prf 中文意思是什麼

prf 解釋
丙基氟,1-氟丙烷
  1. Prolactin releasing factor, prf

    催乳素釋放因子
  2. During helicopter slung - load flight, the main flight quality modes include : phugoid, dutch roll, longitude and latitude slung - load oscillation. according to the ads - 33e - prf specifications, the flight stability qualities had been evaluated

    直升機機外吊掛飛行過程中，體現飛行品質的運動模態主要為荷蘭滾模態、縱向浮沉振蕩模態，以及吊掛物橫向、縱向振蕩模態。
  3. The hydrogen permeation reduction factor ( prf ) evaluated in gas phase is 620 ~ 263 and in liquid pb - 17li phase is 45 ~ 30

    結果表明，實驗所得到的氫滲透率減低因子（ prf ）為：在氣相中， 620 263 ；在液態鉛鋰合金相中， 45 30 。
  4. They are the property of sum and difference beams, the errors of the elements and channels and different pulse repeating frequency ( prf )

    這些因素包括和、差波束的特性、陣元和通道的誤差、不同的脈沖重復頻率（ prf ） 。
  5. Radar altimeter is a kind of very important microwave sensing instrument for observing the earth, and there are a lot of key technologies involved in the high resolution spaceborne radar altimeter ( hrsbralt ). the principle of hrsbralt, the acquisition and track methods, the if simulation, the closed loop internal calibration method, the pulse repeat frequency ( prf ) design, and the ocean - land compatible altimeter design are studied in this dissertation

    雷達高度計是一種重要的微波遙感儀器，本文就高解析度星載雷達高度計的工作機理、跟蹤方法、大時帶積在軌閉環內校準以及海陸兼容等內容進行了深入的研究，具體包括以下八個方面的內容： （ 1 ）深入研究了星載雷達高度計的工作機理，並對典型雷達高度計系統進行了分析。
  6. At last, combining the characteristics of the missle - borne high - prf pulsed doppler radar, this paper analyzed the difficulties and the possible technique approach in detecting and recogniting moving target using missle - borne high - prf pulsed doppler radar

    最後，本文結合彈載高重頻脈沖多普勒體制雷達的特點，分析了彈載pd雷達對機動目標進行檢測、識別的難點及可採用的技術途徑。
  7. In chapter 3, this paper recommended the methods of estimating the parameter of moving target using cyclostationary and analyzed the performance of this method firstly, and put forward a recursive method for estimating the parameter ( velocity, acceleration ) of moving target combining the characteristic of high - prf pulsed doppler radar. then, based on the resolution of doppler and acceleration, combining the characteristic of the doppler spectrun and acceleration spectrum, this paper put forward a new method for differentiating muli - target

    然後，從彈載高重頻脈沖多普勒雷達的多普勒解析度和加速度解析度出發，結合不同編隊方式的多目標回波信號的特點，分析了多目標和單個目標的回波信號的多普勒譜和加速度譜的特性，提出了一種基於一維多普勒像和一維加速度像的級次多目標分辨演算法。
  8. Aiming at the restrictions of fft methods, this paper put forward a transform naming changing scale discrete chirp - fourier transform and applied it to detecting accelaration target using missle - borne high - prf pulsed doppler radar, at last this paper put forward a new sequential detection method. in the third part of this paper, aiming at the different characteristic of the extended target spectrum, this paper discussed the detecting and precised measuring the extended spectrum of the target

    針對傳統fft對加速目標進行積累檢測時的局限性，提出了一種變尺度離散chirp ? fourier變換並將其應用於彈載高重頻脈沖多普勒體制雷達對加速運動目標的檢測背景中，提出了一種對加速運動目標的序貫檢測演算法。
  9. The tritium permeation reduction factor ( prf ) of 316l with film evaluated at 500 ? is above a factor of 104, compared with 316l with pd film

    與表面鍍鈀膜的316l相比，氚滲透率減低因子（ prf ）值達到10 ~ 4以上。
  10. A new real time internal calibration scheme resolved this problem. the high prf can improve the measurement resolution on large ocean wave, and the topex altimeter imposes 4200hz for prf, but the reason has not been published

    （ 5 ）提出了大時帶積高精度雷達高度計星上實時內校準方案，保證大時帶積高度計可以實現在星上的閉環內校準工作。
  11. To the phenomena of prf - ambiguity, this paper discusses the method of prf - ambiguity resolving by wavelength diversity. simulation is made to analyze this algorithm

    對估計中會出現的模糊現象，討論了波長差異法解模糊，並進行了模擬。
  12. Synthesized signals with different pulse repetition frequencies ( prf ) and main vibration frequencies ( mvf ) were presented to the brown planthopper. the results showed that prf was a sensitive and important signal characteristic in mating choice. the prf and mvf sensitive ranges of male signals were 70 ~ 90hz, 200 ~ 1700hz separately, and of female signals were about 22hz, 100 ~ 300hz separately

    雄蟲敏感的prf范圍在22hz左右，雌蟲敏感的paf范圍為70 90hz ，這與實際的雌、雄蟲求偶鳴聲的pm變化范圍是一致的；雌、雄蟲能對mvf變化范圍較大的信號敏感，雄蟲敏感的mvf范圍為100 300hz ，與雌蟲求偶嗚聲的mvf變化范圍是一致的，而雌蟲敏感的mvf范圍為200 1700hz ，要比實際的雄蟲求偶鳴聲的mvf變化范圍大的多。
  13. It ' s was found that the bias voltage and rf power influence the quality of film and prf

    濺射時襯底偏壓和射頻功率可以影響膜的結構，從而影響prf值。
  14. Members should bring along one cheque, payment record form ( prf ), original membership card and entry forms

    會員須攜同一張支票、一份付款記錄表（ prf ）及會員證正本並連同所有報名表遞交。
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