色谱交点在多相催化研究中的应用——Ⅰ.芳烃在分子筛催化剂上的交点

测定了苯、甲苯、乙苯、二乙苯在四种分子筛催化剂上的保留体积.这些催化剂都被用于研究从苯和乙醇合成乙苯的反应中.发现了苯、甲苯、乙苯的 logV_g-1/T 直线都有共同交点.证明了气相色谱中同系物交点的一般原则,可以用在催化反应的研究中,从而为该反应提供一些有用的信息.     

丁腈橡胶标准物质的~1H-NMR表征

应用1H -NMR技术对系列丁腈橡胶 (BNR)标准物质的结构进行了表征。测定了丁腈橡胶标准物质中聚丁二烯链段中的顺式和反式结构含量、聚丁二烯链段中 1,4加成聚合与 1,2加成聚合的含量以及丁腈橡胶标准物质中结合丙烯腈的含量     

色谱交点在失活催化剂研究中的应用 Ⅰ.苯-催化裂化衰化系列催化剂体系

测定了苯在五种积炭量不同的催化裂化衰化系列催化剂上的保留体积,发现它们的logV_g对1/T直线有一共同交点。这是吸附色谱中同一吸附剂上吸附质为同系物时存在色谱交点的延伸。这是将色谱交点规律应用于失活催化剂研究的新探索。     

A Density Functional Theory Study on Electronic Structure and Second—order Nonlinear Optical Properties of Some Push—Pull Molecules

Time-dependent density-functional theory(TDDFT)has been applied to calculate the electronic structure and second-order nonlinear optical(NLO) properties of some organic molecules.The two-dimensional(2-D)charge transfer charateristics of calculated molecules were studied and compared with corresponding experimental results.All the theoretical results agree well with the measurement.For 2-D molecule with two-fold symmetry,the dominant charge transfer is off-diagonal,while for three-fold symmetry 2-D molecule,the dominant charge transfer is not only between branches and central group but also among branches.     

乙烯在纳米催化剂InVO4-TiO2上的可见光降解

The InVO₄-TiO₂ nano-crystalline photocatalyst was prepared by sol-gel method and characterized by DRS, FTIR, Raman and XRD. The photocatalytic activities of the prepared sample were investigated by photocatalytic degradation of ethylene in the gaseous phase under visible light irradiation (λ>450 nm). The results indicate that both of pure TiO₂ and InVO₄ or their simple mixture show no photocatalytic activities for degradation of ethylene under visible light irradiation. However, as-synthesized InVO₄-TiO₂ catalyzes the degradation of ethylene into CO₂ under visible light irradiation. In addition, the interaction between InVO₄ and TiO₂ results in some structural distortion to all the crystal forms of TiO₂ in as-synthesized catalyst InVO₄-TiO₂.     

一种用于版权保护的随机相位量化编码方法

基于传统的随机相位编码技术，提出了一种新的相息图量化编码方法。该方法采用条码编码技术和数制转换原理，将编码得到相息图的高阶量化信息映射为二值矩阵，并进一步打印制作成二值的防伪标签，不但可以实现文本内容的自动录入，同时也提高了传统随机相位编码技术解码图像的信噪比。计算机仿真与光学扫描实验表明，该方法具有认证过程相对简单、解码图像信噪比高、成本低和防伪性能好等优点。     

Synthesis,Single-crystal Structure,and Computational Studies of a Yavapaiite Structure Compound:Pb(Sb_(0.5)Fe_(0.5))(PO_4)_2

The single crystals and powder of a Yavapaiite Structure phosphate,namely,PbSb_(0.5)Fe_(0.5)(PO_4)_2,were synthesized by solid state method and characterized by X-ray single-crystal diffraction and powder diffraction.The title compound crystallizes in the monoclinic system,space group C2/c(No.15) with a = 16.716(4),b = 5.186(7),c = 8.130(2) ?,β = 114.93(6)o,Z = 4,R(I 2s(I)) = 0.0430,R indices(all data) = 0.0460,and T = 293(2) K.The title compound belongs to the Yavapaiite Structure A(Ⅱ)M(Ⅳ)(PO_4)_2 compounds,and the Sb1 atom and Fe1 atoms occupy the same site(M) and their occupancy factors are refined to be 0.5 and 0.5 having a sum occupancy factor of 1.0.Its structure consists of [M(PO)_4]_2 nn layers running parallel to the(b,c) plane built up of cornerconnected MO_6 octahedra and PO_4 tetrahedra.Additionally,the calculations of energy band structure,and density of states have been performed with the density functional theory method.The studies of computational calculation and UV experimental results show that the new compound is an indirect band-gap insulator.     

两种测定果汁中钾磷含量方法的比较与分析

采用微波消解-等离子体发射光谱法同时测定果汁中K、P含量,优化了实验所需的各种条件。与国家标准方法湿法消解-分光光度法的测定结果作了实验比较,结果表明本实验方法更简单、高效,节省了样品的前处理时间,减小了最终结果的误差。该法灵敏度高、线性范围宽、加标回收率高,结果令人满意。     

DAB网页推送业务BWS的实现

DAB BWS(Digital Audio Broadcasting Broadcast Web Site),是数字广播一种数据业务。用户通过数字广播接收终端便能浏览网页,可查询新闻、天气预报等最新信息。介绍基于PC机的DAB推送业务BWS[2]的软件实现。在一定程度上促进了互联网与广播的融合。     

KBA显微镜成像系统的成像模拟及X光成像实验的研究

KBA显微镜是一种非轴对称、非共轴的掠入射成像系统。其结构复杂,调节精度要求很高,在实际成像实验操作中难以掌握其成像特性。利用光学设计软件模拟其成像,对系统的调节和成像分析提供有益的参考。利用光学设计软件ZEMAX模拟了KBA显微镜对点源的成像过程,给出了KBA显微镜成像系统的焦深约为1 mm,景深为50 mm左右。并且由模拟可知,掠入射角对成像的影响很大。对像素尺寸约10μm的探测设备,模拟得出KBA成像系统的空间分辨力上限为3μm左右。基于星光Ⅱ装置对周期为20μm的网格靶成像,获得了KBA显微镜较为清晰的X光图像。该项工作为进一步开展掠入射成像系统的研究奠定了基础。