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Investigation of Defects Induced by Helium and Hydrogen Implantation in CLAM Steel by a Slow Positron Beam

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Investigation of Defects Induced by Helium and Hydrogen Impl...

9th International Conference on Computer Simulation of Radiation Effects in Solids

作者： J.Qiu~1 Y.Xin~1 X.Ju~(1*) L.P.Guo~2.B.Y.Wang~3.Y.R.Zhong~3.Q.Y.Huang~4 Y.C.Wu~4 1 department of physics {2. of science and Technology beijing beijing 100083.china 2.Accelerator Laboratory School of physics Wuhan {2. Wuhan Hubei 43.072.china 3.Key Laboratory of {13. Analysis Techniques institute of High Energy physics Chinese Academy of sciences beijing 100049 china 4 institute of Plasma physics Chinese Academy of sciences Hefei Anhui 2.003. china

＜正＞The Reduced Activation Ferritic/Martensitic（RAFM） steel is considered as the primary candidate of structural material for both the ITER and the first fusion plant, and widely studied in the *** china {2. Activ... 详细信息

关键词： CLAM Steel Ion Implantation Slow Positron Beam

CoxCu1-x复相纳米线阵列的制备及其磁性的研究

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物理学报 2008年第7期57卷 4527-4533页

作者：刘晓旭陈贵锋李养贤徐世峰吴光恒徐秋王鸿雁刘宝海师宏伟王冀霞赵郁海河北科技师范学院数理系秦皇岛066004 河北工业大学材料学院天津300130 中国科学院物理研究所北京凝聚态物理国家实验室北京100190

利用电化学沉积方法在同一种富Co2.溶液Co2./Cu2.=10∶1中,利用不同的沉积电位成功地制备了一系列不同成分(x=0.3.—0.87)和复合相结构的CoxCu1-x纳米线阵列.发现随着纳米线中Cu含量的变化,CoxCu1-x纳米线的复相结构随之发生规律的变化... 详细信息

利用电化学沉积方法在同一种富Co2.溶液Co2./Cu2.=10∶1中,利用不同的沉积电位成功地制备了一系列不同成分(x=0.3.—0.87)和复合相结构的CoxCu1-x纳米线阵列.发现随着纳米线中Cu含量的变化,CoxCu1-x纳米线的复相结构随之发生规律的变化,最终导致纳米线的磁性也随之规律的变化.随着纳米线中Cu含量的不断增加,一部分Cu与Co形成面心立方结构(fcc)的CoCu固溶体,减弱了磁晶各向异性与形状各向异性的竞争,从而提高样品的方形度;一部分Cu以fcc结构的Cu单质的形式存在于纳米线中,并随着Cu颗粒大小的不同分别起到破坏磁晶各向异性和钉扎畴壁的作用,从而增加纳米线的方形度和矫顽力.对比不同成分的样品,发现CoxCu1-x纳米线的方形度和矫顽力的最大值分别出现在Co75Cu2.和Co60Cu40中,并且由于其特殊的复相结构致使它们的值要好于相同直径的单相结构的结果.

关键词：纳米线电化学沉积磁性

Penetration depth and concentration distribution for implanted heavy ions with low energies in plant seeds by SEM and EDS

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nuclear science and Techniques 2001年第1期12卷 26-31页

作者： WANG Xin-Fu ZHOU Yun-Long ZHOU Hong-Yu LU Ting Wang Chao SU Ying ZHU Guang-Hua WEN Chen-Lin LI Yong-Liang (Key Laboratory for Beam Technology and material Modification of Ministry of Education, institute of {2. Energy {3. physics, beijing Norm Key Laboratory for Beam Technology and material Modificationof Ministry of Education Institute of Low Energy Nuclear PhysicsBeijing Normal University beijing Radiation Center department of Biology Beijing Normal University Center for Analysis and Testing Beijing Normal University

The penetration depth and concentration distribution of implanted ions have been studied for low energy heavy ions implanted in the dry seeds of plant, such as peanut, mung beau, sunflower, wheat and radish seeds, etc. by SEM+EDS. The results .how that the maximum penetration depth is about 12.m for V+ with an energy 2.0 keV implanted in cotyledon of the peanut, 18pm, spin, 2.μm for V2. with 90 keV implanted in sunflower, wheat, radish seeds, respectively. The penetration depth of implanted Cu2. with 80 keV is about 90μm in the remainder funicle derivative of the mung beau seeds. The experimental result of the maximum penetration depth of implanted V+ in the peanut seeds was compared with the calculated value of the TRIM95.

