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研究了杨辉三角中的D av id星恒等式,给出了n阶星恒等式的定义,证明了n(n 3)阶星恒等式的存在性,并且给出了构造n阶星恒等式的方法. 相似文献
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三维面形的光栅投影合成测量技术 总被引:3,自引:1,他引:2
本文提出一种新的物体三维面形测量技术,它在传统的光栅投影测量法的基础上,对待测物体的左右两边分别进行测量,然后将上述的结果进行空间合成。这种方法能够有效地解决目前三维测量中存在的阴影及测量范围不大等不足和问题,为这种方法的实用性提供了广阔的前景。 相似文献
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The nonlinear nonlocal singularly perturbed problems for reaction diffusion equations with a boundary perturbation 总被引:2,自引:0,他引:2
Jingsun Yao Jiaqi Mo 《分析论及其应用》2005,21(3):242-248
The nonlinear nonlocal singularly perturbed initial boundary value problems for reaction diffusion equations with a boundary perturbation is considered. Under suitable conditions, the outer solution of the original problem is obtained. Using the stretched variable, the composing expansion method and the expanding theory of power series the initial layer is constructed. And then using the theory of differential inequalities the asymptotic behavior of solution for the initial boundary value problems is studied. Finally the existence and uniqueness of solution for the original problem and the uniformly valid asymptotic estimation are discussed. 相似文献
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