Abstract
The plasma which consists of one species of electrons, one hot species and another cold species of ions has been considered. By using reductive perturbation method it has been shown that the nonlinear ion-acoustic waves in unmagnetized plasmas are governed by the Korteweg-de Vries equation. The mixture of hot species of ions as impurity in the plasmas has been discussed. The effects due to the presence of hot species of ions on the Landau damping has also been considered.
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