A high-speed counter-current chromatography （HSCCC） method was successfully developed for the preparative separation and purification of deoxyschizandrin from Schisandrae Sphenantherae Fructus in one step. The purit...A high-speed counter-current chromatography （HSCCC） method was successfully developed for the preparative separation and purification of deoxyschizandrin from Schisandrae Sphenantherae Fructus in one step. The purity of deoxyschizandrin was 98.5%, and the structure was identified by MS, UV and NMR. This method was simple, fast, convenient and appropriate to prepare pure compound as reference substances for related research on Schisandrae Sphenantherae Fmctus.展开更多
Here the biquaternionic model of electro-gravimagnetic field (EGM-field) has been considered, which describes the change of EGM-fields, charges and currents in their interaction. The invariance of these equations with...Here the biquaternionic model of electro-gravimagnetic field (EGM-field) has been considered, which describes the change of EGM-fields, charges and currents in their interaction. The invariance of these equations with respect to the group of Poincare-Lorentz transformations has been proved. The relativistic formulae of transformation for density of electric and gravity-magnetic charges and currents, active power and forces have been obtained.展开更多
金属氧化物避雷器(MOA)在污秽条件下的内部温升及其热稳定性是研究避雷器耐污能力的重要方面。为此,以GB 11032—2010附录O中的污秽试验方法为基础,同时参考IEEE Std C 62.11—1999,试验比较了不同盐密、不同支架高度等情况下进行人工...金属氧化物避雷器(MOA)在污秽条件下的内部温升及其热稳定性是研究避雷器耐污能力的重要方面。为此,以GB 11032—2010附录O中的污秽试验方法为基础,同时参考IEEE Std C 62.11—1999,试验比较了不同盐密、不同支架高度等情况下进行人工污秽试验时避雷器的内部温升情况,同时还比较了复合外套及瓷外套避雷器的耐污能力及雾湿润条件对避雷器耐污能力的影响等。试验结果表明,仅监测底部阻性电流不能准确反映避雷器的内部热稳定性;考虑雾湿润进行污秽试验时内部温升较高且分散性小。最后提出了一个改进的污秽试验方法,主要增加了雾湿润条件和实时监测内部温度两个条件。展开更多
基金supported by the International Scientific and Technological Cooperation Program of China(No.2009DFA31230)the Industry-University-Research Cooperation Program from Science and Technology Department of Guangdong Province(No.2010B090400533)
文摘A high-speed counter-current chromatography （HSCCC） method was successfully developed for the preparative separation and purification of deoxyschizandrin from Schisandrae Sphenantherae Fructus in one step. The purity of deoxyschizandrin was 98.5%, and the structure was identified by MS, UV and NMR. This method was simple, fast, convenient and appropriate to prepare pure compound as reference substances for related research on Schisandrae Sphenantherae Fmctus.
文摘Here the biquaternionic model of electro-gravimagnetic field (EGM-field) has been considered, which describes the change of EGM-fields, charges and currents in their interaction. The invariance of these equations with respect to the group of Poincare-Lorentz transformations has been proved. The relativistic formulae of transformation for density of electric and gravity-magnetic charges and currents, active power and forces have been obtained.
文摘金属氧化物避雷器(MOA)在污秽条件下的内部温升及其热稳定性是研究避雷器耐污能力的重要方面。为此,以GB 11032—2010附录O中的污秽试验方法为基础,同时参考IEEE Std C 62.11—1999,试验比较了不同盐密、不同支架高度等情况下进行人工污秽试验时避雷器的内部温升情况,同时还比较了复合外套及瓷外套避雷器的耐污能力及雾湿润条件对避雷器耐污能力的影响等。试验结果表明,仅监测底部阻性电流不能准确反映避雷器的内部热稳定性;考虑雾湿润进行污秽试验时内部温升较高且分散性小。最后提出了一个改进的污秽试验方法,主要增加了雾湿润条件和实时监测内部温度两个条件。
