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International Applied Computational Electromagnetics Society Symposium (ACES)

作者： Ying Zhao Wenjie Neng Zhen Zhang Dazhi Ding College of computer and information engineering (College of artificial intelligence) Nanjing Tech University Nanjing China State Key Laboratory of Millimeter Waves Nanjing China China Key System & Integrated Circuit Co. Ltd. Wuxi China Department of communication engineering Nanjing University of Science and Technology Nanjing China

A mixed potential integral equation (MPIE) method combined with anisotropic impedance boundary conditions is proposed for the analysis of scattering from layered media. In this method, anisotropic surface conductivity is modeled by the impedance boundary conditions. As a result, only these surfaces need to be discretized. Numerical example is demonstrated to show the accuracy of this method.

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Calculation of DC line-induced potential in the same corridor under different working conditions

Calculation of DC line-induced potential in the same corrido...

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Electrical Engineering and Mechatronics technology (ICEEMT), IEEE International Conference on

作者： Lei Liu Minchuan Liao Lei Jia Bin Li Wenxin Wan National Engineering Research Center of UHV Technology and New Electrical Equipment (NERCUHV&EE) China Southern Power Grid Electric Power Research Institute Guangzhou China State Key Laboratory of Alternate Electrical Power System with Renewable Energy Sources (NCEPU)

When multiple lines are installed in the same corridor, high amplitude induced voltage may be generated between the lines, posing a danger to equipment and personal safety. Especially for high-voltage DC lines, when one circuit is in live operation and the other is in standby or maintenance status, a high induced potential will occur when the wire is not grounded. On the one hand, it will affect the insulation coordination and protection setting of the DC system. On the other hand, it will also affect the ion current and synthetic electric field on the ground. This article studies the calculation method of the induced potential of DC lines installed in the same corridor under different working conditions, establishes a calculation model for operating lines under different voltage conditions, and calculates and analyzes the influence of factors such as induced voltage, operating mode, and mutual spacing of DC lines installed in the same corridor.

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Gan/Moo3 N-N Heterojunction Based Anti-Humidity Gas Sensor for No2 Real-Time Monitoring

SSRN

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SSRN 2024年

作者： Hong, Yutao Han, Dan Duan, Qi Li, Donghui He, Xiuli Li, Bing Liang, Hua Li, Hongwei Sang, Shengbo Shanxi Key Laboratory of Micro Nano Sensors & Artificial Intelligence Perception College of Integrated Circuits Taiyuan University of Technology Taiyuan030024 China Key Lab of Advanced Transducers and Intelligent Control System Ministry of Education Taiyuan University of Technology Taiyuan030024 China State Key Laboratory of Transducer Technology Aerospace Information Research Institute Chinese Academy of Sciences Beijing100190 China Shanxi Province Key Laboratory of Oral Diseases Prevention and New Materials Shanxi Medical University School Hospital of Stomatology Shanxi Taiyuan030001 China Shanxi Province Cancer Hospital Shanxi Hospital Affiliated to Cancer Hospital Chinese Academy of Medical Sciences Cancer Hospital Affiliated to Shanxi Medical University Taiyuan030000 China University of Chicago United States

Effective and accurate detection of NO2 gas is crucial for protecting the environment and public health. In this work, balsam pear-like GaN/MoO3 porous nanosheets (GaN/MoO3) composites were synthesized by in situ assembling, the hydrothermal method, and the nitridation process to detect NO2. A series of characterization methods were used to manifest the successful synthesis and to analyze the morphology and elemental composition features of GaN/MoO3 composites. The results of the gas-sensing experiments show that, at the operating temperature of 225℃, the gas sensor based on the optimal ratio of GaN/MoO3 composites exhibits a 25-fold lower limit of detection for NO2 than that of MoO3, with a reduction of baseline resistance drift. Further, the response value of the sensor based on GaN/MoO3 composites to 200 ppm NO2 (44.74) is 4.36 times higher than that of the sensor based on pure GaN, with an improvement in stability. Meanwhile, the sensor possessed excellent repeatability, selectivity, stability, and splendid anti-humidity ability at 15-70% RH. The improved gas-sensing performance is ascribed to the unique microstructure of both GaN and MoO3 and the heterojunction effect between them. In addition, we constructed a real-time NO2 monitoring device based on the gas-sensing characteristic of GaN/MoO3, which realizes the alarm of excessive concentrations of NO2. Overall, this work provides a way to improve the ability of NO2 monitoring for the sensors of MoO3-based composites. © 2024, The Authors. All rights reserved.

