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The length of day series during the period of 1962.0—2000.0, the atmospheric angular momentum and the Southern Oscillation Index are adopted to analyze the relationships among the ENSO events that have occurred since 1960, the changes in the length of day and the atmospheric angular momentum. Attention is particularly given to the different effects of the 1982—1983 and 1997—1998 ENSO events on the variations of Earth rotation. The synthetic excitation effects of multi-scale atmospheric oscillations on the anomalous variations of the interannual rates of Earth rotation are revealed by means of the time-frequency spectrum of the wavelet transform. 相似文献
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静态随机访问存储器类型的FPGA在空间中易发生单粒子翻转的现象,会引起布线资源的错误,在地面主要采用故障注入方法进行模拟。现有注入方法不能准确地解决布线故障问题,通过对可编程互联点的解析,创新地提出了改变可编程互联点配置位状态来模拟单粒子翻转对布线资源影响的故障注入方法,并应用此方法对实际电路进行了故障注入测试,成功模拟了布线资源三种故障模式,证明了此注入方法的有效性。同时对造成故障的翻转位统计分析,结果表明开路为布线资源受单粒子翻转影响的主要故障。通过改变可编程互联点配置位状态来模拟单粒子翻转对布线资源影响的故障注入方法对评估布线算法的单粒子翻转容错能力有重要意义。 相似文献
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