Results 11 to 20 of about 1,521 (104)
Study becomes insight: Ecological learning from machine learning
Methods in Ecology and Evolution, Volume 12, Issue 11, Page 2117-2128, November 2021., 2021 Abstract The ecological and environmental science communities have embraced machine learning (ML) for empirical modelling and prediction. However, going beyond prediction to draw insights into underlying functional relationships between response variables and environmental ‘drivers’ is less straightforward.
Qiuyan Yu +5 more
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Trends and knowledge gaps in field research investigating effects of anthropogenic noise
Conservation Biology, Volume 35, Issue 1, Page 115-129, February 2021., 2021 Abstract Anthropogenic noise is a globally widespread sensory pollutant, recognized as having potentially adverse effects on function, demography, and physiology in wild animals. Human population growth and associated changes in urbanization, transportation, and resource extraction all contribute to anthropogenic noise and are predicted to increase in ...
Paul Jerem, Fiona Mathews
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Effects of spatial autocorrelation and sampling design on estimates of protected area effectiveness
Conservation Biology, Volume 34, Issue 6, Page 1452-1462, December 2020., 2020 Abstract Estimating the effectiveness of protected areas (PAs) in reducing deforestation is useful to support decisions on whether to invest in better management of areas already protected or to create new ones. Statistical matching is commonly used to assess this effectiveness, but spatial autocorrelation and regional differences in protection ...
Pablo Jose Negret +5 more
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Decision‐support tools for dynamic management
Conservation Biology, Volume 34, Issue 3, Page 589-599, June 2020., 2020 Abstract Spatial management is a valuable strategy to advance regional goals for nature conservation, economic development, and human health. One challenge of spatial management is navigating the prioritization of multiple features. This challenge becomes more pronounced in dynamic management scenarios, in which boundaries are flexible in space and ...
Heather Welch +4 more
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Gaoya dianqi, 2019 随着电网系统的快速发展,大容量、高电压电力变压器不断增多,其振动与噪声对设备自身及周边居民的健康造成的影响日益凸显,因此变压器振动与噪声及其控制受到了国内外学者的广泛关注。文中从变压器振动噪声机理、特性、影响因素以及控制措施等方面对国内外研究进展进行综述。分析了硅钢片的磁致伸缩特性及Maxwell应力特性,得出铁心振动噪声的主要来源及数学模型;根据绕组磁场分布及受力分布,分析了绕组轴向及幅向振动特性及数学模型;总结了冷却设备等部件的振动特性。从振动产生、传递到噪声辐射等过程分析了变压器传播特性。从激励 ...
汲胜昌, 师愉航, 张凡, 陆伟锋
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Dizhen xuebao, 2019 利用中国地震台网880个宽频带地震台站2014年1月至2015年12月的垂直分量连续波形记录，通过计算每个台站的噪声功率谱密度和概率密度函数，对中国大陆地区的台基噪声水平进行了初步分析。结果表明：中国大陆的噪声水平在不同频带呈现不同的分区特性，其中高频带（0.1—1 s）噪声水平在西部和北部较低，而在中东部地区较高，京津冀和东南沿海地区最高；城市噪声水平高于人口稀少地区，表明高频带噪声与交通、工业等人文活动强度具有较高的相关性；在盆地及其边缘地区，高频带噪声水平高于周边山区，可能与沉积层的放大效应有关 ...
Fang Wang +4 more
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Gaoya dianqi, 2016 超/特高压交流变电站噪声特性对于其噪声预测与控制具有重要意义。以750 k V交流变电站为研究对象,对变电站内变压器、高压电抗器、带电架构以及站界噪声水平、频谱分布以及衰减特性进行了系统测量与分析。结果表明,750 k V变电站噪声水平较高,变电站各主要噪声源之间存在相互影响,变压器500 Hz以下的中低频噪声水平较高,冷却系统对变压器频谱分布具有较大影响,电抗器噪声最高可达80.3 d B（A）,带电架构噪声最低为61.2 d B（A）,站界噪声分布与变电站内各主要声源的布置方式有关。
裴春明 +5 more
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Gaoya dianqi, 2021 为评估和分析特高压并联电抗器隔声罩降噪效果,对特高压并联电抗器周围声场进行测试,明确100 Hz是电抗器噪声能量的主要成份,在比较分析隔声性能的3个指标后,依据相关标准,对并联电抗器隔声罩进行插入损失和噪声衰减测试。结果分析表明,随着距离的增加,200 Hz及以上频率的损失值明显大于100 Hz的损失值,同时加装隔声罩后的噪声源强衰减量在14～18 dB（A）之间,且隔声罩与电抗器本体的振动频率特性一致,这说明对并联电抗器加装隔声罩只是降低了周围声场的声压值,并没有消除隔声罩外因100 ...
倪园 +4 more
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Gaoya dianqi, 2019 变压器噪声控制作为高压输变电工程中亟待解决的问题成为研究热点。文中对特高压变压器的噪声进行测量分析,得到变压器噪声的主频点。以设计具有通风、占用面积小、不导电不导磁、隔声性能好的声屏障为目标,借鉴希尔伯特射频天线结构,提出一种适用于变压器降噪的声学超材料结构。通过有限元数值模拟,研究了声学超材料单胞的隔声特性。在此基础上,选择声学超材料单胞的参数,使其共振频率点避开变压器噪声的主频点,获得了较高的传声损失。采用阻抗管实验测量了声学超材料在变压器噪声主频点的传声损失,结果表明 ...
王天正 +5 more
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Gaoya dianqi, 2022 为满足公众对架空输电线路可听噪声问题日益增长的关注，论文总结了超特高压输电线路涉及到的可听噪声问题。阐述了交流、直流线路可听噪声的差异；归纳了可能对架空输电线路可听噪声带来影响的因素，分为线路自身结构和天气等环境因素两类；介绍了国内外可听噪声的限值标准、试验方法以及预测方法，归纳了各国对可听噪声问题的处理措施。论文发现：随着直流线路电压等级的提高，可听噪声限值标准也在增大，而当前直流可听噪声问题研究极少；金具间隙放电产生的可听噪声问题也应引起重视，理清了交流线路和直流线路在可听噪声的特性、影响因素 ...
张海兵 +4 more
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