<正> The Kawahara equation is studied through the approximate homotopy symmetry method.Under thismethod we get the similarity reduction solutions of the Kawahar
<正> The bidirectional transfer of information can be realized in an open Heisenberg ferromagnetic spin chain.The information is encoded in the probability dist
<正> By means of Hirota method,N-soliton solutions of the modified KdV equation under the Bargmannconstraint are obtained through solving the Bargmann constrain