Numerical Solution of the Four-Anyon Problem

By making use of the Talmi-Moshinsky transformation bracket, -the Schrödinger equation for four anyons in configuration space has been solved variationally to obtain the eigenenergies and eigenfunctions. The low-lying states have been presented as functions of the statistical parameter. We illustrated how the bosonic states evolve continuously into the fermionic states.     

Calculation of the Parameters of the Dimeric Association of Water Molecules and Determination of Their Temperature Dependence

The conditions are determined, and the parameters for the onset of the mode of dimeric molecular association in the water system are estimated. The characteristics of dimeric associates of molecules are determined. The region of anomalous thermal compression water is increased from T ≤ 4°C to T ≤ 66.4°C by introducing the temperature equivalent T₀ of the energy of proton transition from molecule to molecule into the parameter of resonant interaction of atoms of different molecules. The time of transfer of excitation energy correlates with the periods of the valence and deformation vibrations of the molecules. Therefore, a molecule that performs valence vibrations “has time” to store an excitation energy sufficient to provide a parallel orientation of the spins of the nuclei of the hydrogen atoms in the molecules. Molecules that perform deformation vibrations have zero spins because of the smallness of the frequencies of such vibrations.     

Numerical Simulation Solution of the BCS Pairing Problem

We propose a new simulation computational method to solve the reduced BCS Hamiltonian based on spin analogy and submatrix diagonalization. Then we further apply this method to solve superconducting energy gap and the results are well consistent with those obtained by Bogoliubov transformation method. The exponential problem of 2N-dimensional matrix is reduced to the polynomial problem of N-dimensional matrix. It is essential to validate this method on a real quantum computer and is helpful to understanding the many-body quantum theory.     

Numerical Simulation Solution of the BCS Pairing Problem

We propose a new simulation computational method to solve the reduced BCS Hamiltonian based on spin analogy and submatrix diagonalization. Then we further apply this method to solve superconducting energy gap and the results are well consistent with those obtained by Bogoliubov transformation method. The exponential problem of 2^N-dimensional matrix is reduced to the polynomial problem of N-dimensional matrix. It is essential to validate this method on a real quantum computer and is helpful to understanding the many-body quantum theory.     

结温对GaN基白光LED光学特性的影响

制备了一个可测量n型GaN材料电阻的白光LED样品,测量了从室温到170℃下的LED芯片的n-GaN材料的电阻,发现n-GaN材料的电阻随温度的升高而增大,且两者呈一定的指数关系。利用这一特性,通过测量LED工作状态下内部所用GaN材料的电阻,可以实现对LED结温的测量。通过改变积分球底板温度使LED样品处于不同的结温下,测量了白光LED的光谱及色度学参数,结果表明:白光LED的峰值波长、显色指数、色温、光通量均与结温成一定的线性关系。     

Temperature Dependence of InSb Reflectivity in the Far Infrared: Determination of the Electron Effective Mass

We measured the dependence of the reflectivity of InSb crystals upon temperature in the submillimeter region using monochromatic radiation from an optically pumped far infrared (FIR) laser. The measures allowed us to determine the value of the electron effective mass at low temperatures with radiations of different frequencies. Our measurements extend the results obtained recently on pure crystals with magneto-optical methods to the low temperatures region where only old measures were available.     

Dependence of the Characteristics of Spectrally Narrow Luminescence Lines in Nanodiamonds on the Excitation and Temperature Parameters

Physics of the Solid State - The influence of the parameters of exciting radiation and temperature on the spectral characteristics of the narrow photoluminescence lines of nanodiamonds obtained by...     

Numerical Determination of the Relaxation Parameters of NMR in Complex Heterogeneous Systems

The methods of mathematical processing of the envelopes of spin-echo signals have been considered within the framework of the multiphase relaxation theory. A mathematical model for separation of multiexponential relaxation curves into individual exponential components of spin-spin relaxation times T _2i and amplitudes I _i is described. The multiphase nature of the relaxation of protons in complex heterogeneous systems has been revealed, and the relaxation characteristics of individual components — spin-spin relaxation times and amplitudes — have been determined.     

On One Inverse Problem of Phase Transformation in Solids

The process of diffusional phase transformation described by the two-phase Stefan-type model with the free boundary has been considered. In terms of this model, an inverse problem of boundary conditions that provide the displacement of the free boundary by a given law has been stated. The problem has been solved numerically using a computational algorithm that exploits the front rectification method and a variational approach with local regularization.     

反应堆高阶κ本征方程数值计算方法的改进

针对反应堆高阶κ-本征方程数值计算问题，提出了提高计算效率和计算精度的改进方法，并以一维问题为例，对该方法进行了验证。The solution methods for the higher order oped yet in the nuclear reactor engineering. Based on harmonics and higher order eigenvalues are not well develthe analysis of the convergence process of power iteration, a new approach for setting the starting values of higher order harmonic flux has been proposed. The results of numerical tests demonstrate that the proposed method could effectively improve the efficiency of calculations of higher order harmonics. In addition, a new type of criterion that judges the convergence of higher order harmonics dynamically has been proposed, it has been verified that the new convergence criterion could effectively prevent the buildup of numerical errors introduced in the solution of lower order harmonics in the solution of higher order harmonics.     

