譜帶寬度 的英文怎麼說

中文拼音 [dàikuān]
譜帶寬度 英文
effective bandwidth
  • : Ⅰ名詞[書面語]1 (按類別或系統編成的書或冊子等) table; chart; register 2 (指導練習的格式或圖形)...
  • : 度動詞[書面語] (推測; 估計) surmise; estimate
  1. Filter is used to transmit spectrum of definitive broadband in the continuous spectrum or to extract certain radiation in the line spectra

    光學濾光片在連續的光中用於透過一定的光或在線狀光中提取某些輻射。
  2. Base on two - stage approach, we adjust experimental parameter to develop a new method ( three - stage approach ) to prepare c - bn thin films. the study proves that it is favorable to prepare bn thin films of high cubic phase content. depositing time and substrate bias voltage in the first stage are 5 min and - 180v respectively

    根據si片上bn薄膜的反射光r ( )和熔融石英片上bn薄膜的反射光r ( )和透射光t ( )各自獨立的計算了bn薄膜的光學隙,利用兩種方法分別計算立方相含量均約為55 %的bn薄膜的禁為5 . 38ev和5 . 4ev ,其結果均和由經驗公式計算得到的結果非常接近。
  3. In the terms of interpolation, the image reconstructed from nearest interpolation or linear interpolation has good edge but serious noise ; reconstruction from 4 * 4cubic interpolation or three b - spline or three - order lagrange interpolations has better local character. 2 x 2cubic interpolations which has both better edge and local character is the ideal interpolation, the following is the basic principle during reconstruction : ( 1 ) the more width of interpolation, the more number of summation and the more order of interpolation polynomial, the higher of density resolution ; ( 2 ) the more of interpolation polynomial and width of interpolation, the more of reconstruction time simultaneously, aimed at eliminating the effects of noise contained in projection data, in this paper, author analysis cause and effects of common artifacts. importantly, discusses convolution back - projection reconstruction algorithm with a shift axis of rotation has been derived for correcting images that acquired with a divergence axis of rotation using the fan beam geometry with an angle - equaled detector

    在ct圖像重建時,選擇有限窗有較好的空間解析,三角形窗有較好的密解析,選擇餘弦窗則使得空間解析與密解析的折衷;從窗函數的頻來講,可以用於圖像重建的一個良好的卷積窗函數應該具備以下條件: ( ? )小的3dbb ,即最小的主瓣; ( ? )最小的旁瓣最大峰值a ; ( ? )最大的旁瓣峰值衰減速d ;就內插函數而言,臨近點內插與線性內插重建圖像噪聲大,但有較好的邊緣與細節; 4 4三次內插、三次b -樣條與四次拉格朗日多項式內插圖像平滑,局部特性較好。
  4. When the - 3 - particle size was small, the aberration of crystal lattice appeared and the bandgap energy increased, which resulted in the blue shift of absorption in the spectrum

    本研究中小的二氧化鈦晶粒導致了tio _ 2的晶格畸變,進而增大了tio _ 2的禁,表現在光吸收的藍移。
  5. The spectral calibration of the small spectrometer has been completed and resolution, wavelength precision and bandwidth of it are all determined

    進行相關的光測量實驗,完成了光儀的光標定及解析、波長精等性能指標的測定。
  6. More recent studies show nanowires products with narrow dismeter distribution around 5 - 10mn and lengths ranging from several hundred nanometers to several micrometers can be obtained if the mixture solution of naoh and koh was replaced by koh solution. the nanowires were analyzed by a range of methods including powder x - ray diffraction ( xrd ), high resolution electron microscopy ( hrem ), selected area electron diffraction ( saed ), electron energy loss spectroscopy ( eels ), xrd and hrem image simulations. the structure of nanowires is determinded to be of the type of k2ti6oi3

    利用x射線衍射( xri ) ) 、高分辨電子顯微鏡( hrtem ) 、選區電子衍射( saed ) 、電子能量損失( eels )以及x射線衍射和高分辨像模擬等分析測試手段,初步分析了這種納米線的生長機理,探討了她的結構和光學性能,實驗結果顯示這種納米線具有kzti6o ; 3的結構,紫外一可見光吸收光顯示, kzti6ol3納米線禁約為3 . 45ev 。
  7. Thus, the frequency domain adaptive filter is well suited to a multi - narrowband interference scenario, the paper studied frequency domain adaptive algorithms, carried out analysis and computer simulations. simulation results : for gold codes ds - ss signal of length 63, 4 interferences of signal to interference ratio ( sir ) 40 ub or 4 narrowband interferences of signal to interference ratio ( sir ) 40 db and frequency - spectrum bandwidth 12 percent of the whole bandwidth, the sir improvement is better than 20db

    模擬結果指出,在輸入信號為干擾是4個等強的多音干擾或4個頻占信號總12的強窄干擾(干信比為40db )的擴頻信號(碼長為63的gold碼序列)情況下,演算法的干擾抑制比均優於20db 。
  8. None but is the test spectrum abundant and controllable, it is possible to simulate the stresses environment needed for exposing weakness of the product. based on summarizing the present status of the vibration test and vibration environment simulation technology in the world, the topic of simulation of super - gaussian random vibration environment with controllable frequency spectrum and its applications in reliability enhancement testing is put forward. the main content and conclusions of the dissertation are as following : 1

