Periploca sepium, Salix psammophila and Tamarix spp. make up an important part of the local vegetation in the sandland o......

外界能量通过贯通线进入开孔屏蔽体,与PCB上MSL耦合而生成感应电流(Current),加剧了对敏感器件的耦合伤害。故建立含贯通线及PCB板......

为探究吕家坨井田地质构造格局,根据钻孔勘探资料,采用分形理论和趋势面分析方法,研究了井田7......

This review gives a short introduction into the principles of ultraconic measurement techniques for liquids, using cavit......