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Carbon nanotube films with ultrahigh thermal-shock and thermalshock-fatigue resistance characterized by ultra-fast ascending shock testing

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Nano Research 2024年第8期17卷 6777-6784页

作者： Mingquan Zhu Shijun Wang Yunxiang Bai Feng Gao Zhenxing Zhu Congying Wang Peng Zhang Hao Jin Hui Zhang Luqi Liu Zhiping Xu Xinghong Zhang Fei Wei Zhong Zhang CAS Key Laboratory of Nanosystem and Hierarchical Fabrication CAS Center for Excellence in NanoscienceNational Center for Nanoscience and TechnologyChinese Academy of SciencesBeijing 100190China University of Chinese Academy of Sciences Beijing 100049China Beijing Key Laboratory of Green Chemical Reaction Engineering and Technology Department of Chemical EngineeringTsinghua UniversityBeijing 100084China Department of Engineering Mechanics Tsinghua UniversityBeijing 100084China National Key Laboratory of Science and Technology on Advanced Composites in Special Environments Center for Composite Materials and StructuresHarbin Institute of TechnologyHarbin 150001China CAS Key Laboratory of Mechanical Behavior and Design of Materials Department of Modern MechanicsUniversity of Science and Technology of ChinaHefei 230027China

The exploration of material failure behavior not only involves defining its limits and underlying mechanisms but also entails devising strategies for improvement and protection in extreme ***'ve pioneered an advanced multi-scale,high-speed ascending thermal shock testing platform capable of inducing unprecedented heat shocks at rates surpassing 105℃/*** meticulous examination of the thermal shock responses of carbon nanotube(CNT)films,we've achieved remarkable *** employing an innovative macro-scale synchronous tightening and relaxing approach,we've attained a critical temperature differential in CNT films that exceeds an exceptional 2500℃—surpassing any previously reported metric for highperformance,thermal-shock-resistant ***,these samples have demonstrated exceptional resilience,retaining virtually unchanged strength even after enduring 10,000 thermal shock cycles at temperatures exceeding 1000℃.Furthermore,our research has revealed a novel thermal shock/fatigue failure mechanism that fundamentally diverges from conventional theories centered on thermal stress.

关键词： carbon nanotubes failure behavior thermal shock characterization

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Nanodiamond/Ti_(3)C_(2) MXene-coated quartz crystal microbalance humidity sensor with high sensitivity and high quality factor

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Rare Metals 2024年第6期43卷 2719-2729页

作者： Yao Yao Qiao Chen Yan-Qi Li Xian-He Huang Wei-Wei Ling Zhe-MiaoXie Jia-QiWang Chang-Ming Chen College of Communication Engineering Chengdu University of Information TechnologyChengdu 610225China School of Automation Chongqing University of Posts and TelecommunicationsChongqing 400065China School of Automation Engineering University of Electronic Science and Technology of ChinaChengdu 611731China Advanced Micro-/Nano-Devices Lab Department of Systems Design EngineeringUniversity of WaterlooWaterlooON N2L 3GlCanada

To address the challenge of achieving both high sensitivity and a high quality factor in quartz crystal microbalance(QCM)humidity sensors,a nanodiamond(ND)/Ti_(3)C_(2)MXene composite-coated QCM humidity sensor was *** material characteristics of ND,Ti_(3)C_(2)MXene,and ND/Ti_(3)C_(2)MXene composite were analyzed by transmission electron microscopy(TEM)and Fourier transform infrared(FTIR)*** experimental results demonstrated that the hydrophilic ND nanoparticles coated on Ti_(3)C_(2) MXene nanosheet prevented the self-stacking of Ti_(3)C_(2)MXene and enhanced the sensitivity of Ti_(3)C_(2) MXene-based QCM humidity ***,the high mechanical modulus of Ti_(3)C_(2) MXene material helped ND/Ti_(3)C_(2)MXene composite-coated QCM humidity sensor to achieve a high quality factor(>20,000).ND/Ti_(3)C_(2)MXene compositecoated QCM humidity sensor exhibited a sensitivity of 82.45 Hz/%RH,a humidity hysteresis of 1.1%RH,fast response/recovery times,acceptable repeatability,and good stability from 11.3%RH to 97.3%*** response mechanism of ND/Ti_(3)C_(2) MXene composite-coated QCM humidity sensor was analyzed in combination with a bi-exponential kinetic adsorption ***,the potential application of ND/Ti_(3)C_(2)MXene composite-coated QCM humidity sensor was demonstrated through its frequency response to wooden blocks with different moisture contents.

