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7th IEEE International Conference on Progress in Informatics and Computing, PIC 2020

作者： Zhang, Xue Xue, Junjie Zhou, Junhua Shi, Guoqiang Yu, Yan Nanjing University of Science and Technology School of Computer Science and Engineering Nanjing China Beijing Simulation Center Beijing Complex Product Advanced Manufacturing Engineering Research Center Beijing China State Key Laboratory of Intelligent Manufacturing System Technology Beijing Institute of Electronic System Engineering Beijing China Science and Technology on Space System Simulation Laboratory Beijing Simulation Center Beijing China

ISBN: (纸本)9781728170862

Large-scale equipment presents the characteristics of technology-intensive, knowledge-intensive and complex, which brings high investment and high risk to equipment acquisition. This paper analyzes the various components of equipment acquisition to fully apply modeling and simulation technology to each stage of it. On the basis of multi-objective optimization theory, the objective function of the lowest risk and lowest cost of simulation-based acquisition (SBA) is proposed. Then establishing a multi-objective optimization model for simulation-based acquisition according to the corresponding constraints. The nondominated sorting genetic algorithm II (NSGA II) and multi-objective particle swarm optimization (MOPSO) algorithms are used to optimize the model, and the majority voting method is used for integration. The comparison of simulation examples proves that the multi-objective optimization model oriented to SBA designed in this paper can effectively realize the optimization of each objective of SBA under cost constraints. And the feasibility and efficiency of optimization solution are guaranteed. © 2020 IEEE.

关键词： Multiobjective optimization

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Nanostructuring of Zn–Li-based alloys through severe plastic deformation: Microstructure, mechanical properties, and corrosion behaviors

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Nano Materials science 2024年

作者： Huang, He Fang, Liudang Tong, Zhipei Gong, Gencheng Yu, Hui Kulyasova, Olga Valiev, Ruslan Z. Xia, Dandan Zheng, Yufeng Bian, Dong School of Materials Science and Engineering Zhengzhou University Zhengzhou450003 China Southern Medical University Guangzhou510080 China School of Medicine South China University of Technology Guangzhou510006 China Guangzhou Key Laboratory of Spine Disease Prevention and Treatment Department of Orthopaedic Surgery The Third Affiliated Hospital of Guangzhou Medical University Guangzhou510515 China Institute of Physics of Advanced Materials Ufa State Aviation Technical University Ufa450008 Russia Department of Dental Materials Peking University School and Hospital of Stomatology & National Center for Stomatology & National Clinical Research Center for Oral Diseases & National Engineering Research Center of Oral Biomaterials and Digital Medical Devices & Beijing Key Laboratory of Digital Stomatology & NHC Key Laboratory of Digital Stomatology & NMPA Key Laboratory for Dental Materials Beijing100081 China School of Materials Science and Engineering Peking University Beijing100871 China International Research Organization for Advanced Science and Technology Kumamoto University Kumamoto 860-8555 Japan

To date, nanostructuring through plastic deformation has rarely been reported in biodegradable zinc (Zn) based alloys that have great potential in load-bearing conditions. Here, typical high-strength Zn–Li-based alloys were subjected to SPD processes, including equal channel angular pressing (ECAP) and high-pressure torsion (HPT), to achieve nanostructured microstructures. The effects of SPD on the microstructures, mechanical properties, and corrosion behaviors were generally investigated. The two SPD routes resulted in totally different microstructures. ECAPed samples processed at 150 °C exhibited a complicated multilevel structure (nm to μm) with mixed Zn equiaxed grains and lamellar-like eutectoid regions (Zn + α-LiZn4), and HPTed ones (25 °C) possessed a fully dynamically recrystallized (DRXed) microstructure with an average grain size below 0.4 μm. The tensile strength of the SPD samples could reach 500 MPa. Meanwhile, HPTed samples exhibited extraordinary fracture elongations higher than 100 %, because of a different grain boundary sliding deformation mechanism. HPTed samples and ECAPed samples displayed different corrosion patterns, and the former exhibited a much higher corrosion rate in Hank's solution, possibly due to the accelerated corrosion at grain boundaries. In summary, SPD is an efficient way to refine the microstructure of biodegradable Zn-based alloys, possibly improving their performances and clinical applications. © 2024 Chongqing University

关键词： Equal channel angular pressing

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Effect of compound surface modification of shot peening and DLC coating on surface integrity and fatigue properties of gear steel 16Cr3NiWMoVNbE

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Heliyon 2024年第18期10卷 e37991页

