省域水上光伏发电潜力分析评估方法及应用

分布式光伏是土地资源紧张条件下推进“双碳”目标实现的重要途径。水上光伏作为近年来一种创新的分布式光伏开发方式受到了广泛关注，现行政策也对水上光伏开发做出了细致管理规定。提出一种基于遥感信息的水上光伏发电潜力评估方法，旨在为水上光伏发电资源与项目开发的科学论证和精准评估提供一种手段。方法基于开放的遥感影像处理平台获取遥感影像并计算水体指数，通过大津法确定阈值、提取全部水体面积，并利用制图工具ArcMap按照各项影响因素对水面面积逐级折减；然后通过将水体划分成若干格网，计算各格网内可安装光伏水体面积和可配置光伏装机容量；结合典型气象年太阳辐射数据得到水上光伏发电潜力；最后，计算不同开发率下水上光伏发电潜力。以江苏省为例进行了水上光伏发电潜力评估分析并进行了验证，提供了一种在省域范围进行水上光伏发电潜力评估的技术手段

Determination of the number of ψ(3686) events taken at BESIII

The number of ψ(3686) events collected by the BESIII detector during the 2021 run period is determined to be (2259.3±11.1)×106 by counting inclusive ψ(3686) hadronic events. The uncertainty is systematic and the statistical uncertainty is negligible. Meanwhile, the numbers of ψ(3686) events collected during the 2009 and 2012 run periods are updated to be (107.7±0.6)×106 and (345.4±2.6)×106, respectively. Both numbers are consistent with the previous measurements within one standard deviation. The total number of ψ(3686) events in the three data samples is (2712.4±14.3)×10^