how to plot a bar chart, that the 1st bar shows real value, and 2nd /3rd / 4th bar shows difference against 1st bar? Thanks.
c*s
4 楼
比如Cockcroft and Walton high voltage charge pump, 有没有什么资料具体讲建模以 及充电时间计算的。谢谢!
j*g
5 楼
收到Invitation to review "Passivation of ZVI by Denitrifying Bacteria and the Impact on Trichloroethene Reduction in Groundwater" (WST-EM121053)。 This is the abstract: Zero-valent iron (ZVI) application in groundwater remediation is limited by its vulnerability to passivation that significantly decreases its surface reactivity. Both biological and chemical processes can potentially passivate ZVI, although the understanding of biological passivation is limited. This study was conducted in bench-scale reactors packed with fresh ZVI or ZVI pre-exposed to nitrate (NO3-) and in the presence or absence of a denitrifying bacterial enrichment (DNBE). The first-order rate coefficients (k) for NO3- reduction by ZVI in the presence and absence of DNBE were 0.20 and 0.09 s-1, respectively, suggesting that both ZVI and microbes contribute to NO3- removal. Abiotic reduction of nitrate was observed in reactors with trichloroethene (TCE) if ZVI was present; however, it resulted in reduced rates of TCE reduction (k = 0.29 s-1) when compared to reactors with fresh ZVI and no nitrate (k = 0.55 s-1). The TCE reduction efficiency decreased by 49% (k = 0.15 s-1) in the presence of DNBE, suggesting that microbial growth or catalyzed oxidation can inhibit TCE reduction by ZVI. Contrary to the presumption that denitrification may decrease ZVI passivation by nitrate, results from this study suggest that denitrifying bacteria actually exacerbate ZVI passivation. 如果有兴趣的话,请尽快发信到我gmail信箱j********[email protected],能附上简历和联系 方式更好(方便editor联系你)。 请不要回复bbs信箱,我很少上线。 -Johnny