above threshold level 中文意思是什麼
above threshold level
解釋
閾上級-
This thesis studies the law of affecting de - noise result and the selection of the threshold and the wavelet function, the combination of wavelet and fft in the fault diagnosis of turbine - generator sets : by the de - noise anslysis of blocks and sin signals, concludes : to blocks signals, usually adopts soft threshold ; the law of affecting de - noise result is when use wavelet auto - de - noise, with the increasing of decomposed level, the de - noise result becomes worse while the level blow the 3, when the level above 3 and when uses wavelet packet, it is the other way round ; the best de - noise methods of the signal is that uses " dbl " wavelet function, three level, soft and " rigrsure " threshold
本文研究了分解層數對消噪結果影響的規律和閾值、小波函數的選取，結合小波分析與fft分析診斷汽輪發電機組的故障。通過對brocks和sin兩信號的分析，得出：對blocks信號進行分析一般採用軟閾值；分解層數對消噪結果影響的規律為用小波自動降噪在分解層數小於3時，隨著分解層數的增加，消噪結果變好，反之，則變差，用小波包降噪時隨著分解層數的增加，消噪效果變好；適宜選用dbl小波軟rigrsure閾值自動消噪。 -
Ti ? the voltage level at a transition - operated input that causes operation of the logic element according to specification, as the input voltage falls from a level above the positive - going threshold voltage, vt +
輸入電壓從正向門限電壓以上的電平vt ?開始下降，躍變后的輸入電平使得邏輯元素（單元）按照規范完成工作。 -
The amount of nickel released from the euro coins was up to 30 times above a level regarded by scientists as the concentration threshold for reactivity to a single exposure
實驗結果表明，當人們手拿這種硬幣時接觸到的鎳竟然比科學家實驗得出的能夠引起過敏反應的最低鎳濃度高出30倍。
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