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Fuhao Liu,Hanjun Jiang,Shaona Liu,Xuehua Yu 대한기계학회 2016 JOURNAL OF MECHANICAL SCIENCE AND TECHNOLOGY Vol.30 No.12
A new analytical model of a spur gear system with sliding friction is presented. Unlike previous models, the excitation consists of two parts: the rotational driving speed of the pinion and the drag torque acting on the gear. The proposed model was validated with the finite element model. Using numerical method, the steady state resolutions was obtained to mainly demonstrate the nonlinear characteristics under both constant and variable excitations. The results obtained illustrate that sliding friction could introduce additional vibration. Moreover, the sliding friction even could decrease the dynamic transmission errors under proper operation condition. Further, the bifurcation diagram was plotted to show the influence of the rotational driving speed of the pinion on the dynamical characteristic of the gear system. Finally, the fluctuated excitation was used to exhibit their different effects on the gear system, which should form the basis of further analytical and experimental work in the gear dynamic area.
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Enhanced photocatalytic oxidation of humic acids using Fe<SUP>3+</SUP>-Zn<SUP>2+</SUP> co-doped TiO₂
Rongfang Yuan,Dan Liu,Shaona Wang,Beihai Zhou,Fangshu Ma 대한환경공학회 2018 Environmental Engineering Research Vol.23 No.2
Photocatalytic oxidation in the presence of Fe-doped, Zn-doped or Fe-Zn co-doped TiO₂ was used to effectively decompose humic acids(HAs) in water. The highest HAs removal efficiency (65.7%) was achieved in the presence of 500°C calcined 0.0010% Fe-Zn co-doped TiO₂ with the Fe:Zn ratio of 3:2. The initial solution pH value, inorganic cations and anions also affected the catalyst photocatalytic ability. The HAs removal for the initial pH of 2 was the highest, and for the pH of 6 was the lowest. The photocatalytic oxidation of HAs was enhanced with the increase of the Ca<SUP>2+</SUP> or Mg2+ concentration, and reduced when concentrations of some anions increased. The inhibition order of the anions on TiO₂ photocatalytic activities was CO₃<SUP>2-</SUP> > HCO₃<SUP>-</SUP> > Cl-, but a slightly promotion was achieved when SO₄<SUP>2-</SUP> was added. Total organic carbon (TOC) removal was used to evaluate the actual HAs mineralization degree caused by the 500°C calcined 0.0010% Fe-Zn (3:2) co-doped TiO₂. For tap water added with HAs, the UV254 and TOC removal rates were 57.2% and 49.9%, respectively. The UV254 removal efficiency was higher than that of TOC because of the generation of intermediates that could significantly reduce the UV254, but not the TOC.
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Kinetics and Modeling for Extraction of Chrysin from Oroxylum indicum Seeds
Li Zhou,Ting Jing,Peipei Zhang,Liqin Zhang,Shaona Cai,Tingting Liu,Huihui Fan,Guangde Yang,Rong Lin,Jiye Zhang 한국식품과학회 2015 Food Science and Biotechnology Vol.24 No.6
Research on extraction of chrysin is crucial for theoretical purposes and for food industrial bioprocesses. Optimization and kinetics of chrysin extraction from seeds of Oroxylum indicum (L.) Vent. were analyzed using agitated solid-liquid extractions with ethanol and water mixtures. The influence of extraction process parameters was investigated. Optimized conditions for chrysin extraction were a 0.2 mole fraction of ethanol as an extraction solvent, a temperature of 318 K, an agitation speed 1,400 rpm, and a solid to solvent ratio of 1:30. The extraction kinetic behavior of chrysin followed first order kinetics. The kinetic expression developed by Spiro and Siddique was used and the model was in agreement with experimental results. The diffusion coefficient ranged from 1.38×10−11 to 19.43×10−11 m2·s−1 and the activation energy for extraction kinetics was 21.85 kJ·mol−1.
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