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RISS 인기검색어
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- 저자 : Guoying Feng (검색결과 4 건)
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Optical Properties of a Nanofiber with Metal Cladding
Guoying Feng,Hao Zhou,Guorui Zhou,Hao Yang,Guoliang Deng,Shouhuan Zhou 한국물리학회 2011 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.58 No.41
We present a detailed report on the linear and the nonlinear optical properties of a nanofiber with metal cladding fabricated by using a flame stretch method and a vacuum deposition method. We numerically simulated the field distribution in a tapered nanofiber with different thicknesses of silver cladding. The results show that, due to the high-index contrast between the silica core and the silver cladding, the silica waveguide allows strong optical confinement and large effective nonlinearity. The supercontinuum generation based on a nanofiber with metal cladding is investigated theoretically and experimentally.
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Di Feng,Guoying Wang,Hongmei Chen,XinMing Zhang 대한금속·재료학회 2018 METALS AND MATERIALS International Vol.24 No.1
The effect of grain size inhomogeneity of large ingot on the hot deformation behavior of Al-8Zn-2Mg-2Cu alloywere investigated using hot compression tests over a temperature range from 300 °C to 450 °C with strain rate from0.1 s-1to 10 s-1. It was found that the grain size (100 μm) in surface layer of the ingot is finer than that of the centrallayer (>200 μm). The surface specimen exhibited lower flow stress than that of central one in the temperature rangefrom 350 °C to 450 °C and the strain rate range from 0.1 s-1to 1 s-1. The softening mechanism is dynamic recovery,together with a partial dynamic recrystallization (DRX) at high temperature and low strain rate condition regardlessthe grain size. The nucleation mechanism of DRX is the strain induced grain boundary migration. Therefore,the DRX fraction is higher in surface specimen because the higher grain boundary density provides more nucleationsites. Based on processing maps, the applicable hot deformation parameters for the large size ingot are determinedto be at the temperature range of 440-450 °C and the strain rate of 0.1-0.3 s-1when taking the grain sizeinhomogeneity into account.
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First-principles analysis of the absorption and luminescence properties of Cr2+-doped ZnSe crystal
Yuqin Zhang,Guoying Feng,Shenyu Dai,Shougui Ning,Shouhuan Zhou 한국물리학회 2016 Current Applied Physics Vol.16 No.5
The electronic band structure, absorption and luminescence properties of Cr2+-doped ZnSe crystal have been investigated by first-principles calculations on the basis of density functional theory. Firstprinciples calculations were carried out using the Vienna Ab-initio Simulation Package (VASP). It is shown that isolated impurity bands that mainly made up of Cr(d) orbitals are created in the band gap with the doping of Cr2+ ions. The Cr(d) orbitals are split into e and t2 groups because of the potential of the crystal. Theoretical absorption and luminescence spectra are calculated and compared with experimental data. An appropriate explanation of the experimental spectra is presented.
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Chenwei Li,Guoying Feng,Zhiguo Yan,Shaoping Li,Man Xu,Cunwen Wang,Yanbo Li 한국공업화학회 2022 Journal of Industrial and Engineering Chemistry Vol.116 No.-
Incorporation of nanofillers is an option to break through the trade-off of nanofiltration membranes. Inthe present work, a simultaneous synthesis method, ZIF and selective layer formed in one step, was proposedto prepare hybrid nanofiltration membrane. Co2+ ions pre-assembled on hydrolyzed polyacrylonitrile(PANH) support provided nucleation sites for ZIF-67 formation. The growth of ZIF-67 and theformation of polyethyleneimine (PEI) selective layer on the support completed in one step through codepositingof a solution of PEI and Hmim (2-methylimidazole). The feasibility of the simultaneous synthesismethod was verified by using different supports, PEIs, and the precursor concentrations. All resultsshow that ZIF-67 incorporation improved the water permenace, without significant compromising ofmembrane rejection. At an optimized condition, the obtained hybrid composite membrane showed highpermeance of 35 L/(m2*h*bar) and rejection of 93% toward PEG 200. The permeance increased by about150%–200% compared with the membrane without ZIF-67. Meanwile, the rejections of salts of the hybridmembrane were very low, exhibiting outstanding organic selectivity.
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