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A Novel Method for Multi-Function Radar Work Mode Boundary Detection

Progress in Electromagnetics Research C 2025年 153卷 213-218页

作者： Fu, Yuxin Wang, Jiantao Huang, Jie Dang, Tongxin Li, Yiming The National Digital Switching System Engineering and Technological Research and Development Center Zhengzhou450000 China

Work mode boundary detection can provide basic information units for the recognition of consecutive work modes in the intercepted multi-function radar (MFR) pulse sequence. The existing boundary detection methods tend to detect false boundaries when the pulse parameters vary drastically within the work mode, such as when the pulse repetition interval (PRI) modulation type is stagger or agile. To address the issue of over-detection of the work mode transition boundary, a new work mode boundary detection method is proposed based on the arc crossings (AC). It utilizes AC to quantify and annotate the similarities within MFR work modes. Without relying on prior knowledge, it can accurately capture the structural characteristics of the boundary transition and effectively adapt to different pulse parameter modulation types. The experimental results show that it reduces the segmentation probabilistic error by 8.7% and false alarm rate by 19.85% compared to the baseline algorithm. © 2025, Electromagnetics Academy. All rights reserved.

关键词： Tracking radar

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Research on Collaborative Aerial Detection Threat Assessment Method Based on Intuitive Fuzzy Reasoning and Three-way Decision 24

Research on Collaborative Aerial Detection Threat Assessment...

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8th International Conference on Electronic Information Technology and Computer engineering, EITCE 2024

作者： Zhou, Huan Zhao, Xin Shen, Yue Aviation Engineering School Air Force Engineering University Shaanxi Xi'an China Research Center of Unmanned System Strategy Development Northwestern Polytechnical University Shaanxi Xi'an China

ISBN: (纸本)9798400710094

In response to the challenges of high uncertainty in target threat assessment and weak coordination in situational evaluation in unmanned aerial vehicle (UAV) collaborative aerial detection, this paper designs an aerial detection collaborative threat assessment strategy based on fuzzy three support decision-making, effectively solving the problem of fuzzy information processing in aerial detection threat assessment. Firstly, a fuzzy threat model for aerial detection was established, simplifying the difficulty of the problem. Secondly, a threat degree calculation method is constructed using fuzzy multi-attribute decision-making theory, and a threat assessment classification method is constructed based on the fusion of improved prospect theory and three decision-making methods. This strengthens the evaluation algorithm’s ability to process fuzzy information on the field, making the threat assessment and evaluation system more flexible and effective. Subsequently, based on the single aircraft threat assessment results, a coordinated threat item for aerial detection situation was designed to further enhance the formation coordination attribute of unmanned aerial vehicle autonomous threat assessment. Finally, the effectiveness of the designed method was verified through digital simulation in the presence/absence of collaborative aerial detection scenarios, demonstrating its ability to resist fuzzy interference. © 2024 Copyright held by the owner/author(s).

关键词： Aircraft detection

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A Study of Module Design Method to Suppress the Oscillation Occurs Between Parallel-Connected Power Devices 14

A Study of Module Design Method to Suppress the Oscillation ...

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14th Annual IEEE Applied Power Electronics Conference and Exposition, APEC 2025

作者： Yato, Shinji Sakai, Hiroto Araki, Hideo Shimosako, Shumei Rohm Co. Ltd. System Solutions Engineering Headquarters Kyoto Japan Rohm Co. Ltd. Research and Development Center Kyoto Japan

ISBN: (纸本)9798331516116

The use of power modules with multiple SiC-MOSFETs dies connected in parallel has increased significantly for traction inverter circuits in electric vehicles(xEVs). However, this configuration can cause problems with oscillation between the parallel-connected dies. This study proposes a module design method to suppress the oscillation. This design method is based on the approximate open-loop transfer function between the parallel-connected dies. The validity of the proposed design method was confirmed through simulations and experimental evaluations. © 2025 IEEE.

