摘要：Recently, the power conversion efficiencies(PCEs) of all-polymer solar cells(all-PSCs) have increased rapidly. To further increase the PCE of all-PSCs, it is necessary to create new donor polymers matching the polymer acceptors. In this paper, we synthesize a new quinoxaline-based polymer donor PBQ8 with n-octyl side chain on the quinoxaline unit, which possesses the same skeleton structure to the previously reported PBQ5(with isooctyl side chain). The effects of alkyl side chains on the physicochemical properties of the polymer donor were investigated. In comparison with PBQ5, PBQ8 exhibits stronger intermolecular interactions and better molecular packing. When blending with polymer acceptor PY-IT, the PBQ8:PY-IT based devices demonstrated a higher PCE value of 17.04%, which is one of the highest PCEs occurred in the all-PSCs. And the PBQ5:PY-IT(PCE 15.56%, Voc0.907 V, FF 69.72%, and Jsc24.60 m A cm^(-2)) is much lower. The PBQ8:PY-IT blend displayed more efficient exciton dissociation, better molecular stacking properties, preferable phase separation and higher mobility. These indicate that as an effective method, side chain engineering can improve the efficiency of the all-PSCs.

摘要：为优化昆明市共享单车运维资源分配,采用GIS中的核密度分析、聚类与异常值分析等方法,分析昆明市区共享单车分布特征,并对运维资源进行优化分配。研究表明:昆明市区共享单车目前存在的主要问题是乱停乱放和车身张贴小广告等问题,说明目前昆明市区的运维资源的空间布局有待优化;运维资源的空间分布在官渡区、五华区、盘龙区、西山区占比最多,都达到了15%以上,经开区最少运维资源占比仅为5.94%,该研究结果可为昆明市区共享单车运维调度管理提供参考。

摘要：脂类对食品的营养价值和质量都有重要的影响,理解并掌握脂类化学相关专业知识对食品专业的学生是非常重要的。文章对脂类化学在三门食品专业课程中的授课内容和教学设计进行了探讨,利用脂类在日常生活和生产实践中的应用将枯燥的理论知识转化为学生身边的知识,使学生能够在生活中学习,用理论来指导生活和生产,同时也为学生今后从事生产第一线工作或从事科研工作打下坚实的基础。