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27th IEEE International Conference on Intelligent Transportation Systems, ITSC 2024

作者： Tan, Lei Zhang, Xiaohan Zeng, Xinrui Hu, Xiaoxi Chen, Fei Liu, Zongyang Liu, Jin Tang, Tao Beijing Jiaotong University State Key Laboratory of Advanced Rail Autonomous Operation Beijing100044 China Beijing Municipal Engineering Research Institute Beijing100037 China College of Information and Electronic Engineering Zhejiang University Hangzhou310015 China School of Mathematical Sciences Beihang University Beijing100191 China Wuhan University State Key Laboratory of Water Resources Engineering and Management Wuhan430072 China Institute of Artificial Intelligence Huazhong University of Science and Technology Wuhan430074 China Institute for Transport Studies University of Leeds LeedsLS2 9JT United Kingdom

ISBN: (纸本)9798331505929

As railway facilities and equipment maintenance becomes a focal point of current railway research, tunnels, as fundamental components of railway infrastructure, rightly garner attention for intelligent railway maintenance. However, detecting tunnel lining joints poses challenges due to their potential confusion with other internal tunnel objects such as pipelines and cables. To address this issue, we propose an effective segmentation method, LCJ-Seg, leveraging Global Perception Module (GPM) and Detail Preservation and Feature Denoising Module (DPFDM). The GPM is incorporated into the backbone for accurately identifying tunnel lining joints, as these joints require global context to properly distinguish them from other internal tunnel objects. The DPFDM preserves fine details and reduces noise of low-level features to enhance feature fusion. It ensures that both high-level and low-level features retain important details crucial for the lining construction joint segmentation task. Comprehensive comparative experiments and ablation studies on a real collected dataset, demonstrating the superiority of our approach over existing segmentation methods. © 2024 IEEE.

关键词： Tunnel linings

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Tuning the dual-active sites of ZIF-67 derived porous nanomaterials for boosting oxygen catalysis and rechargeable Zn-air batteries

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Nano Research 2021年第7期14卷 2353-2362页

作者： Zeyi Zhang Yangyang Tan Tang Zeng Liyue Yu Runzhe Chen Niancai Cheng Shichun Mu Xueliang Sun College of Materials Science and Engineering Fuzhou UniversityFuzhou 350108China State Key Laboratory of Advanced Technology for Materials Synthesis and Processing Wuhan University of TechnologyWuhan 430070China Department of Mechanical and Materials Engineering University of Western OntarioLondonON N6A 5B9Canada

The rational control of the active site of metal-organic frameworks(MOFs)derived nanomaterials is essential to build efficient bifunctional oxygen reduction/evolution reaction(ORR/OER)***,through designing and constructing a Co_(3)O_(4)-Co heterostructure embedded in Co,N co-doped carbon polyhedra derived(Co_(3)O_(4)-Co@NC)from the in-situ compositions of ZIF-67 and cobalt nanocrystals synthesized by the strategy of in-situ NaBH4 reduction,the dual-active site(Co_(3)O_(4)-Co and Co-N_(x))is synchronously realized in a MOFs derived *** formed Co_(3)O_(4)-Co@NC shows excellent bifunctional electrocatalytic activity with ultra-small potential gap(ΔE=E_(j=10)(OER)–E_(1/2)(ORR))of 0.72 V,which surpasses the commercial Pt/C and RuO_(2) *** theory calculation results reveal that the excellent bifunctional electrocatalytic activity can be attributed to the charge redistribution of Co of Co-N_(x) induced by the synergistic effects of well-tuned active sites of Co_(3)O_(4)-Co nanoparticle and Co-N_(x),thus optimizing the rate-determining step of the desorption of O_(2)^(*)intermediate in ORR and OH^(*)intermediate in *** rechargeable Zn-air batteries with our bifunctional catalysts exhibit superior performance as well as high cycling *** simple-effective optimization strategy offers prospects for tuning the active site of MOF derived bifunctional catalyst in electrochemical energy devices.

关键词： dual-active sites bifunctional oxygen electrocatalysts metal−organic frameworks Zn-air batteries density functional theory(DFT)

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A New Excitation Power Supply for Large Capacity Superconducting Condenser

A New Excitation Power Supply for Large Capacity Superconduc...

