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3rd IEEE International Conference on Electronic Communications, Internet of Things and Big Data, ICEIB 2023

作者： Wen, Yingzi He, Xin Lv, Dawei Li, Fei College of Nuclear Technology and Automation Engineering Chengdu University of Technology Chengdu China College of Management Science Chengdu University of Technology Chengdu China College of Nuclear Technology and Automation Engineering Chengdu University of Technology China Applied Nuclear Technology in Geosciences Key Laboratory of Sichuan Province Chengdu China

ISBN: (纸本)9798350333862

Gradient boosted decision tree is a supervised learning algorithm model constructed by improving tree structure, replacing residual with gradient and using the concept of entropy in informatics. GBDT produces classification bias due to the imbalance of the sample. Therefore, we propose a way to accelerate the output quality of a decision tree by combining linear regression and GBDT and preprocessing sample data through linear regression before training. In the experiment, the new algorithm is applied to the nonlinear classification decision. It is found that the regression coefficient of the apportion of independent directors is 0.034, the regression coefficient is 0.712, the regression coefficient for table size is 0.197, the regression coefficient for the size of the board of directors is -0.197, and the regression coefficient for the share of institutional investors is -0.018. The regression coefficient for the institutional investor share is -0.018. It is found that this algorithm effectively improves classification accuracy and has good practical value. © 2023 IEEE.

关键词： Multiple linear regression

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Neural Network-Based Analysis of Local Extreme Cold Events in the Context of Global Warming: Causes and Predictions 5

Neural Network-Based Analysis of Local Extreme Cold Events i...

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5th International Conference on Artificial Intelligence and Computer engineering, ICAICE 2024

作者： Zhang, Mao Peng, Ying Zeng, Yuming Chen, Yabing The College of Nuclear Technology and Automation Engineering Chengdu University of Technology Sichuan Chengdu610059 China

ISBN: (纸本)9798331528911

Global warming is a pressing issue, accompanied by both rising temperatures and local extreme cold events. This paper analyzes the relationship between global warming and extreme weather events through quantitative analysis of climate data. Focusing on the United States as a representative of regions experiencing extreme cold, a neural network model is developed to predict these events. Results indicate that rising global temperatures positively correlate with increased snowfall in the US, while negatively impacting US winter temperatures. This suggests that as global average temperatures increase, US winters become colder with more snow. The study concludes that global warming and local extreme cold events are not contradictory but strongly correlated phenomena. © 2024 IEEE.

关键词： Extreme weather

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Design of a new in situ monitoring device for aquaculture 3

Design of a new in situ monitoring device for aquaculture

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3rd International Conference on Machine Vision, Automatic Identification, and Detection, MVAID 2024

作者： Bian, Zhenxue Deng, Yongkang Lu, Bingshuo Liu, Chang Hu, Chuanhao College of Nuclear Technology and Automation Engineering Chengdu University of Technology Sichuan Chengdu610059 China

ISBN: (纸本)9781510681880

Aiming at the problems such as few probes, limited detection area and lack of nuclear radiation detection module in existing aquaculture monitoring devices, a new type of aquaculture in Situ monitoring device is designed. Based on the innovation of six-probe retractable mechanical structure, the cerium bromide scintillator detector is added compared with the traditional device, and the aquaculture monitoring sensor with six parameters is integrated to realize the three-dimensional monitoring of multi-parameter water quality information in the aquaculture area, ensuring the safety and reliability of the water quality in the aquaculture area. © 2024 SPIE.

关键词： Probes

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Suppression of stimulated Brillouin and Raman scatterings using an alternating frequency laser and transverse magnetic fields

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Chinese Physics B 2024年第1期33卷 545-553页

作者：程瑞锦李晓旬王清刘德基黄卓明吕帅宇周远志张舒童李雪铭陈祖杰王强刘占军曹莉华郑春阳 Institute of Applied Physics and Computational Mathematics Beijing 100094China HEDPS Center for Applied Physics and Technologyand State Key Laboratory of Nuclear Physics and TechnologySchool of PhysicsPeking UniversityBeijing 100871China HEDPS Center for Applied Physics and Technologyand College of EngineeringPeking UniversityBeijing 100871China

A novel scheme to suppress both stimulated Brillouin scattering(SBS) and stimulated Raman scattering(SRS) by combining an alternating frequency(AF) laser and a transverse magnetic field is proposed. The AF laser allows the laser frequency to change discretely and alternately over time. The suppression of SBS is significant as long as the AF difference is greater than the linear growth rate of SBS or the alternating time of the laser frequency is shorter than the linear growth time of SBS. However, the AF laser proves ineffective in suppressing SRS, which usually has a much higher linear growth rate than SBS. To remedy that, a transverse magnetic field is included to suppress the SRS instability. The electrons trapped in the electron plasma waves(EPWs) of SRS can be accelerated by the surfatron mechanism in a transverse magnetic field and eventually detrapped. While continuously extracting energy from EPWs, the EPWs are dissipated and the kinetic inflation of SRS is suppressed. The one-dimensional particle-in-cell simulation results show that both SBS and SRS can be effectively suppressed by combining the AF laser with a transverse magnetic field with tens of Tesla. The total reflectivity can be dramatically reduced by more than one order of magnitude. These results provide a potential reference for controlling SBS and SRS under the related parameters of inertial confinement fusion.

