无线电波透视仪输入输出阻抗检测分析理论方法

介绍了本质安全电气设备,首次提出了无线电波透视仪的输入、输出阻抗（电阻、电容、电感）的检测方法。通过理论分析,论证了检测方法的可行性,探讨性提出了实际测量方法。     

内外网物理隔离的简便方法

目前内部局域网与外部互联网互联是发展必然。而如何真正的保护内网的安全，保证内部资料，不受外网攻击或窃密，是网络管理的重要工作。只有将内网与外网进行物理隔离才能做到这点。物理隔离技术主要是通过隔离设备让内网和外网互联互通。物理隔离的主要特征，是内网与外网永不直接连接。物理隔离网闸是目前唯一能解决上述问题的安全设备。在基层局域网工作站利用双系统、双网卡同样可达到内外网物理隔离作用，节约、方便、易行。     

异军突起之工业标准与度量衡月刊

专论译论各团产业合理化纪载各国工商标准纪载各国科学标准纪载各国政府购料标准纪载科学管理纪载安全设备纪载本国标准化消息各国度量衡纪载厂家介绍国产介绍     

Envelope Functions of Time Histories in Seismic Safety Evaluation and Scenario Earthquakes

It has been a period of time since the concept of scenario earthquake was proposed, but this concept has rarely been used in seismic safety evaluation in China since then. Meanwhile, because of the uncertainties of magnitudes-distances pairs, there is large arbitrariness while determining the envelope function of time histories in seismic hazard analysis. In this paper, we describe a method to control the envelope functions of the time histories by introducing the most-likely combinations of magnitude and distance of the scenario earthquakes based on a probabilistic method, revise the software of the ellipse model for seismic hazard analysis, and give a computation example.