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Qingfang Zhang,Yingang Gui,Han Qiao,Xianping Chen,Lingzhi Cao 한국공업화학회 2022 Journal of Industrial and Engineering Chemistry Vol.105 No.-
GIS plays an irreplaceable role in the modern electrical system. However, partial discharge will inevitablyoccur under insulation defect conditions and may lead to serious insulation malfunction. The online monitoringmethod based on gas sensor is a feasible method to diagnose the severity of partial discharge inGIS. In this paper, metal oxide (TiO2, Fe2O3, NiO) cluster-modified single-layer graphene was proposed asa novel gas sensor to detect the characteristic components of SF6 decomposition products, SOF2 andSO2F2. Density functional theory calculations were carried out to study the gas adsorption and sensingmechanisms. The adsorption structures of gas molecules and the metal oxide cluster-modified singlelayergraphene were built and optimized. Then, the most stable structure was selected to analyze the correspondingadsorption parameters. Calculation results showed that metal oxides decoration reduces theenergy gap, improving the electrical conductivity and enhancing the adsorption activity of the graphenesurface. According to DOS and CDD analyses, TiO2 modification obtained the best adsorption effect. Calculation results show that the metal-oxide-modified graphene sensor provides an effective methodfor effectively estimating the operating state of GIS by detecting SF6 decomposition products.
Wenna Ge,Zhiping Zhou,Peng Zhang,Qingfang Zhang,Zhen Cao,Ruilong Zhang,Yongsheng Yan,Jiangdong Dai 한국공업화학회 2018 Journal of Industrial and Engineering Chemistry Vol.66 No.-
Here, a new hierarchical porous carbon was first prepared from sodium lignosulphonate (SLS), an industrial by-product, via a confined carbonization and alkali activation methods using graphene oxide (GO) as template, and was used for ciprofloxacin (CIP) removal. The addition of GO nanosheets remarkably affected the morphology and pore structure. GLHPC-1, obtained at GO/SLS weight ratio of 1:100, possess a largest specific surface area of 3223 m2 g−1 and pore volume of 2.275 cm3 g−1, and thus exhibited an ultrahigh adsorption of 980.4 mg g−1 at 318 K and fast adsorption rate, as well as a good recycle ability in practice.
Qingfang Shi,Xinli Zhang Korean Mathematical Society 2023 대한수학회지 Vol.60 No.3
In this paper, we consider the existence of time periodic solutions for the compressible magneto-micropolar fluids in the whole space ℝ<sup>3</sup>. In particular, we first solve the problem in a sequence of bounded domains by the topological degree theory. Then we obtain the existence of time periodic solutions in ℝ<sup>3</sup> by a limiting process.
Influence of Test Method and Poisson's Ratio Effect on Pullout Performance of Anchor Bolt in Pile
Qing Fang,Zhijun Yang,Chuanyi Zhang,Liming Yi,Xudong Fu 대한토목학회 2020 KSCE JOURNAL OF CIVIL ENGINEERING Vol.24 No.12
The influence of load pattern and Poisson’s ratio effect on the pullout performance of the anchor bolt, which were connected with pipe pile by core concrete, were investigated by three anchorage-beam pullout tests and one self-balanced pullout test. Theoretical and finite element analysis were also employed to explore the influence of load pattern and Poisson’s ratio effect on the ultimate friction at the pipe-core-concrete contact surface. The results show that the load pattern and Poisson’s ratio effect of pipe pile have a great influence on the pullout characteristics of the anchor bolt. The maximum relative displacements between core concrete and pipe pile and between anchor bolt and core concrete in self-balanced pullout test are 0.913 mm and 0.935 mm, respectively, which are significantly greater than that in anchorage-beam pullout test where the displacements are 0.292 mm and 0.500 mm, respectively. In the self-balanced test, the pipe pile is under compression and expands radially due to the Poisson’s ratio effect. In the anchorage-beam test, on the contrary, the pipe pile is under tension and shrinks radially. As a consequence, the ultimate friction between core concrete and pipe pile in the anchorage-beam test is higher than that in the self-balanced test by 15.1% to 28.7%. Accordingly, the results of anchorage-beam pullout test are more sensible for the anchor bolt design.