光子扫描隧道显微镜的光电成像系统研究

本文论述了光子扫描隧道显微镜（ＰＳＴＭ）的显微成像机理、成像规律，针对具体的物理模型进行数值模拟计算，并得到了与实际探测相一致的场分布规律。采用自行研制的光子扫描隧道显微镜（ＰＳＴＭ）的显微实验系统对多种样品进行了表面显微成像研究，获得了关于样品表面三维立体图像信息，通过多种图像处理手段对原始图像进行后期处理，得到了更具视觉效果、更为逼真的样品表面图像。     

用光电法测量刚体的转动惯量──对波纹法测量刚体转动惯量的改进

用Ｊ─ＬＤ２转动惯量测试仪的波纹法测试转动惯量的实验方法，测量精度差，操作不方便．利用实验室现有的仪器改进成光电法测试转动惯量的方法，简单易行，测量精度高，操作方使，实践效果良好．     

BaFCl_（x）Br_（1－x）：Sm~（2＋）中_（5）D_2→~（7）F_

本文以ＢａＦＣｌｘＢｒ－１－ｘ：Ｓｍ２＋Ｄ２→７Ｆ０的跃迁几率随ｘ变化为中心对ＢａＦＣｌｘＢｒ－１－ｘ：Ｓｍ２＋体系４ｆ５ｄ带的激发光谱、５Ｄ２→７Ｆ０跃迁的荧光衰减随温度的变化特性、５Ｄ２→７Ｆ０的跃迁几率等进行了研究．从而得出结论：在ＢａＦＣｌｘＢｒ１－ｘ：Ｓｍ２＋中，随Ｂｒ含量的增大，４ｆ５ｄ带与５Ｄ２能级更加接近，使７Ｆ０→Ｄ２的吸收截面增大，从而可能提高在５Ｄ２：能级烧孔的效率．     

Multivariate Refinement Equations and Convergence of Cascade Algorithms in Lp（0〈p〈1）Spaces

We consider the solutions of refinement equations written in the form

Studies on self-pumped phase conjugation in Cu-doped (K0.5Na0.5)0.2(Sr0.61Ba0.39)0.9Nb2O6 crystals

The use of Cu-doped (K_0.5Na_0.5)_0.2(Sr_0.61Ba_0.39)_0.9Nb₂O₆ as self-pumped phase conjugators using internal reflection is reported. Reflectivities as high as 63% at 5145.5 nm and 60% at 632.8 nm were realized. It was found that the photorefractive response changes significantly at different doping concentration. The responses of the crystals to the laser wavelength, incident angle and dopant concentration are studied.     

On the Exceptional Zeros of Rankin–Selberg L-Functions

The main objects of study in this article are two classes of Rankin–Selberg L-functions, namely L(s,f×g) and L(s, sym²(g)× sym²(g)), where f,g are newforms, holomorphic or of Maass type, on the upper half plane, and sym²(g) denotes the symmetric square lift of g to GL(3). We prove that in general, i.e., when these L-functions are not divisible by L-functions of quadratic characters (such divisibility happening rarely), they do not admit any LandauSiegel zeros. Such zeros, which are real and close to s=1, are highly mysterious and are not expected to occur. There are corollaries of our result, one of them being a strong lower bound for special value at s=1, which is of interest both geometrically and analytically. One also gets this way a good bound onthe norm of sym²(g).     

自适应光学中的非等晕性

本文讨论了自适应光学中非等晕域对补偿效果的影响,提出了一种减小非等晕性误差的新方法—位相梯度法。分析结果表明,该方法可显著增大有效校正的角范围,使非等晕性误差的影响大大减小。我们预期位相梯度法有望解决自适应光学中信标的非等晕性问题。     

铝酸锶铕的合成与发光的研究

本文详细报导4(SrEu)O·7Al2O3.磷光体的合成及激活剂Eu2+离子浓度、硼酸、五氧化二磷等对磷光体发光强度,发射光谱和激发光谱的影响.讨论了不同Eu2+离子之间的能量传递.测量了不同Eu2+浓度下磷光体的荧光寿命和长余辉特性.     

HIRFL注入器PIG离子源的研制

本文介绍了兰州重离子加速器(HIRFL)的注入器(SFC)所用PIG离子源的研制和改进工作,使用新研制的PIG源,已在注人器SFC上获得了5μA的O_(16)~(5+)及10μA的C_(16)~(4+)的离子束。     

超大规模集成电路光学光刻技术的现状与展望

光学光刻是目前超大规模集成电路(VLSI)制备中主要的微米和亚微米的图形加工技术,这一技术将继续保持其主导地位成为90年代VLSI发展的关键。本文综述了近年来光学光刻工艺的发展,主要介绍了G线(436nm)、Ⅰ线(365nm)和准分子激光光刻的现状,并对实现高的光学光刻分辨率所必须解决的透镜设计、套准精度和像场面积等问题作了详细描述。最后展望了发展方向、