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arXiv 2018年

作者： Ying, T.P. Wang, M.X. Zhao, Z.Y. Zhang, Z.Z. Jia, X.Y. Li, Y.C. Lei, B. Li, Q. Yu, Y. Cheng, E.J. An, Z.H. Zhang, Y. Yang, W. Chen, X.H. Li, S.Y. State Key Laboratory of Surface Physics Department of Physics Laboratory of Advanced Materials Fudan University Shanghai200438 China Key Laboratory for Renewable Energy Beijing Key Laboratory for New Energy Materials and Devices Beijing National Laboratory for Condensed Matter Physics Institute of Physics Chinese Academy of Sciences School of Physical Sciences University of Chinese Academy of Sciences Beijing100190 China Hefei National Laboratory for Physical Sciences at Microscale Department of Physics Key Laboratory of Strongly-coupled Quantum Matter Physics Chinese Academy of Sciences University of Science and Technology of China Hefei Anhui230026 China Collaborative Innovation Center of Advanced Microstructures Nanjing210093 China Tianmu Lake Institute of Advanced Energy Storage Technologies Liyang Jiangsu213300 China

A general feature of unconventional superconductors is the existence of a superconducting dome in the phase diagram as a function of carrier concentration1. For the simplest iron-based superconductor FeSe (with transition temperature Tc 8 K)2, its Tc can be greatly enhanced by doping electrons via many routes3-6, even up to 65 K in monolayer FeSe/SiTiO3 (refs. 7-10). However, a clear phase diagram with carrier concentration for FeSe-derived superconductors is still lacking. Here, we report the observation of a series of discrete superconducting phases in FeSe thin flakes by continuously tuning carrier concentration through the intercalation of Li and Na ions with a solid ionic gating technique11. Such discrete superconducting phases are robust against the substitution of Se by 20% S, but are vulnerable to the substitution of Fe by 2% Cu, highlighting the importance of the iron site being intact. A complete superconducting phase diagram for FeSe-derivatives is given, which is distinct from other unconventional superconductors. Copyright © 2018, The Authors. All rights reserved.

关键词： Iron compounds

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Publisher Correction: Atomically engineering activation sites onto metallic 1T-MoS2 catalysts for enhanced electrochemical hydrogen evolution

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Nature communications 2020年第1期11卷 2878页

作者： Yichao Huang Yuanhui Sun Xueli Zheng Toshihiro Aoki Brian Pattengale Jier Huang Xin He Wei Bian Sabrina Younan Nicholas Williams Jun Hu Jingxuan Ge Ning Pu Xingxu Yan Xiaoqing Pan Lijun Zhang Yongge Wei Jing Gu Key Lab of Organic Optoelectronics & Molecular Engineering of Ministry of Education Department of Chemistry Tsinghua University Beijing 100084 P. R. China. Department of Chemistry and Biochemistry San Diego State University 5500 Campanile Drive San Diego CA 92182-1030 USA. State Key Laboratory of Superhard Materials Key Laboratory of Automobile Materials of MOE and School of Materials Science and Engineering Jilin University Changchun 130012 P. R. China. Department of Materials Science and Engineering Stanford University Stanford CA 94305 USA. UC Irvine Materials Research Institute (IMRI) University of California - Irvine Irvine CA 92697 USA. Department of Chemistry Marquette University Milwaukee WI 53201-1881 USA. Collaborative Innovation Center of Advanced Nuclear Energy Technology Institute of Nuclear and New Energy Technology Tsinghua University Beijing 100084 P.R. China. Department of Materials Science and Engineering University of California - Irvine Irvine CA 92697 USA. Department of Physics and Astronomy University of California - Irvine Irvine CA 92697 USA. State Key Laboratory of Superhard Materials Key Laboratory of Automobile Materials of MOE and School of Materials Science and Engineering Jilin University Changchun 130012 P. R. China. lijun_zhang@***. Key Lab of Organic Optoelectronics & Molecular Engineering of Ministry of Education Department of Chemistry Tsinghua University Beijing 100084 P. R. China. yonggewei@***. Department of Chemistry and Biochemistry San Diego State University 5500 Campanile Drive San Diego CA 92182-1030 USA. jgu@sdsu.edu.

An amendment to this paper has been published and can be accessed via a link at the top of the paper.

