检索结果-南通市图书馆

Electronic structure and magnetic properties of metastable smCo_(7) compound

Science China(Physics,Mechanics & Astronomy) 2005年第3期48卷 325-335页

作者： ZHANG Changwen 1 , LI Hua 1 , DONG Jianmin 1 , WANG Yongjuan 1 , PAN Fengchun 1 , ZHANG Jian 1 , GUO Yongquan 2 & LI Wei 2 1. School of Physics and Microelectronics, Shandong University, Jinan 250100, China 2. Institute of Functional Materials, Central Iron and Steel Research Institute, Beijing 100081, China School of Physics and Microelectronics Shandong University Jinan China Institute of Functional Materials Central Iron and Steel Research Institutes Beijing China

The electronic density of states, spin-splittings and atomic magnetic moments of smCo 7 compound have been studied using spin-polarized MS-Xα method. The results show that a few of electrons are transferred to sm(5d 0 ) orbital because of orbital hybridization between sm and Co atoms in the compound. The exchange interactions between 3d and 5d electrons lead to the magnetic coupling between sm and Co, and therefore, result in the long-range ferromagnetic order inside the smCo 7 compound. There are negative exchange couplings occurring at some levels, which weakens the strength of average coupling around Co lattice. So, the Curie temperature and Co-moment of smCo 7 decrease distinctly compared with pure Co. Compared with smCo 5 compound, the disordered substitution of Co-Co “dumbbell-atom” pairs for sm changes the local environment of Co lattice, which makes the 2e site bear negative magnetic moment. The strength of hybridization near Fermi level weakens and the free energy of the compound increases obviously. Thus, smCo 7 is a metastable compound at room temperature. Considering the localization of 4f electrons and a few of 5d electrons arising from the orbital hybridization, the magnetic moment of sm atom will be 1.61μ B in smCo 7 compound, which is in agreement with the experimental values of sm 3+ ion- moment and sm atom-moment in metals.

关键词： electronic structure, spin polarization, atomic magnetic moment, exchange coupling, Curie temperature.

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

Electrochemical behavior of a series of azobenzene self-assembled monolayers on gold

引用

Chinese Science Bulletin 1997年第4期42卷 304-307页

作者： Wang, YQ Yu, HZ Cai, sm Liu, ZF BEIJING UNIV CTR INTELLIGENT MAT RESBEIJING 100871PEOPLES R CHINA

THE self-assembled monolayers (SAMs) emerged in the last decade as one of the most convenient and useful methods of preparing molecularly tailored interfaces with controlled spatial and geometric constraints, and have been examined widely from both fundamental and applied perspectives. Recently, SAMs of both unfunctionalized and redox-attached alkanethiols

关键词： self-assembled monolayers azobenzene electron transfer ion transfer.

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

Effect of B alloying on magnetocaloric effect of Gd5.1Si2Ge2 alloy in low magnetic field

引用

Progress in Natural Science:Materials International 2011年第5期21卷 413-417页

作者： Xue-ling HOU~(1,2),Xiang JIE~1,Jian HUANG~1,Zhi ZENG~1,Hui-min HU~1,Guan-chang ZHANG~1,Hui XU~(1,2) 1.Institute of Materials Science,Shanghai University,Shanghai 200072,China 2.Laboratory for Microstructures,Shanghai University,Shanghai 200072,China Institute of Materials Science Shanghai University Shanghai 200072 China Laboratory for Microstructures Shanghai University Shanghai 200072 China

A series of the Gd5.1Si2Ge2-xBx,alloys were prepared with arc melting in purified argon *** effect of B addition on the magnetocaloric effect of compound Gd5Si2Ge2was investigated by powder X-ray diffraction technology and DSC and direct magnetocaloric effect apparatus and vibrating sample magnetometer（Vsm）.The results show that the addition of a small amount of B maintains the Gd5Si2Ge2compound in single monoclinic phase with superior magnetocaloric effect,especially when x=0.01,the maximum magnetic entropy change（|△sm|） reaches the values of 13.7 J/（kg·K） at 288 *** 1.5 T magnetic *** the increase of B content,some orthorhombic Gd5Si4-type phases appear in the matrix of monoclinic Gd5Si2Ge2-type phase in Gd5.1Si2-xGe2Bxalloys.

