Accurate geometry! Non linear finite element increment equilibrium equation is set up by two orders theory. Typical structure stability is analyzed with this accurate finite element method.
由二阶理论建立了梁杆结构分析的精确几何非线性有限元增量平衡方程，并利用精确有限元方法对一些典型结构进行了稳定性分析。
Topology-finite-element method is used and a topology-finite-element model for diffusion equation of non-equilibrium carriers is obtained.
文中采用拓扑有限元法，得出非平衡载流子扩散方程的拓扑有限元模型。
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