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arXiv 2023年

作者： Xu, Fangfang Li, Bo Ren, Zhengxue X. Zhao, Pengwei State Key Laboratory of Nuclear Physics and Technology School of Physics Peking University Beijing100871 China Institut für Kernphysik Institute for Advanced Simulation Jülich Center for Hadron Physics Forschungszentrum Jülich JülichD-52425 Germany Helmholtz-Institut für Strahlen- und Kernphysik Bethe Center for Theoretical Physics Universität Bonn BonnD-53115 Germany

Covariant density functional theory is solved in 3D lattice space by implementing the preconditioned conjugate gradient method with a filtering function (PCG-F). It considerably improves the computational efficiency compared to the previous inverse Hamiltonian method (IHM). This new method is then applied to explore the tetrahedral shape of 110Zr in the full deformation space. The ground state of 110Zr is found to have a tetrahedral shape, but the deformations β31 and β33 greatly soften the potential energy surface. This effect is analysed with the microscopic evolution of the single-particle levels near the Fermi surface driven by the deformation. © 2023, CC BY.

关键词： Density functional theory

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Enhancing the high-cycle fatigue performance of GH4169 alloy by eliminating structural stress concentration through high-energy impact composite modification

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Fundamental Research 2025年

作者： Qiang Wang Guoxin Lu Ayder Nabiev Oday I. Abdullah Zhong Ji Zhong Chen Aviation Key Laboratory of Science and Technology on Advanced Corrosion and Protection for Aviation Material AECC Beijing Institute of Aeronautical Materials Beijing 100095 China MOE Key Laboratory for Liquid-Solid Structural Evolution and Processing of Materials Shandong University Jinan 250061 China Institute of Mechanics and Seismic Stability of Structures of the Academy of Sciences of the Republic of Uzbekistan Department of Theory of Mechanisms and Machines Tashkent 100125 Uzbekistan Department of Energy Engineering College of Engineering University of Baghdad Baghdad Iraq Jiangsu Key Laboratory of Advanced Manufacturing Technology Huaiyin Institute of Technology Huai’an 223001 China

Despite the advancements of traditional surface treatments like shot peening (SP) and laser shock peening (LSP) in enhancing the fatigue life of GH4169 superalloy, these techniques remain limited, particularly under high-stress concentration conditions. This study introduces a novel high-energy impact composite modification method that integrates SP and LSP to comprehensively address the fatigue strength sensitivity to stress concentration, a persistent issue for GH4169 in high-cycle fatigue applications. For the modified specimens, the fatigue limit under high-stress concentration conditions of Kt  = 3 increased from 215 MPa to 517 MPa, more than doubling. Compared to grinding, composite modification shifts fatigue crack initiation from the surface to subsurface regions, demonstrating superior fatigue resistance. The high-intensity surface modification eliminates structural stress concentration as the primary factor determining the fatigue life of the material. The concentrated stress at the carbide phase interfaces within the material, which cannot be sufficiently weakened by residual compressive stress, becomes the new weak point. The study concludes that high-energy impact composite modification offers a viable method to enhance the durability and performance of GH4169 superalloys in demanding applications.

关键词： High-energy modification GH4169 Residual stress High-cycle fatigue

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An Application of Cognitive Workload and Situational Awareness Assessment in Human Safety Demonstration of NPP

An Application of Cognitive Workload and Situational Awarene...

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System Reliability and Safety Engineering (SRSE), International Conference on

作者： Zhihui Xu Hang Liu Can Zhou Yunqing Gao Jipu Wang Yuxin Zhang Jun Yang Ming Yang Fundamental Science on Nuclear Safety and Simulation Technology Laboratory Harbin Engineering University Harbin China State Key Laboratory of Nuclear Power Safety Monitoring Technology and Equipment China Nuclear Power Engineering Co. Ltd. Shenzhen China Institute for Advanced Study in Nuclear Energy & Safety College of Physics and Optoelectronic Engineering Shenzhen University Shenzhen China School of Electrical Power South China University of Technology Guang Zhou China

This paper provides a brief summary of cognitive workload and situational awareness assessment methodologies that are available to support nuclear power plant human factors assessment and validation activities. These methodologies are reviewed in respect to their strengths and weakness in supporting the ongoing/future human factors program for the NPP project. This paper also describes how the assessment of cognitive workload and situational awareness is an integral aspect of the work to substantiate human safety claimed in NPP. However, these methodologies require more detailed design and operating information of the NPP project. Due to the unavailability of detailed design information and operating procedures required for high fidelity task simulation in design stage, cognitive workload and situation awareness are assessed through the assessment of related Performance Shaping Factors through human reliability method.

