coherent group 中文意思是什麼
coherent group
解釋
結合群-
On the basis of previous research works, new exploration wells, new appraisal wells and 3d seismic material are added to new research work in which rock and mineral, sedimentary facies and oil bearing characters are studied deeply by employing the methods of petroleum geology, sedimentary geology and reservoir geology. the results of reservoir prediction on fluvial sandbody in the upper of formation of guantao group obtained by using coherent analysis and acoustical impedance inversion bring good effect to the exploration and development of chengdao oilfield
本文在以往工作的基礎上，補充新鉆探井、評價井和三維地震資料，運用石油地質學、沉積地質學、儲層地質學等原理方法，對埕島油田主力含油層系館上段地層的巖礦、沉積相及油氣富集特徵進行了深入的研究，對館上段河流相砂體進行了以測井約束地震反演為主的儲層預測研究，研究成果為繼續開展埕島油田的勘探開發提供了重要依據。 -
Due to the short distance among the planes which fly in a group, the conventional low resolution radar can not distinguish them in both distance and azimuth ? if we use the technology of isar to resolve the difference among doppler frequency of the targets and obtain a fine resolution cross - cross image, we may separate them, but a long time of coherent processing is needed <, for the formation targets, it can be approximately divided to rigid body and nonrigid body, so for the formation targets, that can be regarded as rigid which has a relative position and an identical movement, can be approximately considered as a large target, and be compensated by translational phase with the rule of minimum entropy, but for the most those cannot accord with the approximation of rigid, being the doppler - frequency of the aim is linear changed, by the relax method with short data, increases the resolving performance of multiple target to the aim in the frequency domain, since cross - range resolution is based on the accumulative time, so it is greatly improve the resolution to formation targets by the instant cross - range image which produced by radon - wigner transformation
低分辨isan成像及干涉技術應用研究一因此直接無法分辨編隊目標的架數，我們借鑒isar的技術，通過較長時間的相干積累，在多普勒頻域上對目標進行分辨。而對于編隊目標，可分為近似剛性的多目標和非剛性的多目標，所以對于可以近似為剛體的編隊目標相對位置固定，運動方式一致，可以近似看作一個大目標，採用最小墑準則對平動相位的進行補償，但是大多數並不滿足剛體近似的編隊目標，由於目標在相干積累時間的多普勒頻率近似呈線性變化，通過對較短數據利用relax的時頻分析方法，提高了頻率域上目標分辨的性能。由於橫向解析度取塊于橫向積累時間，所以利用radnwigner變換得到瞬時的一維橫向距離像大大提高了對編隊目標的分辨，對模擬和實測數據的大量分析結果表明此方法的有效性和可行。 -
On the following, on the basis of formulas given above, three kinds of effects due to ionosphere are presented : image shift due to group delay which was caused by the difference between the group velocity and the velocity of light in the ionosphere ; image distortion due to ionospheric dispersion which can create second phase error of lfm signals ; the last, the phase perturbation caused by the irregularities of the ionosphere can reduce the coherent length and affect azimuthal resolution
文中主要研究了電離層的三種影響：信號經過電離層傳播的群延遲引起的成像偏移；電離層的色散效應給線性調頻信號帶來二次相位誤差，導致圖像退化、失真；以及電離層的閃爍、湍流等不規則性引起的信號相位起伏。在此基礎上，比較分析了不同波段、帶寬條件下電離層的影響。 -
Intermediate class ( middle class ), also known as the middle class, the middle class, and it does not belong to the marxist sense of ownership relations pure class areas, but sociological sense lifestyles, values, occupational characteristics, such as self - perception and social convergence with the evaluation of a coherent group identity
中間階層（ middleclass ） ，又稱中產階級、中間階級或中產階層，它並不屬于馬克思主義經典理論所指稱的純粹階級范疇，也不是某一個階層的代稱，而是社會學意義上經濟地位、價值取向、職業特徵、自我感知等趨同及社會評價與認同一致的一個群體。 -
Based on the group - theoretical structure for the density - dependent multi - photon jaynes - cummings model, we have constructed the dressed su ( 2 ) coherent state. the atom and field squeezing and the anti - bunching effect for the system evolving from the dressed su ( 2 ) coherent state have been studied. in conclusion, we have discovered some new field and atomic squeezing in different systems, proposed a new kind of quantum state and discussed photon anti - bunching effect, sub - poissonian statistics distribution
5 .基於密度相關的多光子j那mes一c ~ gs模型的群結構，定義了密度相關的多光子jaynes一c ~ gs模型的修飾su （ 2 ）相干態，並研究了系統以修飾su （ 2 ）相干態作為初態的原子和光場的壓縮，光子的反聚束等效應。
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