The possible B2CN crystal structures with hexagonal and heterodiamond structures were studied by first principles calculation.
采用第一性原理研究了B2CN晶体可能的六方结构和异质金刚石结构；
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.
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。
The discussion was made about the above phenomenon based on related results derived from the first-principles calculation.
结合第一原理计算的相应结果，对上述现象进行讨论。
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