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Fabrication of Bi(2223)/Ag Superconducting Tapes withRectangular Cross Section by Hydrostatic Extrusion

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Journal of Materials Science & Technology 1998年第4期14卷 374-376页

作者： Ma, Yanwei wang, xianjin wang, Zutang Univ Sci & Technol Beijing Dept Met Forming Beijing 100083 Peoples R China Tsing Hua Univ Beijing 100084 Peoples R China

Ag-sheathed Bi-2223 superconducting tapes with rectangular cross section were fabricated by hydrostatic extrusion. Microstructural analysis, microhardness measurement and X-ray diffraction have been carried out. The field dependence of the critical current density was investigated at 77 K. The rectangular shaped specimens show a higher density of oxide core, better grain alignment and less weak-linked microstructure compared with the traditional specimens. (Edited author abstract) 10 Refs.

关键词： Superconducting films

HOT PRESSING AND ITS DEFORMATION MECHANISM OF Ag-SHEATHED DPSCCO SUPERCONDUCTING TAPES

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中国有色金属学会会刊：英文版 1998年第1期8卷 89-92页

作者： Ma, Yanwei wang, xianjin wang, Zutang Univ of Science and Technology Beijing Beijing China

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ＨＯＴＰＲＥＳＳＩＮＧＡＮＤＩＴＳＤＥＦＯＲＭＡＴＩＯＮＭＥＣＨＡＮＩＳＭＯＦＡｇＳＨＥＡＴＨＥＤＤＰＳＣＣＯＳＵＰＥＲＣＯＮＤＵＣＴＩＮＧＴＡＰＥＳ①ＭａＹａｎｗｅｉ，ＷａｎｇＸｉａｎｊｉｎａｎｄＷａｎｇＺｕｔａｎｇＤｅｐａｒｔｍｅｎｔｏｆＭｅ...

关键词： Ag-sheathed superconducting tapes hot pressing deformation mechanismcritical current density

Permanence of Metric Sparsification Property under Finite Decomposition Complexity

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Chinese Annals of Mathematics,Series B 2014年第5期35卷 751-760页

作者： Qin wang Wenjing wang xianjin wang Research Center for Operator Algebras Department of Mathematics East China Normal University Department of Applied Mathematics Donghua University College of Mathematics and Statistics Chongqing University

The notions of metric sparsification property and finite decomposition complexity are recently introduced in metric geometry to study the coarse Novikov conjecture and the stable Borel conjecture. In this paper, it is proved that a metric space X has finite decomposition complexity with respect to metric sparsification property if and only if X itself has metric sparsification property. As a consequence, the authors obtain an alternative proof of a very recent result by Guentner, Tessera and Yu that all countable linear groups have the metric sparsification property and hence the operator norm localization property.

关键词： Metric space Metric sparsification Asymptotic dimension Decomposi- tion complexity Permanence property

Remarks on the Operator Norm Localization Property

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Chinese Annals of Mathematics,Series B 2011年第4期32卷 593-604页

作者： xianjin wang Department of Applied Mathematics Donghua University Shanghai 201620 China.

The author studies the metric spaces with operator norm localization property. It is proved that the operator norm localization property is coarsely invariant and is preserved under certain infinite union. In the case... 详细信息

关键词： Metric space Asymptotic dimension Operator norm localization Coarse invariance Roe algebra

Property A and Uniform Embeddability of Metric Spaces Under Decompositions of Finite Depth

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Chinese Annals of Mathematics,Series B 2010年第1期31卷 21-34页

作者： Yujuan DUAN Qin wang xianjin wang Department of Applied Mathematics Donghua University Shanghai 201620 China Corresponding author. Department of Applied Mathematics Donghua University Shanghai 201620 China

Property A and uniform embeddability are notions of metric geometry which imply the coarse Baum-Connes conjecture and the Novikov *** this paper,the authors prove the permanence properties of property A and uniform em... 详细信息

关键词： Metric space Uniform embedding Property A Large scale decomposition Permanence property

Fixture Locating Modelling and Optimization Research of Aluminum Alloy Sidewall in a High-Speed Train Body

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Journal of Shanghai Jiaotong university(Science) 2020年第6期25卷 706-713页

作者： wang xianjin GAO Xu YU Kuigang School of Mechanical Engineering Shandong UniversityJinan 250061China Key Laboratory of High Eficiency and Clean Mechanical Manufacturing of Ministry of Education Shandong UniversityJinan 250061China National Demonstration Center for Experimental Mechanical Engineering Education Shandong UniversityJinan 250061China

