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Experimental investigation of axial tensile and fatigue behaviors of HTS round strands

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Superconductivity 2023年第4期8卷 69-78页

作者： x.q.Lai J.x.Zuo x.B.Hu T.Zhang J.D.liu P.Y.li Southwestern Institute of Physics(SWIP) P.O.Box 432Chengdu 610041PR China Southwestern Institute of Physics ChengduSichuanPR China

For the development of high‐temperature superconducting(HTS)magnet systems of future fusion devices,a novel HTS round strand based on a stacking structure was designed and manufactured using second generation(2G)HTS *** mechanical loads during operation can result in irreversible degradation of the *** axial tension and fatigue loads need particular ***,it is important to investigate the electromechanical behavior of the round strand under various axial tension and cyclic *** this paper,the axial tensile and fatigue tests were conducted at 77 K,self‐*** 95%critical current(I_(c))retention as the criterion,the results of the tensile tests revealed that the average tensile stress and strain were as high as 344 MPa and 0.47%,*** characteristics were also investigated as a function of axial tensile *** significant performance degradation was observed up to 100,000 loading cycles with stress amplitudes ranging from 20 MPa to 200 *** degradation occurs after 16,000 loading cycles with 380 MPa as the maximum ***,the microscopic defects of the round strand samples due to fabrication imperfections and mechanical loading were investigated using metallographic microscope and scanning electron *** results presented in this paper are useful for comprehending and improving the mechanical behaviors of the strand in high‐field and large‐scale fusion magnet systems.

关键词： High‐temperature superconducting High‐field magnet Round strands Axial tensile and fatigue Microscopic defects

WIDE-BAND LASER CLADDING: WEAR AND CORROSION RESISTANCE OF A Ni-BASED ALLOY

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Acta Metallurgica Sinica(English Letters) 1997年第5期10卷 445-452页

作者： Pan, q.Y. Huang, W.D. li, Y.M. lin, x. Zhou, Y.H. Yang, x.C. Northwestern Polytechnical Univ Xi'an China

A novel wide-band laser cladding system, with high rate of cladding, has been developed in the present work. The system mainly consisted of a 5kW CO2 laser, an automatic powder feeder and a wide-band scanning rotative polygon mirror which can produce a linear or rectangular focused laser beam. Using this system, a Ni-Cr-Si-B alloy powder was cladded on the surface of type 321 austenitic stainless steel in order to improve its wear and corrosion resistance. The pitting corrosion, high temperature oxidation and wear tests were conducted in order to evaluate the properties of the laser cladded layer. The results demonstrated that the cladded layer can significantly improve the adhesive wear and pitting corrosion resistance of the substrate. Moreover, the cladded layer exhibited good oxidation resistance, which is almost the same as that of GMR-235D Ni-based superalloy.

关键词： Boron Chromium alloys Cladding (coating) Laser applications Nickel alloys Silicon alloys Wear resistance

3D－qSAR　STUDY　ON　HUPERZINE　A　ANALOGS　WITH　MOLECULAR　MODEliNG　AND　COMPARATIVE　MOLECULAR　FIELD　ANALYSIS（COMFA）　METHODS

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Chinese Chemical Letters 1996年第3期7卷 253-256页

作者： Jiang, HL Chen, Kx Chen, JZ Tang, Y Wang, qM li, q Shen, x Ji, RY CHINESE ACAD SCI SHANGHAI INST MAT MEDSHANGHAI 200031PEOPLES R CHINA

On the basis of conformational search for ten huperzine A analogs according to the structure ofAChE active site witll our approach BCSPL,we performed a 3D-qSAR analysis for these compounds usingmolecular modeling and CoMFA method. The calculation results can be used to explain the relationshipbetween the structUre properties and the activities.

关键词： qSAR STUDY ON HUPERZINE ANALYSIS ANALOGS

MOLECULAR　MECHANICAL　AND　qUANTUM　CHEMICAL　CALCULATION　ON　ACYLATION　REACTIVITY　FOR　1－（NITRO　SUBSTITUTED　ANIliNO）－4－SUBSTITUTED－2，6－PIPERAZINEDIONES

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Chinese Chemical Letters 1995年第8期6卷 691-694页

作者： Jiang, HL li, q Chen, Kx Tang, Y Shen, x Ji, RY xie, YY Chinese Acad Sci Shanghai Inst Mat Med Shanghai 200031 Peoples R China

Molecular mechanical and quantum chemical methods were used to calculate the conformational and electronic structures of the template molecules of (nitro substituted an ill no)-4 - sub st nut ed -2, 6 -piperazinediones, With the calculation results we explained the acylation reactivity of title compounds satisfactorily.

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Influence of an Electronic Field on the GMI Effect of Fe-based Nanocrystalline Microwire

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Nano-Micro Letters 2013年第1期5卷 13-17页

作者： q.Zhang D.L.Chen x.li P.x.Yang J.H.Chu Z.J.Zhao Key Laboratory of Polar Materials and Devices Ministry of EducationDepartment of Electronic EngineeringEast China Normal University Engineering Research Center for Nanophotonics & Advanced Instrument Ministry of EducationDepartment of PhysicsEast China Normal University

In this work, a Fe-based nanocrystalline microwire of 20 mm in length and 25 μm in diameter was placed in the center of a 316 stainless steel pipe. The pipe was 500 μm in diameter and a little shorter than the microwire. A series of voltages were applied on the pipe to study the influence of the electrical field on the Giant-Magneto-Impedance(GMI) effect of the microwire. Experimental results showed that the electronic field between the wire and the pipe reduced the hysteresis of the GMI effect. The results were explained based on equivalent circuit and eddy current consumptions analysis.

