极化率

The influence of position of the substitution, strength and number of donors and acceptors, and their coplanarity and asymmetry is discussed. The results indicate that the molecules may have larger first hyperpolarizabilities when the molecules have stronger and more donors and acceptors, large asymmetry of HOMO and LUMO, better coplanarity and higher accentricity. This work attemps at finding out the relationship between the structure and the property, thus providing theoretical basis for designing nonlinear optical molecules.

进一步研究体系中取代基的位置，给体与受体的数量和得失电子的能力，分子的共面性和对称性对分子第一超极化率的影响，结果表明，有机分子拥有更多数量与更强得失电子能力的给体和受体，最高占据分子轨道和最低未占据分子轨道空间分布的不对称，具有较高的原子共面性和较低的分子中心对称性，都能显著增加

In this part, we focus on the third method: utilizing density matrix to obtain the formula of the third-order susceptibility.

其中，我们着重讨论了利用密度矩阵方法推得的三阶非线性极化率的计算公式。

Some valuable results are obtained in this dissertation, the most important are as follows:(1) The uncertainty in the determination of 〓Cs dc hyperfine polarizability constant κ is taken into account in the correction of blackbody ac Stark shift and it will bring out a fractional frequency uncertainty of about 4×10〓 to the correction.

本文还得到一些具有创新意义的研究结果，最主要的有：（1）我们首次考虑了直流极化率常数κ的测量误差对黑体辐射斯塔克频移修正误差的影响，经计算发现，由κ的测量误差导致的频移误差约为4×10〓，是黑体辐射斯塔克频移的主要误差来源。

The main work was centered on the study of microscopical morphology of incorporated nanostructured metal.

高的金属含量，均匀的粒子分布和非共振局域增强导致了极化率的提高。

However, up to now, the MR effect of MTJ with Fe3O4 as an electrode has been found to be negligibly small.

可能是带有自旋的电子在穿隧过程当中在接面处发生了自旋翻转，以及MTJ系统中间的氧化绝缘层和Fe3O4之间在接面处的作用，降低了Fe3O4本身的自旋极化率。

In chapter 4, we study the polarizability of niobium clusters including d electron.

第四章，我们研究了包含d电子的铌团簇的极化率。

The average molecular polarizability is the main molecular structural factor.

平均分子极化率是影响化合物光致毒性的主要分子结构因素。

This method was very convenient to the systematical study of the molecular orbital properties and its polarizability, which was a prerequisite for the understanding of the origin of STM contrast.

这种方法为系统研究STM图像反差与分子极化率及电子态密度的关系提供了很大的便利。

The result indicates that the transition disorder between different ordered band states will result in the decreasing of electronic spin polarizability and disappearing of half-metal character of materials.

不同的原子有序态间的转变无序将导致电子自旋极化率的降低或材料半金属性的消失。

Under the influence of an external electric field defined by Sparkles, wecomparatively study the molecular structures and NLO responses of the push-pull thiophene quinoid molecules, push-pull furan quinoid molecules and push-pull pyrrole quinoid molecules. The results make known that the relative size ofthe molecular polarizability values for the three quinoid-type molecules dependson the selection of the donor-acceptor pairs.

比较研究了推-拉噻吩醌型分子、推-拉呋喃醌型分子以及推-拉吡咯醌型分子在点电荷外加电场作用下的分子结构和NLO响应，结果表明：这三种分子超极化率的相对大小取决于给体-受体对的选择。

Singer Leona Lewis and former Led Zeppelin guitarist Jimmy Page emerged as the bus transformed into a grass-covered carnival float, and the pair combined for a rendition of "Whole Lotta Love".

歌手leona刘易斯和前率领的飞艇的吉他手吉米页出现巴士转化为基层所涵盖的嘉年华花车，和一双合并为一移交&整个lotta爱&。

This is Kate, and that's Erin.

这是凯特，那个是爱朗。