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Recent Advances in Electrochemical-Based Silicon Production Technologies with Reduced Carbon Emission

Research 2024年第1期2023卷 209-236页

作者： Feng Tian Zhongya Pang Shen Hu Xueqiang Zhang Fei Wang Wei Nie Xuewen Xia Guangshi Li Hsien-Yi Hsu Qian Xu Xingli Zou Li Ji Xionggang Lu State Key Laboratory of Advanced Special Steel&Shanghai Key Laboratory of Advanced Ferrometallurgy&School of Materials Science and Engineering Shanghai University99#Shangda RoadShanghai 200444China Center for Hydrogen Metallurgy Technology Shanghai UniversityShanghai 200444China State Key Laboratory of ASIC and System School of MicroelectronicsFudan University220#Handan RoadShanghai 200433China School of Energy and Environment Department of Materials Science and EngineeringCity University of Hong KongKowloon TongHong KongChina

Sustainable and low-carbon-emission silicon production is currently one of the main focuses for the metallurgical and materials science ***,considered a promising strategy,has been explored to produce silicon due to prominent advantages:(a)high electricity utilization efficiency;(b)low-cost silica as a raw material;and(c)tunable morphologies and structures,including films,nanowires,and *** review begins with a summary of early research on the extraction of silicon by *** has been placed on the electro-deoxidation and dissolution–electrodeposition of silica in chloride molten salts since the 21st century,including the basic reaction mechanisms,the fabrication of photoactive Si films for solar cells,the design and production of nanoSi and various silicon components for energy conversion,as well as storage ***,the feasibility of silicon electrodeposition in room-temperature ionic liquids and its unique opportunities are *** this basis,the challenges and future research directions for silicon electrochemical production strategies are proposed and discussed,which are essential to achieve large-scale sustainable production of silicon by electrochemistry.

关键词： directions electrodeposition electricity

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Significantly enhanced flashover voltage of epoxy in vacuum by graded surface roughness modification

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High Voltage 2023年第5期8卷 997-1010页

作者： Inzamam Ul Haq Feipeng Wang Shakeel Akram Muneeb Ahmed Muhammad Tariq Nazir State Key Laboratory of Power Transmission Equipment&System Security and New Technology Chongqing UniversityChongqingChina College of Electrical Engineering and Control Science Nanjing Tech UniversityNanjingChina State Key Laboratory of Electrical Insulation and Power Equipment Xi'an Jiaotong UniversityXi'anChina School of Engineering RMIT UniversityMelbourneVictoriaAustralia

The flashover strength of epoxy(EP)insulations in the High voltage direct current applications of future energy grids can be improved by tailoring their surface *** work aims to improve the DC surface flashover characteristics of EP after being treated with sandpaper of different *** with virgin EP and homogenously modified EP considering varying surface roughness(R_(a)=0.54,3.16,5.24,and 8.35μm)are *** experimental characterisations,such as water contact angle,surface intrinsic conductivity,surface voltages,flashover strength,and trap distributions are conducted and evaluated to analyse the difference between virgin and treated ***,based on the obtained experimental results of homogenously treated EP and theoretical analysis,the concept of surface functionally graded materials(SFGMs)is put *** flashover voltages of homogenously treated EP are augmented significantly compared to virgin EP regardless of the voltage polarity and enhanced by enhancing the surface *** sample T_(Model‐C) with SFGM design shows a 45.02%and 43.75%improvement in the negative and positive flashover voltages than that of the virgin *** the end,COMSOL simulations are conducted to justify the experimental findings and to analyse the difference between virgin and modified samples in terms of electric field distribution.

