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Computational and experimental investigations of a microfluidic mixer for efficient iodine extraction using carbon tetrachloride enhanced with gas bubbles

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Chinese Physics B 2023年第11期32卷 518-526页

作者： Siddique Muhammad Kashif 孙林李松晶 Department of Fluid Control and Automation School of Mechatronics EngineeringHarbin Institute of TechnologyHarbin 150001China

Numerous studies have been conducted on microfluidic mixers in various microanalysis systems, which elucidated the manipulation and control of small fluid volumes within microfluidic chips. These studies have demonstrated the ability to control fluids and samples precisely at the microscale. Microfluidic mixers provide high sensitivity for biochemical analysis due to their small volumes and high surface-to-volume ratios. A promising approach in drug delivery is the rapid microfluidic mixer-based extraction of elemental iodine at the micro level, demonstrating the versatility and the potential to enhance diagnostic imaging and accuracy in targeted drug delivery. Micro-mixing inside microfluidic chips plays a key role in biochemical analysis. The experimental study describes a microfluidic mixer for extraction of elemental iodine using carbon tetrachloride with a gas bubble mixing process. Gas bubbles are generated inside the microcavity to create turbulence and micro-vortices resulting in uniform mixing of samples. The bubble mixing of biochemical samples is analyzed at various pressure levels to validate the simulated results in computational fluid dynamics(CFD). The experimental setup includes a high-resolution camera and an air pump to observe the mixing process and volume at different pressure levels with time. The bubble formation is controlled by adjusting the inert gas flow inside the microfluidic chip. Microfluidic chip-based gas bubble mixing effects have been elaborated at various supplied pressures.

关键词： microfluidic mixer iodine extraction CFD simulation micro-mixing properties

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Developing a mechatronics-Twin Framework for Effective Exploration of Operational Behaviors of Prosthetic Sockets

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SN Computer Science 2024年第2期5卷 205页

作者： Chen, Dejiu Ottikkutti, Suranjan Tahmasebi, Kaveh Nazem Unit of Mechatronics and Embedded Control Systems KTH Royal Institute of Technology Stockholm Sweden

A Stewart platform is a six-degree-of-freedom parallel manipulator widely used as the motion base for flight simulators and antenna positioning systems, among others. This work presents a novel mechatronics-twin framework that integrates such a manipulator with advanced biomechanical models and simulations for effective exploration of operational behaviors of prosthetic sockets with amputees. By means of the biomechanical models and simulations, the framework allows the users to first analyze the fundamental operational characteristics of individual amputees according to their specific body geometries, pelvis-femur structures, and sizes of transfemoral sockets. Such operational characteristics are then fed to one Stewart platform as the reference control signals for the generation of dynamic loads and behaviors of prosthetic sockets that are otherwise difficult to observe or realize with the real amputees. Experiments in form of integration testing show that the proposed control strategy is capable of generating expected dynamic operational conditions. Currently, the mechatronics-twin framework supports a wide range of biomechanical configurations and the quantification of the respective intra-socket load conditions for socket design optimization and anomaly detection. © 2024, The Author(s).

关键词： Biomechanical modeling Cyber-physical system Force-control Human-in-the-loop mechatronics-Twin Prosthetics Stewart manipulator Transfemoral amputee

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A Symmetric-Actuating Linear Piezoceramic Ultrasonic Motor Capable of Producing a Scissoring Effect

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Research 2024年第1期2023卷 571-581页

作者： Zhanmiao Li Xingyu Yi Rongqi Zhu Zhonghui Yu Xiaoting Yuan MohammadJavad PourhosseiniAsl Shuxiang Dong School of Materials Science and Engineering Peking UniversityBeijing 100871China College of Mechatronics and Control Engineering and Institute for Advanced StudyShenzhen UniversityShenzhen 518051China

Conventionally,to produce a linear motion,one motor’s stator is employed to drive one runner moving forward or *** far,there is almost no report of one electromechanical motor or piezoelectric ultrasonic motor that can directly generate two symmetrical linear motions,while this function is desired for precise scissoring and grasping in the minimally invasive surgery ***,we report a brandnew symmetric-actuating linear piezoceramic ultrasonic motor capable of generating symmetrical linear motions of two outputs directly without additional mechanical transmission *** key component of the motor is an(2×3)arrayed piezoceramic bar stator operating in the coupled resonant mode of the first longitudinal(L_(1))and third bending(B_(3))modes,leading to symmetric elliptical vibration trajectories at its two ends.A pair of microsurgical scissors is used as the end-effector,demonstrating a very promising future for high-precision microsurgical operations.

