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In order to further understand the characteristics of the floating potential of low earth orbit spacecraft,the effects of the electron current collection area,background electron temperature,photocurrent emission,spacecraft wake,and the shape of spacecraft on spacecraft floating potential were studied here by particle-in-cell simulation in the low earth orbit.The simulation results show that the electron current collection area and background electron temperature impact on the floating potential by changing the electron current collection of spacecraft.By increasing the electron current collection area or background electron temperature,the spacecraft will float at a lower electric potential with respect to the surrounding plasma.However,the spacecraft wake affects the floating potential by increasing the ion current collected by spacecraft.The emission of the photocurrent from the spacecraft surface,which compensates for the electrons collected from background plasma,causes the floating potential to increase.The shape of the spacecraft is also an important factor influencing the floating potential. 相似文献
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为了在生物电特性与生化特性之间建立明确的映射关系,采用微加工技术于硅玻璃基底上研制出了叉指结构金电极阵列,组装出了能实时、连续获得细胞电阻抗谱的测量装置。将子宫颈癌细胞接种于测量装置中,细胞在电极上进行正常贴附生长,使用Parstat4000连接测量装置获得了不同时刻频率范围为1 Hz~1 MHz的细胞电阻抗谱数据;在已有细胞阻抗谱等效电路模型基础上,根据实际测量阻抗谱数据,结合细胞生理过程电特性,提出了修正细胞阻抗模型。研究结果表明,该修正模型用于拟合阻抗数据的方差比原模型小,同时修正模型包含参数按变化趋势分作两组,分别反映细胞贴附生长过程中溶液特性的变化和细胞本身的变化,最终建立了细胞阻抗数据与细胞生理变化之间的定性关系。 相似文献
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