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6th IEEE International Electrical and Energy Conference, CIEEC 2023

作者： Luo, Di Liu, Xiaohu Wang, Ruitian Li, Xin Naval University of Engineering National Key Laboratory of Science Technology on Vessel Integrated Power System Wuhan China Military Electrical Science and Technology Institute Naval University of Engineering Wuhan China

ISBN: (纸本)9798350346671

GaN devices offer superior performance over Si devices, such as higher mobility, breakdown voltage, switching speed and per-width power density. In the future, GaN devices are expected to surpass Si devices in almost all performance indicators, thereby achieving high-speed and efficient power electronic systems (PES). The model of GaN device is a useful and necessary tool to analyze and evaluate its impact on circuit and system performance, which can help researchers design new PES. This paper reviews latest advances on the models of GaN power devices, and discusses the working principles of GaN, the classification and contributions of GaN model, for understanding the significance of these recent developments. In addition, this paper also considers the challenges and problems encountered in the modeling and application of GaN devices, such as self-heating effect, trap effect and short channel effect, providing guidance for future modeling. This review helps readers understand and use the GaN model to achieve more effective design of GaN-based converters. © 2023 IEEE.

关键词： Gallium nitride

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RESEARCH ON THE FILM THICKNESS CHARACTERISTICS OF JET CONDENSER NOZZLE 31

RESEARCH ON THE FILM THICKNESS CHARACTERISTICS OF JET CONDEN...

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2024 31st International Conference on Nuclear Engineering, ICONE 2024

作者： Weiyu, Chu Chonghai, Huang Qi, Xiao Zhaoming, Meng Yilin, Fu Heilongjiang Provincial Key Laboratory of Nuclear Power System & Equipment Harbin Engineering University Harbin China Science and Technology on Thermal Energy and Power Laboratory Wuhan Second Ship Design and Research Institute Wuhan China

ISBN: (纸本)9780791888261

Owing to the expansive applicability of jet condensers across diverse sectors, juxtaposed with the paucity of scholarly investigation into the morphological characteristics of the condenser liquid film, the present study zeroes in on the determinants of film thickness attributable to jet condenser nozzles. In pursuit of this objective, we engineered and actualized a visualization experimental apparatus tailored for the meticulous examination of the film-forming propensities of such nozzles. Subsequent experimental endeavors focused on the dynamics of nozzle-induced spray film genesis. Leveraging bespoke measurement techniques, this inquiry delved into the influence of varied parameters including flow rate and nozzle angle, on the film thickness engendered by the nozzles, thereby elucidating discernible trends in the phenotypical attributes of nozzle film thickness. Findings from this research suggest a proportional relationship between film thickness and flow rate, and an inverse correlation between nozzle diameter and film thickness. These insights furnish empirical underpinnings for the refinement of nozzle configurations in jet condensers, thereby contributing to the enhancement of their operational efficacy. © 2024 by ASME.

关键词： Film thickness

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A Unified Framework of Stabilized Finite Element Method for Solving the Boltzmann Transport Equation

A Unified Framework of Stabilized Finite Element Method for ...

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2022 International Conference on Physics of reactors, PHYSOR 2022

作者： Cao, Liangzhi Fang, Chao Li, Yifei He, Qingming School of Nuclear Science and Technology Xi'an Jiaotong University Shaanxi Xi'an710049 China Science and Technology on Reactor System Design Technology Laboratory Nuclear Power Institute of China Chengdu610041 China

ISBN: (纸本)9780894487873

This paper presents a unified framework of stabilized finite element method for solving the Boltzmann transport equation. Unlike the traditional Petrov-Galerkin finite element method which modify the test function to construct the stabilization term, we derive the stabilization methods from the standard Galerkin weak form with Sub-grid scale model. The basic idea of this method is to decompose the unknowns into its numerical solution and residual, with an approximation for the residual and embed it in the Galerkin weak form yields a stabilized variational formula. Different approximations of the residual lead to different stabilization methods, all the frequently used stabilized methods, including the Streamline Upwinding Petrov-Galerkin (SUPG) method, Galerkin/Least-Square (GLS) method, and Algebraic Sub-Grid Scale (ASGS) method can be obtained from this framework. The similarities and differences of the different approximations are compared in this paper. The numerical results show that the behaviors of the different methods are similar with the same stabilization parameter, and all these stabilized techniques can obtain correct and stable solution. © 2022 Proceedings of the International Conference on Physics of reactors, PHYSOR 2022. All Rights Reserved.