关键词： Silicon carbide

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Economic feasibility assessment and parameter sensitivity analysis of rainwater harvesting systems in different climatic zones of China

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Water-Energy Nexus 2025年 8卷 6-17页

作者： Xue, Chonghua Xiong, Feng Li, Junqi Li, Xiaojing Li, Jing Wang, Yu Li, Xiangyu Cui, Ziyu Key Laboratory of Urban Stormwater System and Water Environment Ministry of Education Beijing University of Civil Engineering and Architecture Beijing100044 China Beijing Energy Conservation & Sustainable Urban and Rural Development Provincial and Ministry Co-Construction Collaboration Innovation Center Beijing100044 China Urban Water Affairs and Engineering Research Branch of China Academy of Urban Planning and Design Beijing100044 China

Rainwater is an important non-traditional water resource, and the economic benefits of rainwater harvesting and utilization vary considerably across different climatic conditions. This paper constructs typical rainwater harvesting (RWH) models based on road watering and green space watering reuse pathways, as well as typical flat water year and cistern emptying time in three distinct climate zones of China: Urumqi (located in a semi-arid area), Baoding (located in a semi-humid area), and Shantou (located in a humid area). Using the Infoworks ICM model, long-term simulations (30 years) were conducted to evaluate the economic advantages of rainwater utilization across these climate zones. The Particle Swarm Optimization (PSO) was employed to optimize the cistern volume by integrating Net Present Value (NPV) and Benefit Cost Ratio (BCR). Additionally, multiple nonlinear regression analyses were employed to quantify the relationship between various catchment subsurfaces and the optimal reservoir volume. Sensitivity analyses, including Sobol sensitivity analysis, were performed for parameters such as subsurface characteristics, water price, discount rate, and number of days for emptying the impoundment. The study results indicated that the change curves of NPV and BCR in all three cities exhibit an increasing and then decreasing trend with the increase of reservoir volume under different reservoir setup scenarios. The optimal volume of the reservoir could be articulated through the fitting equation that relates the green space ratio to the road ratio. The discount rate and water price significantly impacted the optimal volume of storage tanks, with the sensitivity of the parameter of the number of days of emptying of the storage tanks to the optimal volume being greater in Shantou, a city in a high humid area. Conversely, in Urumqi, a semi-arid area, the variation of the parameter of greenland rate had a greater sensitivity to the volume of storage tanks. These findings

关键词： Sensitivity analysis

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Finite element analysis and experimental verification of the mechanical performance of a novel easy-to-splice mechanical coupler

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Computers and Concrete 2025年第2期35卷 127-136页

作者： Chung, Sukhwan Jang, Seongmin Seo, Ildong Lee, Nakyoung Chung, Wanjin Joun, Mansoo MFRC Research and Development Center 1209-A 12 Dongbu-ro 169beng-gil Gyeongsangnam-do Jinju-si52818 Korea Republic of Dae Jung Metal Co. Ltd Research and Development Center 26-62 Sangdong-ro 375ben-gil Sngdong-myeon Gyeongsangnam-do Gimhae-si50805 Korea Republic of Department of Mechanical System Design Engineering Seoul National University of Science and Technology 232 Gongneung-ro Nowon-gu Seoul01811 Korea Republic of Engineering Research Institute School of Mechanical Engineering Gyeongsang National University 103-403 501 Jinju-daero Gyeongsangnam-do Jinju-si52828 Korea Republic of

A novel easy-to-splice mechanical coupler (EtSMC) involving a sleeve, two caps, two racks, two rack guides, and two springs is introduced;this coupler easily and tightly connects two rebars through a simple manual operation (without any tool) on a construction site. The mechanical performance (including the pull force/stroke curve of the EtSMC assembly) is experimentally examined via tensile testing in air. A finite element analysis (FEA) model that minimizes simplification of the conceptual design is presented;the spring reaction is assumed to be mechanically symmetrical. The experimental tensile test is numerically analyzed using a fully implicit elastoplastic FEA function and a multi-body treatment scheme based on the tetrahedral MINI-element technique. The predictions are in qualitatively good agreement with the experimental data in terms of both the pull force/stroke curve and the damaged regions of the racks and rack guides. Small differences between the curves can be attributed to some experimental slip between parts. Copyright © 2025 Techno-Press, Ltd.

关键词： Tensile testing

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Effects of Different Fertilization Treatments on the Growth,Quality,and Microbial Community Structure of Grona styracifolia

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Phyton-International Journal of Experimental Botany 2025年第3期94卷 843-860页

作者： Bingbing Zhang Minghao Li Xiaoli Huang Siqi Zheng Guorong Lai Quan Yang Xiaomin Tang School of Chinese Materia Medica Guangdong Pharmaceutical UniversityGuangzhou510006China Guangdong Provincial Research Center on Good Agricultural Practice&Comprehensive Agricultural Development Engineering Technology of Cantonese Medicinal Materials Guangzhou510006China Comprehensive Experimental Station of Guangzhou Chinese Material MedicaChina Agriculture Research System(CARS-21-16)Guangzhou510006China Key Laboratory of Production&Development of Cantonese Medicinal Materials State Administration of Traditional Chinese MedicineGuangzhou510006China

