Mixing Oxides
Mostrando 1-12 de 12 artigos, teses e dissertações.
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1. Análises de dosagens de concreto asfáltico do tipo Pré Misturado a Frio (PMF) utilizando Resíduos da Construção e Demolição de obras (RCD)
RESUMO Na construção civil, um problema ambiental recorrente é a geração e disposição de Resíduos de Construção e Demolição (RCD) de obras. A utilização do RCD como agregados na composição de concreto asfáltico, do tipo Pré Misturado a Frio (PMF), torna possível a execução de pavimentos rodoviários de baixo tráfego. Diante desses fatos
Matéria (Rio J.). Publicado em: 25/11/2019
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2. Clays for Brick Manufacturing in Actopan, Hidalgo: Physical, Chemical and Mineralogical Characterization
Samples of clays from Actopan, Hidalgo employed in brick manufacturing are physical, chemical and mineralogical characterized. Transmitted polarized light microscopy showed a uniform particle size with grain morphology characteristic of euhedral crystals with quartz, feldspars, nontronite, and iron oxides particles. Scanning Electron Microscopy revealed 75 �
Mat. Res.. Publicado em: 11/05/2017
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3. Parâmetros de monitoramento na produção industrial de componentes em zircônia parcialmente estabilizada com óxido de magnésio / Monitoring parameters for the industrial production of pieces made of magnesia-partially-stabilized zirconia
Zirconia has been widely applied on production of structural components, mainly due to its great mechanical properties. However, these properties are associated to the zirconia tetragonal and cubic phases, which are stable only on high temperatures on pure material, being necessary doping the material with some oxides to keep these phases at ambient temperat
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 08/02/2012
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4. Degradação do PMMA através da reação despolimerização uitlizando catalisadores de óxidos mistos
In this work, mixed oxides were synthesized by two methods: polymeric precursor and gel-combustion. The oxides, Niquelate of Lanthanum, Cobaltate of Lanthanum and Cuprate of Lanthanum were synthesized by the polymeric precursor method, and treated at 300 C for 2 hours, calcined at 800 C for 6h in air atmosphere. In gel-combustion method were produced and oxi
Publicado em: 2009
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5. Condutividade elétrica da solução sólida céria-zircônia dopada com ítrio e gadolínio / Electrical conductivity of solid solution ceria-zirconia doped yttria and gadolinium
Rare earth doped ceria has a great potential to be used as electrolyte in temperatures around 800 C in fuel cells due to its higher electrical conductivity than YSZ. However, the reduction of Ce+4 to Ce+3 in low oxygen partial pressure has introduced limitations for using doped ceria electrolyte due to electronic conduction. Among the several ceria solid sol
Publicado em: 2009
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6. RemoÃÃo de tiofeno utilizando adsorventes preparados por mistura fÃsica
The need for cleaner fuels has increased that the studies aimed at reducing levels of sulfur in gasoline. The presence of sulfur compounds in fractions of oil is highly undesirable because it results in corrosion and environmental pollution. The hydrodesulfurization is the main process responsible for removing sulfur from most of the fuel industry of oil ref
Publicado em: 2008
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7. SYNTHESIS AND CHARACTERIZATION OF MAGNETIC NANOPARTICLES OF MIXING OXIDES OF MnFe2O4 RECOVERED WITH CHITOSAN. STUDIES OF THE DOPADE INFLUENCE WITH Gd3+ IN PROPERTIES STRUCTURAL AND MAGNETIC. Thatiana Gonçalves Diegues Ribeiro / Síntese e caracterização de nanopartículas magnéticas de óxidos mistos de MnFe2O4 recobertas com quitosana. Estudos da influência da dopagem com Gd3+ nas propriedades estruturais e magnéticas
Neste trabalho sintetizou-se e caracterizou-se nanopartículas magnéticas de ferritas de manganês, utilizando-se algumas variáveis, como: pH de precipitação (11, 12 e 13), tipo de base (NH4OH, KOH, LiOH e NaOH), concentração molar da base NaOH (1, 5 e 10 mol.L-1), tempo de aquecimento (0, 1 e 2 horas), a adição do surfactante Tween 80, a dopagem com
Publicado em: 2008
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8. Análise da Conformidade e Caracterização da Matéria- Prima Empregada na Fabricação de Blocos Cerâmicos na Região Metropolitana de Salvador
The potential market of the metropolitan area of Salvador accounts for the estimated consumption of roughly 800 million horizontally perforated extruded clay bricks a year. The growing demand of consumers along with the competitiveness of the structural ceramic sector has driven forward a number of recent efforts and investments towards improving the quality
Publicado em: 2007
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9. Desenvolvimento do sensor baseado em eletrólito sólido de β-alumina para monitoramento de enxofre na indústria siderúrgica / DEVELOPMENT OF CERAMIC SOLID ELECTROLYTE SENSOR BASED ON β-ALUMINA FOR SULPHUR MONITORING IN STEELMAKING INDUSTRY
Electrochemical sensors provide real time information of chemical compositions of molten metal. They can be used to improve the control of various metallurgical processes. One of the most successful and widely used electrochemical sensors is the oxygen sensor, based on zircônia solid electrolyte, usually used in steel making. Sensors are being developed for
Publicado em: 2007
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10. Effect of rare earth oxide additions on oxidation behavior of AISI 304L stainless steel
AISI 304L stainless steel powder compacts containing 2 vol% high purity rare earth oxides were prepared by mixing the different powders in a vibratory mill followed by pressing. The compacts thus obtained were sintered in a vacuum furnace and isothermal oxidation measurements were carried out in a muffle furnace, in air, up to 200 hours at 900 °C. The oxidi
Materials Research. Publicado em: 2006-12
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11. Studio Sperimentale e Modellazione di Processi Selettivi Non Catalitici di Abbattimento di Ossidi di Azoto utilizzando Ammoniaca e Urea come Agenti di Riduzione. Cinetica Chimica e Fluidodinamica. / Experimental and Modelling Study of Selective Non-Catalytic Reduction of Nitrogen Oxides by Ammonia and Urea. Chemical Kinetics and Fluid Dynamics.
Selective non-catalytic reduction (SNCR) process is a post-combustion strategy aimed to reduce the amount of NOx in combustion exhausts through the injection of a reducing compound downstream the main combustion region. The chemical kinetics of the Thermal DeNOx and NOxOUT processes, whose involve the addition of ammonia and urea respectively, was investigat
Publicado em: 1999
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12. Extensive regional atmospheric hydrocarbon pollution in the southwestern United States
Light alkane hydrocarbons are present in major quantities in the near-surface atmosphere of Texas, Oklahoma, and Kansas during both autumn and spring seasons. In spring 2002, maximum mixing ratios of ethane [34 parts per 109 by volume (ppbv)], propane (20 ppbv), and n-butane (13 ppbv) were observed in north-central Texas. The elevated alkane mixing ratios ar
National Academy of Sciences.