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Long-term corrosion evolution associated with the structural heterogeneities of an Fe-based amorphous coating in H_(3)BO_(3)solution at various temperatures

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journal of Materials Science & Technology 2023年第9期140卷 233-248页

作者： D.B.Wang j.Wu j.P.Cui q.Wang T.R.Li W.Emori S.D.Zhang j.q.Wang Shenyang National Laboratory for Materials Science Institute of Metal ResearchCASShenyang110016China School of Materials Science and Engineering University of Science and Technology of ChinaShenyang110016China Key Laboratory of Biorheological Science and Technology Ministry of EducationCollege of BioengineeringChongqing UniversityChongqing400044China School of Materials Science and Engineering Sichuan University of Science and EngineeringZigong 643000SichuanChina

Understanding the long-term corrosion behavior of neutron absorber materials in H_(3)BO_(3)solution is crucial for the materials applications in spent fuel *** this paper,long-term corrosion evolution for 180 d in relation to the structural heterogeneities of an Fe-based amorphous coating(AMC)in H_(3)BO_(3)solution at various temperatures was systematically *** indicate that the coating corrosion could be divided into three distinct ***,the corrosion resistance increased owing to the thickening and composition evolution of the passive ***,the corrosion rate was kept almost constant in the second stage,which connected with the steady state of the passive ***,the corrosion resistance of coating reduced gradually owing to the initiation and penetration of local-ized ***,it was revealed that the localized corrosion was initiated at the relatively Cr-depleted amorphous matrix in the deep pores of the *** could be attributed to the synergy of Cr-depletion and occlusive effect in the deep pores during long-term *** the elevation of temperature,the localized corrosion was enhanced due to the accumulation of the H+in the pores to swiftly reach the critical conditions for passive film *** work provides insights into the long-term corrosion mechanism of Fe-based AMCs in H_(3)BO_(3)solution and offers meaningful contributions to the design of new corrosion resistant neutron absorbing coatings for spent fuel storage applications.

关键词： AMC Boric acid EIS Long-term corrosion Temperature

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Basic features of the multiscale interaction between tearing modes and slab ion-temperature-gradient modes

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Chinese Physics B 2019年第12期28卷 237-247页

作者： L Wei Z X Wang j q Li Z q Hu Y Kishimoto Key Laboratory of Materials Modification by Laser Ionand Electron Beams(Ministry of Education)School of PhysicsDalian University of TechnologyDalian 116024China Southwestern Institute of Physics Chengdu 610041China Graduate School of Energy Science Kyoto UniversityGokashoUjiKyoto 1-0011Japan

Nonlinear interaction between tearing modes(TM) and slab ion-temperature-gradient(ITG) modes is numerically investigated by using a Landau fluid model. It is observed that the energy spectra with respect to wavenumbers become broader during the transition phase from the ITG-dominated stage to TM-dominated stage. Accompanied with the fast growth of the magnetic island, the frequency of TM/ITG with long/short wavelength fluctuations in the electron/ion diamagnetic direction decreases/increases respectively. The decrease of TM frequency is identified to result from the effect of the profile flattening in the vicinity of the magnetic island, while the increase of the frequencies of ITG fluctuations is due to the eigenmode transition of ITG induced by the large scale zonal flow and zonal current related to TM. Roles of zonal current induced by the ITG fluctuations in the instability of TM are also analyzed. Finally, the electromagnetic transport features in the vicinity of the magnetic island are discussed.

关键词： magnetic reconnection tearing modes magnetohydrodynamics drift waves nonlinear phenomena

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Effect of Base Material on Microstructure and Texture Evolution of a Ti–6Al–4V Electron-Beam Welded joint

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Acta Metallurgica Sinica(English Letters) 2017年第5期30卷 499-504页

作者： G.q.Wang Z.B.Zhao B.B.Yu j.R.Liu q.j.Wang j.H.Zhang R.Yang j.W.Li School of Materials Science and Engineering University of Science and Technology of China Institute of Metal Research Chinese Academy of Sciences Science and Technology on Power Beam Processes Laboratory Beijing Aeronautical Manufacturing Technology Research Institute

The effect of base material（BM） on microstructure and crystallographic orientation evolution of a Ti–6Al–4V electron-beam welded joint was investigated. Meanwhile, the crystallographic orientation of prior b grains was studied by advanced electron backscattered diffraction data processing. The inhomogeneity of microstructure within welded joint was formed due to the different microstructures of BM. By comparing microstructure details of the welded joint, including microstructure morphology and crystallographic orientation with those of the base material, it can be found that both the microstructure morphology and crystallographic orientation of the EBW joint would be controlled by BM.

