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Effect of high temperature treatment on the structure and thermal conductivity of 2D carbon/carbon composites with a high thermal conductivity

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Carbon 2015年 82卷 608-608页

作者： Zhi-hai Feng Zhen Fan Qing Kong Xiang Xiong Bo-yun Huang State Key Laboratory of Powder Metallurgy Central South University Changsha 410083 China Key Laboratory of Advanced Functional Composite Materials Aerospace Research Institute of Materials and Processing Technology Beijing 100076 China

High thermal conductivity carbon/carbon composites (HTC-C/Cs) have a high specific modulus and a low thermal expansion in addition to all the excellent properties of traditional C/C composites, which have been a research focus in recent years. 2D HTC-C/Cs were prepared by hot pressure molding, densification by precursor impregnation and pyrolysis, and then heat treatment at high temperatures, using pitch-based carbon fiber fabric with a high thermal conductivity as reinforcement and mesophase pitch as the binder precursor. The structure and morphology of pitch-based carbon fibers and 2D HTC-C/Cs were investigated by XRD, SEM and TEM. The thermal conductivity was measured by laser-flash diffusivity. Results show that with increasing heat treatment temperature the crystallite size increases, the degree of order is improved, the thickness of laminar graphite around the carbon fibers increases, and the number of interfacial cracks between the fiber and matrix decrease and cracks between matrix layers are expanded. A linear relationship between thermal conductivity and heat treatment temperature was observed and the highest thermal conductivity was 443 W/m·K after heat treatment at 3000 °C. [new Carbon materials 2014, 29(5): 357–362]

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26th Annual Computational Neuroscience Meeting (CNS*2017): Part 3 Antwerp, Belgium. 15-20 July 2017 Abstracts

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BMC NEUROSCIENCE 2017年第SUPPL 1期18卷 95-176页

作者： [Anonymous] Department of Neuroscience Yale University New Haven CT 06520 USA Department Physiology & Pharmacology SUNY Downstate Brooklyn NY 11203 USA NYU School of Engineering 6 MetroTech Center Brooklyn NY 11201 USA Departament de Matemàtica Aplicada Universitat Politècnica de Catalunya Barcelona 08028 Spain Institut de Neurobiologie de la Méditerrannée (INMED) INSERM UMR901 Aix-Marseille Univ Marseille France Center of Neural Science New York University New York NY USA Aix-Marseille Univ INSERM INS Inst Neurosci Syst Marseille France Laboratoire de Physique Théorique et Modélisation CNRS UMR 8089 Université de Cergy-Pontoise 95300 Cergy-Pontoise Cedex France Department of Mathematics and Computer Science ENSAT Abdelmalek Essaadi’s University Tangier Morocco Laboratory of Natural Computation Department of Information and Electrical Engineering and Applied Mathematics University of Salerno 84084 Fisciano SA Italy Department of Medicine University of Salerno 84083 Lancusi SA Italy Dipartimento di Fisica Università degli Studi Aldo Moro Bari and INFN Sezione Di Bari Italy Data Analysis Department Ghent University Ghent Belgium Coma Science Group University of Liège Liège Belgium Cruces Hospital and Ikerbasque Research Center Bilbao Spain BIOtech Department of Industrial Engineering University of Trento and IRCS-PAT FBK 38010 Trento Italy Department of Data Analysis Ghent University Ghent 9000 Belgium The Wellcome Trust Centre for Neuroimaging University College London London WC1N 3BG UK Department of Electronic Engineering NED University of Engineering and Technology Karachi Pakistan Blue Brain Project École Polytechnique Fédérale de Lausanne Lausanne Switzerland Departement of Mathematics Swansea University Swansea Wales UK Laboratory for Topology and Neuroscience at the Brain Mind Institute École polytechnique fédérale de Lausanne Lausanne Switzerland Institute of Mathematics University of Aberdeen Aberdeen Scotland UK Department of Integrativ

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Study of Anti-UV and Pigment Dyeing of Nomex/Nylon Blended Fabric

Study of Anti-UV and Pigment Dyeing of Nomex/Nylon Blended F...

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The 89th textile Institute World Conference(第89届世界纺织大会)

作者： Dan Sheng Yunli Wang Xuefeng Lu Guo Huang Weilin Xu Genyang Cao School of Chemistry and Chemical Engineering Wuhan Textile UniversityWuhanChina School of Chemistry and Chemical EngineeringWuhan Textile UniversityWuhanChina State Key Laboratory of New Textile Materials and Advanced TechnologyWuhan Textile UniversityWuhan School of Textile Science and Engineering Wuhan Textile UniversityWuhanChina State Key Laboratory of New Textile Materials and Advanced TechnologyWuhan Textile UniversityWuhan

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Preparation of high voltage spinel LiNi0.5Mn1.5O4 cathode material using polymer-assisted co-precipitation procedure

Preparation of high voltage spinel LiNi0.5Mn1.5O4 cathode ma...

