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SSRN 2023年

作者： Huang, Tong Liu, Xin Ma, Ruibin Gao, Yangyang Xu, Xiaomin Yan, Chengrun Guo, Yuchen Li, Xiaoxu Sharma, Kamlesh Liu, Lingling Xue, Jiandang Huang, Huadong Zhang, Xiyuan Yin, Xiaochun Zhai, Shaoxiong Chen, Jiechao Jia, Xiaoyang He, Shaojian Lin, Jun Zhang, Liqun Qin, Yanzhou State Key Laboratory of Engines School of Mechanical Engineering Tianjin University Tianjin300072 China Sichuan Diwei Energy Technology Co. Ltd. Mianyang621000 China State Key Laboratory of Materials-Oriented Chemical Engineering College of Chemical Engineering Nanjing Tech University Nanjing211816 China Chengdu Vehicle Environmental Protection Technology Co. Ltd. Chengdu610093 China State Key Laboratory of Organic-Inorganic Composites Beijing University of Chemical Technology Beijing100029 China State Key Laboratory of Clean Energy Utilization Zhejiang University Hangzhou310007 China State Key Laboratory of Polymer Materials Engineering Sichuan University Chengdu610065 China Graduate School of Frontier Sciences The University of Tokyo Chiba277-8561 Japan Guangdong Provincial Key Laboratory of Fuel Cell Technology South China University of Technology Guangzhou510640 China Guangdong Provincial Key Laboratory of Technique and Equipment for Macromolecular Advanced Manufacturing South China University of Technology Guangzhou510640 China Beijing Institute of Smart Energy Beijing101499 China Key Laboratory of Advanced Materials of Ministry of Education Tsinghua University Beijing100084 China Chongqing Key Laboratory of Green Aviation Energy and Power Chongqing Jiaotong University Chongqing401120 China Guangdong Provincial Key Laboratory of Distributed Energy Systems Dongguan University of Technology Dongguan523808 China State Key Laboratory of Alternate Electrical Power System with Renewable Energy Sources North China Electric Power University Beijing102206 China Kharagpur India

Interfacial compatibility between filler and matrix substantially affects the overall morphology and performance of nanocomposites. Compared with bare montmorillonite (MMT), surface modified product such as sulfonated MMT (SMMT) has been known to render optimized interfacial compatibility in composite proton exchange membranes (PEMs) for proton exchange membrane fuel cells (PEMFCs) and direct methanol fuel cells (DMFCs). Nevertheless, in-depth understanding and investigation on the sulfonation of MMT are seldom focused, such as uniformity and sufficiency. Herein, these broadly neglected issues are proposed and resolved using an exemplary polynorepinephrine (PNE)-regulated SMMT (SNMMT). Rather than direct sulfonation utilizing the inherent hydroxyl groups of MMT, a PNE coating with ample hydroxyl groups is deposited on MMT beforehand, which results in more homogeneous and sufficient sulfonation of SNMMT. Compared with normal SMMT, this alteration on surficial geography of filler functionalization brings significant benefits when composited with Nafion matrix, including harmonized filler-matrix compatibility, improved mechanical stability and enhanced proton conduction. Moreover, the antioxidative ability of PNE layer enables improved chemical stability of nanocomposite PEM. The Nafion/SNMMT composite PEM achieves 0.275 S cm-1 proton conductivity at 95 ºC in water, evidently beyond any previously reported composite PEMs using normal SMMT. Equipped with this reformed nanocomposite PEM, both PEMFC and DMFC display competitive peak power densities (1.121 W cm-2 with H2/O2 at 80 ºC/100% relative humidity (RH) for PEMFC, and 0.228 W cm-2 with 1.6 M methanol/100% RH O2 for DMFC), and simultaneously show minor performance deteriorations in constant current density operation and RH cycle tests. It would be instructive the specific focus and reformation on the uniformity and sufficiency of filler modification may render significant interface and performance advancements for na

关键词： Nanocomposites

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Localized collocation schemes and their applications

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Acta Mechanica Sinica 2022年第7期38卷 1-28,I0002页

作者： Zhuojia Fu Zhuochao Tang Qiang Xi Qingguo Liu Yan Gu Fajie Wang Key Laboratory of Ministry of Education for Coastal Disaster and Protection Hohai UniversityNanjing210098China Center for Numerical Simulation Software in Engineering and Sciences College of Mechanics and MaterialsHohai UniversityNanjing211100China Department of Fluid Dynamics and Thermodynamics Faculty of Mechanical EngineeringUniversity of LjubljanaLjubljana1000Slovenia Laboratory for Simulation of Materials and Processes Institute of Metals and TechnologyLjubljana1000Slovenia School of Mathematics and Statistics Qingdao UniversityQingdaoShandong266071China College of Mechanical and Electrical Engineering National Engineering Research Center for Intelligent Electrical Vehicle Power SystemQingdao UniversityQingdao266071China

