Effects of Inhomogeneous Spin Coupling and Anisotropy on Thermal Entanglement

We study the thermal entanglement properties of a simple system that includes three spins inhomogeneously coupled between them with additional anisotropy in their couplings. The main result is the systematic analysis of the concurrence evolution as functions of inhomogeneity, anisotropy and temperature. By adjusting proportional factor of the interaction J and anisotropy parameter △, the comparison between concurrences C₁₂ andC₁₃ is also presented.     

Theoretical Investigation of Femtosecond-Resolved Photoelectron Spectrum of Na2 Molecules

Effect of laser fields on Na2 interaction potentials is studied by calculating the time-resolved photoelectron spectrum （TRPES） with the time-dependent wave-packet method. It is shown that the photoelectron spectrum at different delay times reflects the population in different electronic states. We inspect the periodicity of vibrational motion in neutral states, and map the vibrational wave-packet propagation in corresponding internuclear coordinate.     

ns激光辐照ZrO2薄膜剥落的理论研究

在ns激光辐照光学薄膜温度分布的基础上，利用最大剪应力理论建立了光学薄膜发生迎光剥落的理论模型，得到了发生损伤相应的应力分布和膜层剥落半径与入射激光能量关系．通过数值分析，验证了理论模型与实验结果基本保持一致，膜层临界损伤阈值与实验结论在数量级上保持一致；剥落半径与入射能量关系曲线与实验结果基本吻合．指出薄膜的损伤形态与其附着力强度有着密切关系，只有当附着力强度小于某一定值（～9．4×10^4N／cm^2）时，才会发生剥落．     

微腔中两原子缀饰态的二光子衰变

研究了微腔中原子衰变问题。考虑微腔中存在两个原子，两原子与腔场强耦合形成的缀饰原子与腔壁相互作用在特定初始条件下的衰变问题，指出在腔场中该衰变方式下，腔场光子数越多、衰变则越强     

铜、钛复合添加对结NdFeB磁体显微组织和磁性能的影响

研究了烧结NdFeB磁体晶间合添加Cu和Ti 对磁体显微组织和磁性能的影响，当钛含量小于1.2%时，Cu和Ti晶间复合添加可大幅度提高烧结NdFeB磁体的矫顽力，磁变化不大，矫顽力的提高归因于Cu和Ti在主相晶粒表面富集，细化晶粒，阻断主相晶粒之间的磁交换作用，阻碍反磁化畴的传播，当钛含量大于1.2%时，矫顽力略有下降，乘磁急剧下降，乘磁下降的原因在于出现了大量的条状纯钛相。与晶间单独合金化相比，晶间复合合金化可更有效改善NdFeB磁体显微组织与性能。     

竞赛中的方程

方程是初等代数学的主要内容，也是数学竞赛的命题热点．方程与函数常常联系在一起，求函数的零点其实就是解方程．在求解方程问题时，常常要用到如下结论．