The problem of petroleum safety is closely related to national politics and economics security and becomes one of key fo......

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......

In this paper, the hydrodynamic characteristics and flow field around rectangular and delta hydrofoils, moving with a co......