查询词典 clusters

Astronomers made observations of Cepheid variable stars— pulsating stars used to measure vast distances— in the Virgo and other clusters to establish the expansion rate and the universe's age.

天文学家用哈勃观测到仙女星座和其它星群中的造父变星以确定宇宙的膨胀速度和宇宙的年龄。

Astronomers made observations of Cepheid variable stars —pulsating stars used to measure vast distances—in the Virgo and other clusters to establish the expansion rate and the universe's age.

天文学家用哈勃观测到仙女星座和其它星群中的造父变星，以确定宇宙的膨胀速度和宇宙的年龄。

Astronomers made observations of Cepheid variable stars —pulsating stars used to measure vast distances—in the Virgo and other clusters to establish the expansion rate and the universes age.

天文学家用哈勃观测到仙女星座和其它星群中的造父变星，以确定宇宙的膨胀速度和宇宙的年龄。

In this paper, the chemisorption of energetic C〓 and C〓 clusters on diamond (001)-(2×1) surface was investigated by molecular dynamics simulation.

本文，研究了荷能的C〓和环状C〓团簇在金刚石（001）-（2×1）表面的化学吸附过程。

The chemisorption of CO on platinum clusters was treated by EHMO method.

本文用EHMO方法对CO在Pt原子簇上的化学吸附进行了量子化学计算。

The research on N_4 to N60 have been also stated in this study. Gas reaction method, liquid electrolyzing method and Chemosynthesis method have been used to synthesize polynitrogen clusters and find the optimal reaction conditions in this paper.

本文综述了高能密度材料的发展历史、性能特征以及应用前景，并总结了人们在实验和理论两方面关于N_4到N_(60)的各种可能稳定存在的氮原子簇的研究成果。

This paper is focused on the preparation, characterization of metal clusters and theircatalytic performance in the enantioselective as well as stereoselective hydrogenations. It iscomposed of the five parts as follows: Chapter 1 A review was given on the two most studied enantioselective systems—Ni/TA and Pt/cinchona system, including some recent progress.

本论文研究了铂、铱纳米金属簇在α-酮酯、α-二酮不对称氢化中的催化性能及金属离子在α-二酮立体选择性氢化中的修饰作用，主要分为以下几部分：第一章对多相不对称催化体系一Ni／TA和Pt／cinchona及其一些最新进展作了较系统的评述；同时简要介绍了纳米金属簇的特性及其在催化中的一些应用。

As well as activity was exhibited. Theaddition of cinchonidine led to a remarkable increase in the reaction rate, as confirmed bythe IR study that the modifier activates the carbonyl groups of the reactant through itsquinuclidine nitrogen. On the contrary,〓 exerted a strong inhibition effect on theenantioselective hydrogenation. Chapter 3 Finely dispersed polyvinylpyrrolidone-stabilized iridium andbimetallic clusters were prepared by the alcohol-water reduction method.

第三章 采用醇水还原的方法制备了聚乙烯基吡咯烷酮稳定的铱纳米簇及双金属纳米簇，对丙酮酸甲酯的催化氢化表明，在铱金属簇催化体系中，辛可尼定不仅诱导了一定的对映选择性，同时对反应活性有明显的促进作用，平均反应速率可提高2-6倍。

The random, looped animations of fish swimming in the sky were also made in CINEMA 4D before being duplicated with MoGraph's Cloner Object and repositioned to create small clusters.

鱼在天空-任意的游动，是循环-画在进入CINEMA 4D和MoGraph之前就先克隆出来，这样创-出了小群的鱼。

For very large clusters, there is competition between the face centered cubic octahedra and the hexagonal close-packed structures.

在团簇尺寸很大时，Fcc-oct结构和Hcp结构占优势，二者相互竞争。

However, as the name（read－only memory）implies, CD disks cannot be written onorchanged in any way.

然而，正如其名字所指出的那样，CD盘不能写，也不能用任何方式改变其内容。

Galvanizes steel pallet is mainly export which suits standard packing of European Union, the North America. galvanizes steel pallet is suitable to heavy rack. Pallet surface can design plate type, corrugated and the gap form, satisfies the different requirements.

镀锌钢托盘多用于出口，替代木托盘，免薰蒸，符合欧盟、北美各国对出口货物包装材料的法令要求；喷涂钢托盘适用于重载上货架之用，托盘表面根据需要制作成平板状、波纹状及间隔形式，满足不同的使用要求。