介绍了离子-原子碰撞过程中双微分绝对截面的计算方法。

This paper presents the measurement results of absolute cross-sections of ion-atom collision in detail.

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认为局部隐式有限元法是一种绝对稳定的方法，且具有快速收敛的性质，是求解非线性偏微分方程的一种有效的数值算法。

Locally implicit finite element method is a satisfactory numerical method to solve non-linear partial differential equations for its unconditional stability and its high rate of convergence.

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本文基于高精度绝对式光电轴角编码器，提出采用二阶跟踪微分处理的方法，以准确测量发射车起竖臂工作过程中的角加速度。

The reason of the error in axle-angle position coder for precision tracking and instrumentation radar is analyzed in this paper, and the concrete measures of controlling the error are also proposed.

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