提出了一种计算海量平面点集凸壳的快速近似算法——点集坐标旋转法（PSCR）。
The paper presents an efficient approximate algorithm for Convex Hull of very large planar point set. That is Point Set Coordinate Rotation Algorithm(PSCR).
文章阐述了如何利用计算几何中的凸壳问题来处理测量中的DEM建模问题并推导出了TIN的建立方法。
The paper describes how to deal with the modelling of DEM in surveying by using the convex shell problem in the calculation geometry. The method of building TIN is derived.
数值实验表明，改进的基于凸壳的训练数据选取算法缩短了训练时间并保持了良好的泛化能力，具有一定的参考价值。
Numerical experiments show that the improved Convex Hull-based training data selection algorithm reduces the training time, maintains a good generalization ability and has some reference value.
管帽包括凸形管帽、锥壳、变径段、平盖及紧缩口的设计。
Tube caps include convex hull, hats, cone tube diameter changes, flat cover and tightening of design.
散热器加水口盖壳缩径模设计难点是对称凸耳成形及内弯后脱取工件困难。
The difficulty in designing the necking die for water_adding entry lid shell of radiator was the stripping of the part after the forming and in_bending of symmetrical protruding ear.
壳凸红脂块块香。
在积木拼块中，至少包括一种是多边形柱体拼块，该拼块的每一侧边上设有可与主壳体凸棱相楔合凹槽，或设有可与主壳体凹槽相楔合的凸棱。
At least one kind of building block is polygon prism blocks which have grooves to fit for the protrusive arris or have grooves to fit for protrusive arris on the main shell body.
在积木拼块中，至少包括一种是多边形柱体拼块，该拼块的每一侧边上设有可与主壳体凸棱相楔合凹槽，或设有可与主壳体凹槽相楔合的凸棱。
At least one kind of building block is polygon prism blocks which have grooves to fit for the protrusive arris or have grooves to fit for protrusive arris on the main shell body.
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