基于JSP＋Oracle的水田机械数据库管理系统的设计与实现

设计并实现了一种针对我国水田机械企业和农民实际需求的数据库管理系统。该系统采用JSP技术开发前台,使用Oracle10g开发后台数据库,实现了水田农业机械的管理、企业管理、机械检索、机械评价等多项功能。系统具有友好的界面、良好的可扩展性,基于Web运行。深入分析研究了该系统的结构和功能并对开发过程中的具体问题和经验进行总结,展望了该系统在农业现代化的应用前景。     

网络监控系统在电厂升压站的应用

大唐淮北发电厂原有220kV升压站的控制系统落后,运行可靠性差。因此,对升压站进行了220kV线路保护、开关控制回路的网络监控系统(NCS)改造,取得成功。     

CYTC12型轮胎式液压钻车

ＣＹＴＣ１２型液压钻车适用于采准巷道最小断面为３．５×４ｍ＾２的中深孔凿岩，孔深可达３０ｍ以上。经镜铁山矿工业试验，累计凿岩达１３２８０ｍ。实践证明，该钻车的平均凿速、台班效率和设备作业率等主要性能指标已达到国外同类产品水平。该钻车已于１９９３年７月２４日通过部级鉴定。     

An Investigation on a Tin Fixed Abrasive Polishing Pad with Phyllotactic Pattern for Polishing Wafer

In order to improve the polishing ability of polishing pads, a kind of polishing pad with the tin fixed abrasive blocks, which are arranged based on the phyllotaxis theory of biology, was designed and fabricated by the use of electroplating technology, and also its polishing ability for JGS-2 wafer was investigated by polishing experiments. The research results show that the phyllotactic parameters of the polishing pad influence the arrangement density of the tin fixed abrasive blocks, the polishing pad with phyllotactic pattern is feasibly fabricated by the use of electroplating technology, and the good polishing result can be obtained by using the polishing pad with phyllotactic pattern to polish a wafer when the diameter D of the tin fixed abrasive block is between Φ1.3 mm and Φ1.4 mm, and the phyllotactic coefficient k between 1.0 and 1.1,respectively.