一例进口“铜精矿”的属性分析研究

采用X射线荧光光谱、X射线衍射等技术,结合超景深显微镜、扫描电镜、化学分析等手段,对一例申报为“铜精矿”的样品进行外观形貌、元素组成、物相组成、微观等进行分析。结果表明：样品含有黄铁矿、石英、孔雀石、硅锌矿、滑石等天然矿物,还含有大量的微米级球状氧化锌、玻璃态的钠钙硅铝酸盐、疏松的胶态硅酸盐以及条状、片状的金属铜屑等。样品的特征与天然铜矿浮选得到的铜精矿有显著差别,呈现出天然矿物和多种冶炼加工产物的混合物特征。     

N-未取代和N-芳基取代的富勒烯吡咯啉：富勒烯官能团化的新的合成砌块

C₆₀, 甘氨酸或N-芳基化的甘氨酸以及脂肪醛或酮在回流的甲苯或氯苯中反应, 制备出两个系列的稳定的可溶性的富勒烯四氢吡咯衍生物. 这些新的富勒烯衍生物可以作为有用的前体制备更加官能团化的富勒烯衍生物.     

高能物理中的Bell不等式

评述了在高能物理中检验量子力学的完备性, 特别是检验Bell不等式的研究工作进展情况, 简略地介绍了Einstain, Podolsky和Rosen (EPR)佯谬及其相应的光子实验得到的结果. 概括地阐述了在高能物理中早期利用粒子衰变中的自旋关联以及后来用中性介子的混合形成的准自旋纠缠态检验Bell不等式的各种尝试, 给出了K⁰和B⁰系统的相关实验结果. 介绍了一种可在φ工厂中实施实验检验的, 基于非最大纠缠态的新的方案. 最后还讨论了把这一实验方案推广到τ-粲工厂的可能性.     

Nonthermal effect of dilatonic black holes

The quantum nonthermal effect of the spherically symmetric and rotating dilatonic black holes is studied. A crossing of the positive and negative Dirac energy of particles occurs near dilatonic black holes. We find that the dilaton coupling parameter α affects the energy of spontaneous radiant particles. The energy of particles decreases when the coupling parameter α increases.     

Properties of spacetimes with magnetic dipoles

The properties of an asymptotically flat spacetime with a mass and a magnetic dipole are studied. We focus on the breaking of spherical symmetry by the magnetic dipole. We investigate the geometry of the spacetime through the trajectories of null geodesics and the embedding diagrams of various hypersurfaces, included constant t and r surfaces and the infinite red shift surface. We find that the effects of the magnetic dipole on the spacetime are larger at the poles than on the equator.     

模型药物毒性血清^1H NMR谱代谢组学的Fisher判别分析研究

基于核磁共振技术的代谢组学是近年发展起来的一种新的组学技术,主要利用生物体液的核磁共振谱提供生物体内全部小分子代谢物的丰富信息.然而,噪声的存在影响了模式识别方法分析的准确度.近年来小波变换以其多分辨率分析的特性、方法简单、快速等优点成为一种有效的去除分析信号噪声的方法.本实验通过运用小波变换去除噪声、校正基线后,再进行Fisher判别分析,得到了较传统分析更为清晰的代谢标识物,建立了良好的代谢模型.     

A potential red phosphor ZnMoO4:Eu for light-emitting diode application

Motivated by the need for new red phosphors for solid-state lighting applications Eu³⁺-doped ZnMoO₄ was prepared by solid-state reaction and its photoluminescence properties were investigated. Compared with Ca_0.80MoO₄:Eu_0.20³⁺, the obtained Zn_0.80MoO₄:Eu_0.20³⁺ phosphor shows a stronger excitation band near 400 nm as well as enhanced red emissions (under 393 nm excitation). The strong red-emission lines at 616 nm correspond to the forced electric dipole ⁵D₀→⁷F₂ transitions on Eu³⁺. The chromaticity coordinates (x=0.63, y=0.37) are close to the standard of National Television Standard Committee (NTSC). The optical properties suggest that Zn_0.80MoO₄:Eu_0.20³⁺ is an efficient red-emitting phosphor for LED applications.     

Introducing difluoromethylene sulfonamide group via nucleophilic addition of difluoromethylene anion with aromatic aldehydes

A new fluorine-containing synthon, R¹COCF₂SO₂R² (2, R¹, R²=morpholino, piperidino, etc.), was developed for the introduction of difluoromethylene sulfonamide or difluoromethylene group. Under different conditions, 2 reacted readily with aromatic aldehydes to give the corresponding difluoromethylene-containing alcohols or diols in moderate to good yields in the presence of potassium tert-butoxide. Difluoromethylene sulfonamide group was introduced into organic compounds directly for the first time by this method.     

毛细管柱-顶空气相色谱法测定化妆品中的甲醇

建立了毛细管柱-自动顶空气相色谱法测定化妆品中甲醇的方法.研究了样品平衡温度、样品平衡时间、盐析剂等实验条件对测定结果的影响.甲醇含量在9.504-594.0mg/L浓度范围内线性关系良好,相关系数（r）为0.99998.在50-250μg/g添加水平的回收率为90.4％-105.6％,检出限为49.9μg/g.实验结果证明,该方法适于化妆品中甲醇含量的检测.