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- 저자 : Ye Yuchen (검색결과 4 건)
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Fei Yuchen,Ye Xiaofang,Al-Baldawy Aseel Shaker,Wan Jing,Lan Jinshen,Zhao Jingtian,Wang Ziyun,Qu Shanzhi,Hong Rongdun,Guo Shengshi,Huang Shengli,Li Shuping,Kang Junyong 한국물리학회 2022 Current Applied Physics Vol.44 No.-
Noble metal particles have been embedded in semiconductors to improve photocatalysis efficiently, but the high cost made this approach difficult to apply widely in industry. Herein titanium dioxide/reduced graphene oxide (TiO2/rGO) nanowires in a core-shell structure were prepared. The physicochemical properties and photocatalytic performance of the specimen were characterized in comparison with TiO2 and TiO2/Pt nanowires. The rGO layer and Pt nanoparticles increased chemical states of the components, reduced bandgap energy of the nanowires, enhanced visible light absorption, improved conductance and capacitance significantly. The methylene blue as catalyzed by TiO2/Pt and TiO2/rGO nanowires was degraded to 7.9% and 8.4% in an hour, but retained 25.7% by the TiO2 nanowires. The properties and function of TiO2/rGO nanowires were close to those of TiO2/Pt nanowires, while the rGO price was much lower than that of Pt, which was of great significance for the photocatalytic application of TiO2 heterojunction materials in industry.
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A modular switched‑capacitor multilevel inverter featuring voltage gain ability
Yaoqiang Wang,Juncheng Ye,Ruohan Ku,Yuchen Shen,Gen Li,Jun Liang 전력전자학회 2023 JOURNAL OF POWER ELECTRONICS Vol.23 No.1
This article presents a modular switched-capacitor multilevel inverter which uses two capacitors and a single dc source to obtain triple voltage gain. It is worth noting that the inherent inversion capacity removes the H-bridge, which can efficaciously diminish the voltage stress of switches, and the maximum voltage stress (MVS) on devices is kept within 2Vdc. Additionally, the proposed topology is able to integrate inductive load, and the capacitor voltage self-balancing can be achieved. Moreover, the modular structure also has an expandable topology which can generate more levels and raise the voltage gain by using multiple switched-capacitor units, meanwhile the voltage stress on power switches can be kept within 2Vdc. Furthermore, comprehensive analysis and comparison with other multilevel inverters have been implemented to certify the superiority of the proposed topology. Finally, the steady-state and dynamic performance of the proposed topology is examined through a seven-level inverter prototype, the validity and practicability of the topology are verified by simulations and experiments.
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Jiangtao Su,Meng Rao,Heshuang Dai,Le Cai,Fan Ye,Lu Ye,Yuchen Hu,Ban Chen,Xiaoxia Guo 한국고분자학회 2024 Macromolecular Research Vol.32 No.2
In this work, pH/GSH-responsive amphiphilic polymeric prodrug (EDA-GLA/CE/2-FPBA) was successfully prepared and could self-assembled into micelles in an aqueous solution. The EDA-GLA/CE/2-FPBA micelles possessed high stability in physiological condition and were pH and GSH sensitive due to the reversible borate ester bonds and disulfide bonds within the prodrug polymer. The structures of the prodrug polymers were characterized by NMR, FTIR, UV–vis spectroscopy. Transmission electron microscopy and dynamic light scattering measurement indicated that the resulting micelles have desirable size distribution and regular spherical shape. Free active Celastrol can be released under low pH and high GSH environment; In vitro cellular uptake and growth inhibition assays suggested that the blank polymer micelles showed good biocompatibility. EDA-GLA/CE/2-FPBA micelles were more efficiently internalized by monolayer tumor cells and demonstrated superior tumor targeting effects as compared to free Celastrol control. These results demonstrated that the novel prodrug self-assembled dual-responsive nano-delivery platform was able to improve the bioavailability and tumor targeting activity of Celastrol, which provides a basis for further clinical applications of Celastrol and its derivatives.
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Zhou Pinghui,Wei Bangguo,Guan Jingjing,Chen Yu,Zhu Yansong,Ye Yuchen,Meng Yue,Guan Jianzhong,Mao Yingji 한국조직공학과 재생의학회 2021 조직공학과 재생의학 Vol.18 No.1
BACKGROUND: Degeneration of the annulus fibrosus (AF), an important structure of the intervertebral disc, is one of the main causes of degenerative disc disease. Fabrication of scaffolds replicating the stratified microstructure of the AF is critical for the successful regeneration of AF. METHODS: In this study, we cultured rabbit AF-derived stem cells (AFSCs) using fabricated electrospun fibrous poly-L-lactic acid scaffolds with different diameters. We applied cyclic tensile strain (CTS) on the scaffolds to regulate the differentiation of AFSCs into specific cell types that resided at the inner, middle, and outer zones of the AF. RESULTS: We found that the morphologies of AFSCs on the smaller-fiber-diameter scaffolds were nearly round, whereas spindle-like cells morphologies were observed on large-diameter scaffolds. CTS enhanced these phenomena and made the cells slender. The expression levels of collagen-I in cells increased as a function of the fiber diameter, whereas collagen-II and aggrecan exhibited opposite trends. Moreover, the application of CTS upregulated the gene expressions of collagen-I, collagen-II, and aggrecan. CONCLUSION: Overlaying the scaffolds with different CTS-stimulated cells could eventually lead to engineered AF tissues with hierarchical structures that approximated the native AF tissue. Thus, the proposed methodologies could be potentially applied for AF regeneration. BACKGROUND: Degeneration of the annulus fibrosus (AF), an important structure of the intervertebral disc, is one of the main causes of degenerative disc disease. Fabrication of scaffolds replicating the stratified microstructure of the AF is critical for the successful regeneration of AF. METHODS: In this study, we cultured rabbit AF-derived stem cells (AFSCs) using fabricated electrospun fibrous poly-L-lactic acid scaffolds with different diameters. We applied cyclic tensile strain (CTS) on the scaffolds to regulate the differentiation of AFSCs into specific cell types that resided at the inner, middle, and outer zones of the AF. RESULTS: We found that the morphologies of AFSCs on the smaller-fiber-diameter scaffolds were nearly round, whereas spindle-like cells morphologies were observed on large-diameter scaffolds. CTS enhanced these phenomena and made the cells slender. The expression levels of collagen-I in cells increased as a function of the fiber diameter, whereas collagen-II and aggrecan exhibited opposite trends. Moreover, the application of CTS upregulated the gene expressions of collagen-I, collagen-II, and aggrecan. CONCLUSION: Overlaying the scaffolds with different CTS-stimulated cells could eventually lead to engineered AF tissues with hierarchical structures that approximated the native AF tissue. Thus, the proposed methodologies could be potentially applied for AF regeneration.
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