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Electrochemical and biological performance of hierarchical platinum-iridium electrodes structured by a femtosecond laser

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Microsystems & Nanoengineering 2022年第5期8卷 161-170页

作者： Linze Li Changqing Jiang Wanru Duan Zhiyan Wang Feng Zhang Changgeng He Tiangang Long Luming Li National Engineering Research Center of Neuromodulation School of Aerospace EngineeringTsinghua UniversityBeijing 100084China School of Mechanical Engineering and Automation Fuzhou UniversityFuzhou 350108China Department of Neurosurgery China International Neuroscience Institute(CHINA-INI)Xuanwu HospitalCapital Medical UniversityBeijing 100053China Lab of Spinal Cord Injury and Functional Reconstruction China International Neuroscience Institute(CHINA-INI)Xuanwu HospitalCapital Medical UniversityBeijing 100053China Precision Medicine&Healthcare Research Center Tsinghua-Berkeley Shenzhen InstituteTsinghua UniversityShenzhen 518071China IDG/McGovern Institute for Brain Research at Tsinghua University Beijing 100084China Institute of Epilepsy Beijing Institute for Brain DisordersBeijing 100093China

Neural electrode interfaces are essential to the stimulation safety and recording quality of various bioelectronic *** recently proposed hierarchical platinum-iridium(Pt-Ir)electrodes produced by femtosecond lasers have exhibited superior electrochemical performance in vitro,but their in vivo performance is still *** this study,we explored the electrochemical performance,biological response,and tissue adhesion of hierarchical Pt-Ir electrodes by implantation in adult rat brains for 1,8,and 16 *** smooth Pt-Ir electrodes were used as a *** results showed that the electrochemical performance of both electrodes decreased and leveled off during ***,after 16 weeks,the charge storage capacity of hierarchical electrodes stabilized at~16.8 mC/cm^(2),which was 15 times that of the smooth control electrodes(1.1 mC/cm^(2)).Moreover,the highly structured electrodes had lower impedance amplitude and cutoff frequency *** similar histological response to smooth electrodes indicated good biocompatibility of the hierarchically structured Pt-Ir *** their superior in vivo performance,the femtosecond laser-treated Pt-Ir electrode showed great potential for neuromodulation applications.

关键词： platinum performance electrode

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Neural Network Robust Control Based on Computed Torque for Lower Limb Exoskeleton

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Chinese Journal of mechanical engineering 2024年第2期37卷 83-99页

作者： Yibo Han Hongtao Ma Yapeng Wang Di Shi Yanggang Feng Xianzhong Li Yanjun Shi Xilun Ding Wuxiang Zhang School of Mechanical Engineering and Automation Beihang UniversityBeijing 100191China Beihang Goer(WeiFang)Intelligent Robot Co. Ltd.Beihang UniversityWeifangChina Research Center of Satellite Technology Harbin Institute of TechnologyHarbinChina Beijing Xinfeng Aerospace Equipment Co. LtdBeijingChina

The lower limb exoskeletons are used to assist wearers in various scenarios such as medical and industrial *** modeling errors of the exoskeleton in different application scenarios pose challenges to the robustness and stability of its control *** Radial Basis Function(RBF)neural network is used widely to compensate for modeling *** order to solve the problem that the current RBF neural network controllers cannot guarantee the asymptotic stability,a neural network robust control algorithm based on computed torque method is proposed in this paper,focusing on trajectory *** innovatively incorporates the robust adaptive term while introducing the RBF neural network term,improving the compensation ability for modeling *** stability of the algorithm is proved by Lyapunov method,and the effectiveness of the robust adaptive term is verified by the *** wearing the exoskeleton under different walking speeds and scenarios were carried out,and the results show that the absolute value of tracking errors of the hip and knee joints of the exoskeleton are consistently less than 1.5°and 2.5°,*** proposed control algorithm effectively compensates for modeling errors and exhibits high robustness.

关键词： Lower limb exoskeleton Model compensation RBF neural network Computed torque method

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One-Step Laser-Induced Dissolvable PVA Mask for 3D Soft Carbon Electrode Array 38

One-Step Laser-Induced Dissolvable PVA Mask for 3D Soft Carb...