关键词： Humidity sensor Quartz crystal microbalance Nanodiamond Ti_(3)C_(2)MXene High quality factor

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A Phase-Dependent and EMG-Driven Variable Stiffness Control Strategy for Upper Limb Rehabilitation Robot

A Phase-Dependent and EMG-Driven Variable Stiffness Control ...

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2024 IEEE International Conference on Robotics and Biomimetics, ROBIO 2024

作者： Li, Pengcheng Guo, Shuxiang Li, Chunying Southern University of Technology and Science Department of Electronic and Electrical Engineering Shenzhen China Aerospace Center Hospital School of Life Science Key Laboratory of Convergence Medical Engineering System and Healthcare Technology Ministry of Industry and Information Technology Beijing Institute of Technology Beijing China

ISBN: (纸本)9781665481090

Bilateral training is a widely adopted approach in upper limb rehabilitation due to its effectiveness and ease of implementation. Variable stiffness actuators enhance this approach by facilitating compliant human-machine interaction, ensuring both comfort and safety. However, optimizing stiffness levels for individual subjects to maximize training effectiveness remains a significant challenge. The difficulty of different task phases varies across subjects, necessitating customized robotic assistance. This paper proposes an adaptive stiffness modulation strategy that leverages the cyclic nature of rehabilitation tasks. An adaptive frequency oscillator is employed for real-time phase detection, while a tuning rule, based on motion tracking error and muscular activation, dynamically adjusts stiffness levels. Experimental validation with two participants demonstrated that the proposed strategy effectively promotes affected arm motion and tailors assistance to the user's specific needs. © 2024 IEEE.

关键词： Human robot interaction

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MgxNi1−xO-based Gas Sensors with Various Mg/Ni Ratios

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Sensors and Materials 2024年第5期36卷 1815-1823页

作者： Lam, Artde Donald Kin-Tak Qiu, Qi-Rui Chang, Sheng-Po Chang, Shoou-Jinn School of Design & Straits College of Engineering Fujian University of Technology No. 3 Xueyuan Road University Town Fujian Province Fuzhou City China Institute of Microelectronics Department of Electrical Engineering National Cheng Kung University Tainan City70101 Taiwan Department of Microelectronics Engineering National Kaohsiung University of Science and Technology Kaohsiung City811 Taiwan

Considering the advancement of contemporary industrialization and urban development, a consequential escalation of air quality deterioration has led to the emergence of diseases and disasters. In this research, we endeavor to harness the properties of MgNiO for the fabrication of a gas sensor designed specifically for the detection of NO2. In contrast to conventional NiO gas sensors, our findings indicate a noticeable enhancement in the sensor's NO2 gas responsiveness with increasing proportion of Mg. Remarkably, the utilization of a Mg0.5Ni0.5O film exhibits the most promising outcomes, that is, heightened responsiveness and commendable selectivity. This improvement of performance can be attributed to the increase in oxygen vacancies within the film and consequent alterations in film resistance, which collectively contribute to the overall improvement of sensor responsivity. © 2024 M Y U Scientific Publishing Division. All rights reserved.

关键词： Magnesium compounds

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Emotion Recognition in Real Time for Personalized Healthcare Using Digital Twin Approach 2

Emotion Recognition in Real Time for Personalized Healthcare...

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2nd IEEE International Conference on Advances in Information technology, ICAIT 2024

作者： Karthikeyani, B. Yuvaraj, D. Parimalam, T. Parthasarathi, P. Nandha Arts and Science College India CollegeGobi India Department of Computer Science and Design Kongu Engineering College Perundurai India Department of Computer Science Nandha Arts and Science College Perundurai India Department of Computer Science and Engineering Bannari Amman Institute of Technology Sathyamangalam India

ISBN: (纸本)9798350383867

Facial Emotional Recognition (FER) in healthcare can help to monitoring the patient by analyzing the emotional state of the patient through various emotional states. In medical industry it can help to trace the emotional state changes and diagnosis the pattern which are mapped respective to the patient's history. Digital twin technology is transforming healthcare systems and improving patient care, clinical operations, predictive analytics, and training and simulation by integrating virtual simulations and emerging analytic mechanism through ML and DL techniques. By allocating resources, monitoring workflow, and providing individualized patient care, these algorithms reduce healthcare operations and assist in determining an individual's risk. Since FER has lot of technical challenges like illumination, obstruction issues also high implementation cost. To solve these issues, the FER system will embed with the digital twin technology to provide a better result from real time sensing cameras also analyzing the result and guiding for a better treatment of an individual. We propose a system of end to end framework which produces best results in minimum amount of time with maximum accuracy. This real time implementation will help all the healthcare centers/industry to study an individual's health status as well as early prediction of diseases with effective treatment steps. © 2024 IEEE.

