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11th International Conference on Environmental and engineering Geophysics, ICEEG 2024

作者： Wang, Guanchao Zhao, Guangmao Niu, Yongxiao Chen, Chengshen Li, Guohe Li, Peng China Railway Design Corporation Tianjin China Natl. Eng. Research Center of Digital Construction and Evaluation Technology of Urban Rail Transit Tianjin China National and Local Joint Engineering Laboratory of Rail Transit Survey & Design Tianjin China

Imaging near-surface structures, such as voids, tunnels, or high-contrast anomalies, is an essential and critical task in urban area underground engineering projects;the required accuracy is within a few meters vertically and horizontally, which poses considerable challenges to geophysical surveys in shallow subsurface detection. Geophysical methods like seismic are great tools for subsurface exploration with high resolution. Currently, since explosive sources are prohibited in urban areas, passive seismic methods that record the constant vibration signals generated by natural and human activities have become more desirable. Thus, this abstract presents a novel nondestructive geophysical approach using ambient noise recording, namely seismo-acoustic resonance imaging. This approach is mainly based on the analysis of the resonance frequencies content information within the data, related to the mechanical properties of structures under investigation. These resonance frequencies will then be translated into depth-domain images using a kind of layer-stripping strategy;Further, the images are combined with results of other geophysical methods (GRP, surface wave analysis, autocorrelation, etc.) for necessary interpretation. In practice, as a low-cost single-station geophysical technique, resonance imaging is readily applicable to a broad range of scales, which meets the need for spatial suitability, and efficiency in engineering investigations. Two examples are presented in the paper, as the first is elaborated on a known metro tunnel, and the second is demonstrated in an unknown investigation site. The results of two experiments have shown resonance imaging to be very well adapted for shallow subsurface detection. © 2024 Institute of Physics Publishing. All rights reserved.

关键词： Cost engineering

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The HY5 transcription factor negatively regulates ethylene production by inhibiting ACS1 expression under blue light conditions in pear

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Horticultural Plant Journal 2023年第5期9卷 920-930页

作者： Weiting Liu Lichao Zhang Li Ma Hui Yuan Aide Wang Key Laboratory of Fruit Postharvest Biology Key Laboratory of Protected HorticultureNational&Local Joint Engineering Research Center of Northern Horticultural Facilities Design&Application TechnologyCollege of HorticultureShenyang Agricultural UniversityShenyangLiaoning 110866China Department of Foreign Language Teaching Shenyang Agricultural UniversityShenyangLiaoning 110866China

Ethylene is the main factor controlling fruit ripening of pear(Pyrus ussuriensis).Ethylene production rate is negatively correlated with fruit shelf life;therefore,it is important to decrease the ethylene levels for optimal fruit ***,we observed that blue light treatment could inhibit ethylene production and promote the expression of ELONGATED HYPOCOTYL 5(PuHY5),a basic leucine zipper domain(bZIP)transcription *** following studies showed that PuHY5 could bind to the promoter of ACC synthase 1(PuACS1),a rate-limiting enzyme in ethylene biosynthesis,and inhibit its *** pears in which Pu HY5 was silenced,the ethylene production and PuACS1 expression were much higher than those in the control *** results demonstrated that blue light inhibited ethylene production through the induction of Pu HY5 in *** finding provides a new method for prolonging fruit shelf life.

关键词： Pear Pyrus ussuriensis Fruit ripening Blue light Ethylene synthesis PuHY5 PuACS1

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Accurate MTPA Control Based on Ferrari Method for IPMSM with Partial Derivative Term Calculation 27

Accurate MTPA Control Based on Ferrari Method for IPMSM with...