关键词： Approximate residual equation Boltzmann transport equation Stabilization parameter Stabilized finite element methods

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Flexible liquid metal electromagnetic shielding materials

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science China(Technological sciences) 2023年第10期66卷 2757-2774页

作者： BAI YunLong ZHANG Jie ZHANG MingKuan RAO Wei Key Laboratory of Cryogenics Technical Institute of Physics and ChemistryChinese Academy of SciencesBeijing 100190China Beijing Key Lab of CryoBiomedical Engineering and Key Lab of Cryogenics Technical Institute of Physics and ChemistryChinese Academy of SciencesBeijing 100190China School of Engineering Science University of Chinese Academy of SciencesBeijing 100039China School of Future Technology University of Chinese Academy of SciencesBeijing 100049China Tianjin Key Laboratory for Advanced Mechatronic System Design and Intelligent Control School of Mechanical EngineeringTianjin University of TechnologyTianjin 300384China National Demonstration Center for Experimental Mechanical and Electrical Engineering Education Tianjin University of TechnologyTianjin 300384China

The demand for flexible shielding has been rapidly growing in recent *** materials using solid metals,carbon materials,or MXenes as shielding units usually have difficulty in combining high shielding and flexibility(stretching and bending characteristics),and thus they gradually fail to meet the shielding needs of flexible ***,shielding materials with both flexibility and high conductivity are urgent to fill this ***-based room temperature liquid metal(LM)is an emerging functional material with a low melting point,low viscosity,low modulus,and easy ***,due to wettability and compatibility issues,it is difficult to apply bulk LMs directly in the field of electromagnetic shielding(EMS).The article reviews the fabrication methods,performance,and applications of LMs EMS materials from three perspectives:Macroscopic LMs,micro/nano-LMs,and LM-based *** gallium-based liquid EMS materials demonstrate the characteristics of high shielding performance with stretchability and a wide shielding *** this review,different types of gallium-based LM materials are described from macroscopic to microscopic,from liquid to semi-solid,from high density to low density,from room temperature to ultra-low temperature,and from monolayer structure to multilayer *** prospect of LM materials as amorphous high-performance EMS materials is demonstrated in various applications,such as mobile communication,astronomical observation,radar,and medical detection,showing tremendous potential in the EMS field.

关键词： liquid metal electromagnetic shielding flexibility

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Nonreciprocity of energy transfer in a nonlinear asymmetric oscillator system with various vibration states

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Applied Mathematics and Mechanics(English Edition) 2023年第5期44卷 727-744页

作者： Jian’en CHEN Jianling LI Minghui YAO Jun LIU Jianhua ZHANG Min SUN Tianjin Key Laboratory for Advanced Mechatronic System Design and Intelligent Control School of Mechanical EngineeringTianjin University of TechnologyTianjin 300384China National Demonstration Center for Experimental Mechanical and Electrical Engineering Education Tianjin University of TechnologyTianjin 300384China School of Aeronautics and Astronautics Tiangong UniversityTianjin 300387China Agricultural Information Institute of Chinese Academy of Agricultural Sciences Key Laboratory of Agricultural Big DataMinistry of Agriculture and Rural AffairsBeijing 100081China School of Science Tianjin Chengjian UniversityTianjin 300384China

