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Corrigendum to “The metallurgical bonding and high temperature tensile behaviors of 9Cr-1W steel and 316L steel dissimilar joint by friction stir welding” [J. Manuf. Process. 44 (2019) 241–251]

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Journal of Manufacturing Processes 2021年 64卷 1204-1205页

作者： Bin He Lei Cui Dongpo Wang Yongchang Liu Chenxi Liu Huijun Li Tianjin Key Laboratory of Advanced Joining Technology School of Materials Science and Engineering Tianjin University Tianjin 300354 PR China State Key Lab. of Hydraulic Engineering Simulation and Safety School of Materials Science & Engineering Tianjin University Tianjin 300354 PR China

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Multi-dimensional simulations for extensive off-design conditions of gas turbines by iterative-coupled methods using different characteristic maps of coaxial compressor and turbine

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Case Studies in Thermal Engineering 2025年 72卷

作者： Weimin Deng Guangming Ren Linyuan Jia Zuojun Wei Yuchun Chen Xiaohua Gan School of Power and Energy Northwestern Polytechnical University Xi'an 710072 China Department of Mechanics and Aerospace Engineering Southern University of Science and Technology Shenzhen 518055 China Science and Technology on Altitude Simulation Laboratory Mianyang 621000 China Shenzhen Key Laboratory of Wide-Speed-Range and Variable-Density Continuous Wind Tunnel Southern University of Science and Technology Shenzhen 518000 China National Key Laboratory of Science and Technology on Advanced Light-duty Gas-turbine Xi'an 710129 China

Multi-dimensional simulations offer a complementary numerical platform to gas turbine experimentation, generating supportive data for training adaptation and artificial intelligence models. However, the application of iterative-coupled simulations to extensive off-design conditions depends significantly on the accuracy of generic characteristic maps, particularly near choke and stall regions. In this study, multi-dimensional simulation based on iterative-coupled models using three different sets of maps was developed. Based on experimental speed characteristics data, the standard deviation of performance parameters simulated from the three iterative-coupled models was found to be less than 10 −3 . Further analysis reveals the convergence consistent traits that the different characteristic maps used in the iterative-coupled simulations only affect convergence speed and scope and do not impact the final convergence results. To apply iterative-coupled simulations to extensive off-design conditions, a self-moving strategy based on the convergence consistent traits of different characteristic maps was developed. The iterative-coupled simulations using the self-moving strategy have an extensive convergence scope, including adjustable-nozzle-area conditions (0.0013–0.008 m 2 , 78 %–479 %) and adjustable-power-extraction conditions (0–16 kW, 0 %–80 %). This demonstrates that the self-moving strategy for inexact generic characteristic maps can apply iterative-coupled simulations to extensive off-design, compared to the CLM with exact specific characteristic maps.

关键词： Iterative-coupled simulations Component-level model Adaptation method Gas turbine Thermodynamics Computational fluid dynamics

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Analysis of overload-based cascading failure in multilayer spatial networks

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Chinese Physics B 2020年第9期29卷 404-414页

作者： Min Zhang Xiao-Juan Wang Lei Ji Mei Song Zhong-Hua Liao School of Science Beijing University of Posts and TelecommunicationsBeijing 100876China School of Electronic Engineering Beijing University of Posts and TelecommunicationsBeijing 100876China Beijing Complex Product Advanced Manufacturing Engineering Research Center Beijing Simulation CenterBeijing 100854China State Key Laboratory of Intelligent Manufacturing System Technology Beijing Institute of Electronic System EngineeringBeijing 100854China

Many complex networks in real life are embedded in space and most infrastructure networks are interdependent,such as the power system and the transport *** this paper,we construct two cascading failure models on the multilayer spatial *** our research,the distance l between nodes within the layer obeys the exponential distribution P(l)~exp(-l/ζ),and the length r of dependency link between layers is defined according to node *** entropy approach is applied to analyze the spatial network structure and reflect the difference degree between *** metrics,namely dynamic network size and dynamic network entropy,are proposed to evaluate the spatial network robustness and *** the cascading failure process,the spatial network evolution is analyzed,and the numbers of failure nodes caused by different reasons are also counted,***,we discuss the factors affecting network *** demonstrate that the larger the values of average degree,the stronger the network *** the length r decreases,the network performs *** the probability p is small,asζdecreases,the network robustness becomes more *** p is large,the network robustness manifests better performance asζ*** results provide insight into enhancing the robustness,maintaining the stability,and adjusting the difference degree between nodes of the embedded spatiality systems.

