四角

The calculated results show: the ground state structures of PtNi5, Pt2Ni4 and Pt3Ni3 clusters are quadrangular bi-pyramid, and Pt4Ni2 and Pt5Ni clusters are triangular bi-pyramid with hat and triangular pyramid with quadrilateral, respectively. From the point of view of thermodynamics, PtnNim clusters are stable because of the negative enthalpy of formation; the positive NICS of PtNi5 clusters show anti-aromaticity, The negative NICS of Pt2Ni4 and Pt5Ni clusters show aromaticity. The number of the IR absorption peak of Pt3Ni3 is the most. The IR and raman absorption peak of PtNi5 , IR of Pt2Ni4, Raman of Pt3Ni3 and Pt4Ni2 have only one. The absorption peak of Pt5Ni appears in the bigger frequencies only, and is zero almost in the small frequencies.

研究结果表明：PtNi5、、Pt2Ni4、Pt3Ni3团簇的基态结构都为四角双锥结构，Pt4Ni2 和Pt5Ni团簇的基态结构分别是戴帽三角双锥和三角锥戴四边形结构；PtnNim团簇的生成焓都为负值，表明团簇在热力学上是稳定的；由NICS值可得，PtNi5团簇具有反芳香性，Pt2Ni4和Pt5Ni团簇具有芳香性；从光谱分析来看，Pt3Ni3团簇的IR较强吸收峰的个数最多，PtNi5团簇的IR和Raman、Pt2Ni4团簇的IR、Pt3Ni3和Pt4Ni2团簇的Raman只有一个强吸收峰值，Pt5Ni团簇的峰值只出现在频率较大的位置，频率小的位置几乎为零。

According to the case of billet heating in a regenerative type heating furnace, the temperature distributing of billet about upper surface, undersurface and center surface in length and width is studied by computational fluid dynamicsin this article, and the questions of billet such as different temperature of upper surface and undersurface, the higher temperature of foursquare margin and the lower temperature of tapping orifice are put forward.

中文摘要：借助CFD仿真手段，模拟蓄热式加热炉内钢坯加热的实际状况，研究了钢坯长度、宽度方向上下表面和中心温度的温度分布，提出钢坯存在上下温差、四角边缘温度高和靠近出钢口钢坯温度低等问题。

A suit of software used for boiler's cold and hot tests is developed by EXCEL 2000 and VB6.0, which can process all the data and cartography during the tests. The software can print test report in a certain extent. Many universal ActiveX control and Class are developed. The experiences on the software are summed up. At last, the direction of the software's development used for boilers' tests is forecasted.

依据试验原理与方法，以 Excel 2000和 VB6.0为开发工具，开发了一套针对四角切圆燃烧锅炉的冷、热态性能试验通用计算软件，该软件能够完成试验过程中所有数据的处理和图表、曲线的绘制，并具有一定的报告自动打印功能；制作了可通用的 ActiveX 控件和类，并对软件开发的经验进行了总结；最后，对锅炉性能试验软件的未来发展趋势进行了展望。

For the wall Xiangtie be best to replace a small hammer, gently tap the wall, floor tiles and the middle of the corners, under normal circumstances there should be no hollow sound.

对于墙砖镶贴，最好能用一个小锤，轻轻敲打墙、地砖的四角与中间，正常的情况下不应该有空洞声音。

Sense, it also reflects the shape curve extraordinary classically elegant conference, the most prominent feature is the 1.4 with one foot bathtubs bottom, like a giant flowerpots; Ramps and special mouth design, high-mouth part of it back to the bath, a very close sense; color than ordinary bathtubs rich easy choice, and wall and floor tiles in the area making it more flexible.

除了材料上的古旧感，它的造型曲线也体现了非凡的古雅柔美，最突出的特色就是浴缸底层的四角各有一只脚，就像个巨型花盆；而特殊的斜口设计，使浴缸高口部分便于靠背，十分具有亲近感；色彩上比普通浴缸丰富，便于选择，与墙砖和地砖的配合方面更显灵活。

A four-corner mounting system holds the Kindle in place and a detachable wristlet strap allows for easy transporting without disrupting the luxury feel.

阿四角安装系统拥有的地方点燃和可拆卸的护腕带，方便豪华的感觉，而不必中断允许运送。

The product is rectangle, amomum cake, thickness.

成品的砂仁糕呈长方形，四角周正，厚薄一致。

Magic number CoGe10(superscript -), CoSn10(superscript -) and CoPb10(superscript -) may have bi-capped tetragonal antiprism structure and CoPb12(superscript -) is icosahedral structure.

幻数离子CoGe10、CoSn10和CoPb10可能具有双帽四角反棱柱结构，而CoPb12可能具有二十面体构型，钴原子均为笼状结构的中心。

A rearrangement model for the complex and its isomers of the2+ was proposed, in which there could be two competed steric courses with the trigonal bipyramidal intermediate or intermediates.

利用[Co(3，3-tri)Cl]2+体系配合物及其异构体结构模型提出了一个2+型的配合物及其几何异构体相互转换所遵循的重排机理模型。认为在该类型配合物异构体转化过程中同时存在两个竞争途径，其中间过渡态或中间体分别为三角双锥或四角锥形式。

Base-catalysed hydrolysis is a typical course involving deprotonation leaving of Cl- and formation of the trigonal bipyramidal intermediate; edge displacement and ligand folding courses involve leaving of Cl- and formation of the square pyramidal intermediates.

典型的途径有经式异构体的碱催化水解，过程通过脱氢、脱氯以及三角双锥中间过渡态或中间体的形成来完成；另一途径为边沿取代及配体翻转历程，过程通过脱氯及四角锥的形成来完成。

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。