排序方式: 共有13条查询结果,搜索用时 15 毫秒
1.
2.
3.
The geometric structures, electronic properties, total and binding energies, harmonic frequencies, the highest occupied molecular orbital to the lowest unoccupied molecular orbital energy gaps, and the vertical ionization potential energies of small LimBn (m+ n = 12) clusters were investigated by the density functional theory B3LYP with a 6-31 I+G (2d, 2p) basis set. All the calculations were performed using the Gaussian09 program. For the study of the LimBn clusters, the global minimum of the B 12 cluster was chosen as the starting point and the boron atoms were gradually replaced by Li atoms. The results showed that as the number of Li atoms increased, the stability of the LimBn cluster decreased and the physical and chemical properties became more active. In addition, on average there was a large charge transfer from the Li atoms to the B atoms. 相似文献
4.
5.
6.
7.
风险理论中破产模型的若干结果 总被引:4,自引:0,他引:4
本文分连续时间和离散时间两种情况对古典的破产模型做了改进和推广 ,并给出了统一的破产概率的表达式 . 相似文献
8.
9.
10.
本文利用相关性和协整检验方法,分析外国直接投资、进出口额和国内生产总值的关系,结果显示三者之间存在协整关系,外国直接投资和国内生产总值共同促进国际贸易的增长,但外国直接投资和国内生产总值不存在协整关系,我国利用外资的水平不高. 相似文献