检索结果-南通市图书馆

Electrode materials for advanced lithium-ion batteries

在线全文

学校读者我要写书评

暂无评论

Electrode materials for advanced lithium-ion batteries

Polar differential power attacks and evaluation

第十二届中国固态离子学学术会议

作者： S.X. Dou institute for superconducting & electronic materials, university of wollongong, nsw 2522, australia

Several types of cathode materials and anode materials have been developed for lithium-ion battery applications. Layered Li[Li0.3Cr0.1Mn0.6]O2 cathode material with a hexagonal structure wassynthesized by a solid-state reaction. The structural changes of this material were studied using a synchrotron based in situ x-ray diffraction technique during charge/discharge cycles. A series of LiMxFe1-xPO4 (M = Mg, Zr, Ti) phosphates were synthesized via a sol-gel method, followed by thermal treatment at medium temperature. HRTEM analysis reveals that a layer of amorphous carbon was coated on the surface of the LiMxFe1-xPO4 particles, which substantially increases the electronic conductivity of the bulk of LiMxFe1-xPO4 electrodes. Near full capacity (170 mAh/g) was achieved at the C/8 rate at room temperature for LiMxFe1-xPO4 electrodes. The doped LiMxFe1-xPO4 electrodes demonstrated better electrochemical performance than that of undoped LiFePO4 at high charge/discharge rate. Nanocrystalline Si-mesocarbon microbeads (MCMB) composite anode materials were prepared by ball milling. SEM observation shows that the spherical shape of MCMB particles can be retained via moderate ball-milling. It was found that ball-milling conditions have an impact on the capacity and cyclability of nanocrystalline Si-MCMB composites. The optimised Si-MCMB composite anode demonstrated a reversible capacity of 1066 mAh/g with good cyclability. A reaction model has been proposed to explain the reaction mechanisms of lithium insertion and extraction in the Si-MCMB electrode. WS2 nanotubes were synthesised by sintering amorphous WS2 at high temperature under flowing hydrogen. High resolution TEM observation revealed that the as-prepared WS2 nanotubes have an open end with an inner hollow core of about 4.6 nm. We studied the lithium intercalation behaviour of WS2 nanotubes. The WS2 nanotubes demonstrated a stable cyclability in a wide voltage range (0.1 - 3.1 V versus Li/Li+). The nanotubes could provid

关键词：

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

Science China(Information Sciences) 2012年第7期55卷 1588-1604页

作者： TANG Ming 1 ,QIU ZhenLong 1 ,GAO Si 1,2 ,YI Mu 3 ,LIU ShuBo 1 ,ZHANG HuanGuo 1 & JIN YingZhen 1 1 School of Computer Science,Wuhan university,Wuhan 430072,China 2 State Key Laboratory of Information Security,institute of Software,Chinese Academy of Sciences,Beijing 100190,China 3 Centre for Computer and Information Security Research School of Computer Science and Software Engineering university of wollongong,wollongong,nsw 2522,australia 1. School of Computer Science Wuhan University Wuhan 430072 China2. State Key Laboratory of Information Security Institute of Software Chinese Academy of Sciences Beijing 100190 China3. Centre for Computer and Information Security Research School of Computer Science and Software Engineering University of Wollongong Wollongong NSW 2522 Australia

Side channel attacks (SCAs) on security software and hardware have become major concerns on computer and system *** existing SCAs generally require the knowledge of the corresponding cryptographic algorithm and implementation adopted in the target; therefore,they are not fully suitable for practical *** this paper,we propose a novel SCA-polar differential power attack (polar DPA).We found that DPA peaks have different biases for different cryptographic algorithms and *** on these biases,we can successfully attack a block cipher,assuming that the cipher algorithm uses a secret key in its first round,without the knowledge of the cipher algorithm or *** rounds can be treated as a black *** present a detailed theoretical analysis and experiment to demonstrate the correctness and efficiency of our ***,our scheme has demonstrated an improvement over the leakage evaluation scheme due to Ichikawa et al.(CHES 2005).Our evaluation method can be used in electronic design automatic (EDA) flows and can help security circuit designers to understand the data leakage due to SCAs.

