波前反轉 的英文怎麼說
中文拼音 [bōqiánfǎnzhuǎn]
波前反轉
英文
wave-front reversal-
Secondly, the effects of the crest width of the back - emf waveform to the torque ripple in the 120 ? conduction mode are analyzed, among which the effects of the advance commutation angle to the torque ripple are quantificationally analyzed for the bldcm drives whose back - emf waveform crest width is less than 120 ?,
其次分析了120導通方式下反電動勢平頂寬度對轉矩脈動的影響，對于平頂寬度小於120電角的非理想梯形波反電動勢，定量分析了換相超前角對換相轉矩脈動的影響。For the bldcm which has a pseudo - sinusoidal back - emf waveform, this dissertation presents a svpwm control method using six discrete position signals for minimizing the torque ripple. the main aspects for the implementation of this method are analyzed, including the initial orientation of the voltage vector, reasonable choice of the impedance angle and the advance commutation angle, and estimation of the successive rotor positions
針對反電動勢類似正弦的準正弦波反電動勢無刷直流電動機，本文提出一種基於六個離散位置信號的自同步svpwm （電壓空間矢量法）控制方法，用以削弱電磁轉矩脈動，分析了實現這種方法的主要控制環節，包括起動時電壓空間矢量的初始定位，阻抗角與電流超前角的合理選擇以及連續轉子位置的估計等。This behavior leads to predictions of numerous strange phenomena, such as the reversal of the usual doppler effect ( traveling toward a wave results in a redshift instead of a blueshift )
這種特性使大家預測將出現許多奇特的現象，例如反轉的都卜勒效應（朝向波而前進會造成紅移，而不是藍移） 。The speed sensorless techniques for dtc system are very fascinating and challenging subjects recently, they are received wide attention in the literature. some brief description is provided. the proposed approaches are based on speed model of dtc, motor reference adaptive control, the instantaneous reactive power of motor and the extended kalman filter
無速度傳感器調速系統是直接轉矩控制研究領域內一個非常熱門的研究方向，本文介紹了無速度傳感技術的發展歷史及目前的研究狀況，分別利用直接轉矩控制的轉速模型方法，模型參考自適應方法、電機定子反電動勢以及擴展的卡爾曼濾波器等方法設計了無速度傳感器系統，對于其數學模型和系統構成作了比較詳細的推導。Prestack migration method, based on wave motion equation, is also developed for receiver function, and compared with ray method. both p - to - s conversion wave and direct p phase contained in receiver function are migrated and imaged by reverse - time migration for data gather including all receiver functions recorded in all seismological stations for one event, and imaging profile is finally obtained by stacking for all events
本文還在接收函數射線反投影疊加成像的基礎上，提出了一種基於波動方程的接收函數疊前偏移成像方法，將同一事件接收函數中的轉換波和直達p波震相以各自的速度向深度方向逆時延拓成像，並通過不同慢度接收函數的疊加，得到最終的偏移成像結果。In this thesis, a novel structure of silicon - based passive ring waveguide resonation cavity is firstly introduced and designed. the design is combined with the mems technology, which gets rid of the curved waveguides in the previous waveguide ring resonation cavity and facilitates optical integration. the structure has characteristic of " the smaller the resonation cavity, the smaller the loss ", which has a promising future of miniaturization and fits the field of resonation rmog
本文首次提出並設計了一種新結構的硅基無源環形波導式諧振腔，該設計與微機械技術相結合利用集成反射鏡實現光波導直角轉彎，擺脫了以前的波導式環形諧振腔中必需包含的彎曲波導，易於光學集成；同時該結構具有諧振腔越小損耗就越小的特點，有很好的微型化前景，很適合應用於諧振式微光陀螺（ rmog ）領域。The nonlinear influence on multiple carriers signal, such as am / am and am / pm conversion, has been analyzed in this paper. some common linearization techniques, such as feedback, feed - forward and pre - distortion, have also been introduced and compared, which shows that feed - forward is the preferred linearization approach for application in this paper
本文分析了微波功率放大器的非線性特性，特別是am / am轉換和am / pm轉換對多載波信號的影響，也介紹了反饋、前饋、預失真等各種常用線性化技術的基本原理，並對它們的優缺點進行了比較總結。Wave - front reversal
波前反轉There are four sections in my thesis as follows : first, we give the definition of stock market asymmetric reaction, and from abroad, and domestic perspective systematically review and collate the relevant research on asymmetric response of stock market, and introduced mainstream interpretation of asymmetric reaction of the stock market ( the effect of leverage and volatility feedback effects )
即在股市發展前期（ 1993 ? 1997 ）市場波動反應具有非對稱反轉效應（ reversionsintheasymmetricbehaviorofthevolatility ） ，在股市發展後期（ 1997 ? 2006 ）市場波動反應具有杠桿效應。並且非對稱反應幅度隨著時間的推移明顯減小。分享友人