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Effect of electromagnetic stirrer centered outside the mold on steel flow field of bloom continuous casting

China Foundry 2023年第5期20卷 461-468页

作者： Li-dong Xing Yan-ping Bao Min Wang Yi-hong Li State Key Laboratory of Advanced Metallurgy University of Science and Technology Beijing(USTB)Beijing 100083China Technical Support Center for Prevention and Control of Disastrous Accidents in Metal Smelting University of Science and Technology Beijing(USTB)Beijing 100083China School of Materials Science and Engineering Taiyuan University of Science and TechnologyTaiyuan 030024China

Mold electromagnetic stirring technology for optimizing the flow of molten steel is now widely used in the continuous casting production process of high-quality ***,studies on the case that the center of the electromagnetic stirrer is located outside the mold have not been ***,the effect of the electromagnetic stirrer centered outside the mold on the steel flow field was studied in detail by means of numerical simulations.A Gauss meter was used to measure the magnetic induction intensity at different positions,currents,and *** test results were compared with the simulation results of electromagnetic stirring to calibrate and verify the accuracy of the electromagnetic ***,electromagnetic force was introduced into the flow field model as a source term to study its effect on the flow field under anomalous *** results show that when the center of the electromagnetic stirrer is located outside the mold,the magnetic field strength is about twice as strong as that located inside the *** also leads to an increase in the flow velocity near the electromagnetic *** a result,the optimal electromagnetic stirring parameters(200 A,2.5 Hz)were specified when the center of the electromagnetic stirrer is located outside the mold.

关键词： numerical modeling electromagnetic stirring fluid flow outside the mold bloom

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Research on Grayscale Images Flame Detections Based on Colorazion Algorithm and YOLOv8

Research on Grayscale Images Flame Detections Based on Color...

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2024 IEEE International Conference on Imaging Systems and Techniques, IST 2024

作者： Liu, Peng Sun, Zhenfu Zhou, Biao Wang, Hongyu Qu, Haozhen Institute of Energy and Electrical Engineering Changchun University of Science and Technology Changchun China School of Control and Computer Engineering North China Electric Power University Beijing China

ISBN: (纸本)9798350378214

Flame detection algorithms are crucial for real-time fire monitoring using surveillance cameras. Current flame detection algorithms perform excellently on color cameras;however, many night vision cameras can only capture grayscale images, making flame detection less effective in such scenarios. Traditional flame detection algorithms rely heavily on color features, especially the red and yellow hues of flames. Conversely, grayscale images lack color information, making these algorithms ineffective. To address this limitation, we propose a novel flame detection algorithm that integrates the DeOldify model with the you only look once(YOLOv8) model. DeOldify can effectively add color to grayscale images. YOLOv8 is a powerful object detection model that excels in identifying various objects within an image. This algorithm leverages DeOldify's colorization capabilities and YOLOv8's powerful object detection abilities to enhance flame detection accuracy in grayscale images. This algorithm has been tested multiple times on public datasets, converting original images to grayscale and then colorizing them to construct the dataset. The results show that, compared to grayscale images, this algorithm improves the mean average precision (mAP@0.5) by 19.7% on different validation sets, by 4% on different training sets, and by 12.9% on grayscale images captured by night vision cameras. By comparing the training results of models such as YOLOv8n and YOLOv8s, the colorized images improve the model's performance. This demonstrates the high generalizability of this algorithm. © 2024 IEEE.

关键词： Premixed flames

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controllability of General Linear Discrete Multi-Agent Systems with Directed and Weighted Signed Network

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Journal of Systems science & Complexity 2022年第6期35卷 2107-2130页

作者： ZHAO Lanhao JI Zhijian LIU Yungang LIN Chong Institute of Complexity Science College of AutomationQingdao UniversityQingdao 266071China Shandong Key Laboratory of Industrial Control Technology Qingdao UniversityQingdao 266071China School of Control Science and Engineering Shandong UniversityJinan 250061China Institute of Complecity Science College of AutomationQingdao UniversityQingdao 266071China

This paper investigates the controllability of general linear discrete-time multi-agent systems with directed and weighted signed networks by using graphic and algebraic *** nondelay and delay cases are considered *** the case of no time delay,the upper bound condition of the controllable subspace is given by using the equitable partition method,and the influence of coefficient matrix selection of individual dynamics is *** the case of single delay and multiple delays,the equitable partition method is extended to deal with time-delay systems,and some conclusions are *** particular,some simplified algebraic criteria for controllability of systems with time delay are obtained by using augmented system method and traditional algebraic controllability criteria.

