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One-step printable platform for high-efficiency metasurfaces down to the deep-ultraviolet region

Light(science & Applications) 2023年第4期12卷 551-557页

作者： Joohoon Kim Wonjoong Kim Dong Kyo Oh Hyunjung Kang Hongyoon Kim Trevon Badloe Seokwoo Kim Chanwoong Park Hojung Choi Heon Lee Junsuk Rho Department of Mechanical Engineering Pohang University of Science and Technology(POSTECH)Pohang 37673Republic of Korea Department of Materials Science and Engineering Korea UniversitySeoul 02841Republic of Korea Department of Chemical Engineering Pohang University of Science and Technology(POSTECH)Pohang 37673Republic of Korea POSCO-POSTECH-RIST Convergence Research Center for Flat Optics and Metaphotonics Pohang 37673Republic of Korea NationallInstitute of Nanomaterials Technology(NINT) Pohang 37673Republic of Korea

A single-step printable platform for ultraviolet(UV)metasurfaces is introduced to overcome both the scarcity of low-loss UV materials and manufacturing limitations of high cost and low *** dispersing zirconium dioxide(ZrO_(2))nanoparticles in a UV-curable resin,ZrO_(2)nanoparticle-embedded-resin(nano-PER)is developed as a printable material which has a high refractive index and low extinction coefficient from near-UV to *** ZrO_(2)nano-PER,the UV-curable resin enables direct pattern transfer and ZrO_(2)nanoparticles increase the refractive index of the composite while maintaining a large *** this concept,UV metasurfaces can be fabricated in a single step by nanoimprint *** a proof of concept,UV metaholograms operating in near-UV and deep-UV are experimentally demonstrated with vivid and clear holographic *** proposed method enables repeat and rapid manufacturing of UV metasurfaces,and thus will bring UV metasurfaces more close to real life.

关键词： resin high enable

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Micromechanical modeling and evaluation of CNTs reinforced magnesium matrix composites based on stress softening modified constitutive model

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Journal of Magnesium and Alloys 2025年第1期13卷 243-259页

作者： Mingjie Shen Baojian Han Tao Ying Jingya Wang Liping Zhou Xiangzhen Xue Yang Gao Zongyang Yang College of Mechanical&Electrical Engineering Shaanxi University of Science&TechnologyXi’an 710021China National Engineering Research Center of Light Alloy Net Forming School of Materials Science and EngineeringShanghai Jiao Tong UniversityShanghai 200240China Guizhou provincial key laboratory for aero-engine rotors structural integrity Guiyang550081China Aviation Military Representative Office of the Army Arament Department Aviation Military Representative Bureau in Shanghai Shanghai 200032China

Heterogeneous composites have strong anisotropy and are prone to dynamic recrystallization during hot compression,making the me-chanical response highly ***,it is a very challenging task to intellectually judge the thermal deformation characteristics of magnesium matrix composites(MgMCs).In view of this,this paper introduces a method to accurately solve the thermoplastic deformation of ***,a hot compression constitutive model of magnesium matrix composites based on stress softening correction was ***,the complex quasi-realistic micromechanics modeling of heterogeneous magnesium matrix composites was *** introducing the recrystallization softening factor and strain parameter into the constitutive equation,the accurate prediction of the global rheological response of the composites was realized,and the accuracy of the new constitutive model was ***,the thermal pro-cessing map of magnesium matrix composites was established,and the suitable processing range was *** paper has certain guiding values for the prediction of the thermodynamic response and thermal processing of magnesium matrix composites.

关键词： Newly constitutive model Prediction of the global rheological behavior Magnesium matrix composites

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Conversion of magnetron-sputtered sacrificial intermediate layer into a stable FeCo-LDH catalyst for oxygen evolution reaction

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Nano Research 2024年第5期17卷 4307-4313页

作者： Zhiquan Lang Guang-Ling Song Xingpeng Liao Wenzhong Huang Yixing Zhu Haipeng Wang Dajiang Zheng Center for Marine Materials Corrosion and Protection College of MaterialsXiamen UniversityXiamen 361005China Department of Ocean Science and Engineering Southern University of Science and TechnologyShenzhen 518055China State Key Laboratory of Physical Chemistry of Solid Surfaces Xiamen UniversityXiamen 361005China The University of Queensland St.LuciaOLD 4072Australia State Key Laboratory of Advanced Technology for Materials Synthesis and Processing Wuhan University of TechnologyWuhan 430070China Department of Mechanical Engineering Tsinghua UniversityBeijing 100084China

