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Contact optimisation strategy for wafer-scale field-effect transistors based on two-dimensional semiconductors

Journal of Materials Science & technology 2023年第2期133卷 230-237页

作者： Ling Tong Xiaojiao Guo Zhangfeng Shen Lihui Zhou Jingyi Ma Xinyu Chen Honglei Chen Yin Xia Chuming Sheng Saifei Gou Die Wang Xinyu Wang Xiangqi Dong Yuxuan Zhu Xinzhi Zhang David Wei Zhang Sheng Dai Xi Li Peng Zhou Yangang Wang Wenzhong Bao State Key Laboratory of ASIC and System School of MicroelectronicsFudan UniversityShanghai 200433China College of Biological Chemical Science and EngineeringJiaxing UniversityJiaxing 314001China Key Laboratory for Advanced Materials and Feringa Nobel Prize Scientist Joint Research Center Institute of Fine ChemicalsSchool of Chemistry&Molecular EngineeringEast China University of Science and TechnologyShanghai 200237China State Key Laboratory of Surface Physics and Department of Physics Fudan UniversityShanghai 200433China

Two-dimensional(2D)semiconductors can be utilized to continually miniaturize nanoscale electronic ***,achieving a practical solution for satisfying electrical contact with 2D semiconductors remains *** this study,we developed a novel contact structure with transferred multilayer(t-ML)MoS 2 by integrating both edge and top *** in-situ plasma treatment for the edge of the MoS 2 channel and successive metal deposition,we achieved 16 times lower contact resistivity(22.8 kΩμm)than that of the top contacted *** thickness-dependent electrical measurement indicates that edge contact is highly effective with thick MoS 2 due to the alleviated current-crowding effect re-sulting from the small contact *** temperature-dependent transport measurement further confirms the effective minimization of the influence from the Schottky barrier and tunnelling ***,the simplified resistor network model and energy-band diagram were proposed to understand the carrier transport *** work provides a practical strategy for achieving excellent electrical contact between bulk metals and 2D semiconductors,paving the way for future large-scale 2D electronic devices.

关键词： Edge contact 2D materials Field-effect transistors Schottky barrier Contact resistance

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Research on active equalization technology and simulation of battery modules 4

Research on active equalization technology and simulation of...

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4th International Conference on Electrical Engineering and Control Science, IC2ECS 2024

作者： Zhang, Qingjie Li, Xin Shao, Xuming Nari Technology Co. Ltd Nanjing China Nari Technology Co. Ltd State Key Laboratory of Technology and Equipment for Defense Against Power System Operational Risks Nanjing China

ISBN: (纸本)9798331510107

The principles and current situation of the active balancing technology between modules in the Battery Management system (BMS) of the energy storage power station is researched in this article. A typical solution for Matlab/Simulink simulation is used to verify and evaluate advantages and disadvantages of inter-module active balancing strategy. Through the simulation, the best inter-module balancing solution is determined, and the size of the balancing current is established. © 2024 IEEE.

关键词： MATLAB

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Beyond the Field-of-View: Enhancing Scene Visibility and Perception with Clip-Recurrent Transformer

IEEE Transactions on Intelligent Vehicles

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IEEE Transactions on Intelligent Vehicles 2024年 1-16页

作者： Shi, Hao Jiang, Qi Yang, Kailun Yin, Xiaoting Ni, Huajian Wang, Kaiwei State Key Laboratory of Extreme Photonics and Instrumentation and the National Engineering Research Center of Optical Instrumentation Zhejiang University Hangzhou China School of Robotics and the National Engineering Research Center of Robot Visual Perception and Control Technology Hunan University Changsha China Shanghai SUPREMIND Technology Company Ltd Shanghai China