关键词：离子移植渗透深度浓度分布植物种子

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非磁性材料磁电阻效应的研究进展

物理实验 2003年第3期23卷 16-19页

作者：周勋梁冰青唐云俊王荫君贵州师范大学物理与电子科学系贵州贵阳550001 中国科学院物理研究所磁学国家重点实验室北京100080

探讨了非磁性材料与磁性材料磁电阻效应的异同 ,分析了几种有代表性的非磁性材料的巨大磁电阻效应 ,概述了目前非磁材料磁电阻效应的研究和应用状况 .

关键词：非磁性材料磁电阻效应 Bi单晶薄膜

Difference of Crystallization Processes Induced from the Mechanical Milling and Annealing under normal and High Pressure in Amorphous Fe-N Alloy

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Difference of Crystallization Processes Induced from the Mec...

18th International Conference on High Pressure science and Technology

作者： Li Liu Bin Yao Shu-E Liu.Xu-Dong Zhao.Wen-Hui Su department of physics Jilin {2. Changckun 13.02. P. R. china department of material science Faculty of science National {2. of Singapore Singapore 1192.0.Center for Condensed Matter and Radiation physics china Center of Advanced science and Technology (World Lab) PO Box 873. {12. 100080 P. R. china

＜正＞ Based on crystallization thermodynamics and kinetics, crystallization products of amorphous alloys are mainly influenced by pressure, temperature and composition, and the crystallization temperature is affected by pressure and composition. However, only the effects of temperature and composition on mechanical crystallization were considered in previously reported works. In order to confirm the effect of high local pressure on crystallization of amorphous Fe-N alloy, an amorphous Fe-N alloy was prepared by ball milling of a mixture of Fe and hexagonal boron nitride. Its crystallization processes were studied in the case of mechanical milling （MM） and annealing under normal and high pressure. The 2.h-milled sample containing amorphous Fe-N was annealed for In under pressures of 2.to 4GPa and at temperatures ranging from 580K to 1170K.. XRD showed the result of the difference between MM process and thermal crystallization process. It crystallizes to e-FexN containing N content much less than its {3.er composition limit of 2.at% under normal pressure during MM and annealing under high pressure, while it transforms into γ-Fe4N during annealing under normal pressure. It was demonstrated in the present experiment that the ε-FexN with {3.er N content is a thermodynamic stable state under pressures of 3.to 4 GPa and at temperatures from 690K to 800K, though it is not under normal pressure. Therefore, the difference in crystallization product between mechanical and thermal crystallization is attributed to the effects of local pressure and local temperature on thermodynamic stable state of Fe-N alloy.

关键词： Fe-N alloy Crystallization High pressure.

A STUDY OF THE SYSTEMATICS FOR(N,T)AND(N,3.He)REACTION CROSS SECTIONS AT 14 MeV

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A STUDY OF THE SYSTEMATICS FOR(N,T)AND(N,3-He)REACTION CROSS...

第八届全国核物理会议

作者： Yao Lishan Jin Yuling department of physics,Shaanxi {2. {3. Xi’an 710062.The P,R.china Cai Dunjiu institute of Atomic Energy,P.O.Box 2.5-41 beijing 102.13.The P.R.china

The systematic characters of(n,t)and(n,3.He)reaction cross sections have been studied in incident neutron energy En=14 MeV,*** systematic trends in the cross section data have been *** analysis of the gross trend and isotope effect,odd-even effect are ***(n,t) reaction cross sections for elements with Z=2.-92.decrease as a function of increasing asymmetry parameter(N-Z)/A of the target ***,the(n,3.He)reaction cross sections show a very slight trend to decrease with increasing(N-Z)/A Possible reaction mechanisms are discussed for(n,t)and(n, 3.He)reactions. A set of the empirical parameters have been extracted on bases of an analysising and fitting the available measured ***(n,t)and(n,3.He)reaction cross sections of some nuclei have been predicted,and good agreement with measured data have been obtained.

