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3 0CrMnSi 2A钢飞机主梁疲劳断裂分析

马康民 , 宣建光 , 康进兴

材料工程 doi:10.3969/j.issn.1001-4381.2001.10.012

用扫描电镜观察了某型飞机机翼主梁的疲劳断口,用疲劳条带估算了裂纹扩展寿命,并用Zheng-Hirt公式估算出裂纹尖端应力强度因子范围,估算结果与实验测定值十分接近,从而为研究老龄飞机的使用寿命,进行了有益的探索.

关键词: 机翼主梁 , 30crMnSiNi2A , 疲劳裂纹扩展寿命

ION HEATING PROCESS DURING PLASMA IMMERSION ION IMPLANTATION

X.B. Tian , X.F. Wang , A.G. Liu , L.P. Wang , S. Y. Wang , B. Y. Tang and P. K. Chu 1)Advanced Welding Production & Technology National Key Laboratory , Harbin Institute of Technology , Harbin 150001 , China 2)Department of Physics & Materials Science , City University of Hong Kong , China

金属学报(英文版)

The research on plasma immersion ion implantation has been conducted for a little over ten years. Much is needed to investigate including processing technlogy, plasma sheath dynamics, interaction of plasma and surface, etc. Of the processing methods elavated temperature technique is usually used in PIII to produce a thick modified layer by means of the thermal diffusion. Meanwhile plasma ion heating is more recently developed by Ronghua Wei et al[1]. Therefore the temeperature is a critical parameter in plasma ion processing. In this paper we present the theoretical model and analysize the effect of imlantation voltage, plasma density, ion mass,etc on the temperature rise.

关键词: plasma immersion ion implantation , null , 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....

关键词:

介观LC电路在时变电源作用下量子态的演化

夏小建

量子电子学报 doi:10.3969/j.issn.1007-5461.2009.06.010

采用Wei-Norman方法,求出含时变电压源的介观LC电路随时间演化的精确解,应用相空间准概率分布函数,研究了时变电源作用下介观LC电路相干态的量子特性,结果表明此函数是一个二维运动的Gauss波包,其中心电量和磁通呈余弦和正弦变化.

关键词: 量子光学 , LC回路 , 介观电路 , 相干态 , 量子态演化 , 相空间的准概率分布函数

Monte Carlo simulation of angular distribution and fractionation in the zero-fluence isotope sputtering

Nuclear Instruments & Methods in Physics Research Section B-Beam Interactions with Materials and Atoms

A static Monte Carlo simulation program has been used to study the influence of primary and secondary knock-on atoms on the angular distribution and the fractionation, for zero-fluence sputtering of Mo-92-Mo-100. At 10 keV Xe ion energy, calculations show that significant depth-dependent momentum asymmetry exists in the near-surface region, as in Refs. (L.P. Zheng, R.S. Li, M.Y.LI, Nucl. Instr, and Meth. B 100 (1995) 490; L.P. Zheng, M.Y. Li, Nucl. Instr. and Meth. B 114(1996) 28). The calculations also show that at the polar emission angle range between 0 degrees and 90 degrees the probabilities of the sputtered primary knock-on atoms for Mo-92 and Mo-100 are small (6.1% for Mo-92 and 6.6% for Mo-100), especially, between 0 degrees and 30 degrees they are very small (2.5% for Mo-92 and 2.8% for Mo-100). At 0.1 keV Ar ion energy, the calculations show that partial momentum flux ratios, for the primary and the secondary knock-on atoms, deviate far from one, through marker plane 1 (about an atomic layer distance from the surface). (C) 1998 Elsevier Science B.V. All rights reserved.

关键词: mo-92-mo-100;targets

溶液温度和衬底对电化学沉积Cu2O薄膜形貌的影响

陈志钢 , 唐一文 , 张丽莎 , 张新 , 贾志勇 , 余颖

材料科学与工程学报 doi:10.3969/j.issn.1673-2812.2005.04.025

以透明导电玻璃(TCO)、纳米TiO2/TCO、CNTs/TCO、铜片分别为工作电极,用简单铜盐通过阴极还原制备了Gu2O薄膜,并研究了溶液温度和衬底对电化学沉积Gu2O薄膜形貌的影响.结果表明:以TCO和铜片为衬底时,由于表面微粒为微米级,不管溶液温度高低,只能得到微米级的Cu2O薄膜;以纳米TiO2/TCO和CNTs/TCO为衬底,池温高于30℃只能得到微米级的Cu2O薄膜,而池温降到0℃时,都可得到纳米Cu2O.

关键词: 氧化亚铜 , 电沉积 , 溶液温度 , 衬底

小通道扁管内纳米流体流动与传热特性

李强 , 宣益民

工程热物理学报

建立了测量小通道扁管内纳米流体流动与对流换热性能的实验系统,测量了不同粒子体积份额的水-Gu纳米流体的管内对流换热系数和摩擦阻力系数,实验结果表明,在相同雷诺教条件下,小通道扁管内纳米流体的对流换热系数大于纯液体,且随粒子的体积份额的增加而增大,而纳米流体的阻力系教并未明显增大.

关键词: 纳米流体 , 强化传热 , 小通道扁管

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