The high-speed train body is welded with aluminum alloy assemblies or *** to the material properties,the welding deformation is much *** order to control the welding deformation,this paper takes the sidewall welding of a high-speed train body as the research objective,and carries out the fixture locating modelling and optimization research of the aluminum alloy ***,a finite element model of the sidewall is established and verified by the comparison between the analysis results and the actual measurement *** the residual stress and deformation of the sidewall after welding are *** selecting the longitudinal parameters of different fixture locating layouts for welding analysis,models describing the relat ionship between the maximum welding residual stress and maximum welding deformation and the longitudinal fixture locating distance of the sidewall are ***,the fixture locating model of welding deformation is used to optimize the longit udinal fixture locating *** the transverse fixture locating distance is also optimized by comparing different locating *** result shows that the welding residual stress and the welding deformation have been decreased in the optimal fixture locat ing layout.

关键词： aluminum alloy sidewall welding residual stress welding deformation fixture design

Dislocation Densites of Deformed Steel Sheets Based on Positron Annihilation

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International Journal of Minerals,Metallurgy and Materials 1998年第1期12卷 47-50页

作者： Yonglin Kang xianjin wang (Materials Science and Engineering School, University of Science and Technology Beijing, Beijing 100083, China) Materials Science and Engineering School University of Science and Technology Beijing Beijing 100083 China

The variation regularity of dislocation densites of some deformed steel sheets under three kinds of strainpaths as uniaxial tension, plane strain and equal biaxial stretching was investigated by means of positron lifetimespectrum and Doppler-broadening techniques. The results show that the increasing rate of dislocation densites isrelated to the plastic strain path. A relationship between the increasing rate of micro-defects, macro-instability andforming limits during the process of steel sheet forming was got based on analyzing the mechanism of dislocationdensity increasing under different stress-strain condihons.

关键词： positron annihilation dislocation steel sheet strain path

Annealing Texture Evolution of Ti-IF Steel during Batch Annealing

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International Journal of Minerals,Metallurgy and Materials 1998年第3期12卷 175-179页

作者： Jing Shi xianjin wang(Material Science and Engineering School, University of Science and Technology Beijing, Beijing 100083, China) Material Science and Engineering School University of Science and Technology Beijing Beijing 100083 China

Texture development and recrystallization behavior of Ti-IF steel during Batch Annealing (BA) were investigared with X-ray diffraction and EBSP in lab, and the results were compared with research work on continu ous annealing (CA) with rapid heating rate. The basic tendencies are similar that eary nucleation takes place in ND fibers, RD fibers are consumed at the end of recrystallization, and ND texture dominates over annealing texture. However, the detailed texture transformation during batch annealing is different and somewhat more compicated than tha in rapid-heating process. Moreover, misorientation plays an important role in texture transformation of BA In addition, the results of EBSP are consistent with that of ODF well.

关键词： Ti-IF steel texture batch annealing X-ray diffraction EBSP

Surface modulation of halide perovskite films for efficient and stable solar cells

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Chinese Physics B 2022年第3期31卷 24-35页

作者： Qinxuan Dai Chao Luo xianjin wang Feng Gao Xiaole Jiang Qing Zhao Key Laboratory of General Chemistry of the National Ethnic Affairs Commission School of Chemistry and EnvironmentSouthwest Minzu UniversityChengdu 610041China State Key Laboratory for Mesoscopic Physics and Frontiers Science Center for Nano-optoelectronics School of PhysicsPeking UniversityBeiing 100871China Peking University Yangtze Delta Institute of Optoelectronics Nanong 226010China

As the main distribution place of deep-level defects and the entrance of water, the interface is critical to determining both the power conversion efficiency(PCE) and the stability of perovskite solar cells(PSCs). Suitable interface design can dramatically passivate interface defects and optimize energy level alignment for suppressing the nonradiative recombination and effectively extracting the photogenerated carriers towards higher PCE. Meanwhile, a proper interface design can also block the interface diffusion of ions for high operational stability. Therefore, interface modification is of great significance to make the PSCs more efficient and stable. Upon optimized material choices, the three-dimensional halide perovskite graded junction layer, low-dimensional halide perovskite interface layer and organic salt passivation layer have been constructed on perovskite films for superior PSCs, yet a systematic review of them is missing. Thus, a guide and summary of recent advances in modulating the perovskite films interface is necessary for the further development of more efficient interface modification.

关键词： perovskite solar cells interfacial engineering surface modulation organic salt surface layer