Chandra observations of 17 nearby galaxies were analyzed and 166 bright sources with X-ray counts>100 were chosen for temporal analysis.Fractional root mean squ
The cyclical behaviors of sunspots,flares and coronal mass ejections(CMEs) for 54 months from 2008 November to 2013 April after the onset of Solar Cycle(SC) 24
The distribution of abundance for iron-peak elements in dwarf spheroidal galaxies(d Sphs) is important for galaxy evolution and supernova(SN) nucleosynthesis. N