波導衰減 的英文怎麼說

中文拼音 [bōdǎoshuāijiǎn]
波導衰減 英文
waveguide attenuation
  • 波 : Ⅰ名詞1 （波浪） wave 2 [物理學] （振動傳播的過程） wave 3 （意外變化） an unexpected turn of even...
  • 導 : 動詞1. （引導） lead; guide 2. （傳導） transmit; conduct 3. （開導） instruct; teach; give guidance to
  • 衰 : 衰動詞（衰弱） decline; wane
  • 波導 : [物理學] （用在微波波段傳輸電磁波的裝置） waveguide; duct
  • 衰減 : attenuation; decay; damping; reduction; rejection; weakening; deamplification; dampening; dying o...
  1. Two kinds of filters are presented : by transferring the conventional waveguide cavity filter to the siw, a narrow bandstop filter is designed and simulated, get characteristic of narrow - band bandstop filtering. for example, relative bandwidth 1. 2 %, most attenuation of 48db in band. electromagnetic bandgap ( ebg ) structures present “ forbidden band ” characteristics, siw features high - pass characteristics, so bandpass filters can be composed by combing ebg and siw

    本論文提出了兩種基片集成波導濾波器結構:將傳統的腔體濾波器概念運用於基片集成波導結構，設計出了一種窄帶帶阻濾波器，對其進行模擬，得到了窄帶帶阻濾波特性，如相對帶寬為1 . 2 % ，最大衰減為48db 。
  2. Evaporation ducts, or tropospheric ducts in general, can guide radio waves to distances far beyond the horizon with less attenuation, and then severely impair some certain radio wave system

    以蒸發波導為代表的對流層大氣波導傳播，可使電波在較小的衰減下沿波導傳播得很遠，從而嚴重影響合適的無線電系統。
  3. Its main contributions include the following several aspects : firstly, the dissertation constructs the mathematic model of short baseline orientation determination using two geostationary satellites and analyses the applicable conditions of carrier phase interferometry. orientation determination precision is analysed in depth through both the conventional linearized method and monte - carlo computer simulation method, and the mathematical simulation results show that the linearized method has the shortcoming of fairly low elevation error analysis precision in high latitude area so as not to be very appropriate there. by analyzing the definite factors influencing orientation precision, the dissertation develops the concept of orientation dilution of precision, which uncovers the internal cause of exotic error behavior of bi - satellite orientation, and has important guiding significance for practical engineering applications

    本文系統地研究了基於「北斗一號」衛星載波相位干涉測量原理實現地球靜止雙星定向的相關技術，主要研究成果包括以下幾方面:首先，建立了利用兩顆地球靜止軌道衛星進行短基線定向的數學模型，分析了載波相位干涉測量的適用條件;採用傳統的線性化解析法及蒙特卡洛隨機模擬法兩種途徑對雙星定向的精度進行了詳細分析，數學模擬結果表明在高緯度地區線性化解析法由於俯仰角誤差分析精度略有下降而不太適合;在分析定向精度確定性影響因素的基礎上，提出了雙星定向精度衰減因子odop的概念，揭示了雙星定向誤差特殊表現的內部機理，對實際工程應用具有重要的指導意義。
  4. Main conclusions drawn from the analyses of calculating results are as follows : ( 1 ) the microwave absorption of atmosphere gas have obvious attenuation at the wavelengths for cloud detection, thereinto, the water attenuation effect changes greatly, so the 94ghz cloud detecting radar should have water vapor attenuation correction scheme. ( 2 ) when 37ghz and 94ghz radars detect clouds, the difference between the atmosphere and cloud attenuation and the large variety of radar reflectivity conduce the intension of the radar backscatter signals change. ( 3 ) for the thin cloud layer and low water content of cloud, 37 - ghz radar backscatter signals are not as good as 94 - ghz radar, that is to say that the 94ghz radar has better capability in thin clouds detection

