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Active learning-based metamodeling for hybrid uncertainty quantification of hydro-mechatronic-control systems:A case study of EHA systems

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Chinese Journal of Aeronautics 2024年第12期37卷 12-30页

作者： Muchen WU Hao CHEN Minghao TAI Tangfan XIAHOU zehua ge Zhenyu LIU Bing CHU Zhongrui ZHAO Yu LIU AVIC Shenyang Aircraft Design and Research Institute Shenyang 110035China School of Mechanical and Electrical Engineering University of Electronic Science and Technology of ChinaChengdu 611731China Center for System Reliability and Safety University of Electronic Science and Technology of ChinaChengdu 611731China

The Electro-Hydrostatic Actuator(EHA)is a typical hydro-mechatronic control *** to the limited accuracy of measurement,inadequate knowledge,and vague judgments,hybrid uncertainties,including aleatory and epistemic uncertainties,inevitably exist in the performance assessment of EHA *** methods ignored the hybrid uncertainties which can hardly obtain a satisfactory result while wasting a lot of time on the experimental *** overcome this drawback,a metamodeling method for hybrid uncertainty propagation of EHA systems is developed via an active learning Gaussian Process(GP)*** proposed method is bifurcated into three pillars:(A)Initializing the GP model and generating the optimum candidate sampling set by an Optimized Max-Minimize Distance(OMMD)algorithm,which aims to maximize the minimum distance between the added samples and original samples,(B)maximizing the learning function and generating new samples by a developed farthest or nearest judgment strategy,while updating the original GP model,and(C)judging the convergence by three uncertainty metrics,i.e.,the area metric,maximum variance metric,and the mean value metric.A numerical example is exemplified to evaluate the effectiveness and efficiency of the proposed ***,the EHA system of aircrafts is examined to show the application of the proposed method for high-dimensional *** effects of the uncertainties in the Proportional-Integral-Differential(PID)of the EHA system are also examined.

关键词： Electro-Hydrostatic Actuator(EHA) Hybrid uncertainty Metamodeling Optimized Max-Minimize Distance(OMMD) Hydro-mechatronic-control systems

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Palladium-Catalyzed Long-Range Isomerization of Aryl Olefins

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Chinese Journal of Chemistry 2022年第19期40卷 2269-2275页

作者： Qianyi ge Jingjie Meng Huikang Liu zehua Yang Zhengxing Wu Wanbin Zhang Hunan Provincial Key Laboratory of Tumor Microenvironment Responsive Drug Research Institute of Pharmacy&Pharmacology School of Pharmaceutical ScienceHengyang Medical SchoolUniversity of South ChinaHengyangHunan421001 China Shanghai Key Laboratory for Molecular Engineering of Chiral Drugs Frontiers Science Center for Transformative MoleculesSchool of Chemistry and Chemical EngineeringShanghai Jiao Tong University800 Dongchuan RoadShanghai200240 China

Long-range olefin isomerization could lead to the remote functionalization of hydrocarbon chains,which is advantageous with regards to atom-,step-,and redox ***,present methodologies for long-range olefin isomerization are mainly focused on heteroatom directed remote olefin migration;studies using aryl groups as the directing group are *** limited examples either utilize aryl olefins with special substituted groups on a benzene ring,or use elaborately optimized ligands or co-catalysts to accelerate the isomerization.A more simple catalytic system for general aryl olefins,without the need for special ligands or co-catalysts,was to be ***,we report a Pd-catalyzed long-range olefin isomerization(up to 15 units)for general aryl olefins via a 1,2-hydrogen shift *** methodology provides a simple pathway to long-range olefin isomerization without the participation of special ligands or co-catalysts.

关键词： Palladium/Long-range Isomerization Arylolefin/1,2-Hydrogenshift

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基于改进式时序模型的塔村水库大坝变形预测研究

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水利技术监督 2025年第1期 205-207,218页

作者：胡泽华中铁水利水电规划设计集团有限公司江西南昌330029

监测大坝变形以预防潜在风险是大坝安全监控的核心。为了准确预测大坝未来的变形趋势,本文提出一种改良的时序分析模型,该模型结合长短时记忆网络(LSTM),注意力机制(Attention)和双位置编码Transformer技术,用于塔村水库大坝监测。通过... 详细信息

监测大坝变形以预防潜在风险是大坝安全监控的核心。为了准确预测大坝未来的变形趋势,本文提出一种改良的时序分析模型,该模型结合长短时记忆网络(LSTM),注意力机制(Attention)和双位置编码Transformer技术,用于塔村水库大坝监测。通过利用LSTM有效处理时间序列数据,Attention机制突出有效特征信息及双位置编码的Transformer的性能增强,该模型展现出较高的预测准确性,表明其在大坝变形预测中的应用潜力。

