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Light field angular super resolution based on residual channel attention and classification up-sampling

Multimedia Tools and Applications 2025年第12期84卷 10945-10967页

作者： Wang, Xingzheng Wang, Zixuan You, Senlin College of Mechatronics and Control Engineering Shenzhen University Nanhai Avenue Guangdong Province Shenzhen518060 China

Current light field angular super resolution algorithms generate coarse viewpoint images due to their low learning ability and equally upsample all macropixels on the light field image. In this paper, we propose a novel angular super resolution network to precisely enhance angular resolution, via stacking multiple residual channel attention groups and accurately up-sampling macro pixels with a classified prediction module. Firstly, the network extracts low-frequency angular information on the input light field image, and then refines high-frequency angular information by stacking residual channel attention groups. Secondly, the classified prediction module combines high-frequency and low-frequency angular information to predict three groups of feature maps with three channels. The first two channels of each group predict two different angular information from macro pixels. The third channel learns classification results and ensures up-sampling bases on the most accurate information. According to classified results, we could accurately speculate occlusions, and obtain three high-quality images with the same angular resolution as the input image. Finally, to enhance the angular resolution, we integrate three high-quality images with the input image into one light field image. The experimental results verify the effectiveness of our proposed method, we achieve average PSNR gains of 2.81 dB than the state-of-the-art method. © The Author(s), under exclusive licence to Springer Science+Business Media, LLC, part of Springer Nature 2024.

关键词： Forecasting

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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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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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Review on the Fabrication of Surface Functional Structures for Enhancing Bioactivity of Titanium and Titanium Alloy Implants

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Chinese Journal of Mechanical engineering 2024年第4期37卷 23-49页

作者： Heng Tang Jiaxiang Xu Bin Guo Yansong Xie Yalong Sun Yanjun Lu Yong Tang Guangdong Provincial Key Laboratory of Micro/Nano Optomechatronics Engineering College of Mechatronics and Control EngineeringShenzhen UniversityShenzhen 518000China School of Mechanical and Power Engineering Zhengzhou UniversityZhengzhou 450001China

Titanium and its alloys have been widely applied in many biomedical fields because of its excellent mechanical properties,corrosion resistance and good ***,problems such as rejection,shedding and infection will occur after titanium alloy implantation due to the low biological activity of titanium alloy *** structures with specific functions,which can enhance osseointegration and antibacterial properties,are fabricated on the surface of titanium implants to improve the biological activity between the titanium implants and human *** paper presents a comprehensive review of recent developments and applications of surface functional structure in titanium and titanium alloy *** applications of surface functional structure on different titanium and titanium alloy implants are introduced,and their manufacturing technologies are summarized and ***,the fabrication of various surface functional structures used for titanium and titanium alloy implants is reviewed and analyzed in ***,the challenges affecting the development of surface functional structures applied in titanium and titanium alloy implants are outlined,and recommendations for future research are presented.

关键词： Surface functional structure Titanium implant Manufacturing technology Bioactivity

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Design of T-type CM EMI Filter Based on Planar Electromagnetic Integration 2

Design of T-type CM EMI Filter Based on Planar Electromagnet...

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2nd China Power Supply Society Electromagnetic Compatibility Conference, CPEMC 2024

作者： Zhang, Xudong Sun, Zixiu Liu, Yitao College of Mechatronics and Control Engineering Shenzhen University Shenzhen China

ISBN: (纸本)9798331509552

—The application of high-frequency switching components has made the switching frequency of the inverter develop towards higher frequency, which also brings serious electromagnetic interference (EMI) problems. The LCL filter has good low frequency filtering effect. The symmetrical LCL filter can improve the EMI suppression effect while ensuring the harmonic suppression effect. However, the common mode (CM) noise cannot be suppressed below the standard line, so further design of the CM EMI filter is required. The insertion loss of a single-stage CM EMI filter is 40dB/dec, and the insertion loss of a double-stage CM EMI filter can be increased to 80dB/dec. However, the double-stage CM EMI filter uses more CM capacitors, which will lead to an increase in leakage current. Based on this, a T-type CM EMI filter is proposed, which uses two CM inductors and two CM capacitors. The insertion loss can be increased to 60 dB/dec without increasing the number of capacitors used, and planar electromagnetic integration design is carried out for T-type CM EMI filter to reduce size and weight. By building an inverter experimental platform based on GaN, the filtering effect of the designed filter is verified. ©2024 IEEE.

