The EPR 9 factors for cubic, tetragonal and orthorhombic Fe^＋ centers in alkali halides MX （M= Li, Na; X = F, CI） are calculated from second-order perturbation formulas of g factors based on cluster approach for 3...The EPR 9 factors for cubic, tetragonal and orthorhombic Fe^＋ centers in alkali halides MX （M= Li, Na; X = F, CI） are calculated from second-order perturbation formulas of g factors based on cluster approach for 3d^7 ions in three symmetries. From calculations, the g factors of these Fe^＋ centers in MX crystals are reasonably explained and the defect structural data for the tetragonal and orthorhombic Fe^＋ centers are estimated. The results are discussed.展开更多
At present, there are several problems such as randomness, blindness and experience in the teaching of public security science major, especially in practical teaching, thus colleges and universities cannot adapt to th...At present, there are several problems such as randomness, blindness and experience in the teaching of public security science major, especially in practical teaching, thus colleges and universities cannot adapt to the requirements of talents training. In order to improve the practice teaching quality of public security practice, we should apply modern instructional design theory. Aiming at the problems existing in the practice teaching of public order, we design a practice teaching system for public security. In the process of practice teaching design of public order, we should pay attention to the starting point of the practice teaching, design of teaching objectives, design of practical teaching content, design of practical teaching mode and evaluation of the practice teaching of public security.展开更多
An octahedrite is a 4-valent polyhedron with only 3-faces and 4-faces. We study edge-partitions of some octahedrites, medial and related polyhedra into central circuits.
基金The project supported by National Natural Science Foundation of China under Grant No. 10274054
文摘The EPR 9 factors for cubic, tetragonal and orthorhombic Fe^＋ centers in alkali halides MX （M= Li, Na; X = F, CI） are calculated from second-order perturbation formulas of g factors based on cluster approach for 3d^7 ions in three symmetries. From calculations, the g factors of these Fe^＋ centers in MX crystals are reasonably explained and the defect structural data for the tetragonal and orthorhombic Fe^＋ centers are estimated. The results are discussed.
文摘At present, there are several problems such as randomness, blindness and experience in the teaching of public security science major, especially in practical teaching, thus colleges and universities cannot adapt to the requirements of talents training. In order to improve the practice teaching quality of public security practice, we should apply modern instructional design theory. Aiming at the problems existing in the practice teaching of public order, we design a practice teaching system for public security. In the process of practice teaching design of public order, we should pay attention to the starting point of the practice teaching, design of teaching objectives, design of practical teaching content, design of practical teaching mode and evaluation of the practice teaching of public security.
文摘An octahedrite is a 4-valent polyhedron with only 3-faces and 4-faces. We study edge-partitions of some octahedrites, medial and related polyhedra into central circuits.
