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IEEE International Symposium on Circuits and systems (ISCAS)

作者： Ziyang Shen Fengshi Tian Jingwen Jiang Chaoming Fang Xiaoyong Xue Jie Yang Mohamad Sawan CenBRAIN Neurotech Center of Excellence School of Engineering Westlake University Hangzhou Zhejiang China Department of ECE Hong Kong University of Science and Technology Hong Kong SAR China State Key Laboratory of ASIC and System School of Microelectronics Fudan University Shanghai China

Neuromorphic computing approaches such as Spiking Neural Networks (SNN) have been increasingly adopted in bio-signal processing and interpretation due to its intrinsic neurodynamic attribute. Nevertheless, reconciling performance and power efficiency in SNN implementation is still a bottleneck. Single-spike neural coding scheme, which is an extremely sparse coding scheme, provides a solution to bridge the gap. In this work, a neuromorphic architecture, using binary single spike neural signals, is proposed with both algorithm and hardware implementation. A sparsity-aware spatial-temporal back-propagation training method is proposed together with a single-spike coding scheme. Also, a novel neuromorphic accelerator is co-designed with algorithmic optimization and implemented in 40nm CMOS process. Experimental results show that the proposed processor reaches an accuracy of 94.61% on the MNIST dataset, 93.59% on the N-MNIST dataset, and 93.27% on the ECG dataset, respectively, while consumes $0.173\mu\mathrm{J}$ per ECG classification task and 0.16mm 2 on-chip area. The overall power consumption is reduced by 91.68% compared to the state-of-the-art systems.

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Mechanics of Regulatable Hydrogel Adhesion with Elastic Heterogeneity

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SSRN 2023年

作者： Zhu, Heng Yin, Tenghao Hu, Xiaocheng Liu, Binhong Yu, Honghui Chen, Zhe Qu, Shaoxing Yang, Wei State Key Laboratory of Fluid Power & Mechatronic System Key Laboratory of Soft Machines and Smart Devices of Zhejiang Province Center for X-Mechanics Department of Engineering Mechanics Zhejiang University Hangzhou310027 China Department of Mechanical Engineering The City College of New York New YorkNY10031 United States Institute of Flexible Electronics Technology of Tsinghua Jiaxing314006 China

Hydrogel adhesion regulation remains a key challenge in applications of stretchable electronics, tissue engineering, and soft robotics. Whereas existing strategies are focused on adhesion enhancement, the underlying mechanics of on-demand mechanical regulation from adhesion promotion to adhesion reduction receives insufficient attention. We propose an effective method to manipulate the energy process zone near the crack front by invoking periodically elastic heterogeneity, whose adhesion toughness exhibits high dependence on the periodic structures and peeling direction. Without modifying surface chemistry, the adhesion of heterogeneous interfaces implemented by 3D printing can enhance 6-folds in peak force or weaken to 1/30 in interfacial toughness, as compared to the case of a homogeneous interface. Based on a variational principle, analytical formulation and finite element simulation are performed to quantify the heterogeneous behaviors. The analysis captures the instability phenomenon and predicts the maximum peel force. Combined experimental, theoretical, and finite element results demonstrate the effects of geometric parameters and peeling directions on the overall adhesion toughness. Those data elucidate an energy storage mechanism, namely the discrete elastic ligaments free of lateral constraints could enable the interface to accommodate large stretching and to store intensified strain energy. The results also indicate the necessity and significance of peeling directions. The work provides a design guideline for on-demand enhancement and detachment in hydrogel interface applications. © 2023, The Authors. All rights reserved.

关键词： Adhesion

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Non-destructive evaluation of nanoparticles dispersion in nanocomposite dielectrics based on nonlinear ultrasonic method 16

Non-destructive evaluation of nanoparticles dispersion in na...