关键词： Deep learning

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GCD-Sampling: A General Cross-scale Decoupled Sampling for Point Cloud 39

GCD-Sampling: A General Cross-scale Decoupled Sampling for P...

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39th Annual AAAI Conference on Artificial Intelligence, AAAI 2025

作者： Dai, Tao Wang, Yanzi Xiong, Jianyu Zha, Yaohua Xia, Shu-Tao Zhu, Zexuan College of Computer Science and Software Engineering Shenzhen University China National Engineering Laboratory for Big Data System Computing Technology Shenzhen University China Tsinghua Shenzhen International Graduate School Tsinghua University China Shenzhen City Key Laboratory of Embedded System Design Shenzhen China

ISBN: (纸本)157735897X

Sampling strategy (e.g., fixed farthest point sampling) of point cloud has been an essential step for developing practical solutions in 3D computer vision tasks. Previous fixed sampling is simple, but suffer from suboptimal performance for downstream tasks. To adapt to target networks properly, adaptive sampling methods with trainable parameters have been recently developed to enhance the performance. However, existing adaptive sampling methods still suffer from the over-coupling problem of target network, and thus become model-specific, which limits their practical applications. To address this issue, we propose a novel general cross-scale decoupled sampling method (GCD-sampling) for point cloud, which consists of original feature cache, cross-scale feature fusion and convex combination learning for better feature extraction. To reduce the coupling relationship with the target task network, our method only utilizes the point cloud coordinates as the input and output of itself. Besides, we introduce an arbitrary scale structure to enable parameter sharing across multi-scale sampling in point cloud networks. Extensive experiments on different architectures demonstrate the effectiveness of our method over other existing adaptive sampling methods. © 2025, Association for the Advancement of Artificial Intelligence (***). All rights reserved.

关键词： Feature extraction

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Organic polaritonic light-emitting diodes with high luminance and color purity toward laser displays

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Light(science & Applications) 2024年第9期13卷 1956-1963页

作者： Jianbo De Ruiyang Zhao Fan Yin Chunling Gu Teng Long Han Huang Xue Cao Cunbin An Bo Liao Hongbing Fu Qing Liao Beijing Key Laboratory for Optical Materials and Photonic Devices Department of ChemistryCapital Normal University100048 BeijingChina Beijing Special Engineering Design and Research Institute 100028 BeijingChina Institute of Process Engineering Chinese Academy of Sciences100190 BeijingChina Institute of Molecule Plus Tianjin University and Collaborative Innovation Center of Chemical Science and Engineering(Tianjin)300072 TianjinChina School of Materials Science and Engineering Hunan University of Science and Technology411201 XiangtanHunanChina

Achieving high-luminescence organic light-emitting devices(OLEDs)with narrowband emission and high color purity is important in various optoelectronic *** displays exhibit outstanding advantages in next-generation display technologies owing to their ultimate visual experience,but this remains a great ***,we develop a novel OLED based organic single *** strongly coupling the organic exciton state to an optical microcavity,we obtain polariton electroluminescent(EL)emission from the polariton OLEDs(OPLEDs)with high luminance,narrow-band emission,high color purity,high polarization as well as excellent optically pumped polariton ***,we evaluate the potential for electrically pumped polariton laser through theoretical analysis and provide possible *** work provides a powerful strategy with a material–device combination that paves the way for electrically driven organic single-crystal-based polariton luminescent devices and possibly lasers.

关键词： pumped laser polarization

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Research on Sensorless Control of Double High Frequency Injection SynRM Based on Static Shaft Torque Ripple Suppression 2

Research on Sensorless Control of Double High Frequency Inje...