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27th International Conference on electrical Machines and Systems, ICEMS 2024

作者： Li, Yiyang Gu, Xin Wang, Zhiqiang Guo, Liyan Chen, Wei Li, Xinmin Li, Chen School of Electronics and Information Engineering Tiangong University Tianjin China School of Electrical Engineering Tiangong University Tianjin China Tianjin Key Laboratory of Intelligent Control of Electrical Equipment Tianjin China National Local Joint Engineering Research Center of Electrical Machine System Design and Manufacturing China Zhejiang University Advanced Electrical Equipment Innovation Center Hangzhou China

ISBN: (纸本)9784886864406

Even if the exact motor parameters are known, the MTPA strategy cannot obtain precise maximum torque per ampere (MTPA) points under large current amplitude because the partial derivative of inductance to current is ignored in the modeling process. In view of this, the MTPA mathematical model considering the partial derivative of inductance to current is established in this paper, and the MTPA point tracking error caused by ignoring the partial derivative in the modeling process based on Ferrari method is analyzed. Then, an offline-online combined method for calculating the partial derivative term is proposed to compensate the MTPA tracking error. On this basis, an MTPA control strategy based on Ferrari method considering the partial derivative of inductance to current is proposed. Experiment to verify the feasibility and effectiveness of the proposed method. © 2024 The Institute of electrical Engineers of Japan.

关键词： Permanent magnets

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Reinforcement Effect Evaluation on Dynamic Characteristics of an Arch Bridge Based on Vehicle-Bridge Coupled Vibration Analysis

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Computer Modeling in engineering & Sciences 2022年第5期131卷 1041-1061页

作者： Yanbin Tan Xingwen He Lei Shi Shi Zheng Zhe Zhang Xinshan Wang National&Local Joint Engineering Laboratory of Bridge and Tunnel Technology Dalian University of TechnologyDalian116023China Design Institute of Civil Engineering&Architecture of Dalian University of Technology Co. Ltd.Dalian116023China Faculty of Infrastructure Engineering Dalian University of TechnologyDalian116023China

To numerically evaluate the reinforcement effect on dynamic characteristics of a concrete-filled steel tube arch bridge with vibration problems,a 12-degree-of-freedom sprung-mass dynamic vehicle model and a 3D finite element bridge model were ***,the coupled equations of vehicle-bridge interaction were derived and a computer program was developed using the FORTRAN *** program can accurately simulate vehicle-bridge coupled vibration considering the bumping effect and road surface irregularity during motion of the *** simulated results were compared with those of relevant literatures to verify the correctness of the self-developed ***,three reinforcement schemes for the bridge(Addition of longitudinal beams,Reinforcement of bridge decks,and Replacement of suspenders)were proposed and numerically simulated,and the vibration reduction effects of the three schemes were evaluated based on the numerical results to find effective *** is confirmed that the reinforcement scheme of Addition of longitudinal beams shows the most significant vibration reduction *** is recommended in the engineering practice that the combination of the reinforcement schemes of Addition of longitudinal beams and Replacement of bridge deck can be used to solve the excessive vibration problem.

关键词： Arch bridge vehicle-bridge coupled vibration reinforcement numerical evaluation

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Dynamic Event-Triggered Control Under the Round-Robin Protocol for 2-D Continuous System in Roesser Model

Dynamic Event-Triggered Control Under the Round-Robin Protoc...

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Chinese Automation Congress (CAC)

作者： Hongsheng Hu Hao Xu Yufei Luo Yunhe Meng Shipei Huang Junhua Huang School of Artificial Intelligence Sun Yat-sen University (Zhuhai Campus) Zhuhai China National-Local Joint Engineering Laboratory for Digitalize Electrical Design Technology Wenzhou University Wenzhou China

In this work, we address the issue of event-triggered control under the Round-Robin protocol (RRP) for a specific class of 2-D continuous system in Roesser model that is subject to communication constraints. Our approach not only considers network congestion but also takes into account the problem of data collision. To reduce network overloads and save bandwidth, we propose a dynamic event-triggered scheme that determines whether a datum should be transmitted or not. Additionally, RRP is utilized to assign priority to the actuator at a given moment. Sufficient conditions of performance are established to ensure the considered system is stable. Moreover, an event-based control law under the RRP is constructed. The effective of the proposed methods are demonstrated by a numerical example in the end.