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16th IET International Conference on AC and DC Power Transmission, ACDC 2020

作者： Fang, Wei Wang, Hanqing Cheng, Li Yang, Lijun Liao, Ruijin State Key Laboratory of Power Transmission Equipment and System Security and New Technology Chongqing University 174 Shazheng Street Chongqing China

ISBN: (纸本)9781839533914

In order to improve the safety and stability of transmission systems, nanocomposite dielectrics have been widely concerned by researchers. The dispersion of nano-fillers in dielectrics is critical to material properties. But a comprehensive and non-destructive method of microscopic characterization for the dispersion of nano-fillers is still waiting to be discovered. In this paper, nano-magnesium oxide (MgO) modified epoxy resin sheets with different dispersion degrees were prepared by physical and chemical methods. Nonlinear ultrasonic method and scanning electron microscope (SEM) imaging were conducted. The results show that the second-order ultrasonic nonlinear parameter of the sample is positively correlated with the agglomeration degree of nanoparticles. The average diameter of nanoparticles increases with the agglomeration degree of the nanoparticles. These findings reveal an important new strategy for evaluating the reliability of nano modification for nanodielectrics. © 2020 Institution of Engineering and technology. All rights reserved.

关键词： Nanocomposites

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Target detection in anechoic chamber based on the interrupted transmitting and receiving of PCM signal 5

Target detection in anechoic chamber based on the interrupte...

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IET International Radar Conference 2020, IET IRC 2020

作者： Zhao, Feng Liu, Xiaobin Xie, Ailun Wu, Qihua State Key Laboratory of Complex Electromagnetic Environmental Effects on Electronics and Information System National University of Defense Technology Changsha410073 China

ISBN: (纸本)9781839535635

Phase coded modulation (PCM) signal has been widely used in target detection at the out-field. However, when the PCM signal is utilized in the anechoic chamber for target detection, the target echo returns before the signal is fully transmitted, which results in the signal coupling at the receiver. In this paper, the interrupted transmitting and receiving (ITR) is adopted to solve the problem. Then, the procedure of target detection with PCM signal in anechoic chamber is proposed. The constraints of the ITR parameters are discussed according to the anechoic chamber size and the PCM signal parameters. By conducting the numerical simulations, the effectiveness of the proposed target detection method is verified. © 2020 Institution of Engineering and technology. All rights reserved.

关键词： Numerical methods

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Improved Temperature Estimation Model of 4H-SiC MOSFET under Avalanche Condition 4

Improved Temperature Estimation Model of 4H-SiC MOSFET under...

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4th International Conference on HVDC, HVDC 2020

作者： Yu, Renze Li, Hui Zhong, Yi Lai, Wei Wang, Xiao Yao, Ran Liu, Renkuan Yu, Yue State Key Laboratory of Power Transmission Equipment System Security and New Technology School of Electrical Engineering Chongqing University Chongqing China

ISBN: (纸本)9781728175935

Silicon Carbide (SiC) Metallic Oxide Semiconductor Field Effect Transistor (MOSFET) has fast switching speed and under unclamped inductive switching (UIS) environment, the device may suffer from avalanche breakdown. In this occasion, it is necessary to estimate the temperature inside SiC MOSFET accurately. However, current models rarely consider the effect of temperature-dependent parameters, leading to inaccuracy estimation. In this paper, a Cauer thermal network considering the temperature-dependent property of material thermal characteristics under avalanche state is proposed. First, the relationship between temperature and material parameters is illustrated. Then, according to the scanning electron microscope (SEM) analysis, the geometric parameters of the chip are obtained, and the cell model of SiC MOSFET is built using technology Computer Aided Design (TCAD). Next, a transient Cauer thermal network is proposed with temperature-dependent parameters considered. Finally, the junction temperature of the proposed model is extracted and verified. Compared with the thermal network using constant parameters, the accuracy is significantly improved. Also, the model saves computation time and resource in contrast with the TCAD model. © 2020 IEEE.

关键词： Silicon carbide

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Analysis on the magnetic flux leakage distribution in the transformer under different winding deformation and typical working condition 7

Analysis on the magnetic flux leakage distribution in the tr...

