surface rotational

The results showed that increasing the rotational speed of mould is an effective means to reduce or eliminate the defects of pit and that coating thickness is an important factor influencing outside surface quality of casting pipes.

研究结果表明，提高铸型转速是减少乃至消除铸管表面凹陷的有效手段；涂料层厚度是影响铸管外表面质量的重要因素。

Study on the Influence of Coating Thickness, Mould Structure Type and Rotational Speed on Outside Surface Quality of Centrifugal Casting Ductile Iron Pipes by Heated Mould Method

铸型类型及其转速和涂料层厚度对热型法离心铸造球铁管外表面质量影响的试验研究

The sliding direction of whole slope is assumed. Thus this method can be applied to slope with rotational failure surface such as semispherical, ellipsoid, or composite failure surface that is the combination of the above rotational surface with plane.

该方法适用于对称和非对称的旋转破坏的边坡稳定问题，如边坡破坏面为对称的圆弧、旋转椭圆等旋转面，或者这些旋转面的组合面，或者旋转面与平面的组合面等。

The heat transfer of the disc surface is enhanced with the increase of rotational Reynolds number and non-dimensional mass flow coefficient.

旋转雷诺数和冷气无量纲流量系数的增大都能增强转盘表面的换热效果；

This paper has investigated the expression on rotational motion of earth's surface and Earth's deformation fields with complex vector surface spherical harmonic function, theoretical definition of the crust-fixed reference frames and the terrestrial reference system, and theoretical substantiating to the consistency between them.

本文研究了内核地球模型下的地球表面的旋转运动和地球形变场的复数矢量球函数表示，以及外壳固定参考架、地球参考系的理论定义和它们之间等价性的理论证明。

Among the optical equipments, non_ spherical surface lens has been used in some practical system, so the study of optical character of rotational conicoid and it's thick lens will be valuable.

在光学仪器中，非球面透镜具有一定的实用价值，故对旋转二次曲面及其透镜光学性质的研究将有重要意义。