球面各向同性冲击载荷作用下弹性球体求解的Green函数法

通过建立球面各向同性冲击载荷作用下弹性球体的Green函数,得到了问题的位移分布的解析解和相应的动应力分布表达式.此解法不仅避免了将动力学的一般解分解为拟静态解和自由振动解叠加的过程,而且解的形式适用于各种初始条件,便于数值计算和应力分布规律的分析.通过一个实例的计算,表明了求解方法的正确性,并据此结果具体分析了弹性球体的动应力分布规律.

On the Construction of Practical Teaching System for Major of International Economy and Trade in Local Undergraduate Colleges

Based on the analysis of the employment status, starting with the major orientation of international economy and trade in local undergraduate colleges, this paper studies how to construct a practical teaching system for this major. It emphasizes that the development of practical ability should begin with foreign languages and professional knowledge. We should particularly develop students＇ practical ability in the basic skills, the application of foreign languages, the international trade and the specialized practice. Therefore, local undergraduate colleges must grasp three core practical aspects, namely, application of foreign language, practical aspects of professional courses, novitiate and gradu- ation training in the course of constructing practical teaching system. Finally, corresponding recom- mendations on curriculum reform are given for the adaptation of constructing practical teaching sys-tem.