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Oxidation-induced superelasticity in metallic glass nanotubes

Nature Materials 2024年第1期23卷 52-57页

作者： Li, Fucheng Zhang, Zhibo Liu, Huanrong Zhu, Wenqing Wang, Tianyu Park, Minhyuk Zhang, Jingyang Bönninghoff, Niklas Feng, Xiaobin Zhang, Hongti Luan, Junhua Wang, Jianguo Liu, Xiaodi Chang, Tinghao Chu, Jinn P. Lu, Yang Liu, Yanhui Guan, Pengfei Yang, Yong Department of Mechanical Engineering College of Engineering City University of Hong Kong Kowloon Tong Hong Kong Institute of Physics Chinese Academy of Sciences Beijing China Songshan Lake Materials Laboratory Dongguan China Beijing Computational Science Research Center Beijing China Department of Material Science and Engineering National Taiwan University of Science and Technology Taipei Taiwan Department of Materials Science and Engineering College of Engineering City University of Hong Kong Kowloon Tong Hong Kong College of Mechatronics and Control Engineering Shenzhen University Shenzhen China Department of Mechanical Engineering The University of Hong Kong Pok Fu Lam Hong Kong Department of System Engineering College of Engineering City University of Hong Kong Kowloon Tong Hong Kong

Although metallic nanostructures have been attracting tremendous research interest in nanoscience and nanotechnologies, it is known that environmental attacks, such as surface oxidation, can easily initiate cracking on the surface of metals, thus deteriorating their overall functional/structural properties 1–3. In sharp contrast, here we report that severely oxidized metallic glass nanotubes can attain an ultrahigh recoverable elastic strain of up to ~14% at room temperature, which outperform bulk metallic glasses, metallic glass nanowires and many other superelastic metals hitherto reported. Through in situ experiments and atomistic simulations, we reveal that the physical mechanisms underpinning the observed superelasticity can be attributed to the formation of a percolating oxide network in metallic glass nanotubes, which not only restricts atomic-scale plastic events during loading but also leads to the recovery of elastic rigidity on unloading. Our discovery implies that oxidation in low-dimensional metallic glasses can result in unique properties for applications in nanodevices. © 2023, The Author(s), under exclusive licence to Springer Nature Limited.

关键词： Metallic glass

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A Study on Optimal Path Analysis Considering the Production of Offshore Plant Blocks 6

A Study on Optimal Path Analysis Considering the Production ...

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6th International Conference on Control and Robotics, ICCR 2024

作者： Kang, Haneul Kim, Sungkyu Shin, Juyoung Hyun, Janghwan KHAN PLANT Co. Ltd Department of Energy and Mechanical Engineering Geoje Korea Republic of KHAN PLANT Co. Ltd Department of Mechatronics Geoje Korea Republic of KHAN PLANT Co. Ltd Department of Marine Engineering System Geoje Korea Republic of KHAN PLANT Co. Ltd Department of Mechanical Engineering Geoje Korea Republic of

ISBN: (纸本)9798331518158

In the shipbuilding and offshore plant industries, determining efficient transportation routes for large blocks is crucial. This study aims to optimize transportation routes for large blocks using transporters to ensure efficient route planning. To achieve this, Dijkstra's algorithm was used to determine not only the shortest distance but also to comprehensively consider factors such as the size and weight of each block, as well as road and bridge information along the route to derive the optimal route. The proposed algorithm was validated by comparing it with actual transportation routes, and its effectiveness was confirmed with a low error rate. This study contributes to enhancing the efficiency of large block transportation, minimizes economic losses, and provides foundational data for future optimization research on similar problems. © 2024 IEEE.

关键词： Offshore power plants

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Analysis of Mechanical Properties of a Quick Locking Structure Based on Simulation and Experiment

Analysis of Mechanical Properties of a Quick Locking Structu...

