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Self Assembly: Shaping Functional Nano-objects by 3D Confined Supramolecular Assembly (Small 24/2013)

Small 2013年第24期9卷

作者： Renhua Deng Fuxin Liang Weikun Li Shanqin Liu Ruijing Liang Mingle Cai Zhenzhong Yang Jintao Zhu Key Laboratory for Large-Format Battery Materials and System of the Ministry of Education School of Chemistry and Chemical Engineering Huazhong University of Science and Technology Wuhan 430074 China State Key Laboratory of Polymer Physics and Chemistry Institute of Chemistry Chinese Academy of Sciences Beijing 100190 China Jintao Zhu Key Laboratory for Large-Format Battery Materials and System of the Ministry of Education School of Chemistry and Chemical Engineering Huazhong University of Science and Technology Wuhan 430074 China Zhenzhong Yang State Key Laboratory of Polymer Physics and Chemistry Institute of Chemistry Chinese Academy of Sciences Beijing 100190 China.

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Evaluation Model for Smart Distribution Network Planning under Energy Interconnection

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IOP Conference Series: Earth and Environmental Science 2019年第4期300卷

作者： Yan Zhang Zefu Jiang Jinsen Liu Wenxia Liu Hua Gao Yanmin Wang Power Grid Planning Research Center of Guizhou Power Grid Co. Ltd Guiyang Guizhou 550003 China State Key Laboratory of Power System and Power Generation Equipment Control and Simulation Department of Electrical Engineering Tsinghua University Haidian Beijing 100084 China

Due to the development of the energy interconnection, smart distribution networks (SDNs) should needs be transformed and upgraded to meet new demands. In order to assess the SDN planning, a new index system was conducted from the five attributes. The quantitative methods of all criteria were also defined. An evaluation model was proposed based on AHP weighting and TOPSIS methods. Empirical analysis was performed to verify the feasibility of the evaluation system.

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Janus Nanodiscs: Janus Nanodisc of Diblock Copolymers (Adv. Mater. 26/2014)

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Advanced Materials 2014年第26期26卷

作者： Renhua Deng Fuxin Liang Peng Zhou Chengliang Zhang Xiaozhong Qu Qian Wang Jiaoli Li Jintao Zhu Zhenzhong Yang State Key Laboratory of Polymer Physics and Chemistry Institute of Chemistry Chinese Academy of Sciences Beijing 100190 China Key Laboratory for Large‐Format Battery Materials and System of the Ministry of Education School of Chemistry and Chemical Engineering Huazhong University of Science and Technology Wuhan 430074 China

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Magnetic Modulation of Terahertz Waves via Spin-Polarized Electron Tunneling Based on Magnetic Tunnel Junctions

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Physical Review Applied 2020年第1期14卷 014032-014032页

作者： Zuanming Jin Jugeng Li Wenjie Zhang Chenyang Guo Caihua Wan Xiufeng Han Zhenxiang Cheng Chao Zhang Alexey V. Balakin Alexander P. Shkurinov Yan Peng Guohong Ma Yiming Zhu Jianquan Yao Songlin Zhuang Terahertz Technology Innovation Research Institute Terahertz Spectrum and Imaging Technology Cooperative Innovation Center Shanghai Key Lab of Modern Optical System University of Shanghai for Science and Technology 516 JunGong Road Shanghai 200093 China Department of Physics Shanghai University 99 Shangda Road Shanghai 200444 China Shanghai Institute of Intelligent Science and Technology Tongji University Shanghai 200092 China Beijing National Laboratory for Condensed Matter Physics Institute of Physics University of Chinese Academy of Sciences Chinese Academy of Sciences Beijing 100190 China Institute for Superconducting and Electronic Materials University of Wollongong Wollongong New South Wales 2500 Australia School of Physics University of Wollongong Wollongong New South Wales 2522 Australia Department of Physics and International Laser Center Lomonosov Moscow State University Leninskie Gory 1 Moscow 19991 Russia STU & SIOM Joint Laboratory for Superintense Lasers and Applications Shanghai 201210 China College of Precision Instrument and Optoelectronics Engineering Tianjin University Tianjin 300110 China

