平行电磁场中He+2的回归谱与闭合轨道的研究

利用半经典闭合轨道理论和分区自洽迭代方法计算了Rydberg态下He⁺₂在平行电磁场中的回归谱与闭合轨道. 为了模拟分子实的散射作用,引入一个包含电子交换势的新势能. 利用这一新势能,结合多通道量子亏损和分子闭合轨道理论,讨论了分子实散射效应对平行电磁场中He⁺₂的回归谱与闭合轨道的影响. 关键词： 回归谱 分子半经典闭合轨道 交换势 实散射     

Reliable Lateral Manipulation of Single Adatom on Metal fcc（lll） Surfaces with a Single-Atom Tip

Using molecular statistics simulations based on the embedded atom method potential, we investigate the reliability of the lateral manipulation of single Pt adatom on Pt（111） surface with a single-atom tip for different tip heights （tip-surface distance） and tip orientations. In the higher tip-height range, tip orientation has little influence on the reliability of the manipulation, and there is an optimal manipulation reliability in this range. In the lower tip- height range the reliability is sensitive to the tip orientation, suggesting that we can obtain a better manipulation reliability with a proper tip orientation. These results can also be extended to the lateral manipulation of Pd adatom on P d （111） surface.     

AFM Study on the Formation Mechanism and Microstructure of Ni Atomic Aggregates on Liquid Substrates

We study the formation mechanism and microstructure of nickel （Ni） atomic aggregates on the silicone oil surfaces by atomic force microscopy （AFM）. Initially, the deposited atoms nucleate and form the compact clusters on the liquid surfaces. Then they perform Brownian motion and adhere upon impact. Finally the branched aggregates are formed. The Ni aggregates exhibit granular structure. The mean size of the granularities in the aggregates is of the order of 10 nm and it decreases with the nominal film thickness. The experiment shows that the Ni aggregates perform a directional diffusion towards the sample edge. The interpretation for this phenomenon is presented.     

基于荧光光谱法的钞票识别技术

以光栅光谱仪为基础,光电倍增管作为探测器,运用VC++语言设计了计算机采样界面,形成了荧光光谱分析的钞票识别光电系统。在紫光灯激发下,对钞票进行了荧光光谱特性分析,设计了基于荧光光谱分析的钞票识别光学系统、光电信号的检测和信号处理系统。测试结果表明：真假币的荧光光谱曲线有着明显的区别,它们的峰值分别为545nm和525nm。设计的荧光光电系统灵敏度高,可靠性好。     

宽光束进入展宽器提高输出脉冲对比度分析

根据分析啁啾脉冲对比度模型,通过光线追迹法详细分析了展宽器对输出脉冲对比度的影响.发现当扩大进入展宽器的入射光束口径,从2 mm扩大到40 mm时,输出脉冲的对比度提高了近两个数量级;同时发现在相同条件下,当输入脉冲为双曲正割函数时,其输出脉冲的对比度明显好于输入脉冲为高斯脉冲和矩形脉冲的情形.     

氧化还原反应概念意义建构的教学研究

意义建构是概念教学的最终目标。在概念教学中建构意义就是帮助学生形成对概念较深刻的理解,提高他们运用概念解决问题的能力。从氧化还原反应概念的学习属性出发,分析了它在教学中应建构的意义,并从概念的科学研究角度进入新课程学习,以分类概念学习原理为构建概念的教学基础,以学生自主探究设计教学过程,并进行了实践研究。     

干涉项对e~+e~-→q+ng两种色连接几率的影响

传统高能e+ e-→hadrons事例产生器普遍采用大Nc 近似 ,使色单态链产生几率达到 10 0 %而色分离态几率为 0 .本文在Nc=3的真实情况下 ,研究了干涉项中颜色部分和动量部分的来源及性质后发现 ,对e+ e-→qq +ng部分子末态中胶子数 2 ,3,干涉项使色单态链产生几率进一步下降到 6 7% ,5 8% ,而n =2时的色分离态几率则增大至不考虑干涉项的 2倍 .由上推断当胶子数n更大时色单态链几率将远小于 1,色分离态几率将更显著增加     

HOW DOES AN IMPERFECT SYSTEM AFFECT THE MEASUREMENT OF SQUEEZING?

The effect of an imperfect system on the measurement of squeezing is studied. It is shown that the imperfectly efficient detectors and the unbalance of the beam-splitter will reduce the measured squeezing. The effects on quadrat ure phase squeezing and photon number squeezing are different from the usual balanced homodyne detection.     

广义双正则函数向量的非线性边值问题

利用Schauder不动点定理和积分方程的方法，讨论了实Clifford分析中广义双正则函数向量的非线性边值问题解的存在性及其解的积分表达式。     

平面几何问题三角化的一条有效途径——一个常见命题的推广及应用

平面几何问题三角化的一条有效途径──一个常见命题的推广及应用谢水龙（贵州六枝郎岱二中５５３４０５）１来源命题若Ｐ为ＺＸＯＹ—１２０“平分线上一点，过点Ｐ的直线截ＯＸ、ＯＹ于点Ａ、Ｂ．则＿十＿一ＭＭ．””“ＯＡ’ＯＢＯＰ这是一道以往的教材中常能见到的普...