热物性参量对飞秒激光烧蚀金属影响的分子动力学模拟

利用结合双温模型的分子动力学模拟方法,研究了飞秒激光与金属相互作用的烧蚀机制.采用中心波长为800 nm,能量密度从0.043 J·cm~(-2)到0.40 J·cm~(-2)不等,脉宽分别为70 fs和200 fs的激光烧蚀金属镍和铝材料.靶材的温度、原子位型以及内部压力随时间的演化展示了材料热物性参量特性和激光参量对烧蚀结果的影响.结果显示材料电子热传导率对飞秒脉宽激光下的影响仍然较大;对比铝和镍的结果可知,铝的电子晶格耦合系数比镍的小,故电子晶格间的温度梯度持续时间较长;铝的电子热传导系数比镍的大,所以材料上下表面电子温度耦合的时间缩短.铝薄膜表面在能量密度为0.40 J·cm~(-2)激光烧蚀下呈现纳米尺寸的晶体结构.     

On the Temperature Dependence of Plasma Polymerization

A simple model is developed to explain the measured temperature dependence of the growth rate of polymerfilms in a C₆H₆-Ne-glow discharge. The negative Arrhenius-behaviour obtained that means a decreasing growth rate with increasing temperature — is determined by an adsorption-desorption-equilibrium of the monomer particles on the surface. From the fitting of the temperature behaviour experimentally obtained by probe measurements some characteristic parameters (activation energy, residence time) were calculated by means of the model.     

Fe∶KNbO_3光折变晶体温度效应研究

介绍Ｆｅ∶ＫＮｂＯ_３光折变晶体温度效应（２９０～３８０Ｋ）的实验研究，分别给出了在不同实验配置下的两波耦合和特殊切割晶体的自泵相位共轭的测量结果．     

石榴石型偏振调节器温度效应研究

采用磁控溅射法制备了石榴石型偏振调节器并研究了温度对其的影响.利用斯托克斯偏振仪和CCD,研究激光透过石榴石及石榴石型偏振调节器的偏振极化性质和光斑变化.实验结果表明:在25～75℃温度范围内,激光穿过不同材料时,斯托克斯参量变化趋势不同;但是因方位角不改变,激光的偏振度、线偏振度、圆偏振度基本不变.     

Solvent Dependence of H-F Coupling Parameters in Fluorobenzene

Solvent dependence of NMR spectral parameters has been the object of considerable interest in recent years (see Ref. 1 for a brief summary). More recently attention has been devoted to the solvent dependence of NMR parameters in fluorine-containing compounds. In their investigation of fluorobenzene, Mohanty and Venkateswarlu observed the effect of solvents on the proton and fluorine chemical shifts, but did not report any dependence of the H-K or H-F couplings on the solvent medium.² For 1,2-dichlorofluoroethylene Bell and Danyluk found a linear correlation between the directly bonded ¹³C-H and ¹³C-F couplings and the H-F couplings.³ These results, along with linear correlations between the ¹³C-H (or ¹³C-F) coupling and the proton (or fluorine) chemical shift, led to the inference that the medium effect acts to change the coupling parameters and shieldings by a similar mechanism.     

掺铒光纤放大器增益的温度依赖关系

报道掺铒光纤放大器增益随温度变化的依赖关系，提出了一个解释这种依赖关系的数学模型。此模型基于如下假设：由于温度的变化，引起处在基态和激发态的斯塔克能级上的掺铒离子浓度的重新分布，从而引发光纤发射截面和吸收截面的变化。理论结果与实验结果符合很好。     

The Inverse Problem of Argon Diffusion from Minerals: Determination of Kinetic Parameters from Stepwise-Heating Experiments

Abstract

Results of two routine ⁴⁰Ar/³⁹Ar stepwise heating experiments on a biotite and a basanite are interpreted in terms of Fick's and Arrhenius' laws. Both patterns represent a saddle-shaped ³⁹Ar release. Argon isotope spectra are suggested to be controlled by the activation energy of diffusion E and the frequency factor D_o . The activation energy of ³⁹Ar is lower than the one of ⁴⁰Ar. This results in a preferable release of ⁴⁰Ar relatively to ³⁹Ar at high-temperature steps and an increasing high-temperature wing in the saddle-shaped age spectrum. At low temperatures, considerable losses and irregularities in release of mainly ³⁹Ar are observed, which cause the decreasing low-temperature wing in the “saddle”. The suggestion of argon losses (mainly of ³⁹Ar) from a loose, “unstable” zone of the mineral structures becomes justified. The n-irradiation of the samples and the shift of E of ³⁹Ar towards lower values seems to explain the saddle-shaped age-spectra often encountered in ⁴⁰Ar/³⁹Ar-geochronometry.