Magnetic tunnel junctions (MTJs) are a key technology in modern spintronics because they are the basis of read-heads of modern hard disk drives, nonvolatile magnetic random access memories, and sensor applications. In this paper, we demonstrate that tunneling magnetoresistance can influence terahertz (THz) wave propagation through a MTJ. In particular, various magnetic configurations between parallel state and antiparallel state of the magnetizations of the ferromagnetic layers in the MTJ have the effect of changing the conductivity, making a functional modulation of the propagating THz electromagnetic fields. Operating in the THz frequency range, a maximal modulation depth of 60% is reached for the parallel state of the MTJ with a thickness of 77.45 nm, using a magnetic field as low as 30 mT. The THz conductivity spectrum of the MTJ is governed by spin-dependent electron tunneling. It is anticipated that the MTJ device and its tunability scheme will have many potential applications in THz magnetic modulators, filtering, and sensing.

关键词： Magnetoresistance Photoconductivity Ultrafast magnetic effects Magnetic tunnel junctions Terahertz time-domain spectroscopy

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The Reduced Contribution of Coal Combustion to Pb in Particle Phase after Coal-to-Gas in Urban beijing, China

SSRN

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SSRN 2023年

作者： Lian, Xiufeng Liu, Fengxian Peng, Long Tang, Guigang Dao, Xu Guo, Hui Cheng, Chunlei Zhang, Guohua Bi, Xinhui Tang, Mei Lia, Lei Zhoua, Zhen Lia, Mei Institute of Mass Spectrometry and Atmospheric Environment Guangdong Provincial Engineering Research Center for On-line Source Apportionment System of Air Pollution Jinan University Guangzhou510632 China State Key Laboratory of Organic Geochemistry Guangdong Provincial Key Laboratory of Environmental Protection and Resources Utilization Guangzhou Institute of Geochemistry Chinese Academy of Sciences Guangzhou510640 China Guangdong-Hongkong-Macau Joint Laboratory of Collaborative Innovation for Environmental Quality Guangzhou510632 China Taiyuan University of Technology Shanxi Taiyuan030024 China College of Ecology and Environment Xin Jiang University Urumqi830046 China China National Environmental Monitoring Centre Beijing100012 China Hunan Province Environmental Monitoring Cerner Hunan410014 China Guangdong MS Institute of Scientific Instrument Innovation Guangzhou510700 China

Coal-to-gas (replacing coal with natural gas) is an important energy transformation strategy for addressing environmental, but the improvement of atmospheric Pb pollution from coal-to-gas remains poorly understood. beijing has basically realized coal-free in urban and plain areas by the end of 2018. A single particle aerosol mass spectrometry (SPAMS) was deployed to investigate the mixing state and chemical processing of Pb-rich particles in urban beijing in 2019. Based on a large dataset of mass spectra, this study find K-Na-EC and K-OC particles associated with coal combustion. The contribution of coal combustion to atmospheric Pb decreased significantly, and iron/steel industries are the most important source of Pb after coal-to-gas. The atmospheric Pb in beijing urban area is mainly transmitted from surrounding provinces such as Mongolia Province, Hebei Province, Liaoning Province, Anhui Province and Shandong Province. These Pb in Pb-rich particles are mainly in the form of Pb(NO3)2, through photochemical and/or aqueous phase reactions of PbCl2 and HNO3 and/or NO2 in the gas phase. These results assess the effect of coal-to-gas on the source structure and mixing state of Pb particles, and indicate that Pb pollution still needs to be paid attention to because Pb(NO3)2 abundance increases with improved control quality. © 2023, The Authors. All rights reserved.

