材料期刊网

X-ray Diffraction Line Profile Broadening of Fe_(50)Pd_(50) Alloy Ultrafine Particles

Jian CHEN , Wenduo WEI , Mingchuan YANG , Xiukui SUN , Wenxiu CHEN and Zhuangqi HU (State Key Lab. of RSA , Institute of Metal Research , Chinese Academy Sciences , Shenyang , 110015 , China)

材料科学技术（英文）

The composition distribution in Fe50Pd50 alloy ultrafine particles prepared by inert gas condensation method was investigated in details by means of X-ray diffraction technique through deconvolution of the X-ray diffraction data. The microscopic composition distribution in the alloy UFP was identified, which is caused by nonuniformity of the melt, fractional distillation during the evaporation process and statistical fluctuation during nucleation and coalescence of the alloy particles. The composition distribution affects the properties of the alloy UFP

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Synthesis and Characterization of Mixed Al+AlN Nanoparticles

Xiangcheng SUN , Mingchuan YANG , Feng YE , Xiukui SUN and Wenduo WEI(State Key Lab. for RSA , Institute of Metal Research , Chinese Academy of Sciences , Shenyang 110015 , China)Yingda YU and Dehai PING(Lab. of Atomic Imaging of Solids , Institute of Metal Resea

材料科学技术（英文）

Mixed Al+AlN nanoparticles were synthesized by an active plasma-metal reaction method. Mean particle size of the mixed Al+AlN nanoparticles is about 30-50 nm. Defects were found in some AlN particles. Moreover, the AlN ratio and its particle size in mixed Al+AIN nanoparticles obtained in different atmospheres (N2+Ar) increase with increasing N2 particle pressure, and the specific sudece areas of the mixed Al+AlN nanoparticles increase with the AlN ratio. The surface degradation of the Al+AlN exposed to air is estimated by the infrared absorption spectra

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Size Distribution of Ti-Fe Nanoparticles

Feng YE , Mingchuan YANG , Xukui SUN and Wenduo WEI(State Key Lab. for RSA , Institute of Metal Research , Chinese Academy of Sciences , Shenyang 110015 , China)

材料科学技术（英文）

Ti-Fe nanoparticles with different concentrations were synthesized by gas condensation method.It is found that the size distribution of single phase nanoparticles obeys log normal distribution,and that of multiple phase nanoparticles is quite different. If it is assumed that the size distribution of each phase in multiple phase nanoparticles obeys log normal distribution as that of single phase particles. the calculated distribution curve is agreeable to the empirical curve. The inferences from the hypothesis are also supported by experimental results

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Modification of Analytical Expression of Electron Dynamical Diffraction

Canying CAI , Qibin YANG , Hongrong LIU

材料科学技术（英文）

Assuming that the wave function , the Schrodinger equation can be written as . Neglecting the last two terms, an analytical expression of electron dynamical diffraction was derived by Qibin YANG et al. In this paper, the analytical expression is modified by further considering the second-order differential term . When the accelerating voltage is not very high, or the sample is not very thin, the reciprocal vector ɡ is large, the modification of the second-order differential is necessary; otherwise it can be neglected.

关键词: Electron dynamical diffraction , null

1998 COMPREHENSIVE TABLE OF CONTENTS

中国腐蚀与防护学报

N。1Atmospheric Corrosivlty for Steels………………………………………………… .LIANG Caideng HO[I i。-tat（6）Caustic Stress Corrosion Cr。king of Alloy 800 Part 2.The Effect of Thiosul执e……………………………………… KONG De-sheng YANG Wu ZHAO Guo-zheng HUANG De.ltL。ZHANG Yu。。he CHEN She。g-bac（13）SERS slid E16CttOCh6iniC81 Stlldy Of Illhibit1Oli M6ch＆tllsth Of ThlollY68 Oil ITOll ID H....