作者： Yu, Bo Xu, Chunling Gao, Kaixiong Yang, Wenming Wang, Xin Sun, Zhongwu Zhang, Bin Tang, Zhihui Surface Engineering Institution AECC Beijing Institute of Aeronautical Materials Beijing 100095 China Aviation Key Laboratory of Advanced Corrosion and Protection on Aviation Materials AECC Beijing Institute of Aeronautical Materials Beijing 100095 China State Key Laboratory of Solid Lubrication Lanzhou Institute of Chemical Physics Chinese Academy of Sciences Lanzhou China School of Mechanical Engineering University of Science and Technology Beijing 100083 China School of Material Science and Engineering Nanchang Hangkong University Nanchang 330063 China Process Technology Center AECC Harbin Dongan Aero-engine Co. Ltd Harbin 150066 China

We conducted a study on the surface compound modification of shot peening and pure carbon DLC coating to simultaneously meet the requirements of wear resistance and fatigue resistance of spline structure. The effects of surface compound modification were investigated on the surface morphology, residual stress profile, microstructure, and nano-indentation hardness of 16Cr3NiWMovNbE gear steel, and conducted a comparative study on fatigue performance. The results show that the surface compound modification inherits the surface morphology and compressive residual stress gradient of shot peening, while the surface residual stress is slightly smaller than that of shot peening. In addition, surface compound modification still reflects the characteristics of high hardness and high fracture resistance of DLC coatings. Under the bending load based on spline tooth root, compared to the original specimen, the fatigue life after shot peening, pure carbon DLC coating, and surface compound modification is increased by 3.68, 2.35, and 3.36 respectively. Although the compound modified surface still maintains the shot peening morphology with a increasing surface roughness and stress concentration coefficient, the 100 μm-depth compressive residual stress profile and the subgrain refinement layer introduced, as well as the hard surface layer with good load-bearing capacity, have played the role of fatigue strengthening. © 2024

关键词： DLC gradient coating Fatigue hot peening Surface integrity

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Reconstructing the Nanoscale Porous Structures in Coal-Based Membranes by Ultrafast High-Temperature Sintering for Solar-Driven Water Treatment

SSRN

引用

SSRN 2023年

作者： Liu, Chih-Chin Chen, Rong Wei, Yanzhuo Huang, Yang Zhang, Zhijun Zhao, Yixin Fu, Tairan Hu, Chuxiong Huang, Xia Zang, Xining Department of Mechanical Engineering Tsinghua University Beijing100084 China Key Laboratory for Advanced Materials Processing Technology Ministry of Education Tsinghua University Beijing100084 China State Key Joint Laboratory of Environment Simulation and Pollution Control School of Environment Tsinghua University Beijing100084 China Department of Thermal Engineering Tsinghua University Beijing100084 China School of Chemical and Environmental Engineering China University of Mining and Technology Beijing100083 China Key Laboratory for Thermal Science and Power Engineering Ministry of Education China Beijing Key Laboratory for Precise Mining of Inter grown Energy and Resources China

Lignite, a low-grade coal, accounts for over 40% of the global coal reserves. The use of lignite has been limited compared to other grades due to its low calorific value, high impurities content, and elevated volatile matter. Exploring a scalable and environment-friendly approach to upgrade lignite will offer new opportunities. In this work, Ultrafast High-Temperature Carbonization (UHC) has been developed to carbonize lignite and modify its nanoscale structure to construct a conductive porous membrane. The whole process takes only 30 s with an ultrafast heating rate exceeding 2400°C/min and a maximum temperature over 1500°C. Upon heating the pore structures in the coal membrane evolves into micro- and mesopores with a specific surface area of over 300 m2/g. The carbonized coal-based membrane provides superior performance as a solar evaporator for water treatment, due to its interconnected porous structures, hydrophilicity, and over 85% absorption of full-band visible light. Under 1 sun solar irradiation, the membrane shows over 98.2% removal rate of salts, heavy metal ions, and volatile organic compounds (VOCs). © 2023, The Authors. All rights reserved.

关键词： Metal ions

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Fatigue Crack Growth Behavior of Different Zones in an Annealed Automatic Gas Tungsten Arc Weld Joint of TA16 and TC4 Titanium Alloys

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Journal of Wuhan University of technology(Materials science) 2020年第6期35卷 1090-1097页

作者： SHAO Ling WU Sujun PENG Wenya DATYE Amit JU Hongbo LIU Ying Research Institute of Zhejiang University-Taizhou Zhejiang UniversityTaizhou 318000China School of Materials Science and Engineering Beihang UniversityBeijing 100191China AECC Hunan Aviation Powerplant Research Institute Zhuzhou 412000China Department of Mechanical Engineering&Materials Science Yale UniversityNew HavenCT 06511USA Key Laboratory of Advanced Welding Technology of Jiangsu Province Jiangsu University of Science and TechnologyZhenjiang 212003China Institute of Technology of Aircraft Engine Beijing Research Institute of Aviation EngineeringBeijing 100024China

Based on the investigated microstructure of different zones in the annealed automatic gas tungsten arc weld joint of TA16 and TC4 titanium alloys,the mechanical property of them was assessed under fatigue crack growth rate *** evaluation of fatigue crack growth rate,three points bending specimens were *** correlation between the range of stress intensity factor and crack growth rate was determined in different zones of the annealed weld *** crack growth rates were obviously different in different zones of weld joint of dissimilar titanium alloys,due to their different *** electron microscope examinations were conducted on the fracture surface in order to determine the relevant fracture mechanisms and crack growth mechanisms with respect to the details of microstructure.