The nonreciprocity of energy transfer is constructed in a nonlinear asymmetric oscillator system that comprises two nonlinear oscillators with different parameters placed between two identical linear *** slow-flow equation of the system is derived by the complexification-averaging *** semi-analytical solutions to this equation are obtained by the least squares method,which are compared with the numerical solutions obtained by the Runge-Kutta *** distribution of the average energy in the system is studied under periodic and chaotic vibration states,and the energy transfer along two opposite directions is *** effect of the excitation amplitude on the nonreciprocity of the system producing the periodic responses is analyzed,where a three-stage energy transfer phenomenon is *** the first stage,the energy transfer along the two opposite directions is approximately equal,whereas in the second stage,the asymmetric energy transfer is *** energy transfer is also asymmetric in the third stage,but the direction is reversed compared with the second ***,the excitation amplitude for exciting the bifurcation also shows an asymmetric *** vibrations are generated around the resonant frequency,irrespective of which linear oscillator is *** excitation threshold of these chaotic vibrations is dependent on the linear oscillator that is being *** addition,the difference between the energy transfer in the two opposite directions is used to further analyze the nonreciprocity in the *** results show that the nonreciprocity significantly depends on the excitation frequency and the excitation amplitude.

关键词： nonreciprocity strong nonlinearity energy transfer chaotic vibration higher branch of response

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A Method for Generating Set of Test Cases for Nuclear Power DCS Combination Based on Contract Model 6th

A Method for Generating Set of Test Cases for Nuclear Power ...

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6th International Conference on Computing, Control, and Industrial Engineering, CCIE 2021

作者： Peng, Beicheng Chen, Zhi Liu, Jie Liu, Zhaojun Computer School University of South China Hengyang421001 China National Key Laboratory of Reactor System Design Technology Nuclear Power Institute of China Chengdu610213 China

ISBN: (纸本)9789811939266

Aiming at the need to solve the problem of complex interaction of parameters and difficulty in determining the combination strength in the combination test of the digital I&C system of nuclear power plants, a method for generating a set of variable strength combination test cases based on a contract model is proposed. First, analyze the relationship between input parameters and output parameters from the constructed contract model, determine the actual interaction relationship of the system, and adopt the variable strength combination test case generation method based on the In-Parameter-Order strategy to achieve full coverage of the actual interaction relationship between components, and use contractual constraints to further reduce the scale of test data. Finally, the algorithm is applied to the test of nuclear power plant core temperature measurement system. The results show that the proposed algorithm has certain advantages in test data scale, coverage and error detection ability. © 2022, The Author(s), under exclusive license to Springer Nature Singapore Pte Ltd.

关键词： Nuclear power plants

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Algorithm and Software Implementation of Track Chain Automatic Assembly for Tracked Vehicle 2nd

Algorithm and Software Implementation of Track Chain Automat...

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2nd International Conference of Mechanical system Dynamics, ICMSD 2023

作者： Huang, Kai Wang, Pingxin Yang, Fufeng Zhou, Lei Institute of Launch Dynamics Nanjing University of Science and Technology No.200 Xiaolingwei Street Nanjing China National Key Laboratory of Complex Multibody System Dynamics Nanjing China

ISBN: (纸本)9789819980475

With the high-speed improvement of computer processing speed and the continuous development of multibody dynamics commercial software, these softwires has been widely used in the analysis and design of high speed tracked vehicle dynamics. Focusing on the complex modelling of the track subsystem, this paper develops an automated algorithm for assembling the track chain. The contact parameters between the track and the ground and wheels can also be defined easily. Compared with the conventional method of adding track plates and track pins singly using generic modules, this approach greatly improves the modeling speed of the tracked vehicle running system. Finally, the reliability of this method is verified by the simulation of an actual tracked vehicle. © The Author(s), under exclusive license to Springer Nature Singapore Pte Ltd. 2024.

关键词： Tracked vehicles

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Simulation and Calculation of Proximity Effect of Coils under Fast Transients 13

Simulation and Calculation of Proximity Effect of Coils unde...

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13th Asia-Pacific International Symposium on Electromagnetic Compatibility and Technical Exhibition, APEMC 2022

作者： Wang, Zongyang Song, Wenchang Xie, Yanzhao He, Xianjian Xi'An Jiaotong University State Key Laboratory of Electrical Insulation and Power Equipment School of Electrical Engineering Xi'an China Nuclear Power Institute of China Science and Technology on Reactor System Design Technology Laboratory Chengdu China

ISBN: (数字)9781665416719

ISBN: (纸本)9781665416719

Proximity effect over a broad frequency range plays an important role in analyzing transients in the coils. The frequency dependent characteristic makes proximity effect a tricky problem. This paper first introduces FEM simulation to calculate the complex impedance of proximity effect and compares different axial arrangement of two conductors, shows a good agreement. In addition, different formulas are used to compare their results with FEM simulation to verify their accuracy. Kane formula and Modified formula can both get relatively accurate results. Considering the accuracy and conciseness of Modified formula, it is preferred in the analysis of transients in coils. © 2022 IEEE.