Vision sensors are widely applied in vehicles, robots, and roadside infrastructure. However, due to limitations in hardware cost and system size, camera Field-of-View (FoV) is often restricted and may not provide sufficient coverage. Nevertheless, from a spatiotemporal perspective, it is possible to obtain information beyond the camera's physical FoV from past video streams. In this paper, we propose the concept of online video inpainting for autonomous vehicles to expand the field of view, thereby enhancing scene visibility, perception, and system safety. To achieve this, we introduce the FlowLens architecture, which explicitly employs optical flow and implicitly incorporates a novel clip-recurrent transformer for feature propagation. FlowLens offers two key features: 1) FlowLens includes a newly designed Clip-Recurrent Hub with 3D-Decoupled Cross Attention (DDCA) to progressively process global information accumulated over time. 2) It integrates a multi-branch Mix Fusion Feed Forward Network (MixF3N) to enhance the precise spatial flow of local features. To facilitate training and evaluation, we derive the KITTI360 dataset with various FoV mask, which covers both outer- and inner FoV expansion scenarios. We also conduct quantitative assessments of beyond-FoV semantics across different models and perform qualitative comparisons of beyond-FoV object detection. We illustrate that employing FlowLens to reconstruct unseen scenes even enhances perception within the field of view by providing reliable semantic context. Extensive experiments and user studies involving offline and online video inpainting, as well as beyond-FoV perception tasks, demonstrate that FlowLens achieves state-of-the-art performance. The source code and dataset are made publicly available at https://***/MasterHow/FlowLens. IEEE

关键词： Cameras

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Force Distribution-Based Control Strategy of Landing Gear for the Unmanned Helicopter Landing on the Inclined Surface

Force Distribution-Based Control Strategy of Landing Gear fo...

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2022 IEEE International Conference on robotics and Biomimetics, ROBIO 2022

作者： Tian, Baolin Yu, Haitao Mao, Shihao Cui, Yuxin Yan, Zhen Gao, Haibo Harbin Institute of Technology State Key Laboratory of Robotics and System Harbin China College of Electronic Information Engineering Beihang University and the Shanghai Academy of Spaceflight Technology Shanghai China

ISBN: (纸本)9781665481090

The unmanned helicopter plays an important role in the fields of cargo transportation and rescue missions. Due to the limitation of the traditional landing gear structure, the unmanned helicopter has more stringent requirements on the landing terrain. In order to improve the ability to land on the inclined surface for the unmanned helicopter, a novel control strategy of the landing gear based on contact force distribution algorithm is proposed. The overall of landing process includes the desired position tracking stage, the following stage and the attitude adjusting stage. By obtaining the desired acceleration according to the landing and attitude correcting curve of the fuselage, and calculating the desired force based on contact force distribution algorithm, the adaptive motion and trajectory tracking of the landing gear during the landing process has been realized. The simulation results have demonstrated the effectiveness of the strategy when the unmanned helicopter with the initial roll angle of -3 degrees and pitch angle of 3 degrees lands on the inclined surface of 7.07 degrees. In the future, the control strategy can provide a reference for the dynamic landing of the unmanned helicopter while at sea. © 2022 IEEE.

关键词： Acceleration

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An integrated micromachined flexible ultrasonicinductive sensor for pipe contaminant multiparameter detection

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Microsystems & Nanoengineering 2024年第4期10卷 271-283页

作者： Zheng Yuan Xiaoyu Wu Zhikang Li Jiawei Yuan Yihe Zhao Zixuan Li Shaohui Qin Qi Ma Xuan Shi Zilong Zhao Jiazhu Li Shiwang Zhang Weixuan Jing Xiaozhang Wang Libo Zhao State Key Laboratory for Manufacturing Systems Engineering International Joint Laboratory for Micro/Nano Manufacturing and Measurement TechnologiesXi’an Jiaotong University(Yantai)Research Institute for Intelligent Sensing Technology and SystemXi’an Jiaotong UniversityXi’an 710049China School of Mechanical Engineering Xi’an Jiaotong UniversityXi’an 710049China School of Instrument Science and Technology Xi’an Jiaotong UniversityXi’an 710049China Shandong Laboratory of Yantai Advanced Materials and Green Manufacturing Yantai 265503China

