Results 21 to 30 of about 14,295 (168)
Jianzhu Gangjiegou Jinzhan, 2021 结合半潜式和单立柱式海上风机浮式基础的特点,提出了一种用于海上风机的新型钢格构式基础。首先,根据美国可再生能源实验室(National Renewable Energy Laboratory,NREL)提供的5 MW海上风机样机对提出的新型浮式基础进行了结构设计。然后,采用水动力-空气动力-控制系统-系泊系统耦合方法对风-浪联合作用下的新型海上浮式风机的动力响应进行了分析。结果表明:钢格构式浮式基础的纵荡运动主要受风速变化影响,纵摇运动受风速-波浪变化的显著影响,而垂荡运动主要受波浪变化控制 ...
张浩, 王宇航, 闫渤文, 周绪红
doaj
Exploration for effects of acoustic stimulus on movement behavior and HSP70 expression of two kinds of marine crustaceans [PDF]
, 2016 水下噪声会潜在的引起海洋生物紧张，分散和掩蔽这些海洋生物重要的声信号，进而对海洋生物的行为和生存造成影响。近几十年来，随着人类社会的不断发展，人们将发展目光投向了占有全球71%面积的海洋。伴随海洋事业的快速发展，海洋工程噪声对海洋生物的影响引起了人们的极大关注。虽然目前已有不少研究成果评估了水下工程噪声对海洋生物的影响，这些噪声包括轮船、打桩、地震勘探以及风电场等水下噪声，表明海洋工程等人为噪声对鱼类以及海洋哺乳动物都将造成了不同程度的影响和伤害。但是 ...
周韦峥嵘
core
, 2017 The damage of wind turbine blades suffered lightning strikes has been a key factor of the safe and reliable operation of wind farms. The electric geometrical model of wind turbine blades (EGMTB) was presented based on the traditional electric geometrical
Guo, Zixin +8 more
core +1 more source
Wildlife Letters, EarlyView.We examined changes in perceived risks associated with chronic wasting disease (CWD) and perceived trust in wildlife agencies over time across 10 studies in eight states. Results indicated that perceived risks to both deer and humans declined the longer the disease had been in a state. Results also indicated that agency trust evaluations were positive,
Jerry J. Vaske, Craig A. Miller
wiley +1 more source
Optimal control of multi-zone vav air-conditioning system [PDF]
, 2017 2006-2007 > Academic research: refereed > Publication in refereed journalVersion of ...
Wang, SW, Xu, XH
core
, 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
core
Hobbyist preferences for pet freshwater turtles
Conservation Biology, EarlyView.Abstract The burgeoning pet trade is a primary threat to wild freshwater turtles worldwide. Although the risks from commercial exploitation of turtles have been discussed widely, there is little empirical research on preferences for pet turtles from a hobbyists’ perspective.
Jingjing Zhao +7 more
wiley +1 more source
Gaoya dianqi, 2022 风电集中接入的直流外送系统发生线路故障、换相失败及直流闭锁等问题时，可能引起风机大规模高压脱网，对其风险进行评估意义重大。在风机高压脱网原因分析的基础上，文中建立了衡量故障发生可能性的概率模型，对不同故障严重程度下的脱网容量、电压越限等量化指标进行计算，进而提出了系统直流侧故障引起风机高压脱网的风险评估方法。在上述工作基础上，文中基于PSCAD/EMTDC软件搭建了典型风电直流外送系统的电磁暂态仿真模型，获得了不同故障下系统暂态特性及各故障的后果严重程度 ...
洪扬, 惠思思, 宋莹
doaj
Marketing stategy on inovance low-voltage frequency converter [PDF]
, 2015 摘要 近年来，随着国民经济和工业发展的内在需求，国内自动化行业蓬勃发展，以变频器为代表的工业自动化设备越来越受到重视并广泛应用，市场孕育了像汇川、英威腾，新时达等上市企业，市场总量以GDP两倍的速度，每年保持着10%以上的增长率。 国务院2012年8月6日印发的《节能减排“十二五”规划》具体目标中明确提到：到2015年，单位工业增加值（规模以上）能耗比2010年下降21%左右，主要产品（工作量）单位能耗指标达到先进节能标准的比例大幅提高，三相异步电动机的能效从90%提升到92%-94%。同时 ...
胡波
core
When and why to give shorebirds a head start
Conservation Biology, EarlyView.Abstract Headstarting is a translocation technique involving the hatching or rearing of wild eggs or young in captivity and the release of those individuals back to the wild at or before independence. It has been trialed as a conservation intervention for shorebirds over recent decades to improve the population trend of target populations by increasing
Lynda Donaldson +4 more
wiley +1 more source