材料期刊网

腐蚀数据库的设计

李长荣 , DavidB.Anderson

中国腐蚀与防护学报

数据库的设计不仅要考虑全面反映具体情况的数据内容,而且要考虑存储、查阅和使用上的方便,以利于建立咨询、应用软件。本文介绍一个以工业环境为背景的腐蚀材料数据库结构及其应用程序原型的设计方法。数据结构采用腐蚀数据中心[由美国腐蚀工程师协会(NACE)和美国国家标准和技术研究院(NIST)共同创立]的标准格式,程序提供方便的数据输入、输出、修改、增删以及检索等功能。另外,用户还可以根据不同目的,对数据库进行访问和查询。

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Exactly solved Anderson lattice model

Chinese Physics Letters

A solvable Anderson lattice model is formulated. The exact eigenstates of model Hamiltonian are constructed by using the Bethe ansatz. The Bethe ansatz equations are obtained from the periodic boundary conditions.

关键词: valence;field

Are the critical exponents for Anderson localization due to disorder well understood?

Journal of Mathematical Chemistry

Semiclassical theory has been used, with some success, to discuss Anderson localization due to disorder. Our attention is focused on the quantum-chemical network model via a Boltzmann-like equation, and Garcia-Garcia's semiclassical approach, contacted with early work of Care and March on compensated semiconductor. This work is related with the recent semiclassical treatment on the effect of disorder on the nature of electron states in the quantum-chemical network model.

关键词: Anderson localization;Semiclassical theory;Critical exponent;Disorder;Dimensionality;Scaling;metal-insulator-transition;ising lattices;systems;models;semiconductors;dimensions;conduction;electrons;solids;states

Transient transport through a quantum dot: The impurity Anderson model

Physics Letters A

The transient process through a quantum dot is studied via the impurity Anderson model. The nonequilibrium Green's function technique and the Feynman path-integral method are used. The dependence of the renormalized transition time tau/tau(0) for electrons tunneling through the dot with spin sigma is found depending on the occupation probability [n(delta)] of electrons with the opposite spin <(sigma)over bar> in the dot. We conclude that the electronic correlation effect will shorten the time required for a system to arrive at a steady-state.

关键词: resonant-tunneling systems;equilibrium

无序材料Anderson局域化研究的一些新进展

郭子政

材料导报

Anderson局域化是固体物理学的经典问题.近年来,随着研究的深入,Anderson局域化逐渐与光学、量子信息、纳米结构等领域的概念相结合,在研究领域上得到空前的扩展,并取得了许多重要的进展.简单综述了这些进展,并重点介绍了关联无序、梯度无序、并发纠缠、壳掺杂纳米线等相关概念和理论.

关键词: Anderson局域化 , 关联无序 , 梯度无序 , 并发纠缠 , 壳掺杂纳米线

超导体中涡旋运动损耗与Anderson相滑移理论

徐乐康 , 唐玉立 , 单磊 , 王峰 , 徐小农 , 金新

低温物理学报 doi:10.3969/j.issn.1000-3258.2000.02.003

本文用G-L唯象理论结合Anderson相滑移理论讨论了第Ⅱ类高温超导体中的涡旋以V运动在超流电流上产生电压的损耗原因,并将结果与M.Tinkham的Josephson相滑移理论进行了比较.

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Field-controlled magnetic order with insulator-metal transitions in a periodic Anderson-like organic polymer

Physical Chemistry Chemical Physics

The zero-and low-temperature behaviors of a quasi-one-dimensional organic polymer proposed as a symmetrical periodic Anderson-like chain model, in which the localized f orbitals hybridize with the conduction orbitals at even sites, are investigated by means of many-body Green's function theory. In the absence of magnetic field, the ground state of the system turns out to be ferrimagnetic. The temperature-induced phase diagrams have been explored, where the competition between the Hubbard repulsion U on the localized f orbital and the hybridization strength V makes an important impact on the transition temperature. In a magnetic field, it is found that a 1/3 magnetization plateau appears and two critical fields indicating the insulator-metal transitions at zero temperature emerge, which are closely related to the energy bands. Furthermore, the single-site entanglement entropy is a good indicator of quantum phase transitions. The temperature-field-induced phase diagram has also been attained, wherein the magnetization plateau state, the gapless phase and the spin polarized state are revealed. The temperature dependence of thermodynamic quantities such as the magnetization, susceptibility and specific heat are calculated to characterize the corresponding phases. It is also found that the up-spin and down-spin hole excitations are responsible for the thermodynamic properties.

