SYSTEMATIC FORECAST ERROR IN U.S.NMC OPERATIONAL SPECTRAL MODEL

The distribution of monthly mean error of NMC model forecasts and its seasonal variation are investi- gated.The ratio of monthly mean error to standard deviation is used here to find out that the region where a correction of systematic error is needed and appropriate is mainly in low latitudes.The improvement,after the model's vertical resolution and some physical parameters were changed from April 1985,is investigated,and the NMC operational model forecasts have also compared with those of ECMWF.

变电所微机化管理中防误闭锁装置分析

微机防误闭锁装置是指在微机化管理变电所中值班人员在进行就地操作、遥控操作、程序操作等倒闸操作中为了防止误操作的重要技术措施。就变电所中防误闭锁装置的机械闭锁、电气闭锁、电磁锁闭、微机防误闭锁等防误闭锁功能相结合的运行方式为基础,对微机防误闭锁装置进行现场防误功能的可操作性分析。