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一种基于相关系数矩阵的TOPSIS决策方法 总被引:1,自引:0,他引:1
在多属性决策分析中,传统的TOPSIS法是基于欧氏距离来计算各方案到正负理想点的距离,但欧氏距离没有考虑各属性之间的相关性;从这一角度出发,将相关系数矩阵与欧式距离结合,从而弥补了欧氏距离的不足,最后进行了实例分析. 相似文献
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SAPO-11分子筛的性质与催化应用 总被引:5,自引:0,他引:5
随着世界经济的增长,对能源的需求日益加大.石油作为当今世界最重要的能源之一,必将进一步得到发展,因此炼油工业在21世纪仍将保持其在能源利用方面的主导地位.在我国,流化催化裂化装置(FCCU)因对原料的适应性强、轻质油产品收率高、汽油的辛烷值高等优点,一直是炼油厂 相似文献
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Device simulation of quasi-two-dimensional perovskite/silicon tandem solar cells towards 30%-efficiency 下载免费PDF全文
Xiao-Ping Xie 《中国物理 B》2022,31(10):108801-108801
Perovskite/silicon (Si) tandem solar cells have been recognized as the next-generation photovoltaic technology with efficiency over 30% and low cost. However, the intrinsic instability of traditional three-dimensional (3D) hybrid perovskite seriously hinders the lifetimes of tandem devices. In this work, the quasi-two-dimensional (2D) (BA)2(MA)n-1PbnI3n+1 (n=1, 2, 3, 4, 5) (where MA denotes methylammonium and BA represents butylammonium), with senior stability and wider bandgap, are first used as an absorber of semitransparent top perovskite solar cells (PSCs) to construct a four-terminal (4T) tandem devices with a bottom Si-heterojunction cell. The device model is established by Silvaco Atlas based on experimental parameters. Simulation results show that in the optimized tandem device, the top cell (n=4) obtains a power conversion efficiency (PCE) of 17.39% and the Si bottom cell shows a PCE of 11.44%, thus an overall PCE of 28.83%. Furthermore, by introducing a 90-nm lithium fluoride (LiF) anti-reflection layer to reduce the surface reflection loss, the current density (Jsc) of the top cell is enhanced from 15.56 mA/cm2 to 17.09 mA/cm2, the corresponding PCE reaches 19.05%, and the tandem PCE increases to 30.58%. Simultaneously, in the cases of n=3, 4, and 5, all the tandem PCEs exceed the limiting theoretical efficiency of Si cells. Therefore, the 4T quasi-2D perovskite/Si devices provide a more cost-effective tandem strategy and long-term stability solutions. 相似文献
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食用植物油目前基本上已由产油量高的浸出法生产取代了过去低产量的机榨油.然而浸出法产的油中残留溶剂却是危害身体健康的物质.因此,严格测定控制残溶量事关重大.本文着重介绍了粮油食品专用气相色谱仪的应用情况,试验结果表明,该仪器对食用植物油中残溶测定具有快速、准确、灵敏度高、线性范围宽等特点,并符合国标法关于食用植物油残溶量的测定要求.1 试验部分1.1 主要仪器与仪器工作条件CX-206A粮油食品专用气相色谱仪(南京分析仪器厂) 相似文献
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开展探究实验教学凸现物理课堂魅力--新课程理念下初中物理实验教学探索 总被引:1,自引:0,他引:1
由于受“应试教育”思想的长期影响,中学物理实验教学中存在着一些误区,如,轻实验,重理论;回避难做的实验;以电脑上制作的课件取代实验操作.这些做法均忽视了物理实验的重要作用.现在“教师讲学生同步做”的物理实验教学方法已遭遇普遍质疑,物理实验教学开始走向另一个极端——过分的求放、求活.如此一来,物理实验教学中的“四基”即基础知识、基本技能、基本态度、基本能力的落实又让教师担心. 相似文献
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