基于高盐条件下的Bacillus circulans WZ-12 CCTCC M 207006好氧降解氯化碳氢化合物(英文)

A novel saline-tolerant bacterium Bacillus circulans WZ-12 was evaluated for its potential to degrade four chlorinated hydrocarbons under saline conditions.CH2Cl2 was effectively degraded by Bacillus circulans WZ-12 cells in the medium containing NaCl concentrations ranging from 5 g·L-1 to 10 g·L-1,and the maximum degradation efficiency(85%) was achieved at NaCl concentration of 10 g·L-1.Similarly,Bacillus circulans WZ-12 was able to degrade CH2 BrCl,C2H4Cl2,and C2H2Cl2 in the presence of 10 g NaCl per liter within 24 h.Cells of Bacillus circulans WZ-12 grown in minimal salt medium contained low levels of glycine betaine(GB),but GB levels were 3-to 5-fold higher in cells grown in media with high salt.Kinetic analysis revealed that biodegradation of the four chlorinated hydrocarbons was concentration dependent and a linear inverse correlation(R 2-0.85-0.94) was observed between the rate of biodegradation(V) and salt concentration from 5 g·L-1 to 60 g·L-1.The growing cells(in minimal salt medium) degraded approximately 50% of the CH2Cl2 within 24 h,whereas the resting cells(in physiological saline) degraded only 25% of the CH2Cl2 within 24 h and were inactive after 36 h cultivation.Biodegradation could be repeatedly performed for more than 192 h with more than 50% removal efficiency.Bacillus circulans WZ-12 grows well in an aqueous/oil system,hence,it is effective for the treatment of industrial effluents that contain chlorinated hydrocarbons with high salt concentrations.     

螺旋线圈炮换向过程中的能量损失

从弹丸加速过程中炮系统的反向电压和单匝换向的互感储能变化2个不同角度研究了螺旋线圈电磁发射器（HCEL）的能量转化和损失问题。结果表明：恒流模式下HCEL加速弹丸的动能等于换向过程中损失的电磁能,单匝换向过程中损失的磁能为驱动线圈通电部分前端接通电流匝增加的磁能与其尾部断开匝的剩余磁能之差。     

毛细过滤—自然力在选矿工业中的应用

本文介绍了一种新型高效过滤设备－毛细过滤机的理基础，工作原理，主要结构，应用情况和主要技术参数。毛细过滤机的产品名称为Ｃｅｒａｍｅｃ，结构形式类似盘式过滤机，关键工作部件为氧化铝陶瓷过滤板，这种材料中具有无数微孔，孔径为１．５μｍ和２．０μｍ。毛细过滤机就是利用这种材料和矿浆接触时与液相间发生的毛细现象实现过滤脱水。产品规格为１５－４５ｍ＾２，小型设备规格为１ｍ＾２和５ｍ＾２。应用范围为铜，铜，锌     

DZL118—63二极漏电断路器

上海第三开关厂为了满足国内外用户的需要,设计了DZL118-63二极漏电断路器,已于1992年通过了上海市机电工业管理局组织的鉴定.1993年产品经中华人民共和国上海进出口商品检验局测试合格,获得产品出口许可证.     

冷轧厂镀锌机组的技术改进

本文介绍了热镀锌机组的关键设备－－气刀、小锌花装置和锌层测量系统等进行的技术改造情况及其实施后果的效果。     

超细磨（陶瓷）物料的生产和特性

本文介绍了方解石、刚玉、氧化锌、氧化锆和三氧化二钇超细磨实验的研究结果和观测资料。从微粒到胶质状颗粒的转变中，微观和宏观粉碎过程有明显变化．发生了复杂的固态反应现象并吸收了大量能量，这影响了被磨物料的最初颗粒碎裂、结块和活化．一些显著的实例显示了上面所列物料的超细磨中，重要的界面效应是怎样的和在什么情况下发生的．     

国内外荧光增白剂的状况与展望

综述了国内外荧光增白剂的状况，展望了其发展趋势。