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SHUQUAN CHANG,Chengcheng Liu,Heliang Fu,Zheng Li,Xian Wu,Jundong Feng,Haiqian Zhang 성균관대학교(자연과학캠퍼스) 성균나노과학기술원 2018 NANO Vol.13 No.12
In this study, a double-solvent radiation method is proposed to prepare silver nanoparticles in the pores of metal-organic framework MIL-101(Cr). The results reveal that well-dispersed silver nanoparticles with a diameter of about 2 nm were successfully fabricated in the cages of monodisperse octahedral MIL-101(Cr) with a particle size of about 400 nm. The structure of MIL-101(Cr) was not destroyed during the chemical treatment and irradiation. The resulting Ag/MIL-101 exhibits excellent catalytic performance for the reduction of 4-nitrophenol. This method can be extended to prepare other single or bimetallic components inside porous materials.
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Jia Dexiang,Li Xinda,Guo Shaodong,Liu Fang,Fu Chengcheng,Huang Xingde,Dong Zhen,Liu Jing 대한전기학회 2024 Journal of Electrical Engineering & Technology Vol.19 No.3
On the one hand, as a substitute for traditional fuel vehicles, electric vehicles (EV) is an important measure to achieve “carbon peak and carbon neutralization” in transportation. On the other hand, as an energy storage unit in the new power system, it can make up for the disadvantages brought by renewable energy power generation. Therefore, scientifc and efective evaluation of EV benefts is the premise to promote the development of EV. In view of the characteristics of EV involving many interest groups and huge market potential, this paper introduces the comprehensive evaluation theory in operations research: analytic hierarchy process (AHP) and entropy weight method, and combines the respective advantages of the two methods to avoid the distortion of evaluation results caused by a single evaluation method. First of all, under the background of building a new power system and realizing a powerful automobile country, the EV promotion beneft evaluation index system is constructed from fve frst-class indexes and 18 s-class indexes of consumers, distribution network, charging network, social beneft and environmental beneft. Then, aiming at the shortcomings of single evaluation method, the subjective and objective combination method of AHP entropy weight method is established to solve each weight index, so as to realize the scientifc quantifcation of the index. Finally, a certain area of a coastal city is selected for example analysis. The results show that the evaluation method established in this paper has a positive efect on EV promotion, and can provide suggestions for EV promotion.
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Dirac semimetal-enabled multi-bit coding metasurface for dynamic manipulation of terahertz beams
Zhang Yonggang,Yin Kehao,Liang Lanju,Yao Haiyun,Yan Xin,Hu Xiaofei,Huang Chengcheng,Qiu Fu,Zhang Rui,Li Yuanping,Wang Yaru,Li Zhenhua,Wang Ziqun 한국물리학회 2024 Current Applied Physics Vol.58 No.-
In this study, a switchable multi-bit coding metasurface that is applied under a terahertz (THz) frequency by adjusting the Fermi level (EF) of Dirac semimetals (DSMs) is proposed. At a EF of 0.2 eV, a 1-bit coding metasurface can be applied in the 2.58–2.62 THz. At 0.3 eV, a 3-bit coding metasurface is realized at 1.88 THz, and at 0.05 eV, the phase of the coding units coincides in the 1.5–3 THz. So, different functions of the metasurface can be realized. The proposed coding metasurfaces has promising applications in terahertz communication.
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