THE PROXIMAL RELATION,REGIONALLY PROXIMAL RELATION AND BANACH PROXIMAL RELATION FOR AMENABLE GROUP ACTIONS

In this paper,we study the proximal relation,regionally proximal relation and Banach proximal relation of a topological dynamical system for amenable group acti...     

阿秒和频相位共轭极化拍频的不对称色锁二阶相干控制

研究了级联三能级系统中孪生色锁随机光场的相位共轭阿秒和频极化拍频(ASPB)不对称新效应。从理论上分析了自关联单光子简并四波混频(DFWM)和双光子非简并四波混频(NDFWM)信号辐射场与物质间不对等效应、混合型太赫兹失谐振荡特性,及双光子非简并共振四波混频信号的延时不对称性;同时也分析了由干涉计两臂不平衡色散效应引起的阿秒和频极化拍频信号的延时不对称性,即阿秒和频极化拍频信号的最大值相对于零延时有一个小偏移,结果表明该不对称性并这不影响阿秒和频极化拍频零差探测两偶极禁戒跃迁能级分裂的总体精度。阿秒和频极化拍频作为一种消除多普勒增宽的超快调制过程,从理论上说它可以扩展到任何两偶极禁戒跃迁能级系统。     

因子分析在X射线荧光光谱重叠谱峰识别中的应用

用渐进因子分析（ＥＦＡ）方法处理合金样品的Ｘ射线荧光扫描谱数据,按照数学原理选取扫描步长,根据ＸＲＦ特性选择合适的训练集建立数学模型,可以准确判断谱峰重叠,该方法在合理取点和组分含量相当的情况下有良好的识别能力。     

中性第二配体对邻氨基苯甲酸铽络合物荧光性能的影响

第二配体对邻氨基苯甲酸铽络合物荧光性能的研究,得到一些重要的结果。     

线宽误差对菲涅耳透镜衍射效率的影响

基于标量衍射理论,首先得出存在线宽误差情况下4阶菲涅耳透镜衍射效率的解析式;并以 4阶、8阶和16阶菲涅耳透镜为例,进行计算机模拟计算并系统分析线宽误差对菲涅耳透镜衍射效率的影响。通过实验测量16阶菲涅耳透镜的线宽误差,分析其对16阶菲涅耳透镜衍射效率的影响。模拟计算结果对多阶菲涅耳透镜的制作提供重要的理论指导。     

粘弹性圆薄板的动力学行为

基于线性粘弹性力学的Boltzmann叠加原理,给出粘弹性圆薄板动力学分析的初边值问题。通过一定的简化后得到描述薄板力学行为的四维非线性非自治动力系统。综合使用非线性动力学中的数值分析方法,研究了参数对粘弹性圆薄板动力学行为的影响。同时计算了吸引子的Lyapunov维、相关维和点形维。     

A Global Linear and Local Quadratic Continuation Smoothing Method for Variational Inequalities with Box Constraints

In this paper, we propose a continuation method for box constrained variational inequality problems. The continuation method is based on the class of Gabriel-Moré smooth functions and has the following attractive features: It can start from any point; It has a simple and natural neighborhood definition; It solves only one approximate Newton equation at each iteration; It converges globally linearly and locally quadratically under nondegeneracy assumption at the solution point and other suitable assumptions. A hybrid method is also presented, which is shown to preserve the above convergence properties without the nondegeneracy assumption at the solution point. In particular, the hybrid method converges finitely for affine problems.     

LaMnO3稀土纳米材料及催化性能

As catalytic materials, nanometer rare earth perovskites LaMnO3 were p repared by NaOH Na2CO3 coprecipitation, followed by supercritical drying, vacuu m drying and air drying respectively. The effect of drying processes was studied on the catalyst performance through XRD, TEM, SEM and BET analysis. The results demonstrated that about 30 nm LaMnO3 particles could be prepared by three dryin g processes respectively. The catalyst materials LaMnO3 dried in vacuum presente d the largest specific surface area as 28.71 m2•g－1. Compared to the catalyst prepared by dipping cordierite directly in the salt solutions, nanometer LaMnO3 showed better catalytic activity. The light off temperatures for CO and HC oxid ation were both lowered by 100 ℃, and its NOx conversion could be up to 100 ％ at 570 ℃.     

预混燃气高压不稳定燃烧实验研究

以冲压加速器为工程背景,着重研究预混燃气高压不稳定燃烧问题。采用实验方法,分析预混燃气装填压力、配比等因素对不稳定燃烧的影响;采用频谱分析方法,分析诸因素对压力振动特性的影响。实验给出的预混燃气的装填压力及配比的范围,可直接应用于冲击加速器射击实验,这对于减少冲压加速器高压异常事故具有重要的实际意义。     

慢正电子束技术的应用与发展

本文介绍了慢正电子束技术和最新发展,慢正电子束作为探针的基本特性,以及在多种学科中的应用等。