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arXiv 2022年

作者： Zhang, Wang Wang, Hao Tan, Alvin T.L. Ranganath, Anupama Sargur Zhang, Biao Wang, Hongtao Chan, John You En Ruan, Qifeng Liu, Hailong Ha, Son Tung Wang, Dong Ravikumar, Venkat K. Low, Hong Yee Yang, Joel K.W. Engineering Product Development Singapore University of Technology and Design Singapore487372 Singapore Northwestern Polytechnical University 127 West Youyi Road Xi'An710072 China Institute of Materials Research and Engineering Singapore138634 Singapore Robotics Institute State Key Laboratory of Mechanical System and Vibration School of Mechanical Engineering Shanghai Jiao Tong University Shanghai200240 China Advanced Micro Devices Singapore Pte Ltd Singapore Singapore

Reconfigurable metamaterials1-3 require constituent nanostructures to demonstrate switching of shapes with external stimuli. For generality, such nanostructures would touch and stick to other surfaces in one of its configurations. Yet, a longstanding challenge is in overcoming this stiction caused by Van der Waals forces, which impedes shape recovery. Here, we introduce a stiff yet self-recovering material system based on acrylic acid, and tested it in high-aspect ratio structures, where recovery is weak. This designer material has a storage modulus of ~5.2 GPa at room temperature and ~90 MPa in the rubbery state at 150 ℃, an order of magnitude higher than previous reports. A high-resolution resin for two-photon lithography was developed based on this polymer system, enabling 3D printing of nanopillars with diameters of ~400 nm and aspect ratio as high as ~10. Experimentally, we observed self-recovery as collapsed and touching structures overcome stiction to stand back up. We developed a theoretical model to explain the recoverability of these sub-micron structures. Reconfigurable structural colour prints and holograms were demonstrated, indicating potential applications of the material system as a shape memory polymer suitable for sub-micron reconfigurable metamaterials. Copyright © 2022, The Authors. All rights reserved.

关键词： Van der Waals forces

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Site experimental study on smart de-icing device based on the de-icing method by the transferred current of bundled conductors

Site experimental study on smart de-icing device based on th...

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22nd International Symposium on High Voltage Engineering (ISH 2021)

作者： G. Yang X. Jiang X. Ren W. Zhou J. Ma Z. Qin State Key Laboratory of Power Transmission Equipment & System Security and New Technology School of Electrical Engineering Chongqing University No.174 Shazhengjie Shapingba Chongqing China Chongqing Electric Power Design Institute Co. Ltd No.60 Shanan street Shapingba Chongqing China

Icing seriously threatens the safety of transmission lines. Transferring the current of bundled sub-conductors through smart de-icing device is a promising de-icing method. In this study, site experiments on smart de-icing device based on the de-icing method by the transferred current of bundled conductors were carried out in the natural environment at the xuefeng mountain national field science observatory of chongqing university. The smart de-icing device was hanged on the glaze tower and connected between the 4-bundled conductors (4×LGJ400/35) and a rectifier which was equipped with other device so that a high current is acceptable for this study. In order to complete the test loop the 3-bundled conductors (3×LGJ240/30) were connected with the 4-bundled conductors (4×LGJ400/35) and the rectifier. The site experiments included three tests: the intelligent of the smart de-icing device test (test 1), the heating rate of the conductor test (test 2) and the practical effect of melt-icing test (test 3). The experimental results in this paper proved the feasibility of the transferred current of bundled conductors de-icing method, and the smart de-icing device showed a good performance, which shows the specific potential and broad application prospects

关键词： melting overhead line conductors power transmission lines transmission network calculations de-icing

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Optimization design of the reactor coolant pump flywheel comprised of multi-ring packing heavy metal alloy

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Journal of Physics: Conference Series 2021年第1期1777卷

作者： L Jiang C W Wu X J Shao Y Zhang M D Yu National Key Laboratory of Science and Technology on Reactor System Design Technology Nuclear Power Institute of China Chengdu 610041 China State Key Laboratory of Structural Analysis for Industrial Equipment Dalian University of Technology Dalian 116024 China

To improve energy storage performance of the multi-ring RCP flywheel comprised of inner hub, tungsten alloy ring and outer retainer, optimization design process for the radial thicknesses of components and interference fit assembly is demonstrated. Radial thicknesses of these components and magnitude of interference fit are set as design parameters to construct parametric analysis model. design of experiments (DOE) technique is adopted to generate design matrix for sensitive analysis. Subsequently, radial basis function (RBF) approximation is employed to search for the optimal design considering structural integrity requirement. Finally, a proper range of the magnitude of interference fit is obtained which can not only prevent neither slippage nor separation between the inner hub and tungsten alloy ring but also ensure the safety of structural strength. In addition, it is found that to ensure a high moment of inertia and energy density, a reasonable large radial thickness of tungsten alloy ring and a reasonable small radial thickness of outer retainer are required.

