三维流形上的变型Seiberg─Witten磁单极方程

给出了一般三维流形上变型的Seiberg–Witten磁单极方程,该方程是共形不变的,而且在欧空间上给出了一个有限能量的解析的精确解.     

高温超导体不同几何形状样品的磁通守恒和定场弛豫方程

对于实验测量中经常用到的矩形棱柱样品，我们详细推导了其磁通守恒方程和定场弛豫方程，并推广至多棱柱样品，进而给出常见的几种几何形状样品的磁通守恒方程和弛豫方程的统一表达形式，最后提供了四种最常用钉扎模型下的定场电流弛豫方程．这样就为实际测量提供了理论指导和全面参考．     

应用类比法求解介质光波导中场分布的几个实例

利用定态薛定锷方程和介质光波导中亥姆堆兹方程的相似性，分析了类比条件，给出了用类比法求解介质光波导中场分布的几个实例。     

用并矢法直接求解时谐辐射场

动用并矢代数方法，直接求解时谐电磁场的非齐闪波劝方程，并给出应用实例。     

场反向位形中等离子体的动力箍缩

本文给出了一组动力箍缩方程,它描述了场反向位形中等离子体的动力箍缩和加热。数值结果有可能为进一步开展实验提供理论依据。     

基于标架场理论的完整系统Boltzmann-Hamel方程简化方法研究

研究选取合适的准坐标简化完整系统Boltzmann-Hamel方程的问题.基于流形上的标架场理论,指出了定常构形空间中的准速度与标架场的联系,并从几何不变性的角度上导出了完整系统的Boltzmann-Hamel方程.证明了对于任意广义力为零的均匀构形空间、广义力不为零的零曲率构形空间,Boltzmann-Hamel方程均可以化简为可积分的形式,同时给出具体的简化方法并举例说明本方法的适用性.本文方法为寻找运动方程的解析解提供了一条新途径.     

双元场和光子的波动方程

把电场和磁场组合成双元场，用来表示光子的状态，使得光子的波动方程成为一阶导数型的。该方程既具备宇称变换下的协变性，也体现出电和磁间的对称性，且保持了态函数的统计诠释，文中给出了光子的一些常用算符，并分别在P和H，Pz,Jz t H以及J^2,Jz和H同时确定的情况下求出了方程的解，不需要给态函数附加Lorentz条件，即能用该波动方程得到只存在两种横光子的结论。     

压缩真空场中非简并双光子过程中系统约化密度主方程

在本文中我们利用投影算符技巧通过刘维方程推导了系统约化密度主方程。这种方法特别适合于赝非马尔可夫的库场情况。所得结果和改进的路易塞尔方法的结果一致，这种方法能正确地在各种库的情况下给出单光子过程和双光子过程的系统的主方程，我们首次求得压缩真空库场中非简并双光子过程的系统约化密度主方程。     

一类新的复合场方程及解

采用5维空间4+1分解的方法建立了标量场、电磁场和引力场的复合场方程,并给出了一个复合场方程的静态球对称解 当标量场及其与电磁场的耦合不存在时(β=0),此解退化为ReissnerNordtstrom度规.还给出了标量场和电磁场产生的复合场源流密度矢量的表示式 关键词：     

双原子分子在强红外激光场中的多光子解离理论

研究双原子分子的红外多光子解离，外场与分子的相互作用采用偶极近似，由Ｃｌｏｓｅ-Ｃｏｕｐｌｉｎｇ方法，可将体系的Ｓｃｈｒ?ｄｉｎｇｅｒ方程转化为一个矩阵方程，其中的系数矩阵具有时间周期性．因此，能够应用Ｆｌｏｑｕｅｔ理论非常有效地减少计算工作量而得到方程的解．为了给出数字结果，详细计算了ＨＦ分子的多光子解离，所用红外激光场的强度为１.２５×１０^１２Ｗ／ｃｍ^２． 关键词：     

染料激光系统增益及放大特性的数值模拟和分析

通过数值模拟计算研究了ＤＤＩ和Ｒｈ８００两种染料的激光系统工作特性。在考虑时间和空间相关性的情况下给出了对应几种实际条件下的数值解，描述了ＡＳＥ与泵浦强度的关系及其对饱和增益的影响，同时也分析了该系统的激光放大特性。     

ψ-extensions ofq-hermite andq-laguerre polynomials — properties and principal statements

Spectral theorem, reccurence relations and difference eqations for Shefferψ-polynomials are derived. These includeq-Hermite andq-Laguerre polynomials and many others — as special cases. Presented at the 10th International Colloquium on Quantum Groups: “Quantum Groups and Integrable Systems”, Prague, 21–23 June 2001.     

