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Information Communication Technologies Conference (ICTC)

作者： Benchu Zhang Zaiyue Yang School of System Design and Intelligent Manufacturing Southern University of Science and Technology Shenzhen China Shenzhen Key Laboratory of Control Theory and Intelligent Systems and the School of System Design and Intelligent Manufacturing Southern University of Science and Technology Shenzhen China

ISBN: (数字)9798350373523

ISBN: (纸本)9798350373530

Since the Low Earth Orbit (LEO) satellite communication system has the advantages of low latency, global coverage, and rapid reconstruction, it has become the main networking method of satellite networks [1]. Routing is the basis for realizing satellite communications. Because the complexity of the shortest path algorithm basically determines the computational complexity of the routing algorithm, the shortest path algorithm is the core of the routing problem. This paper attempts to use the laws of LEO satellite network topology to calculate the shortest path between the source satellite and the destination satellite. First, we derive the function of inter-satellite link (ISL) length with time and establish the geometric model of the satellite network. Then, on the basis of this model, we establish the shortest path algorithm between source-destination pairs (SD pairs) - the symmetric geometry algorithm (SGA). In addition, in order to ensure the optimality of the path, we extend the applicable scene of the model from the two-dimensional plane to the three-dimensional sphere. The simulation test results show that compared with the traditional Dijkstra’s algorithm, SGA can greatly improve the calculation speed of the shortest path while ensuring the optimality of the path.

关键词： Geometry Solid modeling Satellites Network topology Geometric modeling Low earth orbit satellites Routing

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Increasing high-temperature fatigue resistance of polysynthetic twinned TiAl single crystal by plastic strain delocalization

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Journal of Materials science & technology 2021年第34期93卷 53-59页

作者： Yang Chen Yuede Cao Zhixiang Qi Guang Chen MIT Key Laboratory of Advanced Metallic and Itermetalic Materials Techmology Engineering Research Center of Materials Behavior and Design Ministry of EducotionNanjing University of Science and TechnologyNanjing 210094Chind

Polysynthetic twinned(PST)TiAl single crystal possesses great potentials for high-temperature applications due to its excellent combination of strength,ductility and creep ***,a critical property for high-temperature application of such material involving high-temperature fatigue properties remains ***,the high-temperature high-cycle fatigue performance of PST TiAl single crystal has been *** result shows that PST TiAl single crystal can withstand more than 107 cyclic loadings at 975℃ under a stress amplitude of 270 MPa,which is significantly higher than traditional TiAl *** observations and atomistic simulations indicate that the improvement of fatigue resistance is attributed to the plastic strain delocalization in uniform lamellar structure,and the plastic deformation is well-distributed and sufficient in each *** in theα2 lamella with difficult slippage,a large number of stacking fault structures can be ***{c+a}dislocations inα2 tend to dissociate into a Frank partial with b=1/6<2^(-)20^(-)3>,forming a ribbon of I1 fault which ensures the continuity of deformation.

关键词： TiAl Single crystal Fatigue High temperature Strain delocalization

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Structural design, Analysis of Large-Area Flexible Solar Array for Space Solar Power Station 1

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23rd IFToMM China International Conference on Mechanism and Machine science and Engineering, IFToMM CCMMS 2022

作者： Qin, Li Fu, Yulei Xie, Chao Wei, Xiao Yan, Biao Cheng, Zhengai Yin, Hanfeng Shanghai Institute of Aerospace System Engineering Shanghai201109 China Shanghai Institute of Satellite Equipment Shanghai200240 China Space Structure and Mechanism Technology Laboratory of China Aerospace Science and Technology Group Co. Ltd. Shanghai201109 China Qian Xuesen Laboratory of Space Technology Beijing100094 China State Key Laboratory of Advanced Design and Manufacturing for Vehicle Body Hunan University Hunan Changsha410082 China

