查询词典 valence

And the Randic-Kier index,χ, is defined as,χ=∑C, whereC, and δ is the calculated valence delta for the carbon atom or heteroatom.

上标 mχ定义为χ∑C，子图项，δ为碳原子或杂原子价点价。

Valence characterized by the transfer of electrons from atoms of one element to atoms of another during the formation of an ionic bond between the atoms.

电价在原子间形成离子键的过程中，由电子从一种元素的原子转移到另一种元素的原子所表示的价

A plausible charge distribution of Fe and Mo valence states is proposed, and the stability of the compounds is discussed. Polycrystalline samples of 〓(0.8≤x≤1. 5) are prepared by solid-state reaction at high temperature. The alteration of the relative content between Fe and Mo in 〓 exhibits a significant effect on the crystal structure and the ionic ordering of the compounds.

采用传统高温固相烧结反应法合成了非化学配比的双钙钛矿型〓系列化合物。X射线粉末衍射数据分析结果表明，非化学配比的双钙钛矿结构〓（0.8≤x≤1.5）系列化合物的晶体结构随着Fe含量x的变化在x=1.2附近有一个由四方14/mmm对称向立方Fm〓m对称的结构结构相变发生。

Studies on the characterization of molecular sieves showed that Co and Mn incorporated into the framework by isomorphous substitution of Al and both of them had the same valence (+2) in the as-synthesized and calcined samples.

它们在分子筛焙烧去除模板剂过程中价态不发生变化，均为+2价。

The n-type gate modulation could be explained by the bending effect of valence band in the Schottky-barrier junction. The photoconductive diode and optical switch behavior was demonstrated for the first time from a C/CNX multi-walled nanotube junction with a Schottky barrier. Theconductivity of nanotube can be reversibly changed by 3 to 4 orders of magnitude when the 5 mW cm2 white lights was turned on and off.

器件原理是栅极静电场调节碳纳米管和CNx纳米管间的Schottky势垒的高度和宽度，从而影响载流子的传输。8首次利用单根CN万／C纳米管作为半导体材料制备了Schottky光导二极管和光开关。

The x-ray photoelectron spectroscopy of La-Pr-Mn-O reveals that the valence state of Pr include Pr〓, which indicates that the La-Pr-Mn-0 manganite is another new electron-doped CMR compound.

XPS谱研究表明：La-Pr-Mn-O中有pr〓存在，而且这种材料几乎在整个掺杂范围都是单相。

Some molybdenum compounds (in which it has various valence s) are used as pigments and catalysts.

有些钼的化合物(钼在化合物中可以有不同的原子价)可以做颜料和催化剂。

Halogen atoms contain seven electrons in their valence shell, and, consequently, are monovalent

卤原子在它们的价电子层含有七个电子，因此是一价的。

objective compare the ill effect and valence of analgesia of morphia with the same dosages and 1.5 times dosages of tramadol after the thoracotomy.

目的 比较与吗啡等效剂量及1.5倍等效剂量的曲马多，用于开胸术后pcia的镇痛效价与副作用。

The blue and purplish blue color derives from octahedral cordination formed with di -valence cobalt and ferric ion.

蓝色的至色机理是二价的钴离子和二价的铁离子构成的配位八面体对光的选择性吸收。

Hanna: That's over now, isn't it?

都结束了，对吗

You must be ill. You look so pale.

你一定是病了，你的脸色苍白。