关键词： Gases

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High-Quality Passive Acoustic Mapping with the Cross-Correlated Angular Spectrum Method

arXiv

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arXiv 2024年

作者： Zeng, Yi Zhu, Hui Li, Jinwei Li, Jianfeng Li, Fei Lu, Shukuan Cai, Xiran The School of Information Science and Technology ShanghaiTech University Shanghai201210 China The Gene Editing Center School of Life Science and Technology State Key Laboratory of Advanced Medical Materials and Devices ShanghaiTech University Shanghai201210 China The Shanghai Advanced Research Institute Chinese Academy of Sciences Shanghai201210 China The University of Chinese Academy of Sciences Beijing100049 China The Paul C. Lauterbur Research Center for Biomedical Imaging Shenzhen Institutes of Advanced Technology Chinese Academy of Sciences Shenzhen518055 China The Key Laboratory of Biomedical Information Engineering of Ministry of Education Department of Biomedical Engineering School of Life Science and Technology Xi'an Jiaotong University Xi'An710049 China The School of Information Science and Technology Shanghai Engineering Research Center of Intelligent Vision and Imaging ShanghaiTech University Shanghai201210 China The Key Laboratory of Biomedical Imaging Science and System Chinese Academy of Sciences Shenzhen518055 China

While passive acoustic mapping (PAM) has been advanced for monitoring acoustic cavitation activity in focused ultrasound (FUS) therapy, achieving both real-time and high-quality imaging capabilities is still challenging. The angular spectrum (AS) method presents the most efficient algorithm for PAM, but it suffers from artifacts and low resolution due to the diffraction pattern of the imaging array. Data-adaptive beamformers suppress artifacts well, but their overwhelming computational complexity, more than two orders of magnitude higher than the classical time exposure acoustic (TEA) method, hinders their application in real-time. In this work, we introduce the cross-correlated AS method to address the challenge. This method is based on cross-correlating the AS back-propagated wave fields, in the frequency domain, measured by different apodized sub-apertures of the transducer array to provide the normalized correlation coefficient (NCC) matrix for artifacts suppression. We observed that the spatial pattern of NCC matrix is variable which can be utilized by the triple apodization with cross-correlation (TAX) with AS scheme, namely the AS-TAX method, for optimal artifacts suppression outcomes. Both the phantom and mouse tumor experiments showed that: 1) the AS-TAX method has comparable image quality as the data-adaptive beamformers, reducing the energy spread area by 34.8-66.6% and improving image signal-to-noise ratio by 10.7-14.5 dB compared to TEA;2) it reduces the computational complexity by two orders of magnitude compared to TEA allowing millisecond-level image reconstruction speed with a parallel implementation;3) it can well map microbubble cavitation activity of different status (stable or inertial). The AS-TAX method represents a real-time approach to monitor cavitation-based FUS therapy with high image quality. Copyright © 2024, The Authors. All rights reserved.

关键词： Frequency domain analysis

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Space‐Confinement‐Induced Synthesis of Pyridinic‐ and Pyrrolic‐Nitrogen‐Doped Graphene for the Catalysis of Oxygen Reduction†

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Angewandte Chemie 2013年第45期125卷

作者： Wei Ding Zidong Wei Siguo Chen Xueqiang Qi Tao Yang Jinsong Hu Dong Wang Li‐Jun Wan Shahnaz Fatima Alvi Li Li The State Key Laboratory of Power Transmission Equipment and System Security and New Technology College of Chemistry and Chemical Engineering Chongqing University Shapingba 174 Chongqing (China) Institute of Chemistry The Chinese Academy of Sciences Beijing 100190 (China)

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Rotation Speed Recovery Strategy Based On Variable Power Curve of Inertia Control from DFIG Wind Turbine

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IOP Conference Series: Earth and Environmental Science 2018年第1期192卷

作者： R Liu P Song X S Wang Z W Lin State Key Laboratory of Alternate Electrical Power System with Renewable Energy Sources School of Control and Computer Engineering North China Electric Power University Beijing 102206 PR China State Grid Jibei Electric Power Research Institute North China Electric Power Research Institute Co. Ltd. Beijing 100045 China Grid-connected Operation Technology for Wind-Solar Storage Hybrid System State Grid Corporation Key Laboratory Beijng 100045 China

With the increase of wind power capacity incorporated into the grid, the permeability of wind power increases continuously, which leads to the reduction of the equivalent inertia of the system. A new strategy of recovering rotor speed that increases the output power by modifying the variable power curve is proposed in this paper, which decreases the drop of the active power. So as to reduce the secondary frequency dips caused by the sudden drop of the active power when the speed restores. The paper optimizes the secondary frequency dips by modifying the variable power curve continuously. This article simulates this strategy through setting up a system by Simulink. Compared with the traditional recovery strategy, validity of the proposed strategy is demonstrated through simulation and analysis.

