关于分子分布律的教学

从教学角度来探讨既能使学生掌握统计概念又不至于使用太多的数学推导,由玻耳兹曼分布率导出麦克斯韦速率分布律。     

变系数波动方程的边界镇定

应用Riemann几何方法和乘子方法,得到一定条件下变系数波动方程在线性边界反馈下能量的指数衰减性.     

The reliability of measurements on electron energy distribution function in silane rf glow discharges

Electron energy distribution function (EEDF) is a key parameter of plasmas, which is directly proportional to the second derivative of the probe I-V characteristics. Because of an amplifying effect of unavoidable noises in the experimental probe I-V curves during the derivation process, the experimental I-V curves should be smoothed before performing the numerical derivation. This paper investigates the effect of adjustable factors used in the smoothing process on the deduced second derivative of the I-V curves, and an optimum group of the adjustable factors is selected to make the rms deviation of the smoothed I-V curves from the measured curves less than 1%. A simple differentiation circuit is designed and used to measure the EEDF parameter straightforwardly. It is the first time, so far as we know, to measure the EEDF parameters simultaneously by means of both numerical and circuit derivative methods under the same discharge conditions and on the same discharge equipment. The deviation between two groups of mean electron energy E and electron density n_e obtained by the above different methods is within about 7%. This apparently improves the reliability of the measurements of the EEDF parameters.     

Single mode rate equations for two sections self—pulsating DFB laser

We Propose a set of single mode rate equations for multi-section distributed feedback(DFB) lasers. On the basis of the rate equations, the self-pulsation in the two-section DFB lasers with asymmetrical injection current was explained. It was found that the dynamic distribution of the power in two sections play key role in the self-pulsation running.     

Random matrices applied to superconductivity in nano-particles

In this paper we introduce an approach in which the random matrices are applied to superconducting nano-particles, and obtain the effects of enhancement and attenuation simultaneously. We also explore the influence of magnetic fields on the superconductivity and the condensation energies in nano-particles. Comparisons with other models and some experimental results are given.     

Near threshold photodetachment cross section of negative atomic oxygen ions

A 40-target state close-coupling calculation for the photodetachment cross section of negative atomic oxygen near threshold is carried out with core－valence electron correlation by using the R-matrix method. It was shown that after considering the excitations of two electrons from the 2s shell, the electron affinity of O^- (2s^22p^5{}^2P°) agrees with the experimental result much better than that just considering the excitations of electrons only from the 2p shell as well as only one electron from the 2s shell. Total cross section as well as the main contribution of the ionization channels to the partial cross section are illustrated to show the structure near threshold clearly.     

碰撞能量对反应Sr＋HF转动取向的影响

在推广LEPS势能面上,用经典轨线方法,研究了反应碰撞能量对反应Sr＋HF的转动取向的影响.计算结果与产物轨道角动量模型进行比较.计算结果表明,随着碰撞能量的增加,产物转动取向越强烈.     

磷光电致发光器件研究中的若干问题

本文从光物理和光化学的角度出发对磷光电致发光器件中的一些基本过程和问题,如发光层材料的选择和激发,主体化合物分子间的能量迁移,主客体分子间的能量转移以及磷光的发射等进行了扼要的讨论,并指出了在设计和制备这类新型的发光器件中应注意的一些问题.     

活化能与温度关系图的计算机辅助释疑

作者使用计算机绘制了气体分子能量分布曲线图 ,较全面的阐明了活化能与温度的关系。是对无机化学中活化能与温度关系图的改进与补充。     

黏弹性结构振动阻尼等效化方法的讨论

基于能量等效的原则将黏弹性结构振动阻尼等效简化成黏性阻尼模型来处理是工程上常用的方法.本文首先介绍了能量等效法,并提出了一种基于系统特征值相等原则的等效方法;详细讨论并比较了这两种黏性阻尼等效方法所得到的等效系统,指出基于能量、特征值等效的原则实质上分别等价于系统的频率响应函数、频率响应函数幅值的等效性.