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Experimental evidence of crystal symmetry protection for the topological nodal line semimetal state in ZrSiS

arXiv

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arXiv 2019年

作者： Sun, J. Yang, W.G. Mao, Z.Q. Pi, L. An, C. Zhou, Y.H. Shu, H.Y. Fu, B.T. Zhou, J.H. Park, C. Guo, Z.P. Gu, Q.Y. Chen, X.L. Hu, J. Gu, C.C. Zhou, Y. Zhang, Y.H. Zhang, R.R. Yao, Y.G. Xi, C.Y. Yang, Z.R. Tian, M.L. Anhui Province Key Laboratory of Condensed Matter Physics at Extreme Conditions High Magnetic Field Laboratory Chinese Academy of Sciences Hefei Anhui230031 China Department of Physics and Engineering Physics Tulane University New OrleansLA70118 United States Department of Physics University of Arkansas FayettevilleAR72701 United States National Laboratory of Solid State Microstructures School of Physics Nanjing University NanjingJiangsu210093 China Beijing Key Laboratory of Nanophotonics and Ultrafine Optoelectronic Systems School of Physics Beijing Institute of Technology Beijing100081 China College of Physics and Electronic Engineering Center for Computational Sciences Sichuan Normal University Chengdu610068 China Insititute of Physical Science and Information Technology School of Physics and Materials Science Anhui University Hefei230601 China HPCAT Geophysical Laboratory Carnegie Institution of Washington ArgonneIL60439 United States Center for High Pressure Science and Technology Advanced Research Shanghai201203 China High Pressure Synergetic Consortium Geophysical Laboratory Carnegie Institution of Washington ArgonneIL60439 United States Collaborative Innovation Center of Advanced Microstructures Nanjing University NanjingJiangsu210093 China Department of Physics Pennsylvania State University University ParkPA16803 United States

Tunable symmetry breaking plays a crucial role for the manipulation of topological phases of quantum matter. Here, through combined high-pressure magneto-transport measurements, Raman spectroscopy, and X-ray diffraction, we demonstrate a pressure-induced topological phase transition in nodal-line semimetal ZrSiS. Symmetry analysis and first-principles calculations suggest that this pressure-induced topological phase transition may be attributed to weak lattice distortions by non-hydrostatic compression, which breaks some crystal symmetries, such as the mirror and inversion symmetries. This finding provides some experimental evidence for crystal symmetry protection for the topological semimetal state, which is at the heart of topological relativistic fermion physics. Copyright © 2019, The Authors. All rights reserved.

关键词： Crystal symmetry

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Interlayer shear of nanomaterials:Graphene–graphene,boron nitride–boron nitride and graphene–boron nitride

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Acta Mechanica Solida Sinica 2017年第3期30卷 234-240页

作者： Yinfeng Li Weiwei Zhang Bill Guo Dibakar Dattac Department of Engineering Mechanics School of Naval Architecture Ocean and Civil Engineering (State Key Laboratory of Ocean Engineering Collaborative Innovation Center for Advanced Ship and Deep-Sea Exploration) Shanghai Jiao Tong University Shanghai 200240 China Department of Materials Science and Engineering University of Pennsylvania Philadelphia PA 19104 USA Department of Mechanical and Industrial Engineering Newark College of Engineering New Jersey Institute of Technology Newark NJ 07102 USA Key Laboratory for Intelligent Nano Materials and Devices of the Ministry of Education Nanjing University of Aeronautics and Astronautics Nanjinq 210016 China

In this paper, the interlayer sliding between graphene and boron nitride （h-BN） is studied by molecular dynamics simulations. The interlayer shear force between h-BN/h-BN is found to be six times higher than that of graphene/graphene, while the interlayer shear between graphene/h-BN is approximate to that of graphene/graphene. The graphene/h- BN heterostructure shows several anomalous interlayer shear characteristics compared to its bilayer counterparts. For graphene/graphene and h-BN/h-BN, interlayer shears only exit along the sliding direction while interlayer shear for graphene/h-BN is observed along both the translocation and perpendicular directions. Our results provide significant insight into the interlayer shear characteristics of 2D nanomaterials.

关键词： Friction Interlayer shear Graphene Hexongal boron nitride Molecular dynamics

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Thermoelectric transport properties of Bi CuSeO with embedded La0.8Sr_(0.2)CoO_3 nanoinclusions

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Science China(Technological Sciences) 2016年第7期59卷 1036-1041页

作者： LIU YaoChun LAN JinLe ZHANG BoPing LIN YuanHua NAN CeWen School of Materials Science and Engineering University of Science and Technology Beijing State Key Laboratory of New Ceramics and Fine Processing School of Materials Science and EngineeringTsinghua University State Key Laboratory of Organic-Inorganic Composites Beijing University of Chemical Technology