关键词： Psychology Human factors Hafnium Reliability engineering Safety Task analysis Power generation

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Crystalline order and disorder in dusty plasmas investigated by nonequilibrium molecular dynamics simulations

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Chinese Physics B 2019年第5期28卷 181-188页

作者： Aamir Shahzad Maogang He Sheeba Ghani Muhammad Kashif Tariq Munir Fang Yang Molecular Modeling and Simulation Laboratory Department of Physics Government College University Faisalabad (GCUF) Key Laboratory of Thermo-Fluid Science and Engineering of Ministry of Education Xi’an Jiaotong University Department of Physics University of Engineering and Technology (UET) Lahore College of Physics Civil Aviation University of China

The particle structure of a complex system has been explored through a unique Evans' s homogenous nonequilibrium molecular dynamics(HNEMD) simulation technique. The crystalline order–disorder structures(OD-structures) and the corresponding energies of three-dimensional(3 D) nonideal complex systems(NICSs) have been measured over a wide range of plasma states(■, κ) for a body-centered cubic(BCC) structure. The projected technique provides accurate ODstructures with fast convergence and applicable to very small size effect for different temperatures(≡ 1/■) and constant force field(F~*) values. The OD-structure obtained through HNEMD approach is found to be reasonable agreement and more reliable than those earlier identified by simulation approaches and experimental data of NICSs. New simulations of OD-structures show that dusty plasma remains in crystalline(strongly coupled) state at lower temperature and constant F*values, for the whole simulation runs. Our investigations show that the crystalline structure is changed and the particle structure switches from intermediate to disorder(nonideal gaseous) state with an increase of the system's temperature. It has been shown that the long range order shifts toward lower temperature with increasing κ. The presented technique exhibits that the potential energy has a maximum value when the dusty plasma remains in crystalline states(low temperatures),which confirms earlier 3 D simulation results.

关键词： nonequilibrium molecular dynamics crystalline structures nonideal complex systems dusty plasmas strongly coupled regime

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Control design under attacks of multi-agent switched systems via arbitrary switching

Control design under attacks of multi-agent switched systems...

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Chinese Automation Congress (CAC)

作者： Zhanjie Li Yajing Ma Institute of Advanced Technology for Carbon Neutrality Nanjing University of Posts and Telecommunications Nanjing China Provincial Engineering Research Center for New Energy Vehicle Intelligent Control and Simulation Test Technology Sichuan Xihua University Chengdu China School of Internet of Things Jiangsu Key Laboratory of Broadband Wireless Communication and Internet of Things Nanjing University of Posts and Telecommunications Nanjing China

In this paper, the consensus control against attacks for a type of nonlinear multi-agent switched systems under arbitrary switching is studied. The attacks corrupt the information data, which cannot be used for the feedback design. Meanwhile, the switching logic is not allowed to be designed. To tackle the complicated effects, some intermediate variables and adaptive laws are introduced to compensate the uncertainties. By constructing a common Lyapunov function, an adaptive protocol is proposed such that the outputs of the agents achieve consensus against attacks under arbitrary switching.

关键词： Switched systems Uncertainty Automation Adaptive systems Control design Switches Consensus control

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Walk the Line: The Role of Gender and Culture on the Movement Patterns of Pedestrians Based on a Multicultural Study

SSRN

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SSRN 2024年

作者： Chraibi, Mohcine Feliciani, Claudio Haghani, Milad Jia, Xiaolu Ma, Jian Institute of Advanced Simulation Forschungszentrum Jülich GmbH Wilhelm-Johnen-Straße Jülich52428 Germany School of Engineering The University of Tokyo 7-3-1 Hongo Bunkyo-ku Tokyo113-8656 Japan Research Center for Advanced Science and Technology The University of Tokyo 4-6-1 Komaba Meguro-ku Tokyo153-8904 Japan Sydney SydneyNSW2052 Australia Beijing Key Laboratory of Traffic Engineering Beijing University of Technology 100 Pingleyuan Chaoyang District Beijing100124 China School of Transportation and Logistics Southwest Jiaotong University 999 Xi’an Road Pidu District Sichuan Chengdu611756 China

