材料期刊网

HIRFL-CSR实验环电子冷却装置调试

卢旺 , 杨晓东 , 李杰 , 冒立军 , 王志学 , 赵红卫 , 燕宏斌 , 张玮 , 张军辉 , V.V.Parkhomchuk , BINP Electron Cooler Group

原子核物理评论 doi:10.3969/j.issn.1007-4627.2005.02.005

HIRFL-CSR实验环电子冷却装置采用了能够产生空心电子束的电子枪, 弯曲螺线管内采用了静电偏转电极, 冷却段采用了独立的高精度螺线管串联产生纵向磁场的设计. 测量了沿离子束运动方向冷却段磁场分布及磁场平行度、电子枪和收集器性能、 300 kV高压电源相关参数. 结果表明, 此装置达到了预期的设计目标.

关键词: 空心电子束 , 磁场平行度 , 高压发生器

MATERIALS FOR RETENTION OF LIQUID CRYOGENS CONTAINED IN SPACE QUALIFIED COOLER

YX. Qi , J.K Xeand B.P. Huang (Shanghai Institute of Technical Physics , Chinese Academy of Sciences , Shanghai 200083 , China)

金属学报(英文版)

A new kind of material used in liquid cryogen cooler has been found and investigated in our group It is anticipated that the materials can be applied in the conditions of launching, rotation in any orientation and weightlessness. The mechanism on which the material relies is similar to "sponge" trapping the liquid cryogens within its micro-pores with surface tension. Preliminary tests have been performed on wicking. Also,we apply the materials to the cryogenic optical cooler whjch needs to be maintained within the temperuture range of 80-100 K. The results are satisfactory.

关键词: liquid cryogen cooler surface tension , null

Failure analysis of the brass tubes in a lubricating oil cooler

Engineering Failure Analysis

Failure analysis was carried out on leaked brass tubes of a lubricating oil cooler. Direct evidences of dezincification and stress corrosion cracking (SCC) were observed by scanning electron microscope (SEM) and energy dispersive spectroscopic (EDS) analysis. It is found that there are many small pits distributed on the fracture surface and EDS analysis revealed the occurrence of dezincification in the small pits. SCC was observed on the cross-sectional plane of the fracture by SEM. Ammonia test has proved the existence of residual stress in the as-received tubes. It is determined that the brass tubes have been suffered from the coaction between dezincification and SCC. (C) 2011 Elsevier Ltd. All rights reserved.

关键词: Lubricating oil cooler;Brass tubes;Pit;Dezincification;Stress;corrosion cracking (SCC)

DETERMINATION OF SPACE GROUP OF PrCo_(12)B_6 COMPOUND BY CONVERGENT BEAM ELECTRON DIFFRACTION

WANG Fuhui Institute of Corrosion and Protection of Metals , Academia Sinica , Shenyang , ChinaBIAN Weimin Northeast University of Technology , Shenyang , China Institute of Corrosion and Protection of Metals , Academia Sinica , Shenyang , China

金属学报(英文版)

The space group of PrCo_(12)B_6,compound has been determined using the convergent beam elec- tron diffraction method.The space group is found to be R3m.

关键词: convergent beam electron diffraction , null , null

Side-effects of the space charge field introduced by a hollow electron beam in the electron cooler of CSRm

TANG Mei-Tang , YANG Xiao-Dong , MAO Li-Jun , LI Jie , MA Xiao-Ming , YAN Tai-Lai , ZHENG Wen-Heng

中国物理C doi:10.1088/1674-1137/39/12/127003

关键词:

Density matrix renormalization group studies on the stability of quasi-1-D undoped and doped polymer ferromagnets

Canadian Journal of Physics

We study the ferromagnetic ground state of the theoretical model proposed for quasi-one-dimensional organic polymer ferromagnets by using the density matrix renormalization group method. We find that the chain-radical interaction, the on-site electron-electron repulsion, and the electron-phonon coupling play important roles in the stability of the ferromagnetic state, whether in doped systems or not. We are convinced that when the system is doped by one electron, a polaron appears, diminishing the stability of the high-spin state.

关键词: dimensional organic ferromagnet;hubbard-model

Determination of Space Group Pncm of Prehnite Using Electron Diffraction Method

武汉理工大学学报-材料科学版(英文版)

关键词:

RENORMALIZATION-GROUP OF GENERALIZED FIBONACCI LATTICES

Physical Review B

We investigate the renormalization group of the generalized Fibonacci lattices associated with the aperiodic sequences as constructed by the inflation rule: {A,B} --> {A(n)B(m),A}, in which m and n are positive integers. The derived renormalization group consists of 2n(n+m-1)+1 basic renormalization-group transformations. By suitable combinations of these basic transformations, local Green's function and local density of states at any sites can be calculated for electrons on the generalized Fibonacci lattices. The off-diagonal model is employed, and the local electronic densities of states at several sites are numerically calculated for some generalized Fibonacci lattices.

关键词: one-dimensional quasicrystals;quasi-periodic systems;electronic-properties;green-functions;phonon properties;energy-spectra;wave-functions;dynamic maps;localization;tilings

Renormalisation Group of Two-dimensional Decagonal Tilings

Xiaohong YAN , Jianwen DING , Qibin YANG , Bruno Iochum

材料科学技术（英文）

We present a new series of two-dimensional decagonal tilings which are connected with each in five transformation rules. In this case, a real-space renormalization group scheme is developed to study physical properties of the decagonal systems in terms of Green's function theory.

关键词:

Spin correlation on the main chain of a quasi-one-dimensional polymer ferromagnet: a density matrix renormalization group study

Journal of Physics-Condensed Matter

The spin correlation (SC) function on the main chain of a theoretical model for organic ferromagnets is studied by using a density matrix renormalization group method with both periodic boundary conditions and open boundary conditions (OBCs). It is found that the chain-radical interaction, the on-site electronelectron repulsion, and the electron-phonon coupling affect the SC greatly and play important roles in the stability of the ferromagnetic state. There exist some types of 'weak' OBC, diminishing the alternation of the SC.

关键词: organic ferromagnet;hubbard-model