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Predicting digital informal learning: an empirical study among Chinese University students
Tao He,Chang Zhu,Frederik Questier 서울대학교 교육연구소 2018 Asia Pacific Education Review Vol.19 No.1
Although the adoption of digital technology has gained considerable attention in higher education, currently research mainly focuses on implementation in formal learning contexts. Investigating what factors influence students’ digital informal learning is still unclear and limited. To understand better university students’ digital informal learning (DIL), this study proposed a model based on decomposed theory of planned behavior to investigate students’ behavioral intention to DIL. Different aspects of DIL behavior were further explored, through examining behaviors of cognitive learning, metacognitive learning, and social and motivation learning. This study also integrated digital competence as a new construct into the model, along with other variables to test the proposed model. A sample of 335 students selected from three universities in China took part in this study. The partial least square structural equation modeling was applied to analyze the data. The results provide support and better understanding for the importance of motivation factors such as digital competence and compatibility to explain students’ DIL.
Optimization of formic acid hydrolysis of corn cob in xylose production
Tao Zhu,Pingli Li,Xiaowei Wang,Wandian Yang,Heying Chang,Sai Ma 한국화학공학회 2014 Korean Journal of Chemical Engineering Vol.31 No.9
Dilute acid pretreatment of lignocellulosic material is one of the significant steps in a biorefinery. We usedresponse surface methodology to determine the important factors of formic acid concentration (2%-6% wt%), treatmenttime (30-150 min), reaction temperature (120-160 oC), and liquid to solid ratio (3-11 mL/g) on dilute acid hydrolysisof corn cob to produce xylose. A xylose yield of 81.6% and selectivity of 15.1 g/g were achieved under the optimalconditions (5% acid concentration, 150 min, 135 oC, and 7 mL/g liquid to solid ratio). The addition of trivalent salts(FeCl3, Fe(NO3)3, and Fe2(SO4)3) to the reaction system enhanced the xylose yield but decreased selectivity. The FeCl3concentration over 0.75 mol/L had a negative effect on xylose production.
Comparison of adsorption equilibrium of glycyrrhizic acid and liquiritin on C18 column
Tao Zhu,Minglei Tian,노경호 한국공업화학회 2010 Journal of Industrial and Engineering Chemistry Vol.16 No.6
The adsorption isotherms of glycyrrhizic acid (GA) and liquiritin (LQ) on a C18 column were compared and the competitive adsorption of the two compounds was investigated. The experimental parameters in the equilibrium isotherms were estimated by linear and nonlinear regression analyses. The adsorption equilibrium data were correlated into the linear, Langmuir, competitive Langmuir, Freundlich, and Langmuir–Freundlich isothermmodels. Over amoderate concentration range, the competitive Langmuir isotherm provided the best fit to the experimental data. The regression coefficients of the competitive Langmuir adsorption isotherms were 0.9754 and 0.9855 for themixtures of GA and LQ, respectively. The coefficients obtained for the five isothermmodels confirmed the superiority of the competitive Langmuir isotherm for analyzing the adsorption data of solutes.
Adsorption of carbon dioxide on ionic liquids-modified active carbons and amino-modified polymer
Tao Zhu,노경호,Wentao Bi 한국화학공학회 2011 Korean Journal of Chemical Engineering Vol.28 No.3
Active carbons with various particle sizes (38-150, 300-500 and 800-1,200 μm) were modified by ionic liquids (ILs), and organic polymer was modified by acrylamide using a simple procedure, and these materials were applied to capture carbon dioxide (CO_2). The CO_2 adsorption amounts were calculated using a mass balance equation at three different temperatures (298.15, 308.15 and 318.15 K), respectively, and the influences of gas pressure, particle size and temperature on adsorption were discussed. Experimental results showed that the CO-2 adsorption capacity of ILs-modified active carbons was better than amino-modified polymer, and the smaller particle size (38-150 μm) ILsmodified active carbons had the largest adsorption capacity at 298.15 K. Compared with previous research about polyethyleneimine (PEI)-modified silica gel, the adsorption amount of CO_2 on ILs-modified active carbons has been greatly improved with lower cost.
