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Development of accumulative roll bonding for metallic co.posite material preparation and mechanical/functional applications

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Journal of Iron and Steel Research International 2024年第11期31卷 2611-2621页

作者： Bo Feng Hao-kun Yang Xiao-hui Li Xiao-wei Feng Tian-lai Chen Guo-feng Li Guangdong Provincial Key Laboratory of Metal Toughening Technology and Application Institute of New MaterialsGuangdong Academy of SciencesGuangzhou 510000GuangdongChina Smart Manufacturing Division Hong Kong Productivity CouncilHong Kong 999077China School of Mechatronic Engineering and Automation Foshan UniversityFoshan 510168GuangdongChina foshan Tongbao electrical Precision Alloy co. Ltd.Foshan 510168GuangdongChina

Accumulative roll bonding(ARB)is a severe plastic deformation method to prepare the metallic co.posite material by physical method at room to elevate temperature,without the generation of additional waste solid or *** the physical characteristicsmulti-material and hybrid structure,the mechanical and function properties of the ARB co.posite material,like Al/steel,Al/Mg,Al/Cu,etc.,shall have the"1+1>2"effect on the mechanical and functional properties,including the remarkable properties that include lightweight,high strength,thermal/electrical co.ductivity,electromagnetic shielding,and other *** deeply investigate the preparation method and microstructural evolution of various metal laminates by ARB,as well as the mechanical and functional properties of the laminate,an overview of the history of ARB technique,the breakthrough of ARB sheet properties,as well as the relative products in industries is ***-tionally,the future development of ARB technology and the utilization of co.posite materials in different areas will be discussed.

关键词： Accumulative roll bonding Metal-co.posite material:Mechanical property Functional property:Industrial application

Intermediate-band solar cells based on dilute alloys and quantum dots

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Frontiers of Optoelectronics 2011年第1期4卷 2-11页

作者： Weiming WANG Jun YANG Xin ZHU Jamie PHILLIPS Department of electrical Engineering and co.puter Science University of Michigan Philips Lumileds lighting co.pany Haosolar co.

This paper describes our recent developments of intermediate-band solar cells, with a focus on the use of dilute alloys and nanostructured materials such as quantum dots(QDs). The co.cept of “full-spectrum” solar cells and their working mechanism with various material structures are first illustrated. A co.prehensive review of ZnTe:Obased intermediate-band solar cells, including material growth, structural and chemical analysis, device modeling and testing, are presented. Finally, the progress and challenges of quantum-dot-based solar cells are discussed.

关键词： full-spectrum solar cell intermediate band dilute alloy quantum dot (QD)

Microstructure of Ag-Sn-Cu-Bi-Ni alloy after oxidation

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中国有色金属学会会刊：英文版 2007年第A1期17卷 551-555页

作者：吴春萍易丹青李荐王斌许灿辉卢小东 School of Materials Science and Engineering Central South University foshan electrical Precision Alloy co. Ltd

Ag-Sn-Cu-Bi-Ni alloy was internally oxidized in air. The phase co.stitution,surface morphology and microstructure evolution of the alloy after internal oxidation were analyzed by X-ray diffractometry,optical microsco.y and scanning electron microsco.y,respectively. The results show that the surface co.or of samples after internal oxidation is different from the different oxidation time and temperatures. The oxidation reaction firstly takes place on the grain boundaries. The microstructure developed on the initial stage of internal oxidation is fir-tree crystal texture. However,this texture structure disappears acco.panied by grain growth and oxides forming during the prolonged oxidation. Finally,the oxide particles are uniformly dispersed in the silver matrix.

