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Your search keyword '"Xu, Qianqian"' showing total 784 results
784 results on '"Xu, Qianqian"'

24. How to seek stability in an uncertain world : —— On the love writing in Pan Xiangli’s novels

Author

Xu, Qianqian, Striełkowski, Wadim, Editor-in-Chief, Black, Jessica M., Series Editor, Butterfield, Stephen A., Series Editor, Chang, Chi-Cheng, Series Editor, Cheng, Jiuqing, Series Editor, Dumanig, Francisco Perlas, Series Editor, Al-Mabuk, Radhi, Series Editor, Scheper-Hughes, Nancy, Series Editor, Urban, Mathias, Series Editor, Webb, Stephen, Series Editor, Marino, Elisabetta, editor, Wang, Yixiang, editor, Majoul, Bootheina, editor, and Lee, Hsuan, editor

Published
2023
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46. Pre-Service Early Childhood Teachers' Attitudes and Intentions: Young Children's Use of ICT

Author

Dong, Chuanmei and Xu, Qianqian

Abstract

Pre-service early childhood teachers (PECTs) are expected to support young children's engaged and meaningful use of ICT for early learning and development. Unless teachers believe that ICT is beneficial for young children, they will be unable or unwilling to encourage and support children's use of ICT in educational environments. This paper aims to uncover PECTs' attitudes and intentions regarding young children's use of ICT through a survey on 410 PECTs in a Chinese university. The majority of the PECTs had low positive perceptions of the role of ICT for young children, whereas they expressed great willingness to support young children's use of ICT. There are considerable parameters which influence both PECTs' attitudes and intentions: ICT ownership and daily use, the frequency of ICT use, ICT professional learning or training and ICT skills. Implications for PECTs teacher education preparation were discussed.

Published
2021
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49. pH and light dual-stimuli responsive wormlike micelles based on azophenyl surfactant and Sodium oleate.

Author

Wang, Guozheng, Lin, Mengying, Xu, Qianqian, Jiang, Jianzhong, Zheng, Raojun, and He, Yibo

Subjects
VISCOELASTIC materials, VISCOSITY, SODIUM, SURFACE active agents, VISCOSITY solutions
Abstract

Herein, pH and light dual-stimuli responsive wormlike micelles (WLMs) were prepared with (4-butylphenyl)-2-(4-trimethylammoniumhexyloxyphen-yl) diazene (C4AzoC6N) and sodium oleate (NaOA). The viscoelasticity of the system was tested by steady state and dynamic rheology. In the alkaline condition, the binary system is a viscoelastic gel-like liquid with a viscosity of up to 230 Pa·s as the presence of the carboxylate group in NaOA, which promotes the formation of WLMs. After the pH of the solution was changed from alkaline to acidic, NaOA was gradually converted into oleic acid, which precipitated out of the system and the viscoelastic system was turned into a cloudy, low-viscosity flowing liquid. On the other hand, the viscosity of the solution could be repeatedly and reversibly switched more than three times without any deterioration upon light trigger due to the cis-trans isomerization of C4AzoC6N. Compared with other surfactants, NaOA is one of cheap and commercially available compounds, which avoids complex organic synthesis or purification processes. Furthermore, the WLMs can be precisely controlled by pH and UV light dual-stimuli, which will have a wide range of applications in large-scale processes, such as in functional materials and fluid drag reducers. [ABSTRACT FROM AUTHOR]

Published
2024
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50. Assessing the Potential of Aconitum Laeve Extract for Biogenic Silver and Gold Nanoparticle Synthesis and Their Biological and Catalytic Applications.

Author

Ahmad, Shahbaz, Xu, Qianqian, Tariq, Muhammad, Song, Meijie, Liu, Chao, and Yan, Hai

Subjects
*SILVER nanoparticles, *GOLD nanoparticles, *NANOPARTICLE synthesis, *BIOSYNTHESIS, *MONKSHOODS, *POLLUTANTS, *RAMAN scattering
Abstract

The adoption of green chemistry protocols in nanoparticle (NP) synthesis has exhibited substantial potential and is presently a central focus in research for generating versatile NPs applicable across a broad spectrum of applications. In this scientific contribution, we, for the first time, examined the ability of Aconitum Laeve (A. Laeve) crude extract to synthesize silver and gold nanoparticles (AgNPs@AL; AuNP@AL) and explored their potential applications in biological activities and the catalytic degradation of environmental pollutants. The synthesized NPs exhibited a distinctive surface plasmon resonance pattern, a spherical morphology with approximate sizes of 5–10 nm (TEM imaging), a crystalline architecture (XRD analysis), and potential functional groups identified by FTIR spectroscopy. The antibacterial activity was demonstrated by inhibition zones that measured 16 and 14 mm for the AgNPs@AL and AuNP@AL at a concentration of 80 µg/mL against Staphylococcus aureus and 14 and 12 mm against Escherichia coli, respectively. The antioxidant potential of the synthesized NPs was evaluated using 2,2-diphenyl-1-picrylhydrazyl (DPPH), 2-Phenyl-4,4,5,5-tetramethylimidazoline-1-oxyl 3-Oxide (PTIO), and 3-ethylbenzothiazoline-6-sulfonic acid (ABTS) assays. Our findings suggest that the AuNP@AL effectively countered the tested radicals considerably, displaying IC50 values of 115.9, 103.54, and 180.85 µg/mL against DPPH, PTIO, and ABTS, respectively. In contrast, the AgNPs@AL showed IC50 values of 144.9, 116.36, and 95.39 µg/mL against the respective radicals. In addition, both the NPs presented significant effectiveness in the photocatalytic degradation of methylene blue and rhodamine B. The overall observations indicate that A. Laeve possesses a robust capability to synthesize spherical nanoparticles, exhibiting excellent dispersion and showcasing potential applications in both biological activities and environmental remediation. [ABSTRACT FROM AUTHOR]

Published
2024
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