Results 21 to 30 of about 1,753 (111)
目的 本国际临床指南由欧洲残疾儿童学会(the European Academy of Childhood Disability,EACD)牵头制定,旨在解决发育性协调障碍(developmental coordination disorder,DCD)的定义、诊断、评估、干预以及与社会心理方面的临床应用关键问题。 方法 本指南针对五个领域的关键问题,通过文献综述和专家团队的正式讨论达成共识。为保证指南的循证基础,以“机制”、“评估”和“干预”为检索词, 对2012年更新以来提出的最新建议以及新增的“社会心理问题”和“青少年/成人”为检索词进行检索。根据牛津大学循证医学中心证据等级 (证据水平 [level of evidence, LOE]1–4) 将结果进行分类,最终转化为指南建议。并由国际 ...
Jing Hua +6 more
wiley +1 more source
海上风电的运维成本占项目总成本的20%以上,控制运维成本的能力已经成为决定风电场运营效益的关键。探索高效、可行的运维管理技术,是大规模开发海上风电急需研究的课题。针对海上风电场维护管理技术中3个重要研究领域,即海上风电场维护策略、运维路径优化和维护调度决策的研究现状进行了系统综述。针对目前存在的维护策略相对单一、路径优化求解困难以及维护调度决策模型过于理想等问题,提出了未来海上风电维护管理技术的研究趋势:机组不同部件将采用不同维护策略以最小化综合运维成本 ...
刘永前, 马远驰, 陶涛
doaj +1 more source
区域电网的黑启动能力是电力系统安全运行的重要保障之一。随着风电和光伏发电在系统中占比越来越高,特别对于风电装机占比高但水电少、甚至无水电的地区,风电结合储能能否作为黑启动电源受到研究者关注。结合黑启动方案规范,设计了基于多储能系统的风电场黑启动方案,提出风-储联合系统黑启动过程的4个主要阶段,并提出以持续有效出力概率计算风电汇集地区全年能满足黑启动的时段占比,衡量地区风电黑启动成功概率。最后基于PSCAD对简化的风-储联合系统仿真储能自启动、风电场启动及火电机组辅机启动3个过程,初步从暂态层面验证了风 ...
李翠萍 +6 more
doaj +1 more source
Cs2SnI6: A Perovskite‐Based Electromagnetic Wave Absorbing Material
ABSTRACT Lead halide perovskites and carbon‐based materials are interesting, high‐performing electromagnetic wave absorbing materials. However, only a few studies have been carried out to examine in detail the electromagnetic wave absorption properties of these materials.
Fei Han +11 more
wiley +1 more source
Mistimed surveys lead to underestimated migratory bird impacts from wind farms
Current guidance and approaches to surveying migratory birds at windfarm developments in Australia are insufficient. Evidence‐based alignment with seasonal presence is needed to improve biodiversity assessment standards, ensuring renewable energy expansion proceeds in a way that better safeguards migratory species and supports global biodiversity and ...
Xu Shi +7 more
wiley +1 more source
35kV交流汇集是目前海上风电场集电系统的通用集电方案。随着对海上风场单位成本降低的追求和技术的发展,海上风机单机容量越来越大。然而,由于35kV海底电缆热极限和通流能力的限制,单机容量的增大使得单根海缆上可连接的风机数目随之减少。随着海上风电场规模的扩大和单机容量的增加,如果仍采用35kV交流集电方案,海底电缆的数目势必增加,电缆投资及相应工程费用和难度也将增大。据此,提出了66kV交流集电方案,并基于一组典型案例,对35kV和66kV海上风电交流集电方案进行了技术经济性比对 ...
蔡蓉 +4 more
doaj +1 more source
Accelerating Just Energy Transitions in Brazil: Pathways for Social Development
ABSTRACT This critical article analyzes energy poverty in Brazil from the theoretical perspective of distributive justice, proposing the implementation of a new social regulation called Contribution to Social Development. The goal is to support the process of a just energy transition leading to a broader debate on energy planning and social issues ...
Marcio Giannini Pereira +5 more
wiley +1 more source
应用于海上风电接入的VSC-HVDC系统主网侧交流故障穿越方案 [PDF]
海上风电是可再生能源的重要形式和组成部分,通过基于电压源换流器的高压直流输电(VSC-HVDC)技术进行风电的远距离接入,使远离海岸的区域建设风电场成为可能,另外该技术也具备更大规模风场的接入能力。目前世界范围已有多个应用VSC-HVDC输电系统将海上风电场接入到陆上主电网的工程规划。然而,大规模风电会对系统的稳定性带来诸多挑战,尤其需要确保在故障工况下风电场及主电网的稳定性,VSC-HVDC以其优良的灵活性成为应对此类挑战的不二选择。本文对不同风电接入方式下系统的故障穿越方案进行了总结,对VSC ...
王国英 +3 more
doaj +1 more source
ABSTRACT Time and chronology form the invisible architecture upon which modern civilization depends, governing synchronization across markets, power grids, communication networks, transportation, and defense. Yet, this shared temporal framework, engineered through atomic clocks, satellites, and digital synchronization, faces growing vulnerabilities ...
Bilal M. Ayyub
wiley +1 more source
ABSTRACT Existing literature largely agrees that authoritarian regimes establish channels for political participation to gather valuable information on citizens' anti‐regime sentiments and policy preferences and to supervise lower‐level bureaucrats and firms.
Anton Bogs
wiley +1 more source

