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Furan-derived Schiff base covalent adaptable thermosets with recyclability and anti-flammability

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Green Chemical engineering 2024年第3期5卷 364-373页

作者： Ping Zhang Shuyu Jia Ruishi xie Lin Chen Ying Xiong State Key Laboratory of Environment-friendly Energy Materials School of Materials Science and EngineeringSouthwest University of Science and TechnologyMianyang621010China

Conventional thermosetting polymers,mostly derived from nonrenewable petroleum resources,are not reprocessable and recyclable due to their highly cross-linked three-dimensional networks and face the disadvantage of high *** solve these issues,in this study,we synthesized a novel Schiff base covalent adaptable thermoset from a furan-derived tri-aldehyde monomer(TMFP)and a furan-derived di-amine monomer(DFDA).The as-prepared TMFP-DFDA-Vitrimer exhibited superior anti-flammability with a high limiting oxygen index(LOI)of 35.0%and a UL-94 V-0 rating,which was attributed to the excellent charring ***,TMFPDFDA-Vitrimer could also be conveniently recycled by chemical decomposition under a mixed hydrochloric acid/tetrahydrofuran(HCl/THF)*** recycling for 5 times,the thermal,mechanical,and flame retardant properties of the recycled TMFP-DFDA-Vitrimer retained almost unchanged compared to the original *** work provides a prime instance to develop advanced thermosetting polymers from abundant furan-based compounds.

关键词： Furan-based compounds Vitrimer Recyclability Flame retardancy

Purity-dependent Lorenz number,electron hydrodynamics and electron-phonon coupling in WTe_(2)

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Science china(Physics,Mechanics & Astronomy) 2024年第8期67卷 153-158页

作者： Wei xie Feng Yang Liangcai Xu Xiaokang Li Zengwei Zhu Kamran Behnia Wuhan National High Magnetic Field Center and school of Physics Huazhong University of Science and TechnologyWuhan 430074China Laboratoire de Physique et d’Etude des Matériaux(ESPCI-CNRS-Sorbonne Université)PSL university Paris 75005France

We present a study of electrical and thermal transport in Weyl semimetal WTe_(2)down to 0.3 *** Wiedemann-Franz law holds below 2 K and a downward deviation starts *** deviation is more pronounced in cleaner samples,as expected in the hydrodynamic picture of electronic transport,where a fraction of electron-electron collisions conserve *** are the dominant heat carriers and their mean-free-path does not display a Knudsen *** is presumably a consequence of weak anharmonicity,as indicated by the temperature dependence of the specific *** momentum exchange between phonons and electrons leads to quantum oscillations of the phononic thermal ***-Grüneisen picture of electron-phonon scattering breaks down at low temperature when Umklapp ph-ph collisions cease to be a sink for electronic flow of *** with semi-metallic Sb shows that normal ph-ph collisions are amplified by *** both semimetals,at cryogenic temperature,e-ph collisions degrade the phononic flow of energy but not the electronic flow of momentum.

关键词： thermal conductivity Wiedemann-Franz law electron hydrodynamics electron-phonon coupling

A comparative study of data-driven battery capacity estimation based on partial charging curves

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Journal of Energy Chemistry 2024年第1期88卷 409-420,I0010页

作者： Chuanping Lin Jun Xu Delong Jiang Jiayang hou Ying Liang Xianggong Zhang Enhu Li Xuesong Mei State Key Laboratory for Manufacturing Systems engineering Xi’an Jiaotong UniversityXi’an 710049ShaanxiChina Shaanxi Key Laboratory of Intelligent Robots School of Mechanical EngineeringXi’an Jiaotong UniversityXi’an 710049ShaanxiChina Department of electrical engineering and Automation Luoyang Institute of Science and TechnologyLuoyang 471023HenanChina Wuhan Institute of Marine Electric Propulsion China State Shipbuilding Corporation LimitedWuhan 430064HubeiChina Gresgying Digital technology Ltd. Xi’an 710086ShaanxiChina

With its generality and practicality, the combination of partial charging curves and machine learning(ML) for battery capacity estimation has attracted widespread attention. However, a clear classification,fair comparison, and performance rationalization of these methods are lacking, due to the scattered existing studies. To address these issues, we develop 20 capacity estimation methods from three perspectives:charging sequence construction, input forms, and ML models. 22,582 charging curves are generated from 44 cells with different battery chemistry and operating conditions to validate the performance. Through comprehensive and unbiased comparison, the long short-term memory(LSTM) based neural network exhibits the best accuracy and robustness. Across all 6503 tested samples, the mean absolute percentage error(MAPE) for capacity estimation using LSTM is 0.61%, with a maximum error of only 3.94%. Even with the addition of 3 m V voltage noise or the extension of sampling intervals to 60 s, the average MAPE remains below 2%. Furthermore, the charging sequences are provided with physical explanations related to battery degradation to enhance confidence in their application. Recommendations for using other competitive methods are also presented. This work provides valuable insights and guidance for estimating battery capacity based on partial charging curves.