Controllable and scalable preparation of electrocatalyst materials holds significant importance for their practical *** sputtering is a highly effective synthesis method,known for its producing uniform films and allowing easy control of component *** this paper,we propose an in-situ synthesis method for layered double hydroxide(LDH)electrocatalysts through sacrificing magnetron sputtered *** resulting FeCo-LDH catalyst demonstrated a low overpotential of only 300 mV at 10 mA·cm^(-2).Furthermore,we conducted spectroscopic analysis to investigate the surface changes of the catalysts during the oxygen evolution reaction(OER)*** findings indicated that the formation of Co oxyhydroxides plays a beneficial role in enhancing the catalytical performance of the FeCo-LDH for OER *** restructuring strategy of converting a magnetron-sputtered sacrificial film into a catalytical LDH introduces a new avenue to the synthesis of transition metal-based electrocatalysts.

关键词： magnetron co-sputtering surface reconstruction electrocatalyst oxygen evolution reaction

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Enhanced Heat Transfer Technology Based on Emission Reduction and Carbon Reduction in Cutting and Grinding

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Chinese Journal of mechanical engineering 2023年第4期36卷 1-3页

作者： Changhe Li Yanbin Zhang Shubham Sharma School of Mechanical and Automotive Engineering Qingdao University of TechnologyQingdao 266520China Department of Mechanical Engineering and Advanced Materials Science Regional Center for Extension and DevelopmentCouncil of Scientific and Industrial Research(CSIR)-Central Leather Research Institute(CLRI)Jalandhar 144021India

Huge carbon emissions in machining process,which characterized by high energy consumption and usage of non-renewable resources,is becoming an obsession in the past *** the face of the international strategy of carbon peak,it is imperative to eliminate the usage of mineral cutting fluids and reduce energy consumption and carbon emissions by green cutting/grinding technologies,such as dry cutting,minimum quantity lubrication(MQL).

关键词： grinding lubrication eliminate

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Static analysis of elastic cable structures under mechanical load using discrete catenary theory

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Fundamental Research 2023年第6期3卷 967-973页

作者： Weicheng Huang Dongze He Dezhong Tong Yuzhen Chen Xiaonan Huang Longhui Qin Qingguo Fei School of Mechanical Engineering Southeast UniversityNanjing 211189China Jiangsu Engineering Research Center of Aerospace Machinery Southeast UniversityNanjing 211189China Department of Mechanical and Aerospace Engineering University of CaliforniaLos AngelesCA 90095USA Department of Mechanical Engineering and Materials Science Yale UniversityNew HavenCT 06511USA

In this paper,the nonlinear mechanical response of elastic cable structures under mechanical load is studied based on the discrete catenary theory.A cable net is discretized into multiple nodes and edges in our numerical approach,which is followed by an analytical formulation of the elastic energy and the associated Hessian matrix to realize the dynamic simulation.A fully implicit framework is proposed based on the discrete differential geometry(DDG)*** equilibrium configuration of a target object is derived by adding damping force into the system,known as the dynamic relaxation *** mechanical response of a single suspended cable is investigated and compared with the analytical solution for cross-validation.A more intricate scenario is further discussed in detail,where a structure consisting of multiple slender cables is connected through *** the robustness and efficiency of our discrete numerical framework,a systematic parameter sweep is performed to quantify the force displacement relationships of nets with the different number of cables and different directions of ***,an empirical scaling law is provided to account for the rigidity of elastic cable net in terms of its geometric properties,material characteristics,component numbers,and cable *** results would provide new insight in revealing the connections between flexible structures and tensegrity structures,and could motivate innovative designs in both mechanical and civil engineered equipment.

