A Multi-component Matrix Loop Algebra and Its Application

A set of multi-component matrix Lie algebra is constructed. It follows that a type of new loop algebra A^- M-1 is presented. An isospectral problem is established. Integrable multi-component hierarchy is obtained by Tu pattern, which possesses tri-Hamiltonian structures. Furthermore, it can be reduced to the well-known AKNS hierarchy and BPT hierarchy. Therefore, the major result of this paper can be regarded as a unified expression integrable model of the AKNS hierarchy and the BPT hierarchy.     

Indriect Determination of CTMAB with Sodium Chloride and Ammonium Thiocyanate by Floatation and Separation of Zine

A new method for indirect determination of cetyl-trimethyl ammonium bromide (CTMAB) with NaCl and NH4SCH by floatation and separation of zinc has been studied.The study shows that Zn(Ⅱ） can associate with NH4SCN and CTMAB to form insoluble ternary ion-association complex,and the precipitate can float on the surface of the liquid phase.A good linear relationship is observed between the floatation yield(E%) of Zn(Ⅱ） and the amount of CTMAB.On the ground,CTMAB Can be indirectly determined by determining E% of Zn(Ⅱ）.The results were satisfactory.     

Proton Fraction in Neutron Star Matter and Three-Body Force Effects

The three-body force effects on the equation of state and its iso-spin dependence of asymmetric nuclear matter and on the proton fraction in neutron star matter have been investigated[1] within Brueckner Hartree-Fock (BHF) approach by using a microscopic three-body force. It is shown that, even in the presence of the three-body force, the empirical parabolic law of the energy per nucleon vs. isospin asymmetry β=(N-Z)/A is fulfilled in the whole asymmetry range 0 ≤β ≤1 and also up to high density. The three-body force provides a strong enhancement of symmetry energy at high density in agreement with relativistic approaches. Thecalculated proton fraction in β stable neutron star matter is given in Fig.l, where the thick solid line is the BHF prediction using AV18 TBF, while the dotted one is the BHF result using AVis. The thin solid line is the prediction of the Dirac-Brueckner approach taken from Ref.[2]. The results extracted according to the phenomenological paramete rizations of the symmetry energy suggested in Ref.[3] are also plotted. It is seen from     

浅谈中外高等教育评价的特点和主要差异

1欧洲高等教育评价的特点 从20世纪80年代起,欧洲各国普遍开始重视高等教育的质量问题.在高等教育评价活动的过程中,逐渐形成了著名的三种模式:法国模式、荷兰模式和英国模式,对其它国家产生了很大的影响.这三种模式概括起来有以下特点:     

磁通涡旋线的临界磁场

将计算所得的涡旋磁通自由能F^[1]进行求导，得到a，b，x之间的关系式．由此，只要知道电荷数、粒子质量，利用图解法即可求出α，β的值．再利用1／h=λ(λ是穿透深度)，将λ进行代换，最终得出λ与h，ξ与η，x与κ间的关系．对于单位磁通线BV=BS=Φ=φ0则可计算出高κ近似下的第一临界磁场Hc1，并进一步求出hc1．     

三包层WⅠ和WⅡ型单模光纤波导色散特性的研究

研究了三包层WⅠ和WⅡ型单模光纤的波导色散特性。结果发现在相同条件下，三包层WⅠ和WⅡ型单模光纤零色散点的调节范围比传统的双包层W型单模光纤明显增大。详细分析了几何参量P、Q和光学参量R1、R2对单模传输时的波导色散特性和低次模截止频率的影响。所得的研究结果为获得更为理想的色散补偿、色散平坦光纤及设计新型无源光器件提供了重要的依据。计算波导色散的方法可推广到多包层光纤。     

二阶时滞微分方程三点边值问题的多重正解

 研究了一个二阶时滞微分方程的三点边值问题,给出了其至少有2个正解的充分条件.     

烷烃类分子对NC0（A^2∑^＋）自由基的猝灭

采用激光光解—激光诱导荧光(LP—LIF)的方法，用266nm激光光解CHBr3分子产生CH自由基，再与N2O继续反应作为NCO自由基的产生源，用438．6nm激光将电子基态X^2∏i(00^10)的NCO激励到激发态A^2∑^+(00^00)上，通过检测激发态NCO时间分辨荧光信号，测得室温(298K)下NCO(A^2∑^+)被烷烃类分子猝灭的实验结果，获得了A^2∑^+(00^00)态猝灭速率常数．实验发现，随着烷烃分子中C—H键数增加，其猝灭截面也近线性增加，但随着分子体积增大，这种增加趋缓．     

ESTIMATE OF THE UPPER CRITICAL FIELD AND CONCENTRATION FOR SUPERCONDUCTOR

The effect of an applied magnetic field on an inhomogeneous superconductor is studied and the value of the upper critical magnetic field Hc3 at which superconductivity can nucleate is estimated. In addition, the authors locate the concentration of the order parameter, which depends on the inhomogeneous term a(x). Unlikely to the homogeneous case, the order parameter may concentrate in the interior of the superconducting material, due to the influence of the inhomogeneous term a(x).     

Critical Behaviour of the One—Dimensional Ferromagnetic t—J Model

The one-dimensional super-symmetric ferromagnetic t-J model is studied via the thermal Bethe ansatz.Analytic expressions of the free energy for T→O are obtained.A new critical behaviour beyond the universal class of Luttinger Liquids is found in this system.