十二面体

Under the electron microscope, the virus was circular, icosahedral symmetry and had the non-pouch membrane.

用磷钨酸负染电镜观察，病毒呈圆形、无囊膜，且呈二十面体对称。

The last but not least, it is also owning to the rapid development in computer science and information technology. Such as, some computational task, which previously must be executed by using super-computer, now can be carried out by personal computer, and at the same time, the network speed and band width of data bus and input/output equipment have increased several times. In addition, the improvement of the high quality graphic displaying is available. All these provide strong support for cryoEM high-resolution reconstruction study.

目前，在低电子剂量的情况下，冷冻电镜照片可以记录到3-4 〓的信息，使用冷冻电子显微镜进行高分辨三维重构工作，已经获得6.5-8〓高分辨率水平的结果，可以分辨出蛋白质的α螺旋、识别出蛋白质的β折叠等蛋白质二级结构；其次是，三维重构算法效能的不断提高，使得对二十面体取向和中心参数计算的可靠性大大提高；再次是，由于计算机和信息技术迅猛发展，例如，以往需要使用大型计算机的计算任务已经可以被一般的个人电脑完成，网络速度、数据总线和硬盘等I／O设备的带宽成倍增长，以及图像显示能力的提高都为冷冻电子显微镜高分辨三维重构技术提供了强有力的支持。

Nowadays, in the low electron dose condition, the information about 3-4〓 can be recorded on the cryoEM micrograph, and the high-resolution reconstruction using the cryoEM has reached 6. 5-8〓 levels. The reconstruction can reveal the protein α helical and recognise β fold secondary structure. Secondly, it is due to the development in 3D reconstruction method, which can be more efficient to determine the orientation and center parameters. The last but not least, it is also owning to the rapid development in computer science and information technology. Such as, some computational task, which previously must be executed by using super-computer, now can be carried out by personal computer, and at the same time, the network speed and band width of data bus and input/output equipment have increased several times. In addition, the improvement of the high quality graphic displaying is available. All these provide strong support for cryoEM high-resolution reconstruction study.

目前，在低电子剂量的情况下，冷冻电镜照片可以记录到3-4 〓的信息，使用冷冻电子显微镜进行高分辨三维重构工作，已经获得6.5-8〓高分辨率水平的结果，可以分辨出蛋白质的α螺旋、识别出蛋白质的β折叠等蛋白质二级结构；其次是，三维重构算法效能的不断提高，使得对二十面体取向和中心参数计算的可靠性大大提高；再次是，由于计算机和信息技术迅猛发展，例如，以往需要使用大型计算机的计算任务已经可以被一般的个人电脑完成，网络速度、数据总线和硬盘等I／O设备的带宽成倍增长，以及图像显示能力的提高都为冷冻电子显微镜高分辨三维重构技术提供了强有力的支持。

This is a special state of condensed matter with long-range order that is neither three-dimensionally periodic nor quasicrystalline, but nevertheless possessing a higher degree of organization and higher symmetry than the individual crystals constituting the MTPs.

SEM-EDS分析得到所观察到的二十面体构形的颗粒的成分比B/O是6.4；另外一种四面体结构则有B/O为2，其相应的化学式是B〓O。

In chapter 3, the elastic deformation in icosahedral clusters was calculatedanalytically and a numerical simulation was performed to test the theory.

在第三章，我们解析地计算了二十面体团簇内部的弹性应力与形变分布并利用数值模拟的方法对计算结果进行检验。

By constructing a sphere hexagonal grid system based on the Truncated Icosahedrons Projection, this paper focuses on the study of the address coding mechanism of the sphere hexagonal grids, including the hierarchy coding schemes, the study of the positional relations among the grid units and the mutual conversion between the address codes of the grid units and the geographical coordinates.

本文通过构建基于截顶正二十面体投影的球面六边形网格系统，对球面六边形网格的地址编码机制进行了重点研究，包括网格的层次编码方案、网格单元位置关系研究和网格单元地址码与地理坐标之间的相互转换。

In this thesis, we have studied several kinds of stable icosahedral quasicrystalline alloys in different topics.

本文对几种稳定的二十面体准晶合金系列分别就不同方面进行了研究，主要内容如下

It is found that, reverse to common idea, the short-range is notpreferable for the stability of icosahedral clusters.

我们发现，与通常所认识的不同，短程势并不利于二十面体团簇的稳定。

The principle and method of electron cryomicroscopy and computer three-dimensional reconstruction of icosahedral virus were described in detail, and some improvements were made in this thesis.

本文详细阐述了冷冻电子显微镜技术和二十面体病毒计算机三维重构技术的原理和方法，并对其做了一些改进。

In the second chapter, we discussed the influence of the range of inter-atomic potential on thestability of icosahedral clusters.

第二章我们研究了原子间相互作用势势程对二十面体团簇稳定性的影响。

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