关键词： cascading failure multilayer network load distribution spatial network entropy

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The effect of primary and secondary O phase on the mechanical properties and deformation behavior of Ti2AlNb alloy

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Journal of Alloys and Compounds 2025年 1032卷

作者： Zhou, Minghang Bu, Zhiqiang Zhou, Yi Wang, Jiakun Zhu, Liang Huang, Xu Li, Jinfu State Key Laboratory of Metal Matrix Composites School of Materials Science and Engineering Shanghai Jiao Tong University Shanghai200240 China Aviation Key Laboratory of Science and Technology on Advanced Titanium Alloys AECC Beijing Institute of Aeronautical Materials Beijing100095 China

The effect of different microstructure characteristics on the mechanical properties and deformation behavior of the Ti2AlNb alloy are investigated. The results show that the mechanical properties of the Ti2AlNb alloy can be significantly enhanced by modulating the size and content of the primary O (Opri) and secondary O (Osec) phase. Quasi-in-situ tensile tests and transmission electron microscopy observations indicate that the B2 phase is the primary deformation phase, with tensile deformation mainly utilizing the {110} slip systems, while the deformation of the O phase is governed by the basal slip system and minor prismatic slip systems. The Opri phase can simultaneous deformation with the B2 phase through single, double, and cross-slip modes, thus promoting the uniform plastic deformation. In contrast, the Osec phase can effectively impede dislocation slip and generate higher local stress levels. Therefore, to maintain the overall uniform deformation, the dislocations tend to pass through the Osec phase via cross-slip mode. The strengthening mechanism calculations suggest that the primary strengthening mechanisms of the Ti2AlNb alloy after heat treatment are the solid solution strengthening, and Orowan strengthening of Osec phase. These findings will provide a theoretical basis for optimization of microstructure and mechanical properties of Ti2AlNb alloy in the future. © 2025 Elsevier B.V.

关键词： Tenacity

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Analysis and optimizations of macro-pulse performances for a constructed high-power beam injector with a compact layout

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Nuclear Engineering and technology 2025年

作者： H. Hu Y. Wang H.J. Xu Y.F. Zeng T.N. Hu H.M. Wang G.Y. Feng Y.J. Pei State Key Laboratory of Advanced Electromagnetic Technology School of Electrical and Electronic Engineering Huazhong University of Science and Technology Wuhan 430074 China Chengdu Aircraft Design & Research Institute Aviation Industry Corporation of China Chengdu 610091 China National Synchrotron Radiation Laboratory University of Science and Technology of China Hefei 230029 China

The performance of terahertz (THz) radiation from free electron lasers (FEL) depends on the consistency of electron bunches within the macro-pulse, not just the properties of individual bunches. In accelerator-based injectors, bunch-to-bunch deviations often arise due to transient beam loading effects. This study investigates the impact of such transient responses on macro-pulse inconsistencies by combining theoretical analysis and particle simulations, using the FEL injector at Huazhong University of science and technology (HUST) as a case study. The goal is to optimize macro-pulse performance without requiring additional equipment or facility upgrades. To achieve this, an improved multi-objective optimization algorithm, NSGA-III, is introduced to optimize RF injection timing and phase settings, targeting energy and phase consistency within the macro-pulse and stable energy output. The approach is validated through extensive virtual simulations, which demonstrate its effectiveness in providing optimal initial settings for the HUST-FEL injector’s macro-pulse. Subsequent online experiments conducted on this injector have preliminarily validated the reliability of the proposed method as well. The results are applicable to other multi-bunch/macro-pulse injectors, offering a cost-effective solution for efficient beam commissioning and engineering implementation.

关键词： Beam injector transient beam loading free electron laser linac beam dynamics

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Exploration of the LHCb states and possible resonances in a unitary coupled-channel model

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The European Physical Journal C 2024年第7期84卷 1-10页

作者： Shen, Chao-Wei Rönchen, Deborah Meißner, Ulf-G. Zou, Bing-Song Wang, Yu-Fei Institute for Advanced Simulation (IAS-4) Forschungszentrum Jülich Jülich Germany Helmholtz-Institut für Strahlen- und Kernphysik and Bethe Center for Theoretical Physics Universität Bonn Bonn Germany Tbilisi State University Tbilisi Georgia Department of Physics Tsinghua University Beijing China CAS Key Laboratory of Theoretical Physics Institute of Theoretical Physics Chinese Academy of Sciences Beijing China School of Physics University of Chinese Academy of Sciences (UCAS) Beijing China School of Nuclear Science and Technology University of Chinese Academy of Sciences (UCAS) Beijing China

We extend our previous study of the interactions of $$\bar{D}^{(*)} \Lambda _c - \bar{D}^{(*)}\Sigma _c^{(*)}$$ within an analytic, unitary, coupled-channel approach by including the $$J/\psi p$$ channel and performing fits to the $$J/\psi p$$ invariant mass distributions in the $$\Lambda _b^0 \rightarrow J/\psi p K^-$$ decay by the LHCb Collaboration. We take into account the contributions of t-channel pseudoscalar and vector meson exchanges and u-channel baryon exchanges in this work, and a series of bound states and resonances with different spin-parities are dynamically generated. According to the results, four states have a significant impact on the physical observables, with two having a spin-parity of $$1/2^-$$ and the other two having $$3/2^-$$ . These states can be associated with the LHCb hidden-charm pentaquarks. We further provide the coupling strength between each pole and different channels, which provides some insights on how to search for them in future experiments. Moreover, we also search for poles in higher partial waves up to $$J=7/2$$ and find indications for the existence of several states with larger widths.