Experimental work has opened new avenues for studying crowd behavior under well-controlled conditions with desirable levels of measurement accuracy. However, unlike many other areas of behavioral science, little attention has been paid to how reproducible and transferable crowd phenomena are between different populations. As such, there is only limited knowledge about how universal and generalizable experimental observations on crowd behavior *** research explores how gender and culture impact pedestrian dynamics in single-file movement, a topic previously studied in isolation through disjointed and varied experiments. Here, for the first time, and as an attempt to investigate external validity and generalizability across cultures, we conduct the same experiment in five different countries. Each experiment examines the effects of varying gender compositions on single-file pedestrian *** observed consistent effects of different gender compositions on pedestrian movement across countries, with no significant deviations in the fundamental diagrams, especially in the bounded regime. Although there was some variability in acceleration behavior across countries. Interaction levels, clustering behavior, and pedestrian spacing patterns remained consistent between different gender compositions and countries. These results suggest that, while the behavior of collective motion varies by culture and gender composition, most aspects of pedestrian movement exhibit universal traits. Understanding these variations and commonalities can allow for better infrastructure design and planning tailored to the population of interest. © 2024, The Authors. All rights reserved.

关键词： Behavioral research

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Mold Wear During Die Forging Based on Variance Analysis and Prediction of Die Life

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Transactions of Nanjing University of Aeronautics and Astronautics 2020年第6期37卷 872-883页

作者： CAI Ligang LIU Haidong PAN Junjie CHENG Qiang CHU Hongyan Beijing Key Laboratory of Advanced Manufacturing Technology Beijing University of TechnologyBeijing 100124P.R.China Guizhou Anda Aviation Forging Co Ltd Anshun 561005P.R.China

A process parameter optimization method for mold wear during die forging process is proposed and a mold life prediction method based on polynomial fitting is presented,by combining the variance analysis method in the orthogonal test with the finite element simulation test in the forging *** process parameters with the greatest influence on the mold wear during the die forging process and the optimal solution of the process parameters to minimize the wear depth of the mold are *** hot die forging process is taken as an example,and a mold wear correction model for hot forging processes is derived based on the Archard wear *** element simulation analysis of die wear process in hot die forging based on deform software is performed to study the relationship between the wear depth of the mold working surface and the die forging process parameters during hot forging *** optimized process parameters suitable for hot forging are derived by orthogonal experimental design and analysis of *** average wear amount of the mold during the die forging process is derived by calculating the wear depth of a plurality of key nodes on the mold *** life for the entire production process is predicted based on average mold wear depth and polynomial fitting.

关键词： die forging process Deform analysis of variance mold wear die life prediction

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Dynamic Behavior of a Fluid-Conveying Pipe with an Internal Nonlinear Support

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International Journal of Structural Stability and Dynamics 2025年

作者： Yang, Ting Wang, Cheng Zhao, Yuhao Key Laboratory of Advanced Manufacturing Technology of the Ministry of Education Guizhou University Guiyang550025 China Air China Development Guizhou Liyang Aviation Power Co. Ltd. Guiyang550014 China

Fluid-conveying pipes are widely used in construction, aerospace, marine and ocean engineering, and many other engineering domains as fundamental engineering elements. Understanding the fluid's dynamic behavior and vibration characteristics is crucial for properly mitigating unanticipated vibrations. In this work, a fluid-conveying pipe with an internal nonlinear support is modeled for dynamic behavior analysis. The Galerkin truncation technique can be used to predict the nonlinear dynamic behavior of internally nonlinearly supported fluid-transporting pipes. The mode functions of the fluid-conveying pipe that is normally constrained serve as the trial and weight functions in relation to the Galerkin truncation method. The fluid-conveying pipe with internal nonlinear support's nonlinear dynamic responses is verified using the harmonic balance technique. The impact of the sweeping techniques and internal nonlinear support parameters on the fluid-conveying pipe's dynamic responses with internal nonlinear support is thus investigated. In summary, initial values have an impact on the fluid-conveying pipe's dynamic reactions with internal nonlinear support. The fluid-conveying pipe's vibration states can be efficiently changed by the fluid velocity, internal nonlinear stiffness and internal nonlinear support location. Vibrations at both ends of the fluid-conveying pipe can be lessened by using the proper fluid velocity, nonlinear internal support stiffness and internal nonlinear support position parameters. © 2026 World Scientific Publishing Company.

