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Machine learning and neural network supported state of health simulation and forecasting model for lithium-ion battery

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Frontiers in Energy 2024年第2期18卷 223-240页

作者： Nan qi Kang YAN Yajuan YU Rui LI Rong HUANG Lai CHEN Yuefeng SU Beijing Institute of Technology Chongqing Innovation Center Chongqing 401120China Department of Energy and Environmental Materials School of Materials Science and EngineeringBeijing Institute of TechnologyBeijing 100081China Beijing Electric Vehicle Co. Ltd.Beijing 100176China

As the intersection of disciplines deepens,the field of battery modeling is increasingly employing various artificial intelligence(AI)approaches to improve the efficiency of battery management and enhance the stability and reliability of battery *** paper reviews the value of AI methods in lithium-ion battery health management and in particular analyses the application of machine learning(ML),one of the many branches of AI,to lithium-ion battery state of health(SOH),focusing on the advantages and strengths of neural network(NN)methods in ML for lithium-ion battery SOH simulation and *** is one of the important branches of ML,in which the application of NNs such as backpropagation NN,convolutional NN,and long short-term memory NN in SOH estimation of lithium-ion batteries has received wide *** so far have shown that the utilization of NN to model the SOH of lithium-ion batteries has the advantages of high efficiency,low energy consumption,high robustness,and scalable *** the future,NN can make a greater contribution to lithium-ion battery management by,first,utilizing more field data to play a more practical role in health feature screening and model building,and second,by enhancing the intelligent screening and combination of battery parameters to characterize the actual lithium-ion battery SOH to a greater *** in-depth application of NN in lithium-ion battery SOH will certainly further enhance the science,reliability,stability,and robustness of lithium-ion battery management.

关键词： machine learning lithium-ion battery state of health neural network artificial intelligence

Full-scale site evaluation of ventilation expressway embankments underlain by warm permafrost along the Gonghe−Yushu Expressway

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Frontiers of Structural and Civil Engineering 2023年第7期17卷 1047-1059页

作者： Shuangjie WANG qi ZHANG Yuanhong DONG Kun YUAN Binhua HU Huilong ZHAO Nanlu ZHAO CCCC First Highway Consultants Co. Ltd.Xi’an 710065China State Key Laboratory of Road Engineering Safety and Health in Cold and High-Altitude Regions Xi’an 710065China qinghai Huashixia Permafrost Highway Engineering Safety National Observation and Research Station Xi’an 710065China

Ventilation embankments,including those with forced ventilation,natural ventilation,and combination of these,were adopted for the construction of the Gonghe−Yushu Expressway in warm permafrost *** evaluate the actual thermal performance of ventilation embankment in the qinghai−Tibet Plateau,four types of ventilation embankments were selected as objects,and their long-term thermal characteristics were analyzed based on monitoring *** was found that:1)under the strong scale effect of a wide embankment,the crushed-rock embankment(CRE)was warming up and the permafrost table was declining year by ***,the combined ventilated slab and CRE and ventilated ducts embankment can effectively decrease the ground temperature and raise permafrost table in the year with a colder winter;2)transverse temperature difference caused by the shady–sunny slope effect existed in all the four ***,it was weakened by the combined ventilated slab and CRE and the ventilated ducts embankment due to their stronger cooling effect;and 3)the pre-existing embankment had a remarkable thermal disturbance to the adjacent newly-built embankment,so a reasonable embankment spacing should be considered in practical *** findings would provide a reference for construction of expressway embankments in permafrost regions.

关键词： warm permafrost expressway ventilation embankments temperature field

Intelligent service function chain mapping framework for cloud-and-edge-collaborative IoT

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The Journal of China Universities of Posts and Telecommunications 2022年第3期29卷 54-68,104页

作者： Yang Chao Li Yimin Li Tong Xu Siya qi Jun Zhang Yu Information and Communication Branch State Grid Liaoning Electric Power Co.Ltd.Shenyang 110004China State Key Laboratory of Networking and Switching Technology Beijing University of Postsand TelecommunicationsBeijing 100876China State Grid Liaoning Electric Power Research Institute Shenyang 110004China

With the rapid development of Internet of thing(IoT) technology, it has become a challenge to deal with the increasing number and diverse requirements of IoT services. By combining burgeoning network function virtualization(NFV) technology with cloud computing and mobile edge computing(MEC), an NFV-enabled cloud-and-edge-collaborative IoT(CECIoT) architecture can efficiently provide flexible service for IoT traffic in the form of a service function chain(SFC) by jointly utilizing edge and cloud resources. In this promising architecture, a difficult issue is how to balance the consumption of resource and energy in SFC mapping. To overcome this challenge, an intelligent energy-and-resource-balanced SFC mapping scheme is designed in this paper. It takes the comprehensive deployment consumption as the optimization goal, and applies a deep Q-learning(DQL)-based SFC mapping(DQLBM) algorithm as well as an energy-based topology adjustment(EBTA) strategy to make efficient use of the limited network resources, while satisfying the delay requirement of users. Simulation results show that the proposed scheme can decrease service delay, as well as energy and resource consumption.

