排序方式: 共有37条查询结果,搜索用时 15 毫秒
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岷江上游叠溪地震区斜坡变形破坏分区特征及其成因机制分析 总被引:3,自引:0,他引:3
以1933年岷江上游叠溪地震诱发的地面地质灾害基本特征入手,系统阐述了叠溪地震区斜坡变形破坏分区分带的 典型特征,归纳总结了高地震烈度区斜坡变形破坏的空间发育分布规律;重点从斜坡变形破坏分区特征与发震机制和应力场 的成生关系方面,分析探讨了叠溪地震区斜坡变形破坏分区特征的成因机制,阐明了1933年叠溪地震造成震区不同区带斜坡 变形破坏类型和变形破坏强烈程度差异之原因,充分揭示了内生地质作用对浅表生地质灾害的控制作用。 相似文献
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长期规律耕作土壤腐殖质的高分辨核磁共振研究 总被引:1,自引:0,他引:1
利用高分辨核磁共振波谱技术对来自长期规律耕作土壤中的腐殖质进行研究,根据所测核磁共振谱粗略探讨了土壤腐殖质的化学基团组成,及不同耕作模式对土壤腐殖质化学基团构成的影响,及部分土壤腐殖质化学基团之间的偶联关系。 相似文献
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Chen X 《Combinatorial chemistry & high throughput screening》2003,6(3):213-223
Single nucleotide polymorphisms (SNPs) are the most abundant variations in the human genome and have become the primary markers for genetic studies for mapping and identifying susceptible genes for complex diseases. Methods that genotype SNPs quickly and economically are of high values for these studies because they require a large amount of genotyping. Fluorescence polarization (FP) is a robust technique that can detect products without separation and purification and it has been applied for SNP genotyping. In this article the applications of FP in SNP genotyping are reviewed and one of the methods, the FP-TDI assay, is discussed in details. It is hoped that readers could get useful information for the applications of FP in SNP genotyping and some insights of the FP-TDI assay. 相似文献
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第二类柯西奇异积分方程因涉及复奇异因子往往造成求解困难,而适用第一类奇异积分方程的高效数值方法并不能推广至第二类奇异积分方程,即便是第二类奇异积分方程,其数值解法仍是一个难题.为此提出了构造第二类奇异积分方程解析解的一种新方法.通过分解柯西奇异项,并利用雅克比多项式的正交性,推导针对右端载荷项为单项式(monomial)的递推解析解,进而借助级数展开的方法推广至一般的载荷问题.提出的基于递推的解析解构造方案,能完美地结合maple软件编程,从而提供一种方便、快捷、有效的算法.由给出的算例可见,本方法适用于处理界面断裂或接触分析问题中含复数奇异因子的复杂情形,从而为研究该类典型力学问题提供了一种可供选择的方法. 相似文献
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Xiaomin Jin Bei Zhang Tao Dai Wei Wei Xiangning Guoyi Zhang Simeon Trieu Fei Wang 《中国光学快报(英文版)》2008,6(10)
We present a grating model of two-dimensional (2D) rigorous coupled wave analysis (RCWA) to study top diffraction gratings on light-emitting diodes(LEDs). We compare the integrated-transmission of the non-grating,rectangular-grating,and triangular-grating cases for the same grating period of 6μm,and show that the triangular grating has the best performance. For the triangular grating with 6-μmperiod, the LED achieves the highest light transmission at 6-μ gratingbottom width and 2.9-μm grating depth. Compared with the non-grating case, the optimized light transmission improvement is about 74.6%.The simulation agrees with the experimental data of the thin ploymer grating encapsulated flip-chip(FC) GaN-based LEDs for the light extraction improvement. 相似文献