关键词： computer security differential power attack side channel attack

CRYSTAL STRUCTURE AND X-RAY POWDER DIFFRACTION DATA FOR RE COMPOUND HoNiSb

在线全文

同方期刊数据库

学校读者我要写书评

暂无评论

中国有色金属学会会刊：英文版 1995年第3期5卷 71-73页

作者： Zeng, Lingmin Li, Jungqin Zhang, Liping Zhuang, Yinghong Hao, Jianmin (institute of materials Science, Guangxi university, Nanning 530004)(Tianjin electronic Materzals Research institute) Guangxi Univ Nanning China

ＣＲＹＳＴＡＬＳＴＲＵＣＴＵＲＥＡＮＤＸ－ＲＡＹＰＯＷＤＥＲＤＩＦＦＲＡＣＴＩＯＮＤＡＴＡＦＯＲＲＥＣＯＭＰＯＵＮＤＨｏＮｉＳｂ￥Ｚｅｎｇ，Ｌｉｎｇｍｉｎ；Ｌｉ，Ｊｕｎｇｑｉｎ；Ｚｈａｎｇ，Ｌｉｐｉｎｇ；Ｚｈｕａｎｇ... 详细信息

ＣＲＹＳＴＡＬＳＴＲＵＣＴＵＲＥＡＮＤＸ－ＲＡＹＰＯＷＤＥＲＤＩＦＦＲＡＣＴＩＯＮＤＡＴＡＦＯＲＲＥＣＯＭＰＯＵＮＤＨｏＮｉＳｂ￥Ｚｅｎｇ，Ｌｉｎｇｍｉｎ；Ｌｉ，Ｊｕｎｇｑｉｎ；Ｚｈａｎｇ，Ｌｉｐｉｎｇ；Ｚｈｕａｎｇ，Ｙｉｎｇｈｏｎｇ；Ｈａｏ，Ｊｉａ...

关键词： RE compound HoNiSb X-ray diffraction data crystal structure

Investigation on growth and laser properties of new laser crystal Nd:Gd_(0.8)La_(0.2)VO_4

在线全文

学校读者我要写书评

暂无评论

Chinese Science Bulletin 1999年第9期44卷 863-864页

作者： ZHANG Huaijin , MENG Xianlin , ZHU Li ZHANG Hongzhen , WANG Pu , Judith Dawes , WANG Changqing and Y. T. Chowinstitute of Crystal materials and National Laboratory of Crystal materials , Shandong university , Jinan 250100, China Center for Lasers and Applications , Macquarie university , nsw2109, australia Department of electronic Engineering , City university of Hong Kong , China institute of Crystal materials and National Inboratory of Crystal materialsr Shandng Unitvrsity Jinan China Center for Lasers and Applicatwns Macquarie Uniuersity Australia Department of electronic Engineering City University of Hong Kong China

LASER-DIODE （LD） pumped solid-state lasers have a variety of applications in military, industry, medical treatment and scientific researches due to their high stability, compactness, high efficiency and long lifetime, and become one of the hot points in the laser field. In this field, Nd: YVO4 laser has been commercialized. Nd:GdVO4 crystal has a big absorption coefficient, high thermal conductivity, and excellent laser properties. Nd: Gd0.5La0.5VO4 crystal formed by La3+ ions replacing some Gd3+ ions in Nd:GdVO4 has larger FWHM （full width at half maximum） than Nd: GdVO4 crystal. To combine the merits of Nd : GdVO4 and Nd : Gd0.5 La0.5 VO4, we grow the crystal doped with 20% La (Nd: Gd0.8La0.2VO4, and study its properties. Now we introduce the laser and spectroscopic properties of the crystal in brief.

关键词： Nd Gd VO4 La

The Synthesis, Photoconductivity, Photoinduced Charge Transfer, and Other Properties of HEC-TCNQ

在线全文

学校读者我要写书评

暂无评论

Chinese Chemical Letters 1997年第1期8卷 75-78页

作者： Qi FANG Hong LEI Dong XU Duo Rong YUAN(institute of Crystal materials, Shandong university, Jinan 250100Department of electronic Engineering, Shandong university, Jinan 250100) SHANDONG UNIV INST CRYSTAL MATJINAN 250100PEOPLES R CHINA SHANDONG UNIV DEPT ELECT ENGNJINAN 250100PEOPLES R CHINA

The donor-acceptor complex HEC-TCNQ (HEC = 9-hydroxyethylcarbazole; TCNQ = tetracyanoquinodimethane) has been synthesized. Under the illumination of Ar+ laser, the photoinduced charge transfer salt HEC(+)TCNQ(-) can b... 详细信息

关键词： HEC The Synthesis Photoconductivity Photoinduced Charge Transfer and Other Properties of HEC-TCNQ

Crystallization behavior of Ni_(54)Mn_(25.1)Ga_(20.9) ferromagnetic shape memory thin film

在线全文

学校读者我要写书评

暂无评论

Rare Metals 2007年第S1期26卷 139-142页

作者： MARTIN Saunders Centre for Microscopy and Microanalysis University of Western AustraliaNedlandsW.A.6009Australia

NiMnGaferromagnetic shape memory thin film was deposited onto Al foil using *** sputtering *** crystallization behavior of the film was investigated by XRD and *** activation energy of crystallization of the film was calculated by Kissinger’s *** results show that the crystallization temperature of NiMnGafree-standing thin film in martensite state is 372 ℃,and the activation energy of crystallization is about 191.9 kJ·mol-1.

