電介質色散 的英文怎麼說
中文拼音 [diànjièzhíshǎisǎn]
電介質色散
英文
dielectric dispersion-
The ionosphere is a complex medium, which is aeolotropy, asymmetry, dispersive and changes randomly with time. in order to improve the communication quality of the shortwave that depends on the ionosphere, we should have aknowledge of the current condition of the ionosphere in real time. the backscatter sounding of high frequency can diagnose the real - time channel characters for shortwave communication or hf radar, which is great assistant to shortwave communication and hf radar
電離層是隨機時變，各向異性，非均勻、色散的復雜介質。為了保證依賴于電離層進行的短波通信質量，必須了解電離層的實時狀態信息。高頻返回散射探測可以實時監測與短波通信或高頻天波雷達相關的天波傳播通道的狀態，對短波通信和天波雷達工作起了重要的輔助作用。Magnetostatic wave ( msw ) is a kind of slow dispersive wave propagating in magnetic medium, which is also a microwave electromagnetic wave. so the propagation characteristics of msw can be controlled by bias magnetic fields
靜磁波（ msw ）是一種在磁性介質中傳播的慢色散波，也是一種微波電磁波，可通過磁控方法改變靜磁波的傳播特性，並與具有電磁性的物質發生作用。Fdtd analysis of dispersion characteristics of 2d dielectric photonic crystal described by effective permittivity in grid
採用等效介電常數時域差分法分析二維介質型光子晶體色散特性The dielectric constant of srtio3 ( sto ) thin films is voltage - dependent near the curie temperature tc ( about 40k ). and no dispersion in is observed in sto at frequencies up to 10 ghz. yba2cu3o7 - x ( ybco ) high temperature superconducting thin film has very low microwave surface resistance
Srtio3 （ sto ）薄膜在其居里溫度附近（ ~ 40k ）具有介電常數隨電場強度變化而變化的性質，同時sto在10ghz以下介電常數沒有頻率色散性。Then, the auxiliary fields fdtd is used to the periodic structure made of dispersive material, such as the pyramid absorbers in anechoic chamber. the permittivity vs frequency property of the absorber is approached by some dispersive equation model, such as debye model and lorentz model, so the broadband response of the absorber can be gotten through one calculation
然後將輔助場fdtd應用到色散媒質周期結構中，導出了色散媒質中的迭代式，並以暗室吸波材料陣列為例進行計算，提出用某一類型的介電常數色散函數（如debye型、 lorentz型等）來逼近材料的介電常數頻率特性的方法，從而可以對吸波材料進行一次性寬頻計算。In 6. 635, topics covered include : special relativity, electrodynamics of moving media, waves in dispersive media, microstrip integrated circuits, quantum optics, remote sensing, radiative transfer theory, scattering by rough surfaces, effective permittivities, random media, green ' s functions for planarly layered media, integral equations in electromagnetics, method of moments, time domain method of moments, em waves in periodic structures : photonic crystals and negative refraction
本課程所覆蓋的論題包括：狹義相對論、運動媒質的電動力學、色散媒質中的波、微帶集成電路、量子光學、遙感、輻射傳輸理論、粗糙表面上的散射、有效介電系數、隨機媒質、平面層狀媒質的格林函數、電磁學中的積分方程、矩量法、時域矩量法、周期結構中的電磁波：光子晶體和負折射率。By a large amount of calculations, the influence of the structure dimensions and the dielectric parameters on dispersion characteristic and coupling impedance of this kind of slow - wave structure is obtained. then, the linear beam - wave interaction theories of the arbitrarily - shaped helical groove waveguide and the dielectric into the arbitrarily - shaped helical groove waveguide are deduced. by the numerical calculations, the relationship is got between the small signal gain, bandwidth, electromagnetic " hot " velocity and the electronic beam, the structural parameters
通過數值計算，獲得了此類慢波結構的色散特性和耦合阻抗隨結構幾何尺寸和介質參數的變化規律;在此基礎上，建立了任意槽形螺旋槽及中心加介質棒的任意槽形螺旋槽行波管的注-波互作用線性理論，並編製程序，計算了管子的小信號增益、帶寬、電磁慢波的「熱」相速與電子注參數、結構參數之間的關系，獲得了增加帶寬或增益的途徑。Quantum coherence and interference have led to the observation of many new effects and new techniques in quantum optics and atomic physics. examples include coherent population trapping, electrom agnetically induced transparency, lasing without inversion, and enhancement of the index of refraction without absorption
當應用相干場來驅動光學介質時，可以使得介質的吸收和色散關系發生極大改變，產生許多新的效應，如相干布居捕獲、電磁誘導透明、無反轉激光、無吸收折射率增強等。3. in order to show the fact that the - licrowave modulates the background plasma density and the density grating influences the propagation of the microwave in return, the dispersion relation of the dielectric cerenkov maser filled with plasma grating is derived when the modulation parameter is varied
三、為了反映等離子體被微波場調制從而形成密度周期性分佈的等離子體柵，反過來影響電磁波的傳播這一物理事實，在調制系數變化的情況下，從等離子體柵的等效模型出發，推導了等離子體柵填充的介質cerenkov脈塞的色散方程。In this paper a newly develoed helical coordinates is used to make out the solution of electromagnetic fields in the helix gap and calculate dispersion characteristics of tape helix slow wave structure for the first time. strict boundary conditions for magnetic fields are adopted and are treated rigorously by fourier expansion. besides, the radial propagation constant of every layer in the dielectric - loaded region is differentiated. some of practical tape helix slow wave structures have been calculated for dispersion characteristics and the calculated values accord with measured values very well. the authors also compare the calculated results with experiments for different structures by changing tape thickness or other structure parameters and find that the theory in the paper is universal
本文首次運用螺旋坐標系給出了帶狀螺旋線縫隙內的電磁場解，並據此計算了帶狀螺旋慢波結構的色散特性.文中採用了嚴格的邊界條件，並以傅立葉展開進行了嚴格的數學處理.另外還首次對有介質區域內各層的徑向傳輸系數作了區別.本文使用這種方法計算了我們已研製的一些寬帶高功率行波管所用的慢波線結構的色散特性，理論與實驗符合得很好.我們還計算了不同結構參數對色散特性的影響，並與實驗作了對照，發現本文的理論有一定的普適性分享友人