关键词： III-V semiconductors

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A deep learning system for predicting time to progression of diabetic retinopathy

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NATURE MEDICINE 2024年第2期30卷 358-359页

作者： [Anonymous] Shanghai Belt and Road International Joint Laboratory for Intelligent Prevention and Treatment of Metabolic Disorders Department of Computer Science and Engineering School of Electronic Information and Electrical Engineering Shanghai Jiao Tong University Department of Endocrinology and Metabolism Shanghai Sixth People’s Hospital Affiliated to Shanghai Jiao Tong University School of Medicine Shanghai Diabetes Institute Shanghai Clinical Center for Diabetes Shanghai China MOE Key Laboratory of AI School of Electronic Information and Electrical Engineering Shanghai Jiao Tong University Shanghai China Department of Ophthalmology Huadong Sanatorium Wuxi China Department of Ophthalmology Shanghai Sixth People’s Hospital Affiliated to Shanghai Jiao Tong University School of Medicine Shanghai China Department of Ophthalmology and Visual Sciences The Chinese University of Hong Kong Hong Kong China Singapore Eye Research Institute Singapore National Eye Centre Singapore Singapore Department of Computer Science and Engineering The Hong Kong University of Science and Technology Hong Kong China Department of Chemical and Biological Engineering The Hong Kong University of Science and Technology Hong Kong China State Key Laboratory of Ophthalmology Zhongshan Ophthalmic Center Sun Yat-sen University Guangdong Provincial Key Laboratory of Ophthalmology and Visual Science Guangzhou China Department of Ophthalmology Peking Union Medical College Hospital Peking Union Medical College Chinese Academy of Medical Sciences Beijing China Medical Records and Statistics Office Shanghai Sixth People’s Hospital Affiliated to Shanghai Jiao Tong University School of Medicine Shanghai China Department of Geriatrics Tongji Hospital Tongji Medical College Huazhong University of Science and Technology Wuhan China National Engineering Research Center for Big Data Technology and System Services Computing Technology and System Lab Cluster and Grid Computing Lab School of Computer Science and Tech

We developed and validated a deep learning system (termed DeepDR Plus) in a diverse, multiethnic, multi-country dataset to predict personalized risk and time to progression of diabetic retinopathy. We show that DeepDR Plus can be integrated into the clinical workflow to promote individualized intervention strategies for the management of diabetic retinopathy.

关键词： Diabetes complications Machine learning Predictive markers

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An Indoor Map Matching Algorithm Based on Improved Particle Filter

An Indoor Map Matching Algorithm Based on Improved Particle ...

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International Conference on Information, Communication and Networks (ICICN)

作者： Baoguo Yu Haonan Jia Xinjian Wang Shuang Li State Key Laboratory of Satellite Navigation System and Equipment Technology The 54th Research Institute of China Electronics Technology Group Corporation Shijiazhuang China College of Instrument Science and Engineering Southeast University Nanjing China

ISBN: (纸本)9781665490832

In order to correct the location result of indoor map matching algorithm in inaccessible area, a map matching algorithm based on particle filter multiple weight update is proposed in this paper. The map matrix is built on the raster map to make full use of the map information, and the five weights of map are calculated by the map matrix to improve indoor map matching accuracy. Meanwhile, the modified wall-penetrating detection method is realized by testing the values of map information matrix elements in the circular particle trajectory to reduce the map matching algorithm calculation amount. The accuracy and effectiveness of the proposed algorithm are verified by simulation and field measurement.

关键词： Atmospheric measurements Computational modeling Layout Particle measurements Particle filters Trajectory Detection algorithms

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Research on high-precision silicon-based integrated optical temperature sensor

Research on high-precision silicon-based integrated optical ...

