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Integrated active sensor system for real time vibration monitoring

Scientific reports 2015年第1期5卷 16063页

作者： Qijie Liang Xiaoqin Yan Xinqin Liao Shiyao Cao Shengnan Lu Xin Zheng Yue Zhang State Key Laboratory for Advanced Metals and Materials School of Materials Science and Engineering University of science and technology Beijing Beijing 100083 China. Key Laboratory of New Energy Materials and Technologies University of Science and Technology Beijing Beijing 100083 China.

We report a self-powered, lightweight and cost-effective active sensor system for vibration monitoring with multiplexed operation based on contact electrification between sensor and detected objects. The as-fabricated sensor matrix is capable of monitoring and mapping the vibration state of large amounts of units. The monitoring contents include: on-off state, vibration frequency and vibration amplitude of each unit. The active sensor system delivers a detection range of 0-60 Hz, high accuracy (relative error below 0.42%), long-term stability (10000 cycles). On the time dimension, the sensor can provide the vibration process memory by recording the outputs of the sensor system in an extend period of time. Besides, the developed sensor system can realize detection under contact mode and non-contact mode. Its high performance is not sensitive to the shape or the conductivity of the detected object. With these features, the active sensor system has great potential in automatic control, remote operation, surveillance and security systems.

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Hydrogen sulfide at high pressure: Change in stoichiometry

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Physical Review B 2016年第17期93卷 174105-174105页

作者： Alexander F. Goncharov Sergey S. Lobanov Ivan Kruglov Xiao-Miao Zhao Xiao-Jia Chen Artem R. Oganov Zuzana Konôpková Vitali B. Prakapenka Key Laboratory of Materials Physics Institute of Solid State Physics Chinese Academy of Sciences Hefei Anhui 230031 China Geophysical Laboratory Carnegie Institution of Washington Washington DC 20015 USA University of Science and Technology of China Hefei 230026 China V. S. Sobolev Institute of Geology and Mineralogy SB RAS Novosibirsk 630090 Russia Moscow Institute of Physics and Technology Dolgoprudny Moscow Region 141700 Russia All-Russia Research Institute of Automatics Moscow 127055 Russia Department of Physics South China University of Technology Guangzhou 510640 China Center for High Pressure Science and Technology Advanced Research Shanghai 201203 China Skolkovo Institute of Science and Technology Skolkovo Innovation Center Moscow 143026 Russia Department of Geosciences Center for Materials by Design and Institute for Advanced Computational Science State University of New York Stony Brook New York 11794-2100 USA Northwestern Polytechnical University Xi'an 710072 China DESY Photon Science Notkestrasse 85 D-22607 Hamburg Germany Center for Advanced Radiation Sources University of Chicago Chicago Illinois 60637 USA

Hydrogen sulfide (H2S) was studied by x-ray synchrotron diffraction and Raman spectroscopy up to 150 GPa at 180–295 K and by quantum-mechanical variable-composition evolutionary simulations. The experiments show that H2S becomes unstable with respect to formation of compounds with different structure and composition, including Cccm and a body-centered cubic like (R3m or Im−3m) H3S, the latter one predicted previously to show a record-high superconducting transition temperature, a Tc of 203 K. These experiments provide experimental ground for understanding of this record-high Tc. The experimental results are supported by theoretical structure searches that suggest the stability of H3S, H4S3, H5S8, H3S5, and HS2 compounds that have not been reported previously at elevated pressures.

关键词： Composition Phase diagrams Pressure effects Superconducting gap High-temperature superconductors Superconductors Raman spectroscopy X-ray scattering

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Highly excited exciton-polariton condensates

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Physical Review B 2017年第24期95卷 245122-245122页

