虛頻率 的英文怎麼說

中文拼音 [xūbīnlǜ]
虛頻率 英文
imaginary frequency
  • 虛 : Ⅰ名詞1 （空虛） void; emptiness 2 （政治思想等方面的道理） guiding principles; theory 3 （二十八...
  • 頻 : Ⅰ形容詞（次數多） frequent Ⅱ副詞（屢次） frequently; repeatedly Ⅲ名詞1 [物理學] （物體每秒鐘振動...
  • 率 : 率名詞（比值） rate; ratio; proportion
  • 頻率 : frequency; rate
  1. Design and achievement of multichannel frequency meter based on virtual instrument

    多通道虛擬頻率測量儀的設計與實現
  2. The key components in laser gyro is he - ne ring laser, and the reciprocal action theory between light and medium is the base in studying the ring laser, use the lamb half classical theory, and on the base of density matrix theory, the optical brounch equation was established, which described the movement of amplifying medium atom in the ring syntonic cavity, and according to the medium polarize theory the self consistent equations was deduced, which describe the light intensity and phasic of the counter - propagating wave. on the basis of this equations, adopted the simulation software matlab and virtual instrument programming language labwindows / cvi, we can do some simulated experiments in study the phenomenas such as amplify and dispersive characteristic of medium, mode pushing effection, burned hole effection and pattern competition, lock - in of frequency and the characteristic of light intensity and phasic of the counter - propagating wave in laser gyro

    激光陀螺的核心部件為he - ne環形激光器，而掌握光與介質的相互作用理論是研究激光器的關鍵，採用拉姆半經典理論為主，在密度矩陣理論的基礎上，推導環形諧振腔中描述he - ne氣體增益介質原子運動的光學布洛赫方程，運用介質極化理論得出描述激光陀螺反向行波的光強、位相所滿足的自洽場方程組，在此基礎上，運用matlab模擬軟體和虛擬儀器編程語言labwindows / cvi ，對激光陀螺中的介質增益色散特性、頻率牽引效應、燒孔效應及模競爭、閉鎖效應及環激光的光強和相位特性進行模擬試驗研究，並且運用全量子理論，對激光工作原理進行分析，得出二能級系統單模輻射場的光子數密度分佈，得出激光場的光子統計分佈，模擬激光場的動態建立過程。
  3. A digital automatic ultrasonic inspection system designation is introduced. this system was developed with pc computer and embedded dsp, combining computer software and hardware, ultrasonic nondestructive testing, digital signal processing, embedded rtos and visual instruments technology. it meet the requirements of automatic inspection such as high repetitively frequency and real time alertation

    該方案以pc機和dsp系統為核心構成主從機系統框架，以基於虛擬儀器思想的pc機應用程序和基於dsp的嵌入式實時操作系統構成雙重軟體結構，把傳統的超聲波無損檢測技術和先進的虛擬儀器技術、數字信號處理技術、嵌入式實時操作系統、計算機介面通信技術相結合，從而滿足了自動化探傷中1k / s的重復頻率和實時報警的要求。
  4. Design of virtual instruments based ultrasonic data acquistion system

    器件實現的虛擬電子儀器群中的高智能頻率計
  5. It has been shown that : the little indentation which represents the quantum noise of the system appears in the evolution curves ; the quantum noise which is caused by virtual photon field gradually becomes weak when w increases, the quantum noise increases when n increases ; the virtual photon process make the antibunching effect strengthen, make the squeezing degree deepen obviously, and lead to the additional vibration of entropy, the oscillation extent of the additional vibration of entropy increases when n increases and decreases when co or g increase. besides, the quantum dynamics of two coupling atoms interacting with a single mode ligh t field in a kerr medium is studied in this paper ; the influences of the kerr effect on the mean photon number, the degree of second order coherence of field, the evolution of the field entropy and the squeezing effect are also discussed

    ）的增大，量子噪聲分別減小和增大；虛光子過程使光場的反聚束效應增強，使光場的壓縮程度明顯加深，並引起了附加的「熵振蕩」 ，這種附加「熵振蕩」的幅度將隨著光場初始平均光子數（ ? ）的增加而增大，隨著光場頻率和原子間耦合系數g的增大而減小。本文還研究了充滿kerr介質腔中「耦合雙原子-單模光場」相互作用系統的量子動力學性質，研究了克爾效應對場的平均光子數、二階相干度、場熵演化特性及光場壓縮效應的影響。
  6. In video shot segmentation, an improvement to double - threold shot segmentation algorithm is provided, which uses multi - frame sampling technique and can improve the performance significantly on the detection of gradual transition. an abrupt transition detection algorithm is also developed on the basis of the closest pixels matching in spatio - temporal slice, which decreases the false rate and computing strength greatly

