Cross sections for rotational excitation in He－H2 collisions

Close coupling calculations have been carried out for rotational excitations in He－H₂ collisions with symmetric isotopic substitution (He－H₂, D₂, T₂) and asymmetric isotopic substitution (He－HD, HT, DT). Cross sections have been obtained at the incidence energy of 0.3eV. Based on the calculations, the effect of isotopic substitution on atom－diatom collisions is discussed.     

ALGEBRAIC APPROACH TO THE ROTATIONVIBRATIONAL SPECTRA FOR DIATOMIC MOLECULES

The symmetry of group U(3) can be used to get the rotationvibrational spectra of a diatomic molecule without solving the schroedinger equation.     

简化Hodgkin-Huxley反应-扩散方程描述的可激活介质中的旋转波

对一个由简化Hodgkin-Huxley反应 扩散方程描述的可激活介质的运动进行数值计算，在一定的初始条件和边界条件下，获得了稳定的旋转波解．根据可激活介质的特点，把模型近似为一些比较简单的形式，从这些近似形式出发，对旋转波产生的原因在理论上进行了定性分析 关键词：     

Gamow—Teller Resonance of 90Zr in a Relaztivistic Approach

We establish the formalism of nuclear spin-isospin excitations,especially the Gamow-Teller resonance in a fully consstent relativistic random-phase approximation.A relativistic form of the Landau-Migdal parameter g‘ is adopted as a residual spin-isospin correlation force.In the non-relativistic limit it reproduces the excitation energy of the giant Gamow-Teller resonance state obtained in the non-relativistic model.The Gamow-Teller resonance for finite nuclei is investigated in a relativistic approach for the first time.It is found that the Ikeda sum rule of 90Zr is quenched about 8% in the Hartree as well as the correlated strengths due to the poles of the negative Dirac states at energies above 1 GeV.     

弹丸和超声束流注入对边缘电场和等离子体旋转的影响

在欧姆放电，超声束流入和多发弹丸注入期间，利用马赫／朗缪尔探针组测量了ＨＬ－１Ｍ装置刮层和边界层的边缘电场和等离子体旋转；环向马赫数Ｍａ、极向流速度ｖｐｏｌ和电场Ｅｒ的径向分布是分别在超声束注入和多发弹丸注入期间进行测量的。     

Experimental study on the activation process of GaAs spin—polarized electron source

GaAs spin-polarized electron source is a new kind of electron source, where the GaAs semiconductor crystal is used as a photocathode under the irradiation of helicity light. In this paper the activation process of the GaAs spin-polarized electron source is unvestigated experimentally in detail, during which the negative electron affinity of the photo cathode should be achieved more carefully by absorbing the caesium and oxygen on the surface of the GaAs crystal under ultrahigh vacuum conditions. Besides the different activation processes, the important physical parameters are studied to achieve the optimum activation results. At the same time the stability and lifetime of the polarized electron beam are explored for future experiments. Some important experimental data have been acquired.     

利用旋转液体特性测量液体折射率

在XY-1型旋转液体实验仪的圆柱形容器底部加装了圆形平面镜,利用旋转液体的几何特性和折射定律,即可测量液体的折射率.     

Rotational Deformation of Neutron Stars

The rotational deformations of two kinds of neutron stars are calculated by using Hartle‘s slow-rotation formulism. The results show that only the faster rotating neutron star gives an obvious deformation. For the slow rotating neutron star with a period larger than hundreds of millisecond, the rotating deformation is very weak.     

Unified Understanding of Giant Magnetoresistance Effect and Magnetization in Granular Films with Two-Particle Size Distribution

The giant magnetoresistance (GMR) effect and magnetization curves of Cu80 Co20 granular thin films are studied and measured in a superparamagnetism temperature (180K). The correlation between the GMR effect and the magnetization is analysed in a unified framework. These two independent properties are fitted by assuming that there are two size distributions in the Co nano-particle population. Under an assumption, good fittings are achieved for both the GMR and the magnetization, using the minimal number of parameters. The obtained average particle sizes for the smaller and larger particles are 1.0hm and 2.8nm, respectively. In fitting the magneto-transport, a power scaling relationship with the particle size for each size population is proposed, and the fitted results reveal that a certain degree of magnetic bulk scattering is present in larger particles.     

