Modulation-assisted high speed machining of compacted graphite iron (CGI)

The application of controlled, low-frequency modulation (～100 Hz) superimposed onto the cutting process in the feed-direction – modulation-assisted machining (MAM) – is shown to be quite effective in reducing the wear of cubic boron nitride (CBN) tools when machining compacted graphite iron (CGI) at high machining speeds (>500 m/min). The tool life is at least 20 times greater than in conventional machining. This significant reduction in wear is a consequence of the multiple effects realized by MAM, including periodic disruption of the tool–workpiece contact, formation of discrete chips, enhanced fluid action and lower cutting temperatures. The propensity for thermochemical wear of CBN, the principal wear mode at high speeds in CGI machining, is thus reduced. The tool wear in MAM is also found to be smaller at the higher cutting speeds (730 m/min) tested. The feed-direction MAM appears feasible for implementation in industrial machining applications involving high speeds.     

一种基于Linux的嵌入式视频监控系统实现

嵌入式Web视频服务器采用S3C2410微处理器作为主控芯片,扩展了视频采集模块和无线网络模块,实现了视频数据的采集及无线发送功能.同时在该设备上构建了I/O多路复用Web服务器,采用CGI标准和Java applet技术,客户可以跨平台,安全方便地实现对现场的监控.     

用公共网关接口实现水质信息查询

介绍了在Delphi中基于CGI技术的东江水环境决策支持系统,该系统采用B／S(浏览器一服务器)模式,利用ADO组件实现了对水质数据库各种信息的查询、删除或修改等功能,同时介绍了将WWW与数据库相结合的CGI程序的具体设计与实现。