time and frequency standards 中文意思是什麼

time and frequency standards 解釋
時間和頻率基準
  • time : n 1 時，時間，時日，歲月。2 時候，時刻；期間；時節，季節；〈常pl 〉時期，年代，時代； 〈the time ...
  • and : n. 1. 附加條件。2. 〈常 pl. 〉附加細節。
  • 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。
  • standards : 標準,規程
  1. Time and frequency standards

    時間和頻率基準
  2. If topic # 1 is not presented, this proposed seminar could include a brief overview of the fundamentals of time and frequency metrology and standards as in # 1, before focusing in more depth on practical metrology

    如果上一專題未宣講，應先做一個時間頻率計量學基礎的簡要介紹，然後才可以著眼與深入的實踐計量學。
  3. A more in - depth discussion of commercially available time and frequency measurement equipment and standards, and how such instrumentation can be used in the metrology laboratory

    市場上可用的時間頻率測量設備和標準的更深入的討論，以及此類儀器如何應用在計量實驗室。
  4. Overview of the different kinds of time and frequency standards and measurement services that are available, through nist, other nmis, and the private sector

    概述目前可用的美國nist 、各國國家計量院和私有的各種時間頻率標準、測量設備。
  5. Wavelet transform also has time - frequency orienting ability and realize the abruption of the balanced and unbalanced component in images. this paper, based on particularly expatiating information characters in sar image data, will investigate compression algorithm applying for sar images by analyzing embedded encoding algorithms using wavelet theory. using several standards to evaluate our method and spiht algorithm, it is clear that our method outgoes spiht algorithm

    本文在對sar圖像數據的信息特徵進行了詳細闡述的基礎上，利用小波理論分析近年來比較流行嵌入式壓縮編碼方法，來研究適用於sar圖像的壓縮方法，取得以下研究成果： （ 1 ）考慮到sar圖像的動態范圍比較大，而且sar圖像斑點噪聲模型大部分是乘性噪聲，先對其進行對數變換，既可以縮小數據的動態范圍，也可以把乘性噪聲轉變成加性噪聲模型。
  6. Description of some of the expected future developments in time and frequency standards and distribution, including such topics as chip - scale atomic clocks ( size of a rice grain, powered by aa battery, potentially capable of low cost mass production )

    介紹一些未來可預期的時間頻率標準和發布技術的進展，包括諸如「晶元級的原子鐘」 （大米粒尺寸，由aa電池供電，具有低成本大批量生產潛力） 。
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