    在視頻鏡頭分割方面，提出了一種基於多幀抽樣的雙重比較鏡頭分割演算法，有效地提高了對視頻鏡頭漸變檢測的性能;同時，針對視頻鏡頭突變的檢測，提出了一種基於最近鄰像素匹配的時空切片鏡頭突變檢測演算法，該演算法顯著降低了突變檢測的虛檢率和計算量。
  7. Finally, in consideration of the characteristics of the differential balance mechanism, a more accurate virtual prototype of the mechanism is established and the simulation is carried out in the software environment of adams. the angular velocity curves of the relevant parts and the natural frequency of the mechanism are got. the results may be helpful to the improvement and the application of the mechanism

    最後，綜合考慮了輪齒嚙合剛度、搖臂軸扭轉柔性及齒輪傳動回差對差動平衡機構的影響，建立了能夠比較完整地反映該機構動態特性的虛擬樣機模型;在adams軟體環境下，對差動平衡機構的虛擬樣機模型進行了動態模擬，得出了能反映該機構動態特性的關系曲線，並確定了其固有頻率，為該機構的改進及其在月球車上的實際應用提供了參考依據。
  8. Under windows nt and labview development environment, using the linear fit module, exponential fit module > general polynomial fit module of labview to design a method for fitting the experiment data, the results of curve fitting indicate that the purpose of general polynomial fitting is better than the rest. separating the equivalent input impedance of magnetostrictive transducers without stimulate current from input impedance of it with stimulate loop based on the results of curve fitting, and determining the syntony frequency and electric simulation network parameters of magnetostrictive transducers by this input impedance. finally, with labview network functions, realizing magnetostrictive transducer electric simulation system based on web server and discussing a scheme for this system network by datasocket. the method of this paper can more accurately determine the syntony frequency and electric simulation network parameters of magnetostrictive transducers than the testing method of syntony & anti - syntony. at the same time, discussing virtual instrument measurement system and how to realize magnetostrictive transducer electric simulation network system by labview network functions of network virtual instrument measurement development environment

    在windowsnt系統環境和labview虛擬儀器技術開發平臺下，首次利用labview中的直線擬合模塊、指數擬合模塊以及多項式擬合模塊，設計了一種對實驗所得數據進行曲線擬合的方法，對三種擬合方法進行了比較，曲線擬合結果表明，多項式擬合方法相對于其它兩種擬合方法效果更好；根據曲線擬合的結果可從帶激勵線圈的磁致伸縮換能器的輸入阻抗中分離出磁致伸縮換能器鐵芯在無激勵電流時機械振動形成的等效輸入阻抗，並由此輸入阻抗確定了磁致伸縮換能器的諧振頻率及其電氣模擬網路參數；最後通過labview提供的網路功能，實現了基於web服務器的磁致伸縮換能器電氣模擬虛擬儀器測試系統，並探討了通過datasocket技術實現該系統網路化的方案。
  9. The control tactics of space voltage vector are investigated, and the simplified algorithm which judges the sector location of reference vector and calculates switch operation time is put forward. by analyzing the current hysteresis control, the relation between switch frequency, and hysteresis bandwidth and input inductance of pwm rectifier is deduced. by applying instantaneous power theory, the principle of pwm rectifier power control is analyzed, and the direct power control by matlab toolbox through estimating active power and reactive power with virtual flux is realized, and the simulation results prove that it is correct

    對常用空間電壓矢量控制策略進行分析，提出了給定參考矢量所在區間判斷的簡化方法，以及電壓矢量作用時間的求取方法；分析了電流滯環控制策略，推導出開關頻率與滯環帶寬以及整流器輸入電感之間的關系；應用瞬時功率理論分析pwm整流器功率控制原理，通過虛擬磁鏈估計有功功率和無功功率，用matlab實現了直接功率控制，並驗證了該控制方法的正確性。
  10. The real part of the complex impedance decreases with frequency ; the imaginary part of the complex impedance increases with frequency to the maximum, and then decreases with frequency ; and phase angle decreases with frequency increasing

    結果發現輝長巖復阻抗的實部隨頻率的增加而減小，而虛部隨頻率增加先增大后減小；相角隨頻率增加而減小。
  11. Data processing software is designed for tbs - 2000 strain measuring system in the classical virtual instruments engineering workbench ; it is applied to process the data which are acquired in the way of dynamic stress analysis, statistic stress analysis and proper frequency analysis

    利用虛擬儀器的典型開發平臺labview針對tbs ? 2000應變測試系統開發了數據處理軟體；利用該數據處理軟體對測試所得的數據進行了動、靜應力分析和固有頻率分析。
  12. On the basis of exploring and studying virtual manufacturing technology systemically, the virtual manufacturing of hspc has been realized. it successfully resolves a series of technical difficulties caused by increasing photograph frequency of hspc

    論文在對虛擬製造技術作了較系統的探索和研究的基礎上，實現了高速攝影機的虛擬製造，成功地解決了高速攝影機面臨的提高攝影頻率帶來的一系列技術難題。
  13. In this thesis, first, we present the theory of sess system, the generation of the sess spreading code and its characteristics and the acquisition theory of conventional spread spectrum communication system. an efficient acquisition scheme based on periodically transmitting the synchronization head, which is composed of binary chaotic codes, using the matched filter and automatic decision threshold - level control based on a so - called constant false alarm criterion for sess system is present. the acquisition model of sess system is built and simulated in the awgn channel, the raleigh fading channel and imulti - address interfere condition