Zhu, Tao,Bi, Wentao,Row, Kyungho WILEY‐VCH Verlag 2011 Chinese journal of chemistry Vol.29 No.8
<P><B>Abstract</B></P><P>A short ionic liquids (ILs)‐based monolithic cartridge was prepared and used as the selective extraction sorbent. After the material was evaluated by field emission‐scanning electron microscopy (FE‐SEM), a new approach for the extraction and determination of quercetin and myricetin from <I>Chamaecyparis obtusa </I>(<I>C. obtusa</I>) by using ILs‐based, monolithic cartridge system was developed. Chromatographic analysis was conducted on a C<SUB>18</SUB> column with UV detection at 372 nm, an eluting solution consisting of acetonitrile‐water (25/75,<I>V/V</I>) as the mobile phase, and a flow rate of 0.7 mL·min<SUP>−1</SUP>. A good linear relationship was demonstrated when the concentrations of quercetin and myricetin were in the range of 0.5–100.0 µg·mL<SUP>−1</SUP>. The recoveries ranged from 101.6% to 104.6% and the inter‐ and intra‐day relative standard deviations (RSD) were less than 5.0%. This method effectively removed the impurities and avoided tedious pretreatment. It provided a fast, economic and effective method for assaying trace drugs from natural plants.</P>
Effect of Initial Orientation on Corrosion Behavior of AZ80 Magnesium Alloy in Simulated Body Fluid
Tao Zhu,Xinghua Gong,Ying Xiong,Xiaxia Hu 대한금속·재료학회 2021 METALS AND MATERIALS International Vol.27 No.8
Three diferent orientation specimens (P-ND30, P-ND60 and P-TD) prepared from the rolled AZ80 magnesium alloy plateswere immersed in simulated body fuid (SBF) for 384 h. Electrochemical impedance spectroscopy (EIS) tests were measuredat 24 h, 96 h, 192 h, 288 h, and 384 h during immersion. The corrosion morphology and chemical composition of the threeorientation specimens were investigated using scanning electron microscopy (SEM) and energy dispersive spectroscopy(EDS). X-ray difractometer (XRD) was used to evaluate the phase composition of the surface of the specimen at diferentimmersion stages. The results indicated that the P-ND30 and P-ND60 specimens had similar corrosion behavior. The P-TDspecimen showed the best corrosion resistance. A degradation evolution model was established, and the efect of initialorientation on corrosion behavior was discussed.
Zhu Tao,Zhang Hong,Li Sijie,Wu Kaifeng,Yin Yibing,Zhang Xuemei 생화학분자생물학회 2022 Experimental and molecular medicine Vol.54 No.-
Leukemia is caused by the malignant clonal expansion of hematopoietic stem cells, and in adults, the most common type of leukemia is acute myeloid leukemia (AML). Autophagy inhibitors are often used in preclinical and clinical models in leukemia therapy. However, clinically available autophagy inhibitors and their efficacy are very limited. More effective and safer autophagy inhibitors are urgently needed for leukemia therapy. In a previous study, we showed that ΔA146Ply, a mutant of pneumolysin that lacks hemolytic activity, inhibited autophagy of triple-negative breast cancer cells by activating mannose receptor (MR) and toll-like receptor 4 (TLR4) and that tumor-bearing mice tolerated ΔA146Ply well. Whether this agent affects AML cells expressing TLR4 and MR and the related mechanisms remain to be determined. In this study, we found that ΔA146Ply inhibited autophagy and induced apoptosis in AML cells. A mechanistic study showed that ΔA146Ply inhibited autophagy by activating mammalian target of rapamycin signaling and induced apoptosis by inhibiting autophagy. ΔA146Ply also inhibited autophagy and induced apoptosis in a mouse model of AML. Furthermore, the combination of ΔA146Ply and chloroquine synergistically inhibited autophagy and induced apoptosis in vitro and in vivo. Overall, this study provides an alternative effective autophagy inhibitor that may be used for leukemia therapy.