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2021 Applied Optics and Photonics China: Optoelectronics and Nanophotonics, AOPC 2021

作者： Wang, Yimeng Shu, Haowen Han, Xiuyou School of Optoelectronic Engineering and Instrumentation Science Dalian University of Technology Dalian116024 China State Key Laboratory of Advanced Optical Communications System and Networks Department of Electronics School of Electronics Engineering and Computer Science Peking University Beijing100871 China

ISBN: (纸本)9781510649996

Integrated optical temperature sensor nowadays has attracted extensive interests thanks to its merits of high accuracy, electromagnetic immunity, and compact size compared with the traditional solutions. So far, most of the state-of-art integrated optical temperature sensors work by spectrum detection of a resonant cavity, which has certain limitations in terms of response time and cost, and it is difficult to achieve high level integration of the overall system. To solve the above problems, in this paper we use silicon-based integrated micro-ring array technology for high-precision real-time temperature sensing. By constructing a monotonic relationship between the output light intensity of the micro-ring array with the variation of the temperature, rapid and high-precision temperature measurement could be realized. Depending on different practical scenarios, the system can be customized to adapt specific temperature measurement range and resolution. Through the optimized design, the system accuracy could be better than 60mK covering temperature range of 297K∼415K, with response time better than 20μs. © COPYRIGHT SPIE. Downloading of the abstract is permitted for personal use only.

关键词： Temperature measurement

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Simulation of Lightning Electromagnetic Field Propagation Based on Simplified 3D Modeling of a Mountainous Terrain *Note: Sub-titles are not captured in Xplore and should not be used

Simulation of Lightning Electromagnetic Field Propagation Ba...

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International Symposium on Lightning Protection (XII SIPDA)

作者： Xianglong Zeng Yue Qi Xiaowei Xu Ke Wang Qing Yang State Grid Chongqing Electric Power Company Chongqing China State Key Laboratory of Power Distribution Equipment & System Security and New Technology School of Electrical Engineering Chongqing University Chongqing China Electric Power Research Institute of Yunnan Power Grid Co. Ltd. Yunnan China

The propagation effects of lightning electromagnetic fields could be influenced by topographical factors. In this paper, a three-dimensional simplified terrain model is established and the FDTD method is used to simulate the propagation of lightning electromagnetic fields along mountainous terrain. The impact of the number of contiguous hills on the waveforms of the electromagnetic field at distant range is taken into account. The increasing number of hills results in an enhancement effect on the amplitude of electromagnetic fields and a delay of the arrival time of the electromagnetic fields. The oscillation of the electromagnetic pulse and the undulating orography are closely related. The spatial and temporal evolution of lightning electromagnetic fields along mountainous terrain is analyzed, and the reflected wave off the hill is found to be the main cause of the increment of the peak electromagnetic field.

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An ultrasound imaging algorithm for enhancing the imaging quality of piezoelectric transducer array ultrasound imaging systems

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Sensors and Actuators A: Physical 2025年 392卷

作者： Wang, Peng Wang, Kunlin Li, Qianwen Tong, Lin Shen, Yue Chen, Sirui Wang, Jue Wang, Ping State Key Laboratory of Power Transmission Equipment and System Security and New Technology Chongqing University Chongqing400044 China

