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2024 International Conference on Mechatronics and Intelligent Control, ICMIC 2024

作者： Zhang, Shiling Fang, Sidun Liu, Minke Xiao, Qiang Zhou, Qian Economic and Technological Research Institute of State Grid Chongqing Electric Power Company Chongqing400000 China State Key Laboratory of Power Transmission Equipment & System Security and New Technology Chongqing University Chongqing400044 China State Grid Wanzhou Electric Power Supply Branch Chongqing404100 China

ISBN: (数字)9781510686847

ISBN: (纸本)9781510686830

According to wind power output curve, it can be seen that due to the significant influence of climate on wind power output, there is high degree of randomness and fluctuation in output, and there is no obvious characteristic pattern. From the historical wind power output curve of typical days during the peak season, it can be seen that in most years, wind power output is relatively high from 21:00 to 2:00 in the evening and relatively low from 14:00 to 17:00 in the afternoon. the wind power output shows the certain characteristic pattern: the cumulative wind power output is higher from 21:00 to 2:00 in the evening, and relatively lower from 14:00 to 17:00 in the *** 1500MW distributed photovoltaics were connected to the Chenjiaqiao Yuping area in the Chongqing load center area. Three permanent N-1 and N-2 fault calculations were conducted on the 500KV AC line in Chongqing, and it was found that the power grid could maintain stable operation. After the fault, the voltage of each 500kV bus was restored to 0.9p.u. There was no disconnection of distributed power sources in the Chenjiaqiao Yuping area. Three permanent N-1 and N-2 fault calculations were conducted on each 220kV AC line within the Chenjiaqiao Yuping area power grid, and it was found that the power grid could maintain stable operation. After the fault, the voltage of each 220kV bus in the Chenjiaqiao Yuping area was restored to 0.9p.u., there was no disconnection of distributed power sources. The paper provides control modes, open-loop control and closed-loop PI control, which is used for simulation analysis of frequency regulation in wind farms. © 2025 SPIE.

关键词： Open loop control

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The Measurement of the Elastic Modulus and Kinetic Friction Coefficient of Long Nanowires by the Micro-force Probe in the SEM Combined with Finite Element Simulation 4

The Measurement of the Elastic Modulus and Kinetic Friction ...

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4th IEEE International Conference on Nanoscience and technology, ICNST 2021

作者： Gao, Peng Gao, Jian Zou, Tao Rong, Weibin State Key Laboratory of Robotics and Systems Harbin Institute of Technology Harbin China

ISBN: (纸本)9780738112886

As an important nanomaterial, nanowires have important applications in micro-nano manufacturing, biomedicine, nano power generation and other fields, and are one of the current research hotspots. The traditional deformation-based nanowire dynamic friction measurement method only calculates the kinetic friction coefficient based on the deformation of the nanowire. However, due to the lack of force feedback, a certain pre-load force needs to be applied, which will also introduce errors and cause inaccurate measurement results. At the same time, it is easy to cause damage to the tungsten needles and nanowires, which is not suitable for nanowire samples with large aspect ratios. Aiming at the above problems, this paper proposes a method for measuring the elastic modulus and kinetic friction coefficient of Silicon (Si) nanowires (NWs) based on the combination of measurement of micro-force probes in the scanning electron microscope (SEM) and the simulation of the deflection of NWs. First, the corresponding relationship between the deformation of the nanowire and the force was obtained. Secondly, the influence of different elastic modulus and kinetic friction ratios on the deformation of nanowires were calculated by the simulation. Finally, the experimental data and simulation results are matched, and the elastic modulus and kinetic friction proportional coefficient with the smallest error is selected. The measurement method avoids the influence of the pre-load force on the measurement result, and at the same time avoids damage such as fracture of the nanowire and the probe due to excessive force. The effectiveness of this method is proven by comparing the measurement results in this article with the values in the relevant literature. ©2021 IEEE

关键词： Nanowires

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A novel two-stage Dissolved Gas Analysis fault diagnosis system based semi-supervised learning

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High Voltage 2022年第4期7卷 676-691页

