State Key Laboratory of Information Photonics and Optical Communications;
and School of Science;
Beijing University of Posts and Telecommunications;
Beijing 100876;
China;
atmosphere; oceanic fluids; plasmas; generalized variable-coefficient Korteweg-de Vries-modified Korteweg-de Vries equation; scaling transformations; bilinear forms; N solitons; auto-Bäcklund transformations;