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RISS 인기검색어
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- 저자 : Mingqiang Lin (검색결과 3 건)
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Flexural Performance of Prestressed Composite Recycled Aggregate Slabs with Steel Tube Trusses
Enming Liu,Mingqiang Lin,Qun Xie,Yue Zhang 대한토목학회 2022 KSCE JOURNAL OF CIVIL ENGINEERING Vol.26 No.12
A new type of prestressed composite recycled aggregate floor slab was developed and its flexural performance was studied. The composite floor comprises a top cast-in-place slab made of recycled coarse aggregate concrete and a bottom precast concrete slab with grouted steel tube trusses. The cracking load, ultimate load, deflection, steel tube strain, concrete strain and failure process are studied for different contents of recycled coarse aggregates. Results show that the mechanical performance of the prestressed composite recycled aggregate slab has two distinctive stages. And the load bearing capacity decreases with the increase in the amount of recycled coarse aggregates. When the composite slab fails, the prestressed steel wires in the tension zone yield and concrete in the compression zone is crushed. This failure characteristic reflects that the reinforcement ratio of the component is appropriate. The cracking moment and ultimate moment calculation formulas of the composite slab are established and could predict the cracking and failure points. In the formulas, the influence of the amount of recycled coarse aggregates on the flexural capacity is considered. By controlling the content of recycled aggregates, the composite slabs with steel tube trusses can be sued in practical applications.
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Mi, Longqing,Feng, Yongyi,Cao, Lei,Xue, Mingqiang,Huang, Yanlin,Qin, Lin,Seo, Hyo Jin Elsevier 2018 Spectrochimica acta. Part A, Molecular and biomole Vol.192 No.-
<P><B>Abstract</B></P> <P>Silver-containing lanthanum metaniobate Ag<SUB>0.5</SUB>La<SUB>0.5</SUB>Nb<SUB>2</SUB>O<SUB>6</SUB> nanoparticles were synthesized by sol-gel polymerized complex method. A typical defect-perovskite structure was confirmed by XRD Rietveld refinements. The surface characteristics of the sample were tested by SEM, TEM and EDS measurements. SEM and TEM show that the sample presents ball-like particles with the diameters of 100nm to 400nm. The sample shows both self-activated luminescence and photocatalytic activities. Ag<SUB>0.5</SUB>La<SUB>0.5</SUB>Nb<SUB>2</SUB>O<SUB>6</SUB> has a direct transition with band energy of 2.85eV. The Ag4d-O2p hybridization in the valence band contributes to the narrowed band gap. The luminescence properties of Ag<SUB>0.5</SUB>La<SUB>0.5</SUB>Nb<SUB>2</SUB>O<SUB>6</SUB> have been investigated for the first time. The luminescence is characterized by two emission centers with maximum wavelength near 460 and 530nm. The emission and excitation spectra, decay curves and the thermal quenching mechanism were discussed. Ag<SUB>0.5</SUB>La<SUB>0.5</SUB>Nb<SUB>2</SUB>O<SUB>6</SUB> shows the efficient photocatalytic activities and the photodegradation rate for methylene blue dye (MB) can reach about 95% under visible light (>420nm) irradiation in 5h. The trapped experiments for the active species were tested and discussed, which verified that OH radicals could be the major active species in photocatalysis.</P> <P><B>Highlights</B></P> <P> <UL> <LI> A new silver-containing metaniobate Ag<SUB>0.5</SUB>La<SUB>0.5</SUB>Nb<SUB>2</SUB>O<SUB>6</SUB> was synthesized. </LI> <LI> Ag<SUB>0.5</SUB>La<SUB>0.5</SUB>Nb<SUB>2</SUB>O<SUB>6</SUB> has a typical defect-perovskite structure. </LI> <LI> Ag<SUB>0.5</SUB>La<SUB>0.5</SUB>Nb<SUB>2</SUB>O<SUB>6</SUB> shows both self-activated luminescence and photocatalytic activities. </LI> <LI> The mechanisms of luminescence and photocatalysis were elucidated. </LI> </UL> </P> <P><B>Graphical abstract</B></P> <P>[DISPLAY OMISSION]</P>
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Ultrafast epitaxial growth of metre-sized single-crystal graphene on industrial Cu foil
Xu, Xiaozhi,Zhang, Zhihong,Dong, Jichen,Yi, Ding,Niu, Jingjing,Wu, Muhong,Lin, Li,Yin, Rongkang,Li, Mingqiang,Zhou, Jingyuan,Wang, Shaoxin,Sun, Junliang,Duan, Xiaojie,Gao, Peng,Jiang, Ying,Wu, Xiaoson Elsevier 2017 Science bulletin Vol.62 No.15
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