类锂碳离子能级,波函数和跃迁几率

用组态相互作用程序ＣＩＶ３计算了类锂碳离子能级、波函数和跃迁几率，并与相对论多组态ＤｉｒａｃＦｏｃｋ程序ＭＣＤＦ的计算结果进行了比较。两种方法的结果符合得很好。     

5－Br－PADAP测定地下水中钒

本文研究了ＨＣｌ－ＫＣｌ缓冲体系中钒（Ⅴ）与５－Ｂｒ－ＰＡＤＡＰ形成配合物的条件及配合物的带电性质。提出一个灵敏、简便、快速测定钒的分光光度法。配合物的表观摩尔吸光系数为３．８×１０~４，最大吸收波长为５８８ｎｍ，钒（Ⅴ）与５－Ｂｒ－ＰＡＤＡＰ的配合比为１：１。含钒量在０—２０μｇ／２５ｍＬ范围内符合比尔定律。分析了地下水中钒，结果满意。     

Linear and nonlinear optical properties of strained GaN/AlN quantum dots: Effects of impurities,radii of QDs,and the incident optical intensity

The linear and nonlinear optical properties of cylinder GaN/AlN quantum dots with strain effects and impurity are investigated by taking into account the effects of the deformation potential and piezoelectric potential on the conduction band edge. The results are presented as a function of photon energies and QD radii. The optical absorption spectrum and refractive index changes have a blueshift in the presence of the impurity. With increasing distance of the impurity’s position along the growth direction, the peak values of the refractive index changes decrease and shift to higher photon energy. When the sizes of the QDs increase, redshift effects are observed and the relative amplitudes diminish. It can be found that the nonlinear effect becomes obvious with increase of the incident optical intensity. Then there is a “hole-burning” in the absorption coefficient spectra and two new peaks will appear in the total refractive index change spectrum when the optical intensity becomes larger enough. Finally it can be concluded that the intensity of the incident light and the position of the impurity play an important role in the linear and nonlinear optical properties.     

News Video Summarization Combining SURF and Color Histogram Features

Because the data volume of news videos is increasing exponentially, a way to quickly browse a sketch of the video is important in various applications, such as news media, archives and publicity. This paper proposes a news video summarization method based on SURF features and an improved clustering algorithm, to overcome the defects in existing algorithms that fail to account for changes in shot complexity. Firstly, we extracted SURF features from the video sequences and matched the features between adjacent frames, and then detected the abrupt and gradual boundaries of the shot by calculating similarity scores between adjacent frames with the help of double thresholds. Secondly, we used an improved clustering algorithm to cluster the color histogram of the video frames within the shot, which merged the smaller clusters and then selected the frame closest to the cluster center as the key frame. The experimental results on both the public and self-built datasets show the superiority of our method over the alternatives in terms of accuracy and speed. Additionally, the extracted key frames demonstrate low redundancy and can credibly represent a sketch of news videos.     

冠醚萃取苦叶酸钪与配合物的晶体结构研究

研究了苯并１５冠５（Ｂ１５Ｃ５）和二苯并１８冠６（ＤＢ１８Ｃ６）萃取苦味酸钪的萃取平衡。在ｐＨ２～３，用斜率法确定了两种萃合物的组成，并由此计算了它们的表观萃取平衡常数。通过苯并１５冠５苦味酸钪配合物的合成、表征及晶体的结构测定，讨论了萃取机理。     

μ-σ,π-苯乙烯基铁硫配合物亲核取代反应的研究——某些三苯膦或三苯胂μ-σ,π-苯乙烯基铁硫配合物的合成及结构

(μ-σ,π-PhCH=CH)(μ-RS)Fe_2(CO)_6和PPh_3或AsPh_3在苯中回流可分别制得(μ-σ,π-PhCH=CH)(μ-RS)Fe_2(CO)_5和PPh_3(R=Et,Bu~t,CH_2=CHCH_2)和(μ-σ,π-PhCH=CH)(μ-RS)Fe_2(CO)_5AsPh_3(R=Et,Bu~t).经X-射线衍射法测得(μ-σ,π-PhCH=CH)(μ-Bu~tS)Fe_2(CO)_5AsPh_3的单晶结构.该晶体属三斜晶系.空间群P1.晶胞参数:a=10.196(2),b=11.62(2),c=15.814(3)(?);α=102.41(1),β=91.38(2),γ=112.93(1)°;V=1673.1(?)~3,D_c=1.49g·cm~(-3),Z=2.     

μ-σ,π-苯乙烯基铁硫配合物亲核取代反应的研究——某些三苯膦或三苯胂μ-σ,π-苯乙烯基铁硫配合物的合成及结构

(μ-σ,π-PhCH=CH)(μ-RS)Fe₂(CO)₆和PPh₃或AsPh₃在苯中回流可分别制得(μ-σ,π-PhCH=CH)(μ-RS)Fe₂(CO)₅PPh₃(R=Et,Bu^t,CH₂=CHCH₂)和(μ-σ,π-PhCH=CH)(μ-RS)Fe₂(CO)₅AsPh₃(R=Et,Bu^t).经X-射线衍射法测得(μ-σ,π-PhCH=CH)(μ-Bu^tS)Fe₂(CO)₅AsPh₃的单晶结构.该晶体属三斜晶系.空间群P1.晶胞参数:a=10.196(2),b=11.62(2),c=15.814(3)Å;α=102.41(1),β=91.38(2),γ=112.93(1)°;V=1673.1ų,D_c=1.49g·cm^-3,Z=2.     

Curing theory of A f -A g type free radical polymerization (I)

By means of polymer statistical theory, the sol fraction and the gelation condition of A _f -A _g type nonlinear free radical polymerization are obtained by introducing the probabilities with respect to initiation and chain addition. With Lagrange expansion theorem, the equilibrium number fraction distribution of A _f -A_g type is obtained, and its invariant property is proved. Moreover, the evaluation of average polymer quantities for post-gel regime is simplified by this invariant property. Project supported by the National Natural Science Foundation of China (Grant No. 29673018), and the Ph.D.-funds of the State Education Commission of China.