四面体

Basing on the concepts and algorithms, some traditional algorithms, e.g. Delaunay triangulation for planar polygonal domain, constrained Delaunay triangulation for planar points and Delaunay tetrahedralization for spatial points, are improved.

通过上述概念和算法，改进了多边形Delaunay三角剖分、平面散乱点集约束Delaunay三角剖分和空间散乱点集Delaunay四面体剖分等基于生长算法的传统数据生成方法。

This can greatly decrease intersecting judge amount of ray and cells. This method can be generalized in polyhedron volume data.

此方法并不局限于四面体元数据的体绘制，还可以被广泛地应用在一般多面体元上。

This paper proposes an algorithm to divide an arbitrary polyhedron to tetrahedrons and gives its theoretical basis, data type and implementation.

本文提出了一种将任意多面体剖分为四面体的算法，给出了算法理论基础的证明、算法具体实现步骤及所用数据结构。

The research results are as follows:1. EpNPV is a kind of nuclear polyhedrosis virus.

结果表明： 1.EpNPV为核型多角体病毒，多角体为不规则的三角四面体，大小为0.95～2.69μm，平均1.72±0.07μm。

Additionally,the method to determine position coordinate and trajectory vector of the shooting point with detection array is also studied in this paper.

另外还研究了利用正四面体探测基阵确定射击点空间位置坐标和弹道矢量的计算方法。

RESULTS: The fine 3D FEA model of the crown of the maxillary first premolar was constructed successfully.

结果：建立了人上颌第一前磨牙牙冠的精细三维有限元模型，网格划分后的牙冠三维有限元模型：釉质具有154，355个单元，牙本质具有256，304个单元，共有410，659个10节点四面体单元，模型具有非常高的精确度。

The race for thefastest video card on base of NVIDIA chip is usually made bythree partners: BFG, XFX and EVGA.

竞赛中的最快显卡基于nvidia芯片通常是由三个伙伴：高炉煤气，四面体和

The equations of two classes of 3D polynomial maps that are equivariant with respect to the rotational symmetries of either a regular tetrahedron group or a regular octahedron group are strictly given, on the basis of which the properties of the general Julia sets created by these 3D polynomial maps are discussed and proved.

从理论上分析并证明了三维多项式映射满足等变的条件，精确地给出了关于正四面体群和正八面体群具有旋转不变对称性的两类三维等变映射的具体公式，在此基础上讨论并证明了三维多项式映射的广义Julia集所具有的性质。

A series of convenient methods for the preparation of the paper-folded regular octahedron, regular tetrahedron, and regular cubic cone are presented here.

介绍纸折正四面体、正八面体和正方锥形的简易制作方法，并推广应用于制作天然硅盐的多种复杂阴离子结构及某些多酸阴离子结构的模型

On the basis of investigating the sound field of a plane piston transducer and the relations between sound field and radiation force, by settling four plane piston transducers driven at the same frequency at each corner of a regular triangular pyramid with their sound-beam axes crossing at the center of the pyramid, this technique uses ultrasonic wave synthetic theory to acquire a three-dimensional ultrasonic standing wave field. The micro-component can be captured, transported, released in the range of space by adjusting the phase of the transducers.

在研究单个圆形平面活塞换能器声场分布以及声场和辐射力关系的基础上，将以相同频率驱动的4个平面活塞换能器呈正四面体放置，利用声波合成原理获得三维超声驻波场，通过调整各个换能器发射信号相位之间的关系实现对微构件在空间范围内的俘获、移动、释放等操纵。

Neither the killing of Mr Zarqawi nor any breakthrough on the political front will stop the insurgency and the fratricidal murders in their tracks.

在对危险的南部地区访问时，他斥责什叶派民兵领导人对中央集权的挑衅行为。

In fact,I've got him on the satellite mobile right now.

实际上 我们已接通卫星可视电话了