关键词： Electron-beam welding Titanium alloys Prior b orientation Microstructure Texture

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智慧医疗情境下四方主体隐私行为的交互机理及演化趋势研究

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现代情报 2025年第1期45卷 135-149页

作者：朱光吴晗逸刘雯南京信息工程大学风险治理与应急决策研究院江苏南京210044 南京信息工程大学管理工程学院江苏南京210044

[目的/意义]本文针对智慧医疗情境下隐私行为研究在博弈主体、模型参数等方面的不足,探寻患者、医疗机构、智慧医疗平台和政府四方主体之间的隐私行为交互机理与演化趋势。[方法/过程]基于演化博弈理论,构建患者、医疗机构、智慧医疗平... 详细信息

[目的/意义]本文针对智慧医疗情境下隐私行为研究在博弈主体、模型参数等方面的不足,探寻患者、医疗机构、智慧医疗平台和政府四方主体之间的隐私行为交互机理与演化趋势。[方法/过程]基于演化博弈理论,构建患者、医疗机构、智慧医疗平台和政府四方博弈模型。根据不同参数调节下各方行为策略的收益、成本、损失等计算收益矩阵,求解主体的演化稳定策略,并考虑不同因素对主体行为策略及系统稳定状态的影响。[结果/结论]患者的隐私披露行为与披露隐私后获得的服务收益密切相关,医疗机构的隐私保护投入成本和隐私泄露概率对其隐私保护行为有显著影响,智慧医疗平台的政府奖惩、罚款收益和投入成本是影响其严格管理行为的关键因素,政府的监管行为与奖惩机制等因素密切相关。通过应用本文模型和方法,可以动态调整隐私保护机制,明确各方职责,推动智慧医疗可持续健康发展。

关键词：智慧医疗演化博弈隐私行为患者医疗机构智慧医疗平台政府

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Rational design of chemically complex metallic glasses by hybrid modeling guided machine learning

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npj Computational Materials 2021年第1期7卷 1242-1251页

作者： Z.q.Zhou q.F.He X.D.Liu q.Wang j.H.Luan C.T.Liu Y.Yang Department of Mechanical Engineering College of EngineeringCity University of Hong KongKowloonHong KongChina College of Mechatronics and Control Engineering Shenzhen UniversityShenzhenChina Laboratory for Structures Institute of Materials ScienceShanghai UniversityShanghaiChina Department of Materials Science and Engineering College of EngineeringCity University of Hong KongKowloonHong KongChina Department of Advanced Design and System Engineering College of EngineeringCity University of Hong KongChina

The compositional design of metallic glasses(MGs)is a long-standing issue in materials science and ***,traditional experimental approaches based on empirical rules are time consuming with a low *** this work,we successfully developed a hybrid machine learning(ML)model to address this fundamental issue based on a database containing~5000 different compositions of metallic glasses(either bulk or ribbon)reported since *** the prior works relying on empirical parameters for featurization of data,we designed modeling guided data descriptors in line with the recent theoretical models on amorphization in chemically complex alloys for the development of the hybrid classification-regression ML *** hybrid ML modeling was validated both numerically and *** importantly,it enabled the discovery of MGs(either bulk or ribbon)through the ML-aided deep search of a multitude of quaternary to scenery alloy *** computational framework herein established is expected to accelerate the design of MG compositions and expand their applications by probing the complex and multi-dimensional compositional space that has never been explored before.

关键词： alloy glasses metallic

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Fluid-structure interaction in Z-shaped pipe with different supports

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Acta Mechanica Sinica 2020年第2期36卷 513-523页

作者： q.Guo j.X.Zhou X.L.Guan College of Water Conservancy and Hydropower Engineering Hohai UniversityNanjing 210098China Highway Science and Technology Research Institute Xinjiang Production and Construction Corpsürümqi 830002China

Fluid-structure interaction(FSI)has a strong relation with layout of fluid delivery *** is liable to cause local ***,FSI analysis is necessary in many cases,especially for flexible pipe *** modeling consists of eight governing equations and then completely solved via the finite volume method(FVM).Friction,Poisson and joint couplings were discussed in detail to reveal the influence of a Z-shaped pipe with different supports and elbows on *** the feasibility of solving FSI by FVM was verified,the different effects of free,fixed and elastic supports on FSI in the commonly used and simplified Z-shaped pipe were further *** indicated that different support stiffness lead to various FSI *** coupling occurs at the elbow and less support is considered,then the pipe has a relatively large amplitude and complex pressure fluctuation.