    本文首先概述了自編碼擴頻通信的原理、自編碼擴頻序列的產生方法及其特性和擴頻通信系統編碼同步的理論，然後針對自編碼擴頻通信系統提出了擴頻序列捕獲方案:周期性地加入混沌序列同步碼，並採用恆虛警率匹配濾波器捕獲法;在加性白高斯噪聲通道、瑞利衰落通道和多址干擾情況下進行了模擬，分析了各種捕獲性能:在選擇性能最優的混沌序列、適當的序列長度、虛警概率及門限值的情況下，可以獲得較短的捕獲時間和較大的捕獲概率。
  14. The performance of vibration and movement of seedlings is validated in the whole vibration plate simulation. an orthogonal experiment is designed for analyzing the effect that the four parameters ( f, co, a, k ) act on horizontal and vertical velocity of seedlings

    首先驗證虛擬模型的振動性能與物理原型基本相符，進一步採用正交試驗，考察四個因子（激振頻率山、激振力幅值f 、彈簧剛度k及彈簧傾角）對缽苗推送速度的影響。
  15. Then one remote supervision system based on virtual instrument technology is studied and realized. the system can measure parameters such as signal level, carrier frequency and snr of remote channel, and can estimate the state of remote channel based on this parameters, and can display the time - domain and frequency - domain wave real time of remote channel, too

    針對目前遠動監控方案的不足，研究並實現了基於虛擬儀器技術的電力遠動通道監控系統，該系統可以對遠動收發信電平、載波頻率和信噪比三個通道參數進行測量，具有實時時域波形和功率譜波形顯示功能，並能根據通道參數對通道狀態進行綜合判斷。
  16. A comprehensive theory is presented for fm spectroscopy of doppler - broadened molecular iodine absorption lines. the relationship betwcen fm spectroscopy and modulation frequency and modulation index has been studied. the whole circuit for thc frcquency stabilized laser system has been developed

    建立了多普勒加寬碘分子線性吸收fm光譜的一般理論，對fm光譜與調制頻率和調制度的關系進行了研究；並研製了532nmnd : yvo _ 4 / ktp碘吸收穩頻激光器的電路系統；提出了虛擬激光穩頻技術的概念。
  17. The virtual cathode oscillator ( vircator ) is one of the most important devices that can produce high power microwaves. for the increasing of microwave power and the locking of operation frequency, researchers have proposed many different types of improved vircators

    軸向反饋式虛陰極振蕩器主要利用反饋微波調制電子束和虛陰極，從而增大微波輸出功率、提高效率、穩定頻率、凈化模式。
  18. Next, the effects of the electron - beam quality on the characteristics of the vircator are investigated with simulation method. the simulation results show that the front edge of the beam pulse has almost no effect on the saturated microwave output, while good front edges can accelerate the saturation of the virtual cathode oscillation, and beam quality ( except its energy spread ) has almost no effect on microwave frequency, and so on

    結果表明：上凸形束脈沖前沿可使虛陰極振蕩器達到飽和振蕩的時間縮短但對微波飽和功率基本無影響；束流脈寬應足夠大，否則虛陰極振蕩器不能達到飽和振蕩（對應本文中的模型，束脈寬應大於16ns ） ；能散度的影響不可忽視，當能散度為5時，束波轉換效率從單能束時的3 . 8降至1 . 5 ；束流質量（除能散度外）對微波頻率基本上沒有影響等。
  19. An effect that occurs when a signal is sampled at a rate less than twice the highest frequency present in the signal. the subsequent signal recovered from the samples will not contain the high frequency component of the original signal and will display a false low frequency signal

    以低於信號中最高頻率兩倍的頻率進行信號取樣時出現的一種效應，即當由取樣狀態還原時，還原后的信號將不再含有原來信號中的高頻成分，並將顯示出虛假的低頻信號。
  20. It combines the real echoes with the date simulated using the real airborne sar system parameters to analyze and validate the method. after the combined data are filtered, the improved greatest of cell - average constant - false - alarm - rate ( go - ca - cfar ) is used to judge whether moving target is detected or not. in the following, real moving target is detected and its velocity and position is gained through which it is focused well

    將接收的實際場景數據與實際系統參數下模擬的典型數據相結合，分析、驗證了頻域濾波法的性能，並對濾波后的數據採用改進的選大單元平均恆虛警率（ go - ca - cfar ）方法進行處理，判斷動目標是否存在；然後對實際的動目標進行檢測，準確的估計出目標速度及位置並對目標重新聚焦成像，接下來將聚焦的動目標圖像和常規sar圖像迭加，同時得到了回到真實位置的動目標聚焦圖像和實際場景sar圖像。
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