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7th IEEE International Conference on High Voltage Engineering and Application, ICHVE 2020

作者： Ouyang, Xi Zhou, Quan Luo, Zhenhui Jiang, Qian Chen, Minghao Li, Yong State Key Laboratory of Power Transmission Equipment System Security and New Technology School of Electrical Engineering Chongqing University Chongqing China

ISBN: (纸本)9781728155111

The transformer partial winding deformation, as the precursor of the inter-turn insulation breakdown and total winding mechanic instability, often induces the change of magnetic flux leakage distribution. And monitoring online the magnetic flux leakage characters and diagnosing the transformer partial winding deformation is the novel and good method to prevent the transformer faults in advance, which can make up for the shortcomings of the existing methods. Thus, it is key to explore the magnetic flux leakage distribution law under different winding deformation and working conditions. In the paper, the 35kV power transformer was selected as the research object and its simulation model with different partial radial and axial winding deformation was built. The equivalent method of abnormal operating conditions including DC (Direct current) bias and external short-circuit was determined. Consequently, the change law of magnetic flux leakage characteristics in the transformer was analyzed under the different conditions. The results show the magnetic flux leakage under different winding deformation has a different distribution characteristic, and the information can be used to identify the severity degree and location of the defects. And the character of winding deformation can be distinguished from the disturbances by the feature identification. © 2020 IEEE.

关键词： Power transformers

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A Novel Ex-Situ Accelerated Evaluation Method for Metallic Bipolar Plates in Proton Exchange Membrane Fuel Cells

SSRN

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SSRN 2023年

作者： Li, Huanming Li, Xiaobo Bi, Feifei Xu, Zhutian Zhou, Fei Fan, Chenyao Dong, Liang Shi, Weiyu Peng, Linfa Lai, Xinmin Shanghai Zhizhen New Energy Company Limited Shanghai201306 China State Key Laboratory of Mechanical System and Vibration Shanghai Jiao Tong University Shanghai200240 China Shanghai Key Laboratory of Digital Manufacture for Thin-walled Structures Shanghai Jiao Tong University Shanghai200240 China Shanghai Hydrogen Propulsion Technology Company Limited Shanghai201804 China

Proton exchange membrane fuel cells (PEMFCs) are considered as one of the most promising energy devices for transportations due to their high efficiency and cleanliness. However, metallic BPPs, one of key components of PEMFCs, encounter an essential problem of insufficient durability. At present, the development of metallic BPPs is limited by the lack of scientific, efficient, and low-cost durability evaluation methods. We report a novel ex-situ accelerated durability evaluation method based on the quantitative analysis of PEMFC voltage loss caused by the ICR of metallic BPPs and the metal ions released from metallic BPPs. According to the in-situ evaluation (12000 h) results, the acceleration factor of proposed method is about 100. The availability and the accuracy of proposed method were verified by comparing the microstructure of metallic BPPs after in-situ and ex-situ test. The establishment of ex-situ accelerated evaluation method hold great promise for developing metallic BPPs with higher durability. © 2023, The Authors. All rights reserved.

关键词： Durability

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Design of an Ultra-Low Modulus 3D Printed Titanium Bio-Metamaterials for Bone Replacement

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Additive Manufacturing Frontiers 2025年第1期4卷

作者： Song, Facheng Wang, Leilei Zhang, Yihan Qiu, Jian Luo, Jing Wang, Ling Li, Dichen State Key Laboratory for Manufacturing System Engineering School of Mechanical Engineering Xi'an Jiaotong University Xi'an 710054 China Shaanxi Ruiyi Medical Technology Co.Ltd. Xi'an 710300 China National Medical Products Administration (NMPA) Key Laboratory for Research and Evaluation of Additive Manufacturing Medical Devices Xi'an Jiaotong University Xi'an 710054 China National Innovation Platform (Center) for Industry-Education Integration of Medical Technology Xi'an Jiaotong University Xi'an 710054 China

