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We study analytically the moving nonlinear localized vibrational modes (discrete breathers) for a one-dimensional Klein-Gordon diatomic lattice in the whole ω(q) plane of the system by means of a semi- discrete approximation, in which the carrier wave of the modes is treated explicitly while the envelope is described in the continuum approximation. We find that both pulse and kink envelope moving modes for this lattice system can occur with certain carrier wave vectors and vibrational frequencies in separate regions of the ω(q) plane. However, the kink envelope moving modes have not been reported previously for this lattice system. 相似文献
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A certain critical two-soliton solution of the nonlinear Schroedinger equation 总被引:1,自引:0,他引:1 下载免费PDF全文
An exact two-soliton solution of the nonlinear Schroedinger equation is derived by using the Hirota direct approach. This solution describes such a critical process that two still solitons separated infinitely approach and then pass through each other and keep straight on infinitely. 相似文献
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汽车急速停启时的稳定性潘留仙(湖南益阳师专)对行驶的汽车进行受力分析,及对汽车牵引力的讨论,已有多文探讨。本文不再论述。现只就汽车行驶中急速停、启中的问题进行探讨。对于汽车行驶中的稳定性问题,人们一般都很少考虑它的这一运动的特殊性及有关因素,而仅仅把... 相似文献