New method of parameter estimation for time varying non linear distributed systems is proposed in term of orthogonality of orthogonal polynomial and differential operation matrix.
利用正交多项式序列的正交性及微分算子矩阵，论述了时变非线性分布参数系统参数估计的正交多项式法。
By using fundamental solution matrix and method of perturbation, we give the expression of general solutions for two classes of differential equations.
运用基解矩阵和摄动方法，给出了两类微分方程的通解表达式。
The SWOT analysis model and large strategy matrix analysis method are used to analyze the competition strategy options the company should adopt, which is differential expansion strategy.
随后，本文综合运用SWOT分析法和波士顿矩阵分析法，提出了企业备选竞争战略，即差异化的市场开发、市场渗透战略。
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