关键词： Fluid-structure interaction Finite volume method Z-shaped pipe Support stiffness

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NUMERICAL SIMULATION OF EXTRUSION OF COMPOSITE POWDERS PREPARED BY HIGH ENERGY MILLING

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Acta Metallurgica Sinica(English Letters) 2004年第1期17卷 51-54页

作者： X.q.Li W.P.Chen W.Xia q.L.zhu Y.Y.Li E.D.Wang College of Mechanical Engineering South China University of Technology.Guangzhou 510640 China School of Materials Science and Engineering Harbin Institute of Technology Harbin 150001 China

Based on the characteristic of high energy milling and the micromechanics of composite material, a plastic constitutive equation is implemented for milled composite powders. To check the equation, the extrusion of Ti/Al composite powders prepared by high energy milling was simulated. It was from the numerical analysis that the predicted extrusion pressure mounted up with milling time and extrusion ratio increasing, which was perfect agreement with experimental results.

关键词： high energy milling composite powder plastic constitutive equation extrusion numerical simulation

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Encoding and Multiplexing of 2D Images with Orbital Angular Momentum Beams and the Use for Multiview Color Displays

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Research 2019年第1期2019卷 1144-1154页

作者： j.Chu D.Chu q.Smithwick Centre for Photonics Devices and Sensors University of Cambridge9 JJ Tomson AvenueCambridge CB30FAUK Disney Research GlendaleCalifornia 91201-5020USA

Te orthogonal nature of diferent orbital angular momentum modes enables information transmission in optical communications with increased bandwidth through mode division *** far the related works have been focused on using orbital angular momentum modes to encode/decode and multiplex point-based on-axis signals for maximum data channel numbers and *** orbital angular momentum modes can be utilized to encode/decode of-axis signals for multiplexing in twodimensional space is of signifcant importance both fundamentally and practically for its enormous potential in increasing the channel information *** this work,a direct use of orbital angular momentum modes to encode/decode and multiplex twodimensional images is realized in a scalable multiview display architecture,which can be utilized for viewing three-dimensional images from diferent *** efect of of-axis encoding/decoding and the resultant crosstalk between multiplexed diferent twodimensional views are *** on which,a color display of good image quality with four independent views is *** resolution of the decoded images is analyzed and the limitation of this approach ***,a spatially multiplexed data communication scheme is also proposed with such a two-dimensional encoding/decoding approach to signifcantly enhance the data transmission capacity in free space for future data communication needs.

关键词： orbital momentum utilized

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Convexification of Hybrid AC-DC Optimal Power Flow with Line-Commutated Converters

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CSEE journal of Power and Energy Systems 2024年第2期10卷 617-628页

作者： Hongyuan Liang Zhigang Li j.H.Zheng q.H.Wu School of Electric Power Engineering South China University of TechnologyGuangzhou 510641China

Line-commutated converter (LCC)-based high-voltage DC (HVDC) systems have been integrated with bulk AC power grids for interregional transmission of renewable power. The nonlinear LCC model brings additional nonconvexity to optimal power flow (OPF) of hybrid AC-DC power grids. A convexification method for the LCC station model could address such nonconvexity but has rarely been discussed. We devise an equivalent reformulation for classical LCC station models that facilitates second-order cone convex relaxation for the OPF of LCC-based AC-DC power grids. We also propose sufficient conditions for exactness of convex relaxation with its proof. Equivalence of the proposed LCC station models and properties, exactness, and effectiveness of convex relaxation are verified using four numerical simulations. Simulation results demonstrate a globally optimal solution of the original OPF can be efficiently obtained from relaxed model.

关键词： AC-DC power system convex relaxation linecommutated converter optimal power flow second-order cone programming

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Plastic Strain Energy Model for Rock Salt Under Fatigue Loading

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Acta Mechanica Solida Sinica 2018年第3期31卷 322-331页

作者： M.M.He N.Li B.q.Huang C.H.zhu Y.S.Chen Institute of Geotechnieal Engineering Xi'an University of TechnologyXi'an 710048China State Key Laboratory of Eco-hydraulics in Northwest Arid Region Xi'an University of TechnologyXi'an 710048China College of Information Engineering and Automation Kunming University of Science and TechnologyKunming 650500China Shaanxi Key Laboratory of Loess Mechanics and Engineering Xi'an University of TechnologyXi'an 710048China

The fatigue test for rock salt is conducted to investigate the effects of stress ampli- tude, loading frequency and loading rate on the plastic strain energy, from which the evaluation rule of the plastic strain energy is analyzed, which is divided into three stages： cyclic hardening, saturation and cyclic softening. The total accumulated plastic strain energy only depends on the mechanical behavior of rock salt, but is immune to the loading conditions. A novel model for fatigue life prediction is proposed based on the invariance of the total plastic dissipation energy and the stability of the plastic energy per cycle.

关键词： Rock salt Fatigue life Plastic energy

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