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Analysis of Physical Education Teaching Evaluation System
( Dong Xiaoxue ) 인문사회과학예술융합학회 2020 인문사회과학예술융합학회지 Vol.4 No.1
In order to realize the accurate evaluation of physical education teaching quality, a big data analysis model of physical education teaching quality evaluation is proposed, and the system analysis the evaluation of physical education teaching .Big data classification and identification of physical education quality are carried out by using K-means clustering method. According to the results of statistical feature clustering of physical education quality, the input effectiveness of physical education hardware facilities is evaluated. Establish the quantitative evaluation model of financial expenditure and PE teaching quality evaluation project performance, adopt F statistic quantity analysis method to adjust the structure of physical education teaching hardware input and teacher force input. According to the statistical analysis results of physical education teaching quality evaluation, the self-adaptive evaluation of physical education teaching quality evaluation is carried out, and the optimization of physical education teaching quality evaluation is realized by combining the big data analysis method.
The Effect of Dipping Pretreatment on Ochratoxin A Accumulation in Sultanas and Currants
Xiaoxu Zhang,Jingming Li,Dong Wang,Saisai Feng,Liyan Ma 한국식품과학회 2016 Food Science and Biotechnology Vol.25 No.3
The dipping pretreatment on the occurrence of ochratoxin A (OTA) in sultanas and currants was investigated. Grape samples were divided into two groups before a drying process. One group was dipped with potassium carbonate-ethyl oleate, and the other group was left without treatment (the control). OTA were detected using solid-phase extraction clean-up and a high-performance liquid chromatography fluorescence detector. Results showed that OTA content was below the limit of detection in the fresh grapes of both varieties. OTA were not detected in dried vine fruits before storage. However, a real naturally environmental storage revealed that the dipping pretreated samples were contaminated with OTA earlier and to a greater extent than the control. The OTA concentration in the treated and control samples after one-year storage was 0.22 and 0.19 μg/kg for sultanas and 0.34 and 0.21 μg/kg for currants, respectively. These results indicated that dipping pretreatment might increase the toxin contamination and safety risk.
Shuying Dong,Xuanxuan Yan,Wenli Li,Yafei Liu,Xiaoxu Han,Xiaodan Liu,Jinglan Feng,Chongfei Yu,Chunyan Zhang,Jianhui Sun 한국공업화학회 2022 Journal of Industrial and Engineering Chemistry Vol.108 No.-
In order to obtain a robust, durable and efficient heterogeneous catalyst, macroscopic monolithic Zndopeda-Fe2O3/graphene aerogel (GA) hybrid architecture with integrated morphology and hierarchicallyporous structure were controllably synthesized via a facile in-situ hydrothermal method and then used aspersulfate (PS) activator for sulfamonomethoxine (SMM) wastewater purification. Several key reactionparameters including the initial SMM concentration, reaction temperature, coexisting inorganic anionsand SMM in real natural water samples had different influence on the SMM removal efficiency. The catalyticefficiency of Zn-doped a-Fe2O3/GA with the molar ratio of Fe/Zn = 2:1.5 was about 66%, 62%, 66%and 11%33% higher than that of GA, a-Fe2O3/GA, Zn/GA and other Fe/Zn molar ratio. The improvedactivity of Fe/Zn = 2:1.5 benefits from the synergistic effects of the sp2 hybridized carbon and porousframework, as well as the surface oxygenic functional groups, which accelerate the pollutant/oxidant dispersionand electron transfer. Electron paramagnetic resonance results indicate that OH, 1O2 and SO4radicals account for the catalytic degradation of SMM and the activation of PS in present system is differentfrom conventional homogeneous systems, and speculate mechanism was proposed based on theobtained data.
