尾跡 的英文怎麼說
中文拼音 [wěijī]-
Condensation trails contrails produced by aircraft
飛機航行時所產生的凝結尾跡。Condensation trails contrails are formed high in the sky where water vapour from aircraft exhaust condenses in the surrounding cold air, producing water droplets and or ice crystals
飛機在高空航行時排出水氣，水氣被周圍的冷空氣冷凝下來，結成水點或冰晶，在高空留下了一條痕跡，稱為凝結尾跡。Condensation trails ( contrails ) are formed high in the sky where water vapour from aircraft exhaust condenses in the surrounding cold air, producing water droplets andor ice crystals. they appear as narrow, sometimes rather straight, streaks on satellite cloud images
飛機在高空航行時排出水氣，水氣被周圍的冷空氣冷凝下來，結成水點或冰晶，在高空留下了一條痕跡，稱為凝結尾跡。We can get electron density with the calculated phase and some common model formula ( such as sphere and cone ) in the wake of hypervelocity projectiles
由計算出的相位並根據彈道靶尾跡的一些常用模型（包括圓球體、鈍錐體等）公式，把相位轉化為尾跡的電子密度。Oliver(1942, 1948)has followed meteor trails to measure winds.
奧利弗（1942，1948）曾跟蹤流星尾跡測量風。Second, the imaging model built here has taken into account the tilt modulation, the hydrodynamic modulation, and current modulations of radar cross section. consequently, it has realized the imaging simulation of four kinds of wakes with the same imaging model. third, the orbital velocity of ocean wave was considered as the basic dynamic factor, and the imaging model calculates the influence on raw data by the wave m ovement according to the orbital velocity
該模型的主要特點是： （ 1 ）它採用了三尺度復合表面模型的思想來計算海面的電磁散射，考慮了中等尺度波對紋波的進一步調製作用，彌補了傳統雙尺度模型的不足； （ 1 ）它考慮了海浪的傾斜調製作用、流體動力調製作用和流場對雷達截面的調製作用，實現了用統一的模擬模型對四種艦船尾跡特徵進行成像模擬； （ 3 ）它把海面長波的軌道速度作為基本的動態成分，並依此來考慮海面運動對sar回波信號的影響。The oscillation is called a laser wakefield because it trails the laser pulse like the wake produced by a motorboat
這個震?稱為雷射尾跡場，因為雷射脈沖的軌跡，就像機船在海面上所產生的船痕。Researchers thought that such precise injection was impossible in a laser wakefield accelerator because the accelerating structure is microscopic and short - lived
研究人員認為在尾跡場加速器中不可能這麼精準的注入電子，因為加速的過程是微觀而且短暫的。In chapter 2, a simplified analytical model is presented for the analysis of the bvi mechanism, adopting the beddoes " prescribed wake model. by this model, the azimuthal location and miss - distance of the bvi and the radiation directivity of the bvi noise are calculated and discussed, and some conclusions are obtained
在第二章，使用beddoes預定尾跡模型，建立了一個用於旋翼槳-渦干擾特性機理分析的簡化數學模型，分別對旋翼槳-渦干擾位置、槳-渦干擾距離和聲輻射方向性等進行了計算和分析，得出了有意義的結果。Major features appearing on the image include contrails light blue, deep clouds white, high clouds light blue and fog mist low clouds red - smooth in texture
圖中可見凝結尾跡淺藍色，厚雲白色，高層雲淺藍色及霧低層雲紅色，質感較柔和。Based on an engineering background, through numerical simulation of the flow field in the hp turbine of the energy efficient engine ( e3 ), the article research the unsteady flow in a transonic turbine stage, the unsteady phenomena in the stage include the shockwave, wake, shedding vortex, endwall vortex, passage vortex and leakage vortex, etc. there are two shockwaves generated on the vane the tailing edge, one on suction side is named moving shockwave, and name another on pressure side steady shockwave