    本文在綜述國內外振動試驗技術和振動環境模擬技術的基礎上,引出「頻可控的超高斯隨機振動環境模擬技術及其在可靠性強化試驗中的應用」這一主題,並緊緊圍繞該主題開展了如下研究工作: 1 .全面分析了振動激勵的功率量級、幅值分佈、以及試件結構的固有頻率、阻尼比等因素對疲勞損傷累積的強化效應,提出振動強化試驗激勵信號應具備的重要特性:頻可控和超高斯,確立了本文的研究主題和方向。
  9. Standard test method for wavelength accuracy of spectral bandwidth fluorescence spectrometers

    熒光分光計的波長精密的標準試驗方法
  10. According to the current problems such as low quantum efficiency. limited available sun energy spectrum range, and inefficient recovery, resulted from the practical using of photocatalysis, using the narrowband semiconductor cds ( eg = 2. 5ev ) to compound with tio2 seems to be an effective solution. since it will not only enlarge the region of the absorption with the proper narrow band of cds but also improve the photodegradation efficiency on account of the band overlap of the two, which makes the photo induced electron and holes separate more easily

    本文針對光催化技術應用中存在的tio _ 2光催化量子效率低,吸收利用太陽能光范圍有限,催化劑回收困難等問題,通過窄禁半導體cds ( e = 2 . 5ev )的復合,對納米tio _ 2進行了改性研究,一方面,由於cds的窄禁可以擴展薄膜的光吸收范圍,另一方面,由於能的交疊,提高了光生電子和空穴的分離效率,從而提高了薄膜的光催化降解效率。
  11. Using the couple mode theory, the reflection spectrum, the peak reflectivity and the reflection bandwidth of several typical fiber grating filters have been theoretically analyzed and numerically simulated

    數值模擬了它們的反射分佈、峰值反射率以及反射隨光纖光柵的長和光柵折射率的調制深的變化關系。
  12. At last we introduce the realization of all the parts, the problem in the circuit design and the measured data. the results show that the designed system has met the requirement. in this dissertation, direct digital synthesis technology has been used in the phase - locked frequency synthesizer, which can make full use of the characteristics of direct digital synthesis technology such as flexible output wave shape and continuous

    本課題將直接數字式合成技術用於鎖相頻率合成器中,該方法將直接數字合成的特點,如輸出波形靈活且相位連續、頻率穩定高、輸出頻率解析高、頻率轉換速快、輸出相位噪聲低、集成高、功耗低、體積小等與鎖相環路的頻、工作頻率高、頻質量好等優點有機的結合起來,從而在的條件下實現了比較好的雜散性能和相噪。
  13. Standard practice for measuring practical spectral bandwidth of ultraviolet - visible spectrophotometers

    紫外線-可見分光光計的實用光的測量
  14. By comparable investigation, two luminescence mechanisms can explain the different variety of pl intensity of origin and annealed samples and are dominant mechanisms separately in unanneal and anneal course

    經過退火處理后,在相同波長的光激發下發光強逐漸增強,峰型逐漸變好,發光的半峰也變窄。
  15. The wavelet transform is discussed in the code - width estimation ; and the feasibility and effectiveness of the code - width estimation using the spectrum of the bipolar base - band signal are proved

    在參數估計中,主要討論了小波變換演算法在基信號碼元估計中的應用以及利用雙極性基信號的頻估計碼元的可行性和有效性。
  16. When estimating frequency with the fft, the resolution and accuracy are limited by the observation time of the signal, i. e., a / = it. the level measurement accuracy of the fmcw radar is determined by the bandwidth of the transmitted signal

    掃頻1 . 5ghz , fft兩條線的間隔對應的距離為10cm ,而液位測量系統的精要求達到1mm ,因此直接利用fft頻估計距離顯然無法達到精要求。
  17. The turns in the serpentine channel were asymmetrically tapered to minimize geometrical contributions to band broadening and to provide ample channel length for high - efficiency chromatographic separations

    蜿蜒通道地轉彎處是不均勻地錐形以減小幾何原因引起地和提供樣品通道長使高效色分離。
  18. The most important specification of the level measurement system is the accuracy. the range measurement accuracy of a fmcw radar is strongly affected by the stability and the linearity of the frequency modulation. thus the vco ' s nonlinearity correcting method is discussed

    利用fft ( dft )頻估計頻率精受fft頻率量化(即線之間的間隔)的限制,對應的fmcw雷達的距離估計精則受掃頻的限定。
  19. The typical erbium - doped fiber gain spectrum is a combination of a high - intensity region and a flat part spectrum, and the power difference has limited the bandwidth of edsfs

    典型的摻鉺光纖增益線由一個峰和後面的肩組成,它們之間的功率差異造成了對光纖陀螺可應用的edsfs和平坦的限制。
  20. The output power, bandwidth and the flatness degree are represented the capability of edsfs

    輸出功率、 3db線的平坦表徵了edsfs的性能。
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