This paper presents a summary of various localized collocation schemes and their engineering *** basic concepts of localized collocation methods(LCMs)are first introduced,such as approximation theory,semianalytical collocation methods and localization *** on these basic concepts,five different formulations of localized collocation methods are introduced,including the localized radial basis function collocation method(LRBFCM)and the generalized finite difference method(GFDM),the localized method of fundamental solutions(LMFS),the localized radial Trefftz collocation method(LRTCM),and the localized collocation Trefftz method(LCTM).Then,several additional schemes,such as the generalized reciprocity method,Laplace and Fourier transformations,and Krylov deferred correction,are introduced to enable the application of the LCM to large-scale engineering and scientific computing for solving inhomogeneous,nonisotropic and time-dependent partial differential *** typical benchmark examples are presented to show the recent developments and applications on the LCM solution of some selected boundary value problems,such as numerical wave flume,potential-based inverse electrocardiography,wave propagation analysis and 2D phononic crystals,elasticity and in-plane crack problems,heat conduction problems in heterogeneous material and nonlinear time-dependent Burgers’***,some conclusions and outlooks of the LCMs are summarized.

关键词： Localization Collocation method Semianalytical Computational mechanics

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A Fast-Charging Cathode for Na-Ion Hybrid Supercapacitor

SSRN

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SSRN 2022年

作者： Liu, Zhaolu Cao, Yongjie Zhang, Hao Xu, Jie Zhao, Deqiang Wang, Nan Cheng, Guangyu Zhou, Yirong Liu, Yao Zhang, Junxi Shanghai Key Laboratory of Materials Protection and Advanced Materials in Electric Power Shanghai University of Electric Power Shanghai200090 China Department of Chemistry Shanghai Key Laboratory of Molecular Catalysis and Innovative Materials Fudan University Shanghai200433 China Key Laboratory of Hydraulic and Waterway Engineering National Engineering Research Center for Inland Waterway Regulation School of River & Ocean Engineering Chongqing Jiaotong University Chongqing400074 China Power & Energy Storage Battery System Engineering Tech. Co. Ltd. Shanghai200241 China Shanghai Aowei Technology Development Co. Ltd. Shanghai200241 China

Iron-based phosphate (Na 3 Fe 2 (PO 4 )P 2 O 7 ) cathode have been regarded as a potential cathode for sodium-ion batteries (SIBs), but the poor-rate capability restricts their fast charging performance. In this work, we have synthesized a mesoporous Na 3 Fe 2 (PO 4 )P 2 O 7 (M-NFPP) material and employed them in rechargeable sodium-ion batteries. The mesopores are produced by the decomposition carbonization of polyvinyl alcohol, which enlarges reactive sites and accelerates Na ion migration. As a result, the reversible specific capacity maintains at 81 mAh g - 1 (72.5% of 0.1 C reversible specific capacity) under an ultra-high C-rate of 40 C (equal to 1.5 mins), and than 1000 cycles life. A Na-ion hybrid supercapacitor using M-NFPP as cathode and active carbon as an anode can achieve a maximum energy and power density of 48 Wh kg - 1 and 1350 W kg - 1 with a capacity retention rate of 92% after 500 cycles at 20 C. © 2022, The Authors. All rights reserved.

关键词： Sol-gels

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dynamic Test for DC Training Emulation system with Back-to-back MMC

Dynamic Test for DC Training Emulation System with Back-to-b...

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2019 IEEE Sustainable power and Energy Conference, iSPEC 2019

作者： Yang, Zaixin Xing, Lixin Yin, Baiqing Wang, Yunmin Wang, Yuqiang Gao, Chen Inner Mongolia Electric Power Science and Research Institute Enterprise Key Laboratory of Smart Grid Simulation of Electrical Power System Institute of Relay Protection Hohhot China

ISBN: (纸本)9781728149301

With the development of VSC-HVDC and engineering applications, establishing a modular multilevel converter (MMC) platform is extremely important for simulation research and training. In this study, a back-to-back MMC emulation system with a converter station level is developed. dynamic tests are performed to verify the stability performance and the dynamic performance of the respective physical devices under asynchronous interconnection conditions. The results show that the system can perform automatic control for the sequence of blocking, uncontrolled charging, controlled charging, and unlocking operations. A remarkable power quality effect is obtained by using a controller for circulating current suppressing (CCS). Using a visual station operation interface, the dynamic index of the power step test is found to conform to the test standard, and the system exhibits stable operation. © 2019 IEEE.

