300m Steel
Mostrando 25-34 de 34 artigos, teses e dissertações.
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25. AvaliaÃÃo Comparativa dos âLININGSâ doa AÃos AISI 444 e AISI 316L para AplicaÃÃo em Torres de DestilaÃÃo de PetrÃleo / Comparative Assessment of "LININGS" donates steels AISI 444 and AISI 316L for Application in Oil Distillation Towers
Os elevados teores de enxofre dos petrÃleos processados nas unidades de refino atacam o âcladâ de aÃo AISI 405 ou 410S, expondo o aÃo estrutural ao meio corrosivo. A recuperaÃÃo da regiÃo desgastada à feita pela aplicaÃÃo de um âliningâ de aÃo AISI 316L. Embora o aÃo AISI 316L garanta uma boa resistÃncia à corrosÃo naftÃnica, surgem trinca
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 27/06/2005
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26. Evaluation of the corrosion resistance of AISI 316 stainless steel filters
In this investigation, the corrosion resistance of AISI 316 SS filters prepared with powders in the size ranges 74-44 µm and 210-105 µm and compacted with pressures of 300 MPa and 400 MPa has been evaluated in naturally aerated 0.5 M H2SO4 solution at 25 °C. Weight loss of filters manufactured with compacting pressure of 400 MPa were significantly higher
Materials Research. Publicado em: 2005-06
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27. Síntese e caracterização de substâncias semelhantes aos ácidos húmicos de carvão de eucalipto, e sua interação com diclorofenol, cálcio, manganês e alumínio / Synthesis and characterization of humic acid-like substances from eucalypt charcoal, and its interaction with diclorofenol, calcium, manganese and aluminium
A wide range of commercial products containing humic substances have been applied successfully in agricultural and environmental remediation systems. Regarding their beneficial remediation characteristics, there is a high potential to adsorb heavy metals and organic pollutants, thus reducing their bioavailability. Industrially, they are extracted from non-re
Publicado em: 2005
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28. Pulsed power modulators for surface treatment by plasma immersion ion implantation
The treatment of surfaces by plasma immersion ion implantation requires pulsed power modulators to provide negative high voltage pulses. To achieve this requirement, we have developed three basic circuit configurations in our laboratory: pulse forming network (PFN), hard-tube pulser (HT) and Blumlein line. In this paper we discuss these three types of circui
Brazilian Journal of Physics. Publicado em: 2004-12
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29. Avaliação do desgaste e da rugosidade superficial de uma resina composta, após escovação simulada, em função de diferentes energias e fontes de luz usadas na polimerização / Evaluation of wear and superficial roughness of a composed resin, after simulated brushing, in function of different energies and sources of light used in the polymerization
An in vitro study was conducted for evaluation of wear and surface roughness of the composite resin FiltekTM Z-250 (3M/ESPE) after simulated toothbrushing, according to different light energies and sources employed for curing. Two light sources were employed, namely halogen (QTH) (VIP/BISCO) and LED (Ultrablue IS / DMC Equipments). A stainless steel template
Publicado em: 2004
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30. Role of nitric oxide of the median preoptic nucleus (MnPO) in the alterations of salivary flow, arterial pressure and heart rate induced by injection of pilocarpine into the MnPO and intraperitoneally
We investigated the effect of L-NAME, a nitric oxide (NO) inhibitor and sodium nitroprusside (SNP), an NO-donating agent, on pilocarpine-induced alterations in salivary flow, mean arterial blood pressure (MAP) and heart rate (HR) in rats. Male Holtzman rats (250-300 g) were implanted with a stainless steel cannula directly into the median preoptic nucleus (M
Brazilian Journal of Medical and Biological Research. Publicado em: 2003-07
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31. Influencia da largura do corpo-de-prova na medida da tenacidade do concreto reforçado com fibras de aço
Toughness indices for steel fiber reinforced concrete (SFRC) may be affected by several factors, depending on the methods adopted and procedures for flexural testing under controlled deformation. These factors include, among others: test configuration; loading configuration; rate and control of loading; type of deflection-measuring equipment; type of test ma
Publicado em: 2001
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32. Instrumentação de um pendulo para ensaio de impacto Charpy
The conventional Impact Charpy Test allows for the determination of the total absorbed energy ( E IND. T ) for fracture of notched specimens. However, such energy is the result obtained by adding two important values : the absorbed energy due to the initiation of fracture ( E IND.I ), and the absorbed energy due to the propagation of this fracture. The aim o
Publicado em: 1994
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33. Automated detection of microbial growth in blood cultures by using stainless-steel electrodes.
Sterile stainless-steel electrodes implanted in blood culture bottles and monitored electronically were used to detect growth of microorganisms. Each blood culture bottle contained 100 ml of medium and was inoculated with 10 ml of blood seeded with either 300 or 50 colony-forming units of one of several bacterial or yeast species that are commonly isolated f
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34. Comparison of the airborne survival of calf rotavirus and poliovirus type 1 (Sabin) aerosolized as a mixture.
A mixture of a cell culture-adapted strain (C-486) of calf rotavirus and poliovirus type 1 (Sabin) was prepared in tryptose phosphate broth containing 0.1% uranine (physical tracer) and antifoam at a final concentration of 0.001%. By using a six-jet Collison nebulizer, the mixture was aerosolized into a 300-liter stainless-steel rotating (4 rpm) drum. The te