环形孔径高斯光束的远场特性

 讨论了环形孔径高斯光束的远场光斑能量分布,并给出了拟合表达式。首先推导了光束没有抖动时远场光斑的光能分布表达式,然后研究了各种不同中心遮拦和不同光束截断比, 在有以及没有激光束抖动的情况下,对高斯光束的远场环围能量的分布变化的影响。     

相干滤波成像系统测量光学元件表面疵病

本文利用相干高通滤波成像系统对光学元件表面疵病进行了测量 ,提出了等效疵病面积的概念及计算公式 ,由等效疵病面积可计算出与 GB1185 - 89对应的疵病等级 J。实验装置的分辨率为 10μm,并具有可靠的表面疵病等级评价     

233U和武器级钚的爆炸产物放射性衰变过程的比较

对233U模型和武器级钚模型核爆炸后爆炸产物的放射性活度、生物潜在危害因子和能量沉积等量进行了比较 ,分析了武器级钚模型中上述各量的演化情况. Comparison on the nuclear explosive products ’ radioactivity, biological hazard potential, energy deposition after nuclear explosion between the model of 233 U and the model of weapon grade plutonium was made. The detail analysis of the process of above physics quantities in the model of weapon grade Plutonium was also given.     

竹红菌素自敏光氧化反应机制的研究

本文对竹红菌素自敏光氧化反应的机制作了较详细的研究,竹红菌素通过自敏光氧化反应生成不稳定的过氧化物,它可以放出¹O₂回到母体化合物,也可以转化为稳定的氧化产物,我们用活泼的单重态氧的接受体捕获到了体系中放出的¹O₂,用吸收光谱的变化证明过氧化物回到了母体化合物。文中还用猝灭实验证实此自敏光氧化反应除涉及¹O₂机制外,还有其它机制起着作用。     

Properties of One Oxygen Hole Motion in a Quantum Antiferromagnet

By making use of the equation of motion of the Green's function method and the selfconsistent nondiagonal Fock approximation technique, we present a systematic analysis of the ground state properties of one-hole doping in the cupric oxides for the two-band model. The quant urn Bogoliu bov-de Gennes formalism is developed to study the renormalized hole motion with the effects of local distortion of spin configurations. The ground state wave function, the ground state energy and the effective mass are derived. The calculations are carried out with the variational approach.     

The Contribution of the Fourth Order Exchange Diagrams to The Relativistic Microscopic Optical Potential

The contribution of the fourth order exchange diagrams is first studied to the imaginary part of nucleon self-energy,the relativistic microscopic optical potential and the Schrodinger equivalent potential of the relativistic microscopic optical potential based on Walecka's meson-nucleon model.     

Fluorescence Properties of Ce+3-doped BaF2

The spectra and decay times of a serious of Ce⁺³—doped BaF₂ crystals have been determined.The results demonstrate that a BaF₂ crystal with a proper amount of Ce⁺³ doped have some outstanding advantages:a near-blue fluorescence with quite fast decay time (80ns) replaces the slow component (600ns) and vary fast one (～0.8ns) of undoped BaF₂.The intensity of the new component is comparable with the sum of the old ones.     

无胺合成[Fe]ZSM-5分子筛的结构鉴定及其催化性能的研究

不用有机胺为模板剂,在碱性介质中采用水热合成法成功地合成了[Fe]ZSM-5分子筛.用X射线衍射、透射电镜、红外光谱、顺磁共振谱、X射线光电子能谱和穆斯堡尔谱等对其结构进行了表征,结果表明,Fe原子进入了分子筛骨架,并处于四面体的配位环境.在由甲醇转化为汽油的过程中,以本文合成的[Fe]ZSM-5与用有机胺为模板剂合成的[Fe]ZSM-5分子筛为催化剂相比,其活性和选择性几乎相同,且都比通常的H[Al]ZSM-5好,C₅组分以上的选择性大于80%,且芳烃(包括脂环烃)和异构烃的含量达75%以上.     

金属酞菁激发态与氧的相互作用

比较了几种金属酞菁光敏产生单重态氧和超氧负离子的能力,结果表明它们产生¹O₂的能力与中心金属的电子结构有关,取决于三重态寿命和量子产率。顺序如下:Zn>Ga>Cu>H₂>Al>Co。产生O₂^·-的能力不仅与三重态寿命和量子产率有关,也与激发能和氧化还原电位有关。其顺序如下:Ga>Al>Cu>Zn。还研究了酪氨酸与镓酞菁激发态相互作用,酪氨酸猝灭镓酞菁荧光。在除氧条件光激发下,酪氨酸猝灭镓酞菁的激发三重态发生电子转移,检测到GaTSPc^-在560nm处的瞬态吸收,在氧的存在下进一步反应生成O₂^·-。     

Investigations on if-E Curve in Cyclic Derivative Chronopotentiometry (Ⅴ)——A Microcomputer-based Data Acquisition System for if-E Curve Measurements

Introduction Quantitative analysis in cyclic derivative chronopotentiometry(CDC) is based on the measurement of the depth of incision on the (dE/dt)～E curve. A serious disadvantage of the method is that a large charging current obscures the measurement. To improve the sensitivity and the accuracy of CDC, a microcomputer-based data acquisi-