    本工作得出如下結論： （ 1 ）大氣氣體的微波吸收在測雲波段產生明顯的衰減，其中水汽衰減效應變化很大；即將上天的空間94ghz測雲雷達必須有水汽衰減訂正方案； （ 2 ） 37ghz和94ghz雷達測雲，由於大氣和雲衰減不同和雷達反射率的很大差異，導致雷達回波信號強弱不同； （ 3 ）對雲層較薄、含水量較少的雲，在不計雷達參數的情況下， 37ghz雷達回波信號不如94ghz測雲雷達，也就是說94ghz對薄雲有更強的探測能力；對雲層較厚、含水量大的雲，由於強衰減的作用， 94ghz雷達回波信號小於37ghz雷達； （ 4 ）從大氣衰減的不利因素方面考慮，空間94ghz雷達測高層薄雲的效果最好；測低層薄雲時需要考慮氣體衰減訂正；因濃厚雲的強衰減作用，探測其中下部的能力大大減弱，不僅要進行衰減訂正，而且要藉助其他信息來反演整個雲層的含水量垂直分佈； （ 5 ）為了獲得從極薄到極濃厚雲的垂直分佈探測能力，未來測雲雷達系統最好採用雙波長甚至三波長（如94 、 37和13ghz ） 。
  5. The optical rotation in er fluids is studied thoericaly. considering the different attenuation in different direction and the theory of light transmission, i derive the expression of rotation angle as function of the angle 6 ( between the electric vector of linearly polarized light and electric field ) and other parameters on the condition of several appropriates and assumptions

    考慮電場作用下電流變液中不同振動方向的線偏振光衰減不同，根據光波在介質中的傳播理論，推導出光通過電流變液的旋光角與（入射線偏振光振動方向與外加電場方向的夾角）及其它參數的關系表達式。
  6. Abstract : from a universal formula for calculating the attenuation cross section of particles in arbitrary shapes, exact expressions for calcualting the attenuation cross section of polydisperse, small spheroids, whose rotary axes are in specific status, have been derived. attenuation cross sections of both liquid and ice particles in different shapes at different wavelengths in microwave band have been computed and analyzed. the results are informative to microwave remote sensing of precipitation

    文摘:從計算任意形狀粒子的衰減截面普遍公式出發，推導出了小旋轉橢球粒子群旋轉軸處于不同狀態時的衰減截面函數表達式，並計算分析各種狀態下衰減截面隨降水粒子相態、形狀和入射波波長的變化特徵，所得結果可用於降水微波遙感。
  7. The results show the influence of conductivity is minor and can be ignored when the tunnel wall conductivity value is lower than the breakpoint ; however, when the value is bigger than the breakpoint, the influence is greater

    研究結果顯示：當電導率小於斷點時，電磁波衰減率幾乎不受影響，當電導率高於斷點時，電磁波傳播特性會有較大的變化。
  8. Based on analyzing the theoretical model of ultrasonic attenuation, the formula was integrated into the ultrasonic attenuation model, and the relation of ultrasonic attenuation to pulp density and particle size was derived

    在分析超聲衰減基本理論模型的基礎上，將不同粒徑的篩下累積含量集成到超聲波衰減模型中，推導出超聲波衰減與礦漿濃度、粒度之間的關系模型。
  9. Attenuation measurements for the waveguide and the coaxial components

    波導和同軸元件衰減測量方法
  10. An universal equation, which can be directly used to compute the compensation resulted by the surface roughness, was deduced according to the flat - bottomed echo formula

    根據大平底回波聲壓公式推導出了工件表面粗糙度和補償量之間的關系，可直接通過計算得到表面粗糙度引起的衰減量。
  11. ( 二 ) using spectrum analysis investigate the transport character and primary rule of explosion wave in the medium, simulate the formula of attenuation for explosion wave, which will be used to guide the design of the engineering

