Higher production, better safety standard, and potential for automation are some of the benefits of longwall mining. Tod......

提出了煤矿工作面上ＵＨＦ无线电波传播的模型，即超大尺寸、周期加载的非理想地模型，由此导出了传播常数的模式方程，得到了主模型的传播常数......