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Juan Yao,Guotao Lin,Zhenxi Du,Jun Liang,Huan He,Xiaoming Shen,Yuechun Fu 대한금속·재료학회 2021 ELECTRONIC MATERIALS LETTERS Vol.17 No.4
ZnO nanowires (ZnO NWs) were synthesized by hydrothermal method on Si (100) substrates, in which an insulating MgOlayer deposited using sol–gel method was inserted between the seed layer and Si substrate. The eff ects of MgO layer on themicrostructure, luminescence and electrical properties of ZnO NWs as well as n-ZnO NWs/p-Si heterojunction LEDs wereinvestigated. With the insertion of MgO layer, well-aligned ZnO NWs with good crystalline quality are obtained, which canbe attributed to the smooth seed layer with homogeneous globular particles. The electroluminescence spectra of n-ZnO NWs/MgO/p-Si heterojunction LEDs exhibit a broad emission band from near ultraviolet to yellow-green region. n-ZnO NWs/MgO/p-Si heterojunction also shows an enhanced ultraviolet photoluminescence effi ciency, and its defect-related visibleemission is greatly suppressed compared with that of n-ZnO NWs/p-Si heterojunction. The current–voltage curves of bothheterojunction LEDs present a typical rectifying behavior, but the rectifi cation ratio increases almost 5 times by insertingMgO layer, which is ascribed to a reduction in the leakage current under reverse bias voltage.
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Strain rate effect of steel-concrete composite panel indented by a hemispherical rigid body
Weiyi Zhao,Lin Wang,Guotao Yang,Ziguo Wang,Zepeng Gao,Quanquan Guo 국제구조공학회 2020 Steel and Composite Structures, An International J Vol.36 No.6
This paper presents numerical and theoretical investigations on the strain rate in steel-concrete composite (SC) panels under low-velocity impact of a hemispherical rigid body. Finite element analyses were performed on five specimens with different loading rates. The impact energy was kept constant to eliminate its influence by simultaneously altering the velocity and mass of the projectile. Results show that the strain rate in most parts of the specimens was low and its influence on bearing capacity and energy dissipation was limited in an average sense of space and time. Therefore, the strain rate effect can be ignored for the analyses of global deformation. However, the strain rate effect should be considered in local contact problems. Equations of the local strain and strain rate were theoretically derived.
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