Increasing silicon content on the surface of common silicon steel sheet could be realized through the use of composite electroplating method of iron with silicon powder or with ferrosilicon powder.

• 利用这种方法可以很方便地把传递函数方法扩展到各种变系数微分方程问题， 本文以变截面梁为例进行了讨论， 并建立了一种通用单元以减少计算。