关键词： Internet of thing(IoT) mobile edge computing network function virtualization(NFV) deep Q-learning(DQL)

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Blind Recognition of Non-Binary LDPC Codes Based on Ant Colony Optimization

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China Communications 2024年第10期21卷 59-69页

作者： Guan Mengsheng Gao Wanting Chen qi Zhu Min Bai Baoming State Key Laboratory of Integrated Services Networks Xidian UniversityXi'an 710071China

This paper introduces a novel blind recognition of non-binary low-density parity-check(LDPC)codes without a candidate set,using ant colony optimization(ACO)algorithm over additive white Gaussian noise(AWGN)***,the scheme that effectively combines the ACO algorithm and the non-binary elements over finite fields is ***,an improved,simplified elitist ACO algorithm based on soft decision reliability is introduced to recognize the parity-check matrix over noisy *** results show that the recognition rate continuously increases with an increased signalto-noise ratio(SNR)over the AWGN channel.

关键词： ACO blind recognition non-binary LDPC codes open-set

Coordinated grain boundary deformation governed nanograin annihilation in shear cycling

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Journal of Materials Science & Technology 2021年第27期86卷 180-191页

作者： Yingbin Chen qishan Huang qi Zhu Kexing Song Yanjun Zhou Haofei Zhou Jiangwei Wang Center of Electron Microscopy and State Key Laboratory of Silicon Materials School of Materials Science and EngineeringZhejiang UniversityHangzhou310027PR China Center for X-Mechanics Department of Engineering MechanicsZhejiang UniversityHangzhou310027PR China School of Materials Science&Engineering Henan University of Science and TechnologyLuoyang471023PR China

Grain growth and shrinkage are essential to the thermal and mechanical stability of nanocrystalline metals,which are assumed to be governed by the coordinated deformation between neighboring grain boundaries(GBs)in the nanosized ***,the dynamics of such coordination has rarely been reported,especially in *** this work,we systematically investigate the atomistic mechanism of coordinated GB deformation during grain shrinkage in an Au nanocrystal film through combined stateof-the-art in situ shear testing and atomistic *** demonstrate that an embedded nanograin experiences shrinkage and eventually annihilation during a typical shear loading *** continuous grain shrinkage is accommodated by the coordinated evolution of the surrounding GB network via dislocation-mediated migration,while the final grain annihilation proceeds through the sequential dislocation-annihilation-induced grain rotation and merging of opposite *** experiments and simulations show that stress distribution and GB structure play important roles in the coordinated deformation of different GBs and control the grain shrinkage/annihilation under shear *** findings establish a mechanistic relation between coordinated GB deformation and grain shrinkage,which reveals a general deformation phenomenon in nanocrystalline metals and enriches our understanding on the atomistic origin of structural stability in nanocrystalline metals under mechanical loading.

关键词： Nanocrystalline metals Grain shrinkage and annihilation Grain boundary migration Grain rotation Coordinated deformation

Velocity and turbulence characteristics in an open channel with multi-row staggered vegetation patches

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Journal of Hydrodynamics 2021年第5期33卷 1035-1044页

作者： Hong-sheng Fu Dan Wang Wen-qi Li Bao-liang Ren Ke-jun Yang State Key Laboratory of Hydraulics and Mountain River Engineering Sichuan UniversityChengdu 610065China

A staggered distribution of vegetation is very common in nature,which might significantly affect the flow *** investigate its impact,three rows of staggered vegetation groups are designed under seven different working *** horizontal and vertical distances between the vegetation groups are constant,while the vegetation density is *** flow field is measured by the acoustic Doppler velocimeter(ADV).It is indicated that both the patch exit velocity and the steady wake velocity decrease with the increase of the density,which is also related to the vegetation *** for the first patch,the upstream adjustment regions of all patches are diminished to some extent,due to the effect of the contralateral *** steady wake region also shows a decreasing trend,with a reduction of 0.5D each time when the water flows through the *** means that the flow structure is also affected by the number of vegetation *** intensity of the turbulence increases along the channel and has a non-axisymmetric distribution similar to that of the *** Karman vortex street generated by the patches on the same side would merge into a larger vortex *** on its intensity,the vegetation at the back has different effects on the vortex street.

