Results 11 to 20 of about 906,067 (166)

基于Gammatone滤波器组的齿轮系统侧隙诱发冲击特征提取

Jixie chuandong, 2015
齿侧间隙会引发齿间啮合冲击,影响齿轮传动的平稳性和可靠性。为了对故障冲击成分进行提取,提出了基于Gammatone滤波器组的特征提取方法。该方法借鉴听觉系统复杂语音信号识别过程中耳蜗基底膜的信号处理思想,采用与基底膜冲击响应、幅频特性相似的Gammatone滤波器组模型对齿轮系统故障信号进行时频分析,进而提取冲击特征。研究结果表明:Gammatone滤波器组具有对齿轮系统的非平稳瞬变振动信号进行时频分析的功能,该方法能够有效提取由于齿侧间隙引起的啮合冲击故障特征。
高洪波, 李允公, 于良会, 刘杰
doaj   +4 more sources

事件诱发电位信号分类的时空特征提取方法 [PDF]

, 2011
准确对事件诱发电位(ERPs)进行分类，对于各种人类认知研究和临床医学评估非常有意义．由于ERPs 信号是非常高维的数据，而且其中包含非常多的与分类无关的信息，从ERPs 信号中提取特征尤显重要．分析了共空间模式(CSP)的原理和不足，引入自回归(AR)模型与白化变换相结合，提出了针对ERPs 分类的时空特征提取方法，并设计了验证该方法的认知实 验，在认知实验数据上分别用时空特征提取方法与CSP 提取特征，用同样的分类器支持向量机(SVM)训练分类器，比较它们的分类效果．实验表明，在ERPs分类问题上，
李明泓, 黄志华, 马原野, 周昌乐   +3 more
core   +1 more source

Conservative roots confer a larger microbial carbon pump efficacy than acquisitive roots by regulating microbial life‐history strategy

Functional Ecology, EarlyView.
Read the free Plain Language Summary for this article on the Journal blog. Abstract Root activity creates unique microbial hotspots in the rhizosphere by influencing the metabolic activities of surrounding soil microorganisms, profoundly regulating the dynamics of soil organic carbon (SOC). However, how root economic strategies affect the formation and
Qiyu Tan, Peipei Zhang, Na Li, Guangru Wang, Wenbo Pang, Huangxin Zhang, Mingzhou Zhang, Qitong Wang, Huajun Yin   +8 more
wiley   +1 more source

Alleviation of phosphorus rather than nitrogen limitation driven by permafrost and landscape effects on Dahurian larch forests

Functional Ecology, EarlyView.
Read the free Plain Language Summary for this article on the Journal blog. Abstract Permafrost thaw is reshaping nutrient dynamics in boreal forests, but its impacts on tree nutrient limitation and functional strategies remain poorly understood. Clarifying these responses is crucial for predicting the response of boreal forests to climate change.
Qiyue Fu, Liang Shi, Zhaopeng Song, Boyi Liang, Honglin He, Kun Yang, Weihua Zhang, Lisha Lyu, Anatoly S. Prokushkin, Hongyan Liu   +9 more
wiley   +1 more source

Constructed value of information with iterative scoring and parametric uncertainty to identify management‐relevant research priorities for a declining raptor species

Conservation Biology, EarlyView.
Abstract Constructed value of information (CVoI) is an expert elicitation decision‐analytic tool used to prioritize sources of uncertainty based on their potential to improve decision outcomes if resolved. Despite increased application of CVoI, the robustness of CVoI prioritization of sources of uncertainty relative to differences in expert elicitation
Kristin P. Davis, Mitchell J. Eaton, Emily R. Bjerre, Hillary M. White, Clint W. Boal, Jennifer H. Herner‐Thogmartin, Orin J. Robinson, Abigail J. Lawson   +7 more
wiley   +1 more source

Institutional lessons from the Nordic management model

Conservation Biology, EarlyView.
Abstract To improve wildlife management outcomes, in terms of reaching management goals and increasing legitimacy, Nordic countries have developed institutional systems involving stakeholders that aim for a more inclusive and participatory model.
Jens Nilsson, Annica Sandström, Camilla Sandström   +2 more
wiley   +1 more source

Integrating fossil data in ecological niche models to improve predictions of future habitat of Caribbean corals

Conservation Biology, EarlyView.
Abstract Ecological niche models (ENMs) are used to assess the abiotic preferences of species by linking their occurrences to the environmental conditions in which they live. We developed a fossil‐informed ENM framework that integrates mid‐Holocene and modern occurrences to test niche stability and reconstruct abiotic niche characteristics for four ...
Claire. M. Williams, Fernando Machado‐Stredel, Rowan C. Martindale, Corinne E. Myers   +3 more
wiley   +1 more source

The Emotional Valence Paradox in Social media: A Computational Linguistic Analysis of How Sentiment, Emotion, and Content Domain Predict Social Comparisons on Rednote

International Journal of Applied Linguistics, EarlyView.
ABSTRACT This computational linguistic study analyzes 8743 Rednote posts to examine how sentiment, emotion, and content domain collectively shape social comparison dynamics on social media. We identify four key findings: (1) an emotional gradient, where upward comparison content exhibits the highest sentiment scores and downward comparison the lowest; (
Michelle Mingyue Gu, Shuting Zhang, Yue Zhang, Hua Zhao, Jiapei Gu, Jincheng Ding, Xiaofei Lu, Chetwyn Che‐hin Chan   +7 more
wiley   +1 more source

Synthesizing Empirical Research on Learner Metacognition in Second Language Writing

International Journal of Applied Linguistics, EarlyView.
ABSTRACT Despite considerable research interest in learner metacognition in second language (L2) writing, there is not yet a review that synthesizes the existing empirical findings and discusses their implications. To fill the void, this systematic review synthesized 39 empirical studies on learner metacognition in L2 writing and examined their salient
Chen Li, Icy Lee, Zhicheng Mao
wiley   +1 more source

Intelligent Material Framework for Data Mining and Performance Prediction of Invar Alloy

Rare Metals, Volume 45, Issue 6, June 2026.
ABSTRACT Invar alloys exhibit a low coefficient of thermal expansion (CTE) over a wide temperature range and are regarded as critical materials for precision engineering and aerospace applications. In this work, an integrated OLR‐IMF (an intelligent material framework based on optical character recognition [OCR], large language models [LLMs], and ...
Tongbo Jiang, Chunlei Shang, Hong‐Hui Wu, Mingshuo Nie, Dexin Zhu, Fan Yang, Haoliang Wang, Shuize Wang, Junheng Gao, Haitao Zhao, Chaolei Zhang, Xinping Mao   +11 more
wiley   +1 more source