利用全息术测量平凸（凹）透镜的曲率半径

利用全息术测量平凸（凹）透镜的曲率半径高雁军（湖北民族学院恩施市４４５０００）在全息照相的实验中，我们发现可以利用全息术原理感知光波波面，从而测量了平凸（凹）透镜的曲率半径，并进行了对比实验．其结果与用牛顿环方法测量的比较，得到了较好的吻合，从理论和...     

碳掺杂BaTiO3的电子结构和磁性研究

基于密度泛函理论,从头计算了C间隙和替位氧掺杂立方结构BaTiO3的电子结构和磁学性质．结果表明C掺杂BaTiO3在自旋极化状态下的总能量比自旋非极化状态下的总能量小,说明C掺杂BaTiO3的基态具有铁磁性．从态密度和自旋电子密度分布可知,C位于BaTiO3间隙的磁性机理和过渡金属掺杂半导体产生磁性的机理类似：C替位掺杂BaTiO3体系磁性源于未配对的C2p电子．     

Quantum Nonlocality in Atom—Field Coupling System via Degenerate Raman Processes with Cavity Damping

The property of quantum nonlocality in the atom-field coupling system via degenerate Raman processes with cavity damping is investigated.It is found that if the cavity dissipation is very weak,the atom-field state can exhibit quantum nonlocality periodically.The rapidity of the loss of the quantum nonlocality depends on the amplitude of the initial coherent state and the cavity damping constant.The stronger the field is and the larger the damping constant could be ,the more rapidly the nonlocality decreases.