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A Cost-Effective Hybrid Si/ SiC Dual Bridge Parallel LLC Resonant Converter for High Current Application

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IEEE Journal of Emerging and Selected Topics in Power Electronics 2025年

作者： Ke, Zipeng Wang, Jun Hu, Bo Zhang, Chao Peng, Zishun Dai, Yuxing Shen, Z. John Hunan University College of Electrical and Information Engineering Changsha410012 China Guizhou University Electrical Engineering College Guiyang550025 China Wenzhou University National-Local Joint Engineering Laboratory of Digitalize Electrical Design Technology Wenzhou325035 China Simon Fraser University School of Mechatronic Systems Engineering SurreyBCV3T 0A3 Canada

The SiC-based dual bridge paralleled (DBP) LLC resonant converter offers advantages of low current stress and high efficiency but suffers from high costs. In this article, a cost-effective hybrid Si/SiC DBP LLC resonant converter is proposed, which consists of a high-current low-cost Si IGBTs bridge arm and a low-current SiC MOSFETs bridge arm, obtaining significant cost-reduction. Benefiting the soft-switching operation of the Si IGBTs bridge arm, the proposed hybrid Si/SiC DBP LLC converter can achieve comparable switching losses with full-SiC MOSFETs design. Meanwhile, fewer resonant tanks are required benefiting from the topology reconstruction of the proposed converter, in comparison to the prior-art design of DBP LLC resonant converter, further reducing costs and power loss. A 6-kW prototype of the hybrid DBP LLC resonant converter, utilizing both Si IGBTs and SiC MOSFETs, is constructed as a case study to validate the proposed approach. Compared to the prior art full-SiC DBP LLC converter, the proposed hybrid Si/SiC LLC converter achieves comparable total power loss under high output power, while offering 51.7% switching device cost, 22.9% resonant components cost, and 31.6% total cost reductions. © 2013 IEEE.

关键词： high efficiency Hybrid Si/SiC LLC resonant converter power loss

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Adaptive constrained population extremal optimisation-based robust proportional-integral-derivation frequency control method for an islanded microgrid

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IET Cyber-Systems and Robotics 2021年第3期3卷 210-227页

作者： Kang-Di Lu Guo-Qiang Zeng Wuneng Zhou College of Information Sciences and Technology Donghua UniversityShanghaiChina College of Cyber Security and the National-Local Joint Engineering Research Center of Network Security Detection and Protection Technology Jinan UniversityGuangzhouChina National-Local Joint Engineering Laboratory of Digitalise Electrical Design Technology Wenzhou UniversityWenzhouChina

The expected penetration of renewable sources is driving the islanded microgrid towards uncertainties,which have highly influence the reliability and complexities of frequency *** alleviate the influence caused by load fluctuations and inherent variability of renewable sources,this article proposes an optimised robust proportional-integralderivation(PID)frequency control method by taking full advantage of a robust control strategy while simultaneously maintaining the basic characteristics of a PID *** the process of iterated optimisation,a weighted objective function is used to balance the tracking error performance,robust stability and disturbance attenuation ***,the robust PID frequency(RPIDF)controller is determined by an adaptive constrained population extremal optimisation algorithm based on self-adaptive penalty constraint-handling *** proposed control method is examined on a typical islanded microgrid,and the control performance is evaluated under various disturbances and parametric ***,the simulation results indicate that the fitness value of the proposed method is 1.7872,which is lower than 2.9585 and 3.0887 obtained by two other evolutionary algorithms-based RPIDF ***,the comprehensive simulation results fully demonstrate that the proposed method is superior to other comparison methods in terms of four performance indices on the most considered scenarios.

关键词： constrained evolutionary algorithm frequency control islanded microgrid population extremal optimisation robust PID controller

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Enhanced charge collection of AgNWs-based top electrode to realize high-performance,all-solution processed organic solar cells

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Science China Chemistry 2024年第10期67卷 3347-3356页

作者： Juanyong Wan Yang Chen Weijie Chen Jinfeng Xia Guang Zeng Jianlei Cao Chuang Jin Yunxiu Shen Xiaoxiao Wu Haiyang Chen Junyuan Ding Xue-mei Ou Yaowen Li Yongfang Li Laboratory of Advanced Optoelectronic Materials Suzhou Key Laboratory of Novel Semiconductor-Optoelectronics Materials and DevicesCollege of ChemistryChemical Engineering and Materials ScienceSoochow UniversitySuzhou 215123China Jiangsu Key Laboratory of Advanced Negative Carbon Technologies Soochow UniversitySuzhou 215123China State and Local Joint Engineering Laboratory for Novel Functional Polymeric Materials Jiangsu Key Laboratory of Advanced Functional Polymer Design and ApplicationCollege of ChemistryChemical Engineering and Materials ScienceSoochow UniversitySuzhou 215123China Beijing National Laboratory for Molecular Sciences CAS Key Laboratory of Organic SolidsInstitute of ChemistryChinese Academy of SciencesBeijing 100190China Jiangsu Sidike New Materials Science and Technology Co. Ltd.Suqian 215400China