关键词： flash graded roughness

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A Two-stage Stochastic Mixed-integer Programming Model for Resilience Enhancement of Active Distribution Networks

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Journal of Modern Power systems and Clean Energy 2023年第1期11卷 94-106页

作者： Hongzhou Chen Jian Wang Jizhong Zhu Xiaofu Xiong Wei Wang Hongrui Yang State Key Laboratory of Power Transmission Equipment&System Security and New Technology Chongqing UniversityChongqing 400044China South China University of Technology Guangzhou 510641China Electric Power Research Institute State Grid Chongqing Electric Power CompanyChongqing 401123China IEEE

Most existing distribution networks are difficult to withstand the impact of meteorological disasters. With the development of active distribution networks(ADNs), more and more upgrading and updating resources are applied to enhance the resilience of ADNs. A two-stage stochastic mixed-integer programming(SMIP) model is proposed in this paper to minimize the upgrading and operation cost of ADNs by considering random scenarios referring to different operation scenarios of ADNs caused by disastrous weather events. In the first stage, the planning decision is formulated according to the measures of hardening existing distribution lines, upgrading automatic switches, and deploying energy storage resources. The second stage is to evaluate the operation cost of ADNs by considering the cost of load shedding due to disastrous weather and optimal deployment of energy storage systems(ESSs) under normal weather condition. A novel modeling method is proposed to address the uncertainty of the operation state of distribution lines according to the canonical representation of logical constraints. The progressive hedging algorithm(PHA) is adopted to solve the SMIP model. The IEEE 33-node test system is employed to verify the feasibility and effectiveness of the proposed method. The results show that the proposed model can enhance the resilience of the ADN while ensuring economy.

关键词： Active distribution network(ADN) resilience disastrous weather event stochastic programming

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An ISAR Image Reconstruction Method via Signal Support Reweighted l1 Minimization 2

An ISAR Image Reconstruction Method via Signal Support Rewei...

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2nd IEEE International Conference on Signal, Information and Data Processing, ICSIDP 2024

作者： Zhao, Tiehua Wu, Qihua Xu, Zhiming Ai, Xiaofeng Zhao, Feng Xiao, Shunping National University of Defense Technology The State Key Laboratory of Complex Electromagnetic Environment Effects on Electronics and Information System College of Electronic Science and Technology Changsha China

ISBN: (纸本)9798331515669

The sparse aperture caused by data loss or unintentional interference is the actual problem in radar imaging process. Therefore, a compressed sensing (CS) based ISAR image reconstruction method with signal support aided is proposed in this paper. Firstly, the signal support is constructed from FFT-based imaging results. Then the signal support is introduced as a prior information into the reweighted function during the CS reconstruction. The simulation results show that, when the azimuth effective aperture ratio is as low as 30 % and signal-to-noise ratio (SNR) equals to -10 dB, the proposed method can obtain clear imaging results like that of complete aperture data. Besides, compared with the traditional CS reconstruction method, the number of false points in the reconstruction results by proposed method is greatly reduced. © 2024 IEEE.

关键词： Radar imaging

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Dynamic Response Characteristics of Multi-Generation system Integrated with Gas and Heat Storage

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Journal of Thermal Science 2025年第3期34卷 913-935页

作者： WANG Xiaomeng DUAN Liqiang ZHENG Nan WANG Qiushi Beijing Laboratory of New Energy Storage Technology North China Electric Power University School of Energy Power and Mechanical Engineering North China Electric Power University State Key Laboratory of Alternate Electric Power System with Renewable Energy Sources (NCEPU) North China Electric Power University Institute of Technology for Carbon Neutralization College of ElectricalEnergy and Power EngineeringYangzhou University

In this paper,a new multi-generation system,incorporating solid oxide fuel cell(SOFC),gas turbine(GT),lithium bromide chiller,gas and heat storage components is proposed to address the issues of volatility in user load and energy source input and mismatching between supply and *** dynamic model and control strategy of the system are established,and the system dynamic characteristics in response to solar DNI and external load disturbances are *** system can rapidly adjust the key output and input parameters to realize a new supply-demand balance in a shorter period of time by multiple PID control *** response processes of two combined cooling,heating and power(CCHP) systems with and without gas storage to cope with load changes are *** results show that the CCHP system with gas storage can effectively shorten the response time of load *** solar collector and the SOFC-GT can reach a new equilibrium within a few tens of seconds under the *** response time of the methanol reactor is longer compared to those of solar collector and the SOFC-GT,taking several minutes to *** the cooling and heating load change,the system can adjust the output to the demand value within 500 and 260 seconds.