ISBN: (数字)9789811993985

ISBN: (纸本)9789811993978

Large-area flexible roll-out solar array system has huge application potential in space structure especially for the Space Solar Power System (SSPS) due to the advantages of the lightweight, high area to mass ratio, excellent folding and deployable capabilities. For SSPS to operate economically, solar array system must operate at power levels greater than MW, while the commercial SSPS should operate at power levels no less than GW. Therefore, advanced flexible solar array systems with areas up to 104 m2 and 107 m2 are essential. In this study, a modular large-area flexible roll-out solar array system with several subarrays is proposed, in which Composite lenticular boom is used as the load-carrying structure, and inflation constrained with Velcros is designed as the drive mechanism. The single array can be expanded to more than 1000 m2, while the specific power is expected to reach more than 500 W/kg. In this paper, structural dynamics, inflation deployment dynamics and on-orbit thermal performances of the subarray are analyzed, the result show that the proposed solar array system is reasonable and feasible for SSPS application. © 2023, The Author(s), under exclusive license to Springer Nature Singapore Pte Ltd.

关键词： Structural dynamics

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Nonvolatile anomalous Nernst effect in Mn5Si3 with a collinear Néel vector

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Physical Review Applied 2025年第4期23卷 044066-044066页

作者： L. Han X.Z. Fu W.Q. He J.K. Dai Y.X. Zhu W.F. Yang Y.L. Chen J.C. Zhang W.X. Zhu H. Bai C. Chen D.Z. Hou C.H. Wan X.F. Han C. Song J.W. Liu F. Pan Key Laboratory of Advanced Materials School of Materials Science and Engineering Tsinghua University Beijing 100084 China Department of Physics The Hong Kong University of Science and Technology Hong Kong 999077 China Beijing National Laboratory for Condensed Matter Physics Institute of Physics Chinese Academy of Sciences Beijing 100190 China International Center for Quantum Design of Functional Materials (ICQD) School of Emerging Technology University of Science and Technology of China Hefei 230026 China

For magnetic-resistant and ultrafast transverse thermoelectric converters, antiferromagnets with a collinear Néel vector have unique advantages but their anomalous Nernst effect (ANE), as the fundamental requirement, remains unachieved due to the spin-degenerated bands. Here, we realize the nonvolatile ANE in an altermagnet from Mn5Si3 thin films with a collinear Néel vector under strain, where the Berry curvature from the intersections of spin-splitting bands (instead of a tiny net moment) determines the anomalous Nernst conductivity. The ANE undergoes a sixfold enhancement via doping, most likely due to the raised Fermi level. Order parameter fluctuations induce unique temperature dependence, which also applies to other suitable altermagnets. Our work not only fills a longstanding gap by observing the nonvolatile ANE in material with a collinear Néel vector but also enlightens thermoelectric physics related to spin-splitting bands.

关键词： Thermoelectricity

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Regeneration and anti-migration of sand waves associated with sand mining in the Taiwan Shoal

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Acta Oceanologica Sinica 2023年第9期42卷 71-78页

作者： Jingjing Bao Feng Cai Chengqiang Wu Huiquan Lu Yongling Zheng Yufeng Li Li Sun Chungeng Liu Yongbao Li Laboratory of Ocean and Coast Geology Third Institute of OceanographyMinistry of Natural ResourcesXiamen 361005China Fujian Provincial Key Laboratory of Marine Physical and Geological Processes Xiamen 361005China Fujian Provincial Key Laboratory of Marine Ecological Protection and Restoration Xiamen 361005China Xiamen Ocean Engineering Exploration and Design Institute Co.Ltd. Xiamen 361005China School of Environment and Resource Southwest University of Science and TechnologyMianyang 621010China

Sand waves in the Taiwan Shoal are characterized by two distinct spatial scales. Giant sand waves have a length of2 kilometers with height between 5 m and 25 m, whilst small sand waves is less than 100-m long with height less than 5 m between giant sand wave peaks(crests). A series of five high-resolution multi-beam echo-sounding surveys between 2012 and 2020 in the middle of Taiwan Shoal indicated that artificial dredging on the giant sand waves had caused sand wave reform and evolution. Overall, the removal of giant sand waves significantly affected the migration of small sand waves adjacent to the dredging site, with the latter on both sides of the former appear to migrate towards the dredging pit. Moreover, in the dredging area, new sand waves emerged with wavelength much smaller than the original giant sand waves, while the convergent pattern of the small sand waves tends to store and form the giant sand waves, which might spread far beyond the survey period.

