固支加筋方板在爆炸载荷作用下的刚塑性动力响应分析

采用能量法分析了固支加筋方板在爆炸载荷作用下的刚塑性动力响应。提出了该类结构在这种载荷作用下的两种变形模态和模态判别条件，导出了计及膜力影响的最大残余横向变形的计算方法及计算公式。并对两种变形模态进行了试验研究，取得了理论计算值与试验值相一致的好结果。     

Relativistic Anandan quantum phase in the Lorentz violation background

We study the influence of a classical background based on the violation of the Lorentz symmetry on the relativistic Anandan quantum phase. We show that the choice of the Lorentz symmetry violation background provides an abelian contribution for the relativistic Anandan quantum phase.     

Effects of proton irradiation on structure of NdFeB permanent magnets studied by X-ray diffraction and X-ray absorption fine structure

The effects of proton irradiation on the structure of NdFeB permanent magnet were investigated by X-ray diffraction and X-ray absorption fine structure (XAFS). The results reveal that proton irradiation has no effect on the long-range structure, but significantly affects the atomic local structure of the NdFeB magnet. The alignment degree of the magnet decreases and the internal stress of the lattice increases after proton irradiation. XAFS results show that the coordination number of Fe-Nd in the first neighboring coordination shell of the Fe atoms decreases and the disorder degree increases.     

NdFeB纳米复合永磁材料的交换耦合相互作用和有效各向异性

以Nd₂Fe₁₄B/αFe为例，采用立方体晶粒结构模型，研究了纳米复合永磁材料中不同磁性晶粒间的交换耦合相互作用和有效各向异性.纳米复合永磁材料的有效各向异性Keff等于软、硬磁性相各向异性的统计平均值，每个晶粒的各向异性由晶粒表面交换耦合部分和晶粒内部未交换耦合部分的各向异性共同确定.计算结果表明，软、硬磁性相晶粒尺寸分布显著地影响有效各向异性Keff的值.当软、硬磁性晶粒尺寸D相同时，Keff随晶粒尺寸和硬磁性相体积分数的降低而减小, 当D<20nm 时，K 关键词： 纳米复合永磁材料 交换耦合相互作用 有效各向异性 晶粒尺寸     

DETERMINATION OF PERMANENT OPTIMAL DATA POINTS AND AN EFFICIENT ALGORITHM FOR LAD PROBLEM

This paper gives a definition of permanent optimal data point of Least Absolute Deviation(LAD)problem.Some theoretical results on non-degenerate LAD problem are obtained.For computing LAD problem,an efficient,algorithm is given according to the idea of permanent optimal data point.Numerical experience shows that our algorithm is better than many of others,including the famous B R algorithm.     

PARTIAL FERRERS MATRICES

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烧结Sm2Co17型永磁材料的力学性能及断裂行为的各向异性

对从同一磁体上切取的取向方向不同的三组烧结Sm2Co17试样的抗弯强度进行测定,对其抗弯断口进行宏观观察和扫描电镜观察.对烧结Sm2Co17型永磁材料的力学性能和断裂行为的各向异性进行了研究.研究结果表明:烧结Sm2Co17型永磁材料的抗弯强度和断裂行为具有明显的各向异性,烧结Sm2Co17型永磁材料断裂的微观机制为解理断裂,材料易于沿密排面(0001)面或沿与密排面的夹角大约为60°的晶面解理断裂 关键词： Sm2Co17型永磁 抗弯强度 解理断裂 各向异性     

Determination of the Dipole Moments of Excited Complexes of Polar Compounds in Proton-Donor Solvents by the Quenching of their Fluorescence

A method of determining the permanent dipole moment of polar compounds in the excited S₁ state by the dependence of the rate of radiationless conversion of the energy of this state on the polarity of the solvent (medium) is proposed. The method was used for determining the dipole moment µ_e of hydrogen-bonded complexes formed by 4-amino-, 4-methylamino-, and 4-dimethylamino-N-methylphthalimides (4AMP, 4MAMP, and 4DMAMP) in proton-donor solvents. It has been established that µ_e = 11.68 D for 4AMP in alcohols, µ_e = 11.84 D for 4MAMP in alcohols, and µ_e = 13.19 D for 4DMAMP in alcohols and water.__________Translated from Zhurnal Prikladnoi Spektroskopii, Vol. 72, No. 2, pp. 186–191, March–April, 2005.     

共线存储实验及理论分析

以Ar^ 离子激光器共线输出多波长作为光源，以有机导电材料作样品，采用简并四波混频（DFWM）光路装置，实现了多重多波长共线读出实时和记汐存储，获得了良好的照片记录，观测并解释了存储间的竞争现象。     

基于PXI和RT-LAB的永磁同步电机快速控制原型设计

针对永磁同步电机控制器存在算法复杂、代码量大、开发周期长等问题,实现一种基于虚拟仪器的永磁同步电机快速控制原型系统。设计快速控制原型硬件平台,并对硬件设备进行选型,包括PXI虚拟仪器、功率驱动模块、电机对拖台架等;研究永磁同步电机转子磁场定向控制原理基础上,以一台3.1KW被测电机为被控对象,在RT-LAB实时仿真软件环境下,搭建永磁同步电机控制算法模型。实验结果表明,电机转速与定子电流均可无偏差跟踪参考给定值,系统控制性能良好,且该系统使电机控制器开发周期缩短、成本降低。