关键词： Lithium-ion battery Partial charging curves Capacity estimation Data-driven Sampling frequency

纳米复相陶瓷超声磨削频率与表面质量关系的实验研究

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上海交通大学学报 2010年第12期44卷 1763-1766页

作者：马辉赵波谢萍上海交通大学机械与动力工程学院上海200240 河南理工大学机械学院河南焦作454000

基于超声刻划试验得出超声振动下单颗磨粒去除材料方式的变化,从本质上解释了超声磨削下表面质量提高的原因.超声振动作用会导致材料的磨削层表面等效硬度急剧降低,材料去除方式从脆性向塑性转变,且随频率升高现象更为明显.实验结果表明... 详细信息

基于超声刻划试验得出超声振动下单颗磨粒去除材料方式的变化,从本质上解释了超声磨削下表面质量提高的原因.超声振动作用会导致材料的磨削层表面等效硬度急剧降低,材料去除方式从脆性向塑性转变,且随频率升高现象更为明显.实验结果表明,超声磨削下纳米复相陶瓷材料的表面质量高于普通磨削,且超声振动频率的升高对提高表面质量有促进作用.

关键词：纳米复相陶瓷超声磨削表面质量刻划

Adaptive coupled-sliding-variable-based finite-time control of composite formation for multi-robot systems

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Science china(Information Sciences) 2024年第10期67卷 244-260页

作者： Xinru MA Hengyu LI Jun LIU Yueying WANG Shaorong xie Jun LUO school of Mechatronic engineering and Automation Shanghai University school of Mathematics and Computer Application technology Jining University school of Computer Science Shanghai University College of mechanical and Vehicle engineering Chongqing University

This paper focuses on the finite-time control(FTC) of the composite formation consensus(CFC)problems for multi-robot systems(MRSs). The CFC problems are firstly proposed for MRSs under the complex network topology of cooperative or cooperative-competitive networks. Regarding the problems of FTC and CFC on multiple Lagrange systems(MLSs), coupled sliding variables are introduced to deal with the robustness and consistent convergence. Then, the adaptive finite-time protocols are given based on the displacement approaches. With the premised FTC, tender-tracking methods are further developed for the problems of tracking information disparity. Stability analyses of those MLSs mentioned above are clarified with Lyapunov candidates considering the coupled sliding vectors, which provide new verification for tender-tracking systems. Under the given coupled-sliding-variable-based finite-time protocols, MLSs distributively adjust the local formation error to achieve global CFC and perform uniform convergence in time-varying tracking. Finally, simulation experiments are conducted while providing practical solutions for the theoretical results.

关键词： composite formation time-vary tracking information disparity tender-tracking finite-time control nonlinear robots complex networks symmetry consensus

STUDY OF PNEUMATIC CAPSULE TRANSPORTATION PIPELINE DRIVEN BY ELECTROMAGNETIC FORCE

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STUDY OF PNEUMATIC CAPSULE TRANSPORTATION PIPELINE DRIVEN BY...

An improved group search optimizer for mechanical design optimization problems

2006年中国机械工程学会年会暨中国工程院机械与运载工程学部首届年会

作者： LIN Yu, ZHANG Chaolei, WU Haiyan school of mechanical and electrical engineering, Jiangxi university of Science & technology, Ganzhou 341000, china

Aimed at increasing transport capacity of freight pipeline, lowing energy consumption and reducing noise pollution, a pneumatic capsule pipeline for freight conveying based on the use of electromagnet

关键词： Freight pipeline pneumatic capsule transportation linear motor electric-magnetic drive.

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Progress in Natural Science:Materials International 2009年第1期19卷 91-97页

作者： Hai Shena,b,c,Yunlong Zhu a,Ben Niu a,b,Q.H.Wu d a Key Laboratory of Industrial Informatics,Shenyang Institute of Automation,Chinese Academy of Sciences,Shenyang 110016,china b Graduate school of the Chinese Academy of Sciences,Beijing 100049,china c College of Physics Science and technology,Shenyang Normal university,Shenyang 110034,china d Department of electrical engineering and Electronics,The university of Liverpool,Brownlow Hill,Liverpool,L69 3GJ,UK [a]Key Laboratory of Industrial Informatics Shenyang Institute of Automation Chinese Academy of Sciences Shenyang 110016 China [b]Graduate School of the Chinese Academy of Sciences Beijing 100049 China [c]College of Physics Science and Technology Shenyang Normal University Shenyang 110034 China [d]Department of Electrical Engineering and Electronics The University of Liverpool Brownlow Hill Liverpool L69 3GJ UK

This paper presents an improved group search optimizer(iGSO) for solving mechanical design optimization *** the proposed algorithm,subpopulations and a co-operation evolutionary strategy were adopted to improve the global search capability and convergence *** iGSO is evaluated on two optimization problems of classical mechanical design:spring and pressure *** experimental results are analyzed in comparison with those reported in the *** results show that iGSO has much better convergence performance and is easier to implement in comparison with other existing evolutionary algorithms.

关键词： mechanical optimization problem GSO Constrained optimization problem

Stress-Induced Phase Transformation in Incompressible Materials and Stability of Multi-Phase Deformation

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Transactions of Tianjin university 2007年第3期13卷 195-199页

作者：谢宇新张义同敖涛任述光 school of mechanical engineering Tianjin University

The stress-induced phase transformation in incompressible materials and the interfacial stability of multi-phase deformation were studied. The existence of multi-phase deformation was determined through exploring whether the material would lose the strong ellipticity at some deformation gradient. Then, according to the stability criterion which is based on a quasi-static approach, the stability of the multi-phase deformation in incompressible materials was investigated by studying the growth/decay behaviour of the interface in the undeformed configuration when it is perturbed. At last, the way to define multi-phase deformation in incompressible materials was concluded and testified by a corresponding numerical example.

关键词： phase transformation interfacial stability incompressible material

Extraction of Impulse Signals from Vibration Signals of Defective Rolling Bearings Using a Blind Deconvolution Algorithm

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Extraction of Impulse Signals from Vibration Signals of Defe...