鉆孔電磁法 的英文怎麼說

中文拼音 [zhēnkǒngdiàn]
鉆孔電磁法 英文
borehole electoromagnetic method
  • : 鉆Ⅰ名詞1. (打眼用的工具) drill; auger 2. (指鉆石) diamond; jewel Ⅱ動詞(用尖物在另一物體上轉動) drill; bore
  • : Ⅰ名詞1 (有電荷存在和電荷變化的現象) electricity 2 (電報) telegram; cable Ⅱ動詞1 (觸電) give...
  • : 名詞1. [物理學] (磁性; 能吸引鐵、鎳等的性質) magnetism 2. (瓷) porcelain; china
  • : Ⅰ名詞1 (由國家制定或認可的行為規則的總稱) law 2 (方法; 方式) way; method; mode; means 3 (標...
  • 電磁 : [電學] [物理學] electromagnetism電磁安(培) abampere (電磁系電流單位); 電磁泵 electromagnetic ...
  1. 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 )

    設計了一種基底周期圓結構的(光子)晶體貼片天線,用fdtd方並結合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 。
  2. The performance of the pbg antenna using the new pbg cover together with a pbg substrate is studied by the fdtd method together with the pml boundary treatment. the numerical results show that a more focused beam radiated in the broadside direction is achieved. the gain of the pbg patch antenna in the forward direction is improved by about 6 db. the radiation directivity is improved significantly and reaches 11. 5 db, which is 0. 4 db less than the maximum value that is allowed physically for this size of the antenna ( this difference is about 4. 1 db less than the difference achieved by thevenot et al.,

    用fdtd方並結合pml吸收邊界條件,我們對加了這種新的覆層結構並且基底的復合結構(光子)晶體貼片天線的性能進行了研究,結果證明加了這種新的晶體覆層結構以後,天線的波束收攏很多,並且向前輻射的增益大大提高,與普通天線相比,天線的e面和h面方向圖上向前輻射的增益均提高了約6db ,另外,該復合結構天線的方向性系數達到了11 . 5浙江大學博士學位論文db ,與該物理尺寸天線的方向性系數的理論極限值( 11 . 9db )相差0 . 4db ,該差值比thevenot等人設計的晶體覆層天線的相應差值減少了約4 . 1db ,比qiu等人設計的晶體天線的相應差值減少了約1
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