关键词： controllability equitable partition multi-agent system signed network time-delays

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Theoretical analysis for dynamic model of U-shaped electrothermal microactuator based on Chebyshev spectral method 7

Theoretical analysis for dynamic model of U-shaped electroth...

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7th International Conference on Mechanical, Electric, and Industrial engineering, MEIE 2024

作者： Tang, Yujuan Chen, Hao Wang, Xinjie School of Intelligent Science and Control Engineering Jinling Institute of Technology Nanjing211169 China College of Technology Lishui University Lishui323000 China School of Mechanical Engineering Nanjing University of Science and Technology Nanjing210094 China

This paper presents a largely and accurate analysis for dynamic model of U-shaped actuator that considers the material parameters dependent on temperature. The electro-thermal analysis for temperature distribution and thermo-mechanical analysis for deflection is carried out. The electro-thermal dynamic behaviour is described by piecewise one-dimensional (1D) heat transfer partial differential equations (PDE) for each beam of U-shaped actuator. A combination of Chebyshev spectral method for space domain and Euler forward difference method for time domain is used to solve these equations. The convergence test is first done to ensure the result convinced. © Published under licence by IOP Publishing Ltd.

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Detection of Melanoma Based on Improved YOLOv8 13

Detection of Melanoma Based on Improved YOLOv8

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13th IEEE Data Driven control and Learning Systems Conference, DDCLS 2024

作者： Ji, Honghai Zheng, Xuechen Xiong, Shuangshuang Fan, Lingling Wang, Li School of Electronics & Control Engineering North China University of Technology Beijing100144 China School of Automation Beijing Information Science and Technology University Beijing100096 China

ISBN: (纸本)9798350361674

The incidence of skin cancer is increasing globally, with melanoma being the most formidable form of skin cancer. Melanoma originates from melanocytes, which exhibit a high degree of visual similarity. Moreover, dermoscopy image data often suffer from hair occlusion and the lesion area appears relatively small in the images, making it challenging for traditional methods to achieve accurate recognition and detection results. In this regard, we propose a YOLOv8 framework based on multi-scale sequence fusion(MSSF) for melanoma detection. This approach enhances the Neck structure of YOLOv8 and improves the network's ability to extract multi-scale information by introducing the Multi-scale Sequence Fusion module. In addition, we implemented a morphological black hat based hair processing method to reduce hair occlusion. In the ISIC datasets, compared with the unimproved algorithm, the mean average precision(Map) at 50 IoU is increased by 5.7%, Map between 50 and 95 IoU is increased by 7.5%, and the number of parameters is decreased by 12.5%. © 2024 IEEE.

关键词： Lung cancer

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In-situ catalytic decomposition of emitted ammonia from municipal solid waste gasification by Ni–M bimetallic catalysts supported on sewage sludge-derived biochar

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Waste Disposal and Sustainable Energy 2023年第2期5卷 113-124页

作者： Xueyu Ding Yaji Huang Xinxin Dong Jiaqi Zhao Mengzhu Yu Xinqi Tian Jinlei Li Xuewei Zhang Yuxin Li Zekun Wei Key Laboratory of Energy Thermal Conversion and Control of Ministry of Education School of Energy and EnvironmentSoutheast UniversityNanjing210096China Department of Transdisciplinary Science and Engineering School of Environment and SocietyTokyo Institute of TechnologyYokohamaKanagawa2268503Japan

