Effect of the Coadsorption of CO and O2 on the Phase Diagram of the Ziff—Gulari—Barshad Model

The effect of the coadsorption of CO and O2 on the Ziff-Gulari-Barshad surface catalytic reaction system in studied by Monte Carlo simulation.The coadsorption of both species adds an extra reaction step to the classical Ziff-Gulari-Barshad model.It is shown that the second-order phase transition from the reactive state to the O-passivated state in the Ziff-Gulari-Barshad model is eliminated,and the production rate of CO2 increases linearly along the fraction yco of CO in gas phase when it is low,in agreement with experimental results.We also find that the increase of the probability of the coadsorption leads to the decrease of the critical value of yco of the discontinuous phase transition to the CO-passivated state.     

相对论激光在Maxwell分布等离子体中产生的高次谐波

 研究了强激光与具有初始速度分布的等离子体作用产生的高次谐波。结果表明，对于Maxwell速度分布的等离子体，由于电子初始时刻的无规则热运动，在一定程度上抹平了辐射功率在谐波谱上的分布，使得高次谐波的辐射增强，低次谐波的辐射有所减弱，有利于高次谐波的产生。     

铕三元配合物红色薄膜电致发光器件

铕三元配合物红色薄膜电致发光器件李斌马东阁张洪杰＊赵晓江倪嘉缵（中国科学院长春应用化学研究所１３００２２）自从Ｃ．Ｗ．Ｔａｎｇ［１］发表了高效、高亮度双层结构器件以来，有机薄膜电致发光（ＯＥＬ）因其驱动电压低、易于制成大屏幕且具有全色等特点，在实现彩...     

自对偶引力的局部对称性与约束

在Ashtekar形式下，广义相对论的相空间被嵌入到复SU（2）Yang-Mils理论的相空间里．将一般场论中分析局部对称性与约束的方法推广到复的场论，从自对偶Palatini形式的位形空间构造出Ashtekar形式的相空间，进而讨论了位形空间上的局部对称性与相空间上的约束的关系． 关键词：     

Photonic band structures of two-dimensional photonic crystals with deformed lattices

Using the plane-wave expansion method, we have calculated and analysed the changes of photonic band structures arising from two kinds of deformed lattices, including the stretching and shrinking of lattices. The square lattice with square air holes and the triangular lattice with circular air holes are both studied. Calculated results show that the change of lattice size in some special ranges can enlarge the band gap, which depends strongly on the filling factor of air holes in photonic crystals; and besides, the asymmetric band edges will appear with the broken symmetry of lattices.     

非完整力学系统Raitzin正则方程的形式不变性

研究非完整力学系统Raitzin正则方程的形式不变性。建立系统的Raitzin正则方程。给出在无限小变换下系统形式不变性的定义和判据。得到系统的守恒量与形式不变性之间的关系并举例说明结果的应用。     

氮、氧和氖离子的跃迁振子强度F─值的确定

本文阐述了通过实验测定Ｎ、Ｏ和Ｎｅ离子的激发能级寿命来确定跃迁振子强度Ｆ─值的方法，并给出主要理论公式和确定结果。     

多队列循环服务系统──全服务与门限服务方式的分析与建模

本文讨论全服务方式与门限服务方式的多队列循环服务系统，在平稳状态和单服务员的前提下，对服务时间为离散型的上述两类服务方式进行分析与建模，并作比较．