    （二）採用頻譜分析方法研究了爆破產生的地震波在介質中傳播的特性和基本規律，擬合出了指導工程設計與研究的地震波振速衰減經驗公式。
  12. Research shows : change of temperature & pressure of sand rock results in prominent change of seismic p and s wave velocity and dynamic & static modul and seismic attenuation of sand rock. change of pore liquid character and saturation results in change of seismic p and s wave velocity and attenuation of sand rock

    研究表明：巖石所處的溫度壓力條件的變化將導致縱橫波速度、動彈參數和衰減的顯著變化：孔隙流體性質（含水或油、氣）及飽和度的變化將引起縱、橫波速度、衰減的明顯變化。
  13. The electric field, magnetic field, critical frequency, surface current, power transmission and attenuation, as well as te and tm modes in waveguides are discussed

    給出計算等效矩形截面波導的te模和tm模、電磁場、臨界頻率、波導壁電流、功率傳輸和衰減的公式。
  14. We had fabricated the variable optical attenuator of mmi structure with ridge wave - guide structure and also studied the reactive iron etching of silicon. at last, we tested the variable optical attenuator and draw some conclusions. after testing, we can draw a conclusion that the technology parameter of the device is ideal

    在分析y分支和多模干涉器型（ mmi ）的光學衰減器結構的基礎上，採用脊形波導結構製作了mmi結構的可變光學衰減器，並對硅的刻蝕技術進行了研究和探討，最後對制得的器件進行了測試研究。
  15. This modulator works with the guided - wave reflectance peak, in which the light intensity is changed by the variation of the refractive index of poled polymer due to the electro - optic effects. device performances have been theoretically and experimentally investigated. we also successfully carried out experiments of video signal transmission using the proposed modulator

    該調制器工作于金屬包覆波導的衰減全反射導模吸收峰，利用極化聚合物電光材料的折射率對導模吸收的影響來實現電光調制，並對器件的性能指標進行了實驗研究，同時利用製作的反射型電光調制器進行了視頻信號良好地傳輸實驗。
  16. Firstly, the characteristics of radiation propagation and attenuation in the atmosphere, and the power response of a contrast - limited optoelectic system are analyzed, the apparent contrast model of a target is developed, and the detection range equation dependent on the aerosol extinction coefficient and range parameter are derived

    首先，分析了紅外波段大氣輻射傳輸與衰減、對比度限制光電成像系統功率響應特性，建立了目標表現觀對比度模型，並推導出了由氣溶膠消光系數和距離參量確定的探測距離方程。
  17. Seek the b ( t ) fieldwork curve and the time derivative curve dbz ( t ) / dt from the voltage decrease data generalized from field current that eliminating noise treated by wavelet ; 3

    由經過小波消噪處理過的野外歸一化的電壓衰減數據求出b _ z （ t ）實測曲線和它的時間導數曲線（
  18. Second, the mode fields of a strip waveguide and some slab waveguides have been simulated by applying finite - difference time - domain ( fdtd ) method. the curvature radius ; vicinity coupling ; transition loss and power attenuation of a s - shape bend waveguide have been analysed numerically by employing wide angle finite - difference beam propagation method ( fd - bpm ), as well as the coupling loss of optical fiber and waveguide. in addition, the framework of the s - shape waveguide laser has been

    其次，應用時域有限差分法，結合波導模式理論對條形與平面波導進行了模場模擬;應用廣角有限差分光束傳播法，對s形彎曲波導的曲率半徑、鄰近耦合、過渡損耗、功率衰減以及波導與光纖的各種耦合損耗進行了數值分析，並在此基礎上，對s形波導激光器的結構作了初步設計。
  19. It can be seen from the analyses that light with different wavelength has different losses when it propagates in different waveguide and light with same wavelength also has different loss when it propagates in different waveguide

    從模擬結果可以看出，不同波長的光在同一介質中傳播時的衰減程度不一樣；而同一波長的光在不同波導中傳輸時的損耗也不一樣。
  20. Methods of measurement for waveguides - part 4 : attenuation of waveguide and waveguide assemblies

    波導測量方法.第4部分:波導衰減和波導組件
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