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Gradient piezoelectric composites for ultrasonic transducer design and imaging applications

Journal of Materiomics 2025年第6期11卷

作者： Chenxue Hou Zhaoxi Li Chunlong Fei Qibo Lin Xiaofei Luo Xiongwei Wei Yiheng Yang Qi Lu Yi Quan Guangzhi Dong Zeyu Chen Xiaozhou Lü Weimin Bao Yintang Yang Shaanxi Provincial Key Laboratory of Integrated Circuit and System Integration Faculty of Integrated Circuit Xidian University Xi'an 710071 China The State Key Laboratory of Analog and Mixed-Signal VLSl Institute of Microelectronics University of Macau Macao 999078 China School of Aerospace Science and Technology Xidian University Xi'an 710071 China State Key Laboratory of Precision Manufacturing for Extreme Service Performance College of Mechanical and Electrical Engineering Central South University Changsha 410083 China College of Automotive and Mechanical Engineering Changsha University of Science and Technology Changsha 410114 China Hunan Province University Key Laboratory of Intelligent Testing and Control Technology for Engineering Equipment Changsha 410114 China School of Advanced Materials and Nanotechnology Xidian University Xi'an 710126 China Furong Laboratory (Precision Medicine) Changsha 410008 China National Engineering Research Center of Personalized Diagnostic and Therapeutic Technology Xiangya Hospital Central South University Changsha 410008 China Hunan Engineering Research Center of Skin Health and Disease Xiangya Hospital Central South University Changsha 410008 China

Ultrasonic imaging technology has advanced rapidly, the escalating demand for imaging quality has driven the continuous development of ultrasonic transducers featuring high-performance. Among them, the crucial factors constraining the further enhancement of imaging quality are the frequency of the device and the intensity of the echo signal. Piezoelectric composites have become a hotspot for ultrasonic transducers and imaging applications due to their excellent properties. However, due to the limitations of the accuracy of the cutting process, the development of piezoelectric/polymer composites is often undermined by undesirable pseudo-vibrations, especially in high-frequency applications, which will significantly reduce energy conversion efficiency. In this study, a novel design method of 1–3 piezoelectric composites with gradient nanoparticle doped polymer is proposed to eliminate the undesired lateral vibrations. Based on the optimized composites, a high-performance composite ultrasonic transducer with a center frequency of 8.51 MHz is prepared. Compared with the traditional composite transducer, the optimized transducer improves the echo voltage amplitude significantly, reaching nearly 3 times. The above advantages are further verified in high-quality ultrasound and photoacoustic imaging. The optimization method has valuable guidance for the design of high-frequency composite transducers, which have great potential in ultrasonic and photoacoustic imaging applications.

关键词： Piezoelectric composites Ultrasonic transducer Imaging applications Lateral vibration Finite element analysis

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Coordinate Control,Motion Optimization and Sea Experiment of a Fleet of Petrel-Ⅱ Gliders

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Chinese Journal of Mechanical Engineering 2018年第1期31卷 127-141页

作者： Dong-Yang Xue Zhi-Liang Wu Yan-Hui Wang Shu-Xin Wang Key Laboratory of Mechanism Theory and Equipment Design of Ministry of Education Tianjin University School of Mechanical Engineering Tianjin University The Joint Laboratory of Ocean Observing and Detecting Qingdao National Laboratory for Marine Science and Technology

The formation of hybrid underwater gliders has advantages in sustained ocean observation with high resolution and more adaptation for complicated ocean tasks. However, the current work mostly focused on the traditional gliders and *** research on control strategy and energy consumption minimization for the hybrid gliders is necessary both in methodology and experiment. A multi-layer coordinate control strategy is developed for the fleet of hybrid underwater gliders to control the gliders’ motion and formation geometry with optimized energy consumption. The inner layer integrated in the onboard controller and the outer layer integrated in the ground control center or the deck controller are designed. A coordinate control model is proposed based on multibody theory through adoption of artificial potential fields. Considering the existence of ocean flow, a hybrid motion energy consumption model is constructed and an optimization method is designed to obtain the heading angle, net buoyancy, gliding angle and the rotate speed of screw propeller to minimize the motion energy with consideration of the ocean flow. The feasibility of the coordinate control system and motion optimization method has been verified both by simulation and sea trials. Simulation results show the regularity of energy consumption with the control variables. The fleet of three Petrel-Ⅱ gliders developed by Tianjin University is deployed in the South China Sea. The trajectory error of each glider is less than 2.5 km, the formation shape error between each glider is less than 2 km, and the difference between actual energy consumption and the simulated energy consumption is less than 24% actual energy. The results of simulation and the sea trial prove the feasibility of the proposed coordinate control strategy and energy optimization method. In conclusion, a coordinate control system and a motion optimization method is studied, which can be used for reference in theoretical research and practical f