关键词： dynamic analysis energy storage load-following methanol to hydrogen multi-generation system

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Performance Analysis of Corroded Grounding Devices with an Accurate Corrosion Model

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CSEE Journal of Power and Energy systems 2023年第3期9卷 1235-1247页

作者： Yihua Dan Zhanlong Zhang Pengfei Gan Huarui Ye Qiaoyi Li Jun Deng State Key Laboratory of Power Transmission Equipment&System Security and New Technology Chongqing UniversityChongqing 400030China Test Centre of EHV Transmission Company China Southern Power GridGuangzhou 510663China

Grounding devices are significant to the operation of the power transmission line and power *** soil and leakage current can easily cause the corrosion of carbon steel grounding devices,resulting in power ***,most carbon steel grounding devices in service are already corroded,and the accurate calculation of grounding parameters for corroded grounding devices is ***,most existing methods for calculating the grounding parameters of corroded grounding devices usually have the following disadvantages:1)They only consider whether the grounding devices are broken or not,and cannot analyze the grounding parameters of grounding devices with different corrosion degrees;2)They assume that the corroded grounding device is a conductor with a smaller diameter,and ignore the impact of the corrosion product layer,resulting in calculation *** solve the above problems,this paper establishes an accurate corrosion model for grounding devices based on the volume expansion coefficient of corrosion *** grounding parameters calculation method for corroded grounding devices is proposed based on the boundary element method(BEM)and Galerkin’s *** the grounding performance of tower grounding grids with different corrosion degrees in different soils(uniform and layered)is ***,some features of grounding parameters of corroded grounding devices are *** study can accurately calculate the grounding parameters of the corroded grounding devices and has far-reaching engineering significance for the safety of power equipment.

关键词： Corroded grounding devices corrosion product layer grounding parameters volume expansion coefficient

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RA Loss: Relation-Aware Loss for Robust Person Re-identification 16th

RA Loss: Relation-Aware Loss for Robust Person Re-identific...

引用

16th Asian Conference on Computer Vision, ACCV 2022

作者： Wang, Kan Hu, Shuping Cheng, Jun Cheng, Jun Pang, Jianxin Tan, Huan Guangdong Provincial Key Laboratory of Robotics and Intelligent System Shenzhen Institute of Advanced Technology Chinese Academy of Sciences Shenzhen China Guangdong Provincial Key Laboratory of Robot Localization and Navigation Technology UBTech Robotics Corp Ltd. Shenzhen China Institute for Infocomm Research A*STAR Singapore Singapore

ISBN: (纸本)9783031262838

Previous relation-based losses in person re-identification (ReID) typically comprise two sequential steps: they firstly sample both positive pair and negative pair and then deploy constraints to simultaneously improve intra-identity compactness and inter-identity separability. However, existing relation-based losses usually place emphasis on exploring the relation between images and therefore consider only several pairs during each optimization. This inevitably leads to different convergence status for pairs of the same kind and brings about the intra-pair variance problem. Accordingly, we propose a novel Relation-Aware (RA) loss to address the intra-pair variance via exploring the informative relation across pairs. In brief, we introduce a macro-constraint and a micro-constraint. The macro-constraint encourages the separation of positive pair and negative pair via pushing far apart the two "centers" of the positive pair and the negative pair. The "center" of each kind of pair are obtained via averaging all the pairs of the same kind. The micro-constraint further enhances the compactness by minimizing the discrepancies among pairs of the same kind. The two constraints work cooperatively to relieve the intra-pair variance and improve the quality of pedestriansąŕ representation. Results of extensive experiments on three widely used ReID benchmarks, i.e., Market-1501, DukeMTMC-ReID and CUHK03, demonstrate that the RA loss brings improvements over existing relation-based losses. © 2023, The Author(s), under exclusive license to Springer Nature Switzerland AG.