关键词： dissimilar titanium alloys joining weld joint microstructure fatigue crack growth rate fracture

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Intrinsic mechanical behavior of MgAgSb thermoelectric material:An ab initio study

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Journal of Materiomics 2020年第1期6卷 24-32页

作者： Guodong Li Qi An Umut Aydemir Sergey I.Morozov Bo Duan Pengcheng Zhai Qingjie Zhang William A.Goddard Ⅲ Hubei Key Laboratory of Theory and Application of Advanced Materials Mechanics School of ScienceWuhan University of TechnologyWuhan430070China State Key Laboratory of Advanced Technology for Materials Synthesis and Processing Wuhan University of TechnologyWuhan430070China Department of Chemical and Materials Engineering University of Nevada RenoRenoNV89557USA Department of Chemistry Koc UniversitySariyerIstanbul34450Turkey Boron and Advanced Materials Research Center Koc UniversitySariyerIstanbul34450Turkey Department of Computer Simulation and Nanotechnology South Ural State UniversityChelyabinsk454080Russia Materials and Process Simulation Center California Institute of TechnologyPasadenaCA91125USA

α-MgAgSb based thermoelectric(TE)device attracts much attention for its commercial application because it shows an extremely high conversion efficiency of ~8.5% under a temperature difference of 225 ***,the mechanical behavior of α-MgAgSb is another serious consideration for its engineering ***,we apply density functional theory(DFT)simulations to examine the intrinsic mechanical properties of all three MgAgSb phases,including elastic properties,shear-stress-shear-strain relationships,deformation and failure mechanism under ideal shear and biaxial shear *** find that the ideal shear strength of α-MgAgSb is 3.25 GPa along the most plausible(100)<010>slip *** strength is higher than that of β-MgAgSb(0.80 GPa)and lower than that of γ-MgAgSb(3.43 GPa).The failure of α-MgAgSb arises from the stretching and breakage of MgeSb bond α-MgAgSb under pure shear load,while it arises from the softening of MgeAg bond and the breakage of AgeSb bond under biaxial shear *** suggests that the deformation mechanism changes significantly under different loading conditions.

关键词： MgAgSb thermoelectric materials Density functional theory Ideal strength Deformation mechanism

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Topological dissipative Kerr soliton combs in a valley photonic crystal resonator

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Physical Review B 2023年第20期108卷 205421-205421页

作者： Zhen Jiang Lefeng Zhou Wei Li Yudong Li Liangsen Feng Tengfei Wu Chun Jiang Guangqiang He State Key Laboratory of Advanced Optical Communication Systems and Networks Department of Electronic Engineering Shanghai Jiao Tong University Shanghai 200240 People's Republic of China SJTU Pinghu Institute of Intelligent Optoelectronics Department of Electronic Engineering Shanghai Jiao Tong University Shanghai 200240 People's Republic of China Science and Technology on Metrology and Calibration Laboratory Changcheng Institute of Metrology & Measurement Aviation Industry Corporation of China Beijing 100095 People's Republic of China

Topological phases have become an enabling role in exploiting new applications of nonlinear optics in recent years. Here we theoretically propose a valley photonic crystal resonator emulating topologically protected dissipative Kerr soliton combs. It is shown that topological resonator modes can be observed in the resonator. Moreover, we also simulate the dynamic evolution of the topological resonator with the injection of a continuous-wave pump laser. We find that the topological optical frequency combs evolve from Turing rolls to chaotic states, and eventually into single soliton states. More importantly, such dissipative Kerr soliton combs generated in the resonator are inborn topologically protected, showing robustness against sharp bends and structural disorders. Our design supporting topologically protected dissipative Kerr soliton combs could be implemented experimentally in on-chip nanofabricated photonic devices.

