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12th Annual Meeting of CSEE Study Committee of HVDC and Power Electronics, HVDC 2023

作者： Gao, Lu Lin, Junjie Su, Minghui Lin, Chang Ji, Feng Wei, Bingtao State Grid Smart Grid Research Institute Co. Ltd Beijing China Laboratory of DC Grid Technology & Simulation Address Beijing China State Key Laboratory of Advanced Transmission Technology Beijing China

ISBN: (纸本)9781839539848

The electromagnetic transient simulation of power system is related to solving ill-conditioned matrix equations, which can not get satisfactory numerical results by the conventional method. In this paper, the regularization method is used to solve the ill-conditioned matrix equations in electromagnetic transient simulation. The numerical results show that the regularization method can solve the ill-conditioned matrix in electromagnetic transient simulation precisely. © The Institution of Engineering & technology 2023.

关键词： Numerical methods

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Influence of crevice width on sulfate-reducing bacteria(SRB)-induced corrosion of stainless steel 316L

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Corrosion Communications 2021年第4期4卷 33-44页

作者： Cong Wu Zhaopeng Wang Zhan Zhang Bowei Zhang Guojia Ma Qiong Yao Zhaohong Gan Junsheng Wu Xiaogang Li Institute for Advanced Materials and Technology University of Science and Technology Beijing Aeronautical Key Laboratory of Advanced Surface Engineering Technology China Aviation Manufacturing Technology Institute Key Laboratory of Space Lauching Site Reliability Technology

In the present work, the distribution of sulfate-reducing-bacteria(SRB) inside the crevice and the effect of crevice width on SRB-induced corrosion of stainless steel 316L(SS 316L) were systematically investigated. A cambered crevice configuration consisting of a convex lens and a wire beam electrode(WBE) was employed to measure the current and potential distributions under different crevice widths. Subsequently, scanning electronic microscopy(SEM), electrochemical impedance spectroscopy(EIS) and X-ray photoelectron spectroscopy(XPS) were adopted to study SRB-induced corrosion behavior of SS 316L in different crevice locations. Results show that crevice width plays an essential role in corrosion on SS 316L in crevice environment with SRB. The most severe corrosion with dense pits occurred at the crevices with 150 μm in width due to the combined effects of microbiological corrosion and crevice corrosion. In narrow crevices, corrosion is much slighter since SRB can hardly enter into the crevices to induce corrosion. In contrast, the crevices with 700 μm in width suffer the mildest corrosion because the influence of crevice corrosion is negligible with a weakened crevice corrosion tendency. Additionally, it was found that SRB could affect the composition of the passive film and destroy its compactness, thus accelerate the crevice corrosion of SS 316L in artificial seawater. The findings of this work are beneficial to understanding the mechanisms of MIC-induced corrosion in various environments.

关键词： SS 316L SRB WBE Crevice corrosion

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Pumping and sliding of droplets steered by a hydrogel pattern for atmospheric water harvesting

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National Science Review 2023年第12期10卷 181-192页

作者： Wei Zhang Qinghua Ji Gong Zhang Zhenao Gu Haozhi Wang Chengzhi Hu Huijuan Liu Zhiyong Jason Ren Jiuhui Qu Center for Water and Ecology State Key Joint Laboratory of Environment Simulation and Pollution ControlSchool of Environment Tsinghua University Key Laboratory of Drinking Water Science and Technology Research Center for Eco-Environmental Sciences Chinese Academy of Sciences University of Chinese Academy of Sciences Joint School of National University of Singapore and Tianjin University International Campus of Tianjin University Key Laboratory of Advanced Ceramics and Machining Technology(Ministry of Education) School of Materials Science and EngineeringTianjin University Department of Civil and Environmental Engineering and Andlinger Center for Energy and the Environment Princeton University

Atmospheric water harvesting is an emerging strategy for decentralized and potable water supplies. However,water nucleation and microdroplet coalescence on condensing surfaces often result in surface flooding owing to the lack of a sufficient directional driving force for shedding. Herein, inspired by the fascinating properties of lizards and catfish, we present a condensing surface with engineered hydrogel patterns that enable rapid and sustainable water harvesting through the directional pumping and drag-reduced sliding of water droplets. The movement of microscale condensed droplets is synergistically driven by the surface energy gradient and difference in Laplace pressure induced by the arch hydrogel patterns. Meanwhile, the superhydrophilic hydrogel surface can strongly bond inner-layer water molecules to form a lubricant film that reduces drag and facilitates the sliding of droplets off the condensing surface. Thus, this strategy is promising for various water purification techniques based on liquid–vapor phase-change processes.

