We present preliminary analyses of spectra of quasar candidates in two Guoshoujing Telescope (GSJT, formerly named the L......

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 redshift range from 2.2 to 3 is known as the 'redshift desert' of quasars because quasars with redshifts in this ran......

We report on the optical color variability of a sample of 24 blazars,consisting of nine flat spectrum radio quasars (FSR......