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Existence and Regularity of Solution of the Liquid^(4)He Model Coupling with an Applied Magnetic Field

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Acta Mathematicae Applicatae Sinica 2022年第2期38卷 497-511页

作者： chen Peng College of Mathematics Sichuan UniversityChengdu 610065China

In this paper,we derive a time-dependent Ginzburg-Landau model for liquid^(4)He coupling with an applied magnetic field basing on the Le Chatlier principle.We also obtain the existence and uniqueness of global weak solution for this model.In addition,by utilizing the regularity estimates for linear semigroup,we prove that the model possesses a global classical solution.

关键词： Ginzburg-Landau model liquid^(4)He existence uniqueness regularity semigroup of operator

MPC-Based Change Management of Supply Chain Under Disruption Risks:The Case of Battery Industry

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IEEE/CAA Journal of Automatica Sinica 2023年第9期10卷 1896-1898页

作者： Yi Yang chen Peng School of Mechatronic Engineering and Automation Shanghai UniversityShanghai 200444China IEEE

Dear Editor,The health management of battery supply chain(SC)is vital to battery-related industry.This letter focuses on the study of health management of battery SC under disruptions.First,a discrete-time model of battery SC is developed based on the actual industrial process.Then,a model predictive control-based change management(MPCCM)strategy is proposed to ensure stable manufacturing of batteries.Moreover,the effects of disruption are also considered in terms of the actual situation.Finally,the validity of the proposed strategy is verified by a case study in Dongsheng Electronics Co.,Ltd.

关键词： battery Battery Supply

Observer-based event-triggered networked multi-drives speed consensus

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Digital Communications and Networks 2022年第5期8卷 763-769页

作者： Suhaib Masroor chen Peng School of Mechatronics Engineering and Automation Shanghai UniversityShanghai200444China

The problem of having an identical speed when dealing with multiple motors always exists in the industry.There are several methods to address the problem,but all the methodologies have two common drawbacks.Firstly,the control design requires continuous information on the desired speed and the actual speed of motors;secondly,it is sometimes difficult to directly measure the speed variables.In the proposed study,both of these drawbacks are addressed by designing an observer-based event-triggered networked multi-agent system.The proposed method uses the leader following consensus approach with a centralized event triggering control design so that whenever a follower's speed diverges from that of the leader,an event is triggered,which communicates and resets all the agents to the leader's speed.Moreover,an observer is designed such that the ith agent uses its jth neighbor agent and observer speed information to estimate the leader's speed.The stability of the proposed design is formulated by Lyapunov stability,while the simulation results endorse the design concepts and energy saving.

关键词： Multi-agent coordination control Centralized event triggering Network control system Sylvester equation Lyapunov stability

Analysis of Key Disciplinary Parameters in Floating Offshore Wind Turbines with An AI-Based SADA Method

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China Ocean Engineering 2022年第4期36卷 649-657页

作者： chen Peng HU Zhi-qiang School of Engineering Newcastle UniversityNewcastle upon TyneNE17RUUnited Kingdom

Floating offshore wind turbines(FOWTs)are a promising offshore renewable energy harvesting facility but requesting multiple-disciplinary analysis for their dynamic performance predictions.However,engineering-fidelity level tools and the empirical parameters pose challenges due to the strong nonlinear coupling effects of FOWTs.A novel method,named SADA,was proposed by chen and Hu(2021)for optimizing the design and dynamic performance prediction of FOWTs in combination with AI technology.In the SADA method,the concept of Key Disciplinary Parameters(KDPs)is also proposed,and it is of crucial importance in the SADA method.The purpose of this paper is to make an in-depth investigation of the characters of KDPs and the internal correlations between different KDPs in the dynamic performance prediction of FOWTs.Firstly,a brief description of SADA is given,and the basin experimental data are used to conduct the training process of SADA.Secondly,categories and boundary conditions of KDPs are introduced.Three types of KDPs are given,and different boundary conditions are used to analyze KDPs.The results show that the wind and current in Environmental KDPs are strongly correlated with the percentage difference of dynamic response rather than that by wave parameters.In general,the optimization results of SADA consider the specific basin environment and the coupling results between different KDPs help the designers further understand the factors that have a more significant impact on the FOWTs system in a specific domain.

关键词： floating offshore wind turbine SADA KDPs machine learning basin experiment

Adaptive H_(∞) event-triggered load frequency control in islanded microgirds with limited spinning reserve constraints

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Protection and Control of Modern Power Systems 2023年第2期8卷 231-243页

作者： Yajian Zhang chen Peng School of Mechatronic Engineering and Automation Shanghai UniversityShanghaiChina

Using an islanded microgrid(MG)with large-scale integration of renewable energy is the most popular way of solving the reliable power supply problem for remote areas and critical electrical users.However,compared with traditional power systems,the limited spinning reserves and network communication bandwidth may cause weak frequency stability in the presence of stochastic renewable active outputs and load demand fluctuations.In this paper,an adap-tive event-triggered control(ETC)strategy for a load frequency control(LFC)system in an islanded MG is proposed.First,a bounded adaptive event-triggered communication scheme is designed.This not only saves on network resources,but also ensures that the control center has a sensitive monitoring ability for the MG operating status when the frequency deviations have been effectively damped.Secondly,by fully considering the spinning reserve con-straints and uncertain communication delays,the LFC system is described as a nonlinear model with saturation terms.Design criteria for ETC parameters are strictly deduced based on Lyapunov stability theory.Finally,an ETC parameter optimization algorithm based on random direction search is developed to reconcile the bandwidth occupancy and control performance.The effectiveness of the proposed method is verified in an MG test system.

