This paper studies an existing 13.8 kilovolt distribution network which, serves an oil production field spread over an area of approximately 60 kilometers square, in order to locate any fault that may occur anywhere i...This paper studies an existing 13.8 kilovolt distribution network which, serves an oil production field spread over an area of approximately 60 kilometers square, in order to locate any fault that may occur anywhere in the network using fuzzy c-mean classification techniques. In addition, Sections 5 and 6 introduce two different methods for normalizing data and selecting the optimum number of clusters in order to classify data. Results and conclusions are given to show the feasibility for the suggested fault location method. Suggestion for future related research has been provided in Section 8.展开更多
针对Li1.2Mn0.54Ni0.13Co0.13O2材料的首次效率过低和倍率性能差的缺陷,系统研究了中性去离子水、弱酸性的硫酸铵和强酸性的磷酸3种不同pH值的溶液处理对Li[Li0.2-Mn0.54Ni0.13Co0.13]O2综合性能的影响.ICP结果表明预处理液的pH值对Li...针对Li1.2Mn0.54Ni0.13Co0.13O2材料的首次效率过低和倍率性能差的缺陷,系统研究了中性去离子水、弱酸性的硫酸铵和强酸性的磷酸3种不同pH值的溶液处理对Li[Li0.2-Mn0.54Ni0.13Co0.13]O2综合性能的影响.ICP结果表明预处理液的pH值对Li的析出量有显著影响;XRD结果显示处理对材料的体相结构有影响;XPS证实处理对材料表面过渡金属元素的价态没有影响.充放电测试表明,硫酸铵处理后的样品具有最优的电化学性能,首次效率由64.6%提高到85.4%,1 C放电容量从149.5 mA h g?1提高到183.7 mA h g?1,中值电压呈缓和下降趋势.展开更多
文摘This paper studies an existing 13.8 kilovolt distribution network which, serves an oil production field spread over an area of approximately 60 kilometers square, in order to locate any fault that may occur anywhere in the network using fuzzy c-mean classification techniques. In addition, Sections 5 and 6 introduce two different methods for normalizing data and selecting the optimum number of clusters in order to classify data. Results and conclusions are given to show the feasibility for the suggested fault location method. Suggestion for future related research has been provided in Section 8.
文摘针对Li1.2Mn0.54Ni0.13Co0.13O2材料的首次效率过低和倍率性能差的缺陷,系统研究了中性去离子水、弱酸性的硫酸铵和强酸性的磷酸3种不同pH值的溶液处理对Li[Li0.2-Mn0.54Ni0.13Co0.13]O2综合性能的影响.ICP结果表明预处理液的pH值对Li的析出量有显著影响;XRD结果显示处理对材料的体相结构有影响;XPS证实处理对材料表面过渡金属元素的价态没有影响.充放电测试表明,硫酸铵处理后的样品具有最优的电化学性能,首次效率由64.6%提高到85.4%,1 C放电容量从149.5 mA h g?1提高到183.7 mA h g?1,中值电压呈缓和下降趋势.
