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Analysis of identification methods of key nodes in transportation network

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Chinese Physics B 2022年第6期31卷 782-789页

作者： qiang lai Hong-Hao Zhang School of Electrical and Automation Engineering East China Jiaotong UniversityNanchang 330013China

The identification of key nodes plays an important role in improving the robustness of the transportation *** different types of transportation networks,the effect of the same identification method may be *** is of practical significance to study the key nodes identification methods corresponding to various types of transportation *** on the knowledge of complex networks,the metro networks and the bus networks are selected as the objects,and the key nodes are identified by the node degree identification method,the neighbor node degree identification method,the weighted k-shell degree neighborhood identification method(KSD),the degree k-shell identification method(DKS),and the degree k-shell neighborhood identification method(DKSN).Take the network efficiency and the largest connected subgraph as the effective *** results show that the KSD identification method that comprehensively considers the elements has the best recognition effect and has certain practical significance.

关键词： transportation network key node identification KSD identification method network efficiency

Non-uniform shrinkage analysis of round billet using element-free Galerkin method

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Journal of Iron and Steel Research International 2022年第1期29卷 80-87页

作者： lai-qiang Cai Xu-dong Wang Man Yao School of Materials Science and Engineering Dalian University of TechnologyDalian 116024LiaoningChina Key Laboratory of Solidification Control and Digital Preparation Technology(Liaoning Province) Dalian University of TechnologyDalian 116024LiaoningChina

An element-free Galerkin thermal–mechanical calculation model for the solidification and shrinkage of round billet was *** non-uniform heat flux measured in the plant trial was used as the boundary condition to simulate and analyze the deformation of solidified *** results indicate that the maximum and minimum shrinkages of the round billet at mold outlet are 0.78 and 0.21 mm,respectively,with apparent non-uniform *** local high-heat-flux region substantially dominates the non-uniformity of shell shrinkage,and the larger shrinkage usually derives from the high heat flux between the solidified shell and the mold in the circumferential ***,the shrinkage on the shell surface has an immediate connection with the equivalent ***,the shrinkage is more closely related to the radial stress component than the circumferential stress component.

关键词： Non-uniform shrinkage Round billet Element-free Galerkin method Thermal-mechanical model

Effects of Sm content on crystallized structure and magnetic properties of Co80-xSmxb20 amorphous alloys

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Journal of Iron and Steel Research International 2020年第4期27卷 471-476页

作者： Lei-qiang lai Yan-hui Li Feng Bao Wei Zhang Key Laboratory of Materials Modification by Laser Ionand Electron Beams(Ministry of Education)School of Materials Science and EngineeringDalian University of TechnologyDalian 116024LiaoningChina

The formation,thermal stability,crystallized structure,and magnetic properties of melt-spun Co80-xSmxB20(x=0–20)amorphous alloys have been investigated.A single amorphous phase is formed for the alloys with x=0–*** first crystallization temperature gradually increases from 670 to 955 K as x increases from 0 to 10,and decreases to 836K when x=*** optimum annealing,the nanocomposite structure consisting of SmCo12B6+fcc-Co+Sm2Co17 phases is formed for the alloys with x=5 and 7.5,and SmCo12B6+Sm2Co17+SmCo3,SmCo12B6+Sm2Co17+SmCo4B,and SmCo12B6+SmCo4B phases are formed for the alloys with x=10,12.5,and 15,*** coercivity of the annealed alloys increases remarkably from 103.5 to 1249.4 kA m^-1 as x increases from 5 to 15,while the magnetization at the applied field of 2.0T decreases from 0.51 to *** improved magnetic hardness with rising Sm content is attributed to the formation of the hard magnetic phases with higher magnetocrystalline anisotropy and the increase in their volume fraction.

关键词： Co-Sm-B alloy Melt-spun Amorphous alloy Crystallized structure Magnetic property

Mechanical property of cylindrical sandwich shell with gradient core of entangled wire mesh

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Defence Technology（防务技术） 2024年第1期31卷 510-522页

作者： Xin Xue Chao Zheng Fu-qiang lai Xue-qian Wu Institute of Metal-rubber&Vibration Noise School of Mechanical Engineering and AutomationFuzhou UniversityFuzhou350116China Fujian Metallurgical Industry Design Institute Fuzhou350116China

To explore the wide-frequency damping and vibration-attenuation performances in the application of aerospace components,the cylindrical sandwich shell structure with a gradient core of entangled wire mesh was proposed in this ***,the gradient cores of entangled wire mesh in the axial and radial directions were prepared by using an in-house Numerical Control weaving machine,and the metallurgical connection between skin sheets and the gradient core was performed using vacuum ***,to investigate the mechanical properties of cylindrical sandwich shells with axial or radial gradient cores,quasi-static and dynamic mechanical experiments were carried *** primary evaluations of mechanical properties include secant stiffness,natural frequency,Specific Energy Absorption(SEA),vibration acceleration level,and so *** results suggest that the vibration-attenuation performance of the sandwich shell is remarkable when the high-density core layer is at the end of the shell or abuts the inner *** axial gradient material has almost no influence on the vibration frequencies of the shell,whereas the vibration frequencies increase dramatically when the high-density core layer approaches the ***,compared to the conventional sandwich shells,the proposed functional grading cylindrical sandwich shell exhibits more potential in mass reduction,stiffness designing,and energy dissipation.

