Elemental concentration distributions in space have been analyzed using different approaches. These analyses are of grea......

This study undertakes a systematic examination of characteristics of the spatio-temporal evolution of industrial economi......

　　Nowadays,more and more colleges tend to organize online programming examination,which is benefit to improve students......

为了研究混合对流方程中一个三阶非线性可导方程的凸解的不存在性问题.主要运用方程的等价转化和一些特殊的分析方法去证明在上述......