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Rotation Speed Recovery Strategy Based On Particle Swarm Optimization for Variable Power Curve Optimization

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IOP Conference Series: Materials Science and engineering 2018年第3期439卷

作者： Rui Liu Peng Song Xiaosheng Wang Yang Cui Zhongwei Lin State Key Laboratory of Alternate Electrical Power System with Renewable Energy Sources School of Control and Computer Engineering North China Electric Power University Beijing 102206 PR China phone: *** State Grid Jibei Electric Power Research Institute North China Electric Power Research Institute Co. Ltd. Beijing 100045 China Grid-connected Operation Technology for Wind-Solar Storage Hybrid System State Grid Corporation Key Laboratory Beijng 100045 China

With the increase of wind power capacity incorporated into the grid, the permeability of wind power increases continuously, which leads to the reduction of the equivalent inertia of the system. Rotor speed recovery will cause the secondary frequency dips when DFIG uses rotor inertial control to participate in system frequency modulation. In order to optimize the secondary frequency dips, this paper uses PSO (Particle Swarm Optimization) to optimize the Parameters of Variable Power Functions on the basis of the previously proposed variable power curve strategy. This article simulates this strategy through setting up a system by Simulink. Simulate the results of optimization, compared with the traditional recovery strategy, validity of the proposed strategy is demonstrated through simulation and analysis.

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Phyllotaxis-inspired nanosieves with multiplexed orbital angular momentum

arXiv

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arXiv 2021年

作者： Jin, Zhongwei Janoschka, David Deng, Junhong Ge, Lin Dreher, Pascal Frank, Bettina Hu, Guangwei Ni, Jincheng Yang, Yuanjie Li, Jing Yu, Changyuan Lei, Dangyuan Li, Guixin Xiao, Shumin Mei, Shengtao Giessen, Harald zu Heringdorf, Frank Meyer Qiu, Cheng-Wei Department of Electrical and Computer Engineering National University of Singapore 4 Engineering Drive 3 Singapore117583 Singapore College of Optical and Electronic Technology China Jiliang University Hangzhou310018 China University of Duisburg–Essen Lotharstrasse 1-21 Duisburg47057 Germany Department of Materials Science and Engineering Shenzhen Institute for Quantum Science and Engineering Southern University of Science and Technology Shenzhen518055 China Beijing Qianjunyide Technology Co. Ltd. Beijing100031 China University of Stuttgart StuttgartD-70569 Germany School of Physics University of Electronic Science and Technology of China Chengdu611731 China Key Laboratory of Optoelectronic Materials Technical Institute of Physics and Chemistry Chinese Academy of Sciences Beijing100190 China Department of Electronic and Information Engineering Hong Kong Polytechnic University Hung Hom Kowloon Hong Kong Hong Kong Department of Materials Science and Engineering City University of Hong Kong 83 Tat Chee Avenue Kowloon Hong Kong Hong Kong State Key Laboratory on Tunable Laser Technology Ministry of Industry and Information Technology Key Lab of Micro-Nano Optoelectronic Information System Shenzhen Graduate School Harbin Institute of Technology Shenzhen518055 China

Nanophotonic platforms such as metasurfaces, achieving arbitrary phase profiles within ultrathin thickness, emerge as miniaturized, ultracompact and kaleidoscopic optical vortex generators. However, it is often required to segment or interleave independent sub-array metasurfaces to multiplex optical vortices in a single nano-device, which in turn affects the device’s compactness and channel capacity. Here, inspired by phyllotaxis patterns in pine cones and sunflowers, we theoretically prove and experimentally report that multiple optical vortices can be produced in a single compact phyllotaxis nanosieve, both in free space and on a chip, where one meta-atom may contribute to many vortices simultaneously. The time-resolved dynamics of on-chip interference wavefronts between multiple plasmonic vortices was revealed by ultrafast time-resolved photoemission electron microscopy. Our nature-inspired optical vortex generator would facilitate various vortex-related optical applications, including structured wavefront shaping, free-space and plasmonic vortices, and high-capacity information metaphotonics. Copyright © 2021, The Authors. All rights reserved.

关键词： Plasmonics

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