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Electronic structure and magnetism of R（Fe,Si）12 （R=Y,Nd）

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Science China(Physics,Mechanics & Astronomy) 2006年第2期Mechanics & Astronomy) .卷 195-202页

作者： SUN Guang’ai1, CHEN Bo1, DU Honglin2, FAN Zhijian1, GAO Tao3.& QI Xinhua3.. institute of Nuclear Physics and Chemistry, China Academy of Engineering Physics, Mianyang 621900, China 2. Department of physics, Peking university, beijing 100871, China 3. institute of {3. and Molecular Physics, Sichuan University, Chengdu 610065, China

The newly developed full-potential linearized augmented plane wave (LAPW) and local orbitals (lo) based on standard APW methods are briefly introduced, and the structure and magnetic properties of R(Fe, Si)12 compounds (R = Y, Nd) are calculated using the method. The distribution of Si at different sites is analyzed based on total energy of one crystal unit with structure having been optimized. The characters of magnetic mo-ments, total density of states (TDOS) and partial density of states (PDOS) for different crystal sites Si occupies are obtained and analyzed. The results show that the total mag-netic moments of RFe10Si2 (R = Y, Nd) are larger than those of RFe10M2 (M = Ti, V, Cr, Mn, Mo and W) and the hybridization mechanism is seen as follows. Si(8j) reduce the mag-netic moments of Fe at three sites, however, Si(8f) mainly reduce the magnetic moments of Fe(8i) and Fe(8j) atoms. The Curie temperature is markedly enhanced by the introduc-tion of Si atoms according to spin fluctuation of DOS at Fermi level.

关键词： (L)APW+lo method R(Fe Si)12(R = Y Nd) magnetic moment Density of state.

HOT DIPPING ALUMINIZED COATING AS HYDROGEN PERMEATION BARRIER

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Acta Metallurgica Sinica(English Letters) 2001年第6期14卷 435-440页

作者： Z. Y Yao, M. Chini, A. Aiello and G. Benamati (China institute of atomic energy, P.O.Box 275-51, {3. 1024l3. China) ( Department of Physics, University of Trento, 3.100 Trento, Italy) ( ENEA CR Brasimone, 4003. Camugnano, Bologna, Italy) China institute of atomic energy Department of Physics University of Trento ENEA CR Brasimone

The hydrogen permeation experiment of MANET II with hot dipping aluminized coating was performed in temperature range of 573.to 623.K, in gas phase and in liquid Pb-17Li phase. The hydrogen permeation reduction factor (PRF) evaluated in gas phase is 620 at 573.K and 260 at 623.K, and in liquid Pb-17Li phase is 24-45 at 573.K and 12-3. at 623.K. The self-healing of coating is obvious and effective above 673.K. The pressure dependence of permeation flux indicates strong surface contribution. The way of filling hydrogen by continuous flow and/or bubble can increase permeation flux. The result of SEM-EDS shows that the microcrack is on the surface of the wetted part, but not on the not wetted part. The crack is superficial and affects only thin outside layer not penetrate aluminized layer. The surface elemental analysis shows that Al/O atomic ratio changes from 2/3.of not wetted part to about 1 of wetted part. The damage of coating surface seems to be related to the interaction of outside layer with liquid Pb-17Li and thermal stress during heating sample.

关键词： Electroless plating Hydrogen Maraging steel Mechanical permeability

Excitation Function of ^(27)AI(d,pα)^(24)Na

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Chinese journal of nuclear physics 1995年第2期 160-162页

作者： Zhao Wen-rong Lu Han-lin Yu Wei-xiang Cheng Jiang-tao(China institute of atomic energy,P.O.Box 275(3.,{3. 102413.