关键词： atmospheric water harvesting droplet manipulation bio-inspired condensation

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A Method of Constructing Fine-Grained Pose Evaluation Model 1

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18th International Conference on Intelligent Information Hiding and Multimedia Signal Processing, IIH-MSP 2022

作者： Song, Zhen Zhang, Longfei Li, Haoyu Wu, Yufeng Ding, Gangyi Advanced Research Center for Digitalization of Traditional Drama of The Central Academy of Drama Beijing100710 China Key Laboratory of Digital Performance and Simulation Technology Beijing Institute of Technology Beijing100081 China

ISBN: (数字)9789819901050

ISBN: (纸本)9789819901043

In the field of computer vision, human pose estimation (HPE) is an important direction. However, in some fields that require professional actions or motions, researchers will deal with poses with high diversity, strongly instantaneous actions and complex behaviors, and with problems such as lack of enough dataset, algorithm iteration lag, and poor robustness, it is difficult for conventional CV methods to recognize many kinds of poses well. Aiming to the problems above, we propose a method of training fine-grained pose estimation model and building pose dataset based multi-views in this paper. And during the work, we use the operation of filtering as optimization approach to improve the accuracy of results. By filtering data, those wrongly recognized key points can be corrected to some extent and the missing key points or poses can be estimated based on the continuity of motion. The filter method can also improve the smoothness of curve, so the pose sequences can be more fluent and conform the kinetics after the operation. Meanwhile, there sometimes may be errors about the results of 3D pose reconstruction based on 2D pose because of occlusions, changes of environment. In this situation, choosing 2D pose results from appropriate views instead of all the views can also improve the accuracy of final results. Moreover, for the environment with several persons, we finish the work of matching human cross-different views by combining with the method of predicting depths of root key points. From the experiments, the method can increase the average precision (AP) up to 2.2%, which demonstrate the feasibility and reusability of our method. © 2023, The Author(s), under exclusive license to Springer Nature Singapore Pte Ltd.

关键词： Reusability

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Trajectory Tracking for Cable-driven Underactuated Manipulator Based on Udwadia-Kalaba Theory 3

Trajectory Tracking for Cable-driven Underactuated Manipulat...

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3rd IEEE International Conference on Electronic technology, Communication and Information, ICETCI 2023

作者： Hu, Sanbao Jin, Xiangsui Zhu, Hengjia Wuhan University of Technology Hubei Key Laboratory of Advanced Technology of Automotive Components Wuhan430070 China Civil Aviation University of China College of Aeronautical Engineering Tianjin300300 China

ISBN: (纸本)9798350398410

The explicit dynamic model of the cable-driven underactuated manipulator is established to calculate the constraint force by second-order constraints using the Udwadia-Kalaba theory and taking into account the trajectory tracking requirements of the cable-driven underactuated manipulator as the external constraints. Following the decomposition of the constraint force, the analytical expression for the cable tension is obtained. Furthermore, the numerical simulation in MATLAB shows that, when affected by the previously calculated cable tension, the manipulator's tracking trajectory may precisely match the requirements. This approach lessens modeling complexity without the Lagrangian multiplier compared to conventional Lagrangian modeling techniques. © 2023 IEEE.

关键词： Manipulators

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Emitter Beam State Sensing Based on Convolutional Neural Network and Received Signal Strength

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Journal of Shanghai Jiaotong university(Science) 2024年第6期29卷 1017-1022页

作者： JIANG Yilin LI Xiang ZHANG Haoping College of Information and Communication Engineering Harbin Engineering UniversityHarbin 150001China Key Laboratory of Advanced Marine Communication and Information Technology Ministry of Industry and Information TechnologyHarbin Engineering UniversityHarbin 150001China China Ordnance Industry Group Aviation Ammunition Research Institute Co. Ltd.Harbin 150030China

In this paper,a classification method based on convolutional neural network(CNN)and received signal strength(RSS)is proposed to solve the problem of non-cooperative emitter beam state sensing in electrical situational ***,sensor coordinates,and received signal frequency are taken as the input features of CNN,while real state is taken as the output of *** increase the RSS gradient contained in the eigenvector,a multi-layer sensor array is proposed to measure *** results show that the proposed method is robust to array location disturbance,and has the ability to generalize the mismatches in target location and main lobe beam width between first nulls.

关键词： electromagnetic situation awareness convolutional neural network(CNN) received signal strength(RSS) emitter beam pointing

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Realizing the air brazing of ZrO_(2) ceramics through Al metal

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Journal of Materiomics 2022年第3期8卷 662-668页

作者： Yaotian Yan Baishen Liu Tianxiong Xu Liang Qiao Shaohua Qin Jian Cao Junlei Qi State Key Laboratory of Advanced Welding and Joining Harbin Institute of TechnologyHarbin150001China Key Laboratory of Materials Design and Quantum Simulation College of ScienceChangchun UniversityChangchun130022China School of Materials Science and Engineering Harbin Institute of TechnologyHarbin150001China

The exploration towards cost-effective filler metal for ceramics joining has always been the key issues for ceramics ***,we reveal that the Al metal prefers to spread on the ZrO_(2) based ceramic under the air heating condition,due to the geometric limit effects by in-situ formed dense Al2O3 *** by this,the joining of ZrO_(2) based ceramics was realized in air with Al metal as filler,through the diffusion of Al towards ceramic *** Al element can induce obvious interfacial bonding effect on Al2O3 layer and ZrO_(2) ceramic,where the hybridization among the Al-p,Zr-d and O-p orbitals plays a key *** in-situ formed Al2O3 layer on Al filler surface is vital for forming the fine interface(shear strength of~36 MPa),which results in the relief of lattice mismatch and peak stress at ceramic-filler metal transition interface.

