查询词典 polyhedrons

Tang Gaohua, Su Huadong, Commutative ring and zero-divisor semigroups of regular polyhedrons.

乔晓云，唐高华，郑学谦。单圈图的全图谱半径，广西科学15（2008），No.3， 224-227 4。

In view of that conventional algorithms of collision detection spend a lot of detection time on complex polyhedrons, an algorithm to divide a convex polyhedron was presented and proved.

针对传统的碰撞检测算法对于复杂多面体之间的碰撞检测时间过长的缺陷，提出并证明了一种凸多面体的剖分算法，该算法能将复杂的凸多面体剖分为简单四面体，利用基于MPI(Mes-sagePassingInterface)并行处理的方法来提高碰撞检测的实时性。

To increase the running speed of the collision detection algorithm, a new approach is proposed, which uses convex Bounding Volume Hierarchies to express convex polyhedron. Thus the distance problem of two convex polyhedrons is come down to a nonlinear programming problem with constraints. The nonlinear programming problem can be solved by simulated annealing genetic algorithm.

为了提高碰撞检测算法的速度，提出用顶点的凸包表示凸多面体，将两个凸多面体间距离的问题归结为一个带约束条件的非线性规划问题，利用模拟退火遗传算法对该问题进行求解。

The shapes of bubbles are polyhedrons, spheres and are most spherized polyhedrons.

所观察到的氦泡可为多面体形或球体形，或多数为球形化的多面体形。

There are two methods are often used. A method is constructing some separate polyhedrons from vertex and edges of 3D wire-frame and combine the polyhedrons with each other one by one. Another is extracting wire-frame to some candidate faces and joining them up according to the nature of 3D object.In this paper, an algorithm of reconstructing 3D object from wire-frame was put forward.

目前有两种方法：一种是把三维实体看成由多个多面体组成的，相应的方法是将线框模型拆分成多个多面体，然后进行多面体的拼接组合重构三维实体；另一种方法是把三维实体看作由多个面组成的，相应方法是搜索可行面并根据三维实体的特点来重构。

The authors introduce the geometrical characteristics and topological characteristics describe each junction of ARG,so the algorithm can not only recognize polyhedrons of different shape but also distinguish between polyhedrons that are of the same shape but their sizes and proportions are different.

结合几何特征和拓扑特征表示ARG中的每个结点，不仅能识别不同形状的目标，而且能把拓扑结构相同，但各部分大小、比例不相同的目标区分开。

Winth the segmentation function, the stepwise decomposition algorithm can be used to compute the intersecting body volume not only of the convex polyhedrons, but also the concave polyhedrons.

像上面所讲到的多面体相交的体积计算这样一类问题，在其他行业也有类似问题的提出和反映，是值得认真研究和需要解决的问题。

Since the vertices of the simplex and the polyhedrons on the slices could directly be determined by the formulas, and the intervals of the variables in the polyhedrons on the slices were narrower, the algorithm was convenient and efficient.

由于单纯形和片上凸多面体的极顶点可以直接通过公式计算，且变量在片上凸多面体上的取值区间更窄，改进的定界阻止算法既方便又高效，这得到了一些经典算例和随机产生的算例的验证。

The region enclosed by a constrained surface is divided into some of constrained maximum empty-sphere convex polyhedrons,the triangulation is followed inside these polyhedrons.

而由空间物体的一组平行截面线重建物体的三维表面则在医学图像和地理信息系统等领域有着广泛的应用。

We integrate the problems of deduction of intersecting grooves and bases in the constructional engineering into the problem calculating the intersecting body volume of irregular polyhedrons, and put forward the stepwise decomposition algorithm of the intersecting body volume of irregular polyhedrons based on computer graphics.

在建筑工程量计算中，被称为扣减量的计算问题，是工程量计算中的难点，如电力工程中非标准的构架、梁柱、沟道、基础等两相交构件的重叠部分体积计算川。

Breath, muscle contraction of the buttocks; arch body, as far as possible to hold his head, right leg straight towards the ceiling (peg-leg knee in order to avoid muscle tension).

呼气，收缩臀部肌肉；拱起身体，尽量抬起头来，右腿伸直朝向天花板（膝微屈，以避免肌肉紧张）。

The cost of moving grain food products was unchanged from May, but year over year are up 8%.

粮食产品的运输费用与5月份相比没有变化，但却比去年同期高8％。