关键词： Simulation platform

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Coordinate dispatch of combined heat and power system based on approximate dynamic programming 4

Coordinate dispatch of combined heat and power system based ...

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4th IEEE Conference on Energy Internet and Energy system Integration, EI2 2020

作者： Hu, Bo Liu, Ding Zang, Chuanzhi Wang, Yue Li, Wanting Liu, Yuqi Zeng, Peng State Grid Liaoning Electric Power Co. Ltd. Liaoning Shenyang China Shenyang Institute of Automation Chinese Academy of Sciences Key Laboratory of Networked Control System Liaoning Shenyang China Chinese Academy of Sciences University Beijing China Technical Service Center Shenyang Liaoning Lightning Protection Liaoning China

ISBN: (纸本)9781728196060

Combined heat and power (CHP) can simultaneously produce electrical and thermal energy. CHP is an important and main component of the power system in areas with heat demand. However, its operating mode limits the flexibility of the system and aggravates the waste of renewable energy. This paper presents a coordinate dispatch algorithm for electric heating integrated energy system (EHIES), a combined heat and power system with wind power. An efficient optimization algorithm based on dynamic programming (DP) is developed, which overcomes the challenges of solving high dimensional optimization problems for the EHIES. The results of simulation experiments show that the proposed coordinate dispatch algorithm can meet the scheduling time requirements, reduce the operating cost of the system and realize the full consumption of wind power. © 2020 IEEE.

关键词： Wind power

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Emissions reduction potential and feasibility of vehicle-to-grid for Beijing’s future electric vehicles

Cell Reports Physical Science

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Cell Reports Physical Science 2025年

作者： Jiaxin Xu Jiahui Chen Hongyi Wei Yinan Zhao Bowen Tian Yifan Wen Haiyang Jiang Ning Zhang Shaojun Zhang Ye Wu School of Environment Tsinghua University Beijing 100084 China Center for Sustainable Systems School for Environment and Sustainability University of Michigan Ann Arbor MI 48109 USA School of Electrical and Power Engineering Power System Research Institute Tsinghua University Beijing 100084 China State Environmental Protection Key Laboratory of Sources and Control of Air Pollution Complex Beijing 100084 China Beijing Laboratory of Environmental Frontier Technologies School of Environment Tsinghua University Beijing 100084 China State Key Laboratory of Regional Environment and Sustainability Tsinghua University Beijing 100084 China

Electric vehicles (EVs) offer significant potential to reduce greenhouse gas (GHG) emissions from road transport. However, nighttime charging increases peak demand and thermal power reliance. This study evaluates vehicle-to-grid (V2G) as a solution by integrating GPS-based EV travel data with hourly grid modeling for 2 million EVs in Beijing. Results show V2G boosts renewable energy use in charging to 66%, up from under 4% in uncoordinated charging. V2G cuts vehicle uncoordinated charging emissions by 20.6% and reduces the grid’s GHG footprint by replacing thermal power with discharging electricity. Commuter vehicles and the summer months offer the highest V2G emissions reduction potential. The study finds battery degradation manageable and highlights synergies between V2G, renewable capacity expansion, and economic incentives, while emphasizing the need for robust infrastructure and local grid networks to support large-scale EV adoption. This approach therefore offers a promising pathway to accelerate sustainable energy solutions amid increasing vehicle electrification and renewable integration.

关键词： electric vehicles vehicle to grid V2G GHG emissions travel pattern grid optimization

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A post-treatment to reduce stress concentration sensitivity under intermediate-temperature fatigue in GH4169: High-energy impact composite modification

Transactions of Materials Research

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Transactions of Materials Research 2025年第3期1卷

作者： Guoxin Lu Qiang Wang Bonnie Attard Arif Rochman Guofang Zhang Luqing Cui Zhong Ji Glenn Cassar MOE Key Laboratory for Liquid-Solid Structural Evolution and Processing of Materials Shandong University Jinan 250061 China Aviation Key Laboratory of Science and Technology on Advanced Corrosion and Protection for Aviation Material AECC Beijing Institute of Aeronautical Materials Beijing 100095 China Department of Metallurgy and Materials Engineering University of Malta MSD 2080 Malta Institute of Engineering and Transport The Malta College of Arts Science & Technology PLA 9032 Malta National Key Lab of Aerospace Power System and Plasma Technology Xi’an Jiaotong University Xi’an 710049 China