All-solution processed organic solar cells are the ultimate aim of printable photovoltaics,but their electrical losses arising from poor contact of top electrodes greatly limit efficiency *** solve the problem,a solution-processed hybrid top electrode was constructed using silver nanowires(AgNWs)as the skeleton and ZnO nanoparticles(ZnO-NPs)as the *** constructing the skeleton,a spin-rinsing treatment was first used to reduce the amount of the residual insulating polyvinylpyrrolidone wrapped around the AgNWs to promote intimate contact among the AgNWs in the ***,the ZnO-NPs matrix was deposited onto the AgNWs skeleton,bridging the AgNWs skeleton with the underlayer ZnO-NPs electron transporting layer(ETL).The underlayer ZnO-NPs ETL can also induce the growth of the ZnO-NPs matrix to minimize lattice mismatch,which creates additional transport channels from the ETL to the AgNWs skeleton for charge *** a result,the obtained electrode significantly enhances the electrical contact in the device,thus delivering record power conversion efficiencies of 16.04%and 14.54%for rigid and flexible all-solution processed OSCs,respectively.

关键词： solution-processed top electrode organic solar cells AgNWs electrical contact

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Insulator Detection Method Based on Improved Faster R-CNN with Aerial Images 2

Insulator Detection Method Based on Improved Faster R-CNN wi...

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2nd International Symposium on Computer engineering and Intelligent Communications, ISCEIC 2021

作者： Lu, Weikuan Zhou, Zhili Ruan, Xiukai Yan, Zhengbing Cui, Guihua College of Electrical and Electronic Engineering Wenzhou University National-Local Joint Engineering Laboratory for Digitalized Electrical Design Technology Wenzhou China

ISBN: (纸本)9781665441605

Insulators are a critical component in power transmission, and the detection of insulators is an essential prerequisite for achieving insulator status and fault diagnosis. An insulator detection method in aerial images based on the improved Faster R-CNN is proposed to address the problems of inaccurate localization and undetected error in the detection of insulators. In this method, the generalized intersection over union (GIoU) is adopted to overcome that the detection is sensitive to various scales insulators in aerial images, and it also improves the accuracy of insulator localization effectively. Meanwhile, the soft non-maximum suppression (Soft-NMS) algorithm is adopted to avoid missing detection of insulators in the post-processing stage because of mutual occlusion in aerial images. The experimental results show that the proposed method can effectively detect insulators in aerial images with complex backgrounds, and the average accuracy is significantly improved compared with different methods. © 2021 IEEE.

关键词： Image enhancement

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A Photovoltaic MPPT Method Based on Mnemonic Enhancement Optimization with the Use of Past Experience Data 10

A Photovoltaic MPPT Method Based on Mnemonic Enhancement Opt...

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10th IEEE Data Driven Control and Learning Systems Conference, DDCLS 2021

作者： Xia, Tao Zhang, Zhengjiang Hu, Guiting Huang, Shipei Yan, Zhengbing National-Local Joint Engineering Laboratory of Electrical Digital Design Technology Wenzhou University Wenzhou325035 China

ISBN: (纸本)9781665424233

The output characteristics of photovoltaic cells are easily affected by the external environment, so the study of maximum power point tracking (MPPT) technology is of great significance for improving the energy conversion efficiency of photovoltaic cells. Aiming at the problem that the traditional perturbation observation based MPPT method cannot consider the tracking speed and vibration amplitude at the same time, a mnemonic enhancement optimization (MEO) based MPPT method is proposed. This method preserves the past experience data of MPPT, and uses the experience data to estimate a good starting point for MPPT when the external environment changes. BP neural network and interpolation can be applied for the estimation of a good starting point, which can speed up the procedure of MPPT. Compared with other methods through simulations, the results demonstrate that the proposed method can significantly improve the tracking speed and adapt to severe weather. © 2021 IEEE.

关键词： Perturbation techniques

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