关键词： Gallium nitride

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Design of Symmetrical Magnetic Integrated Filter with Balanced Flux Paths for the Grid-Connected Inverter 7

Design of Symmetrical Magnetic Integrated Filter with Balanc...

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7th IEEE International Electrical and Energy Conference, CIEEC 2024

作者： Chen, Hongle Liu, Yitao Wu, Xionghui College of Mechatronics and Control Engineering Shenzhen University Shenzhen China

ISBN: (纸本)9798350359558

Magnetic components such as inductors constitute a major proportion of the overall size and volume of grid-connected inverters. This paper presents an exploratory investigation into the magnetic integration of a three-phase LCL filter induction system, employing a Y-configured core that achieves equal magnetic flux pathways. Compared to using a conventional rectangular core, the proposed Y -shaped core configuration demonstrates a volumetric reduction of over 10% for the three-phase inductors, while preserving the integrity of LCL filter functionality. The magnetic circuit analysis of the Y -shaped core is complemented by three-dimensional Finite Element Analysis (FEA) simulations to validate the theoretical calculations and reduced volumetric size. By enhancing the symmetry of magnetic flux distribution, this integrated inductor design significantly contributes to the miniaturization of three-phase grid-connected inverters without compromising their filtering performance. © 2024 IEEE.

关键词： Magnetic flux

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Electromagnetic Integrated Design of EMI Filters based on Flexible Multilayer Foils 2

Electromagnetic Integrated Design of EMI Filters based on Fl...

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2nd China Power Supply Society Electromagnetic Compatibility Conference, CPEMC 2024

作者： Liu, Ziyi Liu, Xingyu Liu, Yitao College of Mechatronics and Control Engineering Shenzhen University Shenzhen China

ISBN: (纸本)9798331509552

—The electromagnetic interference (EMI) filters with high power density and miniaturization is widely used in the design of grid-connected inverters to solve the EMI problem. While in the era of high-integrated and high-frequency power electronic technology, the improved design of EMI filters has become an important topic, which aims to achieve the lightweight and miniaturization of filters. Therefore, in order to process conducted EMI, the electromagnetic integrated design of EMI filters based on flexible multilayer foils (FMLFs) is proposed in this study. Compared with traditional integrated EMI filters, electromagnetic integrated EMI filters based on FMLFs perform better. Besides, their noise suppression effect is comparable to that of discrete filters. In addition, they also have advantages in terms of volume, weight and efficiency. Finally, experiments have been conducted on a single-phase SiC inverter to verify the effectiveness of the proposed model. ©2024 IEEE.

关键词： Interference suppression

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Recurrent Neural Network-Based Model Predictive control for Speed Regulation in Permanent Magnet Synchronous Motors with an Extended Sliding Mode Load Torque Observer 7

Recurrent Neural Network-Based Model Predictive Control for ...

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7th IEEE International Electrical and Energy Conference, CIEEC 2024

作者： Wu, Xionghui Liu, Yitao Chen, Hongle College of Mechatronics and Control Engineering Shenzhen University Shenzhen China

ISBN: (纸本)9798350359558

In the pursuit of enhancing control efficiency in Permanent Magnet Synchronous Motor (PMSM) servo systems, this paper integrates a Model Predictive control Speed control (MPSC) approach into the speed loop control architecture. The predominant challenge in conventional MPC is its extensive computational demand, which also becomes significantly susceptible to load disturbances. To mitigate this, the paper introduces a discrete recurrent neural network (RNN) specifically aimed at reducing the computational burden associated with MPC. Additionally, an extended sliding mode load torque observer (ESMLTO) is developed for the PMSM drive system, focusing on mitigating load torque effects and bolstering overall system robustness. The viability and performance enhancement brought about by these proposed strategies are substantiated through a series of simulations and experimental validations. © 2024 IEEE.

关键词： Speed control

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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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