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2nd IEEE International Power Electronics and Application Symposium, PEAS 2023

作者： Wang, Jianyuan Jing, Hanghui Li, Yingjie Wang, Haoyu School of Electrical Engineering Xi'an University of Technology Shaanxi Xi'an China School of System Design and Intelligent Manufacturing South University of Science and Technology of China Guangdong Shenzhen China

ISBN: (纸本)9798350313765

When the synchronous reluctance motor runs without position sensor control, there is a strong coupling nonlinear problem of quadrature axis inductance, which affects the precise of rotor position detect and cannot ensure the stability of the motor at low speed range. Control in the low speed range of the motor, a sensorless control method of double high-frequency injection based on static axis torque ripple suppression is proposed. By establishing a nonlinear function model of flux and current of the quadrature axis, the Angle error caused by the cross-coupling of the inductance of the quadrature axis is reduced. The high frequency signal is injected into the d-q axis at the same time to reduce the high frequency torque ripple contained in the high frequency amplitude in the traditional high frequency injection, and the rotor position estimation accuracy and the transient performance of the motor are improved. Finally, the effectiveness of the control scheme is verified by experiments on a 1.5kW synchronous reluctance motor pair drag and load experimental platform. © 2023 IEEE.

关键词： cross saturation double high frequency square wave injection high frequency torque ripple off-line parameter identification synchronous reluctance motor

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A trajectory-level robot skill learning method based on fuzzy systems

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science China(Information sciences) 2025年第5期68卷 38-52页

作者： Chao ZENG Zhen DENG Boyang TI Yongsheng GAO Department of Computer Science University of Liverpool School of Mechanical Engineering and Automation Fuzhou University State Key Laboratory of Robotics Shenyang Institute of Automation Chinese Academy of Sciences Institutes for Robotics and Intelligent Manufacturing Chinese Academy of Sciences State Key Laboratory of Robotics and System Harbin Institute of Technology

Learning from demonstration(LfD) allows for the effective transfer of human manipulation skills to a robot by building a model that represents these skills based on a limited number of demonstrated ***,a skilllearning model that can comprehensively satisfy multiple requirements,such as computational complexity,modeling accuracy,trajectory smoothness,and robustness,is still ***,this work aims to provide such a model by employing fuzzy ***,we introduce an LfD model named Takagi-Sugeno-Kang fuzzy system-based movement primitives(TSKFMPs),which exploits the advantages of the fuzzy theory for effective robotic imitation learning of human *** work formulates the TSK fuzzy system and gradient descent(GD) as imitation learning models,leveraging recent advancements in GD-based optimization for fuzzy *** study takes a two-step strategy.(ⅰ) The input-output relationships of the model are established using TSK fuzzy systems based on demonstration *** this way,the skill is encoded by the model parameter in the latent space.(ⅱ) GD is used to optimize the model parameter to increase the modeling accuracy and trajectory *** further explain how learned trajectories are adapted to new task scenarios through local *** conduct multiple tests using an open dataset to validate our method,and the results demonstrate performance comparable with those of other ***,we implement it in a real-world case study.

关键词： robot skill learning movement primitives TSK fuzzy systems gradient descent robotics

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Fabrication and Measurement of Cosputtered Indium Gallium Oxide Ultraviolet Photodetectors

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Sensors and Materials 2024年第5期36卷 1825-1834页

作者： Lam, Artde Donald Kin-Tak Huang, En-Min Chang, Sheng-Po Chang, Shoou-Jinn School of Design & Straits College of Engineering Fujian University of Technology No. 3 Xueyuan Road University Town Fujian Province Fuzhou City China Institute of Microelectronics Department of Electrical Engineering National Cheng Kung University Tainan City70101 Taiwan Department of Microelectronics Engineering National Kaohsiung University of Science and Technology Kaohsiung City811 Taiwan

Indium gallium oxide (IGO) ultraviolet (UV) photodetectors (PDs) were fabricated by cosputtering. The power of the gallium oxide target was fixed at 80 W, while the power of the indium oxide target was varied at 20, 30, 40, and 80 W. As the amount of indium doping increased, the dark current and response decay time increased. Furthermore, the sensitivity and responsivity of the PDs also increased, reaching the maximum values of 5.20 × 103 at 30 W/80 W and 1.72 × 102 A/W at 40 W/80 W, respectively. However, excessive indium doping resulted in excessively high dark current and increased sensitivity and response decay time. Therefore, proper control of indium doping can lead to high-performance IGO UV PDs. © 2024 M Y U Scientific Publishing Division. All rights reserved.

关键词： Gallium compounds

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