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Research on Quartz Ceramic Crucible Wastes Applied in Jewelry Casting

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Research on Quartz Ceramic Crucible Wastes Applied in Jewelr...

2.11 IEEE International Conference on Waste Recycling,Ecology and Environment(ICWREE 2.11)

作者： Zhifan XU1 Yongheng ZHOU1* Shaoxing CHEN2.Keya SHEN2.Chang CHAN2.1 School of Photo Electronic {3. and Technology South china {2. university Guangzhou china 2.Jewelry institute of Guangzhou Panyu Polytechnic Guangzhou china

The method of production of cristobalite was based on the use of quartz ceramic crucible wastes as the basic raw material. The gypsum casting material was prepared by mixing cristobalite powder, gypsum and silica powder. Calorific properties were tested and the results showed that when the content of cristobalite was more than 50% , the gypsum casting material showed obvious cracks, which was removed into the air from resistance furnace at 600℃ after the baking process was over. The gypsum casting material showed better therma crack resistance, when 0.3.g glass fiber were added into per 100 g mixed powder, with the content of cristobalite controlled between 40%-3.%. In 3.0-600℃, about 0.4% thermal expansion occurred which effectively compensated for the cooling contraction of jewelry alloy making the casting sample meet production needs.

关键词： quartz ceramic crucible cristobalite therma expansion jewelry casting

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铀酰离子配位空间的饱和

核化学与放射化学 1987年第2期10卷 65-71页

作者：李醒夫冯锡璋郭敖凌于志辉孙鹏年中国科学院高能物理所应用部北京师范大学化学系中国科学技术大学

本文对151个铀酰配合物结构进行了配位空间堆积计算,发现无论是四角双锥、五角双锥或是六角双锥结构,在铀酰离子的赤道平面上,配位体扇面角之和都接近于180°,误差小于一个配位体。由此说明铀酰的配位饱和实际上是配位空间的饱和。根... 详细信息

本文对151个铀酰配合物结构进行了配位空间堆积计算,发现无论是四角双锥、五角双锥或是六角双锥结构,在铀酰离子的赤道平面上,配位体扇面角之和都接近于180°,误差小于一个配位体。由此说明铀酰的配位饱和实际上是配位空间的饱和。根据统计结果给出了常见配位体相对于铀酰离子的扇面角参数。这些参数可用来估计某一铀酰化合物结构的稳定性,并可推测新的协同萃取体系。还举例说明了堆积图的用法。

关键词：堆积饱和铀酰配位体空间参数

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用14MeV中子轰击铌伴生γ射线研究

高能物理与核物理 1989年第2期13卷 173-183页

作者：周宏余颜一鸣范国英兰李桥王琪孙树旭华明韩崇霑刘淑珍荣亚宁温深林汪新福杨华王皖虹唐林北京师范大学低能核物理研究所中国自然科学基金会数理部

利用脉冲化的T(d,n)~4He中子源、伴随粒子方法、Ge(Li)探测器和飞行时间技术测量了14.9MeV中子和铌反应在3.°—140°之间七个角度上的分立γ线谱;由高分辨γ谱分析程序识别了79条谱线;初步确定了62.谱线所由产生的反应类型和跃迁能级... 详细信息

利用脉冲化的T(d,n)~4He中子源、伴随粒子方法、Ge(Li)探测器和飞行时间技术测量了14.9MeV中子和铌反应在3.°—140°之间七个角度上的分立γ线谱;由高分辨γ谱分析程序识别了79条谱线;初步确定了62.谱线所由产生的反应类型和跃迁能级,其中有40条谱线是在由中子诱发的核反应中首次发现的.定出了每条谱线在七个角度上的微分产生截面,结果表明该反应中的伴生γ发射基本上是各向同性的.

关键词：中子轰击铌 γ射线