关键词： field symmetric backward

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A vector hybrid triboelectric sensor(HTS)for motion identification via machine learning

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Nano Research 2023年第7期16卷 10120-10130页

作者： Nannan Zhou Hongrui Ao Xiaoming Chen Shan Gao Hongyuan Jiang School of Mechatronics Engineering Harbin Institute of TechnologyHarbin 150001China School of Control Engineering Northeastern University at QinhuangdaoQinhuangdao 066004China

Rapidly responding and cost-effective sensors played a crucial role in industrial ***,the lack of versatile strategies for identifying and classifying operating states on various practical behaviors has limited the rapid development of monitoring *** study developed a vector hybrid triboelectric sensor(HTS)with surface nanocrystalline containing triboelectric vibration and rotation units(triboelectric vibration unit(TVU),triboelectric rotation unit(TRU))capable of detecting the vibrational and rotary states of the *** synchronous detection of two sensing signals can be achieved due to the hierarchical structure as the basic unit of the HTS,which contributed to reducing the volume and spatial distribution of the *** on the voltage/current/charge(U-I-Q)signal amplitudes and phase features generated by the TVU,the vibration frequency and orientation of the device can be identified by using a double-layer neural network(D-LNN),in which the accuracy reaches 96.5%and 95.5%***,by combining logistic regression,D-LNN,and linear regression,the accuracy of the TRU for rotary classification exceeds 93.5%in practical *** this study,the great potential application of the HTS combined with the machine learning methods was successfully explored and exhibited and it might speed up the development of industrial detection in the near future.

关键词： vector triboelectric sensor surface nanocrystalline hierarchical structure sensing properties state detection machine learning

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Novel 3D grid porous Li_(4)Ti_(5)O_(12) thick electrodes fabricated by 3D printing for high performance lithium-ion batteries

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Journal of Advanced Ceramics 2022年第2期11卷 295-307页

作者： Changyong LIU Yin QIU Yanliang LIU Kun XU Ning ZHAO Changshi LAO Jun SHEN Zhangwei CHEN Additive Manufacturing Institute College of Mechatronics&Control EngineeringShenzhen UniversityShenzhen 518060China Guangdong Key Laboratory of Electromagnetic Control and Intelligent Robots College of Mechatronics&Control EngineeringShenzhen UniversityShenzhen 518060China

Three-dimensional(3D)grid porous electrodes introduce vertically aligned pores as a convenient path for the transport of lithium-ions(Li-ions),thereby reducing the total transport distance of Li-ions and improving the reaction *** there have been other studies focusing on 3D electrodes fabricated by 3D printing,there still exists a gap between electrode design and their electrochemical *** this study,we try to bridge this gap through a comprehensive investigation on the effects of various electrode parameters including the electrode porosity,active material particle diameter,electrode electronic conductivity,electrode thickness,line width,and pore size on the electrochemical *** numerical simulations and experimental investigations are conducted to systematically examine these effects.3D grid porous Li_(4)Ti_(5)O_(12)(LTO)thick electrodes are fabricated by low temperature direct writing technology and the electrodes with the thickness of 1085μm and areal mass loading of 39.44 mg·cm^(−2) are *** electrodes display impressive electrochemical performance with the areal capacity of 5.88 mAh·cm^(−2)@1.0 C,areal energy density of 28.95 J·cm^(−2)@1.0 C,and areal power density of 8.04 mW·cm^(−2)@1.0 *** study can provide design guidelines for obtaining 3D grid porous electrodes with superior electrochemical performance.

关键词： three-dimensional(3D)porous thick electrodes Li_(4)Ti_(5)O_(12)(LTO) 3D printing lithium-ion(Li-ion)battery

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A promising application of bulk metallic glasses in torque sensor

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Science China(Technological Sciences) 2024年第8期67卷 2505-2514页

作者： LU WenHao MA Jiang WANG Chao LIU YanHui Institute of Physics Chinese Academy of SciencesBeijing 100190China Shenzhen Key Laboratory of High Performance Nontraditional Manufacturing College of Mechatronics and Control EngineeringShenzhen UniversityShenzhen 518060China

Torque sensors are essential components of robotic joints. In the past, structure optimization of force-sensing elements has been the common approach to improve the performance of the torque sensors. In this work, we demonstrate a torque sensor with bulk metallic glasses as a force-sensing element. Compared with the sensors made of stainless steel and aluminum alloy, the use of bulk metallic glass as a force-sensing element significantly improves sensor sensitivity, linearity, repeatability, hysteresis, and measuring range. Our work not only opens up a new avenue for the application of bulk metallic glasses, but also provides opportunities for enhancing the performance of force/torque sensors through materials optimization.

关键词： bulk metallic glasses amorphous alloys force sensors

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Kinematic Coupling Planning Method for Position and Attitude of Manipulator

Kinematic Coupling Planning Method for Position and Attitude...

