Results 41 to 50 of about 12,210 (170)
Detection method of wind speed anomaly fluctuation based on SSA−LSTM [PDF]
Aiming at the problem of high leakage rate and false alarm rate of traditional statistical methods for abnormal fluctuation in sensor monitoring data caused by dampers opening and closing, a SSA-LSTM wind speed abnormal fluctuation detection method based
Jian LIU +3 more
core +1 more source
Conservation Biology, EarlyView.Abstract Human development is a driver of global change and a major threat to biodiversity. Protected areas maintain and support biodiversity, but outside stressors, such as climate change and land use change, can negatively influence natural resources within protected areas.
Leah J. Rudge +2 more
wiley +1 more source
Zhendong Ceshi yu Zhenduan针对煤矿锚杆钻车姿态估计中惯性导航的多源噪声，提出一种基于噪声敏感先验的改进变分模态分解（variational mode decomposition，简称VMD）惯导异构信号降噪方法。首先，利用加速度和角速度时频域参数特性变化，探究捷联惯导异构信号的噪声敏感差异和多源噪声作用规律；其次，根据异构信号噪声敏感先验和最大峭度变化趋势，构建双分解层，并通过能量波动模型监测在不同分解层下模态分量的能量变化，避免参数固定造成的过分解和欠分解问题，实现对惯导异构信号同步VMD分解；然后，根据皮尔逊相关系数 ...
doaj +1 more source
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
doaj
Scenarios and strategies for future‐proofing ecosystem management under climatic novelty
Conservation Biology, EarlyView.Abstract Climate change is driving unprecedented declines in dominant, habitat‐forming foundation species across marine and terrestrial ecosystems globally. As climatic novelty becomes the norm, ecosystem reassembly will become increasingly common. Predicting and understanding these transitions, and their implications for future ecosystem functioning ...
Lauren T. Toth +14 more
wiley +1 more source
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
doaj
A Review of UWB Radar Detection of Respiration and Heartbeat Signals in Different Scenarios [PDF]
Due to their many advantages, such as simple structure, low transmission power, strong penetration capability, high resolution, and high transmission speed, UWB (Ultra-WideBand) radars have been widely used for detecting life information in various ...
Bo ZHOU +6 more
core +1 more source
Conservation Biology, EarlyView.Abstract Knowledge of species distributions is essential for informing policies on nature conservation and restoration. However, updating them on a regular basis and doing so in a harmonized manner at the international level is difficult. The European Bird Census Council integrated national monitoring data covering 5 years to update farmland bird ...
Sergi Herrando +54 more
wiley +1 more source
基于逐次变分模态分解的飞轮-火电一次调频控制策略 [PDF]
全球能源互联网随着新型电力系统的大力建设与推广，火电机组面临的调频压力增大，提出一种逐次变分模态分解的飞轮-火电一次调频控制策略。首先，以飞轮储能和火电机组为研究对象，建立考虑新能源占比的飞轮-火电一次调频模型；其次，将一次调频功率指令利用逐次变分模态方法分解，由火电机组响应分解后的低频功率指令，同时设计飞轮储能下垂优化控制方法，实现飞轮储能与火电机组响应频率变化的协同控制；最后在不同工况下仿真验证，结果表明所提策略可有效避免火电机组一次调频时的频繁出力，减小火电机组响应频率变化时的调控要求 ...
张萍, 刘海涛
doaj +1 more source
Human breathing perception system based on Wi-Fi subcarrier mutual information [PDF]
The unpredictable environmental changes cause large fluctuations in Wi-Fi signals, and it is difficult to quantify the static and behaviorally-aware dynamic components in the subcarriers, so it is not possible to accurately portray the fluctuating form ...
Mengyuan HU, Ying LIU, Zhihong QIAN
core +1 more source