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An artificial neural network chip based on two-dimensional semiconductor

Science Bulletin 2022年第3期67卷 270-277页

作者： Shunli Ma Tianxiang Wu Xinyu Chen Yin Wang Hongwei Tang Yuting Yao Yan Wang Ziyang Zhu Jianan Deng Jing Wan Ye Lu Zhengzong Sun Zihan Xu Antoine Riaud Chenjian Wu David Wei Zhang Yang Chai Peng Zhou Junyan Ren Wenzhong Bao State Key Laboratory of ASIC and System School of MicroelectronicsFudan UniversityShanghai 200433China State Key Laboratory of ASIC and System School of Information Science and TechnologyFudan UniversityShanghai 200433China Shenzhen Sixcarbon Technology Shenzhen 518106China School of Electronic and Information Engineering Soochow UniversitySuzhou 215006China Department of Applied Physics The Hong Kong Polytechnic UniversityHung HomKowloonHong KongChina

Recently,research on two-dimensional(2D)semiconductors has begun to translate from the fundamen-tal investigation into rudimentary functional *** this work,we unveil the first functional MoS2 artificial neural network(ANN)chip,including multiply-and-accumulate(MAC),memory and activation function *** MoS2 ANN chip is realized through fabricating 818 field-effect transistors(FETs)on a wafer-scale and high-homogeneity MoS2 film,with a gate-last process to realize top gate structured FETs.A 62-level simulation program with integrated circuit emphasis(SPICE)model is utilized to design and optimize our analog ANN *** demonstrate a practical application,a tactile digit sensing recognition was demonstrated based on our ANN *** training,the digit recognition rate exceeds 97%.Our work not only demonstrates the protentional of 2D semiconductors in wafer-scale inte-grated circuits,but also paves the way for its future application in AI computation.

关键词： MoS_(2) Two-dimensional(2D)FETs Artificial neural network(ANN) Multiply-and-accumulate(MAC) Circuits

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Acoustic soft metacollimator by broadband digital phase encoding

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Physical Review Applied 2024年第1期22卷 014065-014065页

作者： Erqian Dong Jinhu Zhang Xiaochun Su Zhanyuan Gao Chen Yang Zhenyu Wang Nicholas X. Fang Yu Zhang State Key Laboratory of Marine Environmental Science Key Laboratory of Underwater Acoustic Communication and Marine Information Technology of the Ministry of Education College of Ocean and Earth Sciences Department of Mechanical Engineering State Key Laboratory of Robotics Shenyang Institute of Automation

Phase engineering plays a pivotal role in various scientific research and industrial applications including microwaves, optics, and acoustics. However, traditional phase engineering methods lack the flexibility for arbitrary programming due to the absence of digitization. Conversely, while broadband digitization technology holds promise, its utilization in wave engineering has been constrained by narrowband transmission capabilities. In this study, we introduce a novel approach to broadband digital phase encoding spanning frequencies from 50 to 500 kHz. Our methodology is exemplified through the development of an acoustic soft metacollimator with simulations and experiments conducted underwater across different frequency ranges. Our findings demonstrate that the soft metacollimator significantly enhances transmission intensity by 7.7 dB and improves spatial resolution by a factor of 10. Moreover, the soft metacollimator enables novel functionalities such as long-distance energy enhancement and broadband coding properties in underwater acoustics. This pioneering broadband digital phase encoding technique holds promise for advancing next-generation phase engineering and offers versatile applications in biomedical ultrasonics, acoustic communications, and the development of underwater broadband acoustic antennas.

