The classical diagrams of radio loudness and jet power as a function of mass and accretion rate of the central spacetime singularity in active galactic nuclei a
Prior to achieving high precision navigation of a spacecraft using X-ray observations,a pulsar rotation model must be built and analysis of the precise position
This paper presents a relative flux calibration method for the Guoshoujing Telescope (LAMOST), which may be applied to connect a blue spectrum to a red spectrum