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Yuepeng Li,Haiyan Liu,Weibo Zhou 보안공학연구지원센터 2016 International Journal of u- and e- Service, Scienc Vol.9 No.11
With the shortage of water resources and water pollution, a series of global water problems have become more and more serious. The development and utilization of traditional water resources can no longer meet the needs of human and social economic development. In this paper, the authors analyze support vector machine algorithm application in the sustainable utilization of regional water resources. We describe the research status of support vector machines and water resources sustainable utilization, and establish the evaluation model of sustainable utilization of water resources based on SVM. By making quantitative analysis and evaluation on the current regional sustainable utilization of water resources, we can understand the existing problems in the development and utilization of water resources, and provides a new basis for the new situation of the development of water resources protection and utilization planning.
Fabrication of W-Cu Alloy via Combustion Synthesis Infiltration Under an Ultra-Gravity Field
Yuepeng Song,Qian Li,Jiangtao Li,Gang He,Yixiang Chen,김형섭 대한금속·재료학회 2014 METALS AND MATERIALS International Vol.20 No.6
Tungsten copper alloy with a tungsten concentrate of 70 vol% was prepared by self-propagating hightemperaturesynthesis in an ultra-gravity field. The phase structures and components of the W-Cu alloyfabricated via this approach were the same as those via traditional sintering methods. The temperature andstress distributions during this process were simulated using a new scheme of the finite element method. The results indicated that nonequilibrium crystallization conditions can be created for combustion synthesisinfiltration in an ultra-gravity field by the rapid infiltration of the liquid copper product into the tungstencompact at high temperature and low viscosity. The cooling rate can be above 100,000 K/s and high stresses intungsten (~5 GPa) and copper (~2.6 GPa) were developed, which passivates the tungsten particle surface,resulting in easy sintering and densifying the W-Cu alloy. The reliability of the simulation was verified throughtemperature measurement and investigation of the microstructure. The W-Cu composite-formation mechanismwas also analyzed and discussed with the simulation results.
Stable Perovskite Solar Cells with Improved Hydrophobicity Based on BHT Additive
Yuelong Huang,Yuelong Huang,Zhu Ma,Hanying Mao,Yuepeng Li,Hua Yu,Changtao Peng 성균관대학교(자연과학캠퍼스) 성균나노과학기술원 2019 NANO Vol.14 No.2
Remarkable progress has been achieved in organometallic halide perovskite solar cells (PSCs). However, poor environmental stability of PSCs has been proved to be challenging and needs further improvement. Here, a strategy of butylated hydroxytoluene (BHT) antioxidant additive with hydrophobic tert butyl and hydrophilic hydroxyl is developed to enhance the hydrophobicity, control nucleation rate and passivate the defect states of perovskite. The tert butyl group effectively prevents the penetration of moisture, as well as the formed hydrogen bond between hydroxyl group and iodine controls the assembly process of BHT and perovskite. By optimizing weight ratio of BHT and MAPbI3 in precursor solution, the power conversion efficiency of PSCs increased from 14.93% to 18.28% and greatly enhanced device stability compared with control device. We believe that our tactic of BHT additive can be applied to various perovskite films and will facilitate the realization of stable perovskite optoelectronics.