Using the method recently developed by Gan et al. (2001a,2002),We investigate the time variation of the lower energy cutoff (Ec) of nonthermal electrons for thr
The bulk kinetic energy of jets can be dissipated via generating turbulent plasma waves. We examine stochastic particle acceleration in blazar jets to explain t
The ancient record 'Tian-da-yi' (the sky darkened greatly) is identified with the solar eclipse on May 31, 976BC. This identification is demonstrated in
Magnetic fields are observed everywhere in the universe.In this review,we concentrate on the observational aspects of the magnetic fields of Galactic and extrag