Method for computing the element restoring force, rather than the stiffness matrix, is the most important factor that determines the accuracy of a geometric nonlinear finite element problem.

几何非线性单元的精度主要决定于单元恢复力的计算方法，刚度矩阵对单元精度的影响很小。

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A perturbation method has been developed to derive the approximate computing formulae of propagation constants for te modes on Kerr-type nonlinear symmetric slab optical waveguides.

本文利用微扰法，导出了克尔型非线性对称平板光波导t E模传播常数的近似计算公式。

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The contents include the nonlinear modeling of MESFET's, the method of quick convergence for obtaining the steady state response of nonlinear state equations and computing program.

内容包括FET的非线性电路模型、状态方程向稳态的快速收敛方法及相应程序的编制。

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