em electromagnetic 中文意思是什麼

em electromagnetic 解釋
電磁的
  • em : n 1 字母 M m 2 【印刷】全身〈12點的字母 m〉。3 歐美文字排版的字行長度單位。pron 〈pl 〉 〈口語〉...
  • electromagnetic : adj. 電磁的。
  1. In this dissertation, the principle of fem in em was discussed, then the pulse radar and three - layered pavements were analyzed with 20 - noded and 4 - noded isoparametric elements respectively. then, corresponding fem programs are compiled in fortran90. so a forward model was built up to describe the transmitting of electromagnetic in the radar and pavements, according to the system identification method

    針對上述情況，本文系統闡述了電磁場有限單元法的基本原理，然後採用二十節點、四節點等參單元分別對pulse雷達實體及三層路面系統進行了靜態場和時變場的有限元分析，初步建立了電磁波在三層路面中傳播的正演模型，同實測波形相比，模擬效果較好，並用fortran90語言編制了相應的三維、二維有限元程序，具有較好的可讀性和可移植性。
  2. Overlapping, nonoverlapping and overrelaxation ddm are discussed. electromagnetic ( em ) scattering by electrically large open - ended cavities is analyzed by ddm / fem - bie

    討論了重疊ddm 、非重疊ddm和超鬆弛ddm的迭代過程及其在eb一fem中的應用。
  3. At the same time, as more and more radio sources have been set up, electromagnetic pollution in urban area becomes more serious, which is harmful to people ' s healthy and communication system so it is necessary to simulate the electromagnetic propagation in urban area by computer being an approximate hf method in evaluating em scattering ， the complex ray method （ crm ） is valuable in actual applications ， mainly benefited from its simple physical model ， convenient mathematical formulation and computational efficiency, especially with the scenes of scattering from complex objects based on the condition mentioned above, a hybrid ray model of the urban area electromagnetic wave propagation prediction was established with the foundation of ray tracing theory and complex ray theory

    復射線技術作為一種求解波場問題的高頻近似方法，由於其具有物理模型簡單、數學處理方便、計算效率高等優點，在復雜的目標散射特性分析等應用領域中有著重要的應用價值。基於以上的情況，本文在射線追蹤理論和復射線理論的基礎上，為城區環境建立了混合射線預測模型。本文採用橢圓模型對已有的射線追蹤方法進行加速，並將復射線理論應用到城區環境電波傳播預測中，提出新的預測方法混合射線方法。
  4. Thanks to the support of the national natural science foundation of china under grand no. 50277036 for " the pulse electromagnetic fields and system - level em radiation of electric vehicles ", this thesis concentrated on the design of the variable voltage and variable frequency ( vvvf ) system and the development of a genetic algorithm for vector optimal design problems. the work includes mainly four parts : a brief introduction of the frequency - converter, the emc design of the vvvf system and the national standard of the electromagnetic interference of the vvvf system, the study of global search optimization algorithms, and an improved genetic algorithm called emigration genetic algorithm for multi - objective optimal problems

    在國家自然科學基金資助項目《電動汽車脈沖電磁場與系統級輻射的研究》的工作基礎上，本文對電動車電磁輻射關鍵部分? ?變頻調速系統的電磁兼容性設計以及在電磁兼容性設計中涉及到的電磁系統的多目標優化方法進行了系統的分析和研究，其核心內容包括：變頻器工作原理；變頻調速系統電磁兼容性設計及變頻調速系統電磁兼容標準；隨機類全局優化演算法研究；提出了一種改進的遺傳演算法命名為遷徙遺傳演算法。
  5. Absorbing properties of single layer absorbing materials are determined by complex permittivity, complex permeability, thickness, frequency and so on. the external electromagnetic ( em ) parameters of materials lie on ingredients " content and em parameters

    單層吸波材料的吸波性能主要取決于材料的復介電常數、復磁導率、材料厚度及使用頻率等因素，而該層的宏觀電磁參數又取決于各組分的電磁參數及其含量。
  6. Presented in this dissertation is a method for computering near - field and far - field characteristics of an em source from its near - field measurements taken over an arbitrary shaped geometry, which can be applied to electromagnetic compatibility problem

    本論文介紹應用於電磁兼容問題中的一種電磁輻射源的近場到近場遠場的轉換方法。利用任意近場幾何面上的輻射源的測量數據推算出其近場和遠場輻射特性。
  7. We have mentioned radio waves, infrared, visible light, etc. they are all different forms of the electromagnetic wave em wave

    .以上所提及的可見光紅外線無線電波等等，其實全部屬于電磁波。
  8. Electromagnetic compatibility em

    電磁環境兼容性
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