frequency field 中文意思是什麼

frequency field 解釋
頻率域
  • 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。
  • field : n 菲爾德〈姓氏〉。n 1 原野，曠野；（海、空、冰雪等的）茫茫一片。2 田地，牧場；割草場；〈pl 〉〈集...
  1. Through the inspecting, the author selected three methods of eradiate noise ' s feature extraction. the methods include the pedigree, e - filter, fractal. in those methods, the pedigree is based on frequency field, the e - filter is based on the energy field and the fractal is based on time field

    本文作者經過考察，採用了三種前期研究中較為有效的水下目標特徵提取方法? ?基於功率譜估計的線譜特徵提取方法、基於小波分析的不同頻段內能量特徵提取方法和基於水聲信號分維特性的特徵提取方法。
  2. By its multi - solution idea, we can focalize discretionary detail of detection of cable - stayed bridge and process in time field and frequency field

    利用小波分析的多解析度分析思想，可以聚焦到信號的任意細節進行時頻域處理，適合斜拉橋振動狀態的監測。
  3. 4. the signal data collected in expteriment are taken out in emulational research of system experiment. many methods such as adding window in frequency field, eliminating static object and so on restrain the width and sidelobe of static mussy weaves and detect out the target availably

    4 、在系統實驗模擬研究中調出實驗採集信號數據，使用頻域加窗不加窗、清除靜態目標等方法很好地控制了靜態雜波干擾的幅度及旁瓣，有效地檢測出了目標。
  4. A doctor can find different spectrum distribution at each time segment, and can also look over frequency field corresponding time domain information

    醫生可以查找任一時段的不同譜峰分佈，也可以查看任一頻段對應的時域情況。
  5. Based on the principle of the ultrasonic cross - correlation flowmeter, the key factor of the development of cross - correlation flowmeter, namely the design of cross - correlator, is analyzed in the paper. digital signal processing is introduced to design the flowmeter, the cross - correlation operation of random noise signal is dealt with inside the frequency field, and the digital cross - correlator is designed

    本文從超聲相關流量計的工作原理出發，分析了超聲相關流量計研製的關鍵因素，即相關器的設計，並將數字信號處理技術引入了超聲相關流量計的設計，在頻域內對流動隨機噪聲信號進行相關處理，構造了數字相關器。
  6. A sort of spot dynamic balance test system is developed using singlechip as a core apparatus. it can do single - face and double - face dynamic balance test, present result of unequilibrium and its phase position, can test rotate speed and vibration, can show the time - field and frequency - field picture of gain signal

    本課題是利用單片機作為核心器件研製的一套可應用於現場的動平衡測試系統。該系統能完成現場動平衡單面或雙面測試，實時給出不平衡量的大小和相位。也可單獨測轉速和振動，還能對採集到的振動信號作時域、頻域圖顯示。
  7. In this time, as a result of major development in computer technologies and fast fourier transform wider application, many frequency analyzer based on digital signal processing theory and multi - function signal analysis software occurred. which greatly strengthened analysis function to engineer vibration signal ' s time field and frequency field

    在這一時期，由於計算機的快速發展以及快速傅立葉變換的普遍應用，各種基於數字信號處理原理的頻率分析儀以及多功能信號分析軟體出現，從而大大加強了對工程振動信號的時域及頻域分析功能。
  8. Fuzhon jingmei biotechnology dvelopany limited since its establishent has become the main instrument of the high potential for r & d, production, marketing, iresearch and developent of high - potential therapeneutic apparatus for one set ; including electrostatic field, the negative electric field, the low - frequency field, high frequency anions, such as far - infrared

    福州靜美生物技術開發有限公司自成立以來主要自立於高電位健康器的研發、生產及銷售，我公司研發的高電位健康器集多種功能為一體；包括有靜電場、負電場、低頻場、高周波、負離子、遠紅外等。
  9. The radial high current forms the virtual cathode in the reflected high frequency field, which further modulates the emitted electron beam

    徑向強流電子束在徑向反射場中會形成虛陰極振蕩，單獨的虛陰極振蕩產生的微波效率低。
  10. The pollution of extremely low frequency field in great power plants and distribution of electric field in transmission line with different voltage grade

    電力設備及高壓架空線路周圍工頻磁場的探討
  11. Under the cylindrical coordinate, the transit - time effect of the radial gap in the resonance cavity of rtto is studied by hydrodynamic theory. the equation describing the interaction between the electron beam and the high frequency field is obtained

    在柱坐標系統中，我們用流體理論方法分析了rtto諧振腔間隙的渡越時間效應，得到了在有限渡越角情況下電子束與高頻場相互作用的方程。
  12. The temporal, spatial and frequency - field characteristics are discussed. the validity of the corresponding empiric formula is analyzed and the atmospheric effects and correction method are investigated in the data analysis of the ground - based observations. the atmospheric effects on the gravity observations are analyzed and detected using the gravity data recorded with the superconducting gravimeters at the global geodynamic project ( ggp ) stations

