二维Bloch电子在电场与磁场中的准经典输运行为

分别从周期场中电子准经典运动方程和作者之一最近提出的输运平衡方程出发，分析了二维Bloch电子在电场和磁场作用下的准经典输运，给出了不同电场下电子纵向漂移速度v_x和霍耳漂移速度v_y随磁场的变化趋势.结果显示，v_x和v_y均随磁场连续变化，在任何给定电场下都没有发现纵向漂移速度或霍耳漂移速度随磁感应强度发生突变.这一结论与其他作者的预言相左.分析了造成分歧的可能原因，并指出：在电子准经典运动方程中直接引入阻尼力来描述准经典 关键词：     

不均匀磁场中的静磁波传播和导波光衍射理论

理论研究了不均匀静磁场对静磁体波传播和导波光布拉格衍射特性的影响。计算表明,在场强不均匀磁场中,静磁体波的振幅有所增加,从而可以明显提高导波光的布拉各衍射效率。此外,有望通过不均匀静磁场来控制衍射光的发散。     

从运动电荷受力看磁场与电场的相对性与整体性--《费曼物理学讲义》中的一个问题的再讨论

本文通过对载流导体附近运动电荷受力的再讨论，直观地展现了电场与磁场的相对性与整体性．     

静磁场伴随有静电场存在

阐述检测物体是否产生了电场的方法；通过实际检测证实立方体永磁体既产生了负静电场，也产生了正静电场，并测定了具体的场强．     

有限长通电螺线管空间的磁场分布

本文计算了有限长通电螺线管空间的磁感应强度分布，给出了解析表达式，并绘出了它们的空间分布图。     

匀速运动的电偶极子的电场和磁场分布

本文通过对电偶极子电磁势的分析和相对论下电磁场在不同惯性系中的协变分布，计算了作匀速直线运动的电偶极子的电场和磁场的空间分布．     

IONIZATION OF THE HYDROGEN NEGATIVE ION IN A UNIFORM ELECTRIC FIELD

The ionized Lifetime of the hydrogen negativeion in a uniform electric field is again calculated by using improved perturbation theory.The choice of the H^--ion wave function and the normalization of wave function of continuous state are discussed. The numerical calculations by using Rotenberg-Stein wave function with five parameters are performed. Comparison of our results with experimental results obtained by G. M. Stinson et al. is given.     

s偏振电磁波在运动的稀薄等离子体界面上的反射与透射

对电磁波在强激光驱动的运动等离子体界面上的反射和透射进行了研究，根据电磁场在等离子体界面上所满足的边界条件以及电磁场的相对论变换理论，推导出了s偏振的电磁波在该运动等离子体界面上的反射和透射系数的表达式，并对几种特殊情况进行了讨论 关键词：     

随机磁场中的双极电场与双极扩散

等离子体中存在随机场输运时,必然会导致双极电场。本文给出了存在电场时,粒子在随机场中的转移几率,由此可计算输运流、双极电场等。算出的双极电场与碰撞的关系是不灵敏的((|e|E)/T_e=-A1/n_e(dn_e)/(dx),A与碰撞有关,但A～1)。并指出,此双极电场可作为判断随机场是否重要的必要条件(但非充分条件)。在随机场双极扩散中,杂质流速大于氢离子流速(V_I/V_i≈(m_i/     

IONIZATION OF THE HYDROGEN NEGATIVE ION MOVING IN A UNIFORM MAGNETIC FIELD

The ionization of the travelling hydrogen negative ion with high velocity in a uniform magnetic field is discussed by using perturbation theory in the first approximation. The choice of the H -ion wave function is illustrated with emphasis. And it is shown that various wave functions of the H-ion affect calculation results. The theoretical cal-culation by using Rotenberg-Stein wave function with five parameters is consistent with the experimental results ob-tained by G. M. STINSON et a1. in 1969.     

GUIDING OF PLASMA BY ELECTRIC FIELD AND MAGNETIC FIELD

The relationship between the transported ion current and the cathodic arc current is determined in a vacuum arc plasma source equipped with a curved magnetic filter. Our results suggest that the outer and inner walls of the duct interact with the plasma independently. The duct magnetic field is a critical factor of the plasma output. The duct transport efficiency is to maximize at a value of bias plate voltage in the range +10 V to +20 V, and independent (within our limit of measurement) of the magnetic field strength in the duct. The plasma flux is composed of two components: a diffusion flux in the transverse direction due to particle collisions, and a drift flux due to the ion inertia. The inner wall of the magnetic duct sees only the diffusion flux while the outer wall receives both fluxes. Thus, applying a positive potential to the outer duct wall can reflect the ions and increase the output current. Our experimental data also show that biasing both sides of the duct is more effective than biasing the outer wall alone.     

一类二维时变磁场激发涡旋电场的静电场类比计算

通过二维涡旋电场与二维静电场分布的比较，求解椭圆柱区域磁场随时间变化所激励的涡旋电场的场强转变为求解电场的势，从而使问题简化。     

广义相对论中双荷场源的电磁场张量

提出了一种求解双荷场源电磁场张量的方法.作为实例,讨论了含磁荷情况下Kerr-Newman时空中的电磁场张量,所得结果与直接进行复延拓ee+iq所得相同. 关键词：