辛算法在近地小行星轨道演化数值研究中的应用

采用改进的显算法对近地小行星的轨道演化进行数值研究，在力学模型中除考虑各大行星的引力摄动外，还考虑了后牛顿效应，而在算法上则着重探索辛算法在近地小行星轨道演化研究中的应用前景，特别是当这类小行星与某一大行星靠近时辛算法的有效性。     

S_2(B~3Σ_u~-→X~3Σ_g~-(ν′≥18,0))弥散谱带的自旋-轨道从头计算

采用从头计算方法从理论上解释了实验中双原子分子S_2(B~3Σ_u~-→X~3Σ_g~-吸收谱中谱带(18,0)开始出现的弥散现象.计算了包含自旋-轨道耦合(SOC)的B3Σu-和排斥的15Πu,23Σu 态的电子势能曲线.对于(18,0)谱带开始弥散,给出了与其他文献不同的物理解释.计算结果表明B3Σu-与15Πu,23Σu 态的SOC作用导致预解离对谱带的弥散起着决定作用,并与实验结果作了比较,符合很好.     

单驱动混沌测量电路

在参数一定条件下，利用混沌系统的初值敏感性，使系统的混沌轨道随初始值发生变化，通过测量混沌轨道的距离即可测得该小信号，本文提出了一种新的RC振荡器驱动电路，与已有的混沌测量电路相比，它采用一个压控电流源向电容提供正反方向的积分电流，实验结果表明它能改善测量电路的线性度和稳定性。     

Spin—Other—Orbit Effect in Two—Mode Multiphoton Ionization

A previously unknown “spin-other-orbit” effect of photon modes is predicted by solving a Schrodinger-like equation for a non-relativistic electron interacting with a two-mode intense photon field propagating in two perpendicular directions.A multiphoton ionization experiment to test this effect is suggested.Transition rates which manifest this effect to be measured in the experiment are calculated and presented graphically.A detailed comparison between this effect and the well-known spin-other-orbit effect of electrons is included.     

Effect of external noise on the dynamical localization of two coupling electrons in quantum dot array

The effect of external noise, which is characterized by an Ornstein--Uhlenbeck process, on the dynamical localization of two coupling electrons in a quantum dot array under the action of an ac electric field is studied. A numerical solution of the stochastic equations is obtained by averaging over stochastic trajectories. The results show that the external noise may destroy the dynamical localization, but the anti-noise capacity of the system is stronger when the two electrons are localized at the ends of the quantum dot array.     

Entrance Channel Dependence of Production Cross Sections of Superheavy Nuclei in Cold Fusion Reactions

Production cross sections of superheavy nuclei Rf and Hs for asymmetric and nearly symmetric projectile-target combinations are systematically studied within the framework of the dinuclear system model. The calculated results show that the production cross sections are strongly dependent on the symmetry of reaction systems. The obtained results are in good agreement with the available experimental data for asymmetric reaction systems.For nearly symmetric systems, the model gives opposite results with coupled channel model in which surface vibration and nucleon transfer are included.     

轨道嵌套多像全息记录

根椐椭圆的性质，介绍了将大小不同的椭圆按一定的约束条件形成轨道嵌套多像全息记录的方法。这种方法利用全息台在实验室里可进行多像全息记录，避免了实验时为了调节物光与参考光光程相等所带来的反复测量光程的麻烦，实现把同一时刻空间分离的若干物体或一个物体不同视角的信息同时记录在一张全息图上，得到这些物体的三维全息图，即全息图片上同时再现出多个物体的像，或一个物体不同位置的视图的合成。     

微扰分子轨道法在有机化学中的应用

经Dewar, Hoffmann, Epiotis, Houk, Wolfe和Kost等理论化学家的努力,PMO理论已经成为研究影响分子构型、构象和(立体专一性和区域专一性)反应产物的结构因素的一个有效的手段。Epiotis的非键轨道作用理论已经使有机化学家认识到, 一个拥挤的构象或过渡态不一定是一个能量上不利的状态。π轨道作用的分析表明, 共轭基团间的作用在本质上是相斥的, 全平面构象不是共轭效应最大的构象。WSW-like法不仅为定量PMO法提供了一组完整的、具有正确集据数的轨道基组, 而且它还成功地将轨道作用能转化为原子作用能。     

自持磁约束电子云的流体理论Ⅱ.电子云中各物理量的分布和数值计算方法

本文研究了轴对称自持磁约束电子云密度、电子温度和漂移角速度的分布,讨论了自由电离产生的离子对电子云的影响,介绍了电子云和电磁场各物理量之间的比例关系和数值计算方法.