微波辅助萃取法/高效液相色谱-串联质谱法对减肥保健食品中非法添加药物奥利司他的测定

建立了测定减肥保健食品中非法添加药物奥利司他的高效液相色谱-串联质谱分析方法.减肥保健食品经微波辅助萃取后,经Waters Atlantis T3柱(3 μm,150 mm×2.1 mm)分离,采用多反应监测正离子模式检测,定性离子对为m/z 496.3＞319.2、m/z 496.3＞160.0,定量离子对为m/z 496.3＞160.0.结果表明,奥利司他的仪器检出限为0.2 μg/L;在0.2 ～500 μg/L范围内呈良好的线性关系,相关系数为0.999 7.在低、中、高3个添加水平范围内的平均回收率为86% ～104%;日内精密度均小于6%,日间精密度均小于8%.方法分析速度快、灵敏度高、重复性好,可用于不同减肥保健食品中非法添加奥利司他的快速检测.     

基于分析型KANO模型的物流服务质量提升决策方法

针对Kano模型定性、分类准则主观的局限,提出一种分析型Kano模型的设计方法,通过构建Kano满意度指标和重要度指标,实现质量因素的客观化分类;设计Kano模型决策指标,获取提升服务质量属性的优先权。在分析基于分析型Kano模型的物流服务质量提升决策过程的基础上,从实证视角研究了模型的具体应用问题。     

ZnSe(ZnS)纳米晶与MEH-PPV的共掺有机电致发光器件

采用水相法合成核壳结构ZnSe/ZnS 纳米晶,经X射线衍射(XRD)分析和透射电子显微镜(TEM)表征,证实所制备的样品为立方晶型闪锌矿结构ZnSe/ZnS量子点。按照一定的质量比将ZnSe/ZnS 纳米晶和有机聚合物MEH-PPV(poly ) 共掺并将其作为发光层,分别制备单层和多层有机电致发光器件,结构为ITO/MEH-PPV∶ZnSe(ZnS)(50 nm)/Al和 ITO/PEDOT∶PSS(70 nm)/ MEH-PPV∶ZnSe(ZnS)(50 nm)/BCP(15 nm)/Alq₃(12 nm) /LiF(0.5 nm)/Al。实验结果表明,多层发光器件的发光特性与单层器件不同,工作电压的增大使其发光峰发生了明显的蓝移。     

Influence of Annealing on Properties of ZnO Films Grown via Plasma－enhanced MOCVD

The structural and the optical properties of ZnO films with high quality grown via plasma-enhanced met-al-organic chemical vapour deposition(MOCVD) on C-plane sapphire substrate were studied. The crystallini-ty and the optical properties of the films are greatly improved having been annealed in oxygen plasma atmo-sphere. The structure, the band gap and the binding energy of O1s electrons, and the molar ratio of O to Zn were determined by X-ray diffraction (XRD), photoluminescence (PL) and X-ray photoelectron scan meth-ods. For both the annealed and the as-grown films, the exciton peak features were observed at room temper-ature. The band-edge photolof the annealed film is much stronger than that of the as-grown film, and the exciton peak relating to the deep level at 439 nm disappears. The molar ratio of O to Zn in the annealed film is 0. 91, while it is 0. 78 for the as-urown film.     

毛细管硅胶基质整体柱的制备及其电色谱性能研究

采用热引发一步法制备了毛细管电色谱硅胶基质整体柱。通过使用表面活性剂(十二烷基磺酸钠)增加了反应液中两相之间的相互溶解,使得反应液最终成为均相溶液,实现了硅胶整体柱的均相聚合制备。所制备的均相硅胶整体柱内部结构更加均匀,大大提高了分离度。评价了该整体柱的电色谱性能,深入探讨了有机溶剂比例、pH值、电压以及温度等电色谱操作条件对电渗流、保留机理和柱效的影响。在该均相硅胶基质整体柱上成功地分离了9种中性物质(硫脲、苯、甲苯、乙基苯、正丙苯、萘、正丁基苯、芴和蒽)以及7种中性、酸性和碱性物质(硫脲、邻氨基酚、苯酚、苯、邻甲苯胺、α-萘胺和2,4-二氯苯胺)。该柱对硫脲的柱效超过110000塔板/m。     