作者： Xuemin Tan Chao Guo Ke Wang Fu Wan College of Control Engineering Chengdu University of Information TechnologyChengduChina State Grid Chengdu Power Supply Company ChengduChina China Electric Power Research Institute BeijingChina State Key Laboratory of Power Transmission Equipment and System Security and New Technology Chongqing UniversityChongqingChina

Dissolved Gas Analysis(DGA)is an important method for oil-immersed transformer fault ***,collecting labelled DGA data is difficult because the determi-nation of the transformer fault is time-consuming and expensive in the transformer substation,but DGA data without labels is easier to ***,the paper pro-posed a semi-supervised two-stage diagnostic system based DGA by using less labelled *** two-stage system includes a novel semi-supervised feature selection based Genetic Algorithm(GA)and Support Vector Machine(SVM)model(SSL-FS-GASVM)for selecting optimal features and a novel semi-supervised transformer fault diagnosis model based improved Artificial Fish Swarm Algorithm(AFSA)and SVM(SSL-IAFSA-SVM)for optimising the SVM ***,the performances of SSL-FS-GASVM and SSL-IAFSA-SVM models are tested and compared with traditional supervised diagnostic models combined with other optimisation methods,*** results show that the proposed two-stage system works in optimising features and parameters and has strong robustness in solving small sample classification problems.

关键词： fault diagnosis system

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Graph Convolutional Neural Network Algorithms for Bearing Remaining Useful Life Prediction: A Review

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Journal of Failure Analysis and Prevention 2025年 1-17页

作者： Jin, Zhenzhen Wu, Zhangwei Zhao, Jiayang He, Deqiang Zhuang, Yuan Guangxi Key Laboratory of Manufacturing System and Advanced Manufacturing Technology School of Mechanical Engineering of Guangxi University Nanning China Guangxi Key Laboratory of Precision Navigation Technology and Application Guilin University of Electronic Technology Guilin China State Key Laboratory of Heavy-duty and Express High-power Electric Locomotive Zhuzhou China

The precise prediction of the bearing's remaining useful life (RUL) is of paramount importance in ensuring equipment reliability within the mechanical industry. Currently, the realization of intelligent operational management and maintenance for mechanical systems utilizing deep learning (DL) is regarded as the foremost appealing research direction. Different from traditional DL techniques, the graph convolutional neural network (GCN) has become a promising technique for predicting the bearing RUL, due to its capability of handling non-Euclidean space and aggregating neighbor data. In the paper, the traditional RUL prediction methods are reviewed firstly. Subsequently, the principle of GCN is elaborated in detail, and classifications of its variants are presented. The taxonomy distinguishes spatial-GCN architectures from spectral-GCN frameworks. Finally, current GCN applications in bearing RUL prediction are reviewed, with emerging research challenges systematically outlined.

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Model heat source using actual distribution of laser power density for simulation of laser processing

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Journal of Central South University 2022年第10期29卷 3277-3293页

作者： WANG Gen-wang DING Ye GUAN Yan-chao WANG Yang YANG Li-jun State Key Laboratory of Robotics and Systems Harbin Institute of TechnologyHarbin 150001China School of Mechatronics Engineering Harbin Institute of TechnologyHarbin 150001China

The model of heat source(MHS) which reflects the thermal interaction between materials and laser during processing determines the accuracy of simulation results. To acquire desirable simulations results, although various modifications of heat sources in the aspect of absorption process of laser by materials have been purposed, the distribution of laser power density(DLPD) in MHS is still modeled theoretically. However, in the actual situations of laser processing, the DLPD is definitely different from the ideal models. So, it is indispensable to build MHS using actual DLPD to improve the accuracy of simulation results. Besides, an automatic modeling method will be benefit to simplify the tedious pre-processing of simulations. This paper presents a modeling method and corresponding algorithm to model heat source using measured DLPD. This algorithm automatically processes original data to get modeling parameters and provides a step MHS combining with absorption models. Simulations and experiments of heat transfer in steel plates irradiated by laser prove the mothed and the step MHS. Moreover, the investigations of laser induced thermal-crack propagation in glass highlight the signification of modeling heat source based on actual DLPD and demonstrate the enormous application of this method in the simulation of laser processing.