Gasification technology can effectively realize energy recovery from municipal solid waste(MSW)to reduce its negative impact on the ***,ammonia,as a pollutant derived from MSW gasification,needs to be treated because its emission is considered harmful to *** work aims to decompose the NH3 pollutant from MSW gasification by an in-situ catalytic *** MSW sample is composed of rice,paper,polystyrene granules,rubber gloves,textile and wood ***–M(M=Co,Fe,Zn)bimetallic catalysts supported on sewage sludge-derived biochar(SSC)were prepared by co-impregnation method and further characterized by X-ray diffraction,N2 isothermal adsorption,scanning electron microscopy,transmission electron microscopy and NH3 temperature programmed *** to the experiments,the catalysts were first homogeneously mixed with the MSW sample,and then in-situ catalytic tests were conducted in a horizontal fixed-bed *** effect of the second metal(Co,Fe,Zn)on the catalytic performance was compared to screen the best Ni-M *** was found that the Ni–Co/SSC catalyst had the best activity toward NH3 decomposition,whose decomposition rate reached 40.21%at 650℃.The best catalytic performance of Ni–Co/SSC can be explained by its smaller Ni particle size that facilitates the dispersion of active sites as well as the addition of Co reducing the energy barrier for the associative decomposition of NH species during the NH3 decomposition ***,the activity of Ni–Co/SSC increased from 450℃to 700℃as the NH3 decomposition reaction was endothermic.

关键词： Ammonia decomposition Municipal solid waste Gasification In-situ catalysis Ni-based catalyst Biochar

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Attentive Neighborhood Feature Augmentation for Semi-supervised Learning

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Intelligent Automation & Soft Computing 2023年第8期37卷 1753-1771页

作者： Qi Liu Jing Li Xianmin Wang Wenpeng Zhao School of Computer Science and Cyber Engineering Guangzhou UniversityGuangzhou510002China Fujian Provincial Key Laboratory of Information Processing and Intelligent Control Minjiang UniversityFuzhou350121China

Recent state-of-the-art semi-supervised learning(SSL)methods usually use data augmentations as core *** methods,however,are limited to simple transformations such as the augmentations under the instance’s naive representations or the augmentations under the instance’s semantic *** tackle this problem,we offer a unique insight into data augmentations and propose a novel data-augmentation-based semi-supervised learning method,called Attentive Neighborhood Feature Aug-mentation(ANFA).The motivation of our method lies in the observation that the relationship between the given feature and its neighborhood may contribute to constructing more reliable transformations for the data,and further facilitating the classifier to distinguish the ambiguous features from the low-dense ***,we first project the labeled and unlabeled data points into an embedding space and then construct a neighbor graph that serves as a similarity measure based on the similar representations in the embedding ***,we employ an attention mechanism to transform the target features into augmented ones based on the neighbor ***,we formulate a novel semi-supervised loss by encouraging the predictions of the interpolations of augmented features to be consistent with the corresponding interpolations of the predictions of the target *** carried out exper-iments on SVHN and CIFAR-10 benchmark datasets and the experimental results demonstrate that our method outperforms the state-of-the-art methods when the number of labeled examples is limited.

关键词： Semi-supervised learning attention mechanism feature augmentation consistency regularization

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Adaptive FRIT-Based Recursive Robust controller Design Using Forgetting Factors 32

Adaptive FRIT-Based Recursive Robust Controller Design Using...

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32nd Mediterranean Conference on control and Automation, MED 2024

作者： Tsuruhara, Satoshi Ito, Kazuhisa Graduate School of Engineering and Science Functional Control Systems Shibaura Institute of Technology Minuma Saitama3378570 Japan Japan Society for the Promotion of Science Tokyo1020083 Japan Shibaura Institute of Technology Department of Machinery and Control Systems Minuma Saitama3378570 Japan

ISBN: (纸本)9798350395440

Adaptive FRIT (A-FRIT) with exponential for-getting (EF) has been proposed for time-varying systems to improve the data dependence of FRIT, which is a direct data-driven tuning method. However, the EF -based method is not a reliable controller because it can cause significant degradation of the control performance and instability unless the persistent excitation (PE) condition is satisfied. To solve this problem, we propose a new A-FRIT method based on directional forgetting (DF) and exponential resetting that can forget old data without instability regardless of the PE condition. To confirm the effectiveness of the proposed method, we applied it to artificial muscle control with strong asymmetric hysteresis characteristics and evaluated its robust performance against load changes during the experiment. The experimental results show that the proposed method based on DF achieves high control performance and is robust against changes in the characteristics and/or target trajectory. The proposed method is also practical because it does not require system identification, model structure, or prior experimentation. © 2024 IEEE.

