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- 저자 : Guoqiang Yuan (검색결과 3 건)
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Hengda Yuan,Yu Zhang,Guoqiang Lu,Fuping Chen,Tanlong Xue,Xin Shu,Yingying Zhao,Jun Nie,Xiaoqun Zhu 한국공업화학회 2022 Journal of Industrial and Engineering Chemistry Vol.109 No.-
The application of conventional absorbing materials is limited due to complex preparation process andpoor transparency caused by fillers. In this study, a highly transparent ionic organogel was preparedby photocuring a dimethyl sulfoxide (DMSO) solution of a polymerizable magnetic cationic monomer[DAC]5[Dy(NCS)8]. Both components of organogel, which are the photopolymerizable magnetic cationicmonomer and polar solvent DMSO, have an important effect on the magnetic losses and dielectric lossesproperties of the organogel respectively. By tuning the mass ratio of DMSO to the monomer and the contentof the cross-linker, the complex permittivity of the gel could be effectively adjusted to improve theimpedance matching, and finally a gel with excellent wave absorption properties and good tensile propertieswas obtained. The optimum organogel was fabricated with a minimum reflection loss of 45.9 dBand a broadest effective absorption bandwidth (EAB) of up to 5.2 GHz, and effective absorption in the millimeterband (26.5–40 GHz) which is within the fifth generation (5G) mobile networks. With the advantagesof simple preparation method, arbitrary shape and good adhesion to a variety of substrates andcomplex surfaces, this multifunctional gel provides a new solution for complex scenarios requiring opticaltransparency and simultaneous absorption of electromagnetic waves.
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Shengbing Duan,Guoqiang Yuan,Yanli Zhao,Weijia Ni,Hongzhen Luo,Zhongping Shi,Fan Liu 한국화학공학회 2013 Korean Journal of Chemical Engineering Vol.30 No.5
Cephalosporin C (CPC) fermentation by Acremonium chrysogenum is an extremely high oxygen-consuming process and oxygen transfer rate in a bioreactor directly affects fermentation performance. In this study, fluid dynamics and oxygen transfer in a 7 L bioreactor with different impellers combinations were simulated by computational fluid dynamics (CFD) model. Based on the simulation results, two impeller combinations with higher oxygen transfer rate (KLa) were selected to conduct CPC fermentations, aiming at achieving high CPC concentration and low accumulation of major by-product, deacetoxycephalosporin (DAOC). It was found that an impeller combination with a higher KLa and moderate shear force is the prerequisite for efficient CPC production in a stirred bioreactor. The best impeller combination, which installed a six-bladed turbine and a four-pitched-blade turbine at bottom and upper layers but with a shortened impellers inter-distance, produced the highest CPC concentration of 35.77 g/L and lowest DAOC/CPC ratio of 0.5%.
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Effect of Cooling Rate on Magnetic Properties of FeCoNi(CuAl)0.8 High Entropy Alloy
Xiangyun Zhang,Ding Guoqiang,Dong Jiao,ZiZhou Yuan 한국자기학회 2023 Journal of Magnetics Vol.28 No.2
The solidification process of an alloy has a significant influence on its microstructure and properties. In this article, the effect of cooling rate on the microstructure and magnetic properties of the FeCoNi(CuAl)0.8 high entropy alloys (HEAs) was investigated. Results showed that all the samples prepared at different cooling rates exhibited a duplex-phase structure of face-centered cubic (FCC) plus body-centered cubic (BCC). But the volume fraction of BCC and stacking density of the alloy increased with the increasing of cooling rate, leading to an increase in saturated magnetization. Furthermore, microstructure investigation showed that with the increasing of cooling rate, the grain size of the samples decreased, lattice distortion and residual stress increased, and more nanoprecipitates were embedded in the interdendritic phases of the sample, which may be responsible for the increase in coercivity of the alloy.
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