Controlled Metal Transfer
Mostrando 1-6 de 6 artigos, teses e dissertações.
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1. Estudo da influência dos parâmetros no processo de soldagem GMAW - arco pulsado
Pulsed gas metal arc welding describes the metal transfer mode involving oscillation (pulsing) of the welding current from a high pulse current in which level drop growth, necking of wire tip and detachment occur, and a low background current, which is applied to maintain the arc. The advantages of the process are: metal transfer without spatter formation an
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 29/09/2011
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2. Aplicação de processos MAG curto-circuito convencional e controlado na soldagem de dutos de aço carbono / Application of MAG processes with short-circuit transfer in conventional and controlled modes for carbon-steel pipe welding
A procura por processos de soldagem versáteis e de alta-produtividade é uma necessidade contínua, em especial na união de dutos que representam o cerne do escoamento dos mais diferentes fluidos. Assim, a pesquisa na soldagem de tubulações utilizando processos MIG/MAG com transferência por curto-circuito controlada tem-se tornado uma tendência na busc
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 28/03/2011
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3. Estudo da interação de nanotubos de carbono com substrato de quartzo cristalino
Single wall carbon nanotubes (SWNTs) are quasi-onedimensional structures consisting of a rolled up graphene nanoribbon. Due to their unusually large surface-to-volume ratio, SWNTs are strongly affected by the environment. Contact with a supporting substrate modifies their properties, and such interactions have been broadly studied as either a drawback or a s
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 24/03/2011
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4. Catalisadores de Pt suportados, obtidos pelo método solgel : efeito do cério na atividade e estabilidade nas reações de reforma do metano
The effect of Ce as a structural and electronic promoter on the activity and stability of Pt catalysts supported on Al2O3 for methane reforming reactions were investigated to elucidate the metal-support interaction. Pt/Al2O3 and Pt/CeO2-Al2O3 catalysts were prepared by conventional method of wet impregnation on commercial supports and on CeO2- Al2O3 mixed ox
Publicado em: 2009
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5. ESTUDO DO COMPORTAMENTO METALÚRGICO DO REATOR KAMBARA ATRAVÉS DE MODELAGEM FÍSICA
The quality requirements of many steel grades are becoming increasingly important due to demand of alloys for sophisticated applications. The sulfur and phosphorus contents of steel grades have become stringent. Sulfur is undesirable except for machinability applications. The tolerance limit for sulfur content is around 50 ppm maximum in the case of many app
Publicado em: 2006
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6. Expression of the IRT1 Metal Transporter Is Controlled by Metals at the Levels of Transcript and Protein Accumulation
Iron, an essential nutrient, is not readily available to plants because of its low solubility. In addition, iron is toxic in excess, catalyzing the formation of hydroxyl radicals that can damage cellular constituents. Consequently, plants must carefully regulate iron uptake so that iron homeostasis is maintained. The Arabidopsis IRT1 gene is the major transp
American Society of Plant Biologists.