In-Situ Characterization of Three-Dimensional Optical Matters by Light Diffraction

Three-dimensional optical matters are created by combining the single beam optical trapping with the conventional Z-scan technique. Dynamic light diffraction is employed to evaluate the structure and quality of the optical matter formed at the optimum trapping power. The lattice constant of the optical matter is extracted based on the Bragg and Snell laws, showing that polystyrene spheres are nearly close-packed in the optical matter, confirmed by comparing the diffraction pattern of the optical matter with that of a colloidal photonic crystal fabricated by the self-assembled technique. The relatively broad diffraction peaks observed in the optical matter indicate that the density of disorders in it is higher than that in the photonic crystal. It is suggested that the optical matter possesses a random close-packed structure rather than a face centered cubic one.Three-dimensional optical matters are created by combining the single beam optical trapping with the conven- tional Z-scan technique. Dynamic light diffraction is employed to evaluate the structure and quality of the optical matter formed at the optimum trapping power. The lattice constant of the optical matter is extracted based on the Bragg and Snell laws, showing that polystyrene spheres are nearly close-packed in the optical matter, confirmed by comparing the diffraction pattern of the optical matter with that of a colloidal photonic crystal fabricated by the self-assembled technique. The relatively broad diffraction peaks observed in the optical matter indicate that the density of disorders in it is higher than that in the photonic crystal. It is suggested that the optical matter possesses a random close-packed structure rather than a face centered cubic one.     

基于压电效应的光电子集成技术研究进展（特邀）

压电效应是一种实现电能与机械能之间相互转换的重要物理现象。随着集成光电子技术和压电薄膜材料制备技术的日益成熟,压电效应在光电子集成芯片领域引起广泛的研究。在压电效应的作用下,外部电场可以操控薄膜材料的形变,从而改变折射率,实现光电调谐和声光调制。本文首先介绍常见压电薄膜材料及其研究进展,随后回顾和探讨基于压电效应的光电子集成器件的研究进展。最后,对压电调谐器件和声光调制器的应用进行介绍和展望,分析其大规模应用面临的挑战和问题。     

局部不变投影

提出了高维数据集处理的局部不变投影方法.该方法在高维数据的降维处理中具有保持数据集几何结构和拓扑结构不变的性质,并且兼有线性降维方法计算方便、快捷的优点.另外,正则化处理使该方法具有良好的稳健性.计算结果表明,该方法具有发现数据集非线性结构的能力.     

基于辛方法的二维非稳态热传导问题研究

基于二维热传导理论,通过引入对偶变量,推导了非稳态热传导温度场问题的辛对偶方程组。采用分离变量法和本征展开方法,建立起一种本征值和本征解的直接求解方法,得到了适用于任意跨厚比的平面非稳态问题的解析解。由于在求解过程中不需要事先人为地选取试函数,而是从基本方程出发,直接利用数学方法求出问题的解,使得问题的求解更加合理化。探讨不同跨厚比、不同时间步长情况下温度和热流密度的分布规律,并与已有解进行比较。结果表明,辛方法是一类可行的研究非稳态热传导的方法。考虑到非零本征值本征解具有局部性特点,进一步讨论不同跨厚比、不同时间情况下温度和热流密度分布的端部效应问题。为非稳态问题的理论及实际应用研究提供了新的途径。     

TZT/AC/PMMA体系光谱烧孔及激光诱导的填孔效应的研究

报道四苯并卟啉锌/芳晴/有机玻璃TZT/AC/PMMA体系光化学烧孔的光谱稳定性、多重烧孔及激光诱导的填孔效应。 关键词：     

食品中乳酸的快速气相色谱分析

由于乳酸菌的作用,在用发酵方法生产的食品及酸败变质食品中均含有一定量乳酸。故食品中乳酸含量的高低对其风味和卫生质量评价具有一定的参考价值。     

“互联网+医疗”支付技术的研究与思考

正近年来,互联网+技术与医疗健康行业已开始深度融合。在国家政策及技术发展的共同推动之下,我国互联网+健康医疗应用已呈现百花齐放之势,以支付为切入的互联网+技术的发展已趋于完善。本文简要分析了国内外第三方支付的发展现状,以及医疗支付行业的变革,对互联网+时代医疗行业费用结算与管理提出新的思考,并对互联网+时代下的医疗健康做了进一步的展望。     

Dark blue erenkov second harmonic generation in the two-layer-stacked hexagonal periodically poled MgO:LiNbO_3s

We report the dark blue nonlinearˇCerenkov radiation by the second harmonic generation(SHG)in a two-layer-stacked hexagonal periodically-poled-MgO:LiNbO3s(PPMgOLNs).Based on the direct wafer bonding of two target PPMgOLNs rotating around the axis perpendicular to the plane with an angle of 30°,twelve bright spots as twice of those in a single PPMgOLN are shown at each second-harmonicˇCerenkov ring.The experimental results agree with the theoretical ones and present a promising application in the fabrication of three-dimensional(3D)PPMgOLNs.     

4-(5-溴-2-噻唑偶氮)间苯二酚反相阳离子对HPLC测定痕量铌、钒、铑、铬

本文报道新试剂4-(5-溴-2-噻唑偶氮)间苯二酚(5-Br-TAR)为柱前衍生试剂,以阳离子表面活性剂作为对离子试剂,用含15 mmol／L的pH 5.8的乙酸-乙酸钠缓冲溶液、0.05 mmol／L溴化钠、10 mmol／L TBA·Br的乙腈-甲醇-水(42 : 13：45,V／V／V)三元体系为流动相,在C8柱上25min内HPLC测定了Nb(V)、V(V)、Rh(Ⅲ)和Cr(Ⅵ)的5-BR-TAR螯合物。当SNR=2时,检出限分别为Nb(V)1.0、V(V)1.6、Rh(Ⅲ)0.9和Cr(Ⅵ)1.9μg／L。该方法用于测定污水中的铬和钒,结果良好。     

1α-羟基去氢表雄酮的合成

本文以1,4-雄烯二酮为起始原料,经羰基保护、溴代、异构化、羰基还原、环氧化、开环及脱保护7步反应以28.3%的总收率合成1α-羟基去氢表雄酮。该方法具有高效经济、技术可行、安全环保等优点,为1α-羟基去氢表雄酮的规模生产及维生素D类药物合成研究奠定理论基础。