  We review models which include advective accretion disks onto compact objects
and discuss the influence of the centrifugal pressure supported high density
region close to the compact objects on the emitted spectra. We show that the
stationary and non-stationary spectral properties (such as low and high states,
quasi-periodic oscillations, quiescent and rising phases of X-ray novae, etc.)
of black hole candidates could be satisfactorily explained by the advective
disk models.