关键词: renormalization-group method;quantum criticality;boundary-conditions;ground-state;ferromagnet;chains;model;dimerization;solitons;scale

基于k样本Anderson-Darling检验的混杂铺层层合板挖补修理后拉伸性能研究

刘遂 , 关志东 , 郭霞 , 薛斌 , 席国芬 , 蔡婧

航空材料学报 doi:10.3969/j.issn.1005-5053.2013.1.015

对挖补修理后的平面编织混杂铺层层合板的拉伸性能进行了试验研究,使用k-样本Anderson-Darling检验对试验结果进行分析,研究挖补斜度、不同修理方法以及初始损伤直径对修理效果的影响.试验结果表明:挖补修理可以较好地恢复层板的拉伸强度.对穿透挖补修理,挖补斜度大于1:20后,修理试件的拉伸强度可以恢复至完好板的水平；对半穿透挖补修理,挖补斜度大于1:10即可保证修理试件的拉伸强度达到完好板水平.此外,仅改变初始损伤直径不会对修理试件的拉伸性能造成明显影响.以上结果对混杂铺层层板的挖补修理设计有一定的指导意义.

关键词: 挖补修理 , 混杂铺层 , 拉伸强度 , 破坏模式 , k样本Anderson-Darling检验

铁/活性炭催化剂上费-托合成反应产物分布的非Anderson-Schulz-Flory特性

马文平 , 丁云杰 , 罗洪原 , 林培滋 , 林励吾

催化学报

在浆态反应釜中研究了铁/活性炭催化剂上费-托合成(Fischer-Tropsch synthesis,FTS)反应产物分布和链增长几率(Anderson-Schulz-Flory(ASF)链增长几率和本征链增长几率).产物分布通常在C1处和C2处偏离ASF分布,呈现C1处偏高而C2处偏低的情况.本征链增长几率的研究结果表明,以活性炭为载体的铁基费-托合成催化剂上存在烯烃的再吸附二次反应,使产物分布偏离ASF分布.铁/活性炭催化剂上同时伴随水煤气变换(water gasshift,WGS)反应.XRD检测到铁/活性炭催化剂上存在FexC和Fe3O4两种物相.

关键词: 费-托合成 , 铁 , 活性炭 , 负载型催化剂 , 烯烃 , 再吸附

Anderson-B-型多金属氧酸盐[Co(2,2'-bipy)3]H-[Al(OH)6(Mo6O18)]·5H2O的合成及晶体结构

赵俊伟 , 王敬平 , 牛景杨

应用化学 doi:10.3969/j.issn.1000-0518.2006.03.013

以AlCl3·6H2O、Na2MoO4·2H2O、CoCl2·6H2O和2,2'-联吡啶为主要原料合成了Anderson-B-型多金属氧酸盐[Co(2,2'-bipy)3]H[Al(OH)6(Mo6O18)]·5H2O,进行了红外光谱、紫外光谱、差热分析和单晶结构测定.晶体学测定结果表明,化合物属于三斜晶系,Pi空间群,晶胞参数:a=1.216 0(2),b=1.221 5(2),c=1.780 0(4)nm,α=86.83(3)°,β=88.76(3)°,γ=89.82(3)°,V=2.639 4(9)nm3,Z=2,R1=0.079 4,wR2=0.176 6.化合物结构分析表明,在晶体学上,标题化合物分子是由1个[Co(2,2'-bipy)3]2+配阳离子,1个H+离子,2个1/2[Al(OH)6(Mo6O18)]3-多阴离子和5个结晶水分子组成.多阴离子[Al(OH)6(Mo6-O18)]3-借助水分子和金属配离子通过超分子作用形成二维网状结构,网状结构之间又借助超分子作用形成三维无限伸展结构.差热分析表明,标题化合物的失重过程分为2步,多阴离子骨架破坏温度为547.5℃.

关键词: Anderson结构 , 联吡啶 , 多金属氧酸盐 , 超分子结构