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International Conference on Electrical Machines and Systems (ICEMS)

作者： Guangyi Zhang Chun Song Fan Zhou Dayi Li Jie Gong Weiyu Wang State Key Laboratory of Advanced Electromagnetic Engineering and Technology Huazhong University of Science and Technology Wuhan China

Superconducting condenser has the characteristics of small excitation resistance and small transient and sub transient reactance. Therefore, compared with conventional condenser, superconducting condenser can output greater reactive power and has better reactive power compensation characteristics. Just like the conventional condenser, the superconducting condenser also needs to be equipped with its supporting excitation power supply. At present, there is less research on the excitation power supply of the superconducting condenser. Therefore, this paper proposes a new excitation power supply system relative to the superconducting condenser, which lays a theoretical foundation for the future research work. Firstly, the structural characteristics of the 10M var HTS condenser are described, and the characteristics of the excitation winding are defined; Secondly, based on the characteristics of the excitation winding, a new design scheme of excitation power supply system is proposed: the scheme can achieve the separation of forced excitation module and constant excitation module, and the forced excitation module uses uncontrolled rectifier to provide high voltage and strong current; Constant excitation module uses four intersecting and staggered parallel buck circuit as low ripple power supply, which can not only ensure the speed of forced excitation, but also ensure the high precision requirements of constant excitation. Finally, Matlab / Simulink simulation software is used to verify the feasibility of the excitation system.

关键词： Resistance High-temperature superconductors Reactive power Power supplies Software packages Windings Rectifiers

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Analysis of Gas-Cooled Micro Modular Reactor (MMR) Fuel

SSRN

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SSRN 2024年

作者： Deng, Chaoqun Zhu, Siyang He, Yanan Wu, Yingwei He, Kai Zhang, Jing Su, Guanghui School of Nuclear Science and Technology Shaanxi Key Laboratory of Advanced Nuclear Energy and Technology State Key Laboratory of Multiphase Flow in Power Engineering Xi'an Jiaotong University Xi’an710049 China China Nuclear Power Engineering Co. Ltd. Beijing100840 China

The gas-cooled micro modular reactor (MMR) is a novel concept with compact fuel form consists of thousands of tri-isotropic fuel (TRISO) particles dispersed in silicon carbide matrix. The MMR fuel is high volume packing fraction and horizontally placed within graphite channels. Due to the complexity of the fuel structure and the challenges involved in simulation, a multi-scale and multi-physics coupled analyses method of MMR fuel was realized in this work by implementing physical models into the open-source finite element platform MOOSE. Though the simulation of the typical design MMR fuel during normal operation, the thermal-mechanical analysis and the failure analysis were conducted. The results show that the arrangement of MMR fuel horizontally within graphite channels resulted in non-uniform gap between the fuel and graphite brick, leading to an "off-center" temperature distribution within the fuel, the peak temperature is about 1314 K. Higher-temperature sub-zones exhibit greater internal pressure within TRISO and show greater tensile stress in the Chemical Vapor Deposited Silicon Carbide (CVD-SiC) layer. Regarding fuel failure analysis, this work found limited impact from Pd penetration and kernel migration. Pressure-induced particle failure, closely linked with stress in CVD-SiC, emerges as the primary failure criterion. The overall probability of fuel failure remains relatively low, with a maximum probability of 4.1×10-5. Statistical data reveals that a significant majority (71%) of TRISO particles exhibit a failure probability below 2×10-5, while only 8.8% reach 4×10-5 © 2024, The Authors. All rights reserved.

关键词： Graphite

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Nanostructured Ni-MoCx:An efficient non-noble metal catalyst for the chemoselective hydrogenation of nitroaromatics

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Nano Research 2023年第7期16卷 8919-8928页

作者： Yifei Zhang Zhiwen Li Jingjing Zhang Liangliang Xu Zhong-Kang Han Alfons Baiker Gao Li Institute of Catalysis for Energy and Environment College of Chemistry and Chemical EngineeringShenyang Normal UniversityShenyang 110034China State Key Laboratory of Catalysis Dalian Institute of Chemical PhysicsChinese Academy of SciencesDalian 116023China Department of Chemical and Biomolecular Engineering Korea Advanced Institute of Science and Technology(KAIST)Daejeon 34141Republic of Korea School of Materials Science and Engineering Zhejiang UniversityHangzhou 310027China Department of Chemistry and Applied Biosciences Institute for Chemical and BioengineeringETH ZurichHönggerbergHClZurich CH-8093Switzerland University of Chinese Academy of Sciences Beijing 100049China

