晶簇

In constant acceleration growth, a retard effect of response of eu-tectic interflake spacing on the growth rate has been observed.

在加速生长过程中，共晶相间距对生长速度的响应呈滞后效应，响应机制是共晶Si相成簇分枝和局域"终结"延伸。

Cu6Zr5, the basic cluster of the primary devitrification phase of Cu-based amorphous alloys, is selected as cluster model based the on structure heredity existing between amorphous alloys and primary devitrification phases.

根据非晶与其晶化相存在结构遗传关系，以Cu-Zr基非晶晶化相Cu10Zr7中的Cu6Zr5阿基米德反棱柱为团簇模型，利用离散变分方法从电子层次研究了Al元素对Cu基非晶合金团簇稳定性的影响。

In order to reach the purpose of using pre-laser cladding method preparation of Ni-based amorphous alloy coatings on 45 steel substrate surface by the method was carried out. The principles of the three clusters and the amorphous line of the law of composition rules were used. The Ni59.35Nb34.45Sn6.2 alloying powder which has a great glass-forming ability in conventional preparation methods of amorphous alloys was chosen. In the protection of atmosphere, the amorphous surface coating was prepared. The microstructure, micro-hardness and performance of the different output power of the laser cladding were analyzed.

中文摘要：为了达到研究预置激光熔覆可以在45钢上制备Ni基非晶合金涂层的目的，采用非晶形成能力三判据原则及非晶成分团簇线定律法则，选择了采用常规非晶合金制备方法中具有极大玻璃形成能力的Ni59.35Nb34.45Sn6.2合金粉末，在保护气氛下，制备非晶涂层，并对不同输出功率下得到的涂层进行微观组织和结构表征及性能测试。

The membranes were transformed from amorphous phase toα-Al_2O_3 crystalline phase by 5 hours annealing at 800℃and 910℃. At the same time, aluminum and amorphous alumina were found by XRD patterns. The membrane had little change in front side after 5 hours annealing at 800℃, while the back side was transformed from ruleless distributing to cluster distributing.

膜在800℃及910℃下退火5h后，由非晶态的氧化铝转变成为晶态的α-Al_2O_3，但同时也有铝单质和无定形结构的氧化铝存在，膜在800℃下退火5h后的正面没有太大变化，背面由无规则的分布变为簇状分布。

The results show that as for the as-cast castings, eutectic Si particles are characterized as fibrous or long acicular shape as well as in homogenous distribution, and the impact absorbed energy varies from 1.17 to 2.35J. After T6 heat treatment, the eutectic Si particles become small granular or short bacilliform, and the aspect ratio and area fraction of Si particles decrease evidently. The energy of the T6-treated castings is 1.45-3.80 J, which is higher than that of the as-cast castings. Furthermore, the fracture mechanisms of different regions in the castings were analyzed and discussed.

结果表明：铸态下共晶Si粒子大多为纤维状或长针状，呈不均匀的网状分布，冲击吸收功在1.17~2.35J的范围内变化后；经T6热处理后，团簇状Al-Si共品相明显减少，共晶Si粒子呈现出粒状或短棒状，且细小均匀，Si粒子的长宽比和面积分数都有显著降低，冲击吸收功在1.45~3.80J的范围内变化，比铸态有明显提高。

After T6 heat treatment, the eutectic Si particles become small granular or short bacilliform, and the aspect ratio and area fraction of Si particles decrease evidently. The energy of the T6-treated castings is 1.453.80 J, which is higher than that of the as-cast castings. Furthermore, the fracture mechanisms of different regions in the castings were analyzed and discussed.

结果表明：铸态下共晶Si粒子大多为纤维状或长针状，呈不均匀的网状分布，冲击吸收功在1.17~2.35 J的范围内变化后；经T6热处理后，团簇状Al-Si共晶相明显减少，共晶Si粒子呈现出粒状或短棒状，且细小均匀，Si粒子的长宽比和面积分数都有显著降低，冲击吸收功在1.45~3.80 J的范围内变化，比铸态有明显提高。

It is for the first time found that the liquid hypoeutectic Al-Fe alloy has a critical temperature of 920℃ in the curve of the cluster size to temperature. Below 920℃ the structural change is predominantly in the medium-range order, while in the short-range order above 920℃.

首次发现，亚共晶Al-Fe合金熔体的原子团簇尺寸等在920℃左右存在明显的变化。920℃以下熔体结构的变化以原子团簇尺寸即中程尺度参数的变化为主，而920℃以上则以配位数等短程序参数的变化为主。

Anatomical characters that are of significance are terminal sclereids, druses in epidermalcells, trichomes, brachysclereids in parenchymatous tissues of midribs and petioles, and theshape of midribs and petioles in transverse sections.

有意义的解剖学特征是：末端石细胞，表皮细胞的晶簇，毛状体，在中脉和叶柄的薄壁组织内的短石细胞以及中脉和叶柄横切面的形状。

The numbers of clusters made up of 1551 and 1541 bonded pairs representing the non-crystal structure occupy predominate position and the small numbers of clusters made up of 1431, 1661 and 1441 bonded pairs coexist in the non-crystal system at 4×10〓K/s cooling rate, thus there exist a large number of icosahedra clusters in the non-crystal system. The numbers of clusters made up of 1421 bonded pairs corresponding to the fcc-like structure occupy predominate position and the small numbers of clusters made up of 1422 and 1551 bonded pairs coexist in the crystal system during the 4×10〓K/s cooling process, thus the system can form the regular fcc-like structure.

在4×10〓K/s的冷速下，标征体系非晶结构的五重对称键型1551和1541所形成的小团簇数量在非晶体系中占主导位置，同时还存在少量的1431、1441和1661等其它键型形成的小团簇，这样，体系中含有大量的二十面体团簇结构；在4×10〓K/s的冷速下，标征面心立方结构的1421键型所形成的小团簇数量在晶体中占第一位，同时还存在一定量的1422、1441和1661等其它类型的键对所形成的团簇，体系最终形成面心立方结构。

A systematic analysis of the icosahedral hierarchic structure in the 3D icosahedral quasicrystal and its approximants have been made. There is an icosahedron at the center surrounded by 12 icosahedra. If two neighboring icosahedra are vertex-sharing, the multi-shell Mackay cluster consisting of 127 atoms will form. If two neighboring icosahedra penetrate into each other, the multi-shell Samson-Bergman-Pauling cluster consisting of 137 atoms will form.

系统地分析了三维二十面体准晶的近似晶体相中具有二十面体对称的等级结构，中心1个二十面体，周边12个二十面体，如两个相邻二十面体共顶点连接，得出的是由127个原子构成的Mackay球形原子簇；如两个二十面体互相穿插，得出的是由137个原子构成的Samson-Bergman-Pauling球形原子簇。

Neither the killing of Mr Zarqawi nor any breakthrough on the political front will stop the insurgency and the fratricidal murders in their tracks.

在对危险的南部地区访问时，他斥责什叶派民兵领导人对中央集权的挑衅行为。

In fact,I've got him on the satellite mobile right now.

实际上 我们已接通卫星可视电话了