本文首先對于研究的意義和國內外研究的現狀做了簡要的介紹，再從某工程背景出發，通過對e3發動機高壓渦輪內流場的數值模擬，研究了干涉的周期性的問題，以及渦輪級內常見的非定常現象：激波、尾跡、脫落渦、根腳渦、通道渦、漏流渦。導向器尾緣會出現兩道激波，在吸力面的激波可稱為「運動」激波，壓力面的激波可稱為「定常」激波。In chapter 5, a new dynamic wake model is developed by employing the rotor free - wake method in chapter 2, and is used to investigate the curve distortion during the conversion of tiltrotor aircraft between helicopter flight conditions and airplane flight conditions
在第二章方法的基礎上，第五章建立一個傾轉旋翼動態尾跡模型，使用該模型對傾轉旋翼機傾轉過渡狀態的尾跡彎曲變形進行了研究，得出了一些結論。Enhanced unsteady and nonlinear rotor wake model for real - time flight simulation
一種適合飛行模擬應用的非定常非線性旋翼尾跡增強模型The state - of - the - art of the study of ship and ship wake detection is summarized. the target types of the ship and its wake in different resolution sar images are analyzed and a conclusion is draw. the issue of ship target detection to the low or middle resolution sar image is point target detection while the issue to the high - resolution sar image is hard target detection
本文在文獻綜述的基礎上，全面分析了sar圖像艦船目標及其尾跡檢測的研究現狀，通過應用sar圖像理解的基本理論，分析了不同解析度圖像中艦船目標及其尾跡的類型，並得出結論：中低解析度sar圖像中的艦船目標檢測是點目標檢測；高解析度sar圖像中的艦船目標檢測是硬目標檢測； sar圖像艦船尾跡檢測是線性目標檢測。The results indicated that the generation of trailing - vortex of downstream adjacent vanes could be restrained effectively by upstream wake when the passing frequency and the amplitude of wake defect satisfy some conditions, associated with a significant enhancement of time - averaged aerodynamic performances : loss coefficient reducing 40. 2 % and the ratio of loading coefficient and loss coefficient increasing 93 %
研究表明：滿足一定通過頻率和虧損幅值條件的尾跡能夠有效抑制下游相鄰葉排尾緣渦的生成，達到控制或是推遲附面層非定常分離的目的，從而使得流場時均性能大幅度的提高，損失系數降低了40 . 2 % ，功損比增加93 % 。Numerical simulation of unsteady vortex in the wake of cascade flow
葉柵流場尾跡中非定常渦系的數值模擬Major features appearing on the image include contrails ( light blue ), deep clouds ( white ), high clouds ( light blue ) and fogmistlow clouds ( red - smooth in texture )
圖中可見凝結尾跡（淺藍色） ，厚雲（白色） ，高層雲（淺藍色）及霧低層雲（紅色，質感較柔和） 。A focal plane imaging is limited in catching object when spot - focusing horn lens antenna is applied in ballistic wake microwave interferometer. so we consider to designing multiple beam focusing horn lens antenna in order to augment the range of catching and enhance the probability of hitting the target
本文的主要工作是針對彈道靶尾跡微波干涉儀里的點聚焦單波束捕捉目標的有效性能不足，而考慮設計一個具有點聚焦特點的多波束聚焦透鏡天線，以增大捕捉范圍和提高中靶率。Eventually mode a and b coexist in the wake, which confirms the previous studies. besides, the present paper finds that downstream the streamwise
從圓柱表面到旋渦形成區、到近尾跡再到下游尾跡流向渦結構從模式a轉換到模式b 、雙渦對模式、再恢復為模式a 。The technology renovation project " application of frequency sweep microwave interferometer method to the measurement of electron densities in the wake of hypervelocity projectiles " is the research work of this thesis
具體要求是將所研製的掃頻式微波干涉儀應用於某氣動物理靶中對等離子體尾跡進行電子密度的測量。分享友人