The efficiency-upgrading role that La0.8Sr0.2CoO3 plays in the thermoelectric properties of Bi Cu Se O（BCSO） has been studied. LSCO was introduced into BCSO, increasing the electrical conductivity from 3.3 to 52.3 S cm^-1 at 303 K, from 35.8 to 97.3 S cm^-1 at 873 K; respectively. The Seebeck coefficient of all composites still holds around or more than 200 μV/K. Based on the enhanced electrical conductivity and high Seebeck coefficient, the power factor is enhanced by approximately 35%, with the best sample reaching a maximum value of 476.7 μ Wm^-1 K^-2 at 873 K. The lattice thermal conductivity of the nanocomposites is reduced as LSCO content increases from 15 vol% to 30 vol% due to the phonon scattering by nanoparticles and grain boundaries, resulting in a significant reduction in total thermal conductivity. In short, the enhanced thermoelectric figure of merit of 0.67 at 873 K for the sample containing 20 vol% LSCO as compared to 0.53 for the pure sample; announces the promising effect of LSCO on improving thermoelectric properties of Bi Cu Se O.

关键词： Bi Cu Se O La0.8Sr0.2CoO3 thermoelectric composite

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R3-Net: A deep network for multi-oriented vehicle detection in aerial images and videos

arXiv

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arXiv 2018年

作者： Li, Qingpeng Mou, Lichao Xu, Qizhi Zhang, Yun Zhu, Xiao Xiang State Key Laboratory of Virtual Reality Technology and Systems Beijing Key Laboratory of Digital Media School of Computer Science and Engineering Beihang University Beijing100191 China Remote Sensing Technology Institute German Aerospace Center Wessling82234 Germany Signal Processing in Earth Observation Technical University of Munich Munich80333 Germany Canada Research Chair Laboratory in Advanced Geomatics Image Processing Department of Geodesy and Geomatics Engineering University of New Brunswick FrederictonNBE3B 5A3 Canada

Vehicle detection is a significant and challenging task in aerial remote sensing applications. Most existing methods detect vehicles with regular rectangle boxes and fail to offer the orientation of vehicles. However, the orientation information is crucial for several practical applications, such as the trajectory and motion estimation of vehicles. In this paper, we propose a novel deep network, called rotatable region-based residual network (R3-Net), to detect multi-oriented vehicles in aerial images and videos. More specially, R3-Net is utilized to generate rotatable rectangular target boxes in a half coordinate system. First, we use a rotatable region proposal network (R-RPN) to generate rotatable region of interests (R-RoIs) from feature maps produced by a deep convolutional neural network. Here, a proposed batch averaging rotatable anchor (BAR anchor) strategy is applied to initialize the shape of vehicle candidates. Next, we propose a rotatable detection network (R-DN) for the final classification and regression of the R-RoIs. In RDN, a novel rotatable position sensitive pooling (R-PS pooling) is designed to keep the position and orientation information simultaneously while downsampling the feature maps of RRoIs. In our model, R-RPN and R-DN can be trained jointly. We test our network on two open vehicle detection image datasets, namely DLR 3K Munich Dataset and VEDAI Dataset, demonstrating the high precision and robustness of our method. In addition, further experiments on aerial videos show the good generalization capability of the proposed method and its potential for vehicle tracking in aerial videos. The demo video is available at https://***/xCYD-tYudN0. Copyright © 2018, The Authors. All rights reserved.

关键词： Remote sensing

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Factors of Cotton Fabrics Strength Loose and Crease Angle in BTCA Anti-wrinkle Finishing

Factors of Cotton Fabrics Strength Loose and Crease Angle in...

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The 10th textile Bioengineering and Informatics Symposium (TBIS 2017)

作者： Qing-Wei Chen Heng Pan Gen-Yang Cao General Design Institute of Hubei Aerospace Technology Research Institute Ministry of Education Key Laboratory of New Textile Materials Green Processing and Functioning Wuhan Textile University

In this study,1,2,3,4-butane tetracarboxylic acid(BTCA) was applied to analyze the factors contributing to the strength loss of cotton fabrics,which were identified to be acid degradation and *** p H ranged from 1 to 3,the contribution of acid degradation to the strength loss of the fiber was greater,and when the p H was from 4 to 7,the contribution of crosslinking was *** p H 4 and a baking temperature of 140°C,the desired anti-wrinkle effect could be achieved and high strength was observed.