The study focuses on a novel post-treatment method, high-energy impact composite modification, combining mechanical shot peening and laser shock processing to improve the fatigue performance of the nickel-based superalloy GH4169 at intermediate temperatures. The synergistic interaction between mechanical impact (SP-induced plastic deformation) and laser-induced shock waves enabled a 2.5-fold increase in effective treatment depth (up to 1500 μm) compared to SP alone (400 μm), while achieving a surface hardness of 520 HV and compressive residual stress of −1465 MPa, exceeding single-process results by 4.5% and 54.2%, respectively. The dual-impact approach significantly enhanced surface hardness and compressive residual stress, addressing the high sensitivity to stress concentration. Experimental results demonstrate that HEICM eliminated stress concentration sensitivity at 650 °C, elevating the fatigue limit of notched specimens (Kt = 3) to 638 MPa – equivalent to the fatigue strength of smooth specimens (Kt = 1) in conventional grinding states (636 MPa). This represents a 116% improvement over untreated notched specimens (295 MPa) and surpasses SP-treated counterparts (446 MPa) by 43%, thereby extending the fatigue life of GH4169 alloys in aerospace applications.

关键词： Composite modification Shot peening Surface strengthening Superalloy High-cycle fatigue

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Comparison of corrosion resistance of MgAl-LDH and ZnAl-LDH films intercalated with organic anions ASP on AZ31 Mg alloys

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Transactions of Nonferrous Metals Society of China 2020年第9期30卷 2424-2434页

作者： Jia-ling CHEN Liang FANG Fang WU Xian-guang ZENG Jia HU Shu-fang ZHANG Bin JIANG Hai-jun LUO Chongqing Key Laboratory of Soft Condensed Matter Physics and Smart Materials State Key Laboratory of Power Transmission Equipment&System Safety and New TechnologyCollege of PhysicsChongqing UniversityChongqing 400044China Material Corrosion and Protection Key Laboratory of Sichuan Province Institute of Materials Science and EngineeringSichuan University of Science and EngineeringZigong 643000China National Engineering Research Center for Magnesium Alloys College of Materials Science and EngineeringChongqing UniversityChongqing 400044China College of Software Chongqing College of Electronic EngineeringChongqing 401331China Chongqing Key Laboratory on Optoelectronic Functional Materials College of Physics and Electronic EngineeringChongqing Normal UniversityChongqing 401331China

The aspartic acid(ASP),an environment-friendly corrosion inhibitor,was explored to intercalate into the ZnAl-layered double hydroxide(ZnAl-LDH)and MgAl-LDH coatings on AZ31 magnesium alloys by a facile one-step hydrothermal *** morphology,composition,structure and corrosion resistance of the prepared coatings were comparatively *** is found that the uniform and dense layered nanosheet(NS)vertically grows on the substrate,and the MgAl−ASP-LDH films exhibit a three-dimensional(3D)rose-like sheet structure with high ratio of pore *** MgAl−ASP-LDH coating exhibits better corrosion resistance and durability of longtime immersion than ZnAl−ASP-LDH *** corrosion current density of two coatings is two or three orders of magnitude lower than that of bare Mg alloy,indicating that ZnAl/MgAl-LDH films intercalated with organic ASP anions can significantly improve the corrosion resistance of Mg alloy.

关键词： hydrotalcite magnesium alloy aspartic acid corrosion resistance corrosion inhibitor

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dynamic Test for DC Training Emulation system with Back-to-back MMC

Dynamic Test for DC Training Emulation System with Back-to-b...

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Sustainable power and Energy Conference (iSPEC)

作者： Zaixin Yang Lixin Xing Baiqing Yin Yunmin Wang Yuqiang Wang Chen Gao Enterprise Key Laboratory of Smart Grid Simulation of Electrical Power System Institute of Relay Protection Inner Mongolia Electric Power Science & Research Institute Hohhot China

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Approximation of Propagation Function of Transmission Lines Using Vector Fitting With Aid of a Hybrid Genetic Algorithm and Differential Evolution Algorithm

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IOP Conference Series: Earth and Environmental Science 2021年第1期657卷

作者： Y. Yu Y.J. Li D.H. Wang Q.Y. Ge C.Q. Jiao J.W. Sun State Key Laboratory of Power Grid Safety and Energy Conservation Relay Protection Research Department China Electric Power Research Institute Beijing 100192 China State Grid Zhejiang Electric Power Co. Ltd. Research Institute China State Key Laboratory of Alternate Electric Power System with Renewable Energy Sources North China Electric Power University Beijing 102206 China

Vector fitting is a powerful tool for function approximation. However, when it is adopted to approximate the propagation function of transmission lines, the number of poles and corresponding delay times need to be determined beforehand. The conventional determination method is inefficient. In this work, the parameters are determined by a hybrid genetic algorithm and differential evolution algorithm (HybGADE). The proposed approach can result in a better approximation of propagation function, which is proven by a successful implementation to an overhead single core coaxial cable.

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