关键词： Nonlinear optics Photonic crystals Topological effects in photonic systems

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The Study of Pt/Zeolites for Co Oxidation: Effects of Skeleton Structure and Si/Al Ratio

SSRN

引用

SSRN 2023年

作者： Tian, Xudong Shan, Yulong Yu, Yunbo Zhang, Jian Yan, Zidi Sun, Yu Ding, Wenqing School of Rare Earths University of Science and Technology of China Hefei230026 China Ganjiang Innovation Academy Chinese Academy of Sciences Ganzhou341000 China State Key Joint Laboratory of Environment Simulation and Pollution Control Research Center for Eco-Environmental Sciences Chinese Academy of Sciences Beijing100085 China Beijing Advanced Innovation Center for Soft Matter Science and Engineering Beijing University of Chemical Technology Beijing100029 China

Effects of framework and Si/Al of Pt/zeolites on CO catalytic oxidation were investigated. CO conversion increased with decreasing pore size and increasing Si/Al. The optimized Pt/CHA with Si/Al of 17 showed the highest activity, achieving complete CO conversion below 140 °C. The large CHA cavity plays important role, which lead to higher CO conversion of Pt/CHA than Pt/BEA and Pt/MFI zeolites. Increasing Si/Al favors the presence of Pt0, which showed excellent CO catalytic oxidation ability. The framework with high Si/Al protected Pt0 from accumulating and dealumination during hydrothermal aging, resulting in high hydrothermal stability. © 2023, The Authors. All rights reserved.

关键词： Zeolites

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Research on the design of smart morphing long-endurance UAVs

Research on the design of smart morphing long-endurance UAVs

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作者： Ma, T. Liu, Y. Yang, D. Zhang, Z. Wang, X. Hao, S. Beijing Advanced Subject Center of Advanced Unmanned Aerial Vehicles Key Laboratory of Advanced Technology of Intelligent Unmanned Flight System Ministry of Industry and Information Technology Institute of Unmanned System Beihang University Beijing China School of Aeronautic Science and Engineering Beihang University Beijing China SATM Cranfield University Cranfield United Kingdom School of Aeronautic Science and Engineering Beihang University Beijing China School of Aeronautic Science and Engineering Hiwing General Aviation Equipment Co. LTD Beihang University Beijing China

To improve the endurance performance of long-endurance Unmanned Aerial Vehicles (UAVs), a smart morphing method to adjust the UAV and flight mode continuously during flight is proposed. Using this method as a starting point, a smart morphing long-endurance UAV design is conducted and the resulting improvement in the endurance performance studied. Firstly, the initial overall design of the smart morphing long-endurance UAV is carried out, then the morphing form is designed and various control parameters are selected. Secondly, based on multi-agent theory, an architecture for the smart morphing control system is built and the workflow of the smart morphing control system is planned. The morphing decision method is designed in detail based on the particle swarm optimisation algorithm. Finally, a simulation of the smart morphing approach in the climb and cruise stages is carried out to quantitatively verify the improvement in the endurance performance. The simulation results show that the smart morphing method can improve the cruise time by 4.1% with the same fuel consumption. ©

关键词： Antennas

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Embedded skyrmion bags in thin films of chiral magnets

arXiv

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arXiv 2024年

作者： Yang, Luyan Savchenko, Andrii S. Zheng, Fengshan Kiselev, Nikolai S. Rybakov, Filipp N. Han, Xiaodong Blügel, Stefan Dunin-Borkowski, Rafal E. Beijing Key Laboratory of Microstructure and Property of Advanced Materials College of Materials Science and Engineering Beijing University of Technology Beijing100124 China Ernst Ruska-Centre for Microscopy and Spectroscopy with Electrons Peter Grünberg Institute Forschungszentrum Jülich Jülich52425 Germany Peter Grünberg Institute Institute for Advanced Simulation Forschungszentrum Jülich JARA Jülich52425 Germany Spin-X Institute Center for Electron Microscopy School of Physics and Optoelectronics State Key Laboratory of Luminescent Materials and Devices Guangdong-Hong Kong-Macao Joint Laboratory of Optoelectronic and Magnetic Functional Materials South China University of Technology Guangzhou511442 China Department of Physics and Astronomy Uppsala University Box-516 UppsalaSE-751 20 Sweden Department of Materials Science and Engineering Southern University of Science and Technology Shenzhen518055 China

Magnetic skyrmions are topologically nontrivial spin configurations that possess particle-like properties. Earlier research was mainly focused on a specific type of skyrmion with topological charge Q = −1. However, theoretical analyses of two-dimensional chiral magnets have predicted the existence of skyrmion bags – solitons with arbitrary positive or negative topological charge. Although such spin textures are metastable states, recent experimental observations have confirmed the stability of isolated skyrmion bags in a limited range of applied magnetic fields. Here, by utilizing Lorentz transmission electron microscopy, we show the extraordinary stability of skyrmion bags in thin plates of B20-type FeGe. In particular, we show that skyrmion bags embedded within a skyrmion lattice remain stable even in zero or inverted external magnetic fields. A robust protocol for nucleating such embedded skyrmion bags is provided. Our results agree perfectly with micromagnetic simulations and establish thin plates of cubic chiral magnets as a powerful platform for exploring a broad spectrum of topological magnetic solitons. © 2024, CC BY-NC-ND.

关键词： Solitons

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