关键词： Velocity turbulence intensity staggered vegetation patches Karman vortex street open channel

Antibacterial activities against Porphyromonas gingivalis and biological characteristics of copper-bearing PEO coatings on magnesium

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Journal of Materials Science & Technology 2021年第2期61卷 33-45页

作者： Dan Zhang qi Han Kun Yu Xiaopeng Lu Ying Liu Ze Lu qiang Wang School and Hospital of Stomatology China Medical UniversityShenyang 110001China Liaoning Provincial Key Laboratory of Oral Diseases Shenyang 110001China Shenyang National Laboratory for Materials Science Northeastern UniversityShenyang 110819China College of Medicine and Biological Information Engineering Northeastern UniversityShenyang 110169China School of Stomatology Jiamusi UniversityJiamusi 154007China

Unlike other parts of the body, jaw defection often involves dental and periodontal tissues, which colonized a great many oral anaerobic bacteria. As a remarkable degradable material, magnesium has become an excellent candidate for orthopedic appliances recently. But the high degradation rate is still a big problem. Making a biodegradable coating with good biocompatibility to slow down the degeneration rate of magnesium is one of the best methods. However, protective coatings will impair the antibacterial effects of magnesium which is caused by the rise of p H value throughout its degradation. To solve this problem, a series of composite coatings with different amounts of Cu O particles(3, 5 and 7 wt.%) were fabricated on pure magnesium through plasma electrolytic oxidation(PEO) to investigate in vitro biocompatibility and the antibacterial abilities against Porphyromonas gingivalis(P. gingivalis). Surface characterization and degradation behavior of the copper-bearing PEO coatings were also systematically studied. Furthermore,the most optimum coating was also systematically studied by X-ray photoelectron spectroscopy(XPS)and electrochemical corrosion test. Results of the present research revealed that adding proper amount of Cu O into PEO coatings could greatly improve the antibacterial abilities of the PEO coatings. The antibacterial activities of copper-bearing PEO coatings were excellent and revealed concentration-dependent and time-dependent. Biocompatibility of copper-bearing PEO coatings showed that proper amount of Cu could promote cell proliferation. Compared with other PEO coatings in this study, PEO-7 Cu showed some inhibition effects on cell proliferation and adhesion for long-term use. Electrochemical corrosion tests and immersion tests showed that PEO-5 Cu and PEO-7 Cu copper-bearing PEO coatings would provide satisfying corrosion resistance effects, while PEO-3 Cu was poorer than PEO coatings without Cu. However, compared with uncoated pure magnesium,

关键词： Magnesium Copper Plasma electrolytic oxidation(PEO) Coating

Optimum Control Scheme of Output Voltage Based on Cascaded H-bridge DVR

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CSEE Journal of Power and Energy Systems 2020年第2期6卷 249-258页

作者： Fei Jiang Siju Cheng Chunming Tu qi Guo qing Li Cheng Chen School of Electrical and Information Engineering Changsha University of Science&TechnologyChangsha 410004China College of Electrical and Information Engineering Hunan UniversityChangsha 410082China Department of Engineering Sciences and Mathematics LuleåUniversity of TechnologyLuleå97187Sweden

This study presents an optimum control scheme to maximize the output voltage level number of the cascaded Hbridge dynamic voltage restorer(CHB–DVR).The relationship between the modulation index and the output voltage level number is analyzed in *** compensation reference voltage value is adjusted with the voltage drop depth to obtain high-quality output voltage with an acceptable total harmonic ***,the modulation index remains within a certain range and thus meets the requirements of the maximum level number technique(MLNT).In addition,an improvement method based on the MLNT is proposed to achieve minimum active power absorption from a direct current link of the CHB–*** traditional in-phase compensation and optimum control strategies are implemented to analyze the output voltage quality for verifying the feasibility of the proposed *** and experimental results show the effectiveness of the proposed control scheme.

关键词： Compensation scheme DC-link voltage dynamic voltage restorer harmonic distortion

Evolution of lmiRNAs and their targets from MITEs for rice adaptation

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Journal of Integrative Plant Biology 2022年第12期64卷 2411-2424页

作者： Tianxiao Huang Yan Li Wei Wang Le Xu Jingrui Li Yijun qi Center for Plant Biology School of Life SciencesTsinghua UniversityBeijing 100084China Tsinghua University.Peking University Joint Center for Life Sciences School of Life SciencesTsinghua UniversityBeijing 100084China

Twenty-four nucleotide long microRNAs(ImiRNAs)direct DNA methylation at target genes and regulate their *** evolutionary origin of ImiRNAs and the range of ImiRNA-mediated regulation remain ***,we reannotated ImiRNAs and their targets in rice by applying stringent *** found that the majority of ImiRNAs are derived from Miniature Inverted-repeat Transposable Elements(MITEs)and most sites targeted by MITE-derived ImiRNAs reside within MITEs,suggesting co-evolution of ImiRNAs and their targets through MITE *** undergo dynamically changes under stress conditions and the genes targeted by ImiRNAs show an enrichment for stress-responsive genes,suggesting that ImiRNAs are widely involved in plant responses to *** constructed the evolutionary histories of ImiRNAs and their *** half of ImiRNAs emerged before or when the AA genome was diverged,while the emergence of ImiRNA targets coincided with or followed the emergence of ***,we found that the sequences of a ImiRNA target site underwent variations,coincident with the divergence of rice accessions and the distribution of rice accessions in different geographical locations and climatic *** findings highlight MITEs as an important origin of ImiRNAs and suggest that the evolution of ImiRNA-target regulatory modules may contribute to rice adaptation to environmental changes.

关键词： DNA methylation evolution miRNA stress