四面体

OpengL use of light, materials, a list of technologies, the realization of a simple regular tetrahedron, the reference for beginners.

详细说明：利用OpengL的光照、材质、列表技术，实现一个简单的正四面体，适合初学者参考。

Note: The surfaces of the regular tetrahedron (including the edges and the vertices) are considered within the volume.

注：正四面体的表面都可以用来取点。

The result of numeric computation demonstrates that the approximate directional algorithm is robust, the result of Monte Carlo simulation shows that the performance of the optimum four-element array structure is better than the common one or the regular tetrahedron one.

数值计算结果表明，提出的近似定向算法是可靠的；计算机蒙特卡罗仿真结果表明，导出的最佳四元阵列性能优于普通的四元阵和正四面体阵。

The results show that the most stable P5 is the doublet state of b isomer evolved from regular tetrahedron P4 while the most stable P(superscript + subscript 5) and P(superscript - subscript 5) are the singlet state of e, j isomers evolved from square P4, respectively.

结果表明，最稳定的P5为由正四面体的P4演变来的b结构的二重态，P(上标+下标 5)和P(上标-下标 5)则为由正方形P4演变来的e结构和j结构的单重态。

For two possible geometric structures,square and regular tetrahedron,the electronic structures of ground state and structure parameters of the O_4,O-_4 and O+_4 are calculated according to the principle of minimum energy.

计算了2种可能的空间结构——正方形和正四面体，分别得到了这2种结构的中性分子O4，正一价分子O+4和负一价分子O-4的基态电子结构，并根据能量最低原则确定了各自的结构参数，从而得到了O4分子2种结构的基态总能量、一价电离能及电子亲合势能。

The purpose is to calculate the butadiene's π MO by golden section relation and to get radio of positive and negative ions,whose coordination number is 4 by regular tetrahedron.

通过提出丁二烯πMO系数比的黄金分割系数和正四面体重心规律的具体应用，用黄金分割关系求出丁二烯的πMO；用重心规律求出配位数为4的正离子与负离子的半径比。

On the basis of shock wave characteristic of the supersonic projectile and the detailed analysis of measured datas,a method of decomposing and reconstructing the trajectory shock wave signal and muzzle blast wave signal is proposed and the characteristic parameters for positioning sound source and calculating trajectory vector with regular tetrahedron detection array are extracted.

根据空气动力学原理，在阐述超音速弹丸的弹道波特性的基础上，通过详细分析实测的声信号，提出了弹道波信号和枪口冲击波信号的小波分解和重构方法，提取了利用正四面体探测基阵进行声源定位和弹道矢量计算的特征参数，获得了满意的实验结果。

Magnetospheric MultiScale mission design needs spacecrafts flying in a regular tetrahedron configuration about the apogee of an elliptical orbit.

Magnetospheric MultiScale任务利用椭圆轨道远地点附近的正四面体航天器编队，协同完成对地球磁层结构和动力学特性的测量和分析。

Diamonds Time Limit: 1.0 second Memory Limit: 32 MB Sasha is lucky to have a diamond in the form of a regular tetrahedron.

萨拉很幸运拥有一个四面体的钻石。

A map was achieved in detail for the optimal placement of ablation electrode. According to assumption of complete destruction of tumor and its 0.5 cm margin by 5.0 cm ablation device with this method, calculating results were obtained as follows: a tumor of 4.1 ～ 4.3 cm in diameter required 4 ablation at least by the regular tetrahedron way, a tumor of 4.4 ～ 5.6 cm in diameter required 5～8 ablation at least by the regular prism way, a tumor of 5.7 ～ 6.0 cm required 12 ablation at least by the three layers overlapping way.

根据RFA治疗原则消融范围须超越肿瘤周边 0 。5cm以上；按照覆盖类球体肿瘤的计算结果，采用伞径 5 。0cm的射频针，治疗 4.1～ 4.3cm的肿瘤须用正四面体法至少布针 4个点，治疗 4.4～5 。6cm的肿瘤用正棱柱法至少布针 5～ 8个点，治疗 5 。7～ 6 。0cm的肿瘤用三层重叠法至少布针 12个点，方能达到较彻底覆盖灭活肿瘤的效果。

I will endeavour to find you some assistance.

我尽力帮你找人帮忙。

At first I only know bruck is the idol of American younglings, afterwards I returned back to Taiwan ,even in Beijing last year ,I saw her poster everywhere, I was so surprised at her charm.

起初我只晓得布鲁克雷德丝是美国少男少女崇拜的偶像，后来回台湾，甚至去年在北京，居然也四处看见她的海报，才惊讶她的魅力之大。