关键词： Acoustic metamaterials Applications of soft matter Sound generation Underwater acoustics Devices Smart materials Acoustic techniques Ultrasound techniques

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A bionic approach for the mechanical and electrical decoupling of an MEMS capacitive sensor in ultralow force measurement

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Frontiers of Mechanical Engineering 2023年第2期18卷 297-317页

作者： Wendi GAO Bian TIAN Cunlang LIU Yingbiao MI Chen JIA Libo ZHAO Tao LIU Nan ZHU Ping YANG Qijing LIN Zhuangde JIANG Dong SUN State Key Laboratory for Manufacturing Systems Engineering International Joint Laboratory for Micro/Nano Manufacturing and Measurement TechnologiesOverseas Expertise Introduction Center for Micro/Nano Manufacturing and Nano Measurement Technologies Discipline InnovationXi’an Jiaotong University(Yantai)Research Institute for Intelligent Sensing Technology and SystemSchool of Mechanical EngineeringXi’an Jiaotong UniversityXi’an 710049China Shandong Laboratory of Yantai Advanced Materials and Green Manufacturing Yantai 265599China State Key Laboratory of Robotics and Systems(HIT) Harbin 150006China Beijing Advanced Innovation Center for Intelligent Robots and Systems Beijing Institute of TechnologyBeijing 100081China Department of Biomedical Engineering City University of Hong KongHong KongChina

Capacitive sensors are efficient tools for biophysical force measurement,which is essential for the exploration of cellular ***,attention has been rarely given on the influences of external mechanical and internal electrical interferences on capacitive *** this work,a bionic swallow structure design norm was developed for mechanical decoupling,and the influences of structural parameters on mechanical behavior were fully analyzed and optimized.A bionic feather comb distribution strategy and a portable readout circuit were proposed for eliminating electrostatic *** instability was evaluated,and electrostatic decoupling performance was verified on the basis of a novel measurement method utilizing four complementary comb arrays and applicationspecific integrated circuit *** electrostatic pulling experiment showed that the bionic swallow structure hardly moved by 0.770 nm,and the measurement error was less than 0.009% for the area-variant sensor and 1.118% for the gap-variant sensor,which can be easily compensated in *** proposed sensor also exhibited high resistance against electrostatic rotation,and the resulting measurement error dropped below 0.751%.The rotation interferences were less than 0.330 nm and(1.829×10^(-7))°,which were 35 times smaller than those of the traditional differential *** on the proposed bionic decoupling method,the fabricated sensor exhibited overwhelming capacitive sensitivity values of 7.078 and 1.473 pF/μm for gap-variant and area-variant devices,respectively,which were the highest among the current *** immunity to mechanical disturbances was maintained simultaneously,i.e.,less than 0.369% and 0.058% of the sensor outputs for the gap-variant and area-variant devices,respectively,indicating its great performance improvements over existing devices and feasibility in ultralow biomedical force measurement.

关键词： micro-electro-mechanical system capacitive sensor bionics operation instability mechanical and electrical decoupling biomedical force measurement

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Polarization-induced photocurrent switching effect in heterojunction photodiodes

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Nano Research 2023年第4期16卷 5503-5510页

作者： Dingbo Chen Yu-Chang Chen Guang Zeng Yu-Chun Li Xiao-Xi Li Dong Li Chao Shen Nan Chi Boon S.Ooi David Wei Zhang Hong-Liang Lu State Key Laboratory of ASIC and System Shanghai Institute of Intelligent Electronics&SystemsSchool of MicroelectronicsFudan UniversityShanghai 200433China Key Laboratory for Information Science of Electromagnetic Waves Department of Communication Science and EngineeringFudan UniversityShanghai 200433China Photonics Laboratory Division of ComputerElectricaland Mathematical Sciences and EngineeringKing Abdullah University of Science and Technology(KAUST)Thuwal 23955-6900Kingdom of Saudi Arabia

The unipolar photocurrent in conventional photodiodes(PDs)based on photovoltaic effect limits the output modes and potential versatility of these devices in *** photodiodes with photocurrent switching are emerging as a promising solution for obtaining photoelectric devices with unique and attractive functions,such as optical logic ***,we design an all-solid-state chip-scale ultraviolet(UV)PD based on a hybrid GaN heterojunction with engineered bipolar polarized electric *** introducing the polarization-induced photocurrent switching effect,the photocurrent direction can be switched in response to the wavelength of incident light at 0 V *** particular,the photocurrent direction exhibits negative when the irradiation wavelength is less than 315 nm,but positive when the wavelength is longer than 315 *** device shows a responsivity of up to−6.7 mA/W at 300 nm and 5.3 mA/W at 340 nm,*** particular,three special logic gates in response to different dual UV light inputs are demonstrated via a single bipolar PD,which may be beneficial for future multifunctional UV photonic integrated devices and systems.

