发现17f的反应总截面比其邻近同位素的反应总截面稍有增强。
It was found that the reaction cross section of 17f has a little enhancement compared with that of its neighbor isotopes.
最后分别分析了材料性质、截面长宽比、管长和壁厚对最终变形模式的影响。
Moreover, the influences of material property, section properties, tube length and thickness to ultimate deformation modes are studied respectively.
发热部是双螺旋切槽，在电流通过时可以减少其横截面积，因而发热部的阻值比冷端部的阻值大。
The hot zone is formed by cutting a double spiral slot which reduces the cross sectional area through which current flows, resulting in higher resistance than the cold end.
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