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38th IEEE International Conference on Micro Electro mechanical systems, MEMS 2025

作者： Wang, Xuanqi Xue, Kai Bai, Ruiyu Huang, Ye Zhang, Zimo You, Xiaoli Wang, Minghao Chang, Honglong Ji, Bowen Northwestern Polytechnical University Unmanned System Research Institute China Northwestern Polytechnical University National Key Laboratory of Unmanned Aerial Vehicle Technology Integrated Research and Development Platform of Unmanned Aerial Vehicle Technology China Northwestern Polytechnical University Ministry of Education Key Laboratory of Micro and Nano Systems for Aerospace School of Mechanical Engineering China Northwestern Polytechnical University Sanhang Institute for Brain Science and Technology China Northwestern Polytechnical University Institute of Medical Research China Hangzhou Dianzi University Moe Engineering Research Center of Smart Microsensors and Microsystems College of Electronics and Information China

ISBN: (纸本)9798331508890

This paper introduces a 3D soft carbon electrode array, fabricated through a one-step laser-induced process integrating a water-dissolvable polyvinyl alcohol (PVA) mask. This approach achieves precise conical microstructures and robust conductive channels using hybrid MWCNT@PDMS conductive paste. The soft carbon electrode sites with a 3D conical microstructure are designed to enhance proximity to neural tissue, thereby enhancing electrocorticogram (ECoG) signal quality and enabling effective neural stimulation. The electrode array demonstrates remarkable stretchability (25% over 1,000 cycles without failure) and stability (equivalent to 66 days in vivo). Compared to conventional materials, our electrodes exhibit superior electrochemical properties, including lower impedance (9.7 kΩ at 1 kHz) and higher signal-to-noise ratio (SNR, 61.7 dB). Thus, this one-step process is a cost-effective, scalable solution for recording and modulating central or peripheral neural tissues. © 2025 IEEE.

关键词： Carbon electrodes

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CDP-GAN:Near-Infrared and Visible Image Fusion Via Color Distribution Preserved GAN

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IEEE/CAA Journal of Automatica Sinica 2022年第9期9卷 1698-1701页

作者： Jun Chen Kangle Wu Yang Yu Linbo Luo the School of Automation Hubei Key Laboratory of Advanced Control and Intelligent Automation for Complex SystemsEngineering Research Center of Intelligent Technology for Geo-ExplorationMinistry of EducationChina University of GeosciencesWuhan 430074China the Shanghai Institute of Technical Physics Key Laboratory of Infrared System Detecting and Imaging TechnologyChinese Academy of SciencesShanghai 200083China the School of Mechanical Engineering and Electronic Information China University of GeosciencesWuhan 430074China

Dear Editor,This letter is concerned with dealing with the great discrepancy between near-infrared(NIR)and visible(VS)image fusion via color distribution preserved generative adversarial network(CDP-GAN).Different from the global discriminator in prior GAN,conflict of preserving NIR details and VS color is resolved by introducing an attention guidance mechanism into the ***。

关键词： details dealing preserving

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Short-term multi-step-ahead sector-based traffic flow prediction based on the attention-enhanced graph convolutional LSTM network (AGC-LSTM)

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Neural Computing and Applications 2024年 1-20页

作者： Zhang, Ying Xu, Shimin Zhang, Linghui Jiang, Weiwei Alam, Sameer Xue, Dabin College of General Aviation and Flight Nanjing University of Aeronautics and Astronautics Nanjing China State Key Laboratory of Air Traffic Management System Nanjing China College of Computer Science and Technology Nanjing University of Aeronautics and Astronautics Nanjing China School of Information and Communication Engineering Beijing University of Posts and Telecommunications Beijing China Air Traffic Management Research Institute School of Mechanical & ampAerospace Engineering Nanyang Technological University Singapore Singapore Department of Land Surveying and Geo-Informatics The Hong Kong Polytechnic University Hong Kong