关键词：银铜合金表面处理技术微观结构

A Novel Flux-weakening co.trol Method with Quadrature Voltage co.strain for Electrolytic Capacitorless PMSM Drives

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CES Transactions on electrical Machines and Systems 2022年第3期6卷 279-287页

作者： Junya Huo Dawei Ding Zekun Ren Gaolin Wang Nannan Zhao Lianghong Zhu Dianguo Xu the School of electrical Engineering and Automation Harbin Institute of TechnologyHarbin 150001China the Guangdong Midea Air-co.ditioning Equipment co. Ltd.Foshan 528311China IEEE

In electrolytic capacitorless permanent magnet synchronous motor(PMSM) drives, the DC-link voltage will fluctuate in a wide range due to the use of slim film capacitor. When the flux-weakening current is lower than-ψf/Ld during the high speed operation, the flux-weakening co.trol loop will transform to a positive feedback mode, which means the reduction of flux-weakening current will lead to the acceleration of the voltage saturation, thus the whole system will be unstable. In order to solve this issue, this paper proposes a novel flux-weakening method for electrolytic capacitorless motor drives to maintain a negative feedback characteristic of the co.trol loop during high speed operation. Based on the analysis of the instability mechanism in flux-weakening region, a quadrature voltage co.strain mechanism is co.structed to stabilize the ***, the parameters of the co.troller are theoretically designed for easier industrial application. The proposed algorithm is implemented on a 1.5 kW electrolytic capacitorless PMSM drive to verify the effectiveness of the flux-weakening performance.

关键词： Permanent magnet synchronous motor(PMSM) Electrolytic capacitorless drive Flux-weakening co.trol Voltage co.strain Stable operation

Infrared light-emitting diodes based on co.loidal Pb Se/Pb S co.e/shell nanocrystals

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Chinese Physics B 2020年第1期29卷 482-488页

作者： Byung-Ryool Hyun Mikita Marus Huaying Zhong Depeng Li Haochen Liu Yue Xie Weon-kyu Koh Bing Xu Yanjun Liu Xiao Wei Sun Guangdong University Key Laboratory for Advanced Quantum Dot Displays and lighting Shenzhen Key Laboratory for Advanced Quantum Dot Displays and LightingDepartment of Electrical&Electronic EngineeringSouthern University of Science and TechnologyShenzhen 518055China School of electrical and Electronic Engineering Nanyang Technological UniversitySingapore Shenzhen Planck Innovation Technologies co.Ltd Shenzhen 518112China

co.loidal Pb Se nanocrystals(NCs)have gained co.siderable attention due to their efficient carrier multiplication and emissions across near-infrared and short-wavelength infrared spectral ***,the fast degradation of co.loidal Pb Se NCs in ambient co.ditions hampers their widespread applications in infrared *** is well-known that the inorganic thick-shell over co.e improves the stability of ***,we present the synthesis of Pb Se/Pb S co.e/shell NCs showing wide spectral tunability,in which the molar ratio of lead(Pb)and sulfur(S)precursors,and the co.centration of sulfur and Pb Se NCs in solvent have a significant effect on the efficient Pb S shell *** infrared light-emitting diodes(IR-LEDs)fabricated with the Pb Se/Pb S co.e/shell NCs exhibit an external quantum efficiency(EQE)of 1.3%at 1280 *** ligand exchange to optimize the distance between NCs and chloride treatment are important processes for achieving high performance on Pb Se/Pb S *** results provide evidence for the promising potential of Pb Se/Pb S NCs over the wide range of infrared optoelectronic applications.

关键词： Pb Se/Pb S co.e/shell nanocrystal ligand exchange infrared light-emitting diodes external quantum efficiency

A novel co. structure with integrated multifunction

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Journal of Semico.ductors 2013年第5期34卷 100-103页

作者：谢志国李程余彬海王垚浩 Postdoctor of Optical Engineering Sun Yat-sen University foshan Nationstar Optoelectronics co.Ltd.

A novel co. （chip-on-board） structure with integrated multifunction is presented. The structure is prepared by laminating co.per plate with FR4 board and then co.ting with a silver layer to offer high reflectivity and high co.ductivity. In co.parison with MCPCB （aluminum） and ceramics （Al2O3） board, the substrate brings about 10% higher light extracting efficiency than aluminum board and 5% higher flux maintenance ratio than ceramics （Al2O3） board at 3000 h. With integrated multifunction, through an IC co.ponent driving high voltage serial LED chips, the co. can be directly co.nected to AC 110 V or 220 V power supply in lighting application.

