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Wen Guan,Da-Bin Wang 한국전산응용수학회 2010 Journal of applied mathematics & informatics Vol.28 No.3
In this paper, existence criteria of one solution to a nonlinear first-order periodic boundary value problem of impulsive dynamic equation on time scales are obtained by using the well-known Schaefer fixed-point theorem.
Behavior Characteristics of Hydrogen and its Isotope in Molten Salt of LiF-NaF-KF (FLiNaK)
Youshi Zeng,Wenguan Liu,WeiLiu,Yuan Qian,Nan Qian,Xiaoling Wu,Yu Huang,Shengwei Wu,Guanghua Wang 한국원자력학회 2019 Nuclear Engineering and Technology Vol.51 No.2
Experimental studies to investigate the behaviors of hydrogen in molten FLiNaK (LiF-NaF-KF) have beenconducted at 500e700 C. On the basis of previous studies, the diffusivity and solubility of hydrogen inFLiNaK have been revised, and the expressions can be correlated to the following Arrhenius equations:DH2 ¼ 1.62 10 5exp ( 48.20 103/Rg$T) [m2/s] and SH2 ¼ 1.03 10 4exp ( 14.96 103/Rg$T) [mol-H2/m3/Pa], respectively. The behavior characteristics of deuterium in FLiNaK were studied and comparedwith the hydrogen behaviors in FLiNaK. The results showed the behaviors of deuterium were consistencewith the behaviors of hydrogen in FLiNaK. The difference between hydrogen and deuterium has not beenobserved upon the experimental research of the behavior characteristics of hydrogen and deuterium inFLiNaK, which suggested the results obtained here might apply equally to the behavior characteristics oftritium in FLiNaK.
Defects evolution and element segregation of Ni-Mo-Cr alloy irradiated by 30 keV Ar ions
Liu Min,Liu Wenguan,He Xiujie,Gao Yantao,Liu Renduo,Zhou Xingtai 한국원자력학회 2020 Nuclear Engineering and Technology Vol.52 No.8
In present study, TEM foils of Ni-Mo-Cr alloy were directly irradiated with 30 keV Ar ions to allow direct characterization. The defects evolution and element segregation after irradiation were investigated by TEM and HAADF-EDS linear scanning. At low irradiation doses (1.38 and 2.76 dpa), black dots were formed and grew with increasing dose. Complicated defects including peas-shaped dislocation loops, polygon dislocation networks and large loops were visible in samples irradiated to high doses (13.8 and 27.6 dpa). Meanwhile, dislocation channels appeared, in which defects were swept out. Significant Mo depletions at dislocation lines and grain boundaries were induced by irradiation due to large misfits between Mo-Ni atoms and high content of Mo.
Efficient removal of Cr(VI) by spent coffee grounds: Molecular adsorption and reduction mechanism
Yue Hu,Meiting Zhi,Shilin Chen,Wenguan Lu,Yinlong Lai,Xiaobing Wang 한국화학공학회 2022 Korean Journal of Chemical Engineering Vol.39 No.7
Spent coffee ground (SCG), a byproduct from the soluble coffee industry, is usually discarded as waste. Thereutilization of SCG for the removal of toxic heavy metal ions is a novel research direction. Until recently, the molecularadsorption and reduction mechanism of Cr(VI) on SCG was barely investigated. In this study, SCG was used forthe efficient removal of Cr(VI) at a concentration range of 2-100mg/L, with a maximum Cr(VI) uptake up to 36.2mg/g. Structural characterization and ATR-FTIR analysis indicated that SCG possessed abundant surface O and N- containingfunctional groups. The corresponding adsorption and reduction effects on the Cr(VI) removal were investigatedby the carboxyl and hydroxyl groups elimination experiments and ATR-FTIR characterization, respectively. Theresults revealed that HCrO4 ions were preliminarily adsorbed on SCG surfaced-COOH/-OH/-NH by the formation ofhydrogen bond (SCG surfaced-COOH/-OH/-NH···HCrO4), and quickly reduced to Cr(III) by the electron denoted byphenolic compounds, and then in-situ immobilized on the surface of SCG. The effect of Cr(VI) concentration, coexistingions, and humic acid was systematically studied to optimize the removal of Cr(VI) wastewater. Column experimentsprovided a new substitution to restore the Cr(VI)-containing groundwater for the permeable reactive barrierapplication. Thus, the proposed study uncovered the intrinsic Cr(VI) removal mechanism at the molecular level andexplored the application of SCG for the efficient removal of Cr(VI).