查询词典 covalency

The lower energy is because that the chemical bond between O〓 and M〓 has not formed completely, which cause by the higher covalency of Eu〓-O〓 bond in amorphous state. And the larger half width is caused by the disorder of sites.

这是由于在非晶态状态下金属氧键尚未完全形成，从而导致Eu〓-O〓的共价性较高，因此电荷迁移带处于较低的能量位置；而格位的无序性导致其光谱变宽。

The quantitative relationship between isomer shift, refractive index and chemical bond parameters were established. The calculated results indicated that the change of crystal parameters and bond length will alter the covalency of chemical bond and peripheral electron density of Fe2+ nuclear, which in turn leads to the change of the isomer shift and refractive index.

根据计算结果发现，晶胞参数及化学键长的变化引起化学键共价性、Fe2+核附近电子云密度的变化等，最终导致同质异能位移的改变，计算结果与实验数据之间较好的一致性验证了此理论的准确性和普适性。

Mossbauer isomer shifts of Fe2+ ion in LaFeAl11O19 and Eu3+ ion in LaMgAl11O19 are calculated by using the chemical surrounding facter,h,definited by covalency and electronic polarizability,and the results are in agreement with the experimental values.

利用由共价性和极化率定义的化学环境因子h计算了LaFeAl11O19中57Fe的穆斯堡尔同质异能位移和LaMgAl11O19∶Eu中151Eu的同质异能位移，所得结果与实验值一致。

This paper compared the Covalency - Effect and the Nephelauxetic - Effect, applied these two methods in the absorption spectra of DMS Zn1- xMnxTe, and found that both methods can gain fine results. But the results by applying the Nephelauxetic - Effect modifying factor to modify the radial wave functions are much closer to the experimental values.

该文对共价效应和电子云延伸效应在处理稀磁半导体的吸收光谱方面的应用做了详细的比较，并分别应用到了稀磁半导体Zn-xMnxTe上，虽然两种处理方法都能够得出比较好的结果，但用电子云延伸效应修正因子修正波函数得出的结果与实验更为接近。

In addition,the spectra and the g factor of GaP∶Co2+ crystal also are analyzed,the results show that,for the strongly covalent of GaP∶Co2+ crystal,it is not reasonable to neglect the covalency and the contribution due to the s.o.coupling of the ligand ion.

本文结果表明，由于GaP∶Co2+晶体共价性很强，再忽略共价性及配体旋轨耦合的贡献是不合理的。

X=0, 11, 22, 33, 44, and 55 borophosphate glasses series have investigated, and it is found that:(1) both the covalency bonding between Yb〓 ion and oxygen ion and the asymmetry in local structures surrounding Yb〓 ion have strong effects on integrated absorption cross section ∑〓 and emission cross section σ〓 of Yb〓 ion in borophosphate glasses;(2) the borophosphate glasses and borate glasses appear superior as Yb-gain media to the phosphate glasses, although the phosphate glasses have been demonstrated as the most appropriate Ndgain media.

在第二章中，我们对〓（x=0，11，22，33，44，和55）系列的掺Yb〓硼磷酸盐玻璃的吸收光谱和发射光谱特性进行了研究，结果表明：（1）在硼磷酸盐玻璃中，Yb-O键的共价键成分和Yb〓离子周围的近邻结构的对称性两个因素对积分吸收截面∑〓和受激发射截面σ〓的影响都很大；（2）尽管磷酸盐玻璃是最合适的掺钕激光增益基质，但是作为掺镱的激光增益基质，硼磷酸盐玻璃和硼酸盐玻璃都要优于磷酸盐玻璃。

The nephelauxetic parameter, bonding parameter and covalency parameter are calculated according to the location of the PA peaks in NdF〓, Nd〓.H〓O and Nd〓〓.

根据NdF〓、Nd〓。H〓O和Nd〓〓的谱峰位置，计算了它们的电子云重排参数β、键合参数b〓和Sinha共价参数δ。

The fluorescence spectra of Eu~(3+) may be used to study the structure ofcompounds.The band shift of Nd~(3+) in its absorption spectra,the red-to-orangeintensity ratio of the Eu~(3+) emission(~5D_0→~7F_2)/(~5D_0→~7F_1)and the yellow-to-blue intensity ratio of the Dy~(3+) emission~4F_(9/2→~6H_(13/2)/~4F(9/2→~6H(15/2)intheir fluorescence spectra may be used to study the degree of covalency of theLn-O bond and its relation with the electronegativity of M in Ln-O-M.

本文介绍了利用 Eu~(3+)的荧光光谱研究化合物的结构；利用 Nd~(3+)的吸收光谱的谱带位移和 Eu~(3+)的荧光光谱的红橙发射强度比(~5D_0→~7F_2)/(~5D_0→~7F_1)和 Dy~(3+)的黄兰比~4F_(9/2→~6H_(13/2)/~4F_(9/2→~6H_(15/2)，了解Ln—O—M中 Ln—O 化学键的共价程度以及 M 的电负性对共价程度的关系；利用吸收光谱、荧光光谱和磁化率研究稀土的价态以及利用磁化率研究化合物的组成。

Objective To investigate the effects of interleukin-1 β converting enzyme gene on the biologic characteristics of ovarian cancer cells.

目的 探讨白细胞介素-1 β转换酶的表达，对卵巢癌细胞生物学特性的影响。

Campylobacter: This illness is the most commonly identified cause of diarrheal illness in the world.

弯曲：这种病是最常见的原因查明腹泻病，在世界上。