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Mechanical engineering and Power engineering (MEPE), International Conference on

作者： Lin Yu Yi Qin Jianbin Feng Yuxi Zhang Xi Sheng Jianxin Qiao Beijing Institute of Astronautical System Engineering Beijing China Harbin Institute of Technology School of Mechatronics Engineering Harbin China

ISBN: (数字)9798350359459

ISBN: (纸本)9798350359466

With the continuous development of modular technology in the aerospace field, many repeated locking technologies are required to achieve multiple locking and separation of separate parts and other parts on spacecraft. To ensure the rapid disassembly, debugging, and efficient transportation of the rocket inertial platform. This paper proposes a rotary fast locking mechanism, which has a simple structure and is easy to operate. On this basis, the evaluation index of its mechanical environment adaptability is constructed, and the structure is analyzed using finite element simulation combined with experimental testing. The structure shows that the structure could be used in key fields such as aerospace.

关键词： Space vehicles Rockets Power engineering Transportation Debugging Mechanical factors Finite element analysis

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A Multi-mode Low Energy Consumption system Control and Reliability Evaluation Method

A Multi-mode Low Energy Consumption System Control and Relia...

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2023 International Conference on Smart Electrical Grid and Renewable Energy, SEGRE 2023

作者： Zhang, Ying Zhao, Yifei Lv, Zhanggang Wang, Shihui Yang, Bo Beijing Institute of Aerospace Automatic Controls System Engineering Research Department Beijing China Beijing Institute of Aerospace Automatic Controls Committee on Science and Technology Beijing China Beijing Institute of Precision Mechatronics and Controls Beijing China

ISBN: (纸本)9798350323269

The multi-mode low energy consumption system control and reliability evaluation method proposed in this paper has the novelty by implementing multi-mode control and operation status monitoring. Man-machine interaction mode switch, and real-time display of the controlled object, program-controlled power supply, can control the internal power supply of each part of the output state, system power consumption, system reliability, the realization of the system under the multi-mode real-time operating state monitoring. The health status of the low energy consumption system can be divided into five states: healthy state, mildly degraded state, moderately degraded state, severely degraded state, and fault state, which characterized the health status of the system operation. By quantifying the health status of low-power multi-mode systems, a fine-grained health assessment of voltage parameters between 21.50 and 23.00 volts is achieved through collecting the observable state quantity of the low energy consumption system, with wavelet packet transformation, and the HMM prediction model. The multi-mode energy consumption control method and reliability estimation strategy proposed in this paper , which has the simulation results with 22.20~22.50 V as normal status and wider 22.05~22.75 V as fault status,have important application significance for reducing system power consumption, evaluating system health status, timely carrying out health maintenance, and extending system service life. © 2023 IEEE.

关键词： Electric power utilization

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Autonomous Museum Tour Guide Robot With Object Detection Using Tensorflow Learning Machine 8

Autonomous Museum Tour Guide Robot With Object Detection Usi...

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8th IEEE Information Technology International Seminar, ITIS 2022

作者： Umam, Faikul Adiputra, Firmansyah Dafid, Ach. Wahyuni, Sri University of Trunojoyo Madura Department of Mechatronics Engineering Bangkalan Indonesia University of Trunojoyo Madura Departement of Information System Bangkalan Indonesia University of Trunojoyo Madura Department of Informatics Engineering Bangkalan Indonesia

ISBN: (纸本)9798350398199

This device focuses on making tools as a substitute for human resources in historical tourism by creating the Autonomous Museum Tour Guide Robot. This robot is made to help tourists in the Museum walk around in a coherent way throughout the museum area and explain comprehensive information and experiences related to the Museum and the existing collections. The tool's implementation is controlled by the deep learning Convolutional Neural Network method using the Tensor flow framework to recognize and classify the detected objects. The robot that will be created is a 3-wheeled robot with one camera as a sensor to detect objects around the robot. The robot is equipped with an audio speaker to provide object detection information. The robot detected six objects at the Sumenep Palace Museum, which were integrated into a robot with a 100% success percentage in the 5th epoch with the 175th iteration. The time required was 117.11 error of 0.393. Weaknesses in this study are the need for control throughout the tour guide robot so that it runs more stable and the use of a camera with a higher resolution, but when run on the system, it does not affect system performance. © 2022 IEEE.

