微生物燃料电池(microbial fuel cell, MFC)是利用电化学技术将微生物代谢能转化为电能并可同时降解废水的一种装置. 本文针对目前MFC输出功率密度小、 工作效率低等缺点, 提出了利用半导体光催化和微生物催化协同作用构建新型MFC体系的设想, 即将半导体太阳能电池串入MFC体系, 组成"光电池-微生物电池"新型电池体系. 实验结果表明, 在光照的作用下, 新型MFC 体系的开路电压、短路电流和最大输出功率密度, 与普通MFC体系相比, 均有了明显的提高. 光电催化作用的引入, 有效地改善了MFC体系阴极的接受电子的能力, 使阳极提供电子的能力得到最大限度的发挥, 既给MFC体系的运转提供了一部分动力, 也为MFC体系提高污染物的降解速率提供了基础. 此项研究对解决能源危机和环境污染具有重要意义.

In order to solve the problem of effective communication in the network, low power wide area network (LPWAN) technology can complement 5G network because of its advantages of wide coverage, low power consumption and low cost. For 5G smart grid based on Lora, this paper first analyzes its network architecture. Then, aiming at the application of smart grid, a multi-mode and multi priority communication network scheme is proposed. After that, this paper further analyzes the format and characteristics of Lora packet in the scheme, mainly considers three basic parameters: code rate (CR), spread spectrum factor (SF) and bandwidth (BW), and simulates the influence of these factors on packet transmission delay and transmission rate. Finally, we test the performance of network coverage in open area and dense urban area, and compare the performance through delay and received signal strength. This paper provides a theoretical and testing basis for the wide area coverage of 5G network.