However, the thin-walled steel tubes are prone to local buckling under axial pressure, especially for the square and rectangular cross-section shape.

但是薄壁钢管在轴向荷载下容易发生局部屈曲，尤其是截面形状为方形或矩形时。

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Numerical calculations have been made for wave-guides with a core of rectangular cross-section embedded in a uniform surround of lower refractive index.

对于掩埋在较低折射率的均匀介质中的距形截面芯子的波导曾作过数值计算。

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In this paper the local co-ordinate method was used for calculating the three dimensional distribution of the magnetic field in a cell by bus bar with rectangular cross-section.

本文采用局部坐标法计算矩形截面大电流母线在电解槽中产生的三维磁场。

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