At present, the method of polar coordinates has become an easy, fast and accurate way in midline measure of road and measure in bridge construction.

目前，极坐标法放样已成为道路中线侧设和桥梁施工测量的一种简便、迅速、精确的方法。

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The computation of natural convection in the annulus between horizontal concentric cylinders using spectral element method in polar coordinates is presented in this paper.

提出了将谱元方法应用到极坐标系下，利用极坐标系下的谱元方法求解环形空间内自然对流问题。

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Firstly, the expressions of free vibration of moderately thick plates in polar coordinates are derived and the general solutions are obtained by the means of method of separation of variables.

首先，导出了用极坐标系描述的中厚板自由振动板的微分方程，用分离变量法求得其一般解。

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