关键词： B-doping Gd5.1Si2Ge2 crystal structure magnetocaloric effect adiabatic temperature change magnetic entropy change

来源：

同方期刊数据库评论

在线全文

同方期刊数据库

学校读者我要写书评

暂无评论

Solid state reaction of aromatic ketones with heteroaromatics

引用

Chinese Journal of Chemistry 1995年第6期13卷 520-524页

作者： Du, DM Meng, sm Wang, YM Meng, JB Zhou, XZ NANKAI UNIV DEPT CHEMTIANJIN 300071PEOPLES R CHINA YANBEI TEACHERS COLL DATONG 037000JILINPEOPLES R CHINA

The solid state reactions of p-nitroacetophenone, acetyl-ferrocene with indole were catalyzed by anhydrous zinc chloride or aluminum chloride, and gave exclusively the 1:2 condensation products. The solid state condensation of aromatic ketones with 1-phenyl-3-methyl-5-pyrazolone was also investigated, and the 1:1 and 2:1 condensation products were obtained. The structures of eleven new products were determined by IR, MS, H-1 NMR and elemental analysis.

关键词： solid state reaction aromatic ketone indole 1-phenyl-3-methyl-5-pyrazolone

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

A method of quantitatively calculating amount of allochthonous organic carbon in lake sediments

引用

Chinese Science Bulletin 1997年第21期42卷 1821-1823页

作者： Qian, JL Wang, sm Xue, B Chen, RS Ke, SZ Nanjing Inst Geog & Limnol Nanjing 210093 Peoples R China

TOTAL organic matter(TOM) or total organic carbon(TOC) is often treated as an importantindicator of lake environment. As a matter of fact, TOC is of multi-origin, and can simply bedivided into two parts: autochthonous and allochthonous organic carbon. The autochthonousorganic carbon is mainly controlled by the production of the plankton of lake itse1f; and the al-lochthonous one by climate and environment in the catchment area, e. g. more precipitationand runoff and densely developed vegetation will give rise to more allochthonous organic com-

关键词： lake sediment allochthonous organic carbon C/N.

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

TLex

引用

软件 1992年第2期13卷 125-139页

作者： KEAR.,sm 励小平

来源：

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

EFFECT　OF　ANNEALING　TEMPERATURE　ON　TEXTURE　OF　COLD－ROLLED　Ni₄₇Ti₄₄Nb₉　SHEET

引用

中国有色金属学会会刊：英文版 1995年第1期5卷 88-93页

作者： YANG, GJ XIE, LY HU, WY DENG, J HAO, sm NW INST NONFERROUS MET RES BAOJI 721014PEOPLES R CHINA NORTHEASTERN UNIV SHENYANG 110006PEOPLES R CHINA

ＥＦＦＥＣＴＯＦＡＮＮＥＡＬＩＮＧＴＥＭＰＥＲＡＴＵＲＥＯＮＴＥＸＴＵＲＥＯＦＣＯＬＤ－ＲＯＬＬＥＤＮｉ４７Ｔｉ４４Ｎｂ９ＳＨＥＥＴＹａｎｇ；ＧｕａｎｊｕｎＸｉｅ；ＬｉｙｉｎｇＨｕ；ＷｅｎｙｉｎｇＤｅｎｇ；ＪｕＨａｏ... 详细信息

ＥＦＦＥＣＴＯＦＡＮＮＥＡＬＩＮＧＴＥＭＰＥＲＡＴＵＲＥＯＮＴＥＸＴＵＲＥＯＦＣＯＬＤ－ＲＯＬＬＥＤＮｉ４７Ｔｉ４４Ｎｂ９ＳＨＥＥＴＹａｎｇ；ＧｕａｎｊｕｎＸｉｅ；ＬｉｙｉｎｇＨｕ；ＷｅｎｙｉｎｇＤｅｎｇ；ＪｕＨａｏ；Ｓｈｉｍｉｎｇ(Ｎｏ?..