Pipe contaminant detection holds considerable importance within various industries,such as the aviation,maritime,medicine,and other pertinent *** capability is beneficial for forecasting equipment potential failures,ascertaining operational situations,timely maintenance,and lifespan ***,the majority of existing methods operate offline,and the detectable parameters online are relatively *** constraint hampers real-time on-site detection and comprehensive assessments of equipment *** address these challenges,this paper proposes a sensing method that integrates an ultrasonic unit and an electromagnetic inductive unit for the real-time detection of diverse contaminants and flow rates within a *** ultrasonic unit comprises a flexible transducer patch fabricated through micromachining technology,which can not only make installation easier but also focus the sound ***,the sensing unit incorporates three symmetrical solenoid *** a comprehensive analysis of ultrasonic and induction signals,the proposed method can be used to effectively discriminate magnetic metal particles(e.g.,iron),nonmagnetic metal particles(e.g.,copper),nonmetallic particles(e.g.,ceramics),and *** inclusive categorization encompasses nearly all types of contaminants that may be present in a ***,the fluid velocity can be determined through the ultrasonic Doppler frequency *** efficacy of the proposed detection principle has been validated by mathematical models and finite element *** contaminants with diverse velocities were systematically tested within a 14mm diameter *** experimental results demonstrate that the proposed sensor can effectively detect contaminants within the 0.5−3mm range,accurately distinguish contaminant types,and measure flow velocity.

关键词： inductive holds ultrasonic

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A Multi-Source Domain Generalization Method for Bearing RUL Prediction Based on Time-Variant and Time-Invariant Feature Extraction 5

A Multi-Source Domain Generalization Method for Bearing RUL ...

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5th International Conference on Sensing, Measurement and Data Analytics in the Era of Artificial Intelligence, ICSMD 2024

作者： Deng, Zhengyu Xu, Zhen Xu, Juan Chen, Xing Ren, Qile School of Computer and Information Hefei University of Technology Hefei China State Key Laboratory of High-end Compressor and System Technology Hefei China Co. Ltd Shanghai China

ISBN: (纸本)9798331529192

Deep learning-based remaining useful life (RUL) prediction methods have demonstrated significant advantages due to their powerful feature representation capabilities. Although existing learning models have made progress in distinguishing between the time-varying and time-invariant characteristics of vibration signals, challenges remain in fully capturing these aspects, which can hinder their generalization performance. To address this issue, we propose a domain generalization method based on the extraction of time-varying and time-invariant features, tailored to the characteristics of bearing vibration time series signals. Firstly, Fourier transform and inverse Fourier transform are employed to isolate high-frequency features, obtaining both time-varying and time-invariant signals. The time-varying signals are then processed using an attention mechanism to extract time-varying features and learn the bearing degradation trend. Concurrently, the time-invariant signals are fed into an encoder-decoder structure to extract their invariant features. Finally, both sets of features are input into a Gate Recurrent Unit (GRU) module for RUL prediction. Experimental results across three tasks demonstrate that our model achieves excellent generalization capabilities. © 2024 IEEE.

关键词： Inverse transforms

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A Light Space Manipulator with High Load-to-Weight Ratio: system Development and Compliance Control

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Space(Science & technology) 2021年第1期2021卷 107-118页

作者： Zhiwei Wu Yongting Chen Wenfu Xu The School of Mechanical Engineering and Automation Harbin Institute of TechnologyShenzhen 518055China The State Key Laboratory of Robotics and System Harbin Institute of TechnologyHarbin 150001China

In order to meet the requirements of the space environment for the lightweight and load capacity of the manipulator,this paper designs a lightweight space manipulator with a weight of 9.23 kg and a load of 2 *** adopts the EtherCAT communication protocol and has the characteristics of high load-to-weight *** order to achieve constant force tracking under the condition of unknown environmental parameters,an integral adaptive admittance control method is *** control law is expressed as a third-order linear system equation,the operating environment is equivalent to a spring model,and the control error transfer function is *** control performance under the step response is further *** simulation results show that the proposed integral adaptive admittance control method has better performance than the traditional *** has no steady-state error,overcomes the problems caused by nonlinear discrete compensation,and can facilitate analysis in the frequency domain,realize parameter optimization,and improve calculation accuracy.

关键词： overcome load EtherCAT

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Multi-physical Finite Element Modeling and Influencing Factor Analysis for Solder Layer Failure of SiC MOSFET Device 17th

Multi-physical Finite Element Modeling and Influencing Facto...

