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The empty p orbital and the occupied σorbital by a lone electron pair of carbene point towards H atom and C atom of the C—H bond respectively.

卡宾空的p轨道和占有一对孤电子的σ轨道分别指向C—H键的H原子和C原子。

The X-ray crystal structure reveals that thiourea coordinates with Pd via S atom,and the complex as a whole was in complete symmetry with palladium atom at the symmetry center of the plane square structure.

硫脲是有效反萃剂，从萃合物的晶体结构看出，硫脲通过S原子与Pd配位，萃合物以Pd原子为中心构成平面正方型结构。

This invention discloses an intermolecular charge transfer chromogen with triphenylamine group, with a formula indicated by (1), wherein: R1 is hydrogen atom or methyl group or methoxyl group, R2 is hydrogen atom or 2-(5,5-dimethyl-3-vinylcyclohexenyl-2-enylidene)propanedinitrile group.

本发明公开的含三苯胺基团的分子内电荷转移生色团，具有式1所示的结构式，其中R 1 为氢原子或甲基或甲氧基，R 2 为氢原子或2-(5，5-二甲基-3-乙烯环己烯基-2-烯亚基)丙二腈基。

All of these results confirmed that the quenching effect of sulfur atom. The distance between sulfur atom and chromophore played an important role in the self-quenching effect.

通过实验，进一步证实了硫原子对发光基团的荧光淬灭作用，说明二硫代酯与发光基团之间的距离对硫的荧光淬灭作用有很大的影响。

We study dynamics of the hydrogen atom near a metal surface using the closed orbit theory, and discuss its changes of properties with the varying of the distance d between the atom and metal surface.

采用闭合轨道理论研究了近金属表面里德堡氢原子的动力学性质，讨论了氢原子电子的运动性质随原子与金属表面距离d变化的情况。

The micro movement of deposited cluster and the microstructure evolution of thin film have been studied in dimension of atom-cluster in this paper. There are some important applications to do deeply research on the migration, coacervation and nucleation of atom cluster, to optimize the deposition process, to enhance the characteristics of thin film.

在原子尺度上揭示膜层形成初期粒子的微观变化过程及膜层微观结构的演化规律，对深入了解表面粒子的迁移、吸附和成核，对改进和优化薄膜生长工艺、提高薄膜质量、改善薄膜性质具有重要意义。

The coordination number of the central atom in a compound is the number of atoms which are directly linked to the central atom.

化合物中中心原子的配位数是指直接与中心原子相连接的原子的数目。

How is Thomson's model of the atom different from Dalton's model of the atom?

汤姆生的原子模型和道尔顿的原子模型有什么区别？

A molecular dynamics simulation was utilized to study Al-Cu alloy nanowires for obtaining mechanical properties and deformation mechanisms by changing the ratio of Al atom to Cu atom.

使用分子动力学方法模拟Al-Cu合金纳米线的拉伸变形，通过改变原子比例来控制纳米线的机械性能和变形机制。

The oxidation number of an element in any chemical entity is the charge which would be present on an atom of the element if the electrons in each bond were assigned to the more electronegative atom.

氧化数是指某元素一个原子的电荷数，这种电荷数由假设把每个化学键中的电子指定给电负性更大的原子而求得。

Objective:To explore the feasibility of laparoscopy in diagnosing and treating of abdominal diseases.

目的：探讨腹腔镜用以诊断腹部外科疾病及选择治疗方案的可行性。

The lifetime of nylon 1010 and nylon 1010/POSS composites decreased with increasing temperature.

热重-红外联用分析表明尼龙1010在氮气气氛下的降解产物主要为小分子的低聚物，POSS并不改变尼龙1010降解产物的组成。