Catalysts for chemoselective hydrogenation are of vital importance for the synthesis of various important chemicals and *** we developed a simple method for preparing a highly efficient Ni-MoC_(x)nanocomposite catalyst via temperature-programmed carburization of a polyoxometalate precursor.X-ray diffraction(XRD),scanning transmission electron microscopy(STEM),X-ray photoelectron spectroscopy(XPS),and X-ray absorption spectroscopy(XAS)analyses indicate that the resulting mesoporous nanocomposite catalyst is made up of well-dispersed metallic nickel particles embedded in a MoC_(x)*** catalyst exhibits high activity and selectivity(>99%)in the hydrogenation of various substituted nitroaromatics to corresponding *** high efficiency is attributed to the intimate contact of the constituents favoring electron transfer and hydrogen *** is physisorbed on the carbide support and dissociates on the nickel particles,as evidenced by Mo K-edge X-ray absorption near-edge structure(XANES)spectra,density functional theory(DFT),and hydrogen-deuterium *** remarkable catalytic performance of the catalyst could be traced back to the synergistic interaction between the Ni particles and the carbide ***-situ infrared spectroscopy and DFT simulations indicated that the adsorption/activation of the nitro group is favored compared to that of other substituents at the aromatic *** recyclability tests,the Ni-MoC_(x)nanocomposite showed no significant loss of catalytic performance in seven consecutive runs,indicating its robust nature.

关键词： Ni-MoC_(x)nanocomposite carburization of polyoxometalate hydrogenation nitroaromatics synergistic effect

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Change in elastic properties during room-temperature aging in body-centered cubic Mg-Li and Mg-Li-Al single crystals

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Journal of Materials Science & technology 2022年第14期109卷 49-53页

作者： Ruxia Liu Shota Higashino Koji Hagihara Lianmeng Zhang Tohru Sekino Masakazu Tane SANKEN(The Institute of Scientific and Industrial Research) Osaka University8-1 MihogaokaIbarakiOsaka 567-0047Japan State Key Laboratory of Advanced Technology for Materials Synthesis and Processing Wuhan University of TechnologyWuhan430070China Graduate School of Engineering Osaka City University3-3-138 SugimotoOsaka558-8585Japan Department of Physical Science and Engineering Nagoya Institute of TechnologyNagoya 466-8555Japan

Biodegradable materials,with many advantages over conventionally used non-biodegradable materials,have received much attention owing to the elimination of the need for a secondary surgery for the removal of implants after *** with other biodegradable ceramics and/or polymers,Mg alloys are considered to be the most promising biodegradable orthopedic materials because they feature not only high specific strength and compressive yield strength but also a low Young’s modulus,which is comparable to that of human bones(10-30 GPa)[1,2].

关键词： strength aging alloys

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Friction and wear behaviour of friction-induced crystallinity of polyaryl ether ketone (PAEK)

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Wear 2025年 576-577卷

作者： Li, Mengjiao Zhang, Ke Ma, Shengqi Liu, Gang Yao, Jianan Liu, Hao Center for Advanced Low-Dimension Materials State Key Laboratory of Advanced Fiber Materials College of Materials Science and Engineering Donghua University Shanghai201620 China Laboratory of High Performance Plastics Ministry of Education National & Local Joint Engineering Laboratory for Synthesis Technology of High Performance Polymer College of Chemistry Jilin University Changchun130012 China Shandong Institute of Nonmetallic Materials Jinan250031 China Institute of Advanced Technology and Equipment Beijing University of Chemical Technology Beijing100029 China

Poly aryl ether ketone (PAEK) is increasingly attractive as an essential matrix for its remarkable comprehensive performance. However, studies on the correlation between crystallinity and tribological properties of PAEK are still questionable. This study aimed to correlate the crystallinity of PAEK with its tribological properties and to analyze the behavior of friction-induced crystallization of PAEK in its nearly amorphous state. Herein, almost amorphous PAEK-A and semicrystalline PAEK were fabricated via injection molding, and the behavior of friction-induced crystallization of PAEK was investigated under dry sliding conditions at a pressure of 50 N and a velocity of 0.21 m/s. According to the results, PAEK-4A exhibited the lowest wear rate of 28.8 × 10−6 (mm3/Nm) of four PAEK-A in different flowabilities. The crystallinity of PAEK-4A wear debris was 33.9 %, which increased by 25.3 % compared with the initial samples. The intensity ratio of Raman characteristic peaks to characterize crystallinity variation also demonstrated the increase of crystallinity on the wear track (1.6–2.7). The crystallization behavior of PAEK-A wear debris and the crystalline behavior of PAEK-A triggered by the friction process played a positive role in improving the wear resistance of PAEK-A. This research guides the influence of various parameters on the friction performance of high-performance PAEK. © 2025 Elsevier B.V.