关键词： Ceramics Density functional theory Interfacial behavior Diffusion

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Designing hard wear-resistant conductors by introducing high-plasma-energy heterogeneous metals into transition metal nitrides

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Journal of Materials Science & technology 2023年第26期157卷 213-219页

作者： Yuankai Li Chaoquan Hu Yao Wu Zhenan Qiao Yifan Cheng Zhiqing Gu Gang Gao Weitao Zheng State Key Laboratory of Superhard Materials Key Laboratory of Automobile Materials of Ministry of EducationSchool of Materials Science and EngineeringJilin Provincial International Cooperation Key Laboratory of High-Efficiency Clean Energy MaterialsJilin UniversityChangchun 130012China State Key Laboratory of Inorganic Synthesis and Preparative Chemistry College of ChemistryJilin UniversityChangchun 130012China SINOPEC Star Co.Ltd. Beijing 100083China Key Laboratory of Medical Electronics and Digital Health of Zhejiang Province College of Information Science and EngineeringJiaxing UniversityJiaxing 314001China National Key Laboratory of Science and Technology on Advanced Composites in Special Environments Harbin Institute of TechnologyHarbin 150080China State Key Laboratory of Automotive Simulation and Control Jilin UniversityChangchun 130025China

*** Hard and wear-resistant conductors(HWCs)refer to functional films with simultaneously high hardness,high wear resistance,and good electrical *** have important applica-tions such as next-generation sliding electrical contacts,high-end conductive probe-tip,and oval hole guides for the precision rolling mill[1-4],which has drawn extensive research ***,it is still challenging to integrate high hardness,super wear resis-tance,and high electrical conductivity in one ***-ally,researchers have mainly alloyed the highly conductive met-als Cu,Au,and Pt to improve their hardness and wear resistance.

关键词： wear high electrical

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MilChat: A Large Language Model and Application for Military Equipment

MilChat: A Large Language Model and Application for Military...

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Machine Learning and Natural Language Processing (MLNLP), International Conference on

作者： Liu Xue Liu Jie Zhu Peipei Xiang Tao National Key Laboratory of Complex Aviation System Simulation Southwest China Institute of Electronic Technology Chengdu China

ISBN: (数字)9798350354973

ISBN: (纸本)9798350354980

To offer the military personnel a good service of assisting them to get information about enemy's equipment outside Internet, we build a system named MilChat which includes a large language model that has the ability to generate texts and an application which is easy to use. The model of MilChat is fine-tuned by the method of LoRA with military datasets from the basic model, Qwen-7B-Chat which is opensource and has good performance. After fine-tuning, the new model has higher scores than the basic one. Besides, we use the method of Prompt Learning to limit the answers into a standard format. Therefore, it is more accurate and professional than the basic model. This study has also a value of industrial application.

关键词： Accuracy Large language models Machine learning Natural language processing Libraries Internet Personnel Standards Military equipment

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Intelligent vehicle path tracking based on feedback linearization and LQR under extreme conditions 41

Intelligent vehicle path tracking based on feedback lineariz...

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第41届中国控制会议

作者： Yi Sun Qikun Dai Jun Liu Xu Zhao Hongyan Guo College of Communication Engineering Jilin University The State Key Laboratory of Automotive Simulation and Control Jilin University The Department of Aviation Electrical Engineering Jilin Institute of Chemical Technology

ISBN: (数字)9789887581536

ISBN: (纸本)9781665482561

It proposes a path following control strategy for intelligent vehicles under extreme conditions based on feedback linearization and linear quadratic regulator(LQR).Firstly,the vehicle dynamics model and the vehicle kinematics model are established,and the affine nonlinear vehicle system model under the extreme condition is established by these two ***,the complex nonlinear vehicle system model is linearized using the feedback linearization method to obtain a simpler linear system ***,according to the obtained linear vehicle system model,the LQR method is used to design the tracking controller to obtain the optimal control input,so as to ensure the stability of the system and the optimality of the target,and realize the intelligent vehicle path *** affirm the effectiveness of the tracking method,a series of Carsim/Simulink co-simulation experiments are carried *** results show that the effects of path tracking combined with feedback linearization and LQR are significantly better than the other two methods,thus the path tracking method proposed in the paper is effectively verified.

关键词： Feedback Linearization LQR Affine Nonlinear Vehicle System Model Extreme conditions Path Tracking

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