排序方式: 共有33条查询结果,搜索用时 125 毫秒
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氟硅酸(H2SiF6)的制备和应用 总被引:1,自引:0,他引:1
对氟硅酸的来源、性质、处理进行描述,介绍了一些氟硅酸值得开发利用的途径,指出氟硅酸回收利用的重要战略意义。 相似文献
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基于SIMATIC PCS7,运用CP341模块成功实现了罐区监控系统中Modbus与PCS7的通信. 相似文献
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介绍了转炉二级网络控制系统的硬件结构,软件结构以及系统功能,该系统以TCP/IP为主要协议,实现了从现场设备到上层决策的通讯,控制炼钢过程的有效完成。 相似文献
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Plasma immersion ion implantation(PⅢ) overcomes the direct exposure limit of traditional beamline ion implantation, and is suitable for the treatment of complex work-piece with large size. PⅢ technology is often used for surface modification of metal, plastics and ceramics. Based on the requirement of surface modification of large size insulating material, a composite full-directional PⅢ device based on RF plasma source and metal plasma source is developed in this paper. This device can not only realize gas ion implantation, but also can realize metal ion implantation, and can also realize gas ion mixing with metal ions injection. This device has two metal plasma sources and each metal source contains three cathodes. Under the condition of keeping the vacuum unchanged, the cathode can be switched freely. The volume of the vacuum chamber is about 0.94 m~3, and maximum vacuum degree is about 5?×?10~(-4) Pa. The density of RF plasma in homogeneous region is about 10~9 cm~(-3), and plasma density in the ion implantation region is about 10~(10) cm~(-3). This device can be used for large-size sample material PⅢ treatment, the maximum size of the sample diameter up to 400 mm. The experimental results show that the plasma discharge in the device is stable and can run for a long time. It is suitable for surface treatment of insulating materials. 相似文献
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设计了一种紧凑型同轴结构快前沿Marx发生器,该发生器采用3.3 nF陶瓷电容器作为储能电容,用螺旋形空芯电感作为充电电感,通过各级气体火花开关迅速放电在负载上产生电压脉冲。为使整个Marx发生器结构紧凑,将电容器、气体开关、充电及隔离电感设计为同轴一体化结构,并放置在一个密封的金属圆筒内,通过充氮气和六氟化硫的混合气体来绝缘。采用理论及电路模拟的方法,分析了开关导通状态、分布电容、回路电感等因素对输出波形的影响。Marx发生器的基本运行参数为:十二级Marx发生器在负载50 Ω时输出电压150 kV,开路电压达240 kV,负载输出波形脉冲宽度25 ns,上升时间约10 ns,脉冲功率源能量为7.9 J。 相似文献
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介绍了伊东丰雄的三件建筑作品,并对其作品的建筑思想进行了阐述,对伊东丰雄的三个建筑类型的差异进行了分析,指出临时性、轻盈感、流动性是伊东丰雄建筑给人的最直观的感受。 相似文献