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Argo floats revealing bimodality of large-scale mid-depth circulation in the North Atlantic 被引量:4
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作者 CHU Peter C IVANOV Leonid M +1 位作者 MELNICHENKO Oleg V LI Rongfeng 《Acta Oceanologica Sinica》 SCIE CAS CSCD 2008年第2期1-10,共10页
Analysis of Argo float trajectories at 1 000 m and temperature at 950 m in the North Atlantic between November 2003 and January 2005 demonstrates the existence of two different circulation modes with fast transition b... Analysis of Argo float trajectories at 1 000 m and temperature at 950 m in the North Atlantic between November 2003 and January 2005 demonstrates the existence of two different circulation modes with fast transition between them. Each mode has a pair of cyclonic - anticyclonic gyres. The difference is the location of the cyclonic gyre. The cyclonic gyre stretches from southeast to northwest in the first mode and from the southwest to the northeast in the second mode. The observed modes strongly affect the heat and salt transport in the North Atlantic. In particular, the second mode slows down the westward transport of the warm and saline water from the Mediterranean Sea. 展开更多
关键词 Argo trajectory data Atlantic Ocean biomodality mid-depth circulation optimal spectral decomposition
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基于最优分解的时不变小波变换的油液磨粒特征提取方法 被引量:1
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作者 彭娟 李川 《润滑与密封》 CAS CSCD 北大核心 2013年第9期54-59,共6页
分解层次的确定对磨粒特征的提取效果具有重要的影响。基于时不变小波变换,提出一种以残差信号的分段峭度均方差为准则的最优分解层次确定方法。该方法使用时不变小波变换方法提取磨粒信号,以提取出磨粒信号后的残差信号的分段峭度均方... 分解层次的确定对磨粒特征的提取效果具有重要的影响。基于时不变小波变换,提出一种以残差信号的分段峭度均方差为准则的最优分解层次确定方法。该方法使用时不变小波变换方法提取磨粒信号,以提取出磨粒信号后的残差信号的分段峭度均方差作为准则,根据残差信号的信息自适应地确定最佳分解层。分别使用仿真信号和真实信号对该方法进行验证,结果表明,该方法较传统方法可提高油液中磨粒检测精度。 展开更多
关键词 磨粒 时不变小波变换 最优分解层 残差信号
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