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determination of Natural Frequencies and Mode Shapes of Circular Arches Using a Strain-based Curved Element

河南理工大学学报(自然科学版) 1997年第1期 33-42页

作者： d.b.tann r.delpak (department of Civil Engineering and building, University of Glamorgan, Pontypridd, CF37 1dL, United Kingdom)

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关键词： natural frequency mode shape explicit formulation circular arches extensional-flexural deformation strain energy

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Influence of Al_2O_3 particle pinning on thermal stability of nanocrystalline Fe

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Journal of Materials Science & Technology 2018年第4期34卷 599-604页

作者： G.b.Shan Y.Z.Chen M.M.Gong H.dong b.Li F.Liu State Key Laboratory of Solidification Processing Northwestern Polytechnical University

Second-phase particle pinning has been well known as a mechanism impeding grain boundary （Gb） migration, and thus, is documented as an efficient approach for stabilizing nanocrystalline （NC） materials at elevated temperatures. The pinning force exerted by interaction between small dispersed particles and Gbs strongly depends on size and volume fraction of the particles. Since metallic oxides, e.g. Al2O3, exhibit great structural stability and high resistance against coarsening at high temperatures, they are expected as effective stabilizers for NC materials. In this work, NC composites consisting of NC Fe and Al2O3 nanoparticIes with different amounts and sizes were prepared by high energy ball milling and annealed at various temperatures （tann） for different time periods （tann）. Microstructures of the ball milled and annealed samples were examined by X-ray diffraction and transmission electron microscopy. The results show that the addition of Al2O3 nanoparticles not only enhances the thermal stability of NC Fe grains but also reduces their coarsening rate at elevated temperatures, and reducing the particle size and/or increasing its amount enhance the stabilizing effect of the Al2O3 particles on the NC Fe grains.

关键词： Iron Nanocrystalline materials ball milling Zener pinning Grain growth Thermal stability

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Candidate revolving Chiral doublet bands in^(119)Cs

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IMP & HIrFL Annual report 2022年第1期 32-33页

作者： Zheng Kuankuan Costel Petrache Zhang Zhenhua Alain Astier Lv bingfeng Paul Greenlees Tuomas Grahn rauno Julin Sanna Juutinen Minna Luoma Jari Ojala Janne Pakarinen Juho Partanen Paavo rahkila Panu ruotsalainen Mikael Sandzelius Jan Saren Holly tann Juha Uusitalo George Zimba bo Cederwall Ozge Aktas Aysegul Ertoprak Zhang Wei Guo Song Liu Minliang Zhou Xiaohong Istvan Kuti b.M.Nyako d.Sohler J.Timar Corina Andreoiu Maria doncel david Joss robert Page Universite Paris-Saclay CNRS/IN2P3IJCLab91405 OrsayFrance Institute of Modern Physics Chinese Academy of SciencesLanzhou 730070China Mathematics and Physics department North China Electric Power UniversityBeijing 102206China University of Jyvaskyla Department of PhysicsP.O.Box 35FI-40014University of JyvaskylaFinland Oliver Lodge Laboratory Department of PhysicsUniversity of LiverpoolLiverpool L697ZEUnited Kingdom KTH department of Physics S-10691 StockholmSweden Institute for Nuclear research(Atomki-ELKH) 4001 DebrecenHungary department of Chemistry Simon Fraser UniversityBurnabyBC V5A 1S6Canada

The chiral bands built on a con guration with only protons in the transient backbending regime was also observed for the rst time in^(119)Cs^([1]).One newly observed band(band 9)which is nearly degenerate to the strongly-coupled g9=2[404]9=2^(+)band of 119Cs was identi *** exhibits a backbending similar to that of known band(band 8),at nearly constant rotation frequency.

关键词： bending rotation degenerate

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