The rational macro-element method was given to solve Poisson's equation. Through divided to several zone, the method can solve in any shape 2D zone.
通过将求解域划分为一个或多个宏单元，有理宏单元法可对任意形状的二维区域求解。
2
And the reduced linear elastic stiffness matrix is formulated for the macro-element of planar beam attached with springs at both ends through static reduced technique.
采用静力缩减方法，由平面梁单元弯曲平衡方程推导出两端带扭簧的杆件宏单元缩减刚度矩阵。
3
There are more initial nutrients in the straw substrates, and washing can reduce macro-element contents, but effect of washing on middle and trace element contents is not significant.