关键词： Cable structures Rigidity Solid mechanics Computational mechanics Numerical simulation Nonlinearity

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Thermal conductivity suppression in uranium-doped thorium dioxide due to phonon-spin interactions

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Journal of Materiomics 2024年第3期10卷 709-715页

作者： Zilong Hua Saqeeb Adnan Amey R.Khanolkar Karl Rickert David B.Turner Timothy A.Prusnick J.Matthew Mann David H.Hurley Marat Khafizov Cody A.Dennett Materials Science and Engineering Department Idaho National LaboratoryIdaho FallsID83415USA Department of Mechanical and Aerospace Engineering The Ohio State UniversityColumbusOH43210USA KBR DaytonOH45431USA Azimuth Corporation FairbornOH45324USA Air Force Research Laboratory Wright-Patterson AFBOH45433USA Department of Nuclear Science and Engineering Massachusetts Institute of TechnologyCambridgeMA02139USA

In this work,impact of low level of uranium(U)atom substitution on thermal conductivity of thorium dioxide(ThO_(2))is ***_(2)is an electronic insulator with a wide optical band-gap and no unpaired electrons whose thermal transport is governed by phonons.U-substitution introduces unpaired f-electrons resulting in paramagnetic behavior of UeThO_(2)at room temperature,which significantly suppresses its thermal conductivity.A single crystal of UeThO_(2)with graded composition of U is grown using a hydrothermal synthesis method,and thermal conductivity measurements are performed in re-gions with uniform composition of U at levels of 0%,6%,9%and 16%.Measured thermal conductivity profiles over 77e300 K temperature range are analyzed using an analytical expression for phonon-mediated thermal transport based on Klemens-Callaway *** dependent thermal con-ductivity is found to deviate significantly from the Rayleigh scattering trend expected for a simple substitutional point defect with a small perturbation to mass and interatomic *** the resonant scattering term,observed large suppression of thermal conductivity at low temperatures can be closely ***,the extracted phonon-spin coupling constants imply a nonlinear relation of phonon-spin interaction intensity with respect to U doping *** study reveals how phonon-spin scattering contributed by unpaired f-electrons in U atoms influences thermal transport in the UeThO_(2)system.

关键词： Phonon-spin interactions Thermal conductivity UdThO_(2)system

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Photothermal superhydrophobic copper nanowire assemblies: fabrication and deicing/defrosting applications

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International Journal of Extreme Manufacturing 2023年第4期5卷 472-484页

作者： Siyan Yang Qixun Li Bingang Du Yushan Ying Yijun Zeng Yuankai Jin Xuezhi Qin Shouwei Gao Steven Wang Zuankai Wang Rongfu Wen Xuehu Ma State Key Laboratory of Fine Chemicals&Frontier Science Center for Smart Materials School of Chemical EngineeringDalian University of TechnologyDalian 116024People’s Republic of China Department of Mechanical Engineering City University of Hong KongHong Kong 999077People’s Republic of China Department of Mechanical Engineering The Hong Kong Polytechnic UniversityHong Kong 999077People’s Republic of China

Ice and frost buildup continuously pose significant challenges to multiple *** a promising de-icing/defrosting alternative,designing photothermal coatings that leverage on the abundant sunlight source on the earth to facilitate ice/frost melting has attracted tremendous attention ***,previous designs suffered from either localized surface heating owing to the limited thermal conductivity or unsatisfied meltwater removal rate due to strong water/substrate ***,we developed a facile approach to fabricate surfaces that combine photothermal,heat-conducting,and superhydrophobic properties into one to achieve efficient de-icing and *** copper nanowire assemblies,such surfaces were fabricated via the simple template-assisted electrodeposition method,allowing us to tune the nanowire assembly geometry by adjusting the template dimensions and electrodeposition *** highly ordered copper nanowire assemblies facilitated efficient sunlight absorption and lateral heat spreading,resulting in a fast overall temperature rise to enable the thawing of ice and *** promoted by the excellent water repellency of the surface,the thawed ice and frost could be spontaneously and promptly *** this way,the all-in-one design enabled highly enhanced de-icing and defrosting performance compared to other nanostructured surfaces merely with superhydrophobicity,photothermal effect,or the combination of *** particular,the defrosting efficiency could approach∼100%,which was the highest compared to previous ***,our approach demonstrates a promising path toward designing highly effective artificial deicing/defrosting surfaces.

