  We demonstrate the behavior of the soliton which, while moving in
non-dissipative and dispersion-constant medium encounters a finite-width
barrier with varying dissipation and/or dispersion; beyond the layer dispersion
is constant (but not necessarily of the same value) and dissipation is null.
The passed wave either retains the form of a soliton (though of different
parameters) or becomes a bi-soliton. And a reflection wave may be negligible or
absent. This models a situation similar to a light passing from a humid air to
a dry one through the vapour saturation/condensation area. Some rough
estimations for a prediction of an output are given using relative decay of the
KdV conserved quantities are given.
  Keywords: KdV- Burgers, non-homogeneous layered media, soliton, bi-soliton,
reflection, refraction.
