According to recent observational and theoretical progresses,the DUrca process (direct Urca process) may be excluded from the category of neutron star cooling m
We present a new method for determining the age and relative contribution of different stellar populations in galaxies based on the genetic algorithm.We apply t
We have performed a statistical study of the properties of the broadband continuum of Narrow Line Seyfert 1 galaxies (NLS1s) by collecting ratio,infrared, optic