    利用實測地面氣溫、氣壓資料獲得大氣負荷效應時間序列的數值結果，研究大氣影響的時間、空間和頻率特徵，分析經驗公式的有效性，研究地面觀測和數據分析大氣影響和改正的方案；利用ggp臺站超導重力觀測資料，分析檢驗大氣重力影響；分析igs臺站大氣位移改正的可能性
  13. By simulating mathematically on frequency and on space, we can find the average speed of space field and the average speed of frequency field that is weighted by amplitude, and analyse their relation, and analyse the meaning of space speed variance x and frequency speed variance v. in the fourth part, how to ensure the height of cloud is introduced, and basing on the theory of wind field continuity, the height updating quality controlling is introduced. in the fifth part, the system of cloud wind is introduced, we tracked cloud - motion of consecutive satellite images with one - minute interval by the 1 - d fourier analysis technique and the two - dim fourier analysis technique and the fft analysis technique, and dispose them with quality controlling. in the sixth part, we summarized our research and put up with shortages of this article

    模擬模塊內各點的速度線性變化時，得到空間域平均速度以及頻率域以振幅為權重的平均速度，分析了空間域平均速度和頻率域以振幅為權重的平均速度的關系，並揭示空間域的平均速度的標準差_ x和頻率域的振幅為權重的平均速度的標準差_ v的意義，以及它們之間的關系；第四章介紹了雲跡風系統的高度指定以及風矢高度的劃分，並根據風場連續性原理，介紹了高度調整法的質量控制；第五章介紹導風系統的流程，選擇了三個時刻的ir雲圖，分別用一維傅立葉相位法、二維傅立葉相位法和快速傅立葉演算法計算一個風場個例，並對所得風場進行質量控制，並給出風場圖；第六章進行研究總結，指出不足和有待于進一步研究之處。
  14. Occupational exposure limit for high frequency field in the work environment

    作業場所高頻電磁場職業接觸限值
  15. Awg possesses an essential function of coherence system - " composing frequency and generating image ". therefore as far as spatial frequency field is concerned, awg is an optical integration of coherent system : two slab waveguides similar to two fourier lenses of one dimension and twice fourier transform of optical signals are realized. here the arrayed waveguide region is frequency spectrum region

    Awg具有相干系統的「分頻成譜、合頻成像」這一本質功能，因此若從空間頻域的角度來看， awg就是一個相干系統的光學集成：兩個平板波導類似兩個一維傅里葉透鏡，實現光信號的兩次傅里葉變換；而陣列波導區即為頻譜區。
  16. We have studied pretreatment of fingerprint images with experiments, including all the algorithm implementations of the normalization of fingerprint image, estimation of orientation and frequency field, fingerprint image enhancement, extraction of fingerprint ridges, and thinning of fingerprint ridges. the result can be accepted

    本文對指紋預處理進行了實驗研究，編程實現了指紋圖像歸一化，指紋圖像方向場的計算，頻率的計算，指紋圖像的濾波增強，指紋圖像的紋線提取（二值化） ，紋線細化。
  17. 2. from the finite element theory and finite integral ’ s aspect, analyzed the structure of the high frequency field inside the ellipsoidal cavity with arithmetic simulation that carried through in computers

    2 .從有限元理論和有限積分的角度出發，用計算機數值模擬對橢球諧振腔內的高頻場結構進行分析。
  18. After analyzing the theory of mtdi and setting up the model of moving target echoes, the dissertation discusses in detail the effect of moving target doppler center frequency and doppler rate on the conventional sar image. it also analyzes detailedly the range migration of moving target from time field and frequency field and provides migration model in both fields. after that, it divides algorithms of mtdi into several classes, analyzes the influence of signal - to - noise on the detection results and gives the flow chart of moving target imaging processing

    本文的主要貢獻包括： 1 、建立了運動目標回波散射模型，深入探討了進行常規sar成像時，動目標的多普勒中心頻率和調頻率對動目標圖像造成的影響；從時域和頻域兩方面詳細分析了由於目標運動造成的距離徙動效應，建立了距離徙動模型；然後研究了動目標檢測原理，並對現有的檢測方法進行分類，使之更加系統化；詳細分析了動目標信噪比對檢測結果的影響，給出了sar系統動目標成像流程圖，指出了動目標成像中的關鍵環節。
  19. Abstract : the track vertical profile irregularity is regarded as stationary ergodic gaussian random processes. the vertical radom vibration of vehicle and track is computed on the basis of vehicle track coupling dynamic fem model. the analysis of system response is made in the time and frequency field

    文摘:將軌道高低不平順視為平穩各態歷經隨機過程5 ，利用車輛-軌道耦合動力有限元計算模型，對車輛-軌道系統垂向隨機振動做了計算，在時域和頻域內對系統響應作了分析。
  20. Were much needed an a / d testing theory in frequency - field on the lain of digital signal processing was given

    在總結已有高速模數轉換器件性能測試方法的基礎上給出一套基於頻域數字信號處理理論的高速模數轉換電路工程應用的有效評估方法。
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