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RISS 인기검색어
- 검색키워드
- 저자 : Jingyuan Cao (검색결과 4 건)
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Jingyuan Cao,Fei Wang,Shuai Liang,Xue Tong,Zhongnan Zhang,Jian Feng,Haifeng Wang,Xingmao Jiang 성균관대학교(자연과학캠퍼스) 성균나노과학기술원 2017 NANO Vol.12 No.10
Nickel nanoparticles embedded in mesoporous silica (Ni/SiO2) were successfully synthesized by microwave-assisted in situ self-assembly method using colloidal silica, urea and nickel nitrate as precursors and glucose as carbon template, which resulted in mesoporous structure of silica through removal of template. Ni nanoparticles were uniformly well-dispersed within mesoporous silica, which were 3.5–4.0nm in diameter and had a very narrow particle size distribution. In addition, particle size of Ni nanoparticles can be controllably adjusted by microwave power. As prepared Ni/SiO2 catalyst exhibited better catalytic activity for reduction of 4-nitrophenol (4-NP) to 4-aminophenol (4-AP) than Ni/SiO2-IM catalyst, which was mainly attributed to confinement effect of mesoporous silica support. This simple and versatile method can also be extended to cover many kinds of other supported catalysts for broad applications in many other catalytic reactions in the future.
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Salt-Free and Alkali-Free Fixing Method of Wool Fabric Dyeing in Non-Aqueous Media Dyeing System
Liujun Pei,Jingyuan Yi,Jingru Chen,Wenhua Shi,Wenzhao Cao,Hongjuan Zhang,Jiping Wang 한국섬유공학회 2023 Fibers and polymers Vol.24 No.1
Non-aqueous media dyeing is an important water-saving and salt-free dyeing technology in the textile dyeing industry. In thisinvestigation, a salt-free and alkaline-free dyeing technology was developed for wool fabrics. After padding with reactivedye solution, wool fabric was fixed in a non-aqueous medium at 90 °C for 90 s. After washing, the fixation of reactive dyecan achieve more than 98% in a salt-free and alkali-free dyeing environment. The effect of fixing method on the physicalproperties of wool fabrics was analyzed by TGA, DSC, and XRD. Compared with steam and cold batch fixing method, thefixing process in non-aqueous medium has little effect on the mechanical properties of wool fabrics. The final decompositiontemperature of wool fabric dyed with non-aqueous medium was about 46 °C, which was higher than that of the fabric samplesdyed by other methods. Moreover, the crystallinity of wool fiber was increased after non-aqueous fixation process. And nonaqueousmedium had no influence on the surface morphology of wool fabrics. For non-aqueous medium and steaming fixingmethods, there were only hydrolyzed dyes, but some hetero-bifunctional dyes were detected in the cold batching system,indicating that reactive dyes could effectively react with wool fibers in non-aqueous medium and steaming fixing system.
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Novel flexible HVDC transmission converter station topology with DC fault blocking capability
Huo, Qunhai,Wang, Peng,Cao, Guoen,Zhu, Jin,Yin, Jingyuan,Guo, Xinming,Wei, Tongzhen The Korean Institute of Power Electronics 2020 JOURNAL OF POWER ELECTRONICS Vol.20 No.4
The conventional half-bridge submodule (HBSM)-based multilevel modular converter (MMC) cannot block DC faults. To solve this problem, a novel flexible overhead-line high-voltage direct current (HVDC) transmission converter station topology is proposed in this study, which provides DC fault blocking capability. By adding blocking submodules (SMs) onto the positive and negative DC buses of a conventional HBSM converter station, a rapid fault current blocking can be achieved in the case of a DC bus short circuit. The DC fault blocking principle of the proposed topology and the rapid fault blocking capability of the blocking SM are analyzed. The quantity of required major components is also calculated. In addition, the IGBT, the system loss and the control complexity quantities are comprehensively compared with those of existing topologies. The validity of the proposed topology is demonstrated based on simulation and experimental studies.
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Zhao, Lian-Heng,Cao, Jingyuan,Zhang, Yingbin,Luo, Qiang Techno-Press 2015 Geomechanics & engineering Vol.8 No.3
In this paper, stabilities of a plane slide rock slope under different hydraulic distributions were studied based on the nonlinear Barton-Bandis (B-B) failure criterion. The influence of various parameters on the stability of rock slopes was analyzed. Parametric analysis indicated that studying the factor of safety (FS) of planar slide rock slopes using the B-B failure criterion is both simple and effective and that the effects of the basic friction angle of the joint (${\varphi}_b$), the joint roughness coefficient (JRC), and the joint compressive strength (JCS) on the FS of a planar slide rock slope are significant. Qualitatively, the influence of the JCS on the FS of a slope is small, whereas the influences of the ${\varphi}_b$ and the JRC are significant. The FS of the rock slope decreases as the water in a tension crack becomes deeper. This trend is more significant when the flow outlet is blocked, a situation that is particularly prevalent in regions with permafrost or seasonal frozen soil. Finally, the work is extended to study the reliability of the slope against plane failure according to the uncertainty from physical and mechanics parameters.
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