Results 41 to 50 of about 22,578 (158)

滴灌条件下秸秆覆盖与施肥对夏玉米水肥利用效率的影响

open access: yesShuitu Baochi Xuebao, 2016
为探索秸秆覆盖与滴灌施肥结合栽培模式下夏玉米水肥利用效率和增产效果,于2014—2015年在北京市大兴区进行无施肥覆盖(T1)、无施肥不覆盖(T2)、中肥覆盖(T3)、中肥不覆盖(T4)、高肥覆盖(T5)和高肥不覆盖(T6) 6种试验。结果表明:表层土壤温度和气温具有高度线性相关关系,秸秆覆盖可降低夏玉米生长季土壤温度的增温速率,T1、T3和T5较T2、T4和T6处理的土壤增温速率分别降低23.62%,13.65%和11.47%,全生育期秸秆覆盖较不覆盖日均土壤温度平均降低1.75 ...
张婉晴, 王秀茹, 周 杨
doaj  

小麦秸秆长度、覆盖量对坡面产流产沙的影响

open access: yesShuitu Baochi Xuebao, 2020
为定量研究小麦秸秆覆盖对坡面产沙产流过程及减水减沙效益的影响,采用室内人工模拟降雨试验,研究在降雨强度为90 mm/h时,不同秸秆长度和秸秆覆盖量下的坡面产流产沙特征和产流产沙过程规律,结果表明:(1)在相同秸秆长度下,随秸秆覆盖量增加,产流量产沙量极显著减少 ...
曾建辉   +5 more
doaj  

Recent Advances in Chemical Bath Deposition of Electron and Hole Transport Layers for Perovskite Solar Cells and Modules

open access: yesRare Metals, Volume 45, Issue 3, March 2026.
ABSTRACT The development of high‐efficiency, stable, and scalable perovskite solar cells/perovskite solar modules (PSCs/PSMs) highly depends on the performance and cost‐effectiveness of functional layers such as electron transport layers (ETLs) and hole transport layers (HTLs).
Baochang Wang   +11 more
wiley   +1 more source

Detection Algorithm Based on Consecutive FramesSubtraction and Codebook Model [PDF]

open access: yes, 2008
中文摘要:针对视频检测对实时性和准确性的要求, 提出了将帧间差分与码书模型相融合的运动目标检测算法。首先, 选取某个 t 时间内采集到的视频图像作为训练图像, 对图像的每一个像素点建立码书模型。把码书模型中表示前景的码书去除, 余下 的作为背景模型用于检测。检测运动目标时, 先将待检测的相邻帧图像进行帧间差分, 得到变化区域和没有变化的区域, 将 有变化的区域与背景模型进行拟合, 区分出前一帧运动区域和目标运动区域。更新背景模型时以不同的更新方法对前一帧 运动区域和目标运动区域进行更新。 英文摘要 ...
余臻, 陈燕萍
core  

The Role of European Union (EU) Metagovernance in Supporting the Voluntary and Community Sector in Northern Ireland

open access: yesEuropean Policy Analysis, Volume 12, Issue 1, Winter 2026.
ABSTRACT This article argues that European Union (EU) peacebuilding scholarship can benefit from organizational research on the socio‐spatial dynamics of policy implementation. It introduces a strategic‐relational heuristic to address two key gaps: the marginalization of grassroots agency in spatial analyses and the separation of strategy from ...
Giada Lagana, Sioned Pearce
wiley   +1 more source

A Research on Rural Bank’s Credit Risk [PDF]

open access: yes, 2016
作为专门为县域经济服务的中小金融机构,村镇银行等新型农村金融机构被赋予了农村金融改革、发展普惠金融的重大使命,其健康发展对于改善农村金融供求关系具有重要意义。村镇银行大多数设立于农村市场,农业的弱质性和农民的弱势性使村镇银行面临的信用风险日益突出,如何化解风险、加强管理成为促进村镇银行健康发展亟待解决的问题。本文在分析我国村镇银行发展存在问题、信用风险产生的原因以及引入河南中部某村镇银行进行案例分析,得出村镇银行信用风险的防范刻不容缓。一方面村镇银行需要结合区域实际情况,明确市场定位,研发特色金融产品 ...
杜彪
core  

不同地表条件下黑土区坡耕地侵蚀过程中土壤团聚体迁移

open access: yesShuitu Baochi Xuebao, 2011
土壤侵蚀过程中,土壤团聚体的迁移反映了团聚体的破碎程度及径流的搬运能力,直接影响着侵蚀强度。以东北典型薄层黑土区耕层土壤为研究对象,采用模拟降雨试验方法,研究裸露休闲、纱网覆盖与秸秆覆盖3种地表条件下不同粒级(>5mm,2~5mm,1~2mm,0.5~1mm,0.25~0.5mm和秸秆覆盖;(3)纱网覆盖和秸秆覆盖下的团聚体粒级分布与裸露休闲的相比,差异较为明显的均是秸秆覆盖。
安娟, 卢嘉, 郑粉莉, 李桂芳
doaj  

Non‐State Regulators? Civil Society as Extension of the State in a Context of a Regularization Scheme for Undocumented Migrants

open access: yesEuropean Policy Analysis, Volume 12, Issue 1, Winter 2026.
ABSTRACT “Opération Papyrus” was implemented in the Swiss Canton of Geneva between 2017 and 2018 with the aim of granting residence permits to undocumented migrants who met pre‐established criteria. This program serves as an exemplary case of involving nongovernmental actors to facilitate what were originally state‐controlled procedures.
Jan‐Erik Refle   +3 more
wiley   +1 more source

Design and Implementation of Application System on Actual Population Basic Information Sharing in Yunnan Province [PDF]

open access: yes, 2016
人口信息是人类社会宝贵的基础资源,属于社会信息中最核心、最重要的基础信息,是国家制定和实施决策的重要依据,是指导经济建设、政治建设、文化建设、社会建设、生态文明建设的关键要素。人口信息具有信息量大、增长快速、变更频繁、存放分散等特点。人口信息的现代化管理,是有效整合提升政府服务和公共管理能力,建设服务型政府的内在要求,是全社会发展和文明进步的标志之一。 本文对云南省政府各部门人口管理现状及共享需求进行了深入分析,阐明了项目研发过程中存在的困难和问题,确定了研究思路。通过实有人口基础信息共享应用系统的建设,
杨毓鉴
core  

Identifying implementation bottlenecks for maternal and newborn health interventions in rural districts of the United Republic of Tanzania. [PDF]

open access: yes, 2015
OBJECTIVE: To estimate effective coverage of maternal and newborn health interventions and to identify bottlenecks in their implementation in rural districts of the United Republic of Tanzania.
Baker, Ulrika   +6 more
core   +2 more sources

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