SECTION K

This article is related to a calculating method of atomic ionization cross section on K-shell when bombarding a nuclear target with electron.

介绍了利用电子轰击核靶原子K壳层电离截面的一种计算方法。

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The traditional methods for computing critical water depth of open channel with trapezoid section ( h k) are trial and error method, graphic method, approximate solution method and iteration method, whose shortcomings are rough precision, large computation amount and complex resolving problem.

目前计算梯形断面明渠临界水深hk的常用方法有试算法、图解法、近似公式法和迭代法，它们存在计算精度不高、求解复杂等缺点。

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The maximum temperature in the section under load of 250 MW is about 80 K higher than that under load of 200 MW.

250MW负荷水平下的最高温度比200MW负荷水平下的最高温度高约80K；

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With increasing value of height width ratio of water channel K, both the velocity of water flow in the cooled jacket and equivalent heat transfer area of water channel section decreased so that the cooling capacity of cooled jacket was weaken.

水道高宽比K值对水冷套冷却能力的影响规律是：K值增加，水道内水流速、等效传热面积均减小，水套的冷却能力降低。

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Based on the formula for f-k domain migration and in line with the wave theory, the formula for seismic section migration after stack in T-p domain was derived.

本文从F-K域偏移公式出发，系统地导出了叠后地震（时间和伪深度）剖面波动理论的τ-p域偏移公式。

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