Ultrasonic imaging, as a fundamental methodology in nondestructive testing, achieves defect characterization through acoustic interaction mechanisms including reflection at impedance boundaries, microstructural scattering, and frequency-dependent attenuation. However, conventional delay-and-sum (DAS) beamforming compromises spatial resolution and contrast performance due to inherent limitations such as main lobe broadening, sidelobe leakage artifacts, and coherent noise interference. The spatial spectrum coherence factor (SSCF) algorithm proposed in this paper is based on the difference in the energy distribution of the spatial spectrum of the echo data after the Fourier transform, and enhances the differentiation between the defects and the background region by the product of the low-frequency component and the total energy;the coherence energy factor (CEF) algorithm proposed in this paper combines the 2-norm energy characterization of the echo signal with the symbolic coherence weighting to suppress the background clutter and reserve the details of the defects. Then the SSCF methodand CEF method are fused to obtain the SSCF-CEF beamforming algorithm, which achieves a more significant enhancement of the imaging effect. The experiment utilizes 20# carbon steel test block, aluminum test block and actual rail test block to verify the effectiveness of the algorithm. The results show that: compared with DAS, the SSCF-CEF algorithm improves the contrast ratio (CR) by 438.26 % and reduces the array performance index (API) by 47.14 % in 20# steel specimen;the half-peak full-width value is optimized to 1.78 mm in the aluminum specimen experiment, which is 53.9 % lower than that of DAS, and compressed API by 90.21 % compared with DAS and achieved a jump of CR by 172.39 %;the CR in the rail inspection scenario is improved by 287.16 %, while the API is reduced by 91.81 %. In addition, SSCF and CEF alone are significantly better than traditional generalized coherence factor and

关键词： Acoustic emission testing

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Effect of Electric Field Intensity on Microphysical Parameters of Natural Ester from the Perspective of Molecular Structure

Effect of Electric Field Intensity on Microphysical Paramete...

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International Conference on High Voltage Engineering and Application, ICHVE

作者： Wenyu Ye Jian Hao Xiong Liu Wei Qin Yingkai Long Qian Wang State Key Laboratory of Power Transmission Equipment & System Security and New Technology Chongqing University Chongqing China State Grid Chongqing Electric Power Co. Chongqing Electric Power Research Institute Chongqing China

ISBN: (数字)9781665407502

ISBN: (纸本)9781665407519

Natural ester, as a kind of renewable and environmental insulating material, has created broad opportunities for the development of electrical industry. To better explore the mechanism and principle of natural ester discharge, the effects of electrical field the space configuration, ionization energy, excitation energy and frontier orbital of the natural ester molecules were studied by density functional theory. The results show that the natural ester molecular chains deflect toward the electric field and its dipole moment increases with the increase of electric field intensity. The ionization energy of natural ester molecules decreases significantly with increasing electric field intensity. Among all molecules, the ionization energy of glycerol triolein has the most obvious decrease. The electric field has great influence on the excitation process of natural ester. The excitation energy of natural ester molecules will decrease in different electrical field. The HOMO of natural ester molecules gradually moved in the direction of the electric field, while its LUMO gradually moved towards the source of the electric field. The energy gap of natural ester decreased significantly under the influence of electric field. This paper provides a strong theoretical guidance for the research of natural ester discharge and improving its breakdown voltage.

关键词： Space vehicles Industries Renewable energy sources Ionization High-voltage techniques Fault location Discharges (electric)

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Collaborative turning and jumping control of a cyborg locust via sensory stimulation

Collaborative turning and jumping control of a cyborg locust...

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International Conference on Electrical, Control and Instrumentation Engineering (ICECIE)

作者： Peng Liu Songsong Ma Shen Liu Yao Li Bing Li School of Mechanical Engineering and Automation Harbin Institute of Technology Shenzhen China State Key Laboratory of Robotics and Systems Harbin Institute of Technology Shenzhen China

ISBN: (纸本)9781665449670

In this study, we describe the first-ever demonstration of the turning and jumping control of locusts based on electrical stimulation, which can realize a cyborg jumper. In terms of perception, walking distance, speed, payload, maneuverability, and adaptability to complex environments, cyborgs can reveal unmatchable advantages to insect-scale artificial robots. Herein, live locusts (Locusta migratoria) were selected as the study platform. Antennae and cercus stimulations using electrical pulses were applied to elicit the insect to turn and jump. We examined both the turning angle and the angular velocity by tuning the stimulus amplitude or frequency. It is found the turning rate induced by antenna stimulation can be graded. Besides, the stimulation of the cercus at the distal abdomen triggered the jump reliably. Moreover, the directional jumping control of the locust was achieved by the collaboration of turning and jumping control. Such results provide the potential to establish a more precise and more efficient model to develop a direction-controllable cyborg jumper.

关键词： Legged locomotion Wireless communication Protocols Insects Collaboration Electrical stimulation Turning

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