National Natural Science Foundation of China(No.19731003,No.19961003);Yunnan Provincial Natural Science Foundation of China(No.1999A0018M,No.2000A0002M)
The method of the phase plane is emploied to investigate the solitary and periodic traveling waves for a class of nonlinear dispersive partial differential equations.By using the bifurcation theory of dynamical system...
Project supported by the National Natural Science Foundation of China (Grant No. 19731003).
The boundedness of all the solutions for semilinear Duffing equationx″ + ω2 x + φ(x) =p(t), ω ∈ ?+? is proved, wherep (t) is a smooth 2π-periodic function and the perturbation ?(x) is bounded.
Project supported by the National Natural Science Foundation of China (Grant No. 19731003);Science Foundation of Yunnan Province.
Using the theory of existence of periodic solutions of Hamiltonian systems, it is shown that many periodic solutions of differential delay equations can be yielded from many families of periodic solutions of the coupl...