关键词： stimulated Brillouin scattering stimulated Raman scattering alternating frequency laser transverse magnetic field

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Optimization method of Hadamard coding plate inγ‑ray computational ghost imaging

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nuclear Science and Techniques 2023年第1期34卷 146-156页

作者： Zhi Zhou San‑Gang Li Qing‑Shan Tan Li Yang Ming‑Zhe Liu Ming Wang Lei Wang Yi Cheng College of Nuclear Technology and Automation Engineering Chengdu University of TechnologyChengdu 610059China Applied Nuclear Technology in Geosciences Key Laboratory of Sichuan Province Chengdu University of TechnologyChengdu 610059China Institute of Plasma Physics Hefei Institutes of Physical ScienceChinese Academy of ScienceHefei 230031China University of Science and Technology of China Hefei 230026China

Owing to the constraints on the fabrication ofγ-ray coding plates with many pixels,few studies have been carried out onγ-ray computational ghost ***,the development of coding plates with fewer pixels is essential to achieveγ-ray computational ghost *** on the regional similarity between Hadamard subcoding plates,this study presents an optimization method to reduce the number of pixels of Hadamard coding ***,a moving distance matrix was obtained to describe the regional similarity ***,based on the matrix,we used two ant colony optimization arrangement algorithms to maximize the reuse of pixels in the regional similarity area and obtain new compressed coding *** full sampling,these two algorithms improved the pixel utilization of the coding plate,and the compression ratio values were 54.2%and 58.9%,*** addition,three undersampled sequences(the Harr,Russian dolls,and cake-cutting sequences)with different sampling rates were tested and *** different sampling rates,our method reduced the number of pixels of all three sequences,especially for the Russian dolls and cake-cutting ***,our method can reduce the number of pixels,manufacturing cost,and difficulty of the coding plate,which is beneficial for the implementation and application ofγ-ray computational ghost imaging.

关键词： γ-ray computational ghost imaging Regional similarity Hadamard coding plate

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Targets capture by distributed active swarms via bio-inspired reinforcement learning

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Science China(Physics,Mechanics & Astronomy) 2025年第1期68卷 206-217页

作者： Kun Xu Yue Li Jun Sun Shuyuan Du Xinpeng Di Yuguang Yang Bo Li Institute of Biomechanics and Medical Engineering Applied Mechanics LaboratoryDepartment of Engineering MechanicsTsinghua UniversityBeijing 100084China Institute of Nuclear and New Energy Technology Tsinghua UniversityBeijing 100084China Shanghai Aerospace Control Technology Institute Shanghai 201109China Shanghai Key Laboratory of Aerospace Intelligent Control Technology Shanghai 201109China College of Automation Engineering Nanjing University of Aeronautics and AstronauticsNanjing 210016China

Natural swarms arranged from cells to herds are usually decentralized but display intriguing collective intelligence in coordinating individuals across large scales to efficiently achieve their common *** from nature may provide new strategies for controlling collective dynamics of synthetic swarms to accomplish specific ***,we present a bioinspired computational framework that steers distributed active swarms to collectively capture and merge targets via reinforcement *** exploit collective milling structures of natural herds to cage the targets,and adopt a switching control policy inspired by sperms’chiral dynamics to optimize the trajectories of individuals,through which the active swarms can selforganize to enclose single or multiple distant targets in a dynamical,adaptive and scalable *** exists a critical swarm size,beyond which the excessive competition between agents would generate large mechanical forces,leading to capture instability but enabling the transition from short-distance to long-distance merging capture of multiple *** work provides physical insights into distributed active swarms and could offer a multilevel,decentralized strategy toward controlling swarm robotics in wide applications such as bio-medical devices,machine immunity,and target clearance.

关键词： swarm intelligence robotics multi-tasks artificial intelligence bionics

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Experimental Study of Flame Impedance Characteristics under 35 kV Line 2

Experimental Study of Flame Impedance Characteristics under ...

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2nd Asia Power and Electrical technology Conference, APET 2023

作者： Meng, Wang Tianxiang, Chen Chaoxu, Zeng Sen, Yang Longshan, Yang Long, Chen College of Nuclear Technology and Automation Engineering Chengdu University of Technology Chengdu China

ISBN: (纸本)9798350359428

Hill fire hazards on transmission and distribution lines due to various factors affect the safe operation of the lines. The current study does not consider the effect of ground capacitance current on fire impedance characteristics under the line. This paper takes 35 kV line under the mountain fire flame impedance characteristics as the test object, build different to ground capacitance of the mountain fire test platform, put forward the mountain fire ground fault theoretical model, through simulated line under the mountain fire test on the flame completely bridged gap order eucalyptus, shrubs and straw flame impedance characteristics of curve fitting, verify the vegetation mountain fire triggered by the line single-phase grounding is a high resistance ground, research and analysis of the vegetation flame impedance characteristics of the impact mechanism. Experimental research shows that the occurrence of mountain fire fault line fault degree and ground capacitance current is positively correlated;flame temperature is one of the main factors affecting flame impedance, flame impedance and flame temperature does not strictly show a negative correlation;different vegetation types triggered by mountain fire flame impedance characteristics vary greatly, arc discharge will seriously weaken the vegetation flame insulation characteristics, flame completely bridged gap stage before and mid-term flame impedance of the main influencing factors are flame temperature and flame height, flame completely bridged gap stage late flame impedance of the main influencing factors into the ash content of vegetation. The study of vegetation flame impedance characteristics can provide technical reference for transmission and distribution lines to prevent line failures caused by hill fires. © 2023 IEEE.

