Results 21 to 30 of about 143,612 (165)
, 2020 风电场利用风力发电机将风动能转化为电能,其电力生产受诸多因素影响,如风资源状况、风机设计、和风机尾迹等。已有风电场的观测结果显示风机尾迹对风电场电量产出有显著影响,并且风机尾迹湍流会增加下游风机所受疲劳载荷。因此优化风机布置,进而降低风机尾迹影响,对提高风电场性能至关重要,也是风电场设计的关键。在诸多优化工作中,通常由风电场的离散笛卡尔网格得到可能的风机位置。实验观测和模拟结果显示交错风机布置相比于对齐风机布置能更有效地从风资源中提取能量。在本文中,我们将风机交错布置的概念应用于可能风机位置的设计 ...
吴楚畋, 杨晓雷
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Behavioral interventions to reduce demand for threatened freshwater turtles as pets
Conservation Biology, EarlyView.Abstract Growing demand for freshwater turtles as pets has fueled illegal trade and accelerated wild population declines, underscoring the need for theory‐based demand‐reduction interventions. We conducted a three‐part randomized controlled trial with active turtle keepers (n = 1800) in China to test conservation‐ and legality‐framed messages by ...
Wuji Zheng +9 more
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, 2016 编者按：2016年3月31日,南京航空航天大学 王同光教授，在中国科学院流固耦合系统力学重点实验室2015年度学术年会上，做了题为《大型风力机的空气动力学问题》的邀请报告。承蒙作者盛意，本刊在此发布，以飨读者。 王同光教授在工作中 作者简介：王同光，现为南京航空航天大学教授，博士生导师。江苏省风力机设计高技术研究重点实验室主任，江苏省“风能和太阳能发电技术与工程”优势学科带头人，国家973计划项目“大型风力机的空气动力学基础研究”和“
王同光 +1 more
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Exploring legal‐ and health‐risk messaging to reduce demand for elephant skin
Conservation Biology, EarlyView.Abstract Asian elephants (Elephas maximus) are poached for an illegal trade in their skins, which are used in traditional medicine in Africa and Asia. We explored whether messages about the legal and health risks of using elephant skin for medicinal purposes (stomach illness) could reduce such consumption.
Beilu Duan +10 more
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, 2022 本文开展了三种不同湍流来流下的三种不同设计实尺度风机尾迹的致动面(actuator surface,AS)大涡模拟研究。三种风机设计分别为:NREL 5WM风机NREL-Ori,NREL-Root和NREL-Tip,后两者为基于NREL-Ori新设计的风机。相比于NREL-Ori设计,NREL-Root的叶片在靠近叶根处具有更高的载荷,而NREL-Tip设计在叶尖处具有更高载荷。结果显示,三种风机设计在不同湍流来流下叶片上的中载荷一样,但是风机下游尾流特性相差较大。时均场分析表明,在近尾迹处,NREL ...
董国丹, 杨晓雷, 秦建华
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Learning Styles, Engagement and Anxiety in AI‐Mediated Writing: A Multimodal Feedback Study
International Journal of Applied Linguistics, EarlyView.ABSTRACT Artificial intelligence (AI) tools now permeate English academic writing. However, evidence on how feedback modalities align with student differences and with psychological mechanisms remains limited. Prior work often reduced learning styles to simple matches with delivery modes and treated learning engagement and writing anxiety as peripheral.
Yi Ren +3 more
wiley +1 more source
Dianci bileiqi, 2018 海上风力发电产业的蓬勃发展面临日益严重的雷电灾害威胁,为有效指导海上风电机组的雷电防护研究,需要研究海洋环境对海上风场接地系统雷击特性的影响。利用PSCAD软件搭建简化海上风场模型,讨论海洋土壤分层环境下上层海水深度和下层土壤电阻率对风机接地系统雷击暂态响应的影响,分析增加接地体长度对于降低暂态过电压的效果。仿真结果表明:风机遭受雷击后,浪涌会传播至其他相连风机,距离雷击点越远的风机,塔底暂态电位幅值越低。下层海床土壤电阻率越大,风机塔底暂态电位幅值越高。上层海水深度越大,风机塔底暂态电位幅值越小 ...
付国定
doaj
The Development and Validation of the Chinese Vocabulary Levels Test
International Journal of Applied Linguistics, EarlyView.ABSTRACT In response to the increasing need for effective Chinese vocabulary assessments, this study developed the Chinese Vocabulary Levels Test (CVLT), a test designed for intermediate‐level Chinese as a second or foreign language (CSL/FL) learners, based on the vocabulary lists (levels 4–6) from the Chinese Proficiency Grading Standards for ...
Shiwei Qi, Ailan Fu
wiley +1 more source
, 2020 风力发电机(风机)尾迹具有风速低、湍流强度高的特点,这使得其下游风机不仅电量产出低,且所受疲劳载荷高。研究风机尾迹机理是实现风电场优化布置和风机协调控制,进而减轻尾迹不利影响、降低风电成本的关键。该报告将汇报作者在以下四个方面的工作:(1)风机的致动面方法。风机致动盘和致动线模型无法准确捕捉叶片几何和机舱几何的作用。这里将介绍一种可准确捕捉叶片弦长和扭角分布及机舱对周围流场作用的致动面模型。(2)风机尾迹在不同偏航角下的统计特性。通过偏航控制,可以降低风机尾迹对下游风机的影响 ...
董国丹 +3 more
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Designing Integrated Policies for the Twin Transition: Challenges and Tradeoffs
Policy Studies Journal, EarlyView.ABSTRACT Democratic governance faces the intertwined imperatives of managing the transformative risks and opportunities of digitalization, particularly stemming from artificial intelligence (AI), while achieving environmental sustainability within planetary boundaries.
Martino Maggetti
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