Spin-Polarized 3He–HeII Mixtures in the Static Fluctuation Approximation

We have used the so-called static fluctuation approximation (SFA) to calculate the thermodynamic properties of spin-polarized ³He–HeII mixtures at low temperature, T < 0.025 K. This approximation is based on the replacement of the square of the local-field operator with its mean value. A closed set of nonlinear integral equations is derived for spin-up and spin-down systems. This set is solved numerically by an iteration method for a realistic interhelium potential. The mean internal energy per unit volume, the pressure, the entropy per unit volume, and the specific heat per unit volume increase with increasing temperature. The mean internal energy per unit volume, the pressure increase with increasing spin polarization; while the entropy per unit volume and the specific heat per unit volume are weakly–dependent on spin polarization.     

磁流体力学湍流的一些规律

本文从处理湍流场的普遍方法──“任一物理量都可分解成平均值与涨落值之和”出发，利用量纲估计和磁流体力学湍流近似对磁流体力学基本方程进行讨论，得出有关磁流体力学湍流场的一些结论．这些结论对研究目前阶段的磁流体力学湍流理论是很有用的。     

Propagation of dust-acoustic waves in weakly ionized plasmas with dust-charge fluctuation

For an unmagnetized partially ionized dusty plasma containing electrons, singly charged positive ions, micron-sized massive negatively charged dust grains and a fraction of neutral atoms, dispersion relations for both the dust-ion-acoustic and the dustacoustic waves have been derived, incorporating dust charge fluctuation. The dispersion relations, under various conditions, have been exhaustively analysed. The explicit expressions for the growth rates have also been derived. International Conference on the Frontiers of Plasma Physics and Technology, 9–14 December 2002, Bangalore, India.     

Quantum noise property in coherent atomic system

The coherent superposition of atomic states leads to the characteristic change of interacting lights because of the coupling between the lights and atoms. In this paper, the noise spectrum of the quantified light interacting with the atoms is studied under the condition of electromagnetically induced transparency (EIT). It is shown that the noise spectrum displays a double M-shape noise profile resulted from the conversion of phase noise of probe beam. A squeezing of 0.3 dB can be observed at the detuning of probe light at the proper parameters of atoms and coupling beam.     

高温高压下CeTbO3合成过程中电阻的动态测试研究

 在0.5 GPa、4.0 GPa的压力下，从室温到800 ℃的温度范围内测量了氧化物CeTbO₃、单稀土氧化物Tb₄O₇、CeO₂和摩尔比维4∶1配比的混合物CeO₂+Tb₄O₇等的电阻随温度变化关系。对这四种物质均反映出电阻随温度增加而减小的半导体特征。在压力维0.5 GPa，温度高于600 ℃时发现了混合物CeO₂+Tb₄O₇、氧化物Tb₄O₇中电阻变化的起伏。X射线衍射谱表明，对应这一电阻变化，在结构上出现了变化。结果分析表明，这一变化与Tb⁴⁺→Tb³⁺的价态变化密切相联。     

透镜抛光机主轴转速与摆架摆速的匹配

从计算得出的浮动上模作往复周期摆动时工件表面上任一点的相对线速度表达式看出，线速度幅值是一个多变量函数，在这些参数中，只有主轴转速与摆架摆速是机床本身的固有参数，从均匀抛光角度出发，提出主轴转速与摆架摆速匹配的观点，为抛光机换代设计提供了依据。     

H模式放电中等离子体边界附近的漂移波不稳定性

本文从一简单模型出发,研究了H模式放电中边界附近的漂移波不稳定性。发现由于H模式放电中边界密度梯度很大,磁剪切的稳定作用变得不重要,漂移波不稳定性可以在边界附近发生,并可能成为宽频带密度涨落的原因。来自中性束加热的高能离子与漂移波的共振,则可能解释准相干涨落。     

A new hierarchy system on the basis of a “Master” Boltzmann equation for microscopic density

It is shown that Boltzmann's equation written in terms of microscopic density (namely the unaveraged Boltzmann function) has a wider range of validity as well as finer resolvability for fluctuations than the conventional Boltzmann equation governing Boltzmann's function. In fact the new Boltzmann equation for ideal gases has implications as a microscopically exact continuity equation like Klimontovich's equation for plasmas, and can be derived without invoking any statistical concepts, e.g., distribution functions, or molecular chaos. The Boltzmann equation in the older formalism is obtained by averaging this equation only under a restricted condition of the molecular chaos. The new Boltzmann equation is seen to contain information comparable with Liouville's equation, and serves as a master kinetic equation. A new hierarchy system is formulated in a certain parallelism to the BBGKY hierarchy. They are shown to yield an identical one-particle equation. The difference between the two hierarchy systems first appears in the two-particle equation. The difference is twofold. First, the present formalism includes thermal fluctuations that are missing in the BBGKY formalism. Second, the former allows us to formulate multi-time correlations as well, whereas the latter is restricted to simultaneous correlation. These two features are favorably utilized in deriving the Landau-Lifshitz fluctuation law in a most straightforward manner. Also, equations describing the nonequilibrium interaction between thermal and fluid-dynamical fluctuations are derived.     

Intensity fluctuations in thermal light with orthogonally polarised multiple-peak spectrum

The moment generating function of the integrated light intensity of thermal radiation having multiple peak spectrum is obtained. Cases of two-peak and three-peak spectra where different peaks are in orthogonal states of polarisation are considered. The moment generating function is shown to be the product of two simpler generating functions.     

一种基于重标极差方法的动力学结构突变检测新方法

提出了一种针对相关性时间序列动力学结构突变检测的新方法——滑动移除重标极差分析.数值试验表明,新方法能够准确的检测出理想序列中的动力学结构突变,其检测结果对于子序列的长度依赖性较小,而且具有很强的抗噪能力,弥补了滑动去趋势波动分析的不足. 关键词： 标度指数 滑动移除重标极差分析 滑动去趋势波动分析 动力学结构突变