关键词： Tribology

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Short Circuit Calculation Method of Power System with Renewable Energy Sources and Experimental Verification

Short Circuit Calculation Method of Power System with Renewa...

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IEEE Conference on Energy Internet and Energy System Integration (EI2)

作者： Qinghua Lai Zhe Zhang Jiexiang Han Xianggen Yin State Key Laboratory of Advanced Electromagnetic Engineering and Technology Huazhong University of Science and Technology Wuhan China

ISBN: (纸本)9781665434263

In the short-circuit current calculation of power grid, the renewable energy sources (RES) cannot use the equivalent method similar to the traditional synchronous generator because of the access mode and low voltage ride through control strategy. Therefore, it is difficult to solve the short circuit current directly by the traditional fault analysis method. According to the control strategy and fault characteristics of different types of RES, the equivalent calculation model of RES is obtained, especially the equivalent calculation model of doubly fed power sources when the negative sequence short-circuit current is not zero. On this basis, the node voltages equation and the iterative calculation method of the short-circuit current for the power grid with different types of RES are given. Then, an experimental platform with RES is established. The correctness of the equivalent calculation model and the iterative calculation method of short-circuit current are verified by short-circuit experiment.

关键词： Renewable energy sources Low voltage Short-circuit currents System integration Power grids Mathematical models Synchronous generators

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A Two-stage Electric Energy Scheduling Strategy for Pelagic Island Microgrid Clusters

A Two-stage Electric Energy Scheduling Strategy for Pelagic ...

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IEEE Asia Power and Energy engineering Conference (APEEC)

作者： Quan Sui Fanrong Wei Xiangning Lin Zhengtian Li State Key Laboratory of Advanced Electromagnetic Engineering and Technology Huazhong University of Science and Technology Wuhan China

Electric vessels (EVs) can achieve interisland energy transmission among pelagic island microgrid clusters (PIMGCs) by charging or discharging. However, the renewable generation uncertainties may impact the operational economy of PIMGGs integrating EVs. To address the problem, this paper proposes a two-stage electric energy scheduling strategy. First, by analyzing the power regulation and sailing characteristics of an EV, an interisland spatial-temporal energy transmission model is established. Additionally, a two-stage electric energy scheduling model integrating the network constraints is proposed, where the day-ahead stage optimizes the EV travel trajectory decisions, and the intra-day stage manages the unit and EV power using the model prediction control (MPC) method. On this basis, this optimization model is converted into a classic mixed-integer second-order cone programming (MI-SOCP) problem, and efficiently solved by commercial solver. Simulation studies on pelagic islands in South China Sea indicate that the proposed scheduling strategy is effective and beneficial for PIMGCs.

关键词： Reactive power Uncertainty Power supplies Simulation Microgrids Predictive models Programming

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Research on AH-FDTD method based on improved UPML boundary condition

Research on AH-FDTD method based on improved UPML boundary c...

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2022 IEEE International Symposium on Antennas and Propagation and USNC-URSI Radio Science Meeting, AP-S/URSI 2022

作者： Sun, Yaxiu Zhang, Xiaomin Sun, Ruifeng Wang, Junyan Zhang, Dawei Harbin Engineering University College of Information and Communication Engineering Harbin150001 China Harbin Engineering University Key Laboratory of Advanced Marine Communication and Information Technology Ministry of Industry and Information Technology Harbin150001 China State Grid Harbin Electric Power Supply Company China

ISBN: (数字)9781665496582

ISBN: (纸本)9781665496582

In this paper, an improved uniaxial anisotropic perfectly matched layer (UPML) absorption boundary method based on the Associate Hermite polynomial finite-difference time-domain (AH-FDTD) is used to analyze transient response of electromagnetic field in time domain. The method uses AH basis function to extend Maxwell's equations, and uses Galekin principle to eliminate time variables, and separates time and space variables, so that the method is not restricted by Courant-Friedrich-Levy (CFL) conditions. The improved UPML absorbing boundary adds a new attenuation factor and improves the attenuation effect of low-frequency wave group. The FDTD method, Alternating Direction Implicit FDTD (ADI-FDTD) method and AH-FDTD method are used to realize the improved UPML absorbing boundary, and the absorption effects of the three methods are compared from two aspects of 2 norm error and infinite norm error. Simulation results show that the improved UPML based on AH-FDTD method has better absorption effect for low-frequency wave groups. © 2022 IEEE.

关键词： Transient analysis

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