group velocity 中文意思是什麼

group velocity 解釋
【物理學】波群速度。

  • group : n 1 群；批，簇。2 集團，團體，小組。3 【化學】基，團，組；（周期表的）屬，族。4 （雕塑等的）群像...
  • velocity : n. 1. 迅速；快速。2. 速度，速率。3. 周轉率。
  1. The group velocity is the speed at which modulated signals would be transmitted.

    群速度就是將調制信號發送出去的速度。
  2. Negative group velocity in the band gap range

    禁帶區域內負的群速度
  3. Analytic expression calculating group velocity for anisotropic elastic media

    各向異性固體彈性介質中群速度的解析表達式
  4. Electromagnetically induced transparency and slow group velocity in pr3 y2sio5 crystal

    晶體中電磁感應光透明及群速度減慢
  5. With any signal you can talk about two speeds called the phase velocity and the group velocity

    對于任何信號都有兩個速度即相速度和群速度。
  6. Group velocity ( simulation output image created using matlab ? software. ) ( provided by prof. chiang c. mei

    波群速度（使用matlab ?軟體產生的模擬輸出影像） 。
  7. Based on the wavevector diagram and group velocity, the property of light in photonic crystals can be analyzed quantitatively

    基於波向量圖和群速度，可以很好地分析光在光子晶體中的行為。
  8. ( 4 ) the correlation property between the distribution of attenuation factor and that of the group velocity is indicated, in this study

    （ 4 ）研究結果顯示，在頻率域內，面波衰減系數分佈與群速度分佈具有一定的相關性。
  9. The group velocity ( u ) corresponds to the net result from the addition of all elements with different periods and different velocities within the wave motion

    而群速度（ u ）符合於波動的不同周期，不同速度的各種因素疊加的凈結果。
  10. The wavelet transforms were applied to identify the group velocity of flexural waves which were measured and recorded by the strain gauges and a computer

    布建於鋁合金板表面的應變規，是用以偵測經激震器沖擊平板后所產生的應變波訊號。
  11. There has been a revolutionary advance in ultrashort pulse technology since the discovery of self - mode locking of ti : sapphire lasers. few - femtosecond pulses have already been generated from ti : sapphire lasers, by means of combining self - phase modulation with negative group velocity dispersion, which is similar to the way of soliton generation

    鈦寶石激光自鎖模的發現使得超短脈沖技術發生了革命性的變化，利用自相位調制和負群速度色散結合的類孤子產生方式，人們已經在鈦寶石鎖模激光器上得到了脈寬只有幾個飛秒的光脈沖。
  12. The group velocity(u) corresponds to the net result from the addition of all elements with different periods and different velocities within the wave motion.

    而群速度（U）符合於波動的不同周期，不同速度的各種因素疊加的凈結果。
  13. X4 ? gridding attenuation and 2 ? x2 ? gridding group velocity are calculated respectively, based on the attenuation and velocity, the distribuation of rayleigh wave quality factor qr are yielded finally. ( 3 ) building the s - wave quality factor og3d structure of the continental crust and upper mantle of china area

    為此把中國大陸區域劃分成4 4網格和2 2網格，利用lsqr方法分別進行衰減系數和群速度網格化反演，得到4 4單元格的衰減系數分佈和2 2單元網格的群速度分佈。
  14. We have calculated and plotted the curves of the refractive index, group velocity index, lowest - order and second - order dispersion indexes as a function of wavelength. the lowest - order and higher - order dispersion - induced broadening and deforming of light pulses is analyzed for various pulse shapes, such as gaussian, super - gaussian and hyperbolic secant pulses

    給出了折射率、群速指數、低階和二階色散系數隨波長變化的關系曲線，研究了高斯脈沖、超高斯脈沖和雙曲正割脈沖等超短脈沖在clbo晶體中傳播時，由於低階色散和高階色散引起的脈沖展寬和形變。
  15. ( 2 ) calculating the gridded rayleigh wave attenuation factor y and group velocity. the lsqr algorithm is used to inverse the attenuation factor and group velocity under 4 ? x4 ? gridding and 2

    （ 2 ）進行rayleigh波衰減系數、群速度網格化純路徑衰減反演計算，得到網格單元純路徑衰減系數和群速度分佈結構。
  16. Generally speaking, the high group velocity and low attenuation factor and high qr in the same area, but relatively low group velocity and high attenuation factor and low qr in the same area in china is the general distribution

    在不同周期，面波衰減系數或品質因子在整個中國大陸區域分佈是不均勻的；總體表現為高群速度分佈的區域呈現高叢和低衰減系數、低群速度分佈的區域呈現低叢和高衰減系數分佈的特點。
  17. In chapter 3, spatiotemporal instability of ultrashort pulses results from the interplay among diffraction, group - velocity dispersins and nonlinearity. we use the model proposed by brebec et al.,

    第三章：超短脈沖的時空不穩定性是衍射、群速度色散和自相位調制三者之間的相互作用導致的。
  18. The origin of supercontinuum ( sc ) generation in optical fibers has been conjectured to be the interplay between fiber nonlinearities ( self phase modulation, cross phase modulation and raman self scattering ) and group - velocity dispersion ( gvd )

    光纖中超連續supercontinuum （ sc ）譜的產生源於光纖中各種非線性效應（自相位調制效應、交叉相位調制效應，四波混頻效應及受激raman散射等）和群速度色散的共同作用。
  19. Based on these foundations, we give a perfect scheme of the bbo opos : single pass amplification coefficient of the opg under different pump intensity is calculated ; collinear type - i and type - ii phase matching tuning curve pumped by the q switch nd : yag various harmonics as well as noncollinear type - i tuning curve are calculated in details ; the effect of the walkoff for the nonlinear effect coefficient and the group velocity matching are analyzed ; the acceptance angle in parametric process is calculated ; the numerical threshold of the bbo opo is calculated ; the process of the saturation and depletion of the pump beam are analyzed ; the relationship of the conversion efficiency and reflectance of output mirror are discussed ; various linewidth controlling methods are discussed ; the improvement of the beam quality applying the unstable cavity is discussed ; and the crystal bbo design is considered

    在此基礎上，給出了一整套bbo - opo激光參數設計方案：計算了不同泵浦強度下的參量放大倍數；詳細計算了在nd : yag調q激光器各次諧波泵浦條件下的共線類和類相位匹配的調諧曲線，以及非共線類相位匹配調諧曲線；分析了走離角對非線性系數和群速匹配的影響；計算了參量過程的允許角；計算了bbo - opo的理論閾值條件；分析了飽和與泵浦光束的消耗過程；給出了轉換效率與超過泵浦閾值的倍數的關系；討論了轉換效率與輸出鏡反射率的關系；討論了線寬控制的各種方法；研究了利用非穩腔改善光束質量的方法；考慮了bbo晶體的設計。
  20. The phase matching and group velocity matching conditions of type - i and type - ii second harmonic generation ( shg ) are obtained according to the momentum and energy conservation laws. the group velocity delay of ultrashort pulse shg on clbo and the crystal length decided by the group velocity delay are analyzed and compared with bbo ' s

    從動量守恆、能量守恆出發推導得出了超短脈沖倍頻的類、類相位匹配和群速匹配條件，對clbo晶體用於超短脈沖倍頻時的群速延遲以及由群速延遲決定的晶體長度進行了分析和數值模擬，並與bbo晶體進行了比較。
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