Environmental Regulation Effects Revisited: Channel Effects on Industrial Economic Performance
( Yun Seop Hwang ),( Xiaoxu Dong ),( Wonwoong Choi ) 한국생산성학회 2016 生産性論集 Vol.30 No.2
This paper theoretically reviews the researches about the effects of environmental regulations on economic performances. According to the previous researches, we propose that environmental regulations affect industrial economic performances through three channels: export, foreign direct investment, and innovative activities. We collected the related data over the period of 1997-2009 from 14 industries in Korea. The emission amounts of the eight kinds of pollutants were used to calculate the pollutant index as the measure of stringency of environmental regulations. We used the simultaneous equations model and the 3SLS method to solve the endogenous problems between the variables. The results indicated that environmental regulations negatively affect industrial economic performances through export channels. Environmental regulations have insignificant effects on inflow FDI. Although environmental regulations motivate companies to increase R&D investments, it does not influence industrial economic performances through R&D investments. In the future, Korean government should implement various policies of environmental regulations, reinforce economic policies and soft policies to enhance efficiency and flexibility.
Han, Bing,Zhao, Kai,Hou, Xiaoxue,Kim, Dong-Jin,Kim, Bok-Hee,Ha, Su,Norton, M. Grant,Xu, Qing,Ahn, Byung-Guk Elsevier 2017 Journal of Power Sources Vol.338 No.-
<P><B>Abstract</B></P> <P>A titanium-doped Ce<SUB>0.8</SUB>Sm<SUB>0.2</SUB>O<SUB>1.9</SUB> composite is developed as an anode component of low temperature solid oxide fuel cells running on methane fuel. Crystallographic parameters of (Ce<SUB>0.8-x</SUB>Ti<SUB>x</SUB>)Sm<SUB>0.2</SUB>O<SUB>2-δ</SUB> (0.00 < x < 0.10) are investigated with respect to the amount of titanium. The composites show a single cubic phase with the titanium amount being in the range of 0.00–0.07, while the lattice parameters decrease with increasing titanium content. The (Ce<SUB>0.8-x</SUB>Ti<SUB>x</SUB>)Sm<SUB>0.2</SUB>O<SUB>2-δ</SUB> composites are applied to an anode-supported single cell consisting of Ni-(Ce<SUB>0.8-x</SUB>Ti<SUB>x</SUB>)Sm<SUB>0.2</SUB>O<SUB>2-δ</SUB> anode/Ce<SUB>0.8</SUB>Sm<SUB>0.2</SUB>O<SUB>1.9</SUB> electrolyte/La<SUB>0.6</SUB>Sr<SUB>0.4</SUB>Co<SUB>0.2</SUB>Fe<SUB>0.8</SUB>O<SUB>3-δ</SUB> cathode. Catalytic properties of Ni-(Ce<SUB>0.8-x</SUB>Ti<SUB>x</SUB>)Sm<SUB>0.2</SUB>O<SUB>2-δ</SUB> are inspected with the electrochemical performance and performance stability of the cells in dry methane fuel. The cell with Ni-(Ce<SUB>0.73</SUB>Ti<SUB>0.07</SUB>)Sm<SUB>0.2</SUB>O<SUB>2-δ</SUB> (x = 0.07) anode displays a low polarization resistance and an optimum maximum power density (679 mW cm<SUP>−2</SUP> at 600 °C). A performance stability investigation indicates that the cell exhibits a fairly low degradation rate of 3 mV h<SUP>−1</SUP> during a 31 h operation in dry methane. These findings suggest the application potential of the titanium doped Ce<SUB>0.8</SUB>Sm<SUB>0.2</SUB>O<SUB>1.9</SUB> for the anode of solid oxide fuel cells.</P> <P><B>Highlights</B></P> <P> <UL> <LI> Ti doped Ce<SUB>0.8</SUB>Sm<SUB>0.2</SUB>O<SUB>1.9</SUB> is found to be a potential anode material. </LI> <LI> Ni-(Ce<SUB>0.8-x</SUB>Ti<SUB>x</SUB>)Sm<SUB>0.2</SUB>O<SUB>2-δ</SUB> shows excellent electrochemical performance in methane. </LI> <LI> Good performance stability demonstrates application feasibility of the anode. </LI> </UL> </P> <P><B>Graphical abstract</B></P> <P>[DISPLAY OMISSION]</P>