关键词： GaN heterostructure ultraviolet(UV)photodiodes bipolar photocurrent optical logic device

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Magnetic-Field-Assisted LCD Stereolithography for Centipede-Inspired Magnetic Soft Robot

Magnetic-Field-Assisted LCD Stereolithography for Centipede-...

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IEEE International Conference on robotics and Biomimetics

作者： Jinrong Wang Ruixuan Li Yaoyuan Xu Shishi Li Xianghe Meng Hui Xie State key Laboratory of Robotics and Systems Harbin Institute of Technology Harbin China

ISBN: (数字)9798331509644

ISBN: (纸本)9798331509651

This paper presents a novel magnetic-field-assisted LCD stereolithography technique for fabricating centipede-inspired magnetic soft robots. Unlike previous DLP-based methods, our approach leverages Liquid Crystal Display (LCD) technology, offering a simpler optical path, comparable resolution, and cost-effectiveness. The method integrates LCD photo-polymerization with a permanent magnet orienting system possessing 5-DOF in motion, enabling precise control over the direction of magnetization patterns during manufacturing. We demonstrate the technique by designing and fabricating a biomimetic centipede robot with programmable deformation capabilities. Finite element analysis was used to simulate the robot's deformation behavior, which was subsequently validated through experimental locomotion tests. The fabricated robot exhibited complex deformation and efficient locomotion in response to external magnetic fields. This approach advances the creation of intricate magnetic arrangements for planar soft robots, potentially expanding their application in fields such as biomedicine and microfluidics. The proposed method provides a new pathway for manufacturing biologically inspired magnetic soft robots with complex programmable behaviors.

关键词： Temperature sensors Deformation Magnetization Soft robotics Liquid crystal displays Permanent magnets Stereolithography Finite element analysis Magnetic fields Soft magnetic materials

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Depth Recognition of Hard Inclusions in Tissue Phantoms for Robotic Palpation

Depth Recognition of Hard Inclusions in Tissue Phantoms for ...

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2022 IEEE International Conference on Real-Time Computing and robotics, RCAR 2022

作者： Zhou, Zhenning Fang, Senlin Ye, Chaoxiang Mi, Tingting Huang, Binhua Li, Xiaoyu Yi, Zhengkun Wu, Xinyu Guangdong Provincial Key Laboratory of Robotics and Intelligent System Shenzhen Institute of Advanced Technology Chinese Academy of Sciences Shenzhen518055 China Shenzhen Institute of Advanced Technology Chinese Academy of Sciences Guangdong Provincial Key Laboratory of Robotics and Intelligent System Shenzhen518055 China Shenzhen Institute of Artificial Intelligence and Robotics for Society SIAT Branch Shenzhen518055 China

ISBN: (数字)9781665469838

ISBN: (纸本)9781665469838

Medical palpation is an effective diagnosis method in which physicians use tactile sensation to diagnose a patient's pathology. Robotic palpation is a novel technique that leverages robots to assist medical diagnosis. The problem of tactile information loss in Robot-assisted Minimally Invasive Surgery (RMIS) has limited the development of the robot-assisted surgical system. Meanwhile, surgeons are difficult to acquire some key information about lesions only via visual feedback, such as tumor depth. To address the issue, we propose a tactile perception algorithm on the basis of the CNN-LSTM network, which achieves the depth recognition of hard inclusions in tissue phantoms. The method realizes the classification of twelve depths of hard inclusions. In addition, due to using hypergeometric distribution encoding, the proposed method can exploit the ordinal information of the labels to significantly improve the recognition accuracy rate. The experimental results on 720 real tactile data show that the average recognition rate is 96.45%. Compared with other state-of-the-art methods, the recognition accuracy rate of the proposed algorithm is the highest. © 2022 IEEE.