作者： Tomoyuki Horikiri Tim Byrnes Kenichiro Kusudo Natsuko Ishida Yasuhiro Matsuo Yutaka Shikano Andreas Löffler Sven Höfling Alfred Forchel Yoshihisa Yamamoto Yokohama National University Tokiwadai 79-5 Hodogaya-ku Yokohama Kanagawa 240-8501 Japan National Institute of Informatics Hitotsubashi 2-1-2 Chiyoda-ku Tokyo 101-8430 Japan E. L. Ginzton Laboratory Stanford University Stanford California 94305 USA The University of Tokyo 7-3-1 Hongo Bunkyo-ku Tokyo 113-8656 Japan Center for Emergent Matter Science RIKEN 2-1 Hirosawa Wakoshi Saitama 351-0198 Japan State Key Laboratory of Precision Spectroscopy School of Physical and Material Sciences East China Normal University Shanghai 200062 China NYU-ECNU Institute of Physics at NYU Shanghai 3663 Zhongshan Road North Shanghai 200062 China New York University Shanghai 1555 Century Avenue Pudong Shanghai 200122 China Department of Physics New York University New York New York 10003 USA Research Center of Integrative Molecular Systems Institute for Molecular Science 38 Nishigo-Naka Myodaiji Okazaki 444-8585 Japan Institute for Quantum Studies Chapman University 1 University Drive Orange California 92866 USA Materials and Structures Laboratory Tokyo Institute of Technology 4259 Nagatsuta Midori Yokohama 226-8503 Japan Research Center for Advanced Science and Technology (RCAST) The University of Tokyo 4-6-1 Komaba Meguro-ku Tokyo 153-8904 Japan Technische Physik Universität Würzburg Am Hubland D-97074 Würzburg Germany SUPA School of Physics and Astronomy University of St. Andrews St. Andrews KY16 9SS United Kingdom ImPACT Program Japan Science and Technology Agency 7 Gobancho Chiyoda-ku Tokyo 102-0076 Japan

Exciton polaritons are a coherent electron-hole-photon (e-h-p) system where condensation has been observed in semiconductor microcavities. In contrast to equilibrium Bose-Einstein condensation (BECs) for long lifetime systems, polariton condensates have a dynamical nonequilibrium feature owing to the similar physical structure that they have to semiconductor lasers. One of the distinguishing features of a condensate to a laser is the presence of strong coupling between the matter and photon fields. Irrespective of its equilibrium or nonequilibrium nature, exciton polaritons have been observed to maintain strong coupling. We show that by investigating the high-density regime of exciton-polariton condensates, the negative branch is directly observed in photoluminescence. This is evidence that the present e-h-p system is still in the strong-coupling regime, contrary to past results where the system reduced to standard lasing at high density.

关键词： Exciton polariton Excitons Quantum phase transitions Quasiparticles & collective excitations Quantum wells Semiconductor microcavities Photoluminescence

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Preparation of high-strength Al-Mg-Si-Cu-Fe alloy via heat treatment and rolling

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International Journal of Minerals,Metallurgy and materials 2014年第7期21卷 702-710页

作者： Chong-yu Liu Peng-fei Yu Xiao-ying Wang Ming-zhen Ma Ri-ping Liu State Key Laboratory of Metastable Materials Science and Technology Yanshan University Key Laboratory of New Processing Technology for Nonferrous Metal & Materials Ministry of EducationGuilin University of Technology College of Materials Science and Engineering Guilin University of Technology

An Al-Mg-Si-Cu-Fe alloy was solid-solution treated at 560℃ for 3 h and then cooled by water quenching or furnace cooling. The alloy samples which underwent cooling by these two methods were rolled at different temperatures. The microstructure and mechanical properties of the rolled alloys were investigated by optical microscopy, scanning electron microscopy, transmission electron microscopy, X-ray diffraction analysis, and tensile testing. For the water-quenched alloys, the peak tensile strength and elongation occurred at a rolling temperature of 180℃. For the furnace-cooled alloys, the tensile strength decreased initially, until the rolling temperature of 420℃, and then increased;the elongation increased consistently with increasing rolling temperature. The effects of grain boundary hardening and dislocation hardening on the mechanical properties of these rolled alloys decreased with increases in rolling temperature. The mechanical properties of the 180℃ rolling water-quenched alloy were also improved by the presence ofβ″phase. Above 420℃, the effect of solid-solution hardening on the mechanical properties of the rolled alloys increased with increases in rolling temperature.