关键词： Underwater glider Petrel-Ⅱ Coordinate control Path planning Artificial potential fields(APFs) Energy consumption

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Modulation of stem cells from apical papilla using direct current electric fields: A pathway toward translational dentin regeneration

Translational Dental Research

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Translational Dental Research 2025年第2期1卷

作者： Xiaolin Li Yu Gu Jingyi Li Yan Wang Qian Liu Lihong Qiu Alastair J. Sloan Fa-Ming Chen Xu Chen Bing Song Department of Endodontics School and Hospital of Stomatology Liaoning Provincial Key Laboratory of Oral Diseases China Medical University Shenyang 110002 China School of Biomedical Engineering Shenzhen University of Advanced Technology Shenzhen Guangdong 518107 China Morrello Clinic Neuro Rehabilitation and Neuro Physiotherapy Newport NP18 2LH UK Center for Translational Medicine Research and Development Institute of Biomedical and Health Engineering Shenzhen Institutes of Advanced Technology Chinese Academy of Sciences Shenzhen Guangdong 518055 China Department of Dermatology The First Hospital of China Medical University National Health Commission Key Laboratory of Immunodermatology Key Laboratory of Immunodermatology of Ministry of Education Shenyang 110001 China Melbourne Dental School Faculty of Medicine Dentistry and Health Sciences University of Melbourne Melbourne VIC 3035 Australia Department of Pediatric Dentistry School and Hospital of Stomatology Liaoning Provincial Key Laboratory of Oral Diseases China Medical University Shenyang 110002 China State Key Laboratory of Oral & Maxillofacial Reconstruction and Regeneration National Clinical Research Center for Oral Diseases Shaanxi International Joint Research Center for Oral Diseases Department of Periodontology School of Stomatology The Fourth Military Medical University Xi'an 710032 China Key Laboratory of Biomedical Imaging Science and System Chinese Academy of Sciences and State Key Laboratory of Biomedical Imaging Science and System Shenzhen Guangdong 518055 China

Dentin is produced by odontoblasts, which originate from mesenchymal cells in the dental papilla. Although numerous studies have explored the molecular switches involved in the differentiation of stem cells from apical papilla (SCAP), little is known about the involvement of electric signals in this process. Recent advances indicate that injured dentin generates an electric current. Therefore, it is essential to evaluate whether the extracellular electrical environment surrounding SCAP in the damaged root can promote tissue repair and regeneration. This study aims to investigate the regulatory effects of direct current electric fields (DCEFs) on SCAP, with the potential to contribute to innovative strategies for tooth regeneration. These strategies include the construction of in vitro models for mechanistic studies, the design of piezoelectric hydrogels for pulp regeneration, the development of novel dental pharmaceuticals, and the development of new clinical treatment techniques.

关键词： Direct current electric fields Stem cells from apical papilla Migration Proliferation Cell differentiation Electric microenvironment

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Corrigendum to “A comprehensive multi-parameter optimization method of squeeze film damper-rotor system using hunter-prey optimization algorithm” [Tribol Int 194 (2024)109538]

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Tribology International 2024年 195卷

作者： Yufei Xu Hongrui Cao Jianghai Shi Shiyuan Pei Bo Zhang Kailang She School of Mechanical Engineering Xi’an Jiaotong University Xi’an 710049 PR China National and Local Joint Engineering Research Center of Equipment Operation Safety and Intelligent Monitoring Xi’an Jiaotong University Xi’an 710049 PR China Key Laboratory of Education Ministry for Modern Design and Rotor-Bearing System Xi’an Jiaotong University Xi’an 710049 PR China Department of Mechanics and Aerospace Engineering Southern University of Science and Technology Shenzhen 518055 PR China

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Finite Element Analysis of Series Elastic Actuator for Exoskeleton Robot Joint

Finite Element Analysis of Series Elastic Actuator for Exosk...

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IEEE International Conference on Mechatronics and Automation

作者： Pengyu Xi Weimin Ge Sen Zhang Zhili Zhang Teresa Zielinska Tianjin Key Laboratory for Advanced Mechatronic System Design and Intelligent Control School of Mechanical Engineering Tianjin University of Technology Tianjin China National Demonstration Center for Experimental Mechanical and Electrical Engineering Education Tianjin University of Technology Intelligent Manufacturing College Tianjin Sino-German University of Applied Science Tianjin China Institute of Aeronautics and Applied Mechanics Warsaw University of Technology Warsaw Poland

ISBN: (数字)9781728164168

ISBN: (纸本)9781728164175

The finite element simulation for the joints of an exoskeleton robot is conducted in this paper. Using software OpenSim to simulate the normal walking gait of the human body, the motion angle and moment of the human hip, knee and ankle joints are obtained. Using the obtained data as the input parameters in the finite element simulation of the simulation software Ls-dyna, the strain diagrams and contact force curves of the circular roller and cam disk were obtained. In this study, three commonly used materials are selected: alloy steel, ductile iron and hard aluminum alloy. Finally, the effects of different materials on the key components of the series elastic actuator are studied.

