四面体

The problem is a bit different for volumes because the tetrahedron decomposition is only useful for volume calculations.

这个问题与体积的问题稍有不同，因为四面体分解只对计算体积才有用。

Later , to confirm our analysis, the Ⅰorder tetrahedron mesh was converted to Ⅱorder and reanalyzed.

后来，为了证实我们的分析，为四面体网格Ⅰ转化为Ⅱ秩序和重新分析。

It is a common knowledge in shape optimization that second order solid tetrahedron elements give good stress results but are not so good for shape optimization.

这是一个常识的形状优化的二阶坚实的四面体分子提供良好的压力的结果，但没有那么好了形状优化。

A typical model consisted of more than 1000 tetrahedron elements, with stress/strain results obtained by use of a NASTRAN solver.

一个典型的模型构成的1000多个四面体元素，与应力/应变所取得的成果用一个Nastran的求解。

We have also successfully synthesized Pt nanoparticles of different shapes such as tetrahedron and cube by fasten silicon at room temperature.

我们同时成功的在室温下，合成了不同形状的奈米铂，如四面体和立方体在矽基板上。

In this so-called "fire tetrahedron", heat breaks the chemical bonds of the fuel's hydrocarbon chains.

在这个所谓的"燃烧四面体"中，热量打破了燃料的烃链上的化学键。

The triangle and tetrahedron optimization methods were developed for the selection of back-ground electrolyte in capillary zone electrophoresis.

建立了两种高效、快速的毛细管区带电泳背景电解质的优化方法三角形优化法和四面体优化法。

The solid finite element model of the knuckle has been built using a second order solid tetrahedron element.

这一坚固的转向节模型是由坚固的二级四面体单体元素做成的。

The changes of silicate tetrahedron of fly ash in the process of mechanical grinding were analyzed by trimetheylsilicane.

采用三甲基硅烷化分析技术，研究了粉煤灰机械研磨过程中硅氧四面体结构的变化趋势。

According to the H NMRstudy, it was found that the protons on the cyclopentadienyl ring of 〓 were not splitted, but when one proton on the cyclopentadienylring was substituted by methyl, that is in〓 complexes, thefour protons on the ring were splitted into four groups,the 〓 between the onesignal and the others is large, the total splitting is over 2ppm. The splittings werealso affected by the halides linked with the titanium, they increase according to theorder of CI, Br, I. By the study of the 〓 Sn NMR, it is found that the chemicalshifts of 〓 are present in low field. It is assume that the large space strain causesthe angles of the tin linked with ligands deviate from the normal tetrahedral anglesresults low field shift for 〓Sn. And by MS study,there were no molecular ions for 〓 complexes in the spectra. However, for 〓 when X=CI,Br,NCO and Ar is tolyl or phenyl group,there were molecular ions,but theirabundances were very small,and no that for the iodide was found.

钛上的卤素对茂环氢的裂分也有影响，依〓，Br，I顺序，卤素对茂环氢的裂分依次加大；通过对〓的研究发现，以上这些化合物〓的化学位移都出现在低场，认为大的空间张力造成的锡的键角偏离正常的锡的四面体键角是造成〓化学位移出现在低场的原因；对这些化合物质谱的研究发现，〓系列化合物得不到分子离子峰，而〓系列的化合物，当X=〓，NCO和苯环上不带取代基或只带甲基时，则出现分子离子峰，但丰度很低，而相应的碘化物和其它化合物则没出现分子离子峰。

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。