关键词： aluminum alloys heat treatment rolling mechanical properties microstructure

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Hierarchical nanowires for high-performance electrochemical energy storage

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Frontiers of physics 2014年第3期9卷 303-322页

作者：李硕董轶凡王丹丹陈伟黄磊石长玮麦立强 State Key Laboratory of Advanced Technology for Materials Synthesis and Processing WUT Harvard Joint Nano Key Laboratory Wuhan University of Technology Wuhan 430070 China

Nanowires are promising candidates for energy storage devices such as lithium-ion batteries, su- per（：*** and lithium-air batteries. However, simple-structured nanowires have some limitations hence the strategies to make improvements need to be explored and investigated. Hierarchical nanowires with enhanced periormanee have been considered as an ideal candidate for energy storage due to the novel structures and/or synergistic properties. This review describes some of the recent progresses in the hierarchical nanowire merits, classification, synthesis and performance in energy storage applieat, ions. Herein we discuss the hierarchical nanowires based on their structural design from three major categories, including exterior design, interior design and aligned nanowire assembly. This review also briefly outlines the prospects of hierarchical nanowires in morphology control, property enhancement and application versatility.

关键词： hierarchical nanowires exterior design interior design electrochemical performance energy storage

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Metastable amorphous chromium-vanadium oxide nanoparticles with superior performance as a new lithium battery cathode

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Nano Research 2014年第11期7卷 1604-1612页

作者： Jinzhi Sheng Qidong Li Qiulong Wei Pengfei Zhang Qinqin Wang Fan Lv Qinyou An Wei Chen Liqiang Mai State Key Laboratory of Advanced Technology for Materials Synthesis and Processing WUT-Harvard Joint Nano Key LaboratoryWuhan University of Technology Wuhan 430070 China

The main drawbacks of vanadium oxide as a cathode material are its low conductivity, low practical capacity and poor cycling stability. Adding Cr can improve its conductivity and a metastable amorphous state may provide higher capacity and stability. In this work, metastable amorphous Cr-V-O nano- particles have been successfully prepared through a facile co-precipitation reaction followed by annealing treatment. As a cathode material for lithium batteries, the metastable amorphous Cr-V-O nanoparticles exhibit high capacity （260 mAh/g at 100 mA/g between 1.5-4 V）, low capacity loss （more than 80% was retained after 200 cycles at 100 mA/g） and high rate capability （up to 3 A/g）.

关键词： Cr2V4O13 nanoparticles metastable amorphous structure lithium battery

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Self-Powered Photoelectrochemical Biosensor Based on CdS/RGO/ZnO Nanowire Array Heterostructure

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Small (Weinheim an der Bergstrasse, Germany) 2016年第2期12卷 245-51页

作者： Kun Zhao Xiaoqin Yan Yousong Gu Zhuo Kang Zhiming Bai Shiyao Cao Yichong Liu Xiaohui Zhang Yue Zhang State Key Laboratory for Advanced Metals and Materials School of Materials Science and Engineering University of Science and Technology Beijing Beijing 100083 China. Key Laboratory of New Energy Materials and Technologies University of Science and Technology Beijing Beijing 100083 China.

A CdS/reduced graphene oxide (RGO)/ZnO nanowire array (NWAs) heterostructure is designed, which exhibits enhanced photoelectrochemical (PEC) activity compared to pure ZnO, RGO/ZnO, and CdS/ZnO. The enhancement can be attributed to the synergistic effect of the high electron mobility of ordered 1D ZnO NWAs, extended visible-light absorption of CdS nanocrystals, and the formed type II band alignment between them. Moreover, the incorporation of RGO further promotes the charge carrier separation and transfer process due to its excellent charge collection and shuttling characteristics. Subsequently, the CdS/RGO/ZnO heterostructure is successfully utilized for the PEC bioanalysis of glutathione at 0 V (vs Ag/AgCl). The self-powered device demonstrates satisfactory sensing performance with rapid response, a wide detection range from 0.05 mm to 1 mm, an acceptable detection limit of 10 μm, as well as certain selectivity, reproducibility, and stability. Therefore, the CdS/RGO/ZnO heterostructure has opened up a promising channel for the development of PEC biosensors.

