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......

流感是重大的公共卫生问题,可发生全球大流行.研制安全有效的流感疫苗对控制流感至关重要.然而,由于流感病毒的交叉免疫及其机制尚......

An experimental study on heat transfer and resistance coefficients of linearly arranged smooth and spirally corrugated t......

Gray cast irons were inoculated with FeSi75+RE and FeSi75+Sr inoculants. The changes of apex angle of the drills before ......