四边形

A key problem is: is it true that the supremum of the ratios of the moduli of quadrilaterals equals to the extremal maximal dilatation?In this chapter, firstly, for a class of quasisymmetric homeomorphisms with substantial boundary points, we apply a result of Chen Jixiu etc.

在第二章中，我们首先利用了文[16]的结果，研究了单位圆周上一类具有本质边界点的拟对称同胚，证明了它的极值拟共形延拓的最大伸缩商等于四边形模之比的上确界，改进了文[128]的有关结果。

Through studying two pairs of opposite vertices in tetragon, the author derived the curve equation of focus in form of complex number and its expression of right angle coordinate.

从研究四边形的两对对顶点出发，推导出复数形式的焦点曲线方程及其直角坐标表达

Based on the structural relationship of quadrilaterals on a scalp and the interpolation of texel starting vectors, we further modify and improve the simple hair styles.

然后根据头皮曲面上四边形的结构关系和纹元起始向量的插值方法，将简单造型予以修正和发展，给出几个发型的构造方法和实例。

They are hydrogen and sulfur gases heated by intense ultraviolet radiation from the Trapezium's stars.

它们是被"猎户座四边形"发出的强烈紫外线加热的氢和硫的气体。

These organic molecules have been illuminated by the Trapezium's stars, and are shown in the composite as wisps of red and orange.

这些有机分子受四边形的射线辐射而发光，在图中为一缕一缕的红色和橙色色带。

The stars are called the Trapezium because they are arranged in a trapezoid pattern.

这四颗星被称为"猎户座四边形"。

The bright central region is the home of the four heftiest stars in the nebula. The stars are called the Trapezium because they are arranged in a trapezoid pattern.

图中明亮的中心区域是星云中四颗成熟的恒星，他们组成了一个梯形，我们称之为猎户座四边形。

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。

The characteration of 15 will may provide a new pathfor searching new triboluminescent complexes. The triboluminescence maximum of 15is similar to that of its photoluminescence. The disorder of the thienyl rings and 〓groups in 15 may be responsible for its triboluminescent activity.

Eu的距离为4.2137(9)〓。两个桥联O原子与两个Eu构成一平面四边形，∠Eu(1)-O(7)-Eu(1A)和∠O(7)-Eu(1)-O(7A)分别为117.84(14)°和62.18(14)°。15的摩擦发光光谱与其光致发光光谱很类似，表明它们有相同的激发态。15的摩擦发光活性可能与其结构中噻吩环及〓的无序有关。

Tringle Quadrilateral hexagon octagon and cireular flat shape can be formed. Cambered net shell can have the form of cylinder, olive, ball, etc.

可构成三角形、四边形、六边形、八边形和园形等多种平面形状；曲面网壳则可以构成园筒形，橄榄形、园球形等任意形状。

The labia have now been sutured together almost completely.The drains and the Foley catheter come out at the top.

此刻阴唇已经几乎完全的缝在一起了，排除多余淤血体液的管子和Foley导管从顶端冒出来。

To get the business done, I suggest we split the difference in price.

为了做成这笔生意，我建议我们在价格上大家各让一半。