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3rd International Conference on Energy, Environment and Sustainable Development, EESD 2013

作者： Wang, Jian Jian Shao, Wei Quan Chen, Shaou Wang, Chao Li, Shan Dong Li, Hong Liang Xu, Jie Wang, Zhen Physics Science College of Qingdao University Qingdao 266071 China Key Laboratory of Photonics Materials and Technology in University of Shandong Qingdao University Qingdao 266071 China Laboratory of New Fiber Materials and Modern Textile Growing Basis for State Key Laboratory College of Chemistry Chemical Engineering and Environment Qingdao University Qingdao 266071 China

Cathode material LiNi0.5Mn1.5O4 was synthesized via oxalate co-precipitation process using LiCl,NiCl2&middot6H2O and MnCl2&middot4H2O as raw materials, oxalate as precipitant. The effects of calcining temperat... 详细信息

ISBN: (纸本)9783037859728

Cathode material LiNi0.5Mn1.5O4 was synthesized via oxalate co-precipitation process using LiCl,NiCl2·6H2O and MnCl2·4H2O as raw materials, oxalate as precipitant. The effects of calcining temperature and polymer-assisted during the synthetic process on the performance of the products were analyzed. When calcining at 700°C for 10h and with assistance of polyacrylic acid as dispersive, the synthesized product had cubic spinel structure, uniform particle size and the aggregations of particle was reduced. © (2014) Trans Tech Publications, Switzerland.

关键词： Lithium-ion batteries

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Enhanced photoresponse of Cu_2O/ZnO heterojunction with piezo-modulated interface engineering

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Nano Research 2014年第6期7卷 860-868页

作者： Lin Pei Chen Xiang Yan Xiaoqin Zhang Zheng Yuan Haoge Li Peifeng Zhao Yanguang Zhang Yue School of Materials Science and Engineering University of Science and Technology Beijing State Key Laboratory for Advanced Metals and Materials Beijing 100083 School of Materials Science and Engineering University of Science and Technology Beijing State Key Laboratory for Advanced Metals and Materials Beijing Key Laboratory of New Energy Materials and Technologies Beijing 100083

The ability to arbitrarily regulate semiconductor interfaces provides the most effective way to modulate the performance of optoelectronic devices. However, less work has been reported on piezo-modulated interface engineering in all-oxide systems. In this paper, an enhanced photoresponse of an all-oxide Cu_2O/ZnO heterojunction was obtained by taking advantage of the piezotronic effect. The illumination density-dependent piezoelectric modulation ability was also comprehensively investigated. An 18.6% enhancement of photoresponse was achieved when applying a –0.88% compressive strain. Comparative experiments confirmed that this enhancement could be interpreted in terms of the band modification induced by interfacial piezoelectric polarization. The positive piezopotential generated at the ZnO side produces an increase in space charge region in Cu_2O, thus providing an extra driving force to separate the excitons more efficiently under illumination. Our research provides a promising method to boost the performance of optoelectronics without altering the interface structure and could be extended to other metal oxide devices.

关键词： all-oxide device piezotronic effect interface modulation enhanced photoresponse

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Adherence and interaction of cationic quantum dots on bacterial surfaces

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Journal of colloid and interface science 2015年 450卷 388-395页

作者： Cheng Yang Hao Xie Qi-Chang Li En-Jie Sun Bao-Lian Su State Key Laboratory of Advanced Technology for Materials Synthesis and Processing Wuhan University of Technology 122 Luoshi Road Wuhan 430070 PR China School of Chemistry Chemical Engineering and Life Sciences Wuhan University of Technology 122 Luoshi Road Wuhan 430070 PR China. School of Chemistry Chemical Engineering and Life Sciences Wuhan University of Technology 122 Luoshi Road Wuhan 430070 PR China. Electronic address: h.xie@***. School of Chemistry Chemical Engineering and Life Sciences Wuhan University of Technology 122 Luoshi Road Wuhan 430070 PR China. Laboratory of Inorganic Materials Chemistry University of Namur 61 rue de Bruxelles Namur B-5000 Belgium. Electronic address: bao-lian.su@fundp.ac.be.

Understanding molecular mechanisms of interactions between nanoparticles and bacteria is important and essential to develop nanotechnology for medical and environmental applications. Quantum dots (QDs) are specific nanoparticles with unique optical properties and high photochemical stability. In the present study, direct interactions were observed between cationic QDs and bacteria. Distinct fluorescence quenching patterns were developed when cationic QDs interacted with Gram negative and Gram positive bacteria. The aggregation of QDs on bacterial surface as well as fluorescence quenching depends upon the chemical composition and structure of the bacterial cell envelopes. The presence of lipopolysaccharide is unique to Gram-negative bacterial surface and provides negatively charge areas for absorbing cationic QDs. The effects of lipopolysaccharide were proved on fluorescence quenching of cationic QDs. In contrast to Gram-negative bacteria, the presence of teichoic acids is unique to Gram-positive bacterial cell wall and provides negatively charged sites for cationic QDs along the chain of teichoic-acid molecules, which may protect QDs from aggregation and fluorescence quenching. This study may not only provide insight into behaviors of QDs on bacterial cell surfaces but also open a new avenue for designing and applying QDs as biosensors in microbiology, medicine, and environmental science.