关键词： Tumors

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Gear fault diagnosis using gear meshing stiffness identified by gearbox housing vibration signals

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Frontiers of Mechanical Engineering 2022年第4期17卷 143-162页

作者： Xiaoluo YU Yifan HUANGFU Yang YANG Minggang DU Qingbo HE Zhike PENG State Key Laboratory of Mechanical System and Vibration Shanghai Jiao Tong UniversityShanghai 200240China Science and Technology on Vehicle Transmission Laboratory China North Vehicle Research InstituteBeijing 100072China

Gearbox fault diagnosis based on vibration sensing has drawn much attention for a long *** highly integrated complicated mechanical systems,the intercoupling of structure transfer paths results in a great reduction or even change of signal characteristics during the process of original vibration ***,using gearbox housing vibration signal to identify gear meshing excitation signal is of great significance to eliminate the influence of structure transfer paths,but accompanied by huge scientific *** paper establishes an analytical mathematical description of the whole transfer process from gear meshing excitation to housing *** gear meshing stiffness(GMS)identification approach is proposed by using housing vibration signals for two stages of inversion based on the mathematical ***,the linear system equations of transfer path analysis are first inverted to identify the bearing dynamic *** the dynamic differential equations are inverted to identify the *** simulation and experimental results demonstrate the proposed method can realize gear fault diagnosis better than the original housing vibration signal and has the potential to be generalized to other speeds and *** interesting properties are discovered in the identified GMS spectra,and the results also validate the rationality of using meshing stiffness to describe the actual gear meshing *** identified GMS has a clear physical meaning and is thus very useful for fault diagnosis of the complicated equipment.

关键词： gearbox fault diagnosis meshing stiffness identification transfer path signal processing

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Inchworm-Like Soft Robot with Anisotropic Magnetization for Untethered Crawling and Manipulating

Inchworm-Like Soft Robot with Anisotropic Magnetization for ...

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IEEE International Conference on robotics and Biomimetics

作者： Shishi Li Ruixuan Li Jinrong Wang Xianghe Meng Hui Xie State key Laboratory of Robotics and Systems Harbin Institute of Technology Harbin China

ISBN: (数字)9798331509644

ISBN: (纸本)9798331509651

Inchworm-like robots have shown promise in achieving multimodal movements, yet the integration of un-tethered locomotion and manipulation capabilities remains a persistent challenge in soft robotics. This paper presents a novel soft robot that addresses this challenge through an anisotropic magnetization distribution, achieved via 3D printing, enabling precise control over its three-dimensional structure and magnetic properties. This unique design allows for magnetic field-controlled locomotion with asymmetric time-varying postures, achieving a maximum stride length of 9.2 mm under an 80 mT field. The robot employs active friction manipulation between its feet, enabling an inchworm-like gait with alternating forefoot and rearfoot fixation. Additionally, the specific magnetization design permits independent control of grippers under the same magnetic field, facilitating complex manipulation tasks. The robot's potential in biomedical applications is demonstrated through a multi-region targeted drug delivery experiment. This integrated locomotion and manipulation platform shows promise for applications in confined spaces and represents a step forward in expanding the capabilities of soft robots for potential medical and industrial tasks.

