本文证明了球面有限点集的伪对称性可以完全由其特征多项式的根来刻画，并得到了在度量加运算下伪对称性具有封闭性。
In this paper, we show that the Pseudo-Symmetric property of spherical point set can be characterized by the eigen values of eigenpolynomial and it has the closeness under the metric sum operation.
在关键井点测井资料研究基础上，结合岩石力学实验，用有限单元方法对迪那气田古近系储集层现今地应力分布做出预测。
Based on key well log data and rock mechanics experiment, the present ground stress distribution of Paleogene reservoir in Dina gas field is predicted with finite element method.
根据雾滴前向驻点处有限直径粒子的沉积行为分析了雾滴与粒子间的静电作用对小粒子捕集效果的影响。
The mass transfer rate at the forward stagnation point of the droplet is derived to show the effect of electrostatic forces on the collection of submicron particles.
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