关键词： Deep learning

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An insight into the pass effect of the planet gear from an elastodynamics perspective

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Science China(Technological Sciences) 2023年第8期66卷 2415-2431页

作者： HUANGFU YiFan DONG XingJian CHEN KangKang LI ZhanWei PENG ZhiKe Institute of Vibration Shock and NoiseState Key Laboratory of Mechanical System and VibrationShanghai Jiao Tong UniversityShanghai 200240China National Key Laboratory of Science and Technology on Helicopter Transmission Nanjing University of Aeronautics and AstronauticsNanjing 210016China School of Mechanical Engineering Ningxia UniversityYinchuan 750021China

Distinguished from parallel-axis gear systems,the revolution of the carrier brings out the pass effect of the planet *** with the phenomenological descriptions in conventional studies,this paper aims to provide more abundant physical information and the elastodynamics mechanism of the pass effect of the planet *** this end,a continuous-discrete model of helical planetary gears is *** both the in-plane and out-of-plane vibration,a semi-analytical model is established to simulate the elastic ring *** elastic and the lumped parameter submodels are synthesized using the moving elastic coupling *** simulated modal and dynamic characteristics are verified using a planetary gear test *** on the proposed dynamic model,the pass effect of the planet gear,the effects of bolt constraint,and the out-of-plane vibration of helical planetary gears are *** is revealed that the“realistic rotation”strategy adopted in the proposed dynamic model can better reflect the physical essence of the pass effect of the planet gear compared with the“pseudo rotation”strategy utilized in the traditional model.

关键词： planetary gear elastodynamics pass effect semi-analytical model dynamic characteristics

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Research Status and Trends of Indoor Positioning and Navigation technology in China

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Journal of Geodesy and Geoinformation Science 2023年第3期6卷 87-101页

作者： Baoguo YU Lu HUANG Yachuan BAO Haonan JIA Shuang LI Chong CHEN Academy for Network&Communications of CETC Shijiazhuang 050081China State Key Laboratory of Satellite Navigation System and Equipment Technology Shijiazhuang 050081China

As an essential component of future comprehensive Positioning,Navigation,and Timing(PNT)system,indoor positioning technology has extensive application demands,making it a focal point of attention in both academia and *** article comprehensively reviews the research status of indoor positioning technology in China,with a focus on highlighting representative achievements and application validations from major research institutions in recent *** addresses the challenges and issues faced in promotion and application of large-scale,high-precision indoor ***,a universal and seamless indoor-outdoor positioning system architecture is proposed,along with a technical roadmap and key technologies to achieve this ***,an analysis and outlook on future technological trends are presented.

关键词： indoor positioning location services integrated PNT

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Dynamic synchronous motion accuracy measurement and estimation for a five-axis mirror milling system

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Science China(Technological Sciences) 2023年第3期66卷 689-705页

作者： XU Kun TANG XinYu BI QingZhen YU YangBo QIAN DeHou JI YuLei State Key Laboratory of Mechanical System and Vibration School of Mechanical EngineeringShanghai Jiao Tong UniversityShanghai 200240China Shanghai TOP Numerical Control Technology Co. Ltd.Shanghai 201100China

A mirror milling system(MMS)comprises two face-to-face five-axis machine tools,one for the cutting spindle and the other for the support *** it is essential to maintain the cutter and support coaxial during the cutting process,synchronous motion accuracy is the key index of the *** paper proposed a novel method for measuring and estimating the synchronous motion accuracy of the dual five-axis machine *** method simultaneously detects errors in the tool center point(TCP)and tool axis direction(TAD)during synchronous *** implement the suggested method,a measurement device,with five high-precision displacement sensors was developed.A kinematic model was then developed to estimate the synchronous motion accuracy from the displacement sensor *** screw theory was used to obtain the analytical expression of the inverse kinematic model,and the synchronous motion error was compensated and adjusted based on the inverse kinematic model of the dual five-axis machine *** and TAD quasi-static errors,such as geometric and backlash errors,were first *** adjusting the servo parameters,the dynamic TCP and TAD errors,such as gain mismatch and reversal spike,were also *** proposed method and device were tested in a large MMS,and the measured quasi-static and dynamic errors were all reduced when the compensation and adjustment method was *** Carlo simulations were also used to estimate the uncertainty of the proposed scheme.

关键词： mirror milling synchronous motion error five-axis machine tool measurement dynamic accuracy

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