查询词典 dodecahedron

Goldberg got a class of polyhedra which are icosahedral symmetry by appending hexagons on regular dodecahedron by rule in 1937. They are called Goldberg polyhedra which provides a new approach for polyhedral molecule design.

1937年，数学家Goldberg通过在正十二面体上有规律地添加六边形面得到一类具有二十面体对称性的多面体，即Goldberg多面体。

However, when occurring in Mesozoic remelted granite, pyrite is featured mainly by high gold content in pentagonal dodecahedron and in its complex; low content in cubic pyrite; Au/Ag ratio between 1-2; both N and P types of pyrite present in most deposits and P type only in a few deposits.

产于中生代重熔花岗岩中时，黄铁矿以五角十二面体居多，五角十二面体及其聚形含金较高，立方体含金性较差；Au/Ag比值在1-2之间，As的含量较高(＞600×10〓)；Co、Ni的含量则较低，一般为10n×10〓；热电性以既有P型又有N型的P、N混合型为特征，少数金矿床表现为单一的P型。

The results show that the fine-grained hypidiomorphic pyrite, with a crystal form of pentagonal dodecahedron, contains more Au than others. Since the areas yield pyrite with relatively lower contents of main components S and Fe, while a greater gross content of trace elements, such as Cu, Pb, Zn, Au, Ag, are closely associated with gold deposits, the authors propose that a middle-scale gold deposit might be found in Zhaojiapuzi area; and there is a remote possibility to find a large gold deposit in Shengjingao area, wih a prospect of finding a concomitant gold deposit.gold deposits;mineralogical.

结果表明以五角十二面体晶形为特征的半自形细粒状黄铁矿含金性较高；黄铁矿主成份S、Fe含量相对低，而黄铁矿中Cu、Pb、Zn、Au、Ag等微量元素总量相对高的黄铁矿分布区城与金矿化关系密切；提出赵家堡子地区具备找到一处中型以上金矿的前景，而在生金皋地区找到大型金矿床的可能性很小，但有望找到伴生金矿床。

Regular icosahedron ; regular dodecahedron ; quasicrystal ; conjugate fractal structural model ; conjugate fractal structural model of quasicrystal ; Penrose pattern ; high resolution structural image by electron microscopy.

正十二面体；正二十面体；准晶体；共轭分数维模型；准晶共轭结构模型； Penrose拼图；高分辨电子显微结构图

It crystallizes in the monoclinic space group C2/c, with a=1.6953(3)nm, b=1.9241(4)nm, c=1.7760(4)nm,β=94.75(3)°. Each Gd ion is coordinated by two oxygen atoms from two different radicals NITPh(OCH3)3 and six oxygen atoms from three hfac molecules to form eight-coordinated dodecahedron geometry.

Gd离子采取八配位的模式，两个氮氧自由基作为单齿端基配体分别以氮氧基团的氧原子与Gd离子配位，三个六氟乙酰丙酮阴离子分别以两个氧原子与Gd离子配位，构成十二面体。

The results indicate that the foamed metals have the structure of dodecahedron with pentagonum casement toward space outspread. The framework self is the tube shape channels, which are cavate and nonentirely sealing. The whole framework is a maze structure connecting by this kind of channels. Folds and hollows besprinkle the surface of foamed nickel skeleton.

结果表明用本文方法制备的发泡金属是一种向空间延伸的具有五边形窗的十二面体结构，发泡金属骨架本身是中空的、非完全封闭式的管状&通道&，整个骨架就是由这种&通道&连接的&迷宫&式的结构。

On the basis of the frame of dodecahedron, we apply the method of "spherical stretching" to the frame, we can obtain a novel polyhedron with I_h symmetry, which contains 72 pentagons.

我们在十二面体框架的基础上，利用&球面拉伸&的方法，得到新的具有二十面体对称性，72个五边形构造的的多面体结构。

Breath, muscle contraction of the buttocks; arch body, as far as possible to hold his head, right leg straight towards the ceiling (peg-leg knee in order to avoid muscle tension).

呼气，收缩臀部肌肉；拱起身体，尽量抬起头来，右腿伸直朝向天花板（膝微屈，以避免肌肉紧张）。

The cost of moving grain food products was unchanged from May, but year over year are up 8%.

粮食产品的运输费用与5月份相比没有变化，但却比去年同期高8％。