关键词： Bacterial cell wall Bacterial surface Cell membrane Fluorescence quenching Gram-negative bacteria Gram-positive bacteria Lipopolysaccharides (LPS) Nanoparticles Quantum dots (QDs) Teichoic-acids

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Graphene: High Detectivity Graphene-Silicon Heterojunction Photodetector (Small 5/2016)

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Small 2016年第5期12卷

作者： Xinming Li Miao Zhu Mingde Du Zheng Lv Li Zhang Yuanchang Li Yao Yang Tingting Yang Xiao Li Kunlin Wang Hongwei Zhu Ying Fang National Center for Nanoscience and Technology Zhongguancun Beijing 100190 P. R. China State Key Laboratory of New Ceramics and Fine Processing School of Materials Science and Engineering Tsinghua University Beijing 100084 P. R. China Department of Chemical Engineering Tsinghua University Beijing 100084 P. R. China CAS Center for Excellence in Brain Science and Intelligence Technology 320 Yue Yang Road Shanghai 200031 P. R. China

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Electrochemical Nanowire Devices for Energy Storage

Electrochemical Nanowire Devices for Energy Storage

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主题：引领工业革命新浪潮——2014第四届国际纳米科技大会

作者： Liqiang Mai State Key Laboratory of Advanced Technology for Materials Synthesis and Processing WUT-Harvard Joint Nano Key Laboratory Wuhan University of Technology

To understand intrinsic reason of capacity fading of nanowire elctrode, we designed the single nanowire electrochemical devices for in situ probing the direct relationship between electrical transport, structure, and electrochemical properties of the single nanowire electrode. Results show that conductivity of the nanowire electrode decreased during the electrochemical reaction, which limits the cycle life. Based on this conclusion, a series of hierarchical structures nanowires have been obtained, including hierarchical MnMoO4/CoMoO4 heterostructured nanowires and hierarchical mesoporous La0.5Sr0.5CoO2.91 nanowires which show enhanced performance in Li-air batteries and supercapacitors.1 In our present work, a series of novel nanowire architectures have been designed and synthesized, including kinked hierarchical nanowires, hierarchical heterostructured nanowires and hierarchical scrolled nanowires which show great electrochemical and biological probe performances.2-4 It is expected that our research may extend effective methods in directions that will solve the challenge of property degradation in energy storage and open new applications.5

关键词： Electrochemical Nanowire Devices for Energy Storage

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On YASS’s Non-monotonic Security Performance

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Circuits, Systems, and Signal processing 2014年第11期33卷 3527-3537页

作者： Yu, Lifang Zhao, Yao Ni, Rongrong Shi, Yun Qing Institute of Information Science Beijing Jiaotong University Beijing100044 China Beijing Key Laboratory of Signal and Information Processing for High-end Printing Equipments Beijing Institute of Graphic Communication Beijing102600 China State Key Laboratory of Rail Traffic Control and Safety Beijing Jiaotong University Beijing100044 China Beijing Key Laboratory of Advanced Information Science and Network Technology Beijing100044 China Department of Electrical and Computer Engineering New Jersey Institute of Technology NewarkNJ07102 United States

Recently, researchers have discovered unexpected bumps in the detection rate curve of yet another steganographic scheme (YASS). We refer to this abnormal phenomenon as non-monotonic security performance. This paper first analyzes this abnormality and points out that it is caused by the non-uniformity in probability of coincidence of (Formula presented.) embedding blocks and (Formula presented.) JPEG blocks. Based on this observation, we propose that further randomizing data embedding positions can overcome the non-monotonic security performance. Experimental results have demonstrated a complete removal of bumps in the detection rate curve of YASS after further randomization. © 2014, Springer Science+Business Media new York.

关键词： Steganography

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Study on the Physical and Chemical Properties of Cotton Fiber in Extreme Environment

Study on the Physical and Chemical Properties of Cotton Fibe...

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The 89th textile Institute World Conference(第89届世界纺织大会)

作者： Xingfang Xiao Chunhua Zhang Canhong Xu Liangjun Xia Ruixue Li Genyang Cao State Key Laboratory of New Textile Materials and Advanced Technology Wuhan Textile UniversityWuhanChina School of Textile Science and Engineering Wuhan Textile University School of Textile Science and EngineeringWuhan Textile University

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