关键词： 1,2,3,4-Butane Tetracarboxylic Acid Anti-wrinkle PH Mechanical Properties Wrinkle Recovery Angle

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Hot Deformation Behaviour of SiC/AA6061 Composites Prepared by Spark Plasma Sintering

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Journal of materials Science & technology 2016年第4期32卷 291-297页

作者： Xiaopu Li Chongyu Liu Kun Luo Mingzhen Ma Riping Liu State Key Laboratory of Metastable Materials Science and Technology Yanshan University Key Laboratory of New Processing Technology for Nonferrous Metal & Materials Ministry of Education Guilin University of Technology Guangxi Key Laboratory of Universities for Clean Metallurgy and Comprehensive Utilization of Nonferrous Metal Resources Guilin University of Technology

In this study, SiC/AA6061 composites with different SiC volume fractions （5%, 10%, 15% and 20%） were fabricated by spark plasma sintering. The deformation behaviour of the composites was studied by uni- axial compression test at temperatures from 573 K to 773 K and strain rates between 0.001 s^-1 and 1 s^-1. Results indicate that the flow stress of SiCIAA6061 composites increases with the increase of SiC volume fraction, with the decrease of deformation temperature and with the decrease of strain rate. The main deformation mechanism of the composites is dynamic recrystallisation （DRX）, and the DRX degree depends on the processing parameters of deformation. Higher SiC volume fraction, higher deformation temper- ature and lower deformation strain rate promote the occurrence of DRX. The strain rate sensitivity and deformation activation energy of SiC/AA6061 composites are calculated. Results show that with the in- crease in deformation temperature and the decrease in SiC volume fraction, the strain rate sensitivity of the composites increases. From 573 K to 773 K, the average deformation activation energy of 5vol.%SiC/ AA6061, 10voI.%SiC/AA6061, 15voI.%SiC/AA6061 and 20vol.%SiC/AA6061 are 20Z91, 230.88, 237.7 and 249.87 kJ mol^-1, respectively. The optimum hot working zone of the SiC/AA6061 composites is in the tem- perature range of 723 K to 773 K at strain rates from 0.1 s^-1 to 1 s^-1.

关键词： Spark plasma sinteringHot deformationAI alloy matrix composites

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Static and Dynamic Precipitation Behavior of the Al-20wt.% Zn Alloy

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Chinese Physics Letters 2016年第5期33卷 63-66页

作者：刘崇宇江鸿杰王春霞亓海全李义兵马明臻刘日平 Key Laboratory of New Processing Technology for Nonferrous Metal & Materials(Ministry of Education) Guilin University of Technology State Key Laboratory of Metastable Materials Science and Technology Yanshan University Guangxi Key Laboratory of Universities for Clean Metallurgy and Comprehensive Utilization of Nonferrous Metal Resources

The static and dynamic precipitation behavior of solution-treated binary Al-20 wt.% Zn alloy is investigated via artificial aging, cold rolling and artificial aging combined with cold rolling. The solution-treated Al-Zn alloy exhibits high thermal stability during aging, and low densities of nano-sized Zn particles are precipitated along with AI grain boundaries after aging at 200℃ for 13 h. Compared with static precipitation, dynamic precipitation occurs more easily in the Al-Zn alloy. Zn clusters are obtained after cold rolling at an equivalent plastic strain of 0.6, and the size of the Zn phase reaches hundreds of nanometers when the strain is increased to 12.1. The results show that the speed of static precipitation can be significantly enhanced after the application of 2.9 rolling strain. Grain refinement and defects induced by cold rolling are considered to promote Zn precipitation. The hardness of Al-Zn alloy is also affected by static and dynamic precipitations.

关键词： Zn Alloy in on as Al Static and Dynamic Precipitation Behavior of the Al-20wt of

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The enhanced performance of piezoelectric nanogenerator via suppressing screening effect with Au particles/ZnO nanoarrays Schottky junction

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Nano Research 2016年第2期9卷 372-379页

作者： Shengnan Lu Qingliang Liao Junjie Qi Shuo Liu Yichong Liu Qijie Liang Guangjie 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

This paper describes a novel strategy to weaken the piezopotential screening effect by forming Schottky junctions on the ZnO surface through the introduction of Au particles onto the surface. With this approach, the piezoelectric-energyconversion performance was greatly enhanced. The output voltage and current density of the Au@ZnO nanoarray-based piezoelectric nanogenerator reached 2 V and 1 μA/cm^2, respectively, 10 times higher than the output of pristine ZnO nanoarray-based piezoelectric nanogenerators. We attribute this enhancement to dramatic suppression of the screening effect due to the decreased carrier concentration, as determined by scanning Kelvin probe microscope measurements and impedance analysis. The lowered capacitance of the Au@ZnO nanoarraybased piezoelectric nanogenerator also contributes to the improved output. This work provides a novel method to enhance the performance of piezoelectric nanogenerators and possibly extends to piezotronics and piezophototronics.

关键词： screening effect piezopotential Schottky junction Au@ZnO nanoarrays piezoelectric nanogenerator

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