关键词： annealing temperature Ni47Ti44Nb9 texture ODF

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

Polyploidy and new chromosome counts in Anaphalis(Asteraceae:Gnaphalieae) from the Qinghai-Tibet Plateau of China

引用

Journal of Systematics and Evolution 2010年第1期48卷 58-64页

作者： 1,2 Ying MENG 1 Hang SUN 1,2 Yong-Ping YANG 1 Ze-Long NIE 1(Laboratory of Biodiversity and Biogeography,Kunming Institute of Botany,Chinese Academy of Sciences,Kunming 650204,China) 2(Institute of Tibetan Plateau Research at Kunming,Chinese Academy of Sciences,Kunming 650204,China) (Laboratory of Biodiversity and Biogeography Kunming Institute of Botany Chinese Academy of Sciences Kunming 650204 China) (Institute of Tibetan Plateau Research at Kunming Chinese Academy of Sciences Kunming 650204 China)

Anaphalis is one of the largest genera of the Asian Gnaphalieae(Asteraceae) and is most diversified on the Qinghai-Tibet *** chromosome numbers and karyomorphology of six species from seven populations were investigated for the first time for this *** numbers have been newly documented for four species:Anaphalis deserti(2n=56=24 median m+24 submedian sm+8 acrocentric st);Anaphalis plicata(2n=56=26m+30sm);Anaphalis xylorhiza(2n=28=2 median point M+14m+12sm);and Anaphalis rhododactyla(2n=56=32m+24sm).Two further counts are in agreement with the previously reported numbers,that is,Anaphalis royleana(2n=28=4M+6m+18sm) and Anaphalis margaritacea(2n=28=12m+16sm).A new polyploid cytotype(2n=56=26m+30sm) was found in the Zougong population of *** is for the first time reported for Anaphalis,with four out of seven counts being *** cytological results suggest that polyploids might have played an important role in the evolution of Anaphalis on the Qinghai-Tibet Plateau.

关键词： Anaphalis DC. Asteraceae chromosome number Gnaphalieae polyploidy Qinghai-Tibet Plateau.

来源：

同方期刊数据库评论

在线全文

同方期刊数据库

学校读者我要写书评

暂无评论

ON CIM ARCHITECTURE

ON CIM ARCHITECTURE

引用

计算机，通信，控制与电力工程国际会议

作者： CHEN Yuliu(sm) ZHANG Weibiao Dept.of Automation Tsinghua University

ISBN: (纸本)0780312333

This paper starts from explaining the importance of CIM architecture and its role in system design and ***,by comparison,the comments on the major existing architectures are given and the main characteristics of each architecture will be presented. Based on these considerations and our own experiences in China,the authors proposed a CIM-OSA-like cube with six views as an effective and practical architecture.

关键词： CIM ON CIM ARCHITECTURE

来源： cnki会议评论

在线全文

cnki会议

学校读者我要写书评

暂无评论

Design of photochromic and electrochemical active azosilane self-assembled monolayer

引用

Chinese Science Bulletin 1997年第14期42卷 1161-1164页

作者： Yu, HZ Wang, YQ Wang, J Cai, sm Liu, ZF Center for Intelligent Materials Research College of Chemistry and Molecular Engineering Peking University Beijing China

THE electrochemical and/or photochemical active organic molecules have attracted much atten-.tion due to their potential applications in the field of molecular electronics. The azobenzenederivatives have been widely studied as typical systems, owing to their reversible trans-cis iso-merization and reduction/oxidation reactions (see fig. 1 (a) ). We have studied the char-acteristic photochromic and electrochemical behavior of azobenzene Langmuir-Blodgett mono-

关键词： azobenzene self-assembled monolayer (SAM) photochromism electrochemistry.

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

欢迎您,

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

请选择保存的检索档案：

请选择收藏分类：

通借通还

欢迎您,

建议与咨询 留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

请选择保存的检索档案： 新增检索档案 确定 取消

请选择收藏分类： 新增自定义分类 确定 取消

通借通还

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

请选择保存的检索档案：

请选择收藏分类：