelite Cements Prepared Using Bauxite Residue
The bauxite residue (BR) is the solid waste of largest generation by the aluminum industry, with a generation estimated in 10 million ton/year in Brazil. Its high alkalinity demands elevated costs to store it safely. Due to the high content of Al2O3 and Fe2O3 in BR, the present study evaluated its application for the synthesis of iron rich sulfobelite clinke
Mat. Res.. Publicado em: 01/03/2016
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30. Innovative low temperature plasma approach for deposition of alumina films
Alumina films were deposited from a new plasma method using aluminum acetylacetonate (AAA) powder as precursor. The AAA was sputtered in argon and oxygen plasma mixtures. It was investigated the effect of the oxygen proportion (O2%) on the properties of the coatings. Deposition rate was derived from the layer height measured by profilometry. The elemental co
Mat. Res.. Publicado em: 2014-12
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31. Influencia de las mezclas de gases Ar-He y Ar-He-O2 en la soldabilidad de la aleación de aluminio AA5083-O usando Proceso GMAW-P automatizado
Problems of industries and manufacturers of welded structures in aluminum alloys are centered on reduction of mechanical properties in welded joints due to heat input effects on heat affected zone (HAZ); as well as, effects of discontinuities and metallurgical defects, high cost repairs, and low productivity. The aim of this work is to evaluate the influence
Soldag. insp.. Publicado em: 2014-09
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32. Cowpea symbiotic efficiency, pH and aluminum tolerance in nitrogen-fixing bacteria
Cowpea (Vigna unguiculata) cultivation in northern and northeastern Brazil provides an excellent source of nutrients and carbohydrates for the poor and underprivileged. Production surplus leads to its consumption in other regions of Brazil and also as an export commodity. Its capacity to establish relationships with atmospheric nitrogen-fixing bacteria is cr
Sci. agric. (Piracicaba, Braz.). Publicado em: 2014-06
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33. Evaluation of a 7050-TAF aluminum alloy submitted to creep age forming
CAF process combines creep and precipitation hardening which are highly dependent on time and temperature. The aging cycle relax the stresses induced during the loading phase. At the end of the process stress relaxation induces shape changes in the part but significant spring back is observed (about 70%). Usually CAF cycles for 7XXX alloys use times around 2
Mat. Res.. Publicado em: 29/04/2014
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34. An outcome analysis and long-term viability of cryopreserved cultured epidermal allografts: assessment of the conservation of transplantable human skin allografts
PURPOSE: To assess the viability of cultured epithelium and preserved by freezing for periods varying from one month to one year. METHODS: Samples of cultured epithelium were incubated in cryoprotectant medium (Group A), packed in aluminum envelopes and packed in polystyrene boxes. The boxes were subjected to a temperature of-70ºC. After freezing for a peri
Acta Cir. Bras.. Publicado em: 2013-12
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35. FTIR study of the relation, between extra-framework aluminum species and the adsorbed molecular water, and its effect on the acidity in ZSM-5 steamed zeolite
The infrared spectroscopy study of zeolite samples, obtained by steam treatment at 560‑960 °C of the ZSM‑5 catalyst (framework Si/Al ratio of 13), suggests an association between adsorbed molecular water and extra‑framework aluminum hydroxyls generated after treatment. Moreover, infrared spectroscopy of adsorbed pyridine shows the reduction of the den
Mat. Res.. Publicado em: 26/03/2013
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36. Prà e PÃs-Tratamento por Eletro-OxidaÃÃo Associada à FotocatÃlise HeterogÃnea em uma ETA por FiltraÃÃo Direta Visando a ReduÃÃo dos Precursores dos Compostos Organoclorados / Pre and Post-Treatment by Electro-Oxidation Associated with Heterogeneous Photocatalysis on an ETA for direct filtration Aiming to Reduce Precursors of Organochlorine Compounds
This study evaluated the performance of the heterogeneous photocatalysis combined with electrooxidation compounding a hybrid photoreactor (contact time: 2.75; 5.5 and 11 min.) to pre-treat eutrophic water, comparing the use of chlorine (5 and 10 mg.L-1) and chlorine dioxide (1.2 mg.L-1), subjected to descending direct filtration (aluminum hydroxychloride at
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 11/10/2012