Porous designs effectively reduce stress shielding in metallic orthopedic implants. However, current porous structures often fail to adequately meet the needs of patients with osteoporosis and low-modulus body regions. This study proposes a sinusoidal-based lattice structure for an ultralow and widely tunable modulus design, aiming to match diverse bone tissue requirements and enhance biomechanical compatibility. Parametric modeling and finite element analysis were used to evaluate the performance of this structure. Results show that, within the design range suitable for bone growth, the elastic modulus of this lattice structure is tunable over a wide range, from 0.09 to 32.67 GPa, outperforming existing porous structures. The lowest value closely matched the minimum mechanical properties of human cancellous bone among porous structures. Moreover, the structure exhibited distinct anisotropic characteristics, allowing for directional design based on mechanical requirements. The structure's permeability ranged from 1.19 × 10^–8 m² to 2.3 × 10^–7 m², making it highly compatible with human cancellous bone and meeting the requirements of orthopedic implants. Samples with porosities ranging from 46 % to 87 % were successfully fabricated using powder bed fusion additive manufacturing, validating the simulation predictions. This tunable low-modulus lattice structure provides a novel approach for developing personalized orthopedic implants, particularly for patients with specialized needs such as osteoporosis, and can potentially enhance biomechanical compatibility and long-term stability. © 2025

关键词： Additive manufacturing Bio-metamaterial Bone scaffold Lattice structure Low modulus

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Is There Existing A Gaseous Process during the Propagation of Streamer in the Natural Ester 7

Is There Existing A Gaseous Process during the Propagation o...

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7th IEEE International Conference on High Voltage Engineering and Application, ICHVE 2020

作者： Chen, Gang Huang, Zhengyong Li, Jian Duan, Yu Dan, Linyang He, Jianfeng State Key Laboratory of Power Transmission Equipment System Security and New Technology School of Electrical Engineering Chongqing University Chongqing China

ISBN: (纸本)9781728155111

The ingredient existed in the streamer channel is the critical factor for studying discharge in the dielectric liquid. In this paper, the dual-needle/plate electrode and shadowgraph technique are used in the experiment. The propagation and gaseous characteristics of the streamer in natural ester are discussed during the lightning impulse voltage. Results show that the polarity of the voltage significantly affects the streamer patterns and the initial field strength of adjacent needle electrodes. Besides, there is only a single breakdown channel for both positive and negative streamers, and the position and pattern of the negative streamer can be changed under the influence of the breakdown channel. An expansion phenomenon of the non-breakdown negative streamer channels is recorded under the heat and light generated by the breakdown channel. The expansion phenomenon of the streamer is the growth process of microbubbles in the streamer channel. Results provide a new way to discuss the existence of microbubbles in the streamer channel and believe microbubbles play a vital role in the formation and propagation of the streamer. © 2020 IEEE.

关键词： Dielectric liquids

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A non-unit adaptive traveling wave protection method for flexible DC transmission lines based on supplement of voltage data

A non-unit adaptive traveling wave protection method for fle...

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12th International Conference on Renewable Power Generation (RPG 2023)

作者： L. Zhang S. Li S. Xu Y. Li Q. Chen K. Yao Institute of System Analysis and DC Transmission Technology Electric Power Research Institute of Yunnan Power Grid Co. Ltd Kunming People's Republic of China Kunming Power Supply Bureau Kunming People's Republic of China State Key Laboratory of HVDC Electric Power Research Institute China Southern Power Grid Guangzhou People's Republic of China State Key Laboratory of Alternative Electrical Power System with Renewable Energy Sources North China Electric Power University Beijing People's Republic of China

ISBN: (数字)9781839539497

Traveling wave (TW) protection is crucial for ensuring the safety and stability of flexible DC transmission lines. Thereinto, shortening the sampling step is the key to improve the sensitivity of the derivative-based TW protection. However, higher sampling frequency is difficult to engineer and the protection performance will be constrained in case of the high resistance faults. To address this issue, a non-unit adaptive TW protection based on the supplement of voltage data has been proposed. Firstly, the voltage data is realized to complement utilizing the Lagrange's median theorem at the line boundary, which improves the sampling frequency. Then, it has been observed that the fault current variation is negatively correlated with transition resistance. Specially, the proposed protection takes this fully into account by incorporating the adaptive threshold that covers differences among various fault locations. Therefore, the proposed protection can effectively distinguish internal faults with high sensitivity. Finally, a two-terminal ±500kV MMC-HVDC (modular multilevel converter-high voltage direct current) system is built using PSCAD/EMTDC. The simulation results demonstrate that the line faults can be fast and correctly identified, even with 300 Ω fault impedance, in various fault scenarios.

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