关键词： Time varying systems

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Research on The Two-parameter Joint control System of Plasma Discharge Cavity Based on Adaptive PID

Research on The Two-parameter Joint Control System of Plasma...

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2024 International Conference on Advanced control Systems and Automation Technologies, ACSAT 2024

作者： Li, Hao Lei, Fan Zhou, Hui Liu, Zhiwei Shaanxi University of Science & Technology School of Electrical and Control Engineering Shaanxi Xi'an China Shandong University of Technology School of Electrical and Electronic Engineering Zibo255000 China China Academy of Aerospace Science and Innovation Beijing China

ISBN: (纸本)9798331541668

Large area closed RF discharge plasma system has multi-variable, large delay, nonlinear and strong coupling between its control loops. A single-neuron adaptive PID control strategy was proposed to maintain the stability of the plasma discharge cavity. By comparing the ability of traditional PID control and single-neuron adaptive PID control in Simulink, it is concluded that single-neuron adaptive PID control has better stability and dynamic performance. The model of pressure control loop and intake control loop is built, and the target step curve is tracked in the presence of interference to reflect the stability of stable intake and pressure balance of the plasma discharge chamber. © 2024 IEEE.

关键词： Three term control systems

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Porphyrin-based Covalent Organic Polymers with Bimetallic Active Sites for Boosting Photocatalytic CO_(2) Cycloaddition

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Chemical Research in Chinese Universities 2025年第1期41卷 121-130页

作者： YAN Shengrong ZHANG Lan SHI Songhu REN Yanyan LIU Wenhao LI Yujie DUAN Fang LU Shuanglong DU Mingliang CHEN Mingqing Key Laboratory of Synthetic and Biological Colloids Ministry of EducationSchool of Chemical and Material EngineeringJiangnan UniversityWuxi214122P.R.China School of Environmental and Biological Engineering Nantong College of Science and TechnologyNantong226007P.R.China Jiangsu Engineering Research Center of Environmental Functional Materials and Pollution Control Nantong226007P.R.China

The photocatalytic CO_(2) cycloaddition to prepare high value-added chemicals,such as cyclic carbonates(CCs)under mild conditions is an effective strategy to realize carbon ***,through a three-step reaction,the porphyrin-based covalent organic polymer with bimetallic active sites(Fe-COP-Zr)is successfully obtained by coordinating Fe^(2+) and Zr^(4+)with porphyrin and bipyridine(Bpy),*** to excellent photosensitivity of porphyrin moieties,Fe-COP-Zr exhibits outstanding visible light absorption,which is very important for the production of photogenerated ***,Fe-COP-Zr shows high photocatalytic performance towards CO_(2) cycloaddition with a yield of 12.1 mmol/h,which is 6 times higher than that of pure covalent organic polymer(COP)and 3 times higher than that of monometallic *** reason for this excellent photocatalytic CO_(2) cycloaddition performance may be ascribed to the synergistic effect of Fe and Zr *** photogenerated electrons are easily injected into epichlorohydrin(ECH)through Fe—O bonds to form affluent electron transition state,and interact with Zr^(4+) as Lewis acid sites for the ring-opening of ECH,which is the rate-determining step for the visible light boosted chemical fixation of CO_(2) into *** work might provide some insights for design and preparation of COPs with multiple active sites to modulate their photocatalytic activities.

关键词： Photocatalytic CO_(2)cycloaddition Cyclic carbonate Covalent organic polymer Bimetallic active site

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