共查询到20条相似文献,搜索用时 15 毫秒
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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. 相似文献
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Unified Understanding of Giant Magnetoresistance Effect and Magnetization in Granular Films with Two-Particle Size Distribution 下载免费PDF全文
Jian-QingWANG JordanPeck FinnobarrO'Grady NamKim 《中国物理快报》2004,21(11):2255-2258
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. 相似文献
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Effect of the Quadrupole Moment of a Rotating Massive Object on the Gravitational Faraday Rotation 下载免费PDF全文
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. 相似文献
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ZuoWei 《近代物理研究所和兰州重离子加速器实验室年报》2003,(1):4-4
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. 相似文献
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以二维旋转简谐振子势为例分析了在BEC中经常用到的旋转势,分析了哈密顿量的表达式,给出了波函数和能量本征值,并注意到了二维旋转简谐振子势与带电粒子在磁场中的情形具有相近的形式. 相似文献
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旋转爆震涡轮发动机正获得广泛的关注,但旋转爆震燃烧室出口存在着高频的压力波动,压力波动会降低涡轮的工作效率并减小涡轮的工作寿命.基于旋转爆震波的传播特点,开展了旋转爆震燃烧室与涡轮导向器组合结构的实验研究.燃料为H2,由位于燃烧室前端的120个小孔喷入燃烧室;氧化剂为空气,由径向环缝喷入燃烧室.在燃烧室内起爆旋转爆震波后,爆震产物直接流入导向器内.研究结果表明,随当量比的增加,燃烧室内爆震波的传播速度呈先增大后减小的趋势.在导向器出口仍存在与燃烧室内旋转爆震波同主频的振荡压力,但相对于导向器前的振荡压力,出口压力振幅减小了约64%.旋转爆震波传播速度的相对偏差先减小后增大,并且爆震波传播越稳定,其速度损失越小. 相似文献
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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. 相似文献
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在没有直流磁场和存在直流磁场两种情况下,对悬浮于高频磁场的导电球在旋转扰动情况下的稳定性进行了理论分析.悬浮感应器电流的无量纲角频率为ω-.在不存在直流稳定磁场的固态球悬浮情况下,存在一个临界无量纲角频率ω-c.当ω-<ω-c,球形悬浮试样对于旋转干扰是稳定的;当ω->ω-c,球形悬浮试样对于旋转干扰是不稳定的.在直流稳定磁场的固态球悬浮情况下,存在一个无量纲角频率下限ω-c,1和上限ω-c,2.当ω-<ω-c,1或者ω->ω-c,2,球形悬浮试样对于旋转干扰是稳定的;当ω-c,1<ω-<ω-c,2,球形
关键词:
电磁悬浮
熔炼
旋转干扰
旋转稳定性
无量纲角频率
直流磁场 相似文献
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从(1+2)维非局域非线性薛定谔方程出发, 通过坐标变换得到了旋转坐标系下的非局域非线性薛定谔方程. 假设响应函数为高斯型, 用虚时间法数值求解了旋转坐标系下的非局域非线性薛定谔方程的静态孤子解, 迭代出了不同非局域程度条件下的静态椭圆孤子数值解. 最后采用分步傅里叶算法, 以迭代的孤子解作为初始输入波形, 模拟了在不同的非局域程度条件下, (1+2)维椭圆空间光孤子的旋转传输特性. 强非局域时, 椭圆光孤子的长轴方向和短轴方向波形都是高斯型, 其他的非局域程度下, 不是高斯型. 由此表明:(1+2)维椭圆光孤子对非局域程度依赖性很强. 旋转角速度和功率均与非局域程度以及孤子的椭圆度有关. 相似文献