The cross sections of 27Al（d,pα）24Na reaction have been measured as a func-tion of deuteron energy from the threshould to 22 MeV by the stacked foil *** influence of 27Al（n,α）24Na has been considered in the pres... 详细信息

关键词： 27Al(d,pα)reaction Cross section Excitation function

全国环境天然放射性水平调查外照射测量的质量保证

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辐射防护 1995年第6期15卷 428-432页

作者： Yue Qingyu(China institute of atomic energy, {3.,102413. 北京

本文总结了全国环境天然放射性水平调查外照射测量的质量保证工作。文中主要介绍了外照射测量中所用的仪表及性能，３次全国现场比对测量的结果，以及对２９个省、市、自治区和武汉、包头二市的测量结果进行的现场抽样核查的结果。

关键词：环境天然放射性调查外照射质量保证

Investigation on Systematic Trend of Shape Evolution for the Os Nuclei

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Investigation on Systematic Trend of Shape Evolution for the...

Tungsten-182 Mssbauer experiments at liquid nitrogen temperature

第十三届全国核结构研讨会暨第九次全国“核结构与量子力学”专题讨论会

作者： Li Guangsheng China institute of atomic energy,{3. 102413

The energies,in particular the lifetimes of the first excited states in even-even nuclei provide a worthful information about the quadrupole deformation of the nuclear *** the even-even Os isotopes （Z=76） with neutron numbers N≤126,the systematics of the excited energies of the first 2 states indicates that Os（N=108） has maximal *** the N=108 towards the closed shell at N=82,nuclear shape changes slightly with decreasing neutron *** from Os to Os,the quadrupole deformationβ（E） extracted from the energies of the 2 excited states remain almost constant at about 0.23. This behavior may be related to the possible X（5） structures for these *** systematicses of the excited energies for both the 2 states and with the addition of the 4 states show similar trend of shape evolution and make an appearance of a maximal deformation at Os for the even-even Os nuclei.

关键词： excited energy level lifetime shape evolution

来源： cnki会议评论

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Chinese Science Bulletin 2001年第9期46卷 732-734页

作者： HUANG Runsheng, LIU Bing, ZHANG Jinrong, LIU Cong & GAO Xuekui1. Physics Department of Nanjing University, Nanjing 210093. China 2. China institute of atomic energy, {3. 102413. China Physics Department of Nanjing University Nanjing China China institute of atomic energy Beijing China

A good 182Ta Mossbauer source and an apparatus designed specially were made. 182W transmission Mossbauer experiments were successfully carried out, both of the source and absorber at liquid nitrogen temperature. It wa... 详细信息

关键词： Mossbauer effect 182W Mossbauer effect.

逆算符方法求解非线性动力学方程及其一些应用实例

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物理学报 1993年第9期42卷 1375-1384页

作者：方锦清姚伟光中国原子能科学研究所北京102413

首先简介逆算符方法及如何实现对它的数学机械化;然后用逆算符方法研究了三个典型的非线性方程:Lorentz方程,广义Duffing方程和双耦合广义Duffing方程。用四阶龙格-库塔方法进行比较,说明逆算符方法比龙格-库塔方法具有更高的精度和更... 详细信息

首先简介逆算符方法及如何实现对它的数学机械化;然后用逆算符方法研究了三个典型的非线性方程:Lorentz方程,广义Duffing方程和双耦合广义Duffing方程。用四阶龙格-库塔方法进行比较,说明逆算符方法比龙格-库塔方法具有更高的精度和更快的收敛性。本文把逆算符方法应用于混沌行为的研究,并将此法在微机上实现了数学机械化。该法有很大的普适性,特别适用于对复杂问题的定量计算,大有应用和发展前途。

关键词：非线性方程动力学方程逆算符

Correlation of Behavior Changes and BOLD Signal in Alzheimer-like Rat Model

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Acta Biochimica et Biophysica Sinica 2004年第12期36卷 803-810页

