背向輻射 的英文怎麼說
中文拼音 [bēixiàngfúshè]
背向輻射
英文
back radiation-
A patch antenna with air holes in the substrate has been designed. the finite - difference time - domain ( fdtd ) method together with the perfectly matched layer ( pml ) boundary treatment has been used to study the performance of the antenna. it is shown that the surface waves are significiently suppressed, the frequency bandwidth is improved, the sidelobe levels are reduced and consequently the gain in the forward direction is improved by 14 db ( about 4 db higher than the value reported previously )
設計了一種基底鉆周期圓孔結構的電磁（光子）晶體貼片天線，用fdtd方法並結合pml吸收邊界條件對該天線進行了研究，結果表明本文所設計的基底鉆孔型電磁晶體貼片天線取得了多方面的性能改善，與普通天線相比，基底中的表面波受到很大抑制，天線的帶寬增加，遠場方向圖上天線的旁瓣和背瓣被明顯削弱，向前輻射的增益由原來的12db增加到26db ，增加了14db ，比文獻上報道的gonzalo等人的研究結果提高了4db 。The thesis is based on the subproject of national " 973 " key project, " hxmt spacecraft integral analysis and design ". aiming at the satellite power system, it establishes a simulation software, and uses it on the hxmt power system designing and simulation
本文以國家973專項課題「天體高能輻射的空間觀測與研究」的子課題「 hxmt衛星系統方案設計」為應用背景，構造了一個面向衛星電源系統的模擬軟體，並對hxmt天文衛星電源系統進行了設計分析和模擬工作。( 3 ) response of the radiate sand ridges to the relative sea - level rise based on the background of sea - level rise in the future and the features of sediment dynamics on the radiate sand ridges, the rule and tendency of the development of the radiate sand ridges were analyzed using the data collected in situ and the long - term satellite images of the region. and concluded that the radiate sand ridges will be adjusted greatly in response to the relative sea - level rise and the enhancement of tidal dynamics
（ 3 ）輻射沙洲對海面上升的響應基於輻射沙洲區未來海面上升的背景和輻射沙洲自身的泥沙動力特徵，用實測資料和遙感技術分析了輻射沙洲區近期的演變規律，並對輻射沙洲未來整體的動態變化特徵和發展趨向做了預測，認為輻射沙洲整體在海面上升過程中隨著潮汐動力作用的增強將做出重大調整。Secondly, typical approaches of studying on vegetation have included radiative transfer, four - stream, geometric optics, hybrids of two or more of these, and numerical simulation. then we introduced several models for density or sparse vegetation, soil and desert
然後，簡單論述了建立植被散射模型的發展動態和幾種典型方法：輻射傳輸模型、四通量模型、幾何光學模型以及復合模型等，初步研究了用於稠密植被、稀疏植被、土壤、沙漠等環境背景的雙向反射函數模型。The nobel prize in physics goes to john mather and george smoot " for their discovery of the blackbody form and anisotropy of the cosmic microwave background radiation
2006年的諾貝爾物理學獎授予了美國科學家約翰?馬瑟和喬治?斯穆特，以表彰他們發現了宇宙微波背景輻射的黑體形式和各向異性。Scientists used wilkinson microwave anisotropy probe wmap to capture the cosmic portrait that reveals the afterglow of the big bang, i. e. the cosmic microwave background radiation
科學家利用威爾金森微波各向異性探測器wilkinson microwave anisotropy probe ， wmap ，測量來自不同方向的宇宙微波背景輻射，展示了大爆炸后的餘輝。The high homogeneity and isotropy shown in the cosmic microwave background ( cmb ) prove that the universe has been in existence for around 15 billion years
微波背景輻射顯示的宇宙高度的均勻性和各向同性說明，宇宙已經存在了約150億年左右。This star has a non - zero temperature and there is heat conduction between the star and the surrounding radiation. possible experimental tests are discussed briefly
該星體被放置在一個均勻、各向同性的宇宙微波背景輻射場中，星體與背景輻射場之間存在著熱傳導。With these backgrounds, the object being investigated in this article is composite metallic and dielectric structure which is composed by piecewise homogeneous, linear and isotropic medium, the problem being investigated is the complex scattering and radiation problem, the intention being investigated is modeling and fast computing the electromagnetic characteristic of electric large complex structures with uniform method, the final objective is developing general fast electromagnetic computing software to solve the realize electromagnetic computing problems in engineering
本文就是圍繞這一背景展開的，研究對象是由分塊連續、線性、各向同性媒質組成的「金屬與介質混合結構」 ，研究問題是復雜的散射和輻射問題，研究目標是以統一的方法對電大尺寸復雜結構作電磁建模與快速計算，最終目的是開發通用的電磁計算程序，來解決一些工程中的復雜電磁計算問題。分享友人