现代数字物理教学连载②——关于电流磁场的数字教学研究

以电磁场的教学为例,介绍了数字物理教学的重要作用,并借助现代数字技术,解决了长期以来基础物理教学未能处理好的环形电流及螺线管磁场和交变电磁场的问题,丰富了电磁学的教学内容,提高了学生处理实际问题的能力．     

A real-time approach to nonequilibrium quantum field theory of relativistic fields

Summary The basic ingredients of a real-time nonequilibrium quantumfield theoretical approach, based on a generalization of thermofield dynamics, are briefly reviewed. In particular, the possible advantages of its application to relativistic models, as the φ⁴-model for the Higgs field are pointed out. Also the differences between the above approach and others using the Feynman's path integral method are underlined. ?Angelo della Riccia? Fellow.     

Cosmological magnetic fields

Magnetic fields are observed not only in stars, but in galaxies, clusters, and even high redshift Lyman-α systems. In principle, these fields could play an important role in structure formation and also affect the anisotropies in the cosmic microwave background radiation (CMB). The study of cosmological magnetic fields aims not only to quantify these effects on large-scale structure and the CMB, but also to answer one of the outstanding puzzles of modern cosmology: when and how do magnetic fields originate? They are either primoridial, i.e. created before the onset of structure formation, or they are generated during the process of structure formation itself.     

计算机操作中人体静电放电辐射瞬态电场与磁场的研究

分析了静电放电（ESD）辐射场的偶极子模型。用高采样速率数字示波器和定做的宽带电磁与磁场探头测量了计算机操作中人体静电放电产生的瞬态电场与磁场。用FFT分析了静电放电辐射场的频谱。研究了静民放电辐射场对某电路高频信号的影响。研究结果表明,即使是很低电压（2kV）的静电放电,其辐射近场的电场达几百V/m,磁场可达几十A/m静电放电辐射场的频谱极宽,从数兆赫到数千兆赫。静电放电对高频电路的试验结果表明,若不采取有效的防护措施,人体静电放电辐射电磁场会对电路造成一定的影响,如对集成电路与元器件造成“潜在效应”的损害,对电路造成电磁干扰,甚至损坏电子器件。     

Proca fields interpretation of spin 1 equation in Robertson-Walker space-time

The general scheme for massive spin 1 equation in curved space-time is specialized to describe the Proca fields. The expressions of the Proca tensor fields are detailed in the Robertson-Walker space-time by means of the solutions of the spin 1 equation in a given tetrad and by the components of the tetrad itself. Asymptotic behaviours of the fields are discussed in the flat, closed and open space-time cases.Also GNFM, Italy     

Direct construction of a cubic selfinteraction for higher spin gauge fields

Using Noether's procedure we directly construct a complete cubic selfinteraction for the case of spin s=4$s=4$ in a flat background and discuss the cubic selfinteraction for general spin s with s derivatives in the same background. The leading term of the latter interaction together with the leading gauge transformation of first field order are presented.     

Fascinating electronic games in iron complexes

Summary Coordination compounds of transition metal ions with open-shell electron configurations may exhibit dynamic electronic-structure phenomena, depending on the nature of the coordinating ligand sphere. The change of spin state with temperature (?thermal spin-crossover?), light-induced electron transfer processes leading to long-lived metastable charge and spin states (e.g., ?LIESST? effect), are some of the fascinating electronic games encountered in transition metal compounds, which are presently under extensive study by chemists and physicists. M?ssbauer spectroscopy plays a dominant role in the investigation of such phenomena in iron compounds, as will be demonstrated in this paper. This work will focus on selected examples of ?thermal spin-crossover? in iron(II) complexes and switching between different spin states by irradiation with light of different wavelength (LIESST effect), demonstrating that M?ssbauer spectroscopy besides other physical techniques proves to be a highly elegant tool for following the spin state conversion and the concomitant changes of molecular and crystal structure properties. Finally, M?ssbauer emission spectroscopy, both time integral and time differential, has been employed to generate and identify long-lived excited spin states by making use of the nuclear disintegration of⁵⁷Co as an intrinsic molecular light source (NIESST=nuclear decay-induced excited-spin-state trapping). Lifetime measurements by optical techniques on LIESST states and by time-differential M?ssbauer coincidence spectroscopy on NIESST states prove that the relaxation pathways in the mechanisms for LIESST and NIESST are identical. Dedicated to Prof. Harry B. Gray on the occasion of his 60th birthday. Paper presented at ICAME-95, Rimini, 10–16 September 1995.