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Optimizing Polynomial-Time Solutions to a Network Weighted Vertex Cover Game

IEEE/CAA Journal of Automatica Sinica 2023年第2期10卷 512-523页

作者： Jie Chen Kaiyi Luo Changbing Tang zhao Zhang Xiang Li the Adaptive Networks and Control Laboratory Department of Electronic EngineeringFudan UniversityShanghai 200433China the College of Mathematics and Computer Science Zhejiang Normal UniversityJinhua 321004 Yuxi Middle School Taizhou 317399China IEEE the College of Physics and Electronics Information engineering Zhejiang Normal UniversityJinhua 321004China the College of Mathematics and Computer Science Zhejiang Normal UniversityJinhua 321004China the Adaptive Networks and Control Laboratory Department of Electronic EngineeringFudan UniversityShanghai 200433 the institute of Complex Networks and Intelligent Systems Shanghai Research Institute for Intelligent Autonomous SystemsTongji UniversityShanghai 201210China

Weighted vertex cover(WVC)is one of the most important combinatorial optimization *** this paper,we provide a new game optimization to achieve efficiency and time of solutions for the WVC problem of weighted *** first model the WVC problem as a general game on weighted *** the framework of a game,we newly define several cover states to describe the WVC ***,we reveal the relationship among these cover states of the weighted network and the strict Nash equilibriums(SNEs)of the ***,we propose a game-based asynchronous algorithm(GAA),which can theoretically guarantee that all cover states of vertices converging in an SNE with polynomial ***,we improve the GAA by adding 2-hop and 3-hop adjustment mechanisms,termed the improved game-based asynchronous algorithm(IGAA),in which we prove that it can obtain a better solution to the WVC problem than using a the ***,numerical simulations demonstrate that the proposed IGAA can obtain a better approximate solution in promising computation time compared with the existing representative algorithms.

关键词： Game-based asynchronous algorithm(GAA) game optimization polynomial time strict Nash equilibrium(SNE) weighted vertex cover(WVC)

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Variational Wavelet Ensemble Empirical(VWEE)Denoising Method for Electromagnetic Ultrasonic Signal in High‑Temperature Environment with Low‑Voltage Excitation

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Chinese Journal of Mechanical engineering 2022年第6期35卷 312-325页

作者： Jinjie Zhou Shuaijie zhao Yang Zheng Xingquan Shen Jitang Zhang School of Mechanical engineering North University of ChinaTaiyuan 030051China china Special Equipment Inspection and Research institute Beijing 100029China

Low excitation voltage for an electromagnetic acoustic transducer(EMAT)is necessary for the petrochemical equipment and facilities inspection,which work at high-temperatures,to avoid potential ***,low excitation voltage causes low signal-to-noise ratio(SNR)signals that are difficult to extract features,especially in a high-temperature environment,which causes high *** this study,a denoising method called the variational wavelet ensemble empirical(VWEE)method was proposed by combining the advantages of the variational modal decomposition(VMD),wavelet threshold(WT)denoising,and ensemble empirical mode decomposition(EEMD)*** validate the VWEE method,EMAT signals obtained in the temperature range of 25 to 700°C were *** results show that,compared with VMD,WT and empirical mode decomposition denoising methods,the SNR of proposed method is improved more than two *** VWEE method dramatically improved the SNR of a high-temperature EMAT signal and enhanced the accuracy of defect echos extraction.

关键词： EMAT High temperature Low excitation voltage SNR

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Comparative adsorption of heavy metal ions in wastewater on monolayer molybdenum disulfide

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Green Energy & Environment 2021年第5期6卷 751-758页

作者： Zheng Zhang Kai Chen Qiang zhao Mei Huang Xiaoping Ouyang Beijing Key Laboratory of Passive Safety technology for Nuclear Energy North China Electric Power UniversityBeijing102206China School of Nuclear Science and engineering North China Electric Power UniversityBeijing102206China Northwest institute of Nuclear technology Xi'an710024China School of Materials Science and engineering Xiangtan UniversityXiangtan411105China

