very low frequency 中文意思是什麼

very low frequency 解釋
【電訊】甚低頻〈略 V. L. F. , v. 動詞 l. f. 〉。

  • very : adv 1 〈用於修飾形容詞、副詞或分詞〉很，甚，頗，極，非常。2 〈與否定詞結合〉（不）怎樣，（不）大...
  • low : adj 1 低的；淺的，矮的。 low flight 低飛。 a low temperature 低溫。 low tide [water] 低潮。 The g...
  • frequency : n. 1. 屢次，頻仍，頻繁。2. （脈搏等的）次數，出現率；頻度；【物理學】頻率，周率。
  1. The realization of quick acquest under very low snr and big frequency shift is one of the key problems of lpi radar. we designed a new receiver which needs less computation spend without any decline of the performance of the radar

    如何在較低輸入信噪比和較大頻偏的條件下實現擴頻碼快速捕獲是碼同步的難點，本文在不損失系統性能的基礎上，設計了一種結構簡單的接收機實現方案。
  2. Very little effort has been devoted to the experimental measurement of low frequency combustion response.

    在低頻燃燒響應的試驗測定方面只做了很少的工作。
  3. Very low frequency electromagnetical receiver

    甚低頻電磁儀
  4. Very low frequency radiation

    甚低頻輻射
  5. Very low frequency emission

    甚低頻發射
  6. Very low frequency antenna

    甚低頻天線
  7. Application of very low frequency electromagnetism method in indirectly ore exploration in the chaihulanzi gold deposit

    甚低頻電磁法在柴胡欄子金礦間接找礦中的應用
  8. In audio, a very low frequency oscillation often resulting from a positive feedback path in an amplifier system

    在音響設備中出現的振蕩頻率極低的低頻振蕩，常因放大系統的正反饋迴路引起。
  9. General technical specification of test instruments used for power equipments part 4 : very low frequency high voltage generator

    電力設備專用測試儀器通用技術條件.第4部分:超低頻高壓發生器
  10. This breed is also known for his ability to foretell storms and avalanches, perhaps because he may hear very low frequency sounds that are beyond our ability to hear

    這個品種有能力預測風暴和雪崩，可能是因它們能聽見非常低的頻率，甚至低於我們能力所能聽到的。
  11. The planet vibrates at a very low frequency ? too low for our ears to pick up, but enough that geologists get an annoying background noise on their sensitive instruments

    行星振動的頻率很低，我們耳朵很難分辨出，但在地理學家靈敏的儀器上卻會收到一個非常令人討厭的背景噪音。
  12. Since the target glint is essentially a very low frequency phenomenon whose bandwidth is typically equal to or less than that of the system, it is difficult for a missile to filter it out, or will cause the miss to increase

    由於目標閃爍的頻率通常小於或者與系統的頻帶相當，所以導彈無法濾掉此干擾信息，致使系統脫靶量增大。
  13. The low frequency is very clear and deep, high frequency sound can reach 20khz due to adopting high class materials and new technology

    電路採用高檔材料;高技術設計而成。低頻干凈而有彈性；高音纖細；全頻聲音圓滑。
  14. In view of this situation this article has conducted research to the design of metallurgy auxiliary biography with the frequency conversion table electrical machinery first multianalysis to the frequency changer and the frequency conversion table electrical machinery movement characteristic is carried out, the voltage waveform harmonious which the frequency changer outputs is big, attacks in a big way, and the voltage climbing rate reaches as high as 6600v / mu s which is 20 times ordinary sine alternating voltage, the rolling mill auxiliary biography table set the extremely strict request to the electrical machinery ; its movement frequency is very low, rate frequency in 8 - 20hz ; the velocity modulation scope is wide, the lowest movement frequency lowers to 1hz, and the starting number of times is quite frequently, each hour reaches as high as 600 - 800 time, the impact shoulders in a big way, the overload capacity request is high

    針對這一情況本文對冶金輔傳用變頻輥道電機的設計進行了系統研究。首先對變頻器和變頻輥道電機的運行特性進行詳細分析，變頻器輸出的電壓波形諧波大，沖擊大，電壓上升率高達6600v / s ，是普通正弦交流電壓的20倍;軋機輔傳輥道對電機提出了十分嚴格的要求:其運行頻率很低，額定頻率在8 - 20hz ;調速范圍寬，最低運行頻率低到0 . 5hz ，起動次數相當頻繁，每小時高達600 - 800次，沖擊負荷大，過載能力要求較高。
  15. In this system two oscillator are used for mixing. pll for high local oscillator and dds + pll for low local oscillator. by making full use of favourable narrow - band tracing filter character of pll and by combining the merits of dds such as super fine frequency resolution, high frequency accuracy, very fast frequency hoping with it, the pll / pll + dds frequency synthesizer presents wide band high quality source and super small frequency hoping step

    系統採用兩次混頻，其中高本振的設計採用pll鎖相環頻率合成來實現，充分發揮了鎖相環頻率合成器的優良特性，實現了系統所要求的高質量寬頻帶本振源；低本振採用pll + dds頻率合成來實現，結合pll優良的鎖相特性與dds的高頻率解析度、高頻率精確度等優點，實現了頻率的小步進高精度合成。
  16. Very - low frequency band

    甚低頻頻帶
  17. Very low sound frequency

    甚低音頻率
  18. This system employed a new concept for measuring upper winds, viz. use of vlf very low frequency in the range of 10 - 13 khz signals from a global navigational network, omega, for computing the wind

    與以往無線電相比，該系統在測風方面則採用了一種新的概念，利用世界性奧米茄導航站網的甚低頻信號10 - 13khz來計算出高空風向和風速，無需用雷達追蹤探空儀位置。
  19. Measurement of pressure, temperature and humidity operated in much the same principle as the older version of radiosonde, but computation of wind was made use of the vlf ( very low frequency in the range of 10 - 13 khz ) signals of a world - wide navigational network, omega

    該系統量度高空氣壓、氣溫及濕度的方法與舊式無線電探空儀大致相同，但在測風方面則採用了一種新的概念，利用世界性奧米茄導航站網的甚低頻信號（ 10 - 13khz ）來計算出高空風向和風速，無需用雷達追蹤探空儀位置。
  20. Scientists from universities in hawaii and florida say that they have taken videos of dolphins chasing schools of fish while emitting2 very low - frequency sounds

    夏威夷與佛羅里達高校的一些科學家表示，從他們已拍攝到海豚追捕魚群的錄像，並且發現海豚在捕食時發出較低頻率的聲音。
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