关键词： nanowire photothermal superhydrophobic de-icing defrosting

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Superb creep lives of Ni-based single crystal superalloy through size effects and strengthening heterostructure γ/γ' interfaces

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National science Open 2024年第4期3卷 145-155页

作者： Haibo Long Yunsong Zhao Junbo Zhao Xiaoyi Yuan Hao Fan Yushi Luo Wei Li Zibing An Shengcheng Mao Gang Liu Xiaodong Han Beijing Key Laboratory of Microstructure and Property of Advanced Materials Beijing University of TechnologyBeijing 100124China Science and Technology on Advanced High Temperature Structural Materials Laboratory Beijing Institute of Aeronautical MaterialsBeijing 100095China Department of Materials Science and Engineering Southern University of Science and TechnologyGuangdong 518055China Department of Mechanical Engineering Southern University of Science and TechnologyGuangdong 518055China

This study presents a design strategy to enhance the high-temperature creep resistance of Ni-based *** strategy focuses on two principles:(1)minimizing the dimensions ofγ/γ′interfaces andγchannels by reducing the size of theγ′phase;(2)key alloy composition control to strengthen the heterostructureγ/γ′*** strategy proved very effective by the designed three superalloys'prolonged creep *** alloy exhibits ultra-long creep life by 388 h at 1100°C/137 MPa,which runs at the highest level among those alloys without Ru *** Ru addition,an alloy that lasted for 748 h with a creep strain of~6%at 1110°C/137 MPa is *** study provides a new route of high-temperature creep lives through heterostructure interfacial design with size effects and key alloying elements.

关键词： Ni-based single crystal superalloy creep properties dislocation behavior interface structure size effect alloy composition

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Higher-order electroelastic modelling of piezoelectric cylindrical nanoshell on elastic matrix

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Defence Technology（防务技术） 2022年第5期18卷 781-796页

作者： Xiao-ping Huang Peng-fei Hu Mohammad Arefi College of Mechanical and Electrical Engineering Nanning UniversityNanning530000GuangxiChina School of Materials Science and Engineering Luoyang Institute of TechnologyLuoyang471023HenanChina Department of Solid Mechanics Faculty of Mechanical EngineeringUniversity of KashanKashan87317-51167Iran

This paper develops electro-elastic relations of functionally graded cylindrical nanoshell integrated with intelligent layers subjected to multi-physics loads resting on elastic *** piezoelectric layers are actuated with external applied *** nanocore is assumed in-homogeneous in which the material properties are changed continuously and gradually along radial ***-order shear deformation theory is used for the description of kinematic relations and electric potential distribution is assumed as combination of a linear function along thickness direction to show applied voltage and a longitudinal ***-elastic size-dependent constitutive relations are developed based on nonlocal elasticity theory and generalized Hooke’s *** principle of virtual work is used to derive governing equations in terms of four functions along the axial and the radial directions and longitudinal electric potential *** numerical results including radial and longitudinal displacements are presented in terms of basic input parameters of the integrated cylindrical nanoshell such as initial electric potential,small scale parameter,length to radius ratio and two parameters of *** is concluded that both displacements are increased with an increase in small-scale parameter and a decrease in applied electric potential.

关键词： Higher-order shear deformation theory Electro-elastic bending Functionally graded materials Size-dependent analysis Nonlocal parameter Cylindrical nano shell

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Bioinspired magnetic cilia:from materials to applications

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Microsystems & Nanoengineering 2023年第6期9卷 107-128页

作者： Seongjin Park Geonjun Choi Minsu Kang Woochan Kim Jangho Kim Hoon Eui Jeong Department of Mechanical Engineering Ulsan National Institute of Science and Technology(UNIST)Ulsan44919Republic of Korea Department of Convergence Biosystems Engineering Chonnam National UniversityGwangju61186Republic of Korea Interdisciplinary Program in IT-Bio Convergence System Chonnam National UniversityGwangju61186Republic of Korea

Microscale and nanoscale cilia are ubiquitous in natural systems where they serve diverse biological *** artificial magnetic cilia have emerged as a highly promising technology with vast potential applications,ranging from soft robotics to highly precise *** this review,we comprehensively discuss the roles of cilia in nature and the various types of magnetic particles utilized in magnetic cilia;additionally,we explore the top-down and bottom-up fabrication techniques employed for their ***,we examine the various applications of magnetic cilia,including their use in soft robotics,droplet and particle control systems,fluidics,optical devices,and ***,we present our conclusions and the future outlook for magnetic cilia research and development,including the challenges that need to be overcome and the potential for further integration with emerging technologies.

关键词： magnetic overcome precise

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