我国化肥投入面源污染控制政策评估

根据环境政策评估的一般模式,从政策目标、政策实施状况、政策手段、管理体制和机制等方面对我国化肥投入面源污染控制政策进行了初步的评估。评估认为我国化肥投入面源污染控制政策各层次目标存在不一致性并缺少关联性,政策实施效果并不明显,部分政策对污染控制甚至起着相反的作用。测土配方施肥技术推广政策、有机质提升支持政策、农资综合补贴政策和对化肥生产企业的税收与补贴政策在制定和实施中也存在着各种问题。在分析这些问题的基础上,提出相应的建议

A standardized checklist on meta-analysis reporting in the open science era

荟萃分析(又称元分析)以量化方式综合实证研究结果,是积累整合证据并推进基础与应用研究的重要工具.在开放式科学这种新型研究实践下,荟萃分析是整合开放数据、进行科学推断的重要手段.但荟萃分析的过程繁复、方法多样,其执行上的严谨性对荟萃分析质量影响较大,因此报告的透明性和开放性对其结果的可重复性尤为重要.为了解中文荟萃分析报告规范性的现状,让更多研究者了解荟萃分析报告的规范性与透明性,提升荟萃分析报告的质量,本文以国际学界广泛使用的系统综述和荟萃分析优先报告条目(Preferred Reporting Items for Systematic reviews and Meta-Analyses, PRISMA)以及开放式科学理念为基础,结合基于效应量的荟萃分析报告特点,拟定《开放与可重复荟萃分析的报告清单》(Preferred Reporting Items for Open and Reproducible Metaanalysis, PRIOR-MA),并以心理学中的荟萃分析为例,对近五年国内发表的68篇中文荟萃分析的方法和结果部分进行回顾.基于结果,本文建议荟萃分析报告需要在以下方面进一步加强其开放性与透明性:文献搜索的时间及限制、研究筛选和数据收集过程的细节、文章筛选的流程图、效应量转换的细节、单个研究偏倚状况的评估等.本文为开放式荟萃分析提供了一个较为全面的报告清单(PRIOR-MA),为未来荟萃分析研究提供了参考.</p

2002–2010年中国典型生态系统辐射及光能利用效率数据集

辐射是陆地生态系统能量的主要来源,其利用效率表现为光能利用率,反映了生态系统转化光能、生成有机物质的能力。揭示典型生态系统的辐射及光能利用效率可以为评估区域光能资源及其利用效率提供参考,也为评估区域有机物质固定能力及碳吸收能力提供依据。基于中国陆地生态系统通量观测研究联盟(China FLUX)的长期观测结果及已发表文献的公开数据,构建了2002–2010年中国典型生态系统辐射及光能利用效率数据集,包含51个生态系统126个站点年辐射、光能利用效率及吸收光能利用效率的观测记录。另外,本数据集还包含生态系统代码、年份、经度、纬度、海拔、生态系统类型、年均气温、年总降水量、年均CO2质量浓度、年均叶面积指数、最大叶面积指数等生物气候信息。本数据集可以为评估生态系统生产能力、应对气候变化等方面的研究提供数据支持

JUNO Sensitivity on Proton Decay p→νˉK+p\to \bar\nu K^+ Searches

The Jiangmen Underground Neutrino Observatory (JUNO) is a large liquid scintillator detector designed to explore many topics in fundamental physics. In this paper, the potential on searching for proton decay in $p\to \bar\nu K^+$ mode with JUNO is investigated.The kaon and its decay particles feature a clear three-fold coincidence signature that results in a high efficiency for identification. Moreover, the excellent energy resolution of JUNO permits to suppress the sizable background caused by other delayed signals. Based on these advantages, the detection efficiency for the proton decay via $p\to \bar\nu K^+$ is 36.9% with a background level of 0.2 events after 10 years of data taking. The estimated sensitivity based on 200 kton-years exposure is $9.6 \times 10^{33}$ years, competitive with the current best limits on the proton lifetime in this channel

JUNO sensitivity on proton decay p → ν K + searches*

The Jiangmen Underground Neutrino Observatory (JUNO) is a large liquid scintillator detector designed to explore many topics in fundamental physics. In this study, the potential of searching for proton decay in the $p\to \bar{\nu} K^+$ mode with JUNO is investigated. The kaon and its decay particles feature a clear three-fold coincidence signature that results in a high efficiency for identification. Moreover, the excellent energy resolution of JUNO permits suppression of the sizable background caused by other delayed signals. Based on these advantages, the detection efficiency for the proton decay via $p\to \bar{\nu} K^+$ is 36.9% ± 4.9% with a background level of $0.2\pm 0.05({\rm syst})\pm$$0.2({\rm stat})$ events after 10 years of data collection. The estimated sensitivity based on 200 kton-years of exposure is $9.6 \times 10^{33}$ years, which is competitive with the current best limits on the proton lifetime in this channel and complements the use of different detection technologies