Fertilization is essential for high yield and quality in Chinese *** styracifolia(Osbeck)***,a distinctive medicinal plant in the Lingnan region,currently encounters cultivation issues stemming from the overuse of chemical *** organic and microbial fertilizers presents a sustainable solution for its cultivation *** study compared a no-fertilization control group with eight treatment groups using various concentrations of compound,organic,compound microbial,and Bacillus amyloliquefaciens fertilizers to evaluate their effects on *** and soil microbial *** results demonstrated that the different fertilization treatments significantly enhanced plant growth and quality of ***,while also increasing the activity of soil enzymes such as urease,invertase,and cellulase,as well as the levels of effective soil *** affiliation function analysis demonstrated that applying Bacillus amyloliquefaciens fertilizer(15 g/kg)exhibited optimal performance in enhancing the growth of *** and improving soil fertility *** sequencing of the soil indicated that under the application of Bacillus amyloliquefaciens fertilizer(15 g/kg),the relative abundance of Actinobacteria and Ascomycota increased significantly by 27.42%and 74.91%,respectively(p<0.05).The application of microbial-based fertilizers significantly enriched the abundance of ***,LEfSe analysis identified distinct microbial biomarkers associated with different ***,redundancy analysis identified Invertase and available potassium(AK)as the primary drivers of soil bacterial and fungal community structures,*** study demonstrated that the application of Bacillus amyloliquefaciens fertilizer(15 g/kg)significantly enhanced soil fertility and restructured microbial *** improvements led to increased yield and quality of ***,providing a s

关键词： Grona styracifolia(Osbeck)H.Ohashi growth active ingredients enzyme activity soil microorganisms

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Research on New Type Secondary Inerter Suspension Damping Devices for Rail Vehicles Based on Low Frequency and High Frequency Track Excitation 3

Research on New Type Secondary Inerter Suspension Damping De...

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3rd International Conference on Rail Transportation, ICRT 2024

作者： Dilai, C. Gengchen, S. Chenxu, L. Rui, S. Lixia, S. School of Railway Transportation Shanghai Institute of Technology Shanghai China China Railway Test and Certification Center Limited Beijing China Standards and Metrology Research Institute of China Academy of Railway Sciences Corporation Limited Beijing China Railway Science and Technology Research and Development Center of China Academy of Railway Sciences Corporation Limited Beijing China Wheel-Rail System Laboratory National Engineering Research Center of System Technology for High-Speed Railway and Urban Rail Transit Beijing China

ISBN: (数字)9780784485941

ISBN: (纸本)9780784485941

Different types of secondary inerter suspension vibration damping devices are established set on the Matlab platform and compare and analyzes the dynamic indicators of vehicle operation, selecting the secondary inertial suspension damping device that significantly optimizes both the quality of vehicle operation and the suppression of low-frequency and high-frequency body sway. The research results indicate that for vehicle low-frequency swaying, all four types of new dual-system inertial damping suspension devices have an optimizing effect, with Condition S5 showing the most significant improvement. Compared to the traditional suspension damping device's lateral acceleration of 1.62 m/s2, it has been optimized by 57%, achieving 0.7 m/s2. For vehicle high-frequency swaying, Condition S5 again showing the most notable improvement. Relative to the traditional suspension damping device's lateral acceleration of 0.87 m/s2, it has been optimized by 52%, reaching 0.41 m/s2. After optimizing the parameters for various conditions, the results indicate that Condition S5, with an inertial coefficient of 5,000 kg, provides the best optimization effect on the stability of the vehicle's operation. © ASCE.

关键词： Automobile suspensions

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Variable stiffness design optimization of fiber-reinforced composite laminates with regular and irregular holes considering fiber continuity for additive manufacturing

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Chinese Journal of Aeronautics 2025年第3期38卷 334-354页

作者： Yi LIU Zunyi DUAN Chunping ZHOU Yuan SI Chenxi GUAN Yi XIONG Bin XU Jun YAN Jihong ZHU School of Mechanics Civil Engineering&ArchitectureNorthwestern Polytechnical UniversityXi’an 710072China Research&Development Institute of Northwestern Polytechnical University in Shenzhen Shenzhen 518063China Key Lab for Airborne Hi-performance Electro-magnetic Window RISACJinan 130012China School of System Design and Intelligent Manufacturing Southern University of Science and TechnologyShenzhen 518055China State Key Laboratory of Structural Analysis for Industrial Equipment Department of Engineering MechanicsInternational Research Center for Computational MechanicsDalian University of TechnologyDalian 116024China State IJR Center of Aerospace Design and Additive Manufacturing MIIT Lab of Metal Additive Manufacturing and Innovative DesignNorthwestern Polytechnical UniversityXi’an 710072China

