Results 31 to 40 of about 10,917 (169)
Functional Ecology, EarlyView.Read the free Plain Language Summary for this article on the Journal blog. Abstract Forests worldwide are increasingly impacted by drought due to climate change, prompting plants to adapt through dehydration tolerance (DT) and avoidance (DA), two distinct physiological strategies.
Xingyun Liang +11 more
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Anomaly Detection for Photovoltaic Based on Improved VMD-XGBoost-BiLSTM Combination Model [PDF]
Photovoltaic is a vital and rapidly developing form of renewable energy generated in China, and anomaly detection is a crucial reference for making decisions on its system operation and maintenance.
Bochao ZHAO, Jiajun MA, Lei CUI, Wenpeng LUAN, Jing ZHU
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Gaoya dianqi, 2020 线路的信道模型是决定中压载波通信性能的关键因素,具有公共屏蔽的三芯中压电缆形成的信道复杂,互相耦合,传统解析计算困难且不易测量,文章首先利用模态分解方法简化三芯电缆通信信道,简化后的信道之间的信号完全解耦,有利于测量及分析;其次,通过有限元分析方法对三芯电缆的分布参数进行计算,基于文中提出的模态分解方法对计算结果进行变换,得到简化后的三芯电缆信道传输线参数。将得到的结果与实测结果对比,验证了模态分解方法以及分布参数有限元计算的正确性。
李岩, 齐磊杰, 刘云鹏
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Representation of obligate groundwater‐dwelling copepod diversity in European protected areas
Conservation Biology, EarlyView.Abstract Groundwaters sustain diverse surface ecosystems and are populated by metazoan species, mostly invertebrates, that provide fundamental ecological functions and are often of prominent conservation value due to narrow endemism and high phylogenetic rarity.
Francesco Cerasoli +7 more
wiley +1 more source
Phased array radar individual recognition based on phase-frequency fusion feature [PDF]
To solve the problem of phased-array radar individual identification in the complex electromagnetic environment with wide spectrum, heterogeneous waveforms and strong energy, an unintentional modulation feature extraction method based on phase and ...
HONG Tao +4 more
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Gaoya dianqi, 2019 油中溶解气体分析是监测电力变压器运行状态最常用的方法之一。针对现有标准对油中溶解气体体积分数预警阈值设定单一和裕度过大等不足,提出了一种基于数据统计和分布模型的220 kV变压器油中溶解气体体积分数动态预警方法。首先,对某电网近10万条220 kV变压器油中溶解气体体积分数数据进行统计与分类处理,并建立了油中溶解气体体积分数的分布模型;然后,根据油中溶解气体体积分数实际预警数据统计结果,通过分布模型的逆累积运算计算得到动态预警值,从而实现了一种油中溶解气体体积分数的动态预警方法;最后 ...
陈太 +6 more
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Shuitu Baochi Xuebao, 2021 以荒漠草原优势植物羊草（Leymus chinensis）、短花针茅（Stipa breviflora）及羊草+短花针茅（Leymus chinensis+Stipa breviflora）枯落物为研究对象，通过模拟试验，采用分解袋法，测定不同枯落物在分解过程中残留率的变化，分析枯落物元素释放规律及分解过程中对土壤性质的影响。结果表明：（1）在整个试验期内，不同枯落物残留率和质量损失率呈慢—快趋势，分解速率表现为羊草+短花针茅 > 短花针茅 > 羊草；试验区枯落物分解可以较好地拟合为Olson模型 ...
蒙仲举, 万芳
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Conservation Biology, EarlyView.Abstract In the western United States, conservation practitioners are increasingly working with private landowners to restore habitat for North American beavers (Castor canadensis) and to use nonlethal mitigation techniques when beavers damage crops and infrastructure.
Brian D. Erickson, Megan S. Jones
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Research on Short-Term Forecasting of Multiple Loads in Integrated Energy Systems Based on Composite Correlation Coefficients [PDF]
ObjectivesTo ensure the stable operation of the power grid, it is crucial to accurately predict the multivariate loads within an integrated energy system.
LI Hui, TU Weiquan, WAN Zheng
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Gaoya dianqi, 2023 文章提出了基于合闸振动信号的变压器振动固有频率识别方法，可以据此来实现对变压器机械状态的评估。首先，文章建立了变压器多自由度非线性轴向振动模型，通过计算得出变压器在发生故障时其固有频率将会发生变化，而振动固有频率可以从变压器的合闸振动信号中提取得到，基于此文章提出了基于变分模态分解和特征系统实现算法结合的变压器固有频率识别方法，并根据固有模态分量的统计特性，提出了基于延时峭度法的模态识别方法，最后通过仿真与实验证明所提方法较传统方法而言可以有效的降低谐波模态的干扰，提高固有频率的识别精度。
马宏忠 +6 more
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