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design of Wide Interval Frequency Hopping Pattern for Frequency Hopping Mobile Ad-hoc Networks

Design of Wide Interval Frequency Hopping Pattern for Freque...

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作者： Yadong Zhao Yu Zhang Jian Song Beijing National Research Center for Information Science and Technology(BNRist) Department of Electronic Engineering Tsinghua University Key Laboratory of Digital TV System of Guangdong Province and Shenzhen City Research Institute of Tsinghua University in Shenzhen

The frequency hopping mobile ad-hoc network(FH MANET) is a communication network that combines frequency hopping(FH) technology and mobile ad-hoc network(MANET) *** technology can improve the anti-interference performance of the network,and MANET technology improves the mobility and anti-destructiveness of the *** can be networked autonomously without manual intervention and other network *** has strong application value in complex battlefield environment and occasions with harsh environment and high confidentiality *** frequency hopping pattern(FHP) design is a key technology in the FH MANET,which is directly related to the network's anti-interference and multipath fading *** this paper,a wide interval expansion method(WIEBM) based on m-sequence and non-continuous tap L-G model is *** experimental results demonstrate that proposed scheme can effectively improve the antiinterference ability of the *** has the ability to resist more than 30% of broadband interference.

关键词： MANET design of Wide Interval Frequency Hopping Pattern for Frequency Hopping Mobile Ad-hoc Networks Mobile

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Agent-based MR Simulation as a Tool for Combat Search and Rescue Command and Control

Agent-based MR Simulation as a Tool for Combat Search and Re...

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作者： Xiang Ji Hu Liu Zizhao Wang Yuge Li Yongliang Tian Mingyu Huo School of Aeronautical Science &Engineering Beihang University State Key Laboratory of Virtual Reality Technology and System Aircraft Advanced Design Technology Key Laboratory of Ministry of Industry

Combat search and rescue（CSAR） is a significant part of joint combat operation. The isolated personnel in hostile territory is of great value to both sides. For the sake of extremely high cost and massive consumption of time in military exercises, virtual reality is a preferred way to conduct the experiment. Mixed reality, known as MR, allows users to interact with the virtual objects, as well as the real objects. With MR devices, commanders get a better awareness of both virtual combat and real environment. Agent-based modelling is a relatively new approach to modelling systems composed of interacting objects. By analyzing the decision-making process of agents, codes are written to drive the simulation. Finally, the whole system is applied to HoloLens to provide a holographic demonstration.

关键词： Combat search and rescue Mixed reality Agent-based modelling Kosovo war Finite-state machine

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A DTW based automatic transient identification method in nuclear power plants

A DTW based automatic transient identification method in nuc...

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2018 Transactions of the American Nuclear Society, ANS 2018 and Embedded Topical Meeting Nuclear Fuels and Structural Materials

作者： Bai, Xiaoming Ai, Honglei Wang, Xinjun Science and Technology on Reactor System Design Technology Laboratory Nuclear Power Institute of China No.328 Changshu Avenue Chengdu610213 China

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A DTW based automatic transient identification method in nuclear power plants

A DTW based automatic transient identification method in nuc...

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AISTech 2018 Iron and Steel technology Conference and Exposition

作者： Bai, Xiaoming Ai, Honglei Wang, Xinjun Science and Technology on Reactor System Design Technology Laboratory Nuclear Power Institute of China No.328 Changshu Avenue Chengdu610213 China

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A Metamaterial Inspired Button Antenna for Wireless Power and Data Transfer

A Metamaterial Inspired Button Antenna for Wireless Power an...

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IEEE International Conference on Electronic Information and Communication technology (ICEICT)

作者： Jiahao Zhang Jin Meng Wei Li Sen Yan Guy A. E. Vandenbosch National Key Laboratory of Science Technology on Vessel Integrated Power System Wuhan China Faculty of Electronics and Information Xi'an Jiaotong University Xi'an China ESAT-TELEMIC Research Division KU Leuven Leuven Belgium

ISBN: (数字)9781728190457

ISBN: (纸本)9781728190464

A novel metamaterial inspired button antenna topology is proposed, integrating two working modes to transfer power and data, respectively. An omni-directional radiation is obtained in the 3.5 GHz WiMAX band to support on-body communication, while a circular polarized broadside radiation is achieved in the 5 GHz WLAN band to harvest power. An Artificial Magnetic Conductor (AMC) metamaterial structure is used to achieve a low-profile design. A wide bandwidth and high efficiency are observed. All these features make the proposed antenna suitable for on-body data transmission and off-body energy harvesting. A prototype has been fabricated. The measurement results are in good agreement with the simulation results.

关键词： Wireless LAN Wireless power transfer Data transfer Conductors Metamaterials Magnetic materials Wideband

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