Travelling Wave Solutions to a Special Type of Nonlinear Evolution Equation

A unified approach is presented for finding the travelling wave solutions to one kind of nonlinear evolution equation by introducing a concept of 'rank'. The key idea of this method is to make use of the arbitrariness of the manifold in Painlevé analysis. We selected a new expansion variable and thus obtained a rich variety of travelling wave solutions to nonlinear evolution equation, which covered solitary wave solutions, periodic wave solutions, Weierstrass elliptic function solutions, and rational solutions. Three illustrative equations are investigated by this means, and abundant travelling wave solutions are obtained in a systematic way. In addition, some new solutions are firstly reported here.

Survey of Smoking Rates Among Residents 35—41 Years Old in Guangodong Province

目的 为了解广东省35－44岁居民吸烟情况。方法 1996年10－12月和1997年3－5月采有多阶段整群随机抽样方法选择样本，共调查35－44岁居民1554人。结果 35－44岁居民男、女吸烟率分别为81．4％和4．1％。城市居民786人，乡村768人，男性吸烟率分别为78．1％和84．8％，接近全国最高水平。结论 建议把35－44岁年龄段居民作控烟的重点人群，为今后在广东省有组织、有计划，有针对性地进行控烟运动提供依据。