六角形

Looking back of World Cup balls through the years, the first from Adidas that was the official World Cup ball, the black-and-white speckled sphere divided into 32 hexagons, the Telstar, carries an interesting story.

回顾历届世界杯使用的球，爱迪达首次设计的世界杯官方足球，是由32块黑白相间的六角形嵌面组成的球体，取名Telstar，其中有个有趣的插曲。

The very first collection we made, a square case, a choice of stainless steel bracelet, leather strap, different colors of dials and plating, in this collection fulfills specific need and neutral style expectations reflecting the sophisticated design of watchmaker's craft, 4 pieces of decorative screw in hexagon match with a same facet of crown, Quartz (citizen 1L12), water resistant to 50 metres.

我們首先推出一款方形系列，有不同配搭的選擇，如鋼帶，皮帶，不同顏色的錶面及電鍍，確實滿足到特定的需要，以及中性的要求，這反映出不落俗套的，精緻的工藝設計，有以4棵六角形裝飾鏍絲，配襯相同面的巴的，石英錶(citizen 1L12机芯)防水達50米深。

In Chapter 6, we show that H(G_1)= H(G_2)= x~2(x + 1)~2H_3(G_1 - H_3(G_2), H_2(G_1)- H_2(G_2)=(x~2 + x - 1)~2H_3(G_1 - H_3(G_2) and H_(23)(G_1)-H_(23)(G_2)= 2(x~2+x -1) H_3(G_1—H_3(G_2) for arbitrary catacondensed benzenoid graphs G_1 and G_2 with equal number of hexagons.

在第六章中我们证明了：对于任意的有同样多六角形的cata-型苯系统G_1和G_2，有H(G_1)-H(G_2)=x~2(x+1)~2H_3(G_1-H_3(G_2)，H_2(G_1)-H_2(G_2)=(x~2+x-1)~2H_3(G_1-H_3(G_2)和H_(23)(G_1)-H_(23)(G_2)=2(x~2+x-1)H_3(G_1-H_3(G_2)。

At the centre of the macula is the foveal pit where the cones are smallest and in a hexagonal mosaic, the most efficient and highest density.

斑点中心的中心窝的视锥细胞最小，它们排列成六角形。

Triangle lens is best in uniformity, and hexangular lens has better light collecting efficiency.

利用三角形积分透镜可以获得最佳的照明均匀性，但光能利用率相对较低，六角形积分透镜可同时获得较高的照明均匀性和光能利用率。

In part two, the optical spatiotemporal pattern in ring optic cavity is investigated. Using delay feedback with spatial perturbation method, the system shows roll, square, hexagon, homocentric circle,"honeycomb"and"snowflower" pattern with different spatial perturbation functions. Different patterns can be coexist and compete each other with the same perturbation function, which is the new character of this optical system with delay feedback.

第二部分，利用延时反馈的空间微扰方法研究了环形腔中二能级介质的光学时空斑图的控制，在不同的微扰函数作用下，出现了滚筒状、四方形、六角形、蜂窝状、同心圆以及&雪花&状等不同的斑图，并且在相同的微扰函数下出现了不同斑图之间的竞争，这种竞争是我们发现的这一具有空间微扰的延时反馈非线性光学系统光学斑图的新特征。

METHODS: Ahmed glaucoma valves were implanted in 34 eyes of 34 patients with refractory glaucoma. Density and morphology of corneal endothelial cells were evaluated in the superotemporal, superonasal, infratemporal, infranasal, and central corneal areas to calculate mean value of total cornea before and at 3 and 6 months after surgery. Percentage of hexagonal cells was statistically summarized.

在34例(34眼)疑难青光眼患者眼球颞上象限行Ahmed青光眼阀植入，移植前及移植后3，6个月对角膜中央、颞上、颞下、鼻上及鼻下区内皮摄像后测定分析，得出角膜内皮细胞密度，并取全角膜平均值，同时观察角膜内皮细胞形态变化，统计六角形细胞所占比例。

Based on proposed m odel, the code TPHEX-A is implemented. Tested are some hexagonal LWR assembly proble m s. The calculated results are compared with those obtained from the MC method an d DRAGON code.

根据提出的模型，编制了TPHEX-A程序，并对一些轻水堆六角形组件问题作了计算，计算结果与DRAGON程序计算结果以及MC结果进行了比较，符合较好。

Principle of least squares,digital image segmentation,digital image treatment and digital image identifying were applied into the research of wood science in this research,the wood cell image of annual ring from annual center to wood edge was analyzed,the modified level set method was applied to segmentate cell image precisely for the first time,the identifying of wood cells and hexagon simulation for wood cells were accomplished with active contour model,which had important potential application value in deepening the research of wood properties to a further step,moreover,had an important significance for improving comprehend on wood micro-properties and enlarging the applicable range of wood.

本研究将最小二乘原理、数字图像分割、数字图像处理、数字图像识别应用于木材科学研究，分析了从年轮中心到木材边缘的年轮的木材细胞图像，应用改进的水平集方法准确分割细胞图像，应用活动轮廓模型完成了对木材细胞的识别，并完成了木材细胞六角形仿真，对木材材性的深入研究等领域中有重要的潜在应用价值，对提高木材对微观性能认识，扩大木材的适用范围，具有重要意义。

The most impressive one is that I've hand sharpened the edges so that it presents a period edge geometry, instead of the original thick secondary bevels from the swordsmith.

而在向剑尖的一半，则呈扁六角形，以增加在斩击位置的剑锋支撑力，以及剑侧抵抗侧向压力的能耐，使其不论攻击与防守，皆能应该战场上的需要。

On the other hand, the more important thing is because the urban housing is a kind of heterogeneity products.

另一方面，更重要的是由于城市住房是一种异质性产品。

Climate histogram is the fall that collects place measure calm value, cent serves as cross axle for a few equal interval, the area that the frequency that the value appears according to place is accumulated and becomes will be determined inside each interval, discharge the graph that rise with post, also be called histogram.

气候直方图是将所收集的降水量测定值，分为几个相等的区间作为横轴，并将各区间内所测定值依所出现的次数累积而成的面积，用柱子排起来的图形，也叫做柱状图。