材料期刊网

Experimental research on a THGEM-based thermal neutron detector

YANG Lei , ZHOU Jian-Rong , SUN Zhi-Jia , ZHANG Ying , HUANG Chao-Qiang , SUN Guang-Ai , WANG Yan-Feng

中国物理C doi:10.1088/1674-1137/39/5/056002

关键词:

钛等金属的SUN-Z-R复合技术

吴全兴

钛工业进展 doi:10.3969/j.issn.1009-9964.2001.02.008

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THERMODYNAMIC PROPERTIES OF ALPHA-HELIX PROTEIN - A SOLITON APPROACH - COMMENT

Physical Review E

We disagree with the deduction of the equations of motion for the Davydov soliton and of the results in the paper by Jia-Xin Xiao et al. [Phys. Rev. A 44, 8375 (1991)]. The weakness and faults of the Davydov theory are also indicated.

关键词: davydov solitons;vibron solitons;molecules;excitation;system

第27卷B辑作者索引

金属学报

Volu扣ne 27SeriesB1991AUTHOR INDEX CCAO Guanghan(曹光旱)············……6一B科6CAo weijie(曹卫恋)..················……5一B32oCAO Yilin(曹益林)··················……6一B443CHANG Xin(常听)···············……1一B48CHE Guang邻n(车广灿)·············一6一B科0CHEN Erbao(陈二保)···············……6一B410CHEN Jia....

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CFRP双剪单钉连接接头强度分析

崔海涛 , 温卫东

宇航材料工艺 doi:10.3969/j.issn.1007-2330.2004.04.011

双剪连接接头是复合材料结构连接设计的主要环节.针对T300/KH304复合材料层合板的双剪连接形式,分析了单钉连接情况下的接头强度,并采用Yamada-Sun准则预测了该层合板结构双剪连接接头的破坏载荷.结果表明:该接头的破坏模式主要呈现为挤压破坏;Yamada-Sun准则可以较好地预测该结构的破坏载荷;所预测的接头的破坏载荷及破坏模式,试验结果与数值分析结果比较一致.

关键词: 复合材料层合板 , 双剪连接接头 , 强度分析 , 有限元法

LC4铝合金稀土转化膜耐蚀性及影响因素

张巍 , 李久青 , 许江涛 , 陈昆

腐蚀学报（英文） doi:10.3969/j.issn.1002-6495.1999.06.004

开发了IC4铝合金稀土转化膜碱性两步成膜工艺ZH1,利用正交优化设计方法确定了最佳工艺参数.采用多种实验方法研究了经ZH1处理的LC4铝合金在氯化物环境中的耐蚀性及其影响因素,结果表明:经ZHI工艺处理过的LC4铝合金耐全面腐蚀和点蚀性能均有明显提高,稀土转化膜既抑制了腐蚀的阴极过程,也抑制了阳极过程.具有ZH1转化膜的LC4铝合金对氯离子浓度和pH值的变化不甚敏感.

关键词: 高强铝合金 , 稀土转化膜 , 耐蚀性学科

Extended quantum confinement luminescence center model for photoluminescence from oxidized porous silicon and nanometer-Si-particle- or nanometer-Ge-particle-embedded silicon oxide films

Materials Research Bulletin

Through analysis of the latest experimental results reported in the literature and obtained in our laboratory, we have extended our previous quantum confinement/luminescence center model for the photoluminescence mechanism of porous Si and of nanometer-silicon-particle-embedded Si oxide films (G.G. Qin and Y.Q. Jia, Solid State Commun. 86, 559 (1993)). We consider that there are three main types of competitive photoexcitation/photoemission processes and that the process in which photoexcitation occurs in the nanometer silicon particles (NSPs) while photoemission occurs in the luminescence centers (LCs) in the SiOx layers very close to the NSPs is usually the major one. We discuss under what conditions the other two types of processes will dominate. We believe that the extended quantum confinement/luminescence center model is a physical model that is suitable for the photoluminescence from silicon oxide films embedded with NSPs or nanometer Ge particles (NGPs), as well as from oxidized porous Si. (C) 1999 Elsevier Science Ltd.

关键词: oxides;luminescence;defects;blue-light emission;visible luminescence;optical-properties;nanocrystals;mechanism;dependence;sio2-films;absorption;spectra;defects

高压下合成气层流火焰传播特性的实验研究

周镇 , 艾育华 , 孔文俊

工程热物理学报

本文利用双腔泄压式定压燃烧弹,研究了高压下典型IGCC合成气的层流火焰传播特性,得到了不同压力(0.1～1 MPa)和不同当量比下(0.6～3.0)合成气的层流火焰传播速度和Markstein长度.实验结果表明,层流火焰传播速度随当量比先增加后减少,随压力的增加而减小.Davis和Sun机理能较好地预测高压下合成气层流火焰的传播速度.Markstein长度随当量比的增加而增加,随压力的增加而减小.

关键词: 合成气 , 球形火焰 , 层流火焰传播速度 , Markstein长度

层流冷却过程低碳钢相变模型的适用性分析

程杰锋 , 唐广波 , 刘正东

钢铁研究学报

选取了现有典型的C-Mn钢相变过程的物理冶金模型,包括5组孕育期模型、7组相变动力学方程模型、5组相变后铁素体晶粒尺寸模型.利用自行开发的组织性能预报系统软件模拟计算了在3组实际冷却工艺条件下各模型的奥氏体转变过程,并对各模型进行了评价.结果表明,对于所设定的成分和工艺条件,适用性较好的孕育期模型是Kwon所提出的模型;适用性较好的动力学方程模型是Liu、Donnay和Sun所提出的模型;适用性较好的铁索体晶粒尺寸模型是Hodgson所提出的模型.

关键词: 孕育期 , 相变 , 适用性分析

拉压性能不同纤维增强复合材料的非线性本构模型

朱亮 , 肖毅

复合材料学报

为满足在工程应用中对建立拉压性能不同纤维增强复合材料的非线性本构理论的需要,考虑静水压影响的Drucker-Prager屈服准则与各向异性的Hill屈服准则相结合,提出了广义Hill屈服准则,并推广到Sun-Chen的单参数塑性模型中,建立了考虑拉压异性复合材料的非线性统一本构方程.实验验证结果表明,运用本文中所建立的本构模型能够很好地描述碳纤维/环氧(IM600/Q133)复合材料在偏轴拉伸和压缩载荷作用下的非线性响应.

关键词: 单向复合材料 , 非线性响应 , 不同屈服强度 , 本构方程 , 偏轴拉伸-压缩载荷