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......

The smoothed monthly sunspot numbers of the previous 22 complete sunspot cycles are normalized in time domain, and then ......

The variation of the near 5-month period of sunspot numbers is discussed on the basis of the wavelet transform of the da......