十面体

Spessartine showing oscillatory growth of the rhombic dodecahedron and the trapezohedron.

表现出在菱形十二面体和偏方三八面体之间摆动生长的锰铝榴石。

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。

We obtain three classes of polyhedra which have high symmetry. they are regular tetrahedral class belonging to tetrahedral group , regular hexahedral class and regular octahedral class belonging to octahedral group.

本文将Goldberg在正十二面体上构筑多面体的方法推广到其它柏拉图多面体上，分别得到了三类具有较高对称性的多面体：属于四面体群的正四面体类和属于八面体群的正六面体类、正八面体类。

The error model identification of accelerometers on a azimuth strapdown platform system is also concerned in the dissertation. The composite 14 position test plan of the regular hexahedron and octahedron is provided, and identification results are obtained by using improved progressive regression algorithm.

本文实验研究了方位捷联平台系统加速度计误差模型辨识方法，根据最优试验设计理论设计了正六面体和正八面体组合十四位置试验计划，并用改进的逐步回归算法给出了辨识结果。

Located in the prospecting lines Nos.47 and 37-33 on the middle 270m section, the mineral typomorphic characteristics are as follows: pyrite possesses the combination of octahedron with pyritohedron, pyritohedron with octahedron, etc It appearsas hole-centre and mix center conduction, if being electron-centre conduction, the absolute magnitudes of thermoelectromotive force and thermoelectromotive coefficient of pyrite are bigger relatively; pyrite contains Cu; the relative absorbency in quartz D(subscript H2O0.9403, D(subscript CO2)0.1961, D(subscript CO2)/D(subscript H2O)0.2591 in prospecting lines 37-33 is smaller than average D(subscript H2O1.3267, D(subscript CO2)0.3090, D(subscript CO2)/D(subscript H2O)0.338 2 in the deposit.

江西茅排金矿区270m中段47勘探线及37~33勘探线的矿物标型特征为：黄铁矿形态见有八面体和五角十二面体，五角十二面体和八面体等聚形；出现空穴心型导电和混合型导电黄铁矿，若为电子心型导电黄铁矿，其热电动势和热电系数的绝对值相对较大；黄铁矿成分中检测出Cu；石英相对吸光度（37~33勘探线）D(下标 H2O)0.9403，D(下标 CO2)0.1961，D(下标 CO2)/D(下标 H2O)0.2591，略低于矿区研究样品的平均值D(下标 H2O1.3267，D(下标 CO2)0.3090，D(下标 CO2)/D(下标 H2O)0.3382。

Well-aligned nanoscrews are single crystals grown along the c-axis, with 18 sides on their heads but six concaves on their stems, while the whole is six-fold symmetry.

定向生长的纳米螺杆呈单晶态、c轴择优取向生长，且具有头部十八面体茎部六面体的结构。

When citrate ions were introduced to manipulate the nucleation and growth process, star-shaped icosahedra and nanorods with pentagram cross-sections were obtained.

通过向溶液中引入柠檬酸离子调控纳米颗粒的成核与生长过程，我们首次合成出了星状钯二十面体和截面为五角星形的钯纳米棒。

When citrate ions were introduced to manipulate the nucleation and growth process, star-shaped icosahedra and nanorods with pentagram cross-sections were obtained.

通过向溶液中引入柠檬酸离子调控纳米颗粒的成核与生长过程，首次合成出了星状钯二十面体和截面为五角星形的钯纳米棒。

We obtain three classes of polyhedra which have high symmetry.

本文将Goldberg在正十二面体上构筑多面体的方法推广到其它柏拉图多面体上，分别得到了三类具有较高对称性的多面体：属于四面体群的正四面体类和属于八面体群的正六面体类、正八面体类。

A great number of viruses' capsid proteins are efficient assembly into icosahedral symmetry structures. The capsid structures obey the quasi-equivalence theory of Caspar-Klug, and they are directly composed of pentagons and hexagons.

摘 要 绝大多数病毒的衣壳蛋白装配成二十面体对称的结构，其衣壳结构遵从 Caspar-Klug 的准等价原理，即是由五边形和六边形直接拼接而成的几何构型。

It has been put forward that there exists single Ball point and double Ball points on the symmetrical connecting-rod curves of equilateral mechanisms.

从鲍尔点的形成原理出发，分析对称连杆曲线上鲍尔点的产生条件，提出等边机构的对称连杆曲线上有单鲍尔点和双鲍尔点。

The factory affiliated to the Group primarily manufactures multiple-purpose pincers, baking kits, knives, scissors, kitchenware, gardening tools and beauty care kits as well as other hardware tools, the annual production value of which reaches US$ 30 million dollars.

集团所属工厂主要生产多用钳、烤具、刀具、剪刀、厨具、花园工具、美容套等五金产品，年生产总值3000万美元，产品价廉物美、选料上乘、质量保证，深受国内外客户的青睐