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Xiaorui Ren,Huanhuan Li,Ke Liu,Hongyi Lu,Jingshuai Yang,Ronghuan He 한국섬유공학회 2018 Fibers and polymers Vol.19 No.12
Poly(vinylpyrrolidone) (PVP), as the low-cost and commercial material, exhibits superior phosphoric acid doping capability due to the presence of heterocycle and carbonyl groups in the repeat unit. However, it can’t be used as the high temperature polymer electrolyte membrane (HT-PEM) alone because of its significant hydrophilicity and poor mechanical stability. In the present work, polyethersulfone (PES), polysulfone (PSU), polyetherketone-cardo (PEK-c), polyvinylidene fluoride (PVDF) and poly(vinylidene fluoride-co-hexafluoropropylene) (PHFP), five kinds of engineering thermoplastics with excellent mechanical properties and chemical inertness, are chosen to prepare a series of PVP blend membranes by the polymer blending method in order to enhance the dimensional and mechanical stabilities of PVP based membranes. The influence of structures of enhanced polymers on properties of HT-PEMs was investigated systematically. PVP blend membranes with aromatic polymers (i.e. PES, PSU and PEK-c) exhibited decreased volume swellings, increased acid doping contents, superior conductivities and improved mechanical strengths, which determined that they are more suitable for electrolytes of fuel cell applications comparing with PVP/PVDF and PVP/PHFP membranes blended with aliphatic polymers.
Zhao Fuping,Liu Rongmei,He Bei,Zheng Ke,Hu Xiaorui,Ji Jing,Hui Yan 보안공학연구지원센터 2016 International Journal of Grid and Distributed Comp Vol.9 No.9
More and more electric vehicles have been used in China, and many charging station has been built in China. Due to the reactive power loss caused by charging devices, the method to measure the power consumed by charging device is critical for power company. Based on impact loads generated by electric vehicles to the grid in fast charging mode, this paper studies the energy measurement method of electric vehicle charging mode. Since each phase current of charging post imbalance, to prevent the sum of each phase current vector of charging posts over the protection current threshold and the charging post breaker misusing in power circuit, preventing leakage circuit breaker current imbalance system is designed. Finally, this paper studies the power consumption detection methods of electric vehicle charging posts. By comparing the fast Fourier transform and wavelet analysis algorithms, an electric energy measurement device of electric vehicle charging machine based on FFT and wavelet analysis are proposed. Combined with fast data processing functions of DSP, the device can quickly and accurately measures electric vehicles charging amounts under different charging modes.
Lei Ma,Tingwei Huang,Han Qiu,Zhangxian Yang,Xiaorui He,Jiazhong Qian 한국지질과학협의회 2021 Geosciences Journal Vol.25 No.5
The current study aims to identify the hydrogeochemical characteristics, formation mechanism and evolution law of shallow groundwater in Dangshan, China, and to evaluate the suitability of the groundwater for irrigation. In this study, ninety-six samples were taken to investigate the hydrogeochemical characteristics of shallow groundwater in Dangshan County. The geographic information system (GIS) method was used to analyse the spatial distribution characteristics of total dissolved solids (TDS). Gibbs diagram, Binary relation analysis and reverse geochemical reaction simulation method were utilised to reveal the main formation mechanism of relatively high TDS in this region. The results show that water-rock interaction and evapotranspiration are the main mechanisms for controlling the chemical evolution of shallow groundwater in wet and dry seasons in the study area, respectively. The main waterrock interactions in the study area include dissolution of halite and dolomite, the precipitation of gypsum, as well as cation exchange and adsorption. Suitability of shallow groundwater quality for irrigation use was evaluated according to the sodium adsorption ratio (SAR) and the electrical conductivity (EC) with a United States Salinity Laboratory (USSL) diagram. Meanwhile, GIS technology was used to demonstrate the spatial distribution of irrigation suitability variations. Based on the spatial interpolation result on the USSL salinity diagram classification, the shallow groundwater in 89% of the study area is suitable for irrigation, while 11% of the area is unsuitable for irrigation.