摘要：Recently,the newly booming metal halide perovskites have attracted extensive attention worldwide due to their outstanding optoelectronic performance,and are expected to be ideal candidates for photodetectors(PDs).However,there is still lack of perovskite PDs-based imaging devices coming into commercialization stage,due to some practical reasons including toxicity brought by lead-based perovskites and the large light current *** this paper,for the first time we fabricate a lead-free Cs3Bi2Br9 perovskite PD,and build a prototype of this perovskite PD-based imaging system with diffuse reflection imaging ***,we propose a new parameter F related to light current fluctuation to evaluate imaging performance of a PD especially for weak diffuse light condition,and prove its usability by comparison of unoptimized lead-free Cs3Bi2Br9 perovskite PD and atomic layer deposition(ALD)optimized Cs3Bi2 Br9 ***-optimization can improve the quality of perovskite film and suppress the dark current and current ***,we obtain satisfactory diffuse reflection images of 2D and 3D objects with wide dynamic ***,the ALD-optimized Cs3Bi2Br9PD has addressed two major concerns about perovskite PDs-based imaging devices,that may extend application of perovskite materials and improve imaging quality.

摘要：为精确预测水质参数中SS_(eff)(出水SS)含量和COD_(eff)(出水COD)浓度,进一步完善水质预警机制,提出PSOGA-WNN的造纸废水出水水质软测量模型,以获取到的主要水质技术参数:COD_(inf)(进水COD)、Q(进水流量)、pH(进水pH)、SS_(inf)(进水SS)、T(进水温度)、DO(进水溶解氧)、COD_(eff)、SS_(eff)用于预测废水处理厂的废水质量。其中,将PSOGA-WNN的预测结果与PSO-WNN、GA-WNN以及PSOGA-BP的神经网络进行了比较。结果表明PSOGA-WNN神经网络的预测精度最高,这说明基于遗传算法和粒子群算法的PSOGA混合参数优化算法在优化模型预测精度方面具有明显的优越性,WNN神经网络在拟合程度以及误差精度上相比BP神经网络具有一定的优势,是有效的模拟预测手段。

摘要：锂离子电池被广泛应用于电子消费品、动力电池和储能等领域。在动力电池领域,磷酸铁锂和三元锂是两种常用的锂离子电池正极材料。磷酸铁锂由于电子电导率和离子扩散系数低的缺点,其快充性能一直不佳。电解液作为锂离子电池中离子传输的载体,在电池正负极之间起着离子传导的作用,也是磷酸铁锂电池获得快充能力的重要保证。在正负极材料、隔膜材料选型的基础上,基于电解液添加剂的机理分析,优化电解液设计,开发了一款性能良好的磷酸铁锂/石墨电池快充电解液。快充电解液以碳酸乙烯酯(EC)和碳酸甲乙酯(EMC)作为溶剂(质量比为3∶7),以1M的双氟磺酰亚胺锂(LiFSI)为锂盐,以2%碳酸亚乙烯酯(VC)、1%硫酸乙烯酯(DTD)、1%氟代碳酸乙烯酯(FEC)、0.5%三(三甲基硅烷)磷酸酯(TMSP)和0.5%丙烯酸卡必酯(EOEOEA)为添加剂。在4C充电倍率条件下,该电解液25℃常温循环寿命超过1500次,45℃高温循环也超过了1000次,具有很好的实际应用价值。

摘要：当前国家政策要求积极构建“互联网+教育”生态,打造智慧教育体系,因此需要相关学校积极响应国家政策,依托于互联网+时代下,做好校园小程序服务平台的设计。文章以“互联网+”校园小程序服务平台设计与实现为研究对象,首先以校园后勤服务平台为例,介绍了“互联网+”校园小程序服务平台功能需求,随后分析了校园小程序服务平台架构设计,最后对校园小程序服务平台功能设计实现进行了分析,希望能够为相关研究提供一定的参考。