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The Age of Generative AI and AI-Generated Everything

arXiv

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arXiv 2023年

作者： Du, Hongyang Niyato, Dusit Kang, Jiawen Xiong, Zehui Zhang, Ping Cui, Shuguang Shen, Xuemin Mao, Shiwen Han, Zhu Jamalipour, Abbas Vincent Poor, H. Kim, Dong In School of Computer Science and Engineering Nanyang Technological University Singapore639798 Singapore School of Automation Guangdong University of Technology Key Laboratory of Intelligent Information Processing and System Integration of IoT Ministry of Education Guangzhou510006 China Guangdong-HongKong-Macao Joint Laboratory for Smart Discrete Manufacturing Guangzhou510006 China Pillar of Information Systems Technology and Design Singapore University of Technology and Design Singapore487372 Singapore State Key Laboratory of Networking and Switching Technology Beijing University of Posts and Telecommunications China Chinese University of Hong Kong Shenzhen China Department of Electrical and Computer Engineering University of Waterloo WaterlooONN2L 3G1 Canada Department of Electrical and Computer Engineering Auburn University AuburnAL36849-5201 United States Department of Electrical and Computer Engineering University of Houston HoustonTX77004 United States Department of Computer Science and Engineering Kyung Hee University Seoul446-701 Korea Republic of School of Electrical and Information Engineering University of Sydney SydneyNSW2006 Australia Department of Electrical and Computer Engineering Princeton University PrincetonNJ08544 United States Department of Electrical and Computer Engineering Sungkyunkwan University Suwon16419 Korea Republic of

Generative AI (GAI) has emerged as a significant advancement in artificial intelligence, renowned for its language and image generation capabilities. This paper presents "AIGenerated Everything" (AIGX), a concept that extends GAI beyond mere content creation to real-time adaptation and control across diverse technological domains. In networking, AIGX collaborates closely with physical, data link, network, and application layers to enhance real-time network management that responds to various system and service settings as well as application and user requirements. Networks, in return, serve as crucial components in further AIGX capability optimization through the AIGX lifecycle, i.e., data collection, distributed pre-training, and rapid decision-making, thereby establishing a mutually enhancing interplay. Moreover, we offer an in-depth case study focused on power allocation to illustrate the interdependence between AIGX and networking systems. Through this exploration, the article analyzes the significant role of GAI for networking, clarifies the ways networks augment AIGX functionalities, and underscores the virtuous interactive cycle they form. This article paves the way for subsequent future research aimed at fully unlocking the potential of GAI and networks. © 2023, CC BY.

关键词： Decision making

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Unique Bioinspired Nanowire Structures for Dual-Modal Optoelectronic Electronic Skin

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Advanced Materials 2025年 e2504266页

作者： Li, Xin-Lin Wang, Wen-Ze Li, Bo Chen, Cheng Xu, Feng-Qi Yang, Zhong-Yuan Meng, Xiang-Sen Yang, Qi-Rui Wang, Quan Zhu, Yin-Bo Liu, Jian-Wei State Key Laboratory of Precision and Intelligent Chemistry Department of Chemistry University of Science and Technology of China Anhui Hefei230026 China CAS Key Laboratory of Mechanical Behavior and Design of Materials Department of Modern Mechanics CAS Center for Excellence in Complex System Mechanics University of Science and Technology of China Hefei230027 China Division of Nanomaterials & Chemistry Hefei National Research Center for Physical Sciences at the Microscale Institute of Energy Hefei Comprehensive National Science Center Department of Chemistry Institute of Biomimetic Materials & Chemistry Anhui Engineering Laboratory of Biomimetic Materials University of Science and Technology of China Hefei230026 China

As initial basic applications expand into more complex and diverse fields, including prosthesis, the metaverse, and information encryption, the diversification, multifunctionality, and customization of electronic skin (e-skin) have increasingly become prominent research trends. However, most e-skins focus on achieving higher performance and a broader response range, lacking functionality and mode customization options. Here, a mode designable bioinspired e-skin is reported, utilizing a mechanical strategy combined with interface assembly technology, and achieving the integration of optical and electrical sensing capabilities in single functional material. Benefiting from the tunable engineering of nanowire structures, the Mode I demonstrates for the first time an anisotropic infrared-electrical combined e-skin, achieving remarkable anisotropic electrical performance with an anisotropy index (GF1/GF2) greater than 104 and stable anisotropy infrared transmittance changes even after 105 cycles at 75% strain. On the other hand, the Mode II offers an interference-resistant e-skin that maintains stable electrical performance and infrared transmittance under complex deformations based on novel 3D buckled structure. Finally, the two modes are integrated and successfully applied to the multiple encryption of customized information, presenting significant potential for confidential military projects. © 2025 Wiley-VCH GmbH.