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Corrigendum to “Strong convergence theorem of a new modified Bregman extragradient method to solve fixed point problems and variational inequality problems in general reflexive Banach spaces [Communications in Nonlinear science and Numerical simulation, 135, (2024): CNSNS 108051]

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Communications in Nonlinear science and Numerical simulation 2024年 138卷

作者： Huilin Tan Qian Yan Gang Cai Qiaoli Dong School of Mathematical Sciences Chongqing Normal University College of Sciences Chongqing University of Technology Tianjin Key Laboratory for Advanced Signal Processing and College of Science Civil Aviation University of China

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MoO 3 -MoC/ [email protected] coupled heterostructures with strong connections and abundant interfaces for electromagnetic wave absorption

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Colloids and Surfaces A: Physicochemical and Engineering Aspects 2023年 668卷

作者： Yichao Yin Xiaojun Zeng Lei Xia Guangjie Xiong Hang Zhang Guoke Wei Aviation Key Laboratory of Science and Technology on Advanced Surface Engineering AVIC Manufacturing Technology Institute Beijing 100024 China School of Materials Science and Engineering Jingdezhen Ceramic University Jingdezhen 333403 China

Improving the electromagnetic wave (EMW) absorption capability at the thin thickness of heterostructures is critical but remains a great challenge. Here, we propose a MoO 3 @ZIF-67 core-shell heterostructure derived molybdenum trioxide- molybdenum carbide/ [email protected] carbon (MoO 3 -MoC/ [email protected] ) coupled heterostructure with a one-dimensional (1D) short rod-like structure for EMW absorption. A strong connection is constructed between [email protected] nanoparticles (NPs) and MoO 3 -MoC specie due to the pyrolysis strategy and in situ reaction between MoO 3 nanobelts and ZIF-67 rhombic dodecahedrons . The abundant heterointerfaces between N-doped carbon (NC) and metallic Co, [email protected] NPs and MoC species, [email protected] NPs and MoO 3 nanobelts, as well as MoC and MoO 3 nanobelts improve the interfacial polarization. Abundant defects, such as N heteroatoms and oxygen vacancies , are also established in the MoO 3 -MoC/ [email protected] coupled heterostructure. As a result, the MoO 3 -MoC/ [email protected] coupled heterostructure inherits excellent EMW absorption performance with a reflection loss ( R L ) value of − 64.3 dB at a thickness of 3.875 mm, outperforming many advanced EMW absorbers. This work shows the great potential of strong connections and abundant interfaces in heterostructure for improvements of EMW absorbers.

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Real-time characterization of VOC exposure in a few new residential apartments in Beijing 16

Real-time characterization of VOC exposure in a few new resi...

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16th Conference of the International Society of Indoor Air Quality and Climate: Creative and Smart Solutions for Better Built Environments, Indoor Air 2020

作者： Liu, Yingjun Xie, Di Qiu, Jia Li, Yatai Qu, Yuekun Liu, Ying Zhu, Tong Key Joint Laboratory of Environmental Simulation and Pollution Control College of Environmental Sciences and Engineering Peking University Beijing100871 China Beijing Innovation Center for Engineering Science and Advanced Technology Peking University Beijing100871 China

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Global Dynamics and Optimal Design of a New Highly Efficient Nonlinear Energy Sink Based on Magnetic-Elastic Impacts with Negative Stiffness

Research Square

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Research Square 2021年

作者： Li, Shuangbao Wang, Tingting Chen, Jianen Research Institute of Science and Technology Innovation Civil Aviation University of China Tianjin300300 China College of Science Civil Aviation University of China Tianjin300300 China Tianjin Key Laboratory for Advanced Mechatronic System Design and Intelligent Control School of Mechanical Engineering Tianjin University of Technology Tianjin300384 China

A new highly efficient elastic-impact bistable nonlinear energy sink (EI-BNES) based on magnetic-elastic impacts with negative stiffness and bistability is proposed and optimized through global dynamical analysis. The EI-BNES has better robustness and higher energy dissipation rates with nearly more than 96.5% for broadband impulsive excitations than the traditional cubic NESs and single bistable NESs. The structure of negative stiffness impacts is realized by reasonable layout of permanent ring magnets and springs. A two-degree-of-freedom (two-DOF) elastic-impact system is established to describe the coupled nonlinear interaction between the main structure and the attached EI-BNES. A global Melnikov reduction analysis (GMRA) is proposed to study global dynamics and homoclinic bifurcations of the reduced two-dimensional subsystem, which is used to explain the mechanism of nonlinear targeted energy transfer (TET) and detect the threshold of impulsive amplitudes of EI-BNES for in-well and compound motions between in-well and cross-well resonance responses. A special type of saddle-center equilibrium points is also found in the non-smooth system of the EI-BNES and can be used to effectively increase the energy dissipation rates. The optimal design criterion of the tuned EI-BNES for better dissipation performance is also first discussed based on the GMRA and numerical techniques for calculating the Melnikov function of the non-smooth systems. The effectiveness of the analytical GMRA is also verified by numerical simulations. © 2021, CC BY.

关键词： Stiffness

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