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Dewang Kong,Min Zhao,Shikuo Li,Fangzhi Huang,Jiming Song,Yupeng Yuan,YUHUA SHEN,ANJIAN XIE 성균관대학교(자연과학캠퍼스) 성균나노과학기술원 2016 NANO Vol.11 No.1
In this paper, a facile and efficient method combined sol–gel method with hydrothermal process was employed for preparing titanium dioxide (TiO2/reduced graphene oxide (rGO) nanocomposites without using any reductants or surfactants. This approach leads to the reduction of graphene oxide (GO) and the growth of TiO2 nanorods simultaneously. The results reveal that the TiO2 short nanorods with average size of 15 nm in length and 10 nm in diameter were uniformly grown on the rGO sheets with high dispersion. Compared with the pure TiO2 nanoparticles, the TiO2/rGO composites exhibit strong absorption in the visible light range. The photocurrent density of nanocomposites reached 0.826 mA/cm2 under the simulated sunlight illumination, which is 3.5 times than that of pure TiO2. An enhancement of photocatalytic hydrogen formation rate for the water splitting was observed over the TiO2/rGO composite photocatalysts, the fastest formation rate can reach 889.28 µmol·g-1·h-1 when TiO2 coupling with 1wt.% rGO. Also the hydrogen production rate is about 3.27 times larger than pure TiO2 and 2.23 times than P25 due to the excellent electron trapping and transportation properties of rGO and the synergistic effect between TiO2 and rGO.
Zhang Dewang,Chen Zhigeng,Zhou Yu 대한전기학회 2022 Journal of Electrical Engineering & Technology Vol.17 No.3
The uncertainty of wind power brings great challenges to large-scale wind power integration. The conventional point prediction of wind power is diffi cult to meet the demand of power grid planning and operation. In contrast, interval prediction is gaining increasing attention as an eff ective approach as it can describe the uncertainty of wind power. An interval prediction model based on an improved whale optimization algorithm (IWOA) and fast learning network (FLN) was developed in this study. First the convergence speed and accuracy of the IWOA was enhanced by adjusting the nonlinear convergence factor, and by adding adaptive inertia weights and a chaos search strategy. Second, a novel evaluation index was proposed according to the lower and upper bound estimation method. The proposed evaluation index was considered as a fi tness function, and the FLN parameters were optimized by the IWOA to output the fi nal prediction interval. The examples considered in this study revealed that the proposed method can be employed to reduce the prediction interval normalized root-mean-square bandwidth (PINRW) and the prediction interval average deviation (PIAD) more than 3% and 8% at the 90% and 80% confi dence level respectively, which has a high practical signifi cance.
Microstructure and Tensile Properties of a Cast Eutectic Al–Si–Cu Alloy Modified by Zr and V
Jianbo Sun,Guangkai Zeng,Dewang Rao,Yuchen Wang,Yiwang Yang,Liwen Pan,Zhiliu Hu 대한금속·재료학회 2021 METALS AND MATERIALS International Vol.27 No.12
Minor Zr and V were added individually and jointly to Al–12.5Si–1Cu alloy to develop heat-resistant aluminum alloys. Theas-cast microstructure, room temperature, and high temperature (350 °C) tensile properties and the strengthening mechanismof the modified alloys were investigated. The results show that the rod-like (Al, Si)3Zr and hexagonal (Si, Al)2V precipitatesare respectively found in the alloys with individually added Zr or V. At the same time, they were transformed into (Al,Si)3(Zr, V) and (Si, Al)2(V, Zr) when Zr and V were added together. Individually added Zr or V could change the eutecticsilicon aspect ratio, but the largest effect was recorded for the combined addition 0.3 wt% Zr + 0.4 wt% V. The addition ofZr and V had no significant impact on the room temperature tensile strength of the alloys but improved the yield strength. Individual additions of Zr and V caused negligible improvements in high-temperature tensile strength of alloys tested. Incontrast, the combined Zr + V additions resulted in the substantial improvement with tensile strength at 350 °C reaching79.4 MPa, i.e. 89% higher than the base alloy. The analysis shows that the increase of eutectic silicon aspect ratio and thesolution strengthening of trace V in eutectic silicon is the leading cause of improving high-temperature tensile strength. Thebrittle, blocky primary silicon, coarse rod-like (Al, Si)3(Zr, V), and hexagonal (Si, Al)2(V, Zr) precipitates are detrimentalto high-temperature properties.
A Bi-Target Based Mobile Relay Selection Algorithm for MCNs
( Huijun Dai ),( Xiaolin Gui ),( Zhaosheng Dai ),( Dewang Ren ),( Yingjie Gu ) 한국인터넷정보학회 2017 KSII Transactions on Internet and Information Syst Vol.11 No.11
Multi-hop cellular networks (MCNs) reduce the transmit power and improve the system performance. Recently, several research studies have been conducted on MCNs. The mobile relay selection scheme is a rising issue in the design of MCNs that achieves these advantages. The conventional opportunistic relaying (OR) is performed on the single factor for maximum signal-to-interference-plus-noise ratio (SINR). In this paper, a comprehensive OR scheme based on Bi-Target is proposed to improve the system throughput and reduce the relay handover by constraining the amount of required bandwidth and SINR. Moreover, the proposed algorithm captures the variability and the mobility that makes it more suitable for dynamic real scenarios. Numerical and simulation results show the superiority of the proposed algorithm in both enhancing the overall performance and reducing the handover.
Kim, Dae-Kee,Lim, Jin-Hwi,Lee, Jung A.,Purushottam M. Dewang 이화여자대학교 약학연구소 2009 藥學硏究論文集 Vol.- No.19
A series of trisubstituted imidazole derivatives containing a 4-fluorophenyl group, a pyrimidine ring, and a CN- or CONH₂-substituted benzyl moiety have been synthesized and evaluated for p38α MAP kinase inhibitory activity. Among them. compounds 22c, 27b, and 28b inhibited p38α MAP kinase with IC_(50) values 27.6, 28, and 31 nM, respectively.