查询词典 electron pair

This paper analyzes shell electron pair repulsion theory, valence-bond theory and molecular orbital theory on molecular structure of noble gas compounds.

对稀有气体化合物的分子结构分别用"价层电子对互斥理论"、价键理论"和"分子轨道理论进行了分析处理。

First, we have developed a multi-reference configuration interaction method based on the separated electron pair wave functions, SEP-CI approach, as an approximation to the traditional CASSCF method.

一，我们发展了基于隔离电子对波函数的组态相互作用方法，这是一种新的多参考态电子相关方法。

Another is the Lewis definition (also 1923): An acid is a chemical that can accept an electron pair from a base, which they share to form a covalent bond.

另一种理论是路易斯理论(也是在1923年发表)：酸就是能由碱接受一个电子对形成一个共价键的化学物质。

It is demonstrated that living polymerization can be achieved when the concentration of electron pair donors such as DMAB or Et3N is higher than that of trace water in the polymerization system,and that polymers with narrow molecular weight distribution can be obtained.

发现当N，N-二甲基苯胺或三乙胺的浓度稍高于质子性杂质的浓度时，即能实现异丁烯的活性聚合，得到分子量分布较窄的聚合物。

The main content is concerned with the following aspects:(1) It discusses the electric-optical effect in the theory about the interaction of γ-rays and materials, Compton effect and electron pair effect and the functional relationship between the three basic effects and γ-rays energy and atomic number, thus laying the foundation of dual energy γ-rays transmission method.

主要内容有如下几个方面：(1)讨论了γ射线与物质相互作用理论中的光电效应、康普顿效应和电子对效应，以及这三个基本效应与γ射线能量和物质的原子序数之间的函数关系等问题。由此构成了双能γ射线透射法的基础。

"In chelates, the ligand attaches at more than one point, sharing more than one electron pair, and is called bidentate or polydentate-having two or many " teeth .

在螯合物里，配位体连接在不止一个点上，它们共享一个以上电子对，称为「双齿配位体」或「多齿配位体」，表示说有两个或许多个「牙齿」。

If under ideal conditions, one electron-hole pair injected yields one blue photon and the quantum efficiency of the phosphor equals one, the numbers of electron-hole pair must equal to the numbers of white photons. So LW white LED radiation power output has to consume 1.51 W electric powers and the luminous flux efficiency limitation of electrical to optical conversion for the white LED is 197.8lm/W at above condition.

在理想情况下，注入一个电子－孔穴对产生一个蓝光光子，设荧光粉的量子效率为1，因此，注入的电子－孔穴对数亦等于白光光子数，进而计算出白光LED每辐射1W的光功率所需的电功率为1.51W，上述白光LED发光光谱对应的白光LED的电－光转换的理论极限流明效率为197.8lm/W。

Since the side chains on the polymers bear nitrogen atoms with an unshared electron pair, the polymers become protonated in acidic solution to generate polycationic species.

由于侧链对聚合物承担氮原子与一取消共用电子对，聚合物成为质子在酸性溶液中产生polycationic物种。

There are lots of heterocyclic compounds with lone electron pair such as orgnic sulfurs and nitrogen in environment specially in fossil fuels, part of which are quite toxic and may cause cancer, haemophilia and respiratory diseases.

地球环境特别是化石燃料中存在着大量含硫，氮和氧孤对电子杂环化合物。

It utilizes the knowledge of nuclear physics, photo-electricity, polymer physics, computer technology and mathematics synthetically, the polymer morphology in solid conveying can be visually obtained by the interaction of polymer atom or polymer chain and the photon beam caused by γ-ray, in which the photoemission, Compton effect and electron pair effect will be generated.

该方法综合运用核物理学、光电子学、高分子物理、计算机技术和数学知识，通过γ-射线的光子流与聚合物原子、聚合物链段相互作用所产生的光电效应、康普顿效应和电子对效应，来图像化地测量固体输送段的聚合物形态。

With Death guitarist Schuldiner adopting vocal duties, the band made a major impact on the scene.

随着死亡的吉他手Schuldiner接受主唱的职务，乐队在现实中树立了重要的影响。

But he could still end up breakfasting on Swiss-government issue muesli because all six are accused of nicking around 45 million pounds they should have paid to FIFA.

不过他最后仍有可能沦为瑞士政府&议事餐桌&上的一道早餐，因为这所有六个人都被指控把本应支付给国际足联的大约4500万英镑骗了个精光。