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Ying Huang,Xuanyi Peng,Yiwen Yang,Haiwei Wu,Xu Sun,Xiaopeng Han 대한금속·재료학회 2018 METALS AND MATERIALS International Vol.24 No.5
Proper process and parameter were investigated to coat Cu or Ni on graphite fl ake (G f ) by electroless plating. Microstructuralcharacterization indicated that the Cu/Ni was coated on the G f uniformly and comprehensively. Then aluminum matrixcomposites reinforced with Si and graphite were fabricated by a unique vacuum gas pressure infi ltration. The thermal conductivityand mechanical properties of the composites, both with and without Cu or Ni coating layers on the graphite surface,have been studied. The obtained results indicated that the mechanical property of the Cu or Ni coated G f /Si/Al compositesdramatically increased, as compared with the non-coated G f /Si/Al composite. In the meantime, Cu or Ni coated G f provedto have better wettability and interfacial bonding with the aluminum matrix, which were expected to be a highly sustainableand dispersible reinforcement for metal matrix composites.
The Comprehensive Recognition Method of Critical Lines Based on the Principal Component Analysis
Hao Guangtao,Lin Zhenheng,Wu Xuanyi,Chen Xuejun 대한전기학회 2023 Journal of Electrical Engineering & Technology Vol.18 No.5
Accurate identification of a few key lines in power system is of great significance to prevent blackout. Traditional key lines are mainly identified by single index such as power grid structure, line load rate and active power of line, which is one-sided. Therefore, in the wide area measurement environment, a multi-dimensional comprehensive identification method of key lines based on principal component analysis is proposed. Firstly, from the aspect of transmission breadth and depth, the utilization index of line is proposed. Secondly, the grid structure, line load rate and line active power index are proposed. Thirdly, based on principal component analysis, a comprehensive identification method of the above four indicators is proposed. Finally, taking the actual power grid as an example, the accuracy of this method is verified by comparing with the traditional method.