关键词： small sand wave giant sand wave anti-migration regrowing sand mining Taiwan Shoal

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The innovative safe herbicide dienediamine saves paraquat

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Molecular Plant 2024年第1期17卷 11-12页

作者： Jin-Qiu Xia Ping Xu Cheng-Bin Xiang Division of Life Sciences and Medicine Division of Molecular&Cell BiophysicsHefei National Science Center for Physical Sciences at the MicroscaleMOE Key Laboratory for Membraneless Organelles and Cellular DynamicsUniversity of Science and Technology of ChinaThe Innovation Academy of Seed DesignChinese Academy of SciencesHefeiAnhui Province 230027China Shanghai Key Laboratory of Plant Functional Genomics and Resources Shanghai Chenshan Botanical GardenShanghai Chenshan Plant Science Research CenterCAS Center for Excellence in Molecular Plant SciencesShanghai 201602China

Throughout the history of agriculture,the challenge of weed management has endured,necessitating significant investments to facilitate ideal crop growth and maximize *** for weed control mainly involve manual and chem... 详细信息

关键词： approach. manual chemical

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Multi-stage anisotropic etching of two-dimensional heterostructures

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Nano Research 2022年第6期15卷 4909-4915页

作者： Lin Li Jichen Dong Dechao Geng Menghan Li Wei Fu Feng Ding Wenping Hu Hui Ying Yang Institute of Molecular Plus Tianjin UniversityTianjin 300072China Centre for Multidimensional Carbon Materials Institute for Basic ScienceUlsan 44919Republic of Korea Pillar of Engineering Product Development Singapore University of Technology and DesignSingapore 487372Singapore Tianjin Key Laboratory of Molecular Optoelectronic Sciences Department of ChemistrySchool of ScienceTianjin University and Collaborative Innovation Center of Chemical Science and EngineeringTianjin 300072China Institute of Materials Research and Engineering(IMRE) Agency for ScienceTechnologyand Research(A*STAR)Singapore 138634Singapore

Regarding the reverse process of materials growth,etching has been widely concerned to indirectly probe the growth kinetics,offering an avenue in governing the growth of two-dimensional(2D)*** this work,interface-driven anisotropic etching mode is demonstrated for the first time to be generally applied to 2D *** is shown that the typical in-plane graphene and hexagonal boron nitride(h-BN)heterostructures follow a multi-stage etching behavior initiated first along the interfacial region between the two materials and then along edges of neighboring h-BN flakes and finally along central edges of *** accurately tuning etching conditions in the chemical vapor deposition process,series of etched 2D heterostructure patterns are controllably ***,scaled formation of graphene and h-BN heterostructures arrays has been realized with full assist of as-proposed etching mechanism,offering a direct top-down method to make 2D orientated heterostructures with order and *** of interface-driven multi-staged anisotropic etching mode will shed light on understanding growth mechanism and further expanding wide applications of 2D heterostructures.

关键词： anisotropic etching two-dimensional materials heterostructures graphene h-BN

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Hard-magnetic liquid metal droplets with excellent magnetic field dependent mobility and elasticity

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Journal of Materials science & technology 2021年第33期92卷 60-68页

作者： Xiaokang He Mingyang Ni Jianpeng Wu Shouhu Xuan Xinglong Gong CAS Key Laboratory of Mechanical Behavior and Design of Materials Department of Modern MechanicsCAS Center for Excellence in Complex System MechanicsUniversity of Science and Technology of ChinaHefei 230027China

Magnetic liquid metal droplets(MLMDs)have been proven to be very important in many fields such as flexible electronics and soft ***,soft magnetic particles such as nickel(Ni)and iron(Fe)are mixed or suspended into the liquid metal to obtain soft MLMDs(S-LMDs),which can be easily manipulated under the magnetic field due to the favorable deformability and *** addition,hard magnetic particles such as neodymium iron boron(Nd Fe B)with a high residual magnetization can also be dispersed into the liquid metal and the hard MLMDs(H-LMDs)become more compact due to the interaction between internal particles induced by *** work reports a kind of H-LMDs with high surface tension,high flexibility and mechanical robustness,whose electrical conductivity and strength are better than the *** the magnetic field,the H-LMDs have a faster response time(0.58 s)and a larger actuating velocity(4.45 cm/s)than the ***,the H-LMDs show excellent magnetic controllability,good elasticity and favorable mobility,as demonstrated by magnetically actuated locomotion,bounce tests and rolling angle ***,the droplets can be further applied in wheeldriven motors and micro-valve switches,which demonstrates their high application potential in robotic manipulation and microfluidic devices.

