  We examine in detail several aspects of the physics of accretion disks of
possible relevance to the outburst mechanism of the black hole X-ray
transients. We adopt the one dimensional, time dependent model described in
detail by Cannizzo, Chen, & Livio with parameters appropriate for a system such
as A0620-00. We investigate (1) the effect of the grid spacing, utilizing a
logarithmic radial spacing $\Delta r\propto r$ in addition to the spacing
$\Delta r\propto \sqrt{r}$, (2) the dependence of the local flow speed of gas
within the hot part of the disk on radius and time during the time of the
cooling wave propagation, (3) the shape of the outburst light curve as a
function of the triggering location for the instability, (4) the long term
light curves of outbursts taken from trials in which complete cycles of
quiescence and outburst are followed, both with and without including the
effect of evaporation or removal of matter from the inner edge of the disk, and
(5) the strength of the self-irradiation of the outer parts of the disk by the
X-rays from the inner disk.