To maximize the potential of monolayer molybdenum disulfide(MoS2)sheet in the disposal of heavy metal ions in wastewater,we compared the adsorption of several common heavy metal ions(including Cr^(3+),Ni^(2+),Cu^(2+),Zn^(2+),Cd^(2+),Hg^(2+),and Pb^(2+))in wastewater on the monolayer MoS2 sheet through first-principles *** simulation results show that the monolayer MoS2 sheet is a potential heavy metal adsorption material because of the attractive interaction between *** most negative adsorption energy determines that the TMo site is the most stable adsorption site for the heavy metal *** attractive interaction is considered as chemical adsorption,and it is closely related to charge *** orbital hybridization between S p and heavy metal ions p and d states electrons contributes to the adsorption,except the orbital hybridization between S p and Pb p states electrons contributes to the Pb^(2+) *** the results show that the monolayer MoS2 sheet is most suitable for removing Ni^(2+) and Cr^(3+) ions from wastewater,followed by Cu^(2+) and Pb^(2+).For the ions Cd^(2+),Zn^(2+),and Hg^(2+),its adsorption strength remains to be improved.

关键词： Monolayer MoS2 Heavy metal ions Adsorption Wastewater First-principles calculation

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An overview of functional biolubricants

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Friction 2023年第1期11卷 23-47页

作者： Lumin YANG Xiaoduo zhao Zhengfeng MA Shuanhong MA Feng ZHOU State Key Laboratory of Solid Lubrication Lanzhou Institute of Chemical PhysicsChinese Academy of SciencesLanzhou 730000China Center of Materials Science and Optoelectronics Enginering University of Chinese Academy of SciencesBeijing 100049China Yantai Zhongke Research institute of Advanced Materials and Green Chemical engineering Yantai 264006China Shandong Laboratory of Yantai Advanced Materials and Green Manufacture Yantai 264006China

At present,more and more diseases are associated with the lubrication dysfunction,which requires a systematic study of the complex lubrication behavior of tissues and organs in human *** biomacromolecular lubricants are essential for maintaining ultra-low coefficients of friction between sliding biological ***,when the surface lubrication performance of tissues or organs destroys heavily,it will bring friction/shear damage for sliding contact ***,the application of exogenous biological lubricating materials to improve the lubrication situation of damaged tissue or organ interfaces has attracted extensive attention of *** this review,based on a simple summary of lubrication mechanism at sliding biological interface,we systematically introduce the research progress of several kinds of representatively biolubrication materials,including eye drops,tissue anti-adhesion agents,joint lubricants,and medical device ***,the lubrication mechanism and individual advantage and shortcoming for each of these synthetic exogenous lubricated materials are ***,the important lubrication application functionality of these biolubricant materials in typically medical surgery scenes,such as dry eye syndrome,tissue adhesion,arthritis,and interventional medical devices,is ***,we look forward to the future development direction of artificial biolubricant materials.

关键词： biolubricants eye drops tissue anti-adhesion arthritis treatment medical devices

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航空发动机燃油阶跃试验供油规律

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沈阳航空航天大学学报 2024年第1期41卷 18-26页

作者：赵红娇韩文俊李俊中国航发沈阳发动机研究所总体五部沈阳110015

为了分析燃油阶跃逼喘试验中供油规律对发动机的影响,以小涵道比混合排气涡扇发动机为研究对象,将发动机模化为典型的基本部件组成的系统,构建考虑转子动力学方程及容积效应的平衡方程。对发动机燃油阶跃逼喘过程进行仿真,理论计算结果... 详细信息

为了分析燃油阶跃逼喘试验中供油规律对发动机的影响,以小涵道比混合排气涡扇发动机为研究对象,将发动机模化为典型的基本部件组成的系统,构建考虑转子动力学方程及容积效应的平衡方程。对发动机燃油阶跃逼喘过程进行仿真,理论计算结果与试验数据误差在4%以内,验证了计算方法的准确性。通过仿真获取了阶跃供油规律的关键影响因素,仿真结果能够为发动机燃油阶跃试验的试验提供理论基础,降低发动机在燃油阶跃逼喘过程中的超温、超转风险,具有一定的工程意义。

关键词：航空发动机喘振边界过渡态仿真燃油阶跃试验供油规律

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Nickel embedded porous macrocellular carbon derived from popcorn as sulfur host for high-performance lithium-sulfur batteries

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Journal of Materials Science & technology 2021年第15期74卷 69-77页

作者： Wenjuan Wang Yan zhao Yongguang Zhang Ning Liu Zhumabay Bakenov School of Materials Science and engineering Hebei University of TechnologyTianjin 300130China institute of Batteries LLC School of Engineering and Digital SciencesNational Laboratory AstanaNazarbayev University53 Kabanbay Batyr AvenueNur-Sultan 010000Kazakhstan