关键词： Nanowires

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Cracking cause analysis of a baffle of the inlet guide vane in an aeroengine

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Engineering Failure Analysis 2025年 179卷

作者： Zhang, Jun Fang, Teng Liu, Weidong Xiao, Jiulin Wang, Juan Peng, Jinfang Liu, Jianhua Zhu, Minhao Tribology Research Institute State Key Laboratory of Rail Transit Vehicle System Southwest Jiaotong University Chengdu610031 China Metrology and Physical-Chemical Center AECC Aero Science and Technology Co. LTD. Chengdu610503 China Design Center AECC Chengdu Engine Co. LTD. Chengdu610503 China State-owned Chuanxi Machine Factory Chendu611930 China Key Laboratory of Advanced Technologies of Materials of Ministry of Education Southwest Jiaotong University Chengdu610031 China

Riveting technology is extensively employed in thin-walled structural connections of aircraft. However, the clamped areas of the riveted connections are susceptible to fretting damage under alternating load. This paper focuses on the baffle cracking problem of an inlet guide vane in an aero-engine during the bench test. The failure mechanisms and root causes of the cracks were comprehensively investigated through stereomicroscopy, fractographic analyses, metallographic examination, chemical composition analysis, mechanical testing, and finite element simulations. The results show that the baffle conforms to TA21 titanium alloy specifications. Fretting fatigue in the clamped area at the rivet-hole interface was identified as the primary cause of the baffle's premature cracking. Meanwhile, finite element analyses further reveal that cracks originating within the clamped areas of the baffle correlate with localized von-Mises stress concentrations induced by the riveting process and exacerbated by the first-order bending vibration of the inlet guide vane. © 2025

关键词： Bending tests

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Experimental research of jet diameter on heat transfer in a small steel containment

Experimental research of jet diameter on heat transfer in a ...

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2019 Transactions of the American Nuclear Society, ANS 2019

作者： Wang, Shengfei Liu, Yusheng Jiang, Xiaowei Beijing Key Laboratory of Passive Safety Technology for Nuclear Energy North China Electric Power University 2 Beinong Road Changping District Beijing102206 China Nuclear and Radiation Safety Center MEP Beijing100084 China Reactor System Design Technology Laboratory Nuclear Power Institute of China Chengdu612013 China

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Data-driven parametric design of additively manufactured hybrid lattice structure for stiffness and wide-band damping performance

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Additive Manufacturing Frontiers 2025年第2期4卷

作者： Li, Chenyang Yuan, Shangqin Zhang, Han Li, Shaoying Li, Xinyue Zhu, Jihong State IJR Center of Aerospace Design and Additive Manufacturing School of Mechanical Engineering Northwestern Polytechnical University Xi'an 710072 China Key Laboratory of Metal High-Performance Additive Manufacturing and Innovative Design MIIT China Northwestern Polytechnical University Xi'an 710072 China Institute of Intelligence Material and Structure Unmanned System Research Institute Northwestern Polytechnical University Xi'an 710072 China Aircraft Strength Research Institute of China Xi'an 710065 China Modern Control Technology Research Institute Xi'an 710065 China

The outstanding comprehensive mechanical properties of newly developed hybrid lattice structures make them useful in engineering applications for bearing multiple mechanical loads. Additive-manufacturing technologies make it possible to fabricate these highly spatially programmable structures and greatly enhance the freedom in their design. However, traditional analytical methods do not sufficiently reflect the actual vibration-damping mechanism of lattice structures and are limited by their high computational cost. In this study, a hybrid lattice structure consisting of various cells was designed based on quasi-static and vibration experiments. Subsequently, a novel parametric design method based on a data-driven approach was developed for hybrid lattices with engineered properties. The response surface method was adopted to define the sensitive optimization target. A prediction model for the lattice geometric parameters and vibration properties was established using a backpropagation neural network. Then, it was integrated into the genetic algorithm to create the optimal hybrid lattice with varying geometric features and the required wide-band vibration-damping characteristics. Validation experiments were conducted, demonstrating that the optimized hybrid lattice can achieve the target properties. In addition, the data-driven parametric design method can reduce computation time and be widely applied to complex structural designs when analytical and empirical solutions are unavailable. © 2025 The Author(s)

关键词： Data-driven Hybrid lattice structure Machine-learning method Wide-band damping

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Efficiency analysis of a two-phase natural circulation loop and design improvement 27

Efficiency analysis of a two-phase natural circulation loop ...

