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Fan-Qin Meng,Mei-Chun Zhu,G. Charles Clifton,Kingsley U. Ukanwa,James B.P. Lim 국제구조공학회 2021 Steel and Composite Structures, An International J Vol.41 No.1
The steel-reinforced concrete-filled steel tubular column (SRCFT) is a new form of composite columns. Before widely accepted in engineering practice, its fire behaviour shall be fully understood. Four representative circular SRCFT stub columns were built and tested to failure under ISO fire herein. The tests explored the effect of reinforced steel, the internal or external heating condition and load ratios. The experimental results indicated that the inserted section steel significantly improved the fire resistance of circular SRCFT columns. The non-uniform fire condition did not produce a detrimental effect on the fire response of the specimen. The numerical model was developed and validated against the experimental results. Then a parametric study was present to evaluate the effect of load level, eccentricity and heating conditions. A comparison was made to check the accuracy of a widely accepted design method. The comparison indicated the design method was generally 36% conservative for axially loaded condition and 25% un-conservative for eccentrically loaded condition.
Jie Fan,Meng-Yan Yu,Tong-da Lei,Yong-Heng Wang,Fu-Yuan Cao,Xiao Qin,Yong Liu 한국조직공학과 재생의학회 2018 조직공학과 재생의학 Vol.15 No.2
A rapid freezing/lyophilizing/reinforcing process is suggested to fabricate reinforced keratin/hydroxyapatite (HA) scaffold with improved mechanical property and biocompatibility for tissue engineering. The keratin, extracted from human hair, and HA mixture were rapidly frozen with liquid nitrogen and then lyophilized to prepare keratin/HA laminar scaffold. The scaffold was then immersed in PBS for reinforcement treatment, and followed by a second lyophilization to prepare the reinforced keratin/HA scaffold. The morphology, mechanical, chemical, crystal and thermal property of the keratin/HA scaffold were investigated by SEM, FTIR, XRD, DSC, respectively. The results showed that the keratin/HA scaffold had a high porosity of 76.17 ± 3%. The maximum compressive strength and compressive modulus of the reinforced scaffold is 0.778 and 3.3 MPa respectively. Subcutaneous implantation studies in mice showed that in vivo the scaffold was biocompatible since the foreign body reaction seen around the implanted scaffold samples was moderate and became minimal upon increasing implantation time. These results demonstrate that the keratin/HA reinforced scaffold prepared here is promising for biomedical utilization.
Huijie Li,Fanming Meng,Jinfeng Gong,Zhenghua Fan,Rui Qin 대한금속·재료학회 2018 ELECTRONIC MATERIALS LETTERS Vol.14 No.4
CeO2 nanospheres with the core–shell nanostructure have been successfully synthesized by a template-free hydrothermalmethod. The structures, morphologies and optical properties of core–shell CeO2nanospheres were analyzed by X-ray diffraction(XRD), TG, Fourier transform infrared spectroscopy, XRD, EDS, SAED, scanning electron microscopy and transmissionelectron microscopy, UV–Vis diffuse reflectance spectra, Raman analyses. The degradation efficiencies of core–shell CeO2nanospheres for methyl orange were as high as 93.49, 95.67 and 98.28% within 160 min, and the rates of photo degradationof methyl orange by core–shell CeO2nanospheres under UV-light were 0.01693, 0.01782 and 0.02375 min−1. Methyl orangewas degraded in photocatalytic oxidation processes, which mainly gave the credit to a large number of reactive species includingh+,surface superoxide species ·O2−, and ·OH radicals. The core–shell structure, small crystallite size and the conversionbetween Ce3+and Ce4+of CeO2nanospheres were of importance for its catalytic activity. These results demonstrated thepossibility of improving the efficient catalysts of the earth abundant CeO2catalysts.