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Wenlan Wang,Hongbiao Yin,Genshu Lu,Qiaoping Zhang 서울대학교 교육연구소 2017 Asia Pacific Education Review Vol.18 No.3
This study explored the relationships between Chinese college students’ perceptions of the classroom environment and some affective aspects in the study of mathematics. A total of 2529 students responded to three measures that were specifically designed to assess college students’ perceptions of the mathematics classroom environment, their emotional experiences and values of studying mathematics. Comparatively, the students had a higher score on the value of mathematics but lower scores on their emotional experiences of mathematics learning, and the characteristics of the classroom environment had some significant effects on the students’ emotional experiences and values of studying mathematics. The eight classroom environmental factors were categorised into three groups according to the nature and extent of their effects on students’ affect in mathematics learning. Although most classroom environmental factors had a positive impact on college students’ emotional experiences and values in the study of mathematics, the effects of two environmental factors, the difficulty of studying mathematics and teacher support, were of particular interest. Given these results, instructors are encouraged to leave more room for student autonomy, to adopt some innovative learning approaches to promote student collaboration and to pay close attention to the difficulty of the mathematics curricula and competition among students.
Harmless Measurement of Tree Root Distribution Using Electrical Resistivity Method
Wenlan Guo,Junshen Gao1,Yun Zhang 보안공학연구지원센터 2016 International Journal of u- and e- Service, Scienc Vol.9 No.11
The trees are of great meaning to the life and daily life of the human beings in various fields. However, the trees would disturb the normal activities of peoples. One of the problems is the growth of the tree roots close to the buildings or the roads can cause directly or indirectly structural damages. In this paper, a electrical measurement method based on resistivity is proposed The electrical property of tree root is analyzed. Finally, a tree root measurement system is built and practically tested.
Yuan Gao,Yubin Ji,Wenlan Li,Fuling Wang,Fuling Wang,Xiaomeng Zhang,Zhihui Niu,Lulu Zhou,Lijun Yan 한국식품영양과학회 2021 Journal of medicinal food Vol.24 No.2
This study focused on the antibacterial effects of the endophytic fungi producing naringenin from Dalbergia odorifera T. Chen against Staphylococcus aureus. The antibacterial activity was measured by the inhibition diameters, minimum inhibitory concentration (MIC), and minimum bactericidal concentration (MBC). The time-killing curve was also used to evaluate its antibacterial efficacy. The results of antibacterial activity determinations showed that endophytic fungi secondary metabolites can inhibit the growth of five pathogenic bacteria (S. aureus, Escherichia coli, Salmonella enteritidis, Pseudomonas aeruginosa, and Bacillus subtilis) and the most sensitive strain was S. aureus that had the MIC and MBC values of 0.13 and 0.50 mg/mL, respectively. The membrane permeability study was measured by a DNA leakage assay and electrical conductivity assay. Furthermore, the whole-cell protein lysates and DNA fragmentation assay was evaluated. The morphology of S. aureus treated with the endophytic fungi products was observed by scanning electron microscopy (SEM). The probable antibacterial mechanism of endophytic fungi secondary metabolites was the increased membrane permeability that leads to leaks of nucleic acids and proteins. SEM results further confirmed that the extracts can interfere with the integrity of S. aureus cell membrane and further inhibit the growth of bacteria, resulting in the death of bacteria. This study provides a new perspective for the antibacterial functions of endophytic fungi secondary metabolites for biomedical applications.
Jiheng Li,Chao Yuan,Wenlan Zhang,Xiaoqian Bao,Xuexu Gao 한국자기학회 2016 Journal of Magnetics Vol.21 No.1
The 〈100〉 oriented Fe83Ga17 alloys with various contents of NbC or B were prepared by directionally solidification method at the growth rate of 720 ㎜·h<SUP>−1</SUP>. With a small amount of precipitates, the columnar grains grew with cellular mode during directional solidification process, while like-dendrite mode of grains growth was observed in the alloys with higher contents of 0.5 at% due to the dragging effect of precipitates on the boundaries. The NbC precipitates disperse both inside grains and along the boundaries of Fe83Ga17 alloys with NbC addition, and the Fe₂B secondary phase particles preferentially distribute along the grain boundaries in B-doped alloys. Precipitates could affect grain growth and improved the 〈100〉 orientation during directional solidification process. Small amount of precipitate element addition slightly increased the magnetostrictive strain, and a high value of 335 ppm under pre-stress of 15 ㎫ was achieved in the alloys with 0.1 at% NbC. Despite the fact that the effect on magnetic induction density of small amount of precipitates could be negligible, the coercivity markedly increased with addition of precipitate element for Fe83Ga17 alloy due to the retarded domain motion resulted by precipitates.
Yuan Gao,Yubin Ji,Fuling Wang,Wenlan Li,Xiaomeng Zhang,Zhihui Niu,Zhuo Wang 한국식품과학회 2021 Food Science and Biotechnology Vol.30 No.13
Blueberry residue is usually discarded as waste,but has a high anthocyanins content. The extraction methodof anthocyanins from blueberry residue with ultrasonicassisted dual-aqueous phase system was optimized. Interms of the principle of central group and design (CCD)experimental design, three-factor and five-level responsesurface analysis was adopted to optimize the extractionconditions with the extraction rate of anthocyanins. Theoptimum extraction rate of anthocyanin was12.372 ± 0.078 mg/g. Anthocyanin extract could protectthe pBR322 DNA oxidative damage induced by Fentonreagent, increase the superoxide dismutase(SOD) and glutathioneperoxidase (GSH-Px) enzyme activities, anddecrease the H2O2-induced cell apoptosis of human normalliver cell (LO2 cell). The study indicates that the extractionrate of anthocyanin was increased by optimized ultrasonicassisted dual-aqueous phase system. The anthocyaninextract could protect DNA and LO2 cell from oxidativedamage.