马醉木Pieris japonica叶中的三萜类化学成分
Journal Title: Science Paper Online - Year 2006, Vol 1, Issue 4
Abstract
采用各种柱层析分离方法对马醉木叶子的化学成分进行了系统研究,利用NMR和MS技术鉴定其结构分别为 Combreglucoside (1), Niga-ichigoside F1 (2), Euscaphic acid (3), Madasiatic acid (4), Corosolic acid (5), Ursolic acid (6), Uvaol (7)和 β-amyrin (8),其中化合物1-5为首次从杜鹃花科马醉木属植物中分离得到。
Authors and Affiliations
Guangmin Yao, Hui Zhai, Liquan Wang
辽河油田斑岩型油气藏成藏地质模型
辽河油田欧利坨子的油气储层主要是浅成-超浅成相的侵入岩粗面斑岩。与斑岩型金属矿床控矿裂缝十分相似的是,该斑岩的储油裂缝主要是隐爆角砾岩和其它原生裂缝,可称为斑岩型油气藏。本文综合渤海湾其它地区与浅成-超浅成斑岩(玢岩)侵入...
Preparation of poly (p-dioxanone) grafted poly (vinyl alcohol) by solution polymerization method
A graft copolymer of poly (p-dioxanone) and poly (vinyl alcohol) (PVA-g-PPDO) is prepared by solution polymerization using dimethyl sulphoxide as solvent, stannous octoate as catalyst, and poly (vinyl alcohol) as macroin...
无线传感器网络分簇路由改进算法及其性能
针对分簇路由和多跳传输存在的不足,提出一种无线传感器网络(WSNs)分簇路由改进算法,并进行性能分析。改进算法的簇首选择基于节点的剩余能量,簇的建立时,节点综合考虑了节点到簇首及簇首到基站的复合距离,选择复合距离最小的簇加入;...
纳米In2O3-TiO2光催化膜的表征及降解甲苯研究
本文采用溶胶-凝胶法制备了纳米In2O3-TiO2复合溶胶,经多次镀膜得到以铝片为载体的纳米In2O3-TiO2复合膜,以空气中的甲苯为模拟污染物,考察了其光催化性能。结果表明,In2O3的复合对TiO2光催化活性起到促进作用,n(In2O3)/n(TiO2)=0.04...
A new modeling method for magnetic levitation system
This paper proposes a new modeling method for magnetic levitation system to minimize the discrepancy between established model and reality. The method adopts coil parameter identification and balanced current/position me...