Accurate sector-based air traffic flow predictions are essential for ensuring the safety and efficiency of the air traffic management (ATM) system. However, due to the inherent spatial and temporal dependencies of air traffic flow, it is still a challenging problem. To solve this problem, some methods are proposed considering the relationship between sectors, while the complicated spatiotemporal dynamics and interdependencies between traffic flow of route segments related to the sector are not taken into account. To address this challenge, the attention-enhanced graph convolutional long short-term memory network (AGC-LSTM) model is applied to improve the short-term sector-based traffic flow prediction, in which spatial structures of route segments related to the sector are considered for the first time. Specifically, the graph convolutional networks (GCN)-LSTM network model was employed to capture spatiotemporal dependencies of the flight data, and the attention mechanism is designed to concentrate on the informative features from key nodes at each layer of the AGC-LSTM model. The proposed model is evaluated through a case study of the typical enroute sector in the central–southern region of China. The prediction results show that MAE reduces by 14.4% compared to the best performing GCN-LSTM model among the other five models. Furthermore, the study involves comparative analyses to assess the influence of route segment range, input and output sequence lengths, and time granularities on prediction performance. This study helps air traffic managers predict flight situations more accurately and avoid implementing overly conservative or excessively aggressive flow management measures for the sectors. © The Author(s) 2024.

关键词： Forecasting

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Safety-Critical Control Under Multiple State and Input Constraints and Application to Fixed-Wing UAV

Safety-Critical Control Under Multiple State and Input Const...

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IEEE Conference on Decision and Control

作者： Donggeon David Oh Dongjae Lee H. Jin Kim Department of Mechanical and Aerospace Engineering Seoul National University Seoul South Korea Department of Aerospace Engineering and the Automation and Systems Research Institute (ASRI) Seoul National University Seoul South Korea

This study presents a framework to guarantee safety for a class of second-order nonlinear systems under multiple state and input constraints. To facilitate real-world applications, a safety-critical controller must consider multiple constraints simultaneously, while being able to impose general forms of constraints designed for various tasks (e.g., obstacle avoidance). With this in mind, we first devise a zeroing control barrier function (ZCBF) using a newly proposed nominal evading maneuver. By designing the nominal evading maneuver to 1) be continuously differentiable, 2) satisfy input constraints, and 3) be capable of handling other state constraints, we deduce an ultimate invariant set, a subset of the safe set that can be rendered forward invariant with admissible control inputs. Thanks to the development of the ultimate invariant set, we then propose a safety-critical controller, which is a computationally tractable one-step model predictive controller (MPC) with guaranteed recursive feasibility. We validate the proposed framework in simulation, where a fixed-wing UAV tracks a circular trajectory while satisfying multiple safety constraints including collision avoidance, bounds on flight speed and flight path angle, and input constraints.

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Design and Flight Test of a Compact and Rapidly-Deployable Air-Launched Inflatable-Winged Aircraft

Design and Flight Test of a Compact and Rapidly-Deployable A...

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AIAA Science and Technology Forum and Exposition, AIAA SciTech Forum 2025

作者： Ge, Hang Xu, Yixiang Sun, Donglei Chen, Xinmin Chen, Boyang School of Aerospace Faculty of Science and Engineering University of Nottingham Ningbo China Zhejiang Ningbo315100 China Department of Mechanical Materials and Manufacturing Engineering UNNC-NFTZ Blockchain Laboratory University of Nottingham Ningbo China Zhejiang Ningbo315100 China Advanced Intelligent Manufacturing Research Group Control System Lab University of Nottingham Ningbo China Zhejiang Ningbo315100 China Zhejiang Provincial Engineering Research Center of Special Aircraft Ningbo Institute of Materials Technology & Engineering Chinese Academy of Sciences Zhejiang Ningbo315100 China

ISBN: (数字)9781624107238

ISBN: (纸本)9781624107238

In this research, a high-altitude, compact and rapidly deployable, air-launched, inflatablewinged aircraft is designed, developed, and flight-tested to investigate the flight characteristics of inflatable-winged aircraft as well as the in-flight inflation and dynamic deployment properties when launched from various carriers. To start with, two types of inflatable wings employing different materials have been designed, fabricated, and tested, the tests including structural characteristics tests, inflation properties tests, and low-Reynolds-number wind-tunnel tests. A full-scale 30-kilogram prototype unmanned aerial vehicle with inflatable wings was then designed, assembled and tested with some basic low-altitude flights to verify the feasibility of the aerodynamic layout and the trim and stability and control characteristics. Finally, low- and high-altitude in-flight launches will be conducted to study the dynamic deployment properties and high-altitude flight characteristics of this design. © 2025, American institute of Aeronautics and Astronautics Inc, AIAA. All rights reserved.

关键词： Wind tunnels

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Creep fatigue life prediction of pipe joints under complex bending-torsional loading using large-scale nonlinear structural analysis

Yosetsu Gakkai Ronbunshu/Quarterly Journal of the Japan Weld...