关键词： Robots

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Electromagnetic Design of 12/14 Conical Bearingless Switched Reluctance Motor 6

Electromagnetic Design of 12/14 Conical Bearingless Switched...

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6th IEEE International Electrical and Energy Conference, CIEEC 2023

作者： Xu, Zhenyao Yan, Fushuai Zhang, Fengge Wang, Huijun Lee, Dong-Hee Yi, Tiehang School of Electrical Engineering Shenyang University of Technology Shenyang110870 China School of Instrumentation Science and Opto-Electronics Engineering Beihang University Beijing100191 China Kyungsung University Department of Mechatronics Engineering Busan48434 Korea Republic of Crrc Dalian Institute Heat-Exchange System Division Dalian China

ISBN: (纸本)9798350346671

A novel 12/14 conical bearingless switched reluctance motor is designed for the problem that the torque and suspending force control of conventional BSRM are coupled with each other and cannot control the axial suspending force. First., the structure and principle of the conical bearingless switched reluctance motor are introduced., and the main dimensions of the 12/14 BSRM are calculated with reference to the design method of the conventional SRM. Then the size of the conical motor is determined by increasing the cone angle., etc. on the basis of the 12/14 column BSRM. Three structures based on the large end of the rotor., the small end of the rotor and the middle section of the rotor are proposed to explore the effect of the cone angle on the motor performance with the same excitation current and magnetic saturation., respectively., to determine the final size of the motor from the consideration of the performance and the difficulty of machining. Finally., the effectiveness of the designed motor is verified by analyzing the inductance., torque., suspending force and coupling characteristics of the motor. © 2023 IEEE.

关键词： Reluctance motors

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Svm-based damage detection technique using smart valves in a pipeline system

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Transactions of the Korean Society of Mechanical Engineers, A 2021年第11期45卷 1019-1028页

作者： Park, Jin-Woo Kim, Won Jung, Byung Chang Moon, Seok-Jun Yang, Seok-Jo Dept. of System Dynamics Korea Institute of Machinery and Materials Korea Republic of Dept. of Mechatronics Engineering Chungnam Nat'l Univ Korea Republic of

In various industrial sites, pipeline damages due to external shock, pipeline corrosion, mechanical damage, and consequent severe accidents have been reported. To quickly detect and isolate a damaged pipeline when rupture occurs, we research smart valves with a support vector machine (SVM)-based damage detection algorithm. First, a testbed to validate the developed damage detection algorithm is built, and pressure data in various damage conditions are collected. Second, the main features for damage detection are selected and classifiers are designed based on the SVM. Finally, the designed classifier is installed on the smart valves. The method's effectiveness for autonomous detection and isolation of the damage in the testbed is confirmed. A smart valve with SVM-based damage detection algorithm is expected be helpful in reducing maintenance cost in pipeline systems. © 2021 The Korean Society of Mechanical Engineers.

关键词： Support vector machines

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Enhanced bifunctional water electrolysis performance of spherical ZnMn2O4 nanoparticles

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International Journal of Hydrogen Energy 2025年 141卷 721-728页

作者： Sekar, Sankar Sadhasivam, Sutha Shanmugam, Atsaya Saravanan, S. Pugazhendi, Ilanchezhiyan Lee, Youngmin Kim, Deuk Young Manikandan, Ramalingam Chang, Seung-Cheol Lee, Sejoon Division of System Semiconductor Dongguk University-Seoul Seoul04620 Korea Republic of Quantum-functional Semiconductor Research Center Dongguk University-Seoul Seoul04620 Korea Republic of Department of Chemistry CMS College of Engineering Ernapuram Tamil Nadu Namakkal637003 India Department of Mechanical Engineering K. Ramakrishnan College of Technology Tamil Nadu Trichy621112 India Department of Cogno-Mechatronics Engineering College of Nanoscience and Nanotechnology Pusan National University Busan46241 Korea Republic of Engineering Research Center for Color-Modulated Extra-Sensory Perception Technology Pusan National University Busan46241 Korea Republic of

