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排序方式: 共有184条查询结果,搜索用时 15 毫秒
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基于模糊一致矩阵的模糊层次分析法的排序 总被引:162,自引:5,他引:157
分析基于模糊一致矩阵的模糊层次分析法 (FAHP) ,改正文 [4 ]中存在的两个将会误导决策的错误 ,给出并证明模糊一致矩阵的一些重要性质 ,获得模糊互补判断矩阵下的一个简明排序计算公式 ,完善模糊层次分析法的排序原理。 相似文献
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通过动态有限元数值模拟,对钢绳柔性防撞装置在船-桥撞击过程中诸钢绳防撞圈同时发挥作用的所谓“同期作用历时”进行了数值分析,并分析讨论了钢绳防撞圈的柔度特性对于“同期作用历时”的影响。 相似文献
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Prof. Won‐jin Chung Prof. Christopher D. Vanderwal 《Angewandte Chemie (International ed. in English)》2016,55(14):4396-4434
At last count, nearly 5000 halogenated natural products have been discovered. In approximately half of these compounds, the carbon atom to which the halogen is bound is sp3‐hybridized; therefore, there are an enormous number of natural products for which stereocontrolled halogenation must be a critical component of any synthesis strategy. In this Review, we critically discuss the methods and strategies used for stereoselective introduction of halogen atoms in the context of natural product synthesis. Using the successes of the past, we also attempt to identify gaps in our synthesis technology that would aid the synthesis of halogenated natural products, as well as existing methods that have not yet seen application in complex molecule synthesis. The chemistry described herein demonstrates yet again how natural products continue to provide the inspiration for critical advances in chemical synthesis. 相似文献
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Magnetic solid‐phase extraction of brominated flame retardants from environmental waters with graphene‐doped Fe3O4 nanocomposites 下载免费PDF全文
Jing Yang Jun‐qin Qiao Shi‐hai Cui Jia‐yuan Li Jin‐jin Zhu He‐xing Yin Cheng‐yan Zhan Hong‐zhen Lian 《Journal of separation science》2015,38(11):1969-1976
Graphene‐doped Fe3O4 nanocomposites were prepared by a solvothermal reaction of an iron source with graphene. The nanocomposites were characterized by transmission electron microscopy, atomic force microscopy, X‐ray diffraction, superconducting quantum interference, Raman spectroscopy, Fourier transform infrared spectroscopy, and X‐ray photoelectron spectroscopy. This nanomaterial has been used as a magnetic solid‐phase extraction sorbent to extract trace brominated flame retardants from environmental waters. Various extraction parameters were optimized including dosage and reusability of the nanocomposites, and pH of sample matrix. The reliability of the magnetic solid‐phase extraction protocol based on graphene‐doped Fe3O4 nanocomposites was evaluated by investigating the recoveries of 2,4,6‐tribromophenol, tetrabromobisphenol A, 4‐bromodiphenyl ether, and 4,4?‐dibromodiphenyl ether in water samples. Good recoveries (85.0–105.0%) were achieved with the relative standard deviation ranging from 1.1–7.1%. Moreover, it is speculated from characterization and magnetic solid‐phase extraction experiment that there is not only π–π stacking but also possible hydrophobic interaction between the graphene‐doped Fe3O4 nanocomposites and analytes. 相似文献
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