四面体

But it is not an easy task to directly extend the linear triangle geometric inequality to the n-simplex, thus there are many geometric inequalities worthing exploring and researching when we extend the linear geometric inequality to the tetrahedron and the n-simplex.

而三角形中的某些线性几何不等式直接推广到维单形并不是一件容易的事，因而在推广到四面体中乃至维单形时还有许多几何不等式值得探讨和研究。

An easy task to directly extend the linear triangle geometric inequality to the n-simplex, thus there are many geometric inequalities worthing exploring and researching when we extend the linear geometric inequality to the tetrahedron and the n-simplex.

而三角形中的某些线性几何不等式直接推广到维单形并不是一件容易的事，因而在推广到四面体中乃至维单形时还有许多几何不等式值得探讨和研究。

To satisfy the requirement of different users, a three-phase four-leg circuit topology inverter is investigated to balance output voltage. The transfer functions and system transfer functions matrix are deduced. Three-dimensional space voltage vector modulation strategy is analyzed. The triangular prism judgment, the tetrahedron discrimination and computational methods of space vector action time are discussed.

推导了三相四桥臂逆变器的传递函数，建立了系统传递函数矩阵；分析了三维空间电压矢量调制策略，给出了三棱柱判断、四面体的区分、各个空间矢量作用时间的计算方法，并进行了仿真和实验研究。

Physicists at New York University and Virginia Tech have carried out a series of experiments and, among all the shapes they have tested so far, the tetrahedron (a pyramid with four triangular sides) takes some beating.

纽约大学和佛吉尼亚理工大学的物理学家进行了一系列的实验，在他们到目前所测试的形状中，四面体优势明显。

As an analogy, we might say that our trichromatic color vision can be represented in a triangle, whereas their tetrachromatic color vision requires an additional dimension, giving a tetrahedron or triangular pyramid.

让我们做个类比，如果用一个三角形来代表人类的三色色觉，那麽鸟类的四色色觉就需要多一个空间维度来代表，得到的就是四面体或三角锥体。

Without considering the EM effect and using the generalized variational structure principle, It can get the corresponding variational structure equation.

通过用四面体单元和三棱柱单元对大地模型进行剖分、插值、总体集成，最后解方程，实现了在水平地形和起伏地形条件下频率域激电参数的正演模拟。2。

If Fe +3 is absent in the tetrahedral site,the reddish brown is formulated to maximize the redness relative to the yellowness.

如果Fe3+尽量少地占据四面体间隙位，则出现制出红色值对黄色值之比趋向极大的红棕色。

There is an allotropic change temperature (1155K) for pure Ti and it is a hydrogen-absorbing metal for different solubility in a-phase titanium and 3-phase titanium. The hydrogen atom dissolves in lattice and occupies tetrahedron interstitial position, and then forms TiH2 sublattice of face-centered cubic.

钛是－种具有同素异型转变点T(1155K)的吸氢金属，氢在α钛和β钛中有不同的溶解度，在T以下易形成具有面心立方晶格结构的TiH2，氢原子溶解在晶格中，占据四面体间隙位。

One of the major problems,however,remains the poor solubility and membrane permeation of pepstatin, as well as its lack of selectivity among aspartyl proteases.The amino acid statine can mimic the tetrahedral transition-state of amide bond hydrolysis but cannot itself be hydrolyzed by the enzyme.

分子中含有两个非天然氨基酸statine能模拟天冬氨酸蛋白酶底物活性部位的四面体水解过渡态，且本身不易被切割，通过氢键和酶的天冬氨酸残基结合。

Binuclear dimmer and tetrahedron of Zn and Yb〓O〓 cubane assembled by hydrogen bond structures were obtained.

上述配合物分别具有双核二聚体结构以及氢键组装的Zn四面体和Yb〓O〓立方烷结构。

The split between the two groups can hardly be papered over.

这两个团体间的分歧难以掩饰。

This approach not only encourages a greater number of responses, but minimizes the likelihood of stale groupthink.

这种做法不仅鼓励了更多的反应，而且减少跟风的可能性。