作者： Zheng-Hui HU#, Xiao-Chuan WANG1#, Li-Yun LI3. Mai-Li LIU3. Rong LIU1, Zhiqun LING1, Qing TIAN1, Xiao-Wei TANG, Yi-Gen WU2*, and Jian-Zhi WANG1* Department of Physics and Bio-X disciplinary Laboratory, Zhejiang University, Hangzhou 3.0027,China 1 Department of Pathophysiology, Tongji Medical College, Huazhong University of Science and Technology, Wuhan 43.03., China 2institute of High energy Physics and Key Laboratory of Nuclear Analysis Techniques, Chinese Academy of Sciences, P.O. Box 918, beijing 10003., China 3.uhan institute of Physics and Mathematics, State Key Laboratory of Magnetic Resonance and atomic and Molecular Physics, Chinese Academy of Sciences, Wuhan 43.071, China Department of Physics and Bio-X disciplinary Laboratory Zhejiang UniversityHangzhou 310027China Department of Pathophysiology Tongji Medical College Huazhong University of Science and TechnologyWuhan 430030 China Wuhan institute of Physics and Mathematics State Key Laboratory of Magnetic Resonance and Atomic and Molecular Physics Chinese Academy of SciencesWuhan 430071 China institute of High energy Physics and Key Laboratory of Nuclear Analysis Techniques Chinese Academy of SciencesP.O. Box 918 Beijing 100039 China

To explore a potential means for the early diagnosis of Alzheimer disease, we studied the relationship of resting T2* signal and tau hyperphosphorylation/spatial memory deficit. The rat model with tau hyperphosphorylation and spatial memory deficit was established by bilateral hippocampi injection of isoproterenol (IP). Then, the correlative alteration between resting T2* signal and spatial memory retention was assessed with blood oxygenation level dependent (BOLD) functional magnetic resonance imaging (fMRI) study and Morris Water Maze test, and Western blot was employed to confirm tau hyperphosphorylation. The analysis showed following results. (1) Tau phosphorylation at Ser3.6/Ser404 and Ser199/Ser202 was signifi- cantly increased in IP-injected rats as detected by PHF-1 and tau-1, respectively. (2) An AD-like spatial memory retention disturbance was induced at 24 h after isoproterenol injection. (3. A sensitivity threshold of resting T2* signal intensity, which separated the IP-treated rats from vehicle control, was obtained by applying linear regression analysis, and an estimated sensitivity statistical threshold was at 3..62. These results suggest that resting T2* signal may serve as a noninvasive quantitative marker in predicting AD-like spatial memory deficits and tau hyperphosphorylation.

关键词： Alzheimer disease (AD) functional magnetic resonance imaging (fMRI) isoproterenol (IP) Morris Water Maze diagnosis

Further research on high-spin structure in ^(161)Lu

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Science China(Physics,Mechanics & Astronomy) 2008年第3期51卷 315-320页

作者： LI YanXia1,2,YU ShaoYing1,2,4,SHEN CaiWan1,5,LI XiaoWei6 & CHEN YongShou3.4 1 School of Science,Huzhou Teachers College,Huzhou 3.3.00,China 2 College of Mathematics,Physics and Information Engineering,Zhejiang Normal University,Jinhua 3.1000,China 3.China institute of atomic energy,{3. 102413.China 4 institute of Theoretical Physics,Chinese Academy of Sciences,{3. 100080,China 5 Center of Theoretical Nuclear Physics,National Laboratory of Heavy Ion Accelerator of Lanzhou,Lanzhou 73.000,China 6 Department of Physics,Chifeng University,Chifeng 024001,China School of Science Huzhou Teachers College Huzhou 313000 China College of Mathematics Physics Information Engineering Zhejiang Normal University Jinhua 321000 China China institute of atomic energy Beijing 102413 China institute of Theoretical Physics Chinese Academy of Sciences Beijing 100080 China Center of Theoretical Nuclear Physics National Laboratory of Heavy Ion Accelerator of Lanzhou Lanzhou 730000 China Department of Physics Chifeng University Chifeng 024001 China

The two-dimensional total routhian surface (TRS) calculations were performed to probe into the triaxial superdeformed characteristics of a strongly populated band X2 in 161Lu. This band was identified as a triaxial superdeformed band by using our TRS method. We also got its formation mechanics,i.e. the neutron-shell correction energy plays a crucial role,while the rotating energy and the deformation-driving effect of high j intruder orbit i13.2 also play an additional role.

关键词： TRS method triaxial superdeformation formation mechanism