关键词： Finite element method

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Structural design and Experimental Study of a Rotary Magnetorheological Damper with Higher Torque to Volume Ratio 2nd

Structural Design and Experimental Study of a Rotary Magneto...

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2nd International Conference of Mechanical system Dynamics, ICMSD 2023

作者： Yan, Xinghua Zhu, Wei Institute of Launch Dynamics Nanjing University of Science and Technology No.200 Xiaolingwei Street Nanjing China National Key Laboratory of Complex Multibody System Dynamics Nanjing China

ISBN: (纸本)9789819980475

A rotary magnetorheological damper with higher torque to volume ratio based on shear and flow mixing was designed. This structure adopts a mixed working mode of shear and flow, fully combining the advantages of the two working modes. A damping torque mechanical model of a rotary magnetorheological damper was established based on the parallel plate flow model of fluid and the Bingham model of magnetorheological fluid. And the magnetic circuit was simulated and analyzed using ANSYS, and the mechanical properties were simulated and calculated. The simulation results indicate that the magnetorheological damper has a higher output damping force and a wider controllable damping range. A rotary magnetorheological damper was developed and its performance was tested. The experimental results indicate that the damper has a higher torque to volume ratio, which verifies the effectiveness of the rotary magnetorheological damper and mechanical model proposed in this paper. The work of this article provides a theoretical basis for designing a rotary magnetorheological damper with higher torque to volume ratio. © The Author(s), under exclusive license to Springer Nature Singapore Pte Ltd. 2024.

关键词： Magnetic circuits

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DarkSAM: Fooling Segment Anything Model to Segment Nothing 38

DarkSAM: Fooling Segment Anything Model to Segment Nothing

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38th Conference on Neural Information Processing systems, NeurIPS 2024

作者： Zhou, Ziqi Song, Yufei Li, Minghui Hu, Shengshan Wang, Xianlong Zhang, Leo Yu Yao, Dezhong Jin, Hai National Engineering Research Center for Big Data Technology and System China Services Computing Technology and System Lab China Cluster and Grid Computing Lab China Hubei Engineering Research Center on Big Data Security China Hubei Key Laboratory of Distributed System Security China School of Computer Science and Technology Huazhong University of Science and Technology China School of Cyber Science and Engineering Huazhong University of Science and Technology China School of Software Engineering Huazhong University of Science and Technology China School of Information and Communication Technology Griffith University Australia

Segment Anything Model (SAM) has recently gained much attention for its outstanding generalization to unseen data and tasks. Despite its promising prospect, the vulnerabilities of SAM, especially to universal adversarial perturbation (UAP) have not been thoroughly investigated yet. In this paper, we propose DarkSAM, the first prompt-free universal attack framework against SAM, including a semantic decoupling-based spatial attack and a texture distortion-based frequency attack. We first divide the output of SAM into foreground and background. Then, we design a shadow target strategy to obtain the semantic blueprint of the image as the attack target. DarkSAM is dedicated to fooling SAM by extracting and destroying crucial object features from images in both spatial and frequency domains. In the spatial domain, we disrupt the semantics of both the foreground and background in the image to confuse SAM. In the frequency domain, we further enhance the attack effectiveness by distorting the high-frequency components (i.e., texture information) of the image. Consequently, with a single UAP, DarkSAM renders SAM incapable of segmenting objects across diverse images with varying prompts. Experimental results on four datasets for SAM and its two variant models demonstrate the powerful attack capability and transferability of DarkSAM. Our codes are available at: https://***/CGCL-codes/DarkSAM. © 2024 Neural information processing systems foundation. All rights reserved.

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