关键词： GMI Eddy consumptions Electronic field Equivalent circuit

A Dynamic Knowledge Base Updating Mechanism-Based Retrieval-Augmented Generation Framework for Intelligent question-and-Answer Systems

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Journal of Computer and Communications 2025年第1期13卷 41-58页

作者： Yu li Technical Research Center China Datang Digital Technology Co. Ltd. Baoding China School of Mechanical Engineering Xian Jiaotong University Xian China

In the context of power generation companies, vast amounts of specialized data and expert knowledge have been accumulated. However, challenges such as data silos and fragmented knowledge hinder the effective utilization of this information. This study proposes a novel framework for intelligent question-and-Answer (q&A) systems based on Retrieval-Augmented Generation (RAG) to address these issues. The system efficiently acquires domain-specific knowledge by leveraging external databases, including Relational Databases (RDBs) and graph databases, without additional fine-tuning for Large Language Models (LLMs). Crucially, the framework integrates a Dynamic Knowledge Base Updating Mechanism (DKBUM) and a Weighted Context-Aware Similarity (WCAS) method to enhance retrieval accuracy and mitigate inherent limitations of LLMs, such as hallucinations and lack of specialization. Additionally, the proposed DKBUM dynamically adjusts knowledge weights within the database, ensuring that the most recent and relevant information is utilized, while WCAS refines the alignment between queries and knowledge items by enhanced context understanding. Experimental validation demonstrates that the system can generate timely, accurate, and context-sensitive responses, making it a robust solution for managing complex business logic in specialized industries.

关键词： Retrieval-Augmented Generation question-and-Answer Large Language Models Dynamic Knowledge Base Updating Mechanism Weighted Context-Aware Similarity

Influence of Co Content on Raman and Photoluminescence Spectra of Co Doped ZnO Nanowires

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Journal of Materials Science & Technology 2012年第4期28卷 313-316页

作者： Y.q. Chang P.W. Wang S.L. Ni Y. Long x.D. li School of Materials Science anti Engineering University of Science and Technology Beijing Beijing 100083 China Department of Physics National Key Laboratory of Mesoscopic Physics Peking University Beijing 100871 China

Co doped ZnO nanowires with different Co contents have been fabricated by a chemical vapor deposition method. x-ray diffraction results show that all the samples are of single phase and crystallize in wurtzite ZnO structure. The lattice parameter a increases with increasing Co content, while the parameter c has no obvious change with increasing Co. Raman spectra show that the nonpolar E2（High） mode becomes broad and weak with the doping of Co, which indicates that the incorporation of Co causes structural disorder in the crystalline columnar ZnO lattice. The photolurninescence spectra exhibit that the position of the ultraviolet emission shifts to short wavelength and the intensity decreases with increasing Co. The green emission is affected by two contrary factors. It is increased by the introduced defects, but suppressed by the interaction between Co doping and native defects and the later affects it more significantly.

关键词： Co doped ZnO nanowires Raman Photoluminescence Single phase

PROPERTIES OF MgB_2 FILMS FABRICATED ON COPPER CATHODES BY ELECTROCHEMICAL TECHNIqUE

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Acta Metallurgica Sinica(English Letters) 2008年第5期21卷 351-354页

作者： H.Z. Yang x.G. Sun W.q. Huang M.L. li x.M. Yu B.S. Zhang Y. qi q. Zhao Institute of Materials Physics and Chemistry School of Sciences Northeastern University Shenyang 110004 China Key Laboratory for Anisotropy and Texture of Materials Ministry of Education Northeastern University Shenyang 110004 China Department of Applied Physics School of Sciences Shenyang University of Technology Shenyang 110178 China

An electrochemical technique has been introduced and applied to fabricate superconducting MgB2 films in molten salts. MgCl2, Mg（BO2）2, NaCl, and KCl were used as electrolyte, graphite was used as the anode, and copper was used as the cathode, respectively. x-ray diffraction （xRD） analysis was chosen to investigate the phase composition and crystallinity of the films at different electrolysis temperatures. Stan- dard four-probe technique and SqUID were applied to investigate the temperature dependence of resistance （R-T） properties and magnetic properties of the films, respectively. The results indicate that MgB2 films have been fabricated on the copper cathodes, and superconducting transition takes place close to 50 K.

关键词： MgB2 film Electrochemistry Cu cathode

Microstructural Evolution and Service Performance of Cold-drawn Pure Aluminum Conductor Wires

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Journal of Materials Science & Technology 2017年第9期33卷 1039-1043页

作者： x.M.Luo Z.M.Song M.L.li q.Wang G.P.Zhang Shenyang National Laboratory for Materials Science Institute of Metal ResearchChinese Academy of Sciences

Microstructures and service performance(mechanical and electrical properties) of the commercially pure Al conductor wires subjected to different cold drawing strains were investigated. The results show that the microstructures of the cold-drawn Al wires along the radial direction were inhomogeneous, i.e. the texture in the center region was strong and weak components, while that in the surface region shifted from the initial cubic texture to a component and finally developed into a strong component. The volume fraction of the high angle grain boundaries in the surface region was higher than that in the center region. The cold-drawing process greatly enhanced the yield strength of the pure Al wires while retained the acceptable electrical resistivity. The strengthening mechanism and the variation of electrical conductivity of the cold-drawn Al wires are discussed through correlating with microstructure evolution.

关键词： Cold drawing Aluminum Microstructure Strength Conductivity