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RISS 인기검색어
- 검색키워드
- 저자 : Weigang Lu (검색결과 5 건)
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Weigang Zhao,Lu Luo,Mizi Fan 성균관대학교(자연과학캠퍼스) 성균나노과학기술원 2017 NANO Vol.12 No.1
New monolithic nitrogen-containing microporous cellular activated carbon was successfully prepared from phenol-urea-formaldehyde (PUF) organic foam for CO2 and H2 adsorption and was characterized by thermogravimetric analysis (TG), scanning electron microscope (SEM), Fourier transform infrared spectroscopy (FTIR), elemental analysis (EA), a mechanical testing machine, N2-sorption and H2/CO2 sorption. The carbon yield was approximately 50% for carbonization and the burn off for activation ranged from 40% to 56%, which linearly increased with activation time. The macroporosity corresponded to the connected network of cells with diameters ranging from 100 µm to 600 µm, and the pinholes in the cell walls had diameters ranging from 1 µm to 2 µm. The micro/mesoporosity is located at the inner surface of the cells. Thus, higher adsorption kinetics than usual from activated carbon are expected. The developed carbon with the highest SBET (1674 m2 /g) and highest VDR (0.86 cm3 /g) contained 1.5% nitrogen, had a CO2 adsorption capacity of 3.53 mmol/g at 298 K, and had an H2 adsorption capacity of 1.9 wt.% at 77 K, both at atmospheric pressure (1 bar), which were among the best in activated carbons from physical activation.
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Optimization Design of Stainless Steel Stamping Multistage Pump Based on Orthogonal Test
Weidong, Shi,Chuan, Wang,Weigang, Lu,Ling, Zhou,Li, Zhang Korean Society for Fluid machinery 2010 International journal of fluid machinery and syste Vol.3 No.4
Stainless steel stamping multistage pump has become the mainstream of civil multi-stage pump. Combined with the technological features of stamping and welding pump, the studies of design for hydraulic parts of pump were come out. An $L_{18}$($3^7$)orthogonal experiment was designed with seven factors and three values including blade inlet angle, impeller outer diameter, guide vane blade number, etc. 18 plans were designed. The two stage of whole flow field on stainless steel stamping multistage pump at design point for design was simulated by CFD. According to the test result and optimization design with experimental research, the trends of main parameters which affect hydraulic performance were got. After being manufactured and tested, the efficiency of the optimal model pump reaches 61.36% and the single head is more than 4.8 m. Compared with the standard efficiency of 53%, the design of the stainless steel stamping pump is successful. The result would be instructive to the design of Stainless steel stamping multistage pump designed by the impeller head maximum approach.
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Wenjie Ge,Ashraf F. Ashour,Weigang Lu,Dafu Cao 한국콘크리트학회 2020 International Journal of Concrete Structures and M Vol.14 No.2
Experimental and theoretical investigations on the flexural performance of steel reinforced ECC-concrete composite beams subjected to freeze-thaw cycles are presented in this paper. Four groups of reinforced composite beams with different ECC height replacement ratios subject to 0, 50, 100 and 150 cycles of freeze-thaw were physically tested to failure. Experimental results show that the bending capacity decreases with the increase of freeze-thaw cycles regardless of ECC height replacement ratios. However, the ultimate moment, stiffness and durability of ECC specimens and ECC-concrete composite specimens are greater than those of traditional concrete specimens, owing to the excellent tensile performance of ECC materials. With the increase of ECC height, the crack width and average crack spacing gradually decrease. According to materials’ constitutive models, compatibility and equilibrium conditions, three failure modes with two boundary failure conditions are proposed. Simplified formulas for the moment capacity are also developed. The results predicted by the simplified formulas show good agreement with the experimental moment capacity and failure modes. A parametric analysis is conducted to study the influence of strength and height of ECC, amount of reinforcement, concrete strength and cycles of freeze-thaw on moment capacity and curvature ductility of ECC-concrete composite beams.
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Design and performance research of a mixed-flow submersible deep well pump
Zhang, Qihua,Xu, Yuanhui,Cao, Li,Shi, Weidong,Lu, Weigang Korean Society for Fluid machinery 2016 International journal of fluid machinery and syste Vol.9 No.3
To meet the demand of higher handling capacity, a mixed-flow submersible deep well pump was designed and tested. The main hydraulic components are made of plastics, which is free of erosion, light-weight, and environment-friendly. To simplify plastic molding process, and to improve productivity, an axial-radial guide vane was proposed. To clarify its effect on the performance, a radial guide vane and a space guide vane are developed as well. By comparison, the efficiency of the pump equipped with the axial-radial guide vane is higher than the radial guide vane and is lower than the space guide vane, and its high efficiency range is wide. The static pressure recovery of the axial guide vane is a bit lower than the space guide vane, but it is much larger than the radial guide vane. Taking the cost and molding complexity into consideration, the axial-radial guide vane is much economic, promoting its popularity for the moderate and high specific speed submersible deep well pumps.
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Design and performance research of a mixed-flow submersible deep well pump
Qihua Zhang,Yuanhui Xu,Li Cao,Weidong Shi,Weigang Lu 한국유체기계학회 2016 International journal of fluid machinery and syste Vol.9 No.3
To meet the demand of higher handling capacity, a mixed-flow submersible deep well pump was designed and tested. The main hydraulic components are made of plastics, which is free of erosion, light-weight, and environment-friendly. To simplify plastic molding process, and to improve productivity, an axial-radial guide vane was proposed. To clarify its effect on the performance, a radial guide vane and a space guide vane are developed as well. By comparison, the efficiency of the pump equipped with the axial-radial guide vane is higher than the radial guide vane and is lower than the space guide vane, and its high efficiency range is wide. The static pressure recovery of the axial guide vane is a bit lower than the space guide vane, but it is much larger than the radial guide vane. Taking the cost and molding complexity into consideration, the axial-radial guide vane is much economic, promoting its popularity for the moderate and high specific speed submersible deep well pumps.
ScienceON
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