N,N-二乙基丙烯酰胺与丙烯酸在聚丙烯薄膜表面光接枝制二元接枝膜及其温度、pH值敏感特性研究

以二苯甲酮为引发剂,聚丙烯薄膜(CPP)为基材,通过紫外光接枝的方法制备了具有温度和pH值双重敏感特性的聚N,N-二乙基丙烯酰胺(PNDEA)与聚丙烯酸(PAA)二元接枝膜.在PNDEA一次接枝膜的制备过程中,引发剂与单体配比相同时,本体接枝方法的接枝速率在反应初期明显高于溶液接枝方法;采用溶液法时,增大引发剂与单体配比等可提高接枝率.用本体法所制得的PNDEA一次膜光活化接枝PAA时接枝速率较溶液法高,并且能够实现较高的PAA接枝率.用红外光谱(FTIR)、X射线光电子能谱化学分析(ESCA)对接枝层组成的表征结果证实了二元接枝层的存在.在不同温度下,PNDEA一次接枝膜的FTIR谱图中酰胺Ⅰ带特征吸收峰发生位移表明它具有温度敏感特性.用扫描电子显微镜(SEM)对PNDEA接枝层表征结果表明,用不同接枝手段所制备的接枝膜具有不同的表面形貌.通过吸水率测定研究了二元接枝膜的温度及pH值敏感特性.     

同时测定牙膏中的单氟磷酸盐与游离氟的研究

采用离子色谱法同时测定了牙膏中游离氟与单氟磷酸盐的含量。结果表明,该法具有简单、准确、快速等特点,可以在牙膏产品检测中推广使用。     

铷原子频标数字伺服系统

分析了铷频标内锁频环路相敏检波基本原理和数字伺服的基本方法. 采用单片机(MCU)、模数转换器(ADC)和数模转换器(DAC)设计了一种数字伺服系统. 利用该数字伺服系统,实现了铷原子频标的闭环锁定,短期稳定度指标达到一般商品铷钟水平.     

Free vibration of circular cylindrical shell with constrained layer damping

Free vibration characteristics of circular cylindrical shell with passive constrained layer damping (PCLD) are presented. Wave propagation approach rather than finite element method, transfer matrix method, and Rayleigh-Ritz method is used to solve the problem of vibration of PCLD circular cylindrical shell under a simply supported boundary condition at two ends. The governing equations of motion for the orthotropic cylindrical shell with PCLD are derived on the base of Sanders’ thin shell theory. Numerical results show that the present method is more effective in comparison with other methods. The effects of the thickness of viscoelastic core and constrained layer, the elastic modulus ratio of orthotropic constrained layer, the complex shear modulus of viscoelastic core on frequency parameter, and the loss factor are discussed.     

四磺酸基酞菁锌在水和非水溶液中的电化学性质研究

在非水溶剂（二甲基亚砜（ＤＭＳＯ）及Ｎ,Ｎ－二甲基甲酰胺（ＤＭＦ））中的伏安曲线。呈现三对电流峰,表明存在三个可逆或准可逆酞菁配体的单电子转移过程,而在水溶液中则不呈现准可逆行为,且波形改变很大。此外,还比较了四磺酸基酞菁锌的水溶液在自然光和红光（６００￣７００ｎｍ）照射下的循环伏安曲线,其氧化还原峰的数目和峰电位基本不变,但在红光照射下比自然光照射下的峰电流明显增大。     

Optical Parameters and Absorption of Azo Dye and Its Metal-Substituted Compound Thin Films

We determine the complex refractive indices N(N= n-ik), dielectric constants ε(ε=ε1 - iε2), and absorption coefficients a of a new azo dye [2-(6-methyl-2-benzothlazolyazo)-5-diethylaminophenol(MBADP)]-doped polymer and its nickel- and zinc-substituted compounds(Ni-MBADP and Zn-MBADP) spin-coated thin films from a scan-ning ellipsometer in the wavelength 400-700 nm region. Metal chelation strongly (about one times) enhances the optical and dielectric parameters at the peaks and results in a large bathochromic shift (50-60nm) of absorption band. Bathochromic shift of Ni-MBADP is about 1Ohm larger than that of Zn-MBADP due to different spatialconfigurations formed in the metal-azo complexes.     

GeSbTe与AglnSbTe体系相变光盘的研究进展

自Ovshinsky把相变材料用于光存储以来，一大批具有可逆光存储性能的材料不断出现，其中研究较多的是GeSbTe和AgInSbTe两种体系．文章着重介绍了利用这两种材料制成的相变光盘记录介质的微观结构特点，阐述了其晶化机理；同时，较详细地概述了光盘的堆栈结构及掺杂其他元素对相变光盘性能的影响，并对比说明了GeSbTe和AgInSbTe两种体系在蓝光记录方面的各自特点．     

q超几何级数2Φ0[a,b;z]两个基本恒等式及其一些应用

本文由有限域上交错矩阵方程Ｘ Ｋ２ｖＸ’＝０的解数公式得到ｑ超几何级数２Φ０的一个基本恒等式，并且用它能直接把一些特殊矩阵的这类方程的解数由函数２Φ０表出。另外还用２Φ０的一个恒等式得出Ｆｑ上ｍ阶特殊矩阵的个数。     

室温下弹道金属点接触电导量子化的STM研究

电子工业的发展促进着介观物理的发展，曾经被Ｓｈａｒｖｉｎ用半经典理论研究过的长度小于电子平均自由程、宽度在费米波长范围的量子点接触中的弹道传输正逐渐成为介观物理研究的一个热点．所谓点接触就是两个电极间的很小尺度的接触．当点接触的长度小于材料中的电子平均自由程时，两端电子库中的电子穿过点接触时不发生散射，输运便是弹道的．由于在点接触中电流传输态受到横向限制，从而使这些态的横向动量产生量子化，导致点接触两端电导值随点接触的宽度变化而呈阶跃上升，即量子化．虽然二维电子气中量子点接触电导量子化已经被实验…     

Preparation,Crystal Structure and Density Functional Theory Calculations of the Ion-pair Compound [Cl2Bz（3-MeQl）]（TCNQ）

A novel compound [Cl2Bz(3-MeQl) ](TCNQ) ([Cl2Bz(3-MeQl) ]+ = 1-(3,4-dichlo-robenzyl) 3-methlquinoline cation,TCNQ-= 7,7,8,8-tetracyanoquinodimethanide anion) has been synthesized by the reaction of [Cl2Bz(3-MeQl) ]Br and LiTCNQ,and its structure was determined by single-crystal X-ray diffraction. The crystal belongs to monoclinic,space group P21/c. The structure analysis shows that the anions are stacked into a column with isolated π-dimers,and there is one type of TCNQ entries(TCNQ) ,in agreement with the IR spectra analysis and density functional theory calculations of the compound. The most prominent structural features are the completely segregated stacking columns of the TCNQ- anions and [Cl2Bz(3-MeQl)]+ cations.