关键词： Magnetic liquid metal droplets NdFeB particles Magnetic controllability Micro-valve

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Convergence of Bregman Peaceman–Rachford Splitting Method for Nonconvex Nonseparable Optimization

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Journal of the Operations Research Society of China 2023年第4期11卷 707-733页

作者： Peng-Jie Liu Jin-Bao Jian Bo He Xian-Zhen Jiang College of Mathematics and Physics Guangxi Key Laboratory of Hybrid Computation and IC Design AnalysisCenter for Applied Mathematics and Artificial IntelligenceGuangxi University for NationalitiesNanning530006GuangxiChina College of Mathematics and Information Science Guangxi UniversityNanning530004GuangxiChina School of Mathematics China University of Mining and TechnologyXuzhou221116JiangsuChina

This work is about a splitting method for solving a nonconvex nonseparable optimization problem with linear constraints,where the objective function consists of two separable functions and a coupled ***,based on the ideas from Bregman distance and Peaceman–Rachford splitting method,the Bregman Peaceman–Rachford splitting method with different relaxation factors for the multiplier is ***,the global and strong convergence of the proposed algorithm are proved under general conditions including the region of the two relaxation factors as well as the crucial Kurdyka–Łojasiewicz ***,when the associated Kurdyka–Łojasiewicz property function has a special structure,the sublinear and linear convergence rates of the proposed algorithm are ***,some preliminary numerical results are shown to indicate the effectiveness of the proposed algorithm.

关键词： Nonconvex nonseparable optimization Peaceman-Rachford splitting method Bregman distance Kurdyka-Łojasiewicz inequality Convergence rate

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Defect and Doping Co‑Engineered Non‑Metal Nanocarbon ORR Electrocatalyst

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Nano-Micro Letters 2021年第4期13卷 178-207页

作者： Jian Zhang Jingjing Zhang Feng He Yijun Chen Jiawei Zhu Deli Wang Shichun Mu Hui Ying Yang Key Laboratory of Material Chemistry for Energy Conversion and Storage Ministry of EducationSchool of Chemistry and Chemical EngineeringHuazhong University of Science and TechnologyWuhan 430074People’s Republic of China Pillar of Engineering Product Development Singapore University of Technology and Design8 Somapah RoadSingapore 487372Singapore State Key Laboratory of Advanced Technology for Materials Synthesis and Processing Wuhan University of TechnologyWuhan 430070People’s Republic of China Foshan Xianhu Laboratory of the Advanced Energy Science and Technology Guangdong Laboratory Xianhu Hydrogen ValleyFoshan 528200People’s Republic of China

Exploring low-cost and earth-abundant oxygen reduction reaction(ORR)electrocatalyst is essential for fuel cells and metal–air *** them,non-metal nanocarbon with multiple advantages of low cost,abundance,high conductivity,good durability,and competitive activity has attracted intense interest in recent *** enhanced ORR activities of the nanocarbons are normally thought to originate from heteroatom(e.g.,N,B,P,or S)doping or various induced ***,in practice,carbon-based materials usually contain both dopants and *** this regard,in terms of the co-engineering of heteroatom doping and defect inducing,we present an overview of recent advances in developing non-metal carbon-based electrocatalysts for the *** characteristics,ORR performance,and the related mechanism of these functionalized nanocarbons by heteroatom doping,defect inducing,and in particular their synergistic promotion effect are emphatically analyzed and ***,the current issues and perspectives in developing carbon-based electrocatalysts from both of heteroatom doping and defect engineering are *** review will be beneficial for the rational design and manufacturing of highly efficient carbon-based materials for electrocatalysis.

关键词： Defect Doping Electrocatalyst Oxygen reduction reaction Non-metal nanocarbon

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