Due to the demands for high performance and ecological and economical alternatives to conventional lithium-ion batteries(Li Bs),the development of lithium-sulfur(Li-S)batteries with remarkably higher theoretical capacity(1675 m A h g-1)has become one of the extensive research focus directions ***,poor conductivity of sulfur,critical cyclability problems due to shuttle of polysulfides as intermediate products of the cathodic reaction,and large volume variation of the sulfur composite cathode upon operation are the major bottlenecks impeding the implementation of the next-generation Li-S *** this work,a unique three-dimensional(3D)interconnected macrocellular porous carbon(PC)architecture decorated with metal Ni nanoparticles was synthesized by a simple and facile *** as-fabricated Ni/PC composite combines the merits of conducting carbon skeleton and highly adsorptive abilities of Ni,which resulted in efficient trapping of lithium polysulfides(Li PSs)and their fast conversion in the electrochemical *** to these synergistic advantageous features,the composite exhibited good cycling stability(512.3 mA h g^(-1)after 1000 cycles at 1 C with an extremely low capacity fading rate 0.03%per cycle),and superior rate capability(747.5 mA h g^(-1)at 2 C).Accordingly,such Ni nanoparticles embedded in a renewable puffed corn-derived carbon prepared via a simple and effective route represent a promising active type of sulfur host matrix to fabricate high-performance Li-S batteries.

关键词： Biomass-derived porous carbons Cathodes Lithium-sulfur batteries Ni nanoparticles

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Partially-Premixed Combustion Characteristics and Thermal Performance of Micro Jet Array Burners with Different Nozzle Spacings

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Journal of Thermal Science 2021年第5期30卷 1718-1730页

作者： YANG Haolin WU Yong ZENG Xiaojun WANG Xiaohan zhao Daiqing Guangzhou institute of Energy Conversion Chinese Academy of SciencesGuangzhou510640China Department of Energy and Mechanical engineering Hunan University of HumanitiesScience and TechnologyLoudi417000China Key Laboratory of Renewable Energy Chinese Academy of SciencesGuangzhou510640China Guangdong Provincial Key Laboratory of New and Renewable Energy Research and Development Guangzhou510640China Guangdong institute of Special Equipment Inspection and Research Shunde Branch Foshan528300China

In order to develop a burner with uniform temperature field,the combustion characteristics and thermal performance of partially premixed methane/air jet flames were experimentally studied by using micro jet array *** circular tubes of 1.0-mm inner diameter and 1.5-mm outer diameter were used as *** effects of nozzle spacing and equivalence ratio on flame phenomenology,temperature distribution and pollutant emissions were respectively investigated by camera photography,thermocouple measurement and sampling *** show that there are two clean flame patterns:clean merged-flame and clean non-merging *** flame patterns depend on the strength of flame interaction,the equivalence ratio of the mixture and the quantity of air entrainment through the gap between *** burners with small nozzle spacing such as 2 mm and 2.5 mm tend to produce fully merged flame with low equivalence ratio limit and the corresponding temperature fields are very uniform with fluctuations less than 0.3%,but a small increase in equivalence ratio will lead to rapid deterioration of combustion *** burner with a medium spacing of 3 mm can produce partially merged flame in a wide equivalence ratio range with low emissions,and the temperature fluctuation can be less than 0.5%(<7 K)in the optimal *** burner with a large spacing of 4 mm will basically form independent array flames with the largest temperature fluctuation over 1%,while it can achieve clean combustion under high equivalence ratio due to large air *** analysis shows that the micro jet array burner with medium nozzle spacing of 3 mm has the best combustion characteristics and thermal performance.

关键词： micro jet array burner flame interaction methane/air flame temperature fluctuation thermal performance

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An efficient hyper-elastic model for the preforming simulation of Carbon-Kevlar hybrid woven reinforcement

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Chinese Journal of Aeronautics 2022年第12期35卷 321-335页

作者： Sasa GAO Zhengtao QU Yunjie ZHANG Zizhao zhao Biao LIANG College of Mechanical&Electrical engineering Shaanxi University of Science&TechnologyXi’an 710021China State Key Laboratory of Applied Optics Changchun Institute of OpticsFine Mechanics and PhysicsChinese Academy of SciencesChangchun 130033China School of Mechanical engineering Northwestern Polytechnical UniversityXi’an 710072China

