  The nonlinear propagation of dust acoustic solitary waves (DASWs) in an
unmagnetized dusty plasma consisting of negatively charged dust fluid Boltzmann
distributed electrons with two different temperatures Boltzmann distributed
ions with two distinct temperatures are investigated. By employing the
reductive perturbation technique that is valid for a small but finite amplitude
limit the Korteweg de Vries (K-dV) equation have been derived. Our results
reveal that the main quantities of DASWs (such as amplitude and width) are
affected by two different temperatures electrons (as well as ions) temperature
ratios and the number densities of two species of ions. It is shown that both
positive and negative potential DASWs occur in this case.
