光信息综合实验中光源的选择和性能改善

在光信息综合实验中,在分析氦氖激光器的优缺点的基础上,阐述了半导体激光器的显著优点以及存在的一些局限性。利用实验室现有的器件,引导学生对半导体激光器进行了光束准直和整形以提高激光器的性能,并用已优化的半导体激光器作为光源进行了全息光栅和全息透镜的制备以及电光调制和液晶光阀等实验。结果表明,性能改善的半导体激光器完全可以取代氦氖激光器,可满足光信息综合实验的要求。在整个设计制作过程中,培养了学生分析问题和解决问题的能力。     

病毒传播的动态分析

结合最新病毒传播的研究工作,建立了一系列微观病毒传播系统,并对动态系统作了简单的分析,是对宏观疾病传播的内在规律的描述和研究,有利于疾病发展趋势的预测和最优化控制策略的研究.     

Biosensors with reversed micelle-enzyme sensitive membrane

The effect of reversed micelle on the conformation of enzyme was studied by sensor techniques. By means of measurement of the response current of GOD enzyme membrane electrode, the effects of enzyme embedded in AOT reversed micellar on GOD conformation and catalytic activity are discussed. The results show that the response current increased greatly with decreasing ratio of GOD/AOT, meaning that the catalytic activity and the conformation stability of enzyme were enhanced.     

加权Bergman空间A2α(Ω)上的Schatten-P类加权复合算子

刻画加权Bergman空间A2α(Ω)上的加权复合算子Cψ,ψ的Schatten-p类.     

用Zn/F离子先后注入和热退火法实现ZnO量子点的可控生长

将Zn/F离子先后注入到非晶二氧化硅中并分别在400,600,700 ℃下进行了退火.用光学吸收谱、透射电子显微镜(TEM)、高分辨透射电子显微镜(HRTEM)对退火的样品进行分析,发现在600 ℃退火后ZnO量子点已经形成.二次离子质谱仪(SIMS)测试发现在溅射时间为2 s时Si,Zn元素同时出现,说明没有在衬底的表面形成ZnO薄膜.从原子力显微镜(AFM)图像看到有少量的颗粒被蒸发到衬底的表面,说明在衬底的内部形成了ZnO量子点.F离子注入的作用为在衬底的内部形成ZnO量子点提供了O2分子.     

Proton Transfer Isomerization of Pyrazole in the Ground State:σν sπ Mechanism and Water Assisting Effect

The proton transfer isomerization of pyrazole and the water assisting effect by looping 1 to 4 water molecules on the singlet state potential energy surface have been investigated by using hybrid density functional theory method (B3PW91) with a 6-311++G** basis set. Two mechanisms were proposed to explain the mono- and multi-water assisting effects, respectively. The reactants and products of all groups have been characterized on their potential energy surfaces. For the isomerization of monomolecule pyrazole, the isomerization energy barrier is 46.4 kcal·mol-1. For the monohydration assisting mechanism, the reactant complex is connected to the product complex via two saddle points. The corresponding isomerization barriers are 46.7and 23.0 kcal(mol-1, respectively. As to the multihydration assisting mechanism, the isomerization barriers are 12.0, 10.9 and 13.14 kcal(mol-1 accordingly, when the number of water molecules is 2, 3 and 4, respectively. The multihydration assisting isomerization can occur in water-dominated environments, for example, in the organism, and thereby is crucial to energy transference. The deproton and dehydrogen energies of monomolecule pyrazole and various hydrated pyrazoles were calculated and then found much bigger than the isomerization barriers of their relative complexes, suggesting the impossibility of deprotonation or dehydrogenation. The isomerization of pyrazole is a proton-coupling-electron-migration process, but two different mechanisms are noticed, viz.σ- and π-type mechanisms. The π-bond of pyrazole participates in isomerization in the π-type mechanism, whereas only σelectron takes part in isomerization in the σ-type mechanism.     

Blue electroluminescence from 3,6‐silafluorene‐based copolymers

Poly(3,6‐silafluorene) is a typical wide band‐gap conjugated polymer with ultraviolet light emission. The blue electroluminescence from the 3,6‐silafluorene‐based copolymers via intrachain energy transfer was reported in this study. The monomer containing vinylene, anthracene, and tri‐arylamine moieties incorporated into the poly(3,6‐silafluorene) backbone can form efficient deep‐blue emitting copolymers with EL efficiency of 1.1–1.9%. © 2009 Wiley Periodicals, Inc. J Polym Sci Part A: Polym Chem 47: 3286–3295, 2009     

我国人口时间序列的变系数预测模型

根据1952-2005年我国人口总量和GDP总量数据,建立变系数模型.采用逐步回归的方法来选择显著滞后变量子集,推导出系数函数的样条估计表达式,最后运用Bootstrap思想,进行点预测和区间预测。运算结果表明:对于该组数据,变系数模型能较理想地描述数据之间的内在结构,且具有较少的预测误差.     

三维Minkowski空间中非类光曲线的双曲达布像和从切高斯曲面

本文主要给出了三维Minkowski空间中非类光曲线的双曲达布像和从切高斯曲面的奇点分类,并且建立了奇点和曲线几何不变量之间的联系,其中曲线几何不变量与曲线同螺线切触的阶数密切相关.     

Synthesis, Crystal Structure and Luminescent Property of a Novel Pt(II) Complex with Weak Metal-metal Interaction

The title complex cis-bis(tetrahydrothiophene)-bis(nitrate) platinum(II), (tht)2Pt(NO3)2, was the reducing product from potassium hexachloroplatinate(IV) K2PtCl6 where the platinum is tetra-valenced. Crystal data for C8H16N2O6PtS2: monoclinic, space group P21/c, a = 9.8833(5), b = 8.6744(4), c = 18.6407(9) (A), β = 114.401(3)°, V = 1455.35(12) (A)3, Z = 4, Mr = 495.44, Dc = 2.261 g/cm3, F(000) = 944, μ = 9.950 mm-1, λ(MoKα) = 0.71073 (A), T = 293(2) K, 2θmax = 54.96o, GOOF = 1.033, R = 0.0350 and wR = 0.0785 for 2572 observed reflections with I > 2σ(I). X-ray diffraction studies reveal that the title complex has interesting weak metal-metal interactions and two molecules linked by metal-metal interaction exist as a group. Luminescent spectrum illuminates red emission of the complex at room temperature.