The dielectric barrier surface discharge process is simulated using Poisson's equation and drift-diffusion equation and the distribution history of electron, ion and electric field is gained. 采用泊松方程和漂移-扩散方程对介质阻隔面放电进行数值模拟,得到了电子、离子以及电场分布随时间的变化。
Poisson's distribution combined with Fick's diffusion law is used to describe chloride ions 'invasion and the corresponding formula are presented. 尝试运用结合费克扩散定律的泊松分布来描述氯离子侵蚀现象,给出了相应的公式。
This paper gives some deductions of the properties of higher moment of poisson's distribution by myself proposition 〔 1 〕. 本文对笔者曾撰文〔1〕推出的Poisson分布高阶矩的几个定理作进一步的研究,给出几个推论。
The Poisson's distribution is taken as the prototype distribution of the probability to pertained physical quantity at source. 本文取Poisson分布为震源构造处发震概率对有关物理量分布的原型。
Conclusion The haemocyte change of the cancer patients was similar to acute irradiation of whole body, but the degree was lightened obviously and the speed became slow. The distribution of chromosome aberration was deviated from Poisson's distribution. 结论腹腔肿瘤患者接受放疗后,血细胞变化规律和急性全身照射近似,但变化程度明显减轻,速度变慢,染色体畸变偏离泊松分布。
The authors found that the past quantitative study on regional spatial structure of the Chinese urban system that was based on the random distribution model of Poisson's equation was imperfect, because the contemporary Chinese cities did not fit the character of the random distribution. 当代中国城市的地域空间分布并不具有随机性分布特征,过去运用泊松方程规定的随机分布模型对城镇体系地域空间结构定量划分存在一定的局限性。