关键词： heat source laser processing distribution of power density digital images processing heat transfer

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Research on optical properties of human hepatoma cells using terahertz time-domain spectroscopy

Research on optical properties of human hepatoma cells using...

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2023 International Symposium on Ultrafast Phenomena and Terahertz Waves, ISUPTW 2023

作者： Guan, Hanxiao Qiu, Weihang Ma, Yehao Tian, Liangfei Cao, Yuqi Zhang, Guangxin College of Control Science and Engineering Zhejiang University State Key Laboratory of Industrial Control Technology Hangzhou China Zhejiang University College of Biomedical Engineering and Instrument Science Hangzhou China Ningbo University of Technology Robotics Institute Ningbo China

ISBN: (纸本)9798350317473

Terahertz technology is a non-invasive and label-free inspection method, promising for applications in various fields, especially in biomedical diagnosis. Terahertz radiation is capable for cell physiological and pathological status recognition due to its sensitivity to cell composition and structural information of biomacromolecular. In this paper, the transmission properties of glass, polymethyl methacrylate and polypropylene in THz regime were compared and polypropylene was selected as the petri dish material for cell adhesion due to its high transmission of terahertz wave. The time-domain and frequency-domain spectra, refractive index and absorption coefficient of hepatoma cell line Huh7 and normal cell line MIHA were analyzed. The experimental results showed significant distinction between the terahertz characteristic spectra of hepatoma cells and normal cells. This work can be helpful for applying terahertz technology in cancer detection at the cellular level. © 2023 IEEE.

关键词： Terahertz waves

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Late Paleozoic–Early Mesozoic tectonic evolution of the Zongwulong Shan-Qinghai Nanshan tectonic belt in the northern Qaidam continent， northern Tibet

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Journal of Earth Science 2025年

作者： Yonghui Zhao Chen Wu Jie Li Peter J.Haproff Lin Ding State Key Laboratory of Tibetan Plateau Earth System and Resources Environment (TPESRE)， Institute of Tibetan Plateau Research， Chinese Academy of Sciences University of Chinese Academy of Sciences Chongqing Key Laboratory of Complex Oil and Gas Field Exploration and Development， Chongqing University of Science and Technology Department of Earth and Ocean Sciences， University of North Carolina Wilmington

The Zongwulong Shan-Qinghai Nanshan tectonic belt of the northern Tibet Plateau experienced a protracted tectonic history， including the openings and closures of the Proto- and Paleo-Tethyan Oceans. Although the tectonic belt has been extensively studied， details regarding the tectonic processes involved in its development remain controversial. To better constrain the tectonic processes of this tectonic belt， we conducted detailed field geological mapping， zircon U-Pb geochronology， and whole-rock geochemical and Sr-Nd isotopic analyses. Our results show that intrusive rocks in the tectonic belt crystallized in ca. 292–233 Ma， perhaps in an arc/subduction setting. Geochemical and Sr-Nd isotopic data suggest that early Permian–late Triassic ultramafic-intermediate intrusions were sourced from the enriched mantle， whereas intermediate-acidic rocks were sourced from mixed crust-mantle. We present the tectonic model that involves: (1) Early Devonian–early Permian intracontinental extension occurred in the northern margin of the Qaidam continent (ca. 416 Ma–292 Ma); (2) Early Permian–late Triassic northward subduction of the Paleo-Tethyan Ocean resulted in arc magmatism (ca. 292 Ma–233 Ma); and (3) subsequent late Triassic intracontinental extension (ca. 233 Ma–215 Ma). Our results suggest that the late Paleozoic–early Mesozoic development of the Zongwulong Shan-Qinghai Nanshan was related to the opening， subduction， and slab retreat of the Paleo-Tethyan Ocean， which has key implications for the tectonic evolution of the northern Tibetan Plateau.

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The Performance Of A Novel P300 Brain-Computer Interface Paradigm With Electrical And Vibration Modes 12

The Performance Of A Novel P300 Brain-Computer Interface Par...

