衍射光学透镜的设计

介绍一种衍射光学透镜的通用设计方法，它适用于大的相对孔径和任意的物像共轭距离，同时考虑了透镜基板厚度的影响．设计的结果，用激光写入法加工成透镜，其成像质量达到衍射极限．     

1,4-苯二硫醇分子的表面增强共振拉曼散射的化学增强

利用密度泛函和含时密度泛函理论方法研究了1,4-苯二硫醇分子在两个金团簇之间的表面增强拉曼散射及表面增强共振拉曼散射光谱. 采用对应四种不同形式的电荷转移激发态能量的入射光,计算了表面增强共振拉曼光谱. 结果显示,光谱增强的效果与电荷转移的形式密切相关. 不同的电荷转移形式对增强因子的贡献是有差异的.     

离子交换剂应用文摘

标题的聚合物由具有重复单元I(R=H,烷基)的巨大的线型聚合物和作为掺杂物的强酸阳离子交换树脂的络合物组成。在(NH_4)_2Cr_2O_7存     

超高交联聚苯乙烯吸附剂的合成,结构与性能

本文总结了超高交联聚苯乙烯的各种合成方法，对干态下和溶胀态下超高交联聚苯乙烯的结构进行了评述，并介绍了超高交联聚苯乙烯独特的溶胀性能和优良的吸附性能．引用参考文献３２篇。     

O2（^1Δg）二聚物的兰色激光振荡

通过微波激励高纯氧产生Ｏ２（＾１Δｇ）二聚物，利用放大自发辐射法首次测得了Ｏ２（＾１Δｇ）聚物在４８６ｎｍ处的小信号增益系数。采用平凹稳定谐腔观察到了４８６ｎｍ的兰色激光振荡，最大激光输出功率为１３０μＷ，发散角为２８ｍｒａｄ。     

交联聚苯乙烯强—弱碱树脂的合成及脱色性能研究

交联聚苯乙烯氯甲基化后，分别与甲胺（或二甲胺）、三甲胺（或α－甲基吡啶、二甲基乙醇胺）混合胺化试剂进行亲核取代反应，合成了一系列同时带有强－弱碱功能基的交联聚苯乙烯树，并表征了这些树脂的结构，测定了树脂对甜菊甙的脱色性能，结果表明，这些树酯功能基碱性适中，脱色容量较高，甜菊甙损失较少，再生效率高。     

Impacts of the Soft—Gluon Exchanges on B→ππ Decays

We have investigated the role of soft-gluon exchanges in B→ππ,using the light-cone sum rules in quantum chromodynamics,The calculations are carried out not only for the tree operators but also for the penguin operators.We conclude that soft-gluon exchanges contribute to the decay amplitudes,noticeably on some decay channels,and thus cannot be neglected.     

光学/数字混合图像处理用于星体斑点干涉术的模拟实验

本文介绍一种光学/数字混合图像处理方法,它可用于星体斑点干涉术,以克服大气扰动的影响,使天文望远镜达到理论衍射极限.混合处理系统包括相干光傅里叶交换装置、光学输出数字化的显微密度计和微计算机三部分。在简单分析星体斑点干涉术数据处理的要求之后,本文将叙述系统各部分的组成和设计,介绍处理模拟星体图像的结果,讨论今后的发展和其它可能的应用。     

Restoration of solar and star images with phase diversity-based blind deconvolution

The images recorded by a ground-based telescope are often degraded by atmospheric turbulence and the aberration of the optical system.Phase diversity-based blind deconvolution is an effective post-processing method that can be used to overcome the turbulence-induced degradation.The method uses an ensemble of short-exposure images obtained simultaneously from multiple cameras to jointly estimate the object and the wavefront distribution on pupil.Based on signal estimation theory and optimization theory,we derive the cost function and solve the large-scale optimization problem using a limited memory Broyden- Fletcher-Goldfarb-Shanno (L-BFGS) method.We apply the method to the turbulence-degraded images generated with computer,the solar images acquired with the swedish vacuum solar telescope (SVST,0.475 m) in La Palma and the star images collected with 1.2-m telescope in Yunnan Observatory.In order to avoid edge effect in the restoration of the solar images,a modified Hanning apodized window is adopted. The star image still can be restored when the defocus distance is measured inaccurately.The restored results demonstrate that the method is efficient for removing the effect of turbulence and reconstructing the point-like or extended objects.