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Yosetsu Gakkai Ronbunshu/Quarterly Journal of the Japan Welding Society 2024年第2期42卷 78-88页

作者： Kitani, Yuji Ikushima, Kazuki Arai, Masayuki Nishida, Hidetaka Ma, Ninshu Shibahara, Masakazu Joining and welding research Institute Osaka University Japan Division of Aerospace and Marine-System Engineering Graduate School of Engineering Osaka Metropolitan University Japan Department of Mechanical Engineering Tokyo University of Science Japan The Chugoku Electric Power Company Incorporated Japan

With the expansion of clean energy, thermal power plants will be used as a load-following power plant. Thus, temperature and strain variations will occur during load fluctuations including start and stop of operation, and large-diameter pipes will be damaged by fatigue in addition to creep due to internal pressure. Especially, in a bent pipe such as an elbow pipe, bending and torsion are simultaneously applied. Therefore, it is important to predict the creep fatigue life in a bending and torsional stress environment. In this study, analysis method for creep fatigue life using Norton's law, ductile exhaustion law, and Manson-Coffin's law is proposed. Next, the proposed method was applied to the prediction of creep fatigue life of the test samples for thermal power plant piping, and the validity of the proposed method was verified by comparing creep fatigue life obtained by proposed method and that obtained by an experiment. In addition, the proposed method is applied to the prediction of creep fatigue life with load fluctuations and investigation of the effects of load fluctuation interval on creep fatigue life. © 2024 Japan Welding Society. All rights reserved.

关键词： Finite element method

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A Variational Bayesian Maximum Correntropy Cubature Kalman Filter with Adaptive Kernel Bandwidth

A Variational Bayesian Maximum Correntropy Cubature Kalman F...

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IEEE International Conference on Signal Processing, Communications and Computing (ICSPCC)

作者： Zhenwei Li Shuaijie Ouyang Yongmei Cheng Huibin Wang Kezheng Chen School of Automation Northwestern Polytechnical University Xi'an China CSSC System Engineering Research Institute Beijing China School of Aerospace Engineering Zhengzhou University of Aeronautics Zhengzhou China

This paper focuses on the estimation problem in the presence of non-Gaussian measurement noise encountered in dynamic systems. The proposed solution is based on a variational Bayesian maximum correntropy cubature Kalman filter with adaptive kernel bandwidth that uses the Mahalanobis distance to adapt in real time the kernel bandwidth. The proposed filter is compared to some recent cubature Kalman filtering approaches, using the univariate nonstationary growth model benchmark. The obtained results demonstrate that the proposed method leads to the estimated values less affected by non-Gaussian measurement noises than other recent cubature Kalman-based filter.

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Robust Attitude Control of Multibody Aircraft with Preview-Based Control Compensation 6th

Robust Attitude Control of Multibody Aircraft with Preview...

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6th China Aeronautical Science and Technology Conference, CASTC 2023

作者： Qi, Pengyuan Li, Qingxian Mou, Quanrun Wang, Yinan Research Institute for Frontier Science Beihang University Beijing100191 China School of Automation Science and Electrical Engineering Beihang University Beijing100191 China Large Aircraft Advanced Training Center Beihang University Beijing100191 China Department of Mechanical Materials and Aerospace University of Liverpool LiverpoolL69 3BX United Kingdom

ISBN: (纸本)9789819988662

This paper investigates the robust attitude control for wingtip-connected multibody aircraft, using preview-based control compensation mechanism to address the issues of inherent wingtip couplings. A constrained multibody dynamics model is first derived to obtain the nonlinear and linearised formulations for multibody aircraft. The H∞ control is employed to synthesize the pitch angle and forward velocity controller in the longitudinal channel, while the H∞ preview control is employed to synthesize the roll angle and yaw rate controller in the lateral channel. The preview control scheme enables the usage of future reference commands as feedforward information to synthesize appropriate control compensation to reduce the impact of wingtip couplings between adjacent aircraft units. Simulation studies conducted based on the nonlinear model show that the preview-based H∞ control system is able to achieve better control effectiveness and disturbance rejection performance, compared to the baseline regular H∞ control system without preview. These demonstrate that the mechanism of control compensation can greatly benefit the flight control of multibody aircraft. © 2024, Chinese Society of Aeronautics and Astronautics.

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