关键词： co. integrated multifunction high reflectivity high co.ductivity AC driving

Equilibrium mechanism between dc voltage and ac frequency for ac-dc interlinking co.verters

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iEnergy 2022年第3期1卷 279-284页

作者： Haixu Shi Kai Sun Xiaochao Hou Yunwei Li Haihao Jiang Guangdong Midea Refrigeration Equipment co. Ltd.GuangdongFoshan 528311China Department of electrical Engineering State Key Laboratory of Power SystemsTsinghua UniversityBeijing 100084China Department of electrical and co.puter Engineering University of AlbertaEdmontonAB T6G 1H9Canada

The equilibrium between dc bus voltage and ac bus frequency(Udc-f equilibrium)is the algorithm co.e of unified co.trol strategies for ac-dc interlinking co.verters(ILCs),because the equilibrium implements certain ***,what the mechanism is has not been explicitly explored,which hinders further studies on unified *** paper reveals that the state-space model of a Udc-f equilibrium co.trolled ILC is highly similar to that of a shaft-to-shaft machines *** a detailed mechanism is dis-co.ered and named“virtual shaft-to-shaft machine(VSSM)”mechanism.A significant feature of VSSM mechanism is self-synchro-nization without current sampling or ac voltage sampling.

关键词： Virtual machine interlinking co.verter unified co.trol microgrid.

Raising the capacity of lithium vanadium phosphate via anion and cation co.substitution

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Science China Chemistry 2020年第2期63卷 203-207页

作者： Xian-Xiang Zeng Hui Chen Gang Guo Sheng-Yi Li Jin-Ying Liu Qiang Ma Guote Liu Ya-Xia Yin Xiong-Wei Wu Yu-Guo Guo co.lege of Science Hunan Agricultural UniversityChangsha 410128China Laboratory of Molecular Nanostructure and Nanotechnology Beijing National Laboratory for Molecular SciencesInstitute of ChemistryChinese Academy of Sciences(CAS)Beijing 100190China University of Chinese Academy of Sciences Beijing 100049China co.lege of electrical Engineering and Automation Foshan UniversityFoshan 528225China

The pursuit for batteries with high specific energy provokes the research of high-voltage/capacity cathode materials with superior stability and safety as the alternative for lithium iron ***,using the sol-gel method,a lithium vanadium phosphate with higher average discharge voltage(3.8 V,***+/Li) was obtained from a single source for Mg2+ and Cl-co.substitution and uniform carbon co.ting,and a nearly theoretical capacity(130.1 mA h g^-1) and outstanding rate performance(25 C) are acquired together with splendid capacity retention(80%) after 650 *** work reveals that the well-sized anion and cation substitution and uniform carbon co.ting are of both importance to accelerate kinetic performance in the co.text of nearly undisturbed crystal structure for other analogue *** is anticipated that the electrochemistry co.prehension will shed light on preparing cathode materials with high energy density in the future.

关键词： polyanion cathode ion substitution carbon co.ting high rate theoretical capacity

Fast Li-ion co.duction enabled by graphite fluoride flakes in solid polymer electrolyte

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Rare Metals 2023年第10期42卷 3337-3344页

作者： Qing-Hui Li Xiao-Fen Wang Shi-Yuan Zhu Qing-Dong Zhong Song-Li Liu Qiong-Yu Zhou School of electrical and Information Engineering Changsha University of Science and TechnologyChangsha410114China School of Materials Science and Hydrogen Energy Foshan UniversityFoshan528000China School of Materials Science and Engineering Shanghai UniversityShanghai200444China School of Materials Science and Engineering Yangtze Normal UniversityChongqing400715China

The Li-metal anode in rechargeable Li-metal batteries with a high energy density suffers the side reaction with the liquid electrolytes,resulting in the associated capacity degradation and safety *** electrolytes are designed to solve the safety problems caused by dendrite growth and the limited electrochemical stability of liquid ***,a poly(ethylene oxide)(PEO)-lithium bis(trifluoromethanesulfonyl) imide(LiTFSI) solid polymer electrolyte(SPE) with co.t-wise.

关键词： electrolyte co.duction polymer