关键词：大坝变形预测深度学习循环-展开长短时记忆网络 Transformer

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基于滑模观测器的机电作动系统容错控制研究

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飞机设计 2023年第1期43卷 50-54页

作者：吴玥铭周靖翔宋志军葛泽华杨玉梁罗嘉宁沈阳飞机设计研究所辽宁沈阳110035

机电作动器(Electro-Mechanical Actuator,EMA)正在逐步代替液压/气压作动器而广泛应用于航空航天、军事等领域,特别是在多电/全电飞行器中,机电作动系统已引来大量学者开展各类型研究。在EMA的控制方法和实际应用逐渐成熟的前提下,进... 详细信息

机电作动器(Electro-Mechanical Actuator,EMA)正在逐步代替液压/气压作动器而广泛应用于航空航天、军事等领域,特别是在多电/全电飞行器中,机电作动系统已引来大量学者开展各类型研究。在EMA的控制方法和实际应用逐渐成熟的前提下,进一步提高系统的可靠性得到广泛的关注。在EMA运行过程中能够进行实时的故障检测并保证系统的正常运行,有效提高系统可靠性对于EMA的应用具有重要意义。本文提出一种基于滑模观测器的容错控制方法,为EMA在工程应用中有效识别系统的运行状态提供重要手段,具有重要的理论意义和工程应用价值。通过仿真验证得出此方法可靠有效,验证了在系统运行过程中能够快速的识别故障并切换控制,表明EMA系统在此控制方法下具有很好的故障识别和故障隔离能力。

关键词：机电作动器滑模观测器容错控制

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T-ISAAC:a novel TCR cloning system derived from T cells’cis activation

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Signal Transduction and Targeted Therapy 2022年第8期7卷 2632-2633页

作者： zehua Tian neoX Biotech Inc. No.4560 Jinke RoadPudong DistrictShanghai 201210China

In a recent article published in Nature Biomedical Engineering,Kobayashi and colleagues revealed a novel T cell activation induced by cis interaction,and developed the T-cell immunospot array assay on a chip(T-ISAAC)system that could detect antigenspecific T cells and clone the T-cell receptors(TCRs)efficiently based on this finding.

关键词： activation TCR system

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Biophotons Contribute to Retinal Dark Noise

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Neuroscience Bulletin 2016年第3期32卷 246-252页

作者： zehua Li Jiapei Dai Wuhan Institute for Neuroscience and Neuroengineering South Central University for Nationalities Department of Neurobiology College of Life SciencesSouth Central University for Nationalities

The discovery of dark noise in retinal photoreceptors resulted in a long-lasting controversy over its origin and the underlying ***,we used a novel ultra-weak biophoton imaging system（UBIS） to detect biophotonic activity（emission） under dark conditions in rat and bullfrog（Rana catesbeiana） retinas in *** found a significant temperature-dependent increase in biophotonic activity that was completely blocked either by removing intracellular and extracellular Ca^（2＋）together or inhibiting phosphodiesterase *** findings suggest that the photon-like component of discrete dark noise may not be caused by a direct contribution of the thermal activation of rhodopsin,but rather by an indirect thermal induction of biophotonic activity,which then activates the retinal chromophore of ***,this study suggests a possible solution regarding the thermal activation energy barrier for discrete dark noise,which has been debated for almost half a century.

关键词： Biophoton Rat and bullfrog retinas Retinal dark noise Phosphodiesterase 6 Ca2+ Biophoton imaging

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Nanomaterials based flexible devices for monitoring and treatment of cardiovascular diseases(CVDs)

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Nano Research 2023年第3期16卷 3939-3955页

作者： zehua Xiang Mengdi Han Haixia Zhang National Key Laboratory of Science and Technology on Micro/Nano Fabrication Beijing Advanced Innovation Center for Integrated CircuitsSchool of Integrated CircuitsPeking UniversityBeijing 100871China Academy for Advanced Interdisciplinary Studies Peking UniversityBeijing 100871China Department of Biomedical Engineering College of Future TechnologyPeking UniversityBeijing 100871China

Cardiovascular diseases(CVDs)are one of the most serious diseases threatening human health in the ***,effective monitoring and treatment of CVDs are urgently *** with traditional rigid devices,nanomaterials based flexible devices open up new opportunities for further development beneficial from the unique properties of nanomaterials which contribute to excellent performance to better prevent and treat *** review summarizes recent advances of nanomaterials based flexible devices for the monitoring and treatment of ***,we review the outstanding characteristics of ***,we introduce flexible devices based on nanomaterials for practical use in CVDs including in vivo,ex vivo,and in vitro *** last,we make a conclusion and discuss the further development needed for nanomaterials and monitoring and treatment devices to better care CVDs.