关键词： Fires

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Study on the Influence of Temperature on Tanδ Measurement of 110kV Cascade Voltage Transformer 2

Study on the Influence of Temperature on Tanδ Measurement o...

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2nd Asia Power and Electrical technology Conference, APET 2023

作者： Longshan, Yang Tianxiang, Chen Shuyue, Wang Xun, Wang College of Nuclear Technology and Automation Engineering Chengdu University of Technology Chengdu China

ISBN: (纸本)9798350359428

Cascade voltage transformers (hereinafter referred to as CTV) are widely used in power grids, and a good insulation condition is a prerequisite for their safe and reliable operation. 110kV CTV tan δ can be affected by changes in environmental factors (such as temperature and humidity), and sometimes the tanδ can be abnormal or even fail to reflect the actual state of the equipment. This paper takes a JCC6-110 CTV which has been operated for many years as the research object, and makes a comprehensive and detailed study on the influence of temperature on CTV tanδ, and researches the change of CTV tanδ under different temperature conditions, proposes the CTV insulation equivalent circuit model, obtains tanδ and capacity data through different wiring methods and derives the model parameters, and establishes the insulation equivalent circuit model influenced by temperature factors. The insulation equivalent circuit model with the influence of temperature factors is proposed, and the method of correcting tanδ to the standard atmospheric conditions is proposed. The model was simulated using MATLAB/Simulink software to verify the correctness of the insulation equivalent circuit model considering the effect of temperature on tanδ under fault conditions, and the model can be applied to the conversion and correction of the effect of temperature on CTV tanδ during field testing. © 2023 IEEE.

关键词： Timing circuits

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Experimental Study on the Effect of Humidity on the Tanδ of 110kV Oil-Immersed Current Transformer

Experimental Study on the Effect of Humidity on the Tanδ of...

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2023 Power Electronics and Power System Conference, PEPSC 2023

作者： Chen, Long Chen, Tianxiang Wang, Xun Xiang, Xiaolei College of Nuclear Technology and Automation Engineering Chengdu University of Technology Chengdu China

ISBN: (纸本)9798350341294

As an important parameter characterizing the insulation performance of high-voltage equipment, tan delta is commonly used in the regular maintenance and fault inspection of high-voltage equipment. During the tan delta measurement of high-voltage equipment, it is found that the ambient humidity will affect the measurement results. In order to avoid this effect leading to the misjudgment of the insulation condition of the equipment. In this paper, a current transformer model LB6-110, which has been operated for more than 10 years, is taken as the test object, and the method of controlling the humidity change is adopted. Through five different test wiring methods to measure tanδ, summarize and analyze the effect of humidity on tan delta under different test wiring, and put forward the optimal wiring method to avoid the effect of humidity. © 2023 IEEE.

关键词： Electric instrument transformers

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Research on Fault of Vegetated Contact Phase of Low Voltage Distribution Lines 2

Research on Fault of Vegetated Contact Phase of Low Voltage ...

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2nd Asia Power and Electrical technology Conference, APET 2023

作者： Long, Chen Tian-Xiang, Chen Long-Shan, Yang Meng, Wang Chao-Xu, Zeng Sen, Yang College of Nuclear Technology and Automation Engineering Chengdu University of Technology Chengdu China

ISBN: (纸本)9798350359428

In order to study whether the vegetation touching single-phase conductor faults of low voltage distribution lines can lead to hill fires, a 400V low voltage bare conductor simulated tree line fault experimental platform was built. The possibility of vegetation ignition caused by vegetation contact fault in low voltage distribution lines is studied by analyzing the leakage current flowing through vegetation., the temperature rise of vegetation and the traces of carbonization on the surface. The results show that the bamboo with high water content touches the single-phase conductor fault temperature rise obviously., there are obvious charring traces near the fault point in the test., and the maximum temperature reaches 95.3 °C, the maximum leakage current is 180mA., and there is no discharge phenomenon in the test. High water content will limit the maximum temperature near the fault point to be less than the boiling point of water., and the temperature rise will accelerate the loss of water., leading to a decrease in leakage current., and eventually the temperature drop at the fault point gradually stabilizes., indicating that a single-phase conductor fault on a low voltage distribution line with vegetation touching it will not cause a fire. The results of the study are of great significance for the prevention of hill fires on low voltage distribution lines through forested areas. © 2023 IEEE.

关键词： Fires

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