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17th Annual Conference of China Electrotechnical Society, CES 2022

作者： Yao, Ran Li, Hui Lai, Wei Li, Hanrui Duan, Zeyu Chen, Siyu Chen, ZhongYuan Li, Yaosheng State Key Laboratory of Advanced Power Transmission Technology Beijing Institute of Smart Energy Beijing102209 China State Key Laboratory of Power Transmission Equipment and System Security and New Technology Shapingba District Chongqing400044 China

ISBN: (纸本)9789819904075

Solder layer failure is one of the main failure modes of SiC MOSFET devices within To packaging. In this paper, the solder layer failure simulation and influencing factor analysis of SiC MOSFET devices are carried out based on the multi-physical field finite element modeling method. Firstly, the SiC MOSFET device multi-physical field simulation model is established based on the packaging structure of To-247–3, and the Computed Tomography test obtains the hole distribution of the SiC MOSFET device solder layer. Secondly, The stress distribution of the solder layer during the aging process of SiC MOSFET devices is analyzed, and the failure mechanism of the solder layer of the SiC MOSFET device is studied. Finally, the effect of different solder layer hole sizes on device performance is simulated, and the impact of different ambient temperatures and current levels on the failure performance of the solder layer failure of the SiC MOSFET device is analyzed. © 2023, Beijing Paike Culture Commu. Co., Ltd.

关键词： Failure (mechanical)

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Preliminary Development of a Simulation Capability for Zircaloy Clad Ballooning in LOCA

Preliminary Development of a Simulation Capability for Zirca...

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International Conference on Water Reactor Fuel Performance Meeting, WRFPM 2023

作者： Li, A. Wei Wu, B. Xiaoli State Key Laboratory for Strength and Vibration of Mechanical Structures Xi’an Jiaotong University Xi’an710049 China Science and Technology on Reactor System Design Technology Laboratory Nuclear Power Institute of China Chengdu610213 China

ISBN: (纸本)9789819971565

Zircaloy clad is widely known to be vulnerable to ballooning and burst in a loss-of-coolant accident (LOCA) typical of high-temperature steam environment, due to internal and external pressure difference and degraded strength. Ballooning can be detrimental in light of nuclear reactor safety. Due to the large deformation and complex constitute models in the ballooning process, detailed numerical simulation of Zircaloy clad ballooning has long been a challenge. This paper presented a preliminary Finite-Element-Method (FEM) implementation for analyzing Zircaloy clad ballooning. The developed capability can be used to predict progressive clad ballooning up to failure determined by empirical burst limit. Included physic models are currently phase transformation and high-temperature creep. Especially, anisotropic creep was considered for the α phase Zircaloy. The stress update algorithm is implicit in time integration, which ensures relatively large time increment during the simulation. The PUZRY separate effect tests were used to validate the FEM capability. The predicted time to failure (burst) is acceptable when compared with the experimental data. Besides, it was found that the effect of anisotropic coefficients is significant on the prediction of ballooning. © The Author(s), under exclusive license to Springer Nature Singapore Pte Ltd 2024.

关键词： Loss of coolant accidents

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Bi-objective Layout Optimization for Multiple Wind Farms Considering Sequential Fluctuation of Wind Power Using Uniform Design

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CSEE Journal of Power and Energy systems 2022年第6期8卷 1623-1635页

作者： Yinghao Ma Kaigui Xie Yanan Zhao Hejun Yang Dabo Zhang Anhui Province Key Laboratory of Renewable Energy Utilization and Energy Saving Hefei University of TechnologyHefei 230009China State Key Laboratory of Power Transmission Equipment&System Security and New Technology Chongqing UniversityChongqing 400044China School of Computer Science and Technology at University of Science and Technology of China Hefei 230027China

The fluctuation of wind power brings great challenges to the secure,stable,and cost-efficient operation of the power *** of the time-correlation of wind speed and the wake effect of wind turbines,the layout of wind farm has a significant impact on the wind power sequential *** order to reduce the fluctuation of wind power and improve the operation security with lower operating cost,a bi-objective layout optimization model for multiple wind farms considering the sequential fluctuation of wind power is proposed in this *** goal is to determine the optimal installed capacity of wind farms and the location of wind *** proposed model maximizes the energy production and minimizes the fluctuation of wind power *** improve the accuracy of wind speed estimation and hence the power calculation,the timeshifting of wind speed between the wind tower and turbines’locations is also considered.A uniform design based two-stage genetic algorithm is developed for the solution of the proposed *** studies demonstrate the effectiveness of this proposed model.

关键词： Wind farm layout optimization(WFLO) wind power fluctuation bi-objective optimization uniform design

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