Spinel-type transition metal oxide-based catalysts are crucial for efficient electrocatalytic oxygen and hydrogen generation. Therefore, in this study, zinc manganite (ZnMn2O4) nanostructures were synthesized using two different reducing agents, including sodium carbonate (Na2CO3) and sodium hydroxide (NaOH), through the coprecipitation method. When ZnMn2O4 was synthesized using NaOH, the sample exhibited a morphology with the aggregated and stacked nanobundles. In contrast, the Na2CO3-derived ZnMn2O4 sample demonstrated an interconnected and agglomerated spherical nanoparticle structure. For the oxygen evolution reaction, the spherical ZnMn2O4 nanoparticles exhibited the exceptional electrocatalytic performances, with an overpotential of 110 mV and a low Tafel slope of 47 mV/dec, showing excellent durability at 10 mA/cm2 in an alkaline electrolyte. For the hydrogen evolution reaction, the spherical ZnMn2O4 nanoparticles indicated a low overpotential of 158 mV and a Tafel slope of 120 mV/dec, with excellent stability at −10 mA/cm2. These findings suggest that the spherical ZnMn2O4 nanoparticles are effective electrocatalysts for highly efficient water-splitting. © 2024 Hydrogen Energy Publications LLC

关键词： Sodium hydroxide

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Dialogue system based on Reinforcement Learning in Smart Home Application 9

Dialogue System based on Reinforcement Learning in Smart Hom...

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9th International Conference on Computer, Control, Informatics and Its Applications: Digital Transformation Towards Sustainable Society for Post Covid-19 Recovery, IC3INA 2022

作者： Fakhrurroja, Hanif Musnansyah, Ahmad Satriakamal, Muhammad Dewan Wardana, Bima Kusuma Putra, Rizal Kusuma Pramesti, Dita Research Center for Smart Mechatronics National Research and Innovation Agency Indonesia School of Industrial and System Engineering Telkom University Indonesia School of Computing Telkom University Indonesia

ISBN: (纸本)9781450397919

This research discusses how to interact with a smart home using speech recognition and a touchscreen to control electronic devices. Google Speech Cloud API use to process speech-to-text and text-to-speech. The system is built in a mobile-based application using a touchscreen as remote control and speech to control the electronic devices. This mobile application is made using the Flutter framework. We use natural language understanding (NLU) in speech processing to determine the intent. The learning process in a dialogue system is based on reinforcement learning. Interaction through the touch screen on the mobile application performs well, while the dialogue system based on reinforcement learning accuracy rate is 83.33%. © 2022 ACM.

关键词： Reinforcement learning

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Dynamics Analysis of a Symmetric 3-R(SRS)RP Multi-loop Mechanism 1

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23rd IFToMM China International Conference on Mechanism and Machine Science and engineering, IFToMM CCMMS 2022

作者： Li, Chuanyang Qin, Zhongbao Hu, Changhua Liu, Rongqiang Liu, Ruiwei Song, Xiaoke PLA Rocket Force University of Engineering Xi’an710025 China State Key Laboratory of Robotics and System Harbin Institute of Technology Harbin150080 China College of Naval Architecture and Ocean Engineering Guangzhou Maritime University GuangZhou510725 China School of Mechatronics and Vehicle Engineering East China Jiaotong University Nanchang330013 China

ISBN: (数字)9789811993985

ISBN: (纸本)9789811993978

The 3-R(SRS)RP multi-loop Mechanism is regarded as one module of a multi-stage manipulator for space manipulation operations, such as capturing free-flying objects. The mechanism has two rotational and one translational degrees of freedom, as well as includes coupled kinematic chains, which can be constructed to the modular system for space operation. The dynamics analysis of the mechanism is the basis of its structural design and actuation control. In this paper, the twist shaping matrix between the twists of links and the input rate array is derived by decoupling the mechanism and motion analysis. Based on the Newton–Euler equation, the dynamics model of the mechanism is established. the theoretical values of actuation power consumption on the certain motion modes is calculated via programming, then being compared with the simulation values obtained through ADAMS model. The results are basically consistent, which verifies the correctness of the dynamics analysis of the mechanical system. © 2023, The Author(s), under exclusive license to Springer Nature Singapore Pte Ltd.

关键词： Dynamics

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