泊松分布概率密度最大值的计算

[前言] 在指导“统计误差”实验中,为了及时、有效地评价学生实验的质量,需解决迅速处理统计误差大量实验数据的手段及准确确定泊松分布理论曲线的形状。我们分析了实验测得的间断随机变量具有连续性的物理实质的例子,得出在函数近似误     

阵列棒状电极尖端电场的数值计算

引言目前人们对一个棒状电极和板电极之间高压电晕放电已做过透彻理论分析,静电除尘技术的发展要求考虑电极为棒状电极阵列排列时的电晕放电现象。在对电极间隙内电晕流注进行分析时,必须计算棒状电极头部尖端附近的电场,其电场可写为     

Impact of optical–electrical conversion responsivity in sub-sampled photonic analog-to-digital converter

This Letter investigates the impact of the photodiode(PD) saturation in a sub-sampled photonic analogto-digital converter(PADC) with two individual pulse lasers. It is essentially proved that when the optical power to the saturated PD increases, the optical–electrical conversion(OEC) responsivity and digitized output power of the PADC decrease. If femtosecond pulses are employed for the PADC sampling clock, the time-stretching process in a dispersive medium is necessary to decrease the impact of the PD saturation. In contrast, when the sampling clock with picosecond pulses is utilized, the PD saturation is more tolerable, and thus, the OEC responsivity can be improved by an increase of the optical power to the PD no matter if the time-stretching process is employed.