高碘酸钠氧化法测定肌醇含量

高碘酸钠氧化法测定肌醇含量张楚富，林清华，梁会（武汉大学生命科学学院武汉４３００７２）王泽胜（湖南兰龙科技实业公司长沙４１０００６）关键词植酸钙，肌醇，高碘酸钠氧化法分类号Ｑ５０８肌醇是一种环己六醇，它以植酸盐的形式主要存在于米糠和其他油料作物种子中...     

新型多联吡啶的合成

设计并合成了一种新型配体１，２－二（６”－（６－甲基－４’－苯基－２，２’：６’，２”－三联吡啶基）乙烷，它是由１－（６’－甲基－２’－吡啶基）－３－苯基－２－丙烯－１－酮３与１－（６’－甲基－２’－吡啶基）－羰甲基吡啶碘盐４经改良的Ｋｒｏｈｎｋｅ法先制得取代三联吡啶５，然后在氩气流中，－８０℃与ＬＤＡ，氧化剂１，２－二溴乙烷反应，偶联生成新化合物６。３，４，５，６的结构经元素分析，ＩＲ，ＨＮＭＲ     

放置TCu200和TCu220宫内节育器后一年半内宫颈粘液中铜离子释放规律

用原子吸收法对使用Ｔ（Ｃｕ）２００和Ｔ（Ｃｕ）２２０型宫内节育器妇女的围排卵期宫颈粘液中铜离子浓度进行测定，以自身未带器前（Ｏ期）为对照。结果，带器者在第１，３，６，１２，１８个月宫颈粘液铜离子的平均浓度分别为；３．１８８，２．６９５，２．３２３，２．２４７，２．１１６μｇ／ｇ粘液湿重，与未带器前含铜量（０．８１８）相比，均有非常显著性差异（Ｐ＜０．０１），铜离子释放量随时间延长而逐渐减少。     

强激光在高Z等离子体中吸收的波长关系

利用“神光Ⅰ”输出的～５００Ｊ、１．０５μｍ，～２００Ｊ、０．５３μｍ激光和“星光Ⅱ”输出的～７０Ｊ、０．３５１μｍ激光，实验研究了激光与金圆盘靶作用产生的等离子体对激光的吸收，获得了激光１０°、４５°入射Ａｕ盘靶吸收的波长关系。实验结果与一维平面等离子体吸收模型计算的结果基本相符。     

GRCA(1)模型中误差方差自加权估计的渐近分布

考虑随机系数自回归模型Y_t =Φ_ty_t-1+ u_t,其中 Φ_t为随机系数,u_t为随机误差。在允许Φ_t与u_t相依以及Eu_t无穷的条件下,构造了误差方差的自加权估计,并证明了该估计的渐近正态性。最后通过数值模拟,说明 自加权估计的稳健和有效性。     

Cathodoluminescent characteristics of green-emitting ZnAl2O4:Mn thin-film phosphors

Thin films of ZnAl₂O₄:Mn were grown on aluminosilicate ceramic plates using spray pyrolysis of aqueous solutions. The cathodoluminescence (CL) properties of the films under low to medium excitation voltage (<5 kV) were investigated. The films exhibited green CL after being annealed at temperatures above 550 °C, which corresponds to the transition between ⁴T₁ and ⁶A₁ of Mn²⁺ ions located in the tetra coordination of the Zn²⁺ site in the spinel structure. The chromaticity coordinates were x=0.150 and y=0.734 with a dominant wavelength of 525 nm and an 82% color purity. The CL luminance and efficiency depended on the excitation voltage and current density. Saturation effects were observed as the current density increased. A luminance of 540 cd/m² and an efficiency of 4.5 lm/W were obtained at an excitation voltage of 4 kV with a current density of 38 A/cm². PACS 78.60.Hk     

Dark Multi-Soliton Solution of the Nonlinear Schrödinger Equation with Non-Vanishing Boundary

The inverse scattering transform for the nonlinear Schrödinger equation in normal dispersion with non-vanishing boundary values is re-examined using an affine parameter to avoid double-valued functions. An operable algebraic procedure is developed to evaluate dark multi-soliton solutions. The dark two-soliton solution is given explicitly as an example, and is verified by direct substitution. The additional motion of the soliton center is given by its asymptotic behavior.