Crystallographic Texture and Domain Structure of Nd3:8Dy0:7Pr3:5Fe86Nb1B5 Nanocomposite Prepared by Direct Rapid Solidification

"Strong crystallographic texture and high performance of Nd3:8Dy0:7Pr3:5Fe86Nb1B5 (containing 30% ff-Fe) nanocomposite permanent magnetic material was prepared by direct rapid solidification. X-ray diffraction analysis and magnetic measurement indicated that the ribbons had preferential orientation. The easy magnetization direction switched from perpendicular to the ribbon plane to parallel to the ribbon plane direction as the wheel speed increased from 10 m/s to 30 m/s. The multigrain domains were observed by scan probe microscope (SPM) in the ribbons prepared at wheel speed of 10-30 m/s. The Henkel plots were employed to investigate the interactions of the grains in the samples. A very fine and uniform microstructure with the average grain size about 16 nm was obtained in the sample prepared at wheel speed of 30 m/s. The sample consisted of highly oriented hard magnetic phase (Nd,Dy,Pr)2(Fe,Nb)14B and soft magnetic phase ff-Fe. High performance of Br=1.29 T, Mr/Ms= 0.76 and (BH)max=158.4 kJ/m3 was achieved due to the strong crystallographic texture, fine and homogeneous microstructure and enhancement of the exchange coupling between the soft and hard magnetic phases in this sample. The mechanism of the formation of the crystallographic texture and the multigrain domains was also discussed."     

FURTHER DISCUSSION ON THE EQUATION AND ITS SOLUTIONS FOR THE BOUND STATES OF MESONS

We continue the investigation of the equation and its solutions for the bound states of mesons discussed previously, emphasizing on large values of v, a parameter characterizing the shape of the potential. The results show that the dependence of the eigenvalues λ and some related physical quantities upon the potential parameters v and E is approximately the same as in our previous work. But the average radii of the bound mesons cease increasing as v increases. For each value of v, there exists a maximum average radius√<R²>_max, and all these √<R²>_max are approximately equal to 12.6 M^-1 （M being the mass of the straton）, which is much smaller than the experimental value of the radius of the π meson. However, if we assume, in addition to the attractive potential, there exists, for the straton-anti-straton superstrong interactions, also a repulsive potential, and, in particular, if we introduce a differencetype potential V_D（r） corresponding to the potential V_v（r） in our previous work, the calculated radii of the bound mesons do approach the experimental value.     

新荧光试剂5-(4'-卤代-2'-羧基苯偶氮)绕丹宁的合成及分析化学特性研究

合成了三种新荧光试剂,5-(4'-氯-2'-羧基苯偶氮)绕丹宁(CRACP.2).5-(4'-溴-2'-羧基苯偶氮)绕丹宁(BRACP,3)及5-(4'-碘-2'-羧基苯偶氮)绕丹宁(IRACP,4).研究了它们的吸收光谱及荧光性质.探讨了分子结构与荧光性能的关系.建立了铜(Ⅱ)的荧光分析方法.在pH5.3时.CRACP与铜( Ⅱ) 形成荧光螯合物, λ~ e~ x/ λ~e~m=310nm/408nm.检测限为5×10^-^4μg/g.     

Banach空间上的左可逆算子的稳定性

主要讨论了Banach空间上左可逆算子在线性运算上的稳定性及一些摄动问题，并通过反例证明了对于Banach空间上的左可逆算子A和B，R（A）∩R（B）＝{0}不是λA＋B（λ∈C）为左可逆算子的必要条件。