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12th International Conference on CYBER technology in Automation, Control, and Intelligent systems, CYBER 2022

作者： Chu, Chenxi Luo, Jingjing Du, Qiang Han, Xiangke Guo, Shijie and Robotics Academy for Engineering and Technology Fudan University Shanghai China Hebei University of Technology The Hebei Key Laboratory of Robot Perception and Human-Robot Interaction Department of the State Key Laboratory of Reliability and Intelligence of Electrical Equipment Tianjin China

ISBN: (数字)9781665472678

ISBN: (纸本)9781665472678

A novel tactile P300 paradigm was proposed for Brain-Computer Interface(BCI), in which only two types of stimuli was used to distinguish different targets. We also adapted an algorithm for intention recognition, which used spatial information to distinguish different stimulation sites, and frequency information to identify attended-target stimuli and disturbances. Our novel paradigm was verified on both vibration and electrical stimuli modes, and achieved an average classification accuracy of 95.21% for vibration stimuli mode and 94.88% for electrical stimuli mode, respectively. Furthermore, we evaluated performances of brain's functional connectivity by the correlation coefficient, and preliminarily explored the similarities and differences between vibration stimuli mode and electrical stimuli mode. © 2022 IEEE.

关键词： Brain computer interface

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Analytical Impact-Excitation Theory of Er/O/B Codoped Si Light-Emitting Diodes

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Physical Review Letters 2024年第24期132卷 246901-246901页

作者： Xiaoming Wang Jiajing He Ao Wang Kun Zhang Yufei Sheng Weida Hu Chaoyuan Jin Hua Bao Yaping Dan State Key Laboratory of Advanced Optical Communication Systems and Networks University of Michigan–Shanghai Jiao Tong University Joint Institute Aerospace Laser Technology and System Department Global Institute of Future Technology State Key Laboratory of Infrared Physics College of Information Science and Electronic Engineering

Er doped Si light-emitting diodes may find important applications in silicon photonics and optical quantum computing. These diodes exhibit an emission efficiency 2 orders of magnitude higher at reverse bias than forward bias due to impact excitation. However, physics of impact excitation in these devices remains largely unexplored. In this work, we fabricated an Er/O/B codoped Si light-emitting diode which exhibits a strong electroluminescence by the impact excitation of electrons inelastically colliding the Er ions. An analytical impact-excitation theory was established to predict the electroluminescence intensity and internal quantum efficiency which fit well with the experimental data. From the fittings, we find that the excitable Er ions reach a record concentration of 1.8×1019 cm−3 and up to 45% of them is in an excitation state by impact excitation. This work has important implications for developing efficient classical and quantum light sources based on rare earth elements in semiconductors.

关键词： Density of states Electrical conductivity Electrical properties Electroluminescence Ion impact & scattering LEDs

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Generation of polarization-multiplexed terahertz orbital angular momentum combs via all-silicon metasurfaces

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Light(Advanced Manufacturing) 2024年第3期5卷 120-129页

作者： Ming-Zhe Chong Yiwen Zhou Zong-Kun Zhang Jin Zhao Yue-Yi Zhang Chong-Qi Zhang Xiaofei Zang Chao-Hai Du Pu-Kun Liu Ming-Yao Xia School of Electronics Peking UniversityBeijing 100871China Terahertz Technology Innovation Research Institute and Shanghai Key Lab of Modern Optical SystemUniversity of Shanghai for Science and TechnologyNo.516 Jun Gong RoadShanghai 200093China State Key Laboratory of Advanced Optical Communication Systems and Networks School of ElectronicsPeking UniversityBeijing 100871China

Electromagnetic waves carrying orbital angular momentum(OAM),namely OAM beams,are important in various fields including optics,communications,and quantum ***,most current schemes can only generate single or several simple OAM ***-mode OAM beams are rarely *** paper proposes a scheme to design metasurfaces that can generate multiple polarization-multiplexed OAM modes with equal intervals and intensities(i.e.,OAM combs)working in the terahertz(THz)*** a proof of concept,we first design a metasurface to generate a pair of polarization-multiplexed OAM combs with arbitrary mode ***,another metasurface is proposed to realize a pair of polarization-multiplexed OAM combs with arbitrary locations and intervals in the OAM *** results agree well with full-wave simulations,verifying a great performance of OAM combs *** method may provide a new solution to designing high-capacity THz devices used in multi-mode communication systems.

关键词： Metasurfaces Terahertz Orbital angular momentum comb Polarization multiplexing

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