关键词： Ni-Mn-Ga ferromagnetic shape memory alloys thin films crystallization

s-ordering operator expansions of quantum-mechanical fundamental representations and their applications

在线全文

学校读者我要写书评

暂无评论

Science China(Physics,Mechanics & Astronomy) 2011年第12期54卷 2150-2154页

作者： FAN HongYi 1,3 , XU YeJun 2 & YUAN HongChun 3,4 1 Department of materials Science and Engineering, university of Science and Technology of China, Hefei 230026, China 2 Department of Physics electronic and Engineering, Chizhou university, Chizhou 247000, China 3 Department of Physics, Shanghai Jiao Tong university, Shanghai 200030, China 4 College of Optoelectronic Engineering, Changzhou institute of Technology, Changzhou 213002, China 1. Department of materials Science and Engineering University of Science and Technology of China Hefei 230026 China3. Department of Physics Shanghai Jiao Tong University Shanghai 200030 China2. Department of Physics Electronic and Engineering Chizhou University Chizhou 247000 China4. College of Optoelectronic Engineering Changzhou Institute of Technology Changzhou 213002 China

We show that the quantum-mechanical fundamental representations, say, the coordinate representation, the coherent state representation, the Fan-Klauder entangled state representation can be recast into s-ordering operator expansion, which is elegant in form and has many applications in deriving new operator identities. This demonstrates that Dirac's symbolic method can be merged into Newton-Leibniz integration theory in a broad way.

关键词： s-ordering operator expansion operator identities quantum mechanical representation

Properties of nonadiabatic quantum fluctuations of the strongly coupled electron-phonon systems

在线全文

学校读者我要写书评

暂无评论

Science China(Physics,Mechanics & Astronomy) 2008年第3期51卷 258-268页

作者： PANG XiaoFeng institute of Life Science and Technology,university of electronic Science and Technology of China,Chengdu 610054,China International Centre for materials Physics,Chinese Academy of Sciences,Shenyang 110015,China institute of Life Science Technology University of Electronic Science Technology of China Chengdu 610054 China International Centre for materials Physics Chinese Academy of Sciences Shenyang 110015 China

A new variational-ansatz of states of electrons and phonons was proposed on the basis of the Holstein model in strongly coupled electron-phonon systems for studying the influence of nonadiabatic phonon fluctuation,arising from the motion and density fluctuation of electrons,on the properties of ground state,uncertainty relation,stability of polarons,charge density wave (CDW) and phonon staggered ordering. The new ansatz represents the correlation among the displacement and squeezing states of phonons and polaron’s state of electrons as well as the squeezing-antisqueezing effect. The correlation and squeezing-antisqueezing ef-fect result in the decrease of ground state energy,enhancement of stability of the systems,increase of binding energy of the polarons,weakening of the growing speed of polaron narrowing of the electron band,increase of the charge density wave order and suppression of the increased tendency of anomalous quantum fluctuation of the phonons in such a case,when compared with the uncorrelated case in the systems. The results obtained show that the ground state determined by the new state ansatz is most stable,thus the new ansatz describing the properties of the coupled electron phonon systems is very relevant and available,especially in strongly coupled and largely squeezed cases.

关键词： squeezing-antisqueezing effect state-ansatz polaron coupled electron-phonon systems quantum fluctuation

Molecular Electrical Conductor Ni(C_3S_5)_2

在线全文

学校读者我要写书评

暂无评论

Journal of materials Science & Technology 1996年第6期12卷 457-460页

作者： Hong LEI (Dept. of electronic Engineering, Shandong university, Jinan 250100, China)Qi FANG and Minhua JIANG (institute of Crystal materials, Shandong university, Jinan 250100, China)Yueming SUN (Dept. of Chemistry Southeast university Nanjing 210093, Ch Dept. of electronic Engineering Shandong University Jinan 250100 China institute of Crystal materials Shandong University Jinan 250100 China Dept. of Chemistry Southeast University Nanjing 210093 China

The molecular based electrical conductor Ni(C3S5)2 has been prepared and its conductivity has been measured from room temperature down to 60 K. Above 167 K Ni(C3S5)2 exhibits a semiconductive behaviour, below this temperature it turns to exhibit metallic conductivity. Based on a tight-binding energy band calculation, an expression for the number of conducting electrons has been deduced. The calculated conducting activation energy is quite well in accordance with the measuring value.

关键词： Molecular Electrical Conductor Ni C3S5 Pt