Classical trajectory Monte Carlo investigation for Lorentz ionization of H （1s）

Lorentz ionization of H(1s) is investigated by classical trajectory Monte Carlo (CTMC) simulation. The effect of the transverse magnetic field on the considered process is analyzed in terms of the time evolution of interactions in the system, total electron energy, and electron trajectories. A classical mechanism for the ionization is found, where the variation of the kinetic energy of the nuclei is found to be important in the process. Compared with the results of tunneling ionization, the classical mechanism becomes more and more important with the increase of the velocity of the H-atom or the strength of the magnetic field.     

铁电分子场与Onsager关系

在考虑体系内部相互作用非均匀性的基础上,从不可逆过程热力学的角度,在铁电领域重新引入“分子场”的概念,并给出了“分子场”所满足的热力学方程及物性方程.对铁电相变中的局域性质作了深入探讨 关键词： 分子场 局域性 铁电相变     

Subharmonic solutions for nonautonomous sublinear second order Hamiltonian systems

Some existence theorems are obtained for subharmonic solutions of nonautonomous second order Hamiltonian systems by the minimax methods in critical point theory.     

A note on periodic solutions of nonautonomous second-order systems

A multiplicity theorem is obtained for periodic solutions of nonautonomous second-order systems with partially periodic potentials by the minimax methods.

     

Periodic solutions for nonautonomous second order systems with sublinear nonlinearity

The existence and multiplicity of periodic solutions are obtained for nonautonomous second order systems with sublinear nonlinearity by using the least action principle and the minimax methods.

     

Existence and multiplicity of solutions for semilinear elliptic equations with Hardy terms and Hardy–Sobolev critical exponents

Some existence and multiplicity results are obtained for solutions of semilinear elliptic equations with Hardy terms, Hardy–Sobolev critical exponents and superlinear nonlinearity by the variational methods and some analysis techniques.     

First-Principles Calculations of Elastic Properties of Cubic Ni2MnGa

Dependence of bulk modulus on both pressure and temperature, the elastic constants Cij and the pressure and temperature dependence of normalized volume V/Vo of cubic Ni2MnGa alloy are successfully obtained using the first-principles plane-wave pseudopotential （PW-PP） method as well as the quasi-harmonic Debye model. We analyse the relationship between bulk modulus and temperature up to 800 K and obtain the relationships between bulk modulus B and pressures at different temperatures. It is found that the bulk modulus B increases monotonically with increasing pressure. Moreover, the temperature dependences of the Debye temperature are also analysed. The calculated results are in agreement with the available experimental data and the previous theoreticM results.     

铁硅酸盐分子筛乙苯氧化脱氢催化性能研究──平衡阳离子性质及水热处理对反应活性的影响

在823K和乙苯/O₂=1.0的条件下考察了乙苯在FeZSM-5上的催化活性。比较了平衡阳离子性质、水热处理及Fe₂O₃的分散程度对乙苯氧化脱氢性能的影响。结合XPS、ESR及TPR测试结果讨论了FeZSM-5中铁的存在状态与乙苯氧化脱氢的关系。结果表明,FeZSM-5催化剂上作为L酸中心的骨架Fe(Ⅲ)、水热处理产生的高分散非骨架Fe(Ⅲ)和适当强度的碱中心共同构成了乙苯氧化脱氢活性中心。     

基于团队的“导学教学法”在有机化学中的实践与思考

在医科大学有机化学教学中采用基于团队的“导学教学法”,教师精心进行教学设计,系统编写导学提纲。根据导学提纲,导引学生自主进行资料的准备、课前的讨论、完成形成性评价的记录、进行课上的讲解和习题的解答,从而达到提升学生自主学习能力的目的。