分析High Voltage Direct Current(HVDC)输电系统大地回路运行时地表电位分布,是评估地下金属管道腐蚀、变压器直流偏磁、通信干扰等不良效应受接地极电流影响的前提。文中利用镜像法和电磁波的折射、反射规律,推导出N层垂直和水平复合...分析High Voltage Direct Current(HVDC)输电系统大地回路运行时地表电位分布,是评估地下金属管道腐蚀、变压器直流偏磁、通信干扰等不良效应受接地极电流影响的前提。文中利用镜像法和电磁波的折射、反射规律,推导出N层垂直和水平复合分层的地表电位的解析公式,然后利用这个解析公式解决华东地区地表电位分布的实际问题,通过不同模型计算结果的反馈得到华东地区理想的仿真模型,最后用多项式插值将电位曲线进行拟合,得到华东地区地表电位的一般函数表达式。展开更多
LiNi1-xCoxO2 cathode materials for lithium ion batteries were synthesized by the co-precipitation and solid-state reaction methods with LiOH·H2O, Ni(NO3)2·6H2O and Co(NO3)2·6H2O as raw materials. The ma...LiNi1-xCoxO2 cathode materials for lithium ion batteries were synthesized by the co-precipitation and solid-state reaction methods with LiOH·H2O, Ni(NO3)2·6H2O and Co(NO3)2·6H2O as raw materials. The materials were characterized by XRD, SEM and electrochemical tests. The results showed that synthesized cathode materials were with layered structure similar to α-NaFeO2 and uniform morphology and nearly normal grain size distribution and better electrochemical performance when x was 0.18. The first charge and discharge capacity of the cathode material was 224.3 mAh·g-1 and 194.2 mAh·g-1, respectively. 88.5% of the first discharge capacity remained at the 20th cycle.展开更多
文摘分析High Voltage Direct Current(HVDC)输电系统大地回路运行时地表电位分布,是评估地下金属管道腐蚀、变压器直流偏磁、通信干扰等不良效应受接地极电流影响的前提。文中利用镜像法和电磁波的折射、反射规律,推导出N层垂直和水平复合分层的地表电位的解析公式,然后利用这个解析公式解决华东地区地表电位分布的实际问题,通过不同模型计算结果的反馈得到华东地区理想的仿真模型,最后用多项式插值将电位曲线进行拟合,得到华东地区地表电位的一般函数表达式。
文摘LiNi1-xCoxO2 cathode materials for lithium ion batteries were synthesized by the co-precipitation and solid-state reaction methods with LiOH·H2O, Ni(NO3)2·6H2O and Co(NO3)2·6H2O as raw materials. The materials were characterized by XRD, SEM and electrochemical tests. The results showed that synthesized cathode materials were with layered structure similar to α-NaFeO2 and uniform morphology and nearly normal grain size distribution and better electrochemical performance when x was 0.18. The first charge and discharge capacity of the cathode material was 224.3 mAh·g-1 and 194.2 mAh·g-1, respectively. 88.5% of the first discharge capacity remained at the 20th cycle.