用振动旋转矢量和波动旋转矢量描述驻波波形

提出一种利用振动旋转矢量和波动旋转矢量来描绘驻波波形的方法,其特点是简单而直观．     

Effect of the Quadrupole Moment of a Rotating Massive Object on the Gravitational Faraday Rotation

We study the rotation of the polarization plane for a ray of electromagnetic radiation propagating in the gravitoelectromagnetic field caused by a rotating massive object with the quadrupole moment.The effect of the quadrupole moment on the gravitational Faraday rotation is investigated.It is found that the gravitational Faraday effect of the quadrupole moment is negligible for Kerr black holes,but this effect is important for rapidly rotating neutron stars.     

旋转进口畸变与轴流压气机旋转失速相关联的模型与实验探索

本文自行设计了轴流压气机旋转进口畸变发生装置.基于M-G模型,建立了轴流压气机旋转畸变模型.采用数值模拟和实验测量相结合的方法研究了轴流压气机在发生旋转进口畸变情况下的失速过程.试图通过分析畸变扰动与旋转失速之间关联性来探索压气机失稳的触发机理.研究结果表明:在旋转畸变条件下,压气机旋转失速总是始发于畸变扰动位置.     

Three-body Effect on Equation of State of Spin-polarized Nuclear Matter

The equation of state (EOS) of spin-polarized nuclear matter has been investigated within the spin-dependent; Brueckner-Hartree-Fock framework by adopting the realistic nucleon-nucleon interaction supplemented with a microscopic three-body force. The three-body force effects have been studied and stressed with a special attention. The calculated results are given in Fig.1. It is seen that; in the Brueckner-Hartree-Fock framework the predicted energy per particle of spin-polarized nuclear matter versus the neutron and proton spin-polarization parameters fulfills a quadratic law in the whole range of spin-polarization. The related physical quantities such as spin the Landau parameters Go in spin channel and G′0 in spin-isospin channel, have been also calculated.     

亚洲的暴风雨与地球的旋转

地球自身的旋转轴经受着多种旋转力的作用，例如二分点（即旋转轴处于春分、秋分点时）的进动等．最近发现有两个重要的旋转运动不被人注意地相互间抵消了．比利时的地球物理学家S．Lambert博士精确地测量到了这类在常规下是很难探测到的微弱晃动．这两个晃动分别是现在还不太明白其起因的钱德勒章动（Chandler wobble），这个章动的周期是433天．另一个是起源于地球上气候变化引起的晃动．这两个运动的综合后果应该导致地轴发生大于10米的移动．但由于这两个晃动的相互抵消作用，从2005年12月到2006年2月这段时间，地轴的移动却降低到了1米以下．     

旋转弹簧的长度

建立了套在光滑旋转金属杆上圆柱形弹簧模型.运用微元分析法,得到了弹簧形变量的微分方程,并求得了表达式.实验验证了弹簧总长度与旋转角速度的关系式.     

新型旋转液体实验——介绍一个研究性物理实验

介绍一种新型旋转液体实验，可以观察离心力现象，测量重力加速度，研究由旋转液体表面所形成的光学系统中焦距与角速度ω的关系，并观察该系统成像与转速的关系。     

基于单次旋转的旋转非对称面形误差绝对检测技术研究

绝对检测技术是剔除干涉仪系统误差进而提高面形检测精度的有效手段。基于单次旋转的绝对检测技术由被测球面绕光轴旋转前后的检测数据,采用基于最小二乘法的Zernike多项式拟合,剔除系统误差,获得被测面的旋转非对称面形误差。详细推导了理论计算公式,分析了单次旋转角度对算法检测精度的影响,并和多次旋转法作了对比,其残差均方根(RMS)值约为1.5nm。该方法只需一次旋转两次检测,在保证检测精度的同时简化了检测过程。     

半凸旋转棱镜对光束变换

本文对半凸旋转棱镜对光束变换进行了详细的理论分析，定量计算了变换光束的空间强度分布。结果表明经半凸旋转棱镜变换产生的光束具有“无衍射”性质