关键词： Targeted drug delivery Service robots Magnetization Magnetic confinement Friction Soft robotics Three-dimensional printing Magnetic fields Grippers Perpendicular magnetic anisotropy

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Using Natural Radionuclides to Trace Sources of Suspended Particles in the Lower Reaches of the Yellow River

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Journal of Ocean University of China 2024年第1期23卷 99-108页

作者： ZHANG Han BURNETT CWilliam ZHANG Xiaojie ZHAO Shibin YANG Disong NAN Haiming YU Zhigang XU Bochao Frontiers Science Center for Deep Ocean Multispheres and Earth System and Key Laboratory of Marine Chemistry Theory and TechnologyMinistry of EducationOcean University of ChinaQingdao 266100China Laboratory for Marine Ecology and Environmental Science Qingdao National Laboratory for Marine Science and TechnologyQingdao 266071China College of Chemistry and Chemical Engineering Ocean University of ChinaQingdao 266100China Department of Earth Ocean and Atmospheric ScienceFlorida State UniversityTallahasseeFL 32306USA North China Sea Environmental Monitoring Center State Oceanic AdministrationKey Laboratory of Ecological Prewarning and Protection of Bohai SeaMNRQingdao 266033China Shandong Provincial Key Laboratory of Marine Ecological Environment and Disaster Prevention and Mitigation Qingdao 266033China

Natural radionuclides are powerful tools for understanding the sources and fate of suspended particulate matter(SPM).Particulate matter with different particle sizes behaves differently with respect to adsorption and *** analyzed the activi-ties and distribution characteristics of multiple natural radionuclides(238U,226Ra,40K,228Ra,7Be and 210Pbex)on size-fractionated SPM at the Lijin Hydrographic Station(Huanghe or Yellow River)every month over a one-year *** showed that medium silt(16–32µm)was the main *** expected,the activity of each radionuclide decreased with an increase of particle *** examined the sources of SPM with different particle sizes using activity ratios of 226Ra/238U,228Ra/226Ra,40K/238U and 7Be/210Pbex,and concluded that SPM with different particle sizes originated from different *** results indicate that fine SPM(<32µm)was mainly from the erosion of soil along the lower reaches of the Yellow River,while coarse SPM(>32µm)was mainly derived from resuspension of riverbed *** high runoff periods,the concentration of SPM increased significantly,and the pro-portion of fine particles originating upstream *** occurring radioactive isotopes,especially on size-fractionated par-ticles,are therefore seen as useful tracers to understand the sources and behaviors of riverine particles transported from land to sea.

关键词： the Yellow River suspended particulate matter size-fractions radionuclides sediment sources water elutriator

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Direct Contact Condensation Characteristics of Steam Injection into Cold-Water Pipe Under Rolling Condition 23rd

Direct Contact Condensation Characteristics of Steam Injecti...

引用

23rd Pacific Basin Nuclear Conference, PBNC 2022

作者： Wang, Zhiwei He, Yanping Duan, Zhongdi Huang, Chao Liu, Shiwen State Key Laboratory of Ocean Engineering Shanghai Jiao Tong University Shanghai China Science and Technology on Reactor System Design Technology Laboratory Nuclear Power Institute of China Chengdu China

ISBN: (纸本)9789819910229

Direct contact condensation (DCC) is widely occurred in nuclear power systems and leads to undesired phenomena such as condensation-induced water hammer. For ocean nuclear power ships, DCC is inevitable in the passive heat removal system and influenced by sea conditions. In this paper, the characteristics of DCC under rolling conditions are analyzed. The numerical model of DCC is established based on computational fluid dynamics approach. The VOF model, SST k–ω turbulence model and the additional inertia force model are incorporated to describe the liquid-gas two-phase flow under the rolling motion. The condensation model based on surface renewal theory (SRT) is used to simulate steam-water DCC phenomenon. The simulation results are compared with the experimental data and show reasonable agreement. The effects of rolling motion on DCC for steam injection into a horizontal pipe filled with cold water are numerically investigated. The results show that the additional inertial forces and the average condensation rate increase with the increase of the rolling angle and frequency. The reverse flow of the seawater induced by rolling motion leads to the accumulation of the steam at the lower part of the pipe, resulting in a large pressure pulse. With the increase of rolling angle and frequency, the pressure pulse induced by DCC increases. © 2023, The Author(s).

关键词： Condensation

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