Temperature Atmospheres
Mostrando 1-12 de 47 artigos, teses e dissertações.
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1. PREPARATION AND CHARACTERIZATION OF CARBON FROM THE FRUIT OF BRAZIL NUT TREE ACTIVATED BY PHYSICAL PROCESS
RESUMO Carvão ativado é o nome de um grande grupo de materiais que apresentam alto grau de porosidade e, consequentemente, extensa área superficial interna, com propriedades adsortivas de caráter físico e químico. Inúmeros materiais podem ser utilizados como precursores, especialmente biomassa. O objetivo deste trabalho foi obter carvão ativado a par
Rev. Árvore. Publicado em: 14/11/2019
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2. Quality and functional properties of ‘Tupy’ blackberry stored in modified atmosphere conditions
Resumo O objetivo deste trabalho foi avaliar o efeito da temperatura de armazenamento, em atmosfera modificada (AM) passiva, e da composição atmosférica em AM ativa sobre a manutenção da qualidade, do teor de compostos fenólicos totais (CFT) e da atividade antioxidante total (AAT; métodos DPPH e ABTS) de amoras-preta ‘Tupy’. Foram conduzidos dois
Rev. Bras. Frutic.. Publicado em: 24/01/2019
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3. Plasma Carburizing of Sintered Pure Iron at Low Temperature
In this work, plasma carburizing of sintered pure iron at low temperature was investigated. Samples were carburized under a dc abnormal glow discharge in two mixed atmospheres (5%CH4 + 95%H2 and 20%CH4 + 80%H2) at 500 °C and 700 °C for 3 and 6 hours. The influence of these parameters was investigated by Scan Electron Microscopy (SEM), X-ray Diffraction (DR
Mat. Res.. Publicado em: 2015-04
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4. Evaluation of sample temperature and applied power on degradation of stearic acid in inductively coupled radio frequency plasma
Plasma cleaning is a promising technology in surface treatments, despite technological interest its use is limited because its mechanisms still are not entirely understood. This work aims to evaluate how the applied power of an inductively coupled RF discharge at 13,56 MHz, with Ar and Ar+10%O2 atmospheres, affects its capabilities to etch an organic molecul
Mat. Res.. Publicado em: 21/10/2014
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5. Evaluation of decomposition kinetics of poly (ether-ether-ketone) by thermogravimetric analysis
The non-isothermal thermogravimetric methods have been used extensively for the determination of kinetic parameters in polymers. The poly (ether ketones) are used as matrix in advanced high performance composites due its high thermal stability, excellent environmental performance and superior mechanical properties. In this work, the non-isothermal decomposit
Mat. Res.. Publicado em: 17/12/2013
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6. Hardness evaluation, stoichiometry and grain size of titanium nitride obtained with plasma nitriding on Ti-6AI-4V samples
Titanium nitride films were formed on the surface of Ti-6Al-4V discs by plasma nitriding (glow discharge) in different N2:H2 atmospheres at several substrate temperatures. In this study the influence of the process parameters on dynamic micro-hardness were investigated. Grain sizes of the nitride films, determined with X-Ray Diffraction, were related to the
Publicado em: 2011
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7. Tratamento superficial do aço inoxidável ferrítico com revestimento La0,6Sr0,4CoO3 para aplicação como interconectores em células a combustíveis do tipo ITSOFC
High-temperature solid oxide fuel cells (800-1000°C) are energy power generation, directly converting the chemical energy into electricity by combining fuel and oxygen. With the reduction of SOFC operating temperature into an intermediate temperature range of 600-800 °C, it has become possible to replace conventional ceramics with metallic alloys for inter
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 2011
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8. Hardness evaluation, stoichiometry and grain size of titanium nitride films obtained with plasma nitriding on Ti-6Al-4V samples
Titanium nitride films were formed on the surface of Ti-6Al-4V discs by plasma nitriding (glow discharge) in different N2:H2 atmospheres at several substrate temperatures. In this study the influence of the process parameters on dynamic micro-hardness were investigated. Grain sizes of the nitride films, determined with X-Ray Diffraction, were related to the
Matéria (Rio de Janeiro). Publicado em: 2010
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9. Cinética de envelhecimento de aços dual phase de baixa resistência mecânica laminados a frio
The kinetics of static strain aging in cold rolled Dual Phase steels of the 250/450 MPa grade of mechanical strength was studied by means of tensile tests. Two Dual Phase steels, with and without a chromium addition of 0.36wt%, were studied in a pilot scale. After the continuous annealing step, carried out in a Gleeble machine model 3500, the specimens were
Publicado em: 2009
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10. A thermogravimetric analysis of the combustion of a Brazilian mineral coal
Knowledge of coal combustion kinetics is crucial for burner design. This work aims to contribute on this issue by determining the kinetics of a particular Brazilian bituminous coal. Non-isothermal thermogravimetry was applied for determining both the pre-exponential factor and the activation energy. Coal samples of 10 mg and 775 mm mean size were used in syn
Química Nova. Publicado em: 2008
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11. Anatomic and physiological characterization and conservation of minimally processed carrots / Caracterização anatômico-fisiológica e conservação de cenoura minimamente processada
The objective of this study was to characterize the dehydration, white blush and histological location of suberin, lignin and phenolic compounds and assess their contribution to superficial white blush in baby carrots. The effects were assessed of the controlled atmospheres consisting of 2 % O2 + 15 % CO2, 5 % O2 + 5 % CO2 and 10 % O2 + 10 % CO2, all with N2
Publicado em: 2008
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12. Diagnosis of the use of electric energy of slaugterhouse chicken emphasing action of energy efficiency / Diagnostico do uso de energia de um frigorifico de frangos de corte enfatizando medidas de eficiencia energetica
In the slaughterhouses the operations that if unchain in the one before slaughter until the storage of the end item are intensely dependents of the electric energy and answer for the final product quality. This work had as objective to diagnosis, to analyze and to consider solutions that lead to the rational use of the electric energy without intervening or
Publicado em: 2008