关键词： cardiovascular diseases(CVDs) monitoring treatment nanomaterials flexible devices

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Coordination for a Closed-loop Supply Chain with Recycling Platform Considering Dynamic Setting

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Journal of Systems Science and Systems Engineering 2024年第4期33卷 425-451页

作者： zehua Xiang Ting Ji Lingfeng Dong School of Management Zhejiang UniversityHangzhou310058China School of Business Hangzhou City UniversityHangzhou310015China Alibaba Business College Hangzhou Normal UniversityHangzhou311121China

This paper presents a dynamic closed-loop supply chain(CLSC)model,incorporating a manufacturer,a retailer,and an internet recycling platform(IRP),utilizing differential game theory while considering the forgetting effect of *** model encompasses factors such as the quality level of used products and Big Data marketing(BDM),comparing optimal equilibriums under decentralized and cooperative decision *** effectively coordinate the dynamic CLSC at each time point,we propose a revenue-sharing and cost-sharing(RSCS)combined *** addition to ensuring reasonable sharing of revenues and costs,this contract allows the manufacturer to flexibly adjust wholesale prices for final products and transfer prices for used products in order to distribute profits appropriately and achieve Pareto optimality within the CLSC ***,our results indicate that there exists a threshold for Big Data marketing efficiency;high-efficiency BDM not only facilitates increased recycling on Internet platforms but also reduces unit recycling costs for ***,when implementing the combined contract,Big Data marketing efficiency does not impact the transfer price paid by manufacturers to Internet recycling platforms.

关键词： Big Data marketing differential game closed-loop supply chain coordination internet recycling platform

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Characteristics and distribution of phosphorus in surface sediments of a shallow lake

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Journal of Environmental Sciences 2023年第2期124卷 50-60页

作者： Ziwei Long zehua Ji Yuansheng Pei State Key Laboratory of Water Environment Simulation School of EnvironmentBeijing Normal UniversityBeijing 100875China The Key Laboratory of Water and Sediment Sciences Ministry of EducationSchool of EnvironmentBeijing Normal UniversityBeijing 100875China

Phosphorus(P)in sediments plays an important role in shallow lake ecosystems and has a major effect on the lake *** mobility and bioavailability of P primarily depend on the contents of different P forms,which in turn depend on the sedimentary ***,sediment samples from Baiyangdian(BYD)lake were collected and measured by the Standards,Measurements,and Testing procedure and Phosphorus-31 nuclear magnetic resonance spectroscopy(31P NMR)to characterize different P forms and their relationships with sediment physicochemical *** P content in the sediments varied in different areas and had characteristics indicative of exogenous river *** P(334–916 mg/kg)was the dominant form of *** 31P NMR results demonstrated that orthophosphate monoesters(16–110 mg/kg),which may be a source of P when redox conditions change,was the dominant form of organic P(20–305 mg/kg).The distribution of P forms in each region varied greatly because of the effects of anthropogenic activities,and the regions affected by exogenous river input had a higher content of P and a higher risk of P *** component analysis indicated that P bound to Fe,Al,and Mn oxides and hydroxides(NaOH-P)and organic P were mainly derived from industrial and agricultural pollution,*** analysis indicated that increases in pH lead to the release of *** matter plays an important role in the organic P biogeochemical cycle,as it acts as a sink and source of organic P.

关键词： Sediment Phosphorus forms SMT 31P NMR

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Galvanic corrosion behavior of AZ91D alloy/45 steel couple under magnetic field

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Journal of Magnesium and Alloys 2024年第9期12卷 3794-3805页

作者： Xin Zhang Wan Mei zehua Zhou Shaoqun Jiang Gang Wang Xiangru Shi zehua Wang College of Mechanics and Materials Hohai UniversityNanjing211100China

Galvanic corrosion behavior of AZ91D alloy/45 steel couple in 3.5 wt.%NaCl solution under 0,0.2 and 0.4 T magnetic field were studied by microstructure observation,immersion test and electrochemical *** mixed potential theory was used to estimate the galvanic current density and the mixed potential of the galvanic corrosion between AZ91D alloy and 45 *** results indicated that magnetic field could accelerate the corrosion of AZ91D alloy,and impede the corrosion process of 45 *** effect of magnetic field on corrosion sensibility and corrosion rate of these two alloys increased as the intensity *** galvanic corrosion rate of the couple was accelerated by magnetic *** the magnetic field intensity rising,the galvanic corrosion sensibility and corrosion rate of the couple *** effects of magnetic field on the galvanic corrosion performance of the couple and the corrosion behavior of AZ91D alloy and 45 steel were due to the appearance of field gradient force and magnetohydrodynamic(MHD)*** mixed potential theory has a certain accuracy to estimate the Ecouple and icouple values in this work.

关键词： Magnetic field Corrosion behavior Galvanic corrosion The mixed potential theory

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