Fiber-reinforced composites are an ideal material for the lightweight design of aerospace structures. Especially in recent years, with the rapid development of composite additive manufacturing technology, the design optimization of variable stiffness of fiber-reinforced composite laminates has attracted widespread attention from scholars and industry. In these aerospace composite structures, numerous cutout panels and shells serve as access points for maintaining electrical, fuel, and hydraulic systems. The traditional fiber-reinforced composite laminate subtractive drilling manufacturing inevitably faces the problems of interlayer delamination, fiber fracture, and burr of the laminate. Continuous fiber additive manufacturing technology offers the potential for integrated design optimization and manufacturing with high structural performance. Considering the integration of design and manufacturability in continuous fiber additive manufacturing, the paper proposes linear and nonlinear filtering strategies based on the Normal Distribution Fiber Optimization (NDFO) material interpolation scheme to overcome the challenge of discrete fiber optimization results, which are difficult to apply directly to continuous fiber additive manufacturing. With minimizing structural compliance as the objective function, the proposed approach provides a strategy to achieve continuity of discrete fiber paths in the variable stiffness design optimization of composite laminates with regular and irregular holes. In the variable stiffness design optimization model, the number of candidate fiber laying angles in the NDFO material interpolation scheme is considered as design variable. The sensitivity information of structural compliance with respect to the number of candidate fiber laying angles is obtained using the analytical sensitivity analysis method. Based on the proposed variable stiffness design optimization method for complex perforated composite laminates, the numerical examples cons

关键词： Variable stiffness composite laminates Discrete material interpolation scheme Normal distribution fiber optimization Discrete fiber continuous filtering strategy Additive manufacturing of composite laminates

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WTConv-Adapter: Wavelet Transform Convolution Adapter for Parameter Efficient Transfer Learning of Object Detection ConvNets 8

WTConv-Adapter: Wavelet Transform Convolution Adapter for Pa...

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8th International Conference on Video and Image Processing, ICVIP 2024

作者： Jia, Guanwei Xu, Lizhi Zhu, Liqiang Science and Technology Department Guoneng Shuohuang Railway Development Co. Ltd. Cangzhou062350 China School of Mechanical Electronic and Control Engineering Beijing Jiaotong University Beijing100044 China Frontiers Science Center for Smart High-Speed Railway System Beijing Jiaotong University Beijing100044 China

ISBN: (数字)9781510689244

ISBN: (纸本)9781510689237

In the field of natural language processing, utilizing large-scale pre-trained foundational models for parameter-efficient transfer has become a standard paradigm to enhance training efficiency and model performance. However, its application in computer vision, particularly in object detection tasks, remains to be further explored. This study introduces WTConv-Adapter, a parameter-efficient transfer module for convolutional networks in object detection. The module integrates traditional convolution with wavelet transform convolution, achieving a lightweight design while maintaining a large receptive field and multi-frequency response capabilities. Experiments on object detection under complex lighting conditions demonstrate the significant advantages of introducing wavelet convolution in parallel, leading to improved detection performance. Additionally, its transferability was tested and compared with backbone freezing, full fine-tuning, and Conv-Adapter, showing favorable results in both parameter efficiency and performance (achieving a 1.8% performance improvement over full fine-tuning with fewer parameters and training iterations). Moreover, its performance in the presence of pre-processing networks was evaluated, revealing strong adaptability to changes in input feature distributions. © 2025 SPIE.

关键词： Wavelet transforms

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A Study of Module Design Method to Suppress the Oscillation Occurs Between Parallel-Connected Power Devices

A Study of Module Design Method to Suppress the Oscillation ...

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Annual IEEE Conference on Applied Power Electronics Conference and Exposition (APEC)

作者： Shinji Yato Hiroto Sakai Hideo Araki Shumei Shimosako System Solutions Engineering Headquarters ROHM Co. Ltd. Kyoto Japan Research and Development Center ROHM Co. Ltd. Kyoto Japan

ISBN: (数字)9798331516116

ISBN: (纸本)9798331516123

关键词： MOSFET Silicon carbide Design methodology Circuits Multichip modules Transfer functions Switches Electric vehicles Inverters Oscillators

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