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2024 IEEE International Conference on Robotics and Biomimetics, ROBIO 2024

作者： Chen, Ting Jia, Longfei Hu, Xiaobin Guo, Yajing Wu, Fei Wang, Qing Innovation Center for Control Actuators Beijing Institute of Precision Mechatronics and Controls Beijing China

ISBN: (纸本)9781665481090

In this paper, we introduce a novel coupling motion planning method that addresses the end position and orientation of a manipulator. Through the central point mapping algorithm, the distance from the end effector to the central point is proportionally mapped to the end effector's orientation, thereby determining the manipulator's end position and attitude through normalization. This approach enhances the flexibility and precision of multi-degree-of-freedom manipulators by examining the coupling dynamics inherent in their structural design. Specifically, this study delineates two constraint methods: fixed attitude and attitude variation with position. The efficacy of this method is confirmed through simulation experiments. The outcomes demonstrate that, with optimal selection of proportional parameters, the manipulator's joint deflection angles are minimized, and motion control is optimized. Furthermore, the simulations illustrate the motion traj ectory and dynamic behavior of the manipulator's end effector under various parameter settings, offering valuable insights for the manipulator's design and control strategy development. © 2024 IEEE.

关键词： Degrees of freedom (mechanics)

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Servo system Cascade Linear Active Disturbance Rejection control Based on Motor Models 4

Servo system Cascade Linear Active Disturbance Rejection Con...

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4th International Conference on Industrial Automation, Robotics and control Engineering, IARCE 2024

作者： He, Yuang Zheng, Qijia Liu, Jialun Wang, Yan Fan, Qian Beijing Institute of Precision Mechatronics and Controls Innovation Center for Control Actuators Beijing China

ISBN: (纸本)9798350380323

The electromechanical servo system is usually implemented by three closed loops, with the inner loop being the current loop, the middle loop being the speed loop, and the outer loop being the position loop. The traditional system tuning method is the PI parameter trial and error method, which cannot achieve the optimal performance of the system. This article innovatively adopts the LADRC three closed-loop cascade control method. Compared with previous control methods, the control method applied in this article can ensure that the current loop, speed loop, and position loop control circuits all meet the requirements of the Bode theorem, which provides a basis for the control objectives. This article provides a detailed description of the selection methods for the control order, observer bandwidth, controller bandwidth, and loop gain of each control loop. This method was validated and ultimately achieved stable control of the electromechanical servo system. © 2024 IEEE.

关键词： Disturbance rejection

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EAT: epipolar-aware Transformer for low-light light field enhancement

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Multimedia Tools and Applications 2025年第12期84卷 10609-10630页

作者： Wang, Xingzheng Huang, Wenhao Chen, Kaiqiang Wang, Zixuan Deng, Yuanlong College of Mechatronics and Control Engineering Shenzhen University Yuehai Street Guangdong Shenzhen518060 China Shenzhen Institute of Technology Jiangjunmao Road Guangdong Shenzhen518116 China

Current low-light light field (LF) enhancement methods are mainly based on the convolutional neural network and have achieved considerable effect. However, these methods only consider neighboring views or local epipolar plane images (EPIs), which neglect the rich epipolar geometry among all views and fail to restore more texture details. In this paper, we deliberate the epipolar geometry and take effective utilization of epipolar geometry as a principle to design an epipolar-aware Transformer (EAT). On the one hand, we develop a global epipolar geometry (GEG) structure by processing all views in different epipolar directions respectively to efficiently extract epipolar geometry. On the other hand, in order to exploit epipolar geometry further, we propose an attention-based view selection strategy employing the Transformer to generate attention maps across views and focus on more significant views in the corresponding directions. Specially, EAT consists of two stages: in Stage-I, all views are processed based on GEG structure and selectively fused into the global representation. And in Stage-II, the global information is fine-tuned to self-adaptively enhance each view based on their different angular positions. Experimental results on three publicly available LF datasets show that the proposed method outdoes the state-of-the-art methods by 0.797 dB in average PSNR gain. © The Author(s), under exclusive licence to Springer Science+Business Media, LLC, part of Springer Nature 2024.

关键词： Textures

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The Impact of Emotion on Takeover Performance in Human-machine Shared Driving 13

The Impact of Emotion on Takeover Performance in Human-machi...

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13th International Conference on Transportation and Traffic Engineering, ICTTE 2024

作者： Jiayuan, Wang Tingru, Zhang Institute of Human Factors and Ergonomics College of Mechatronics and Control Engineering Shenzhen University Shenzhen China

ISBN: (数字)9781837242931

ISBN: (纸本)9781837242672

This study aimed to explore the performance differences of different emotions on driver takeover performance in L3 automated driving systems. 48 driving-experienced college students were recruited. Based on the two-dimensional emotion model, four emotions of valence (positive/negative) x arousal (high/low) were selected for induction and verification. Driving behavior data was collected in a simulated driving environment. Driving tasks included 4 obstacle avoidance scenarios. Results show that valence approximately affects takeover time and significantly affects vehicle longitudinal control. Negative emotions led to longer takeover times and sad led to worse longitudinal vehicle control. Arousal had a greater impact on lateral performance. Under high-arousal emotions, drivers have more unstable steering wheel control. This study is of great significance for optimizing automated driving system design and improving driving safety and driver experience. © The Institution of Engineering & Technology 2024.

关键词： Human engineering

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