关键词： Entangled wire mesh Gradient cylindrical sandwich shell Vacuum brazing Secant stiffness Damping

Synthesis and Crystal Structure of a Co(II) Complex with Schiff Base and Imidazole Ligand

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Chinese Journal of Structural Chemistry 2006年第5期25卷 567-571页

作者： WU Lian-Bin HU Zi-qiang lai Guo-Qiao Key Laboratory of Organosilicon Chemistry and Material Technology of Education Ministry Hangzhou Teachers University Hangzhou 310012 China

The title compound, [Co（C3H4N2）2（C22H18N2O4）]·5H2O （Mr = 659.56）, has been prepared and its crystal structure was determined by X-ray diffraction method. The crystal belongs to monoclinic, space group P21/n, a = 9.6808（2）, b = 26.7204（5）, c = 12.7993（3） A, β = 100.9340（10）°, V= 3250.75（12） A^3, Z = 4, Dc = 1.348 g/cm^3,μ = 0.586 mm^-1, F（000） = 1380, S = 1.131, R = 0.0689 and wR = 0.1883 for 4782 observed reflections （Ⅰ 〉 2σ（Ⅰ））. The title crystal consists of Co（Ⅱ） complex and lattice water molecules. The Co（Ⅱ） complex assumes a distorted octahedral coordination geometry, formed by one Schiff base dianion phenylenediamine-3-methoxysali-cylaldehyde and two imidazole ligands. The π-π stacking interaction occurs between nearly parallel benzene rings of the neighboring complexes.

关键词： cobalt(Ⅱ) complex Schiff base crystal structure π-π stacking

RNA Methylation m6A:A New Code and Drug Target?

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Chinese Journal of Chemistry 2020年第4期38卷 420-421页

作者： Gan-qiang lai Lin-Lin Zhou Cai-Guang Yang State Key Laboratory of Drug Research Shanghai Institute of Materia MedicoChinese Academy of SciencesShanghai 201203China University of the Chinese Academy of Sciences Beijing 100049China

The m^6A-RNA modification is a dynamic and reversible process,which has emerged as a new RNA code for the regulation of gene *** functional network of methyltransferases(writers),demethylases(erasers),and binding proteins(readers)modulate the level of m^6A *** of RNA methylation has been associated with various fundamental biological processes and human ***,we briefly introduce an understanding-enabled manipulation on m^6A RNA modification with an emphasis on the use of small-molecule intervention.

关键词： expression. manipulation modification

Sliding-mode-based preassigned-time control of a class of memristor chaotic systems

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Chinese Physics B 2024年第11期33卷 161-166页

作者： Jinrong Fan qiang lai Qiming Wang Leimin Wang College of Computer Science South-Central Minzu UniversityWuhan 430074China School of Electrical and Automation Engineering East China Jiaotong UniversityNanchang 330013China School of Automation China University of GeosciencesWuhan 430074China

This paper addresses the preassigned-time chaos control problem of memristor chaotic systems with time *** the introduction of memristor,the presented models are nonlinear systems with chaotic ***,the TS fuzzy method is adopted to describe the chaotic ***,a sliding-model-based control approach is proposed to achieve the preassigned-time stabilization of the presented models,where the upper bound of stabilization time can be arbitrarily specified in ***,simulation results demonstrate the validity of presented control approach and theoretic results.

关键词： memristor chaotic system TS fuzzy method preassigned-time stabilization sliding-mode control

Wear Behavior and Mechanism of a Sliding Pair of 0.1C-3Cr-2W-V Nitrided Steel Rubbing against an Aluminum Bronze Alloy

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Journal of Iron and Steel Research International 2016年第3期23卷 281-288页

作者： Guang-hong WANG Sheng-guan QU Zhi-hua XIONG Fu-qiang lai Xiao-qiang LI Mao-sheng YANG School of Mechanical and Automotive Engineering South China University of Technology Institute of Special Steel Central Iron and Steel Research Institute

Wear behavior and mechanism of plasma nitrided steel oscillating against a heat-treated and an untreated aluminum bronze alloy were investigated using an Optimol SRV *** influence of heat treatment on the mechanical properties of the alloy was ***,the wear debris was also examined to understand the wear *** results show that a 220-230μm nitrided layer,which was harder than the substrate,was obtained on the steel *** tensile strength and hardness of the alloy are found to be significantly improved by the heat treatment associated with low impact *** heat treatment of the alloy did not obviously decrease the friction coefficient of the nitrided steel-bronze ***,the wear loss of the nitrided steel increased when it mated with the treated bronze by a severe three-body *** nitrided steel was mainly damaged by fatigue *** plane contact conditions,the wear debris was mainly generated from the bronze part and can escape from the interface before being oxidized,leading to the phase structure of all the debris being copper rather than copper oxides.

关键词： steel plasma nitriding aluminum bronze sliding wear three-body abrasion

Bipolar-growth multi-wing attractors and diverse coexisting attractors in a new memristive chaotic system

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Chinese Physics B 2023年第10期32卷 310-316页

作者：黄旺鹏赖强 School of Tian You East China Jiaotong UniversityNanchang 330013China School of Electrical and Automation Engineering East China Jiaotong UniversityNanchang 330013China

This article proposes a non-ideal flux-controlled memristor with a bisymmetric sawtooth piecewise function, and a new multi-wing memristive chaotic system(MMCS) based on the memristor is generated. Compared with other existing MMCSs, the most eye-catching point of the proposed MMCS is that the amplitude of the wing will enlarge towards the poles as the number of wings increases. Diverse coexisting attractors are numerically found in the MMCS, including chaos,quasi-period, and stable point. The circuits of the proposed memristor and MMCS are designed and the obtained results demonstrate their validity and reliability.

关键词： chaos memristive chaotic system multi-wing attractors coexisting attractors