Results 11 to 20 of about 34,757 (154)
Scanning, Volume 2022, Issue 1, 2022., 2022 Hydrogen embrittlement can easily occur in high strength martensitic steel, manifesting itself as a sudden failure or fracture without warning and greatly threatening the safety of automotive applications. Optimizing the composition of the alloy can be performed by matching heat treatment processing methods and controlling the precipitation amounts to ...
Bo Liu +8 more
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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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Guangtongxin yanjiu, 1985 本文研究了半导体注入锁定型（IL）激光放大器（LA）的FM噪声性能,给出了一般的FM噪声功率谱的解析表达式,并分为注入锁定和FM信号放大两种情况,探讨了FM噪声功率谱及FM噪声功率的限制因子。理论计算和实验结果是一致的,都证明注入锁定可以大大抑制半导体激光器的FM噪声。
李林林, 杨恩泽, 王之光
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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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Zhejiang Daxue xuebao. Lixue ban, 2002 低声级噪声对人们产生的影响目前尚未引起足够的重视,针对住宅楼底层箱式变压器引起的室内结构声污染,采用模糊数学原理进行了噪声烦恼度研究,发现在低频低噪声环境下 ...
DIGuo-qing(翟国庆) +2 more
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基于EMD-XGBoost模型的交流输电线路可听噪声有效数据预测方法研究
Gaoya dianqi, 2023 背景噪声的存在使得采集输电线路可听噪声时会得到大量的无效数据，影响了可听噪声作为输电线路设计标准时的准确性。为此在夜间收集了可听噪声A声级、可听噪声5 000 Hz以上分量及气象因素，并研究了可听噪声A声级与可听噪声5 000 Hz以上分量以及气象因素之间的相关性。通过建立EMD算法优化的XGBoost模型，对可听噪声5 000 Hz以上分量，气象因素与A声级有效数据之间的相关性进行了验证。结果表明：可听噪声8 000 Hz分量、可听噪声16 000 Hz分量、可见范围 ...
李振华 +4 more
doaj
An adaptive fuzzy median filtering algorithm for salt and pepper noise removal(一种去除椒盐噪声的自适应模糊中值滤波算法)
Zhejiang Daxue xuebao. Lixue ban, 2019 针对传统中值滤波算法降噪性能不佳以及易造成图像细节模糊的问题，提出了一种自适应模糊中值滤波算法。滤波过程分为噪声检测和噪声去除2 个阶段。噪声检测阶段：采用极值法检测噪声，将图像的像素点分为两类，即疑似噪声点和信号点。通过疑似像素点和与其相邻的已处理的像素点的平均绝对灰度差值定义模糊隶属度函数，利用该函数对疑似噪声点是否为噪声进行模糊分类。噪声去除阶段：信号点保持原值输出，对于疑似噪声点的3 种分类结果，采用模糊加权的中值滤波器进行统一处理。实验结果表明，较于多种传统滤波方法 ...
WANFengfeng(万丰丰) +2 more
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Gaoya dianqi, 2021 以1 000 kV特高压交流变电站为研究对象,连续3年在工况基本相同条件下对同一变压器、高压电抗器以及场界噪声进行了测量统计,分析了变电站主要设备噪声的分布情况,变化规律与衰减特性。结果表明,连续3年主变压器平均噪声分别为72.9、73.4、74.6 dB(A),平均每年递增0.6 d B(A),通过频谱分析得出主变噪声逐年增加主要由于冷却风扇噪声增加所致。连续3年高压电抗器室内平均噪声分别为77.0、77.8、79.1 dB(A),平均每年分别递增0.7 dB(A),室外平均噪声分别为65.7、66 ...
车凯 +6 more
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