关键词： Microgrid Load frequency control Event-triggered control Nonlinear saturation Time delay

“Rigid-elastic chimera” pore skeleton model and overpressure porosity measurement method for shale: A case study of the deep overpressure siliceous shale of Silurian Longmaxi Formation in southern Sichuan Basin, SW China

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Petroleum Exploration and Development 2023年第1期50卷 125-137页

作者： SHI Qiang chen Peng PetroChina Research Institute of Petroleum Exploration&Development Beijing 100083China

Based on analysis of pore features and pore skeleton composition of shale,a“rigid elastic chimeric”pore skeleton model of shale gas reservoir was built.Pore deformation mechanisms leading to increase of shale porosity due to the pore skeleton deformation under overpressure were sorted out through analysis of stress on the shale pore and skeleton.After reviewing the difficulties and defects of existent porosity measurement methods,a dynamic deformed porosity measurement method was worked out and used to measure the porosity of overpressure Silurian Longmaxi Formation shale under real formation conditions in southern Sichuan Basin.The results show:(1)The shale reservoir is a mixture of inorganic rock particles and organic matter,which contains inorganic pores supported by rigid skeleton particles and organic pores supported by elastic-plastic particles,and thus has a special“rigid elastic chimeric”pore structure.(2)Under the action of formation overpressure,the inorganic pores have tiny changes that can be assumed that they don’t change in porosity,while the organic pores may have large deformation due to skeleton compression,leading to the increase of radius,connectivity and ultimately porosity of these pores.(3)The“dynamic”deformation porosity measurement method combining high injection pressure helium porosity measurement and kerosene porosity measurement method under ultra-high variable pressure can accurately measure porosity of unconnected micro-pores under normal pressure conditions,and also the porosity increment caused by plastic skeleton compression deformation.(4)The pore deformation mechanism of shale may result in the"abnormal"phenomenon that the shale under formation conditions has higher porosity than that under normal pressure,so the overpressure shale reservoir is not necessarily“ultra-low in porosity”,and can have porosity over 10%.Application of this method in Well L210 in southern Sichuan has confirmed its practicality and reliability.

关键词： shale gas “rigid-elastic chimera”pore model “dynamic”deformation porosity deep shale layers Silurian Longmaxi Formation Sichuan Basin

Rural-Oriented Pre-service Teachers Transitioning in Multiple Identities:An Ethnographic Study in a Chinese University Based on Sociological Institutionalism

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Frontiers of Education in China 2022年第3期17卷 433-458页

作者： LIU cheng chen Peng School of Education Science Jiangsu Normal UniversityXuzhou 221116China

Based on the identity theory and the sociological institutionalism theory,this study establishes a triple identity analysis framework and describes the interaction pattern and internal logic between the internal identity cognition and the external identity expectation of rural-oriented pre-service teachers through the study of educational ethnography.It is found that while they form a dominant identity in the interaction with policies,they are also endowed with the identity“privilege”and the energized learning motivation,but there are mutual restrictions between policies’entitlement and empowerment.In the interaction with social norms,they exchange with the policies reciprocally due to the torture of moral obligation,and then consciously undertake the responsibilities of their identity,but ego and publicity still conflict with each other in the underlying logic.In the interaction with their ego,they gradually reconcile with themselves and reshape their identity after experiencing identity rejection under the stigmatization cognition.Then,in the process of habitualization and institutionalization of identity,they adopt two different strategies:passive compromise and active adjustment.

关键词： rural-oriented pre-service teacher government-paid pre-service teacher identity sociological institutionalism educational ethnography

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陈鹏:平均时尚主义

艺术与设计 2021年第2期10卷 110-113页

作者：张倩倩不详

近期,2020年度亚洲十佳设计师(10 ASIAN DESIGNERS TO WATCH)获奖名单公布,来自中国的设计师陈鹏,用极具辨识度的前卫设计风格,打破了“羽绒服”固有的臃肿形象,获得2020年度亚洲十佳设计师称号。对于陈鹏这一代的设计师来说,时尚不是潮... 详细信息

近期,2020年度亚洲十佳设计师(10 ASIAN DESIGNERS TO WATCH)获奖名单公布,来自中国的设计师陈鹏,用极具辨识度的前卫设计风格,打破了“羽绒服”固有的臃肿形象,获得2020年度亚洲十佳设计师称号。对于陈鹏这一代的设计师来说,时尚不是潮流,更像一种交流,一种对生活的表达。

关键词：辨识度时尚羽绒服设计师

A Novel Memory-Based Scheduling Protocol for Networked Control Systems Under Stochastic Attacks and Bandwidth Constraint

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IEEE/CAA Journal of Automatica Sinica 2023年第5期10卷 1336-1339页

作者： Hongchenyu Yang chen Peng Zhiru Cao the School of Mechatronic Engineering and Automation Shanghai UniversityShanghai 200444China

Dear Editor,In this letter,a novel memory-based scheduling protocol(MBSP)is investigated for networked control systems(NCSs)under bandwidth constraint and stochastic denial-of-service(DoS)attacks.First,considering the bandwidth constraint and that multiple sensors'channels may be attacked,a novel memory-based scheduling protocol is proposed to alleviate the pressure of signal transmission.

关键词： service Constraint DoS