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27th International Conference on Nuclear Engineering: Nuclear Power Saves the World!, ICONE 2019

作者： Wang, Dongqing Zhang, Xiaoying Ma, Quan Wang, Chunyu Wang, Long Ma, Jun Sino-French Institute of Nuclear Engineering and Technology Sun Yet-Sen University Zhuhai Guangdong China State Key Laboratory of Reactor System Design Technology Nuclear Power Institute of China Chengdu Sichuan China China Nuclear Power Technology Research Institute Shenzhen Guangdong China Sino-French Inst. of Nuclear Engineering and Technology Sun Yet-Sen University Zhuhai Guangdong China

ISBN: (纸本)9784888983051

In this paper, the driving power conversion rate of a two-phase natural circulation loop is analyzed numerically. In operation of the two-phase natural circulation loop, part of thermal energy is converted into driving power, that is, the gravity difference between steam and water in vertical loops. The power drives circulation flow in this loop and it is converted into kinetic energy of the fluid, which is partially dissipated eventually with flow resistance. In steady state, the conversion rate is equal to the dissipation rate. In this study, modeling and simulation of a general two-phase natural circulation loop are performed. The dissipation rate of kinetic energy with flow resistance is calculated, which is equal to the driving power conversion rate in value. Furthermore, the conversion rate from thermal energy to the power is obtained with the conversion rate calculated indirectly and heat transfer rate of the heat source. Simulation results indicate that the conversion rate can be as low as 0.01%. Based on this result, design improvement of the natural circulation loop is proposed. In this design, the thermoelectric material Bi2Te3 is attached outside part of the heat exchanger tubes. With the material, the temperature difference between fluid inside and outside the heat exchanger leads to voltage, and the heat exchanger with the material actually works as a thermoelectric generator (TEG). In this way, part of thermal energy is converted into electricity with an efficiency which is much greater than that of original two-phase natural circulation loop. The electricity converted is further used to enhance circulation flow of water through a pump and natural convection outside the heat exchanger with a group of agitators. With this design, the driving power conversion rate of the two-phase natural circulation loop is increased, the driving force is enhanced, circulation flow and heat transfer can be improved. Copyright © 2018-2019 by JSME

关键词： Thermal energy

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Study on surface pore characteristic and hydrophilicity of carbon materials in HTGR 27

Study on surface pore characteristic and hydrophilicity of c...

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27th International Conference on Nuclear Engineering: Nuclear Power Saves the World!, ICONE 2019

作者： Ma, Sheng-Chao Shen, Kai-Yue Yin, Hua-Qiang He, Xue-Dong Li, Jun Meng, Ying-Chao Institute of Nuclear and New Energy Technology Collaborative Innovation Center of Advanced Nuclear Energy Technology Key Laboratory of Advanced Reactor Engineering and Safety of Ministry of Education Tsinghua University Beijing100084 China Nuclear Power Design and Research Sub-institute Science and Technology on Reactor System Design Technology Laboratory Nuclear Power Institute of China Chengdu610213 China Institute for Chemical and Bioengineering Department of Chemistry and Applied Biosciences Swiss Federal Institute of Technology Zurich Zurich8093 Switzerland

ISBN: (纸本)9784888983051

Lots of porous carbon materials, including boron-containing carbon (BC) and isostatic pressure graphite (IG-110), are used in high-temperature gas cooled reactor (HTGR). To prevent corrosion caused by carbon-water reaction at high temperature, water absorbed in the materials needs to be removed before the reactor operation. It has become the consensus of the researchers that the pore morphology of the material has an important influence on the physical adsorption and desorption process of the gas. Therefore, it is significant to explore the migration mechanism of moisture in carbon materials by studying the pore characteristics and hydrophilic properties of the material surface. Scanning electron microscopy (SEM) and contact angles tests were used to study the surface pore characteristic and hydrophilicity of BC and IG-110. The results of SEM scanning show that a large number of irregular micropores and cracks were found on the surface of BC, while the structure of IG-110 was more compact, and the size and number of pores were obviously smaller. 3 μL and 5 μL water drops were used to contact angle tests, it was found that the average contact angle of the BC surface with water droplets is 118.04°, which is greater than that of IG-110, measured as 112°. Finally, the water vapor absorption experiment of these two materials were carried out to verify that the pore structure and hydrophilicity have an effect on water absorption, and the pore structure has a more decisive effect on moisture absorption than the hydrophilicity. © 2019 American Society of Mechanical Engineers (ASME). All rights reserved.

关键词： Scanning electron microscopy

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