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Based on the concepts of fractal super fibers, the (3, 9+2)-circle and (9+2, 3)-circle binary fractal sets are abstracted form such prototypes as wool fibers and human hairs, with the (3)-circle and the (9+2)-circle fractal sets as subsets. As far as the (9+2) topological patterns are concerned, the following propositions are proved: The (9+2) topological patterns accurately exist, but are not unique. Their total number is 9. Among them, only two are allotropes. In other words, among the nine topological patterns, only two are independent (or fundamental). Besides, we demonstrate that the (3, 9+2)-circle and (9+2, 3)-circle fractal sets are golden ones with symmetry breaking. 相似文献
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所谓"少学时材料力学课程"是指开设材料力学课程所需学时数不超过60学时。根据部分工科院校的不完全统计,开设这一课程的专业在60种以上;必修这门课程的学生人数约占工科院校在校学生总数的60-70%。有的工科院校每年20多个专业的700多名学生修少学时材料力学课程。因此,少学时材料力学教学质量的好坏,影响很大。而目前在这门课程的教学中又确有许多问题需要讨论和解决。例如在一些工科院校中,选修少学时材料力学课程的专业,对这门 ... 相似文献
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Based on fractal super fibers and binary fractal fibers, the following objectives are approached in this paper: First, the concept of multiple-cell elements is induced and abstracted. Second, through multiple-cell elements, the constructability of regular multifractals with strict self-similarities is confirmed, and the universality of the con- struction mode for regular multifractals is proved. Third, through the construction mode and multiple-cell elements, regular multifractals are demonstrated to be equivalent to generalized regular single fractals with multilayer fine structures. On the basis of such equivalence, the dimension formula of the regular single fractal is extended to that of the regular multifractal, and the geometry of regular single fractals is extended to that of regular multifractals. Fourth, through regular multifractals, a few golden fractals are constructed. 相似文献
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基础力学课程研究型教学方法的探索 总被引:5,自引:3,他引:5
通过基础力学课程教学组3年中对研究型教学的研究和教学实践的摸索总结,结合理论力学课程教学实践,阐述研究型教学方法的理念、内容、方法与过程. 相似文献
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