关键词： CdS nanocrystals ZnO nanowire arrays biosensors glutathione photoelectrochemical biosensors reduced graphene oxide

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Two-dimensional magnetic boron

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Physical Review B 2016年第8期93卷 085406-085406页

作者： Xiang-Feng Zhou Artem R. Oganov Zhenhai Wang Ivan A. Popov Alexander I. Boldyrev Hui-Tian Wang School of Physics and Key Laboratory of Weak-Light Nonlinear Photonics Nankai University Tianjin 300071 China Department of Geosciences Center for Materials by Design and Institute for Advanced Computational Science Stony Brook University Stony Brook New York 11794 USA Skolkovo Institute of Science and Technology 3 Nobel St. Moscow 143026 Russia School of Materials Science Northwestern Polytechnical University Xi'an 710072 China Peter Grünberg Research Center Nanjing University of Posts and Telecommunications Nanjing Jiangsu 210003 China Department of Chemistry and Biochemistry Utah State University Logan Utah 84322 USA National Laboratory of Solid State Microstructures and Collaborative Innovation Center of Advanced Microstructures Nanjing University Nanjing 210093 China

We predict a two-dimensional (2D) antiferromagnetic (AFM) boron (designated as M-boron) by using ab initio evolutionary methodology. M-boron is entirely composed of B20 clusters in a hexagonal arrangement. Most strikingly, the highest valence band of M-boron is isolated, strongly localized, and quite flat, which induces spin polarization on either cap of the B20 cluster. This flat band originates from the unpaired electrons of the capping atoms and is responsible for magnetism. M-boron is thermodynamically metastable and is the first magnetic 2D form of elemental boron.

关键词： 2-dimensional systems Carbon-based materials Ab initio calculations

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Preparation and electrical properties of the new lead-free (1 - X )Bi0.5Na0.5TiO3-xBa(Ni1/3Nb2/3)O3 piezoelectric ceramics

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Journal of the Ceramic Society of Japan 2015年第1443期123卷 1038-1042页

作者： Pan, Zhao An, Mingjie Chen, Jun Fan, Longlong Liu, Laijun Fang, Liang Xing, Xianran Department of Physical Chemistry University of Science and Technology Beijing Beijing100083 China State Key Laboratory for Advanced Metallurgy University of Science and Technology Beijing Beijing100083 China Key Laboratory of New Processing Technology for Nonferrous Metals and Materials Ministry of Education Guilin University of Technology Guilin541004 China

A new lead-free piezoelectric ceramics of (1 - x)Bi0.5Na0.5TiO3-xBa(Ni1/3Nb2/3)O3 (BNTBNN) (x = 0.00.07) have been prepared by a conventional solid reaction method. Their structures and electric properties have been investigated systematically. A pure perovskite phase can be formed in x ≤ 0.06. By the introduction of Ba(Ni1/3Nb2/3)O3, the ceramics exhibit a lower coercive field EC. Composition for x = 0.02 shows optimal piezoelectric properties, with the piezoelectric coefficient d33 = 121 pC/N. Temperature dependent P(E) loops and S(E) curves of 0.98BNT0.02BNN indicate that the phase transition from the ferroelectric to antiferroelectric takes place over a very wide temperature range from 75 to 150°C. © 2015 The Ceramic Society of Japan. All rights reserved.

关键词： Perovskite

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Synthesis and optoelectronic properties of a novel molecular semiconductor of dithieno[5,6-b:11,12-b']coronene-2,3,8,9-tetracarboxylic tetraester

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Chinese Chemical Letters 2014年第1期25卷 65-68页

作者： Chun Zhan You-Yu Jiang Ming-Yan Yang Lu-Hua Lu Sheng-Qiang Xiao State Key Laboratory of Advanced Technology for Materials Synthesis and Processing Wuhan University of Technology WUT-USG Joint Laboratory of Advanced Optoelectronic Materials and Devices Wuhan University of Technology Center for Chemical and Materials Engineering Wuhan University of Technology

A facile procedure for the synthesis ofdithieno[5,6-b：11,12-b＇]coronene-2,3,8,9-tetracarboxylic tetra（2- ethylhexyl）ester （DTCTI＇E-EH） from readily available perylene-3,4,9,10-tetracaroboxylic dianhydride is described. The electronic properties of DTCTTE-EH were elucidated on the basis of UV-vis spectra, emission spectrum and electrochemical measurement, which demonstrate that DTCTTE is a new class of components for promising semiconducting materials.

关键词： Polycyclic aromatic molecules Coronene tetracarboxylic tetraester Semiconductor Optoelectronic property

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