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非线性振动的一个新的渐近解法 总被引:2,自引:0,他引:2
本文在渐近法的基础上,引进谐波平衡思想,得到了一个新的渐近解法。与传统方法相比,应用本文方法求渐近解,不必解微分方程和依靠消除永年项建立补充工程,而是将求解过程转化为一系列的代数运算。因此,本文解法便于手算,更有利于用计算机计算高阶近似。 相似文献
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尝试工程力学课程设计 总被引:2,自引:1,他引:1
基于``大科学'观理念,以工程产品为设计对象,以知识的连贯性为出发点,
注重知识的融会贯通、课程与工程实际的紧密结合以及对学生综合能力的有效培养. 介绍了
课程设计的指导思想、构成、要求及考核的知识点,总结归纳了课程设计的效果. 实践结果
表明,效果良好,受到学生一致好评. 相似文献
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The complex [Cd(H2mbdpz)(N3)2]n 1 (H2mbdpz = 4,4′-methylenebis(3,5-dimethylpyrazole)) has been hydrothermally synthesized and characterized by single-crystal X-ray diffraction analysis. It crystallizes in the monoclinic system, space groups C2/c with a = 22.154(5), b = 7.4835(15), c = 21.044(8)A^°,β= 115.51(3)°, V= 3148.7(17)A^°3, Z= 8, C11H16CdN10, Mr = 400.75, Dc = 1.691 g/cm^3,μ = 1.401 mm^-1, F(000) = 1599, T= 293(2) K, the final R = 0.0228 and wR = 0.0581 for 3604 observed reflections with I 〉 2σ(I). The structural determination revealed that the coordination environment of Cd(Ⅱ) atom is a distorted octahedron consisting of two nitrogen donors of two H2mbdpz ligands and four nitrogen donors from four azide ligands. The azide moieties act as bridges in two modes: end-on (μ1,1-) and end-to-end (μ1,3-), and H2mbdpz also serves as a bridge with a bis-monodentate coordination. Both bridging ligands link the Cd(Ⅱ) atoms to form a distorted two-dimensional (6,3) layer. 相似文献
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