本文应用基于密度泛函理论的第一性原理赝势法，较系统地研究了铜体相和表面相，以及锂离子在铜薄膜中的扩散行为。
Based on the density functional theory, the first principles calculation was performed to investigate the bulk, surface copper and the diffusion in the copper thin film.
通过对单模激光混沌系统增加一个周期扰动，构造一种具有外部周期扰动的新动力学系统，基于数值法研究了系统的混沌态在周期扰动下的动力学行为。
Based on single mode laser system, a new dynamical system under external periodic perturbation modulation is constructed and investigated by using of the numerical analysis method.
本文提出了基于有限元位移法，有限元法分析平面弹性材料的力学行为。
Based on the finite element displacement method, a finite element method on the analysis of mechanical behaviour of plane elastic materials is proposed in this paper.
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