An efficient hyper-elastic model that can reflect the primary mechanical behaviors of Carbon-Kevlar hybrid woven reinforcement was developed and implemented with VUMAT constitutive code for preforming *** model parameters were accurately determined through the uniaxial and bias-extension *** calibrate the simulation code,preforming experiments of hybrid woven reinforcement over the hemisphere mold and tetrahedron mold were respectively conducted to validate the proposed hyper-elastic *** comparison between the simulations and experiments shows that the model can not only accurately capture shear angle distribution and geometry shape after deformation,but also accurately predict the force–displacement curve and potential fiber tensile failure during the preforming *** result indicates that the proposed model can be used to predict the preforming behavior of Carbon-Kevlar hybrid woven reinforcement,and simulate its manufacturing process of complicated geometry.

关键词： Constitutive law Finite element analysis Hybrid woven reinforcement Hyper-elastic Preforming

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大气压氦气预电离直流辉光放电二维仿真研究

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物理学报 2024年第1期73卷 227-240页

作者：刘在浩刘颖华许博坪尹培琪李静王屹山赵卫段忆翔汤洁中国科学院西安光学精密机械研究所瞬态光学与光子技术重点实验室西安710119 中国科学院大学北京100049 淮阴工学院数理学院淮安223003 四川大学机械工程学院分析仪器研究中心成都610064

基于二维流体模型,研究了大气压下预电离对短间隙和长间隙直流辉光放电的影响.对于两种放电,随着预电离的增强,带电粒子分布沿着放电方向逐渐向阴极偏移,使得阴极位降区不断收缩.从垂直放电方向来看,正柱区、负辉区和阴极位降区的宽度... 详细信息

基于二维流体模型,研究了大气压下预电离对短间隙和长间隙直流辉光放电的影响.对于两种放电,随着预电离的增强,带电粒子分布沿着放电方向逐渐向阴极偏移,使得阴极位降区不断收缩.从垂直放电方向来看,正柱区、负辉区和阴极位降区的宽度都不断增大,电子、离子密度的分布更加均匀.对于电场而言,随着预电离的增强,阴极位降区电场的纵向分量分布逐渐向阴极收缩,阴极附近的电场整体降低且分布更加均匀.电场的纵向分量分布逐渐减小,同时电场区域逐渐向壁面收缩.维持电压和放电功率都明显地降低.此外,随预电离的增加,短间隙放电中的压降始终集中在阴极位降区,而在长间隙放电中的压降由阴极位降区逐渐转移至正柱区.仿真结果表明,预电离能够有效增强放电均匀性,并降低放电维持电压和能量消耗.该工作对进一步优化电极配置和等离子体源的运行参数具有重要指导意义.

关键词：预电离流体模型直流辉光放电

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Displacement and force analyses of piles in the pile-caisson composite structure under eccentric inclined loading considering different stratum features

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Frontiers of Structural and Civil engineering 2023年第10期17卷 1517-1534页

作者： Xiaoqing zhao Jinchang WANG Panpan GUO Xiaonan GONG Yongle DUAN Research Center of Coastal and Urban Geotechnical engineering Zhejiang UniversityHangzhou 310058China institute of Transportation engineering Zhejiang UniversityHangzhou 310058China College of Civil engineering Hefei University of TechnologyHefei 230009China china North Industries Norengeo Ltd. Shijiazhuang 050051China

A novel anchorage for long-span suspension bridges,called pile-caisson composite structures,was recently proposed by the authors in an attempt to reduce the construction period and *** study aims to investigate the displacement and force behavior of piles in a pile-caisson composite structure under eccentric inclined loading considering different stratum *** this end,both 1g model tests and three-dimensional numerical simulations were *** groups of 1g model tests were used to validate the finite-element(FE)*** studies were then performed to investigate the effects of groundwater level,burial depth of the pile-caisson composite structure,and distribution of soil layers on the performance of the pile-caisson composite *** numerical analyses indicated that the influence of the groundwater level on the stability of the caisson was much greater than that of the *** addition,increasing the burial depth of the pile-caisson composite structure can assist in reducing the displacements and improving the stability of the pile-caisson composite *** addition,the distribution of soil layers can significantly affect the stability of the pile-caisson composite structure,especially the soil layer around the caisson.

关键词： composite structure piles foundation suspension bridge 1g model test finite-element analysis

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