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连铸结晶器弯月面处保护渣的流动行为

颜慧成 , 郭征 , 张孟亭 , 张洪平

钢铁研究学报

引入变量m(冲量密度)和Yang-Mills型规范变换m=u+gradφ,将原始变量的N-S方程转化为规范-不变量形式,用自由质点法处理Voronoi元,对连铸结晶器弯月面处保护渣流动行为进行数学模拟.输出振动周期内的动态流场,然后结合一组试验数据进行计算,计算结果与实际情况相吻合,进而讨论了渣圈对液渣流动行为的影响,为研究结晶器弯月面处保护渣的行为和铸坯振痕的形成提供了一定的依据.

关键词: 连续铸钢 , 保护渣 , 流动行为 , 数学模拟

快速床动力学统一模型-由A型噎塞向C型噎塞的连续转变Ⅰ:模型构建

章明川 , 张楚 , 林郁郁 , 徐旭常

工程热物理学报

根据快速流化床的基本流动特性、A 型噎塞和 C 型噎塞的特征与定义,建立了一个统一,自恰的快速床模型一分相共存模型.模型以 A 型噎塞的修正Yang公式为‘本构方程',合理预报了快速床的最小固体流率Gsm,以及在固体流率不变的条件下降低操作气速时床层由A型噎塞向C型噎塞的连续过渡.模型中的稀相有效气流速度函数幂次n为可调参数,根据 C 型噎塞速度预报的Yousfi and Gau公式,初步确定模型参数n=4.

关键词: 快速流态化 , 噎塞速度 , A 型噎塞 , C 型噎塞 , 分相共存模型

NCl(a1 △)泵浦碘原子化学激光综述及可行性分析

多丽萍 , 李国富 , 李健 , 闵祥德

量子电子学报 doi:10.3969/j.issn.1007-5461.2001.05.001

自1990年Bower和Yang报告了NCl(a1△)/I的传能,引起了人们的极大关注.由NCl(a1△)泵浦I原子的全气相化学激光器能否产生和放大以及该体系的相关动力学的研究近几年也广泛展开.本文在综述了有关NCl(a 1△)及其与I的传能和发展现状基础上,理论上进行了分析和计算.最后对NCl(a 1△)泵浦I化学激光器可行性做了展望并提出具体探索和解决的途径.

关键词: 亚稳态NCl(a1△) , I原子化学激光

快速床动力学统一模型Ⅳ:介观解析与子模型优化

章明川 , 张楚

工程热物理学报

通过介观机理解析及子模型的优化,对已建立的快速流化床动力学统一模型进行了改进.包括:1)模型参数n和气相速度有效系数F(β)的介观模型确定方法;2)A型噎塞Yang公式摩擦系数的实验再相关;3)Harris团聚物尺寸关联式的无因次重建;4)团聚物空隙率的预报及浓相模型修正.应用所建立的统一模型对垂直并流气-固系统的C型噎塞、快速床提升管上部稀相和下部浓相的固含率、以及向高密度快速床和浓相悬浮上升流的过渡等进行了综合性的预报,并得到文献中数百个不同实验结果很好的验证.

关键词: 快速流化床 , 介观机理解析 , 管壁摩擦系数 , 团聚物尺寸 , 实验验证

三维Ising 模型的数学结构与精确解探索

张志东

金属学报 doi:10.11900/0412.1961.2016.00336

本文首先回顾Ising 模型的研究历史, 包括Ising 模型简介、二维和三维Ising 模型的研究进展, 特别是二维Ising 模型的精确解. 然后介绍作者提出的有关三维Ising 模型的2 个猜想以及推定的精确解. 从拓扑、代数和几何的角度对三维Ising模型的数学结构进行了评述. 分析三维Ising 模型的转移矩阵、拓扑理论中的纽结变换、Yang-Baxter 方程和四面体方程之间的关系, 还介绍了三维Ising 模型中存在的非局域效应、与量子场论和规范理论的关系、权重因子的物理意义、无限大温度及附近的奇异性和拓扑相变. 指出一些近似计算方法(例如, 低温展开、高温展开、重整化群和Monte Carlo 模拟等)在研究三维Ising 模型时的局限性.

关键词: Ising 模型 , 数学结构 , 精确解 , 拓扑性质 , 代数性质 , 几何性质