四面体的

Each atom behaves like a tiny bar magnet, and when the crystal is cooled to near absolute zero, the atom-magnets align.

有时候，四面体四个角中的三个排列在一起，使得四面体的中心产生磁单极子。

As we all know,there is one Simson line at any point on the circumference of triangles,but in this paper, LHP theorem shows that the above conclusion is not correct for any quadrilateral pyramid in three-dimensional space and also during proving LHP theorem,fixed value theorem is proved,at the same time,one guess about the point H and point P on circumscribed sphere of tetrahedron has been concluded.

众所周知，三角形的外接圆周上任一点存在一条 simson 线，而 LHP 定理则指出对于正四面体该结论是不能推广到三维空间上的，并且在论证 LHP 定理的过程中得出了定值定理，同时作为一般四面体的外接球球面上的 H 点、P 点的分布，给出了一个猜想。

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。

Fractal with OPENGL programming, you can see a rotation to regular tetrahedron, each tetrahedron is a fractal pattern interview.

详细说明：分形，用OPENGL编程，可以看到一个旋转地正四面体，正四面体的每一面试一个分形图案。

Particle system and Opengl mapping technology, according to the nature of being tetrahedron, a tetrahedral formation!

利用粒子系统和Opengl贴图技术，根据正四面体的性质，生成一个正四面体！

For the cement, the surface hydration is the primary process at the initial stage, the kaolin disorganizes and gets into the solution in the form of the silicate tetrahedron and aluminate tetrahedron at the induce stage; the silicon-aluminum tetrahedron network structure is formed at the accelerate stage; the unti-network structure is formed and the rate of heat evolution falls at the decelerate stage; the reaction finished ultimately at the stable stage.

但其水化机理与传统的硅酸盐水泥不同：初始期主要是表面水化，诱导期是高岭土解体并以硅氧四面和铝氧四面体的形式进入液相；加速期形成硅铝四面体网络结构；减速期网络基本形成，水化放热速率降低；稳定期反应速率很低，网络结构趋于稳定。

Here is the method to get the volume from the boundary defined by a set of oriented faces defined by sets of triangles that can be oriented: if we imagine that the volumetric object is decomposed into a set of tetrahedrons, it is necessary just to calculate the sum of volumes of each tetrahedron.

用一些有方向角的集合定义一些有方向的面，再用面的集合定义边界，有一种方法可以从这些边界中得到体积。如果我们设想有体积的对象被分解为四面体的集，那么只要计算四面体的体积总和就可以了。

When we sum on all the tetrahedrons, and by means of a development of the determinant along the first line, we get a sum on determinants on triangles that must be either all oriented towards the interior of each tetrahedron, or all oriented towards the exterior.

当我们计算四面体的总数，通过沿着第一条起决定作用的线，我们获得了起决定作用角的总数，这些角既不是朝着四面体里面，也不是朝着四面体外面。

For wurtzite-type crystal, [Zn-S4]6- and [Zn-S4]6+ with different crystal positions distribute in the form of layers along c axis, where the two layers of tetrahedrons whirl 60 around c axis, so the crystal is mainly like hexagonal cone.

在纤锌矿型晶体中，[Zn-S_4]~(6-)和[Cd-S_4]~(6-)四面体沿c轴呈层状分布，上下两层四面体的结晶方位不同，两层四面体绕c轴旋转60°，晶体的结晶形貌为六方锥状。

It was found that the inorphology ofsulfates is related to the orientation of tetrahedral [SO4]2- in the crystal, i.e., the faces, the edges and faees of the tetrahedra normal to, are expected to grow slowly and observed in final form; in contrast, the faces, the vextices of the tetrahedra pointing to, usually grow fast, and will disappear.

晶体的结晶形貌与[SO4]2-四面体在晶体中的结晶方位密切相关，四面体的面和棱的法线（ L 2）所对向的晶面，生长速率慢，顽强显露，均属晶体的板面；四面体的顶角所指向的晶面，生长速率快，显露面积小，经常消失。

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