关键词： Ocean engineering

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Crystal Thermal Transport in Altermagnetic RuO2

arXiv

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arXiv 2023年

作者： Zhou, Xiaodong Feng, Wanxiang Zhang, Run-Wu Šmejkal, Libor Sinova, Jairo Mokrousov, Yuriy Yao, Yugui Centre for Quantum Physics Key Laboratory of Advanced Optoelectronic Quantum Architecture and Measurement MOE School of Physics Beijing Institute of Technology Beijing100081 China Beijing Key Lab of Nanophotonics and Ultrafine Optoelectronic Systems School of Physics Beijing Institute of Technology Beijing100081 China Laboratory of Quantum Functional Materials Design and Application School of Physics and Electronic Engineering Jiangsu Normal University Xuzhou221116 China Institute of Physics Johannes Gutenberg University Mainz Mainz55099 Germany Institute of Physics Czech Academy of Sciences Cukrovarnická 10 Praha 6162 00 Czech Republic Peter Grünberg Institut Institute for Advanced Simulation Forschungszentrum Jülich and JARA Jülich52425 Germany

We demonstrate the emergence of a pronounced thermal transport in the recently discovered class of magnetic materials − altermagents. From symmetry arguments and first principles calculations performed for the showcase altermagnet, RuO2, we uncover that crystal Nernst and crystal thermal Hall effects in this material are very large and strongly anisotropic with respect to the Néel vector. We find the large crystal thermal transport to originate from three sources of Berry’s curvature in momentum space: the Weyl fermions due to crossings between well-separated bands, the strong spin-flip pseudo-nodal surfaces, and the weak spin-flip ladder transitions, defined by transitions among very weakly spin-split states of similar dispersion crossing the Fermi surface. Moreover, we reveal that the anomalous thermal and electrical transport coefficients in RuO2 are linked by an extended Wiedemann-Franz law in a temperature range much wider than expected for conventional magnets. Our results suggest that altermagnets may assume a leading role in realizing concepts in spincaloritronics not achievable with ferromagnets or antiferromagnets. Copyright © 2023, The Authors. All rights reserved.

关键词： Ruthenium compounds

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Realizing High Thermoelectric Performance in N-Type Snse Polycrystals Via Cecl3 Doping

SSRN

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SSRN 2023年

作者： Li, Shan Hou, Shuaihang Liu, Haoming Yin, Li Bao, Xin Li, Juan Wang, Xiaodong Ye, Xinli Zhang, Qian School of Civil Aviation Northwestern Polytechnical University Xi’an710072 China Research & Development Institute of Northwestern Polytechnical University in Shenzhen Shenzhen518063 China School of Materials Science and Engineering Institute of Materials Genome & Big Data Harbin Institute of Technology Shenzhen518055 China Yangtze River Delta Research Institute of NPU Taicang215400 China State Key Laboratory of Advanced Welding and Joining China

SnSe is a promising thermoelectric material because of its intrinsic low lattice thermal conductivity. However, the inferior electrical transport properties restricted the thermoelectric performance of n-type SnSe polycrystals especially at lower temperature range. In this work, an effective strategy to enhance the performance of n-type SnSe polycrystals by CeCl3 doping is reported. CeCl3 doping increased both the carrier concentration and effective mass. The high weighted mobility contributed to the high power factor over the whole temperature range. Combined with the reduced thermal conductivity, a peak zT of ~1.3 at 823 K was obtained in SnSe0.92+1 mol% CeCl3 with an average zT of ~0.36 in the temperature range of 300 to 773 K. This work suggests that CeCl3 doping is an effective way to optimize the thermoelectric properties of n-type SnSe polycrystals. © 2023, The Authors. All rights reserved.

关键词： Selenium compounds

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