major primary structure 中文意思是什麼
major primary structure
解釋
主要原生構造-
Linear induction motor is an important kind of machines which have some merits such as simple structure, low cost, durability, convenience for maintenance etc. the subject of this thesis is to study a big circular ring linear induction motor, and the major works in this thesis are summarized as follows : ( 1 ) considering the effects of the finite length of primary core, one - dimension analytical solution for the air gap field is cited in this paper. based on it, the single layer winding magnetic field is studied. considering whole - pitched and short - pitched winding configuration with odd poles and half - fulled slots in both ends, the double - layer winding magnetic field is analyzed, respectively
本文對大圓環直線感應電機進行了深入細致研究，內容包括： （ 1 ）本文採用有限長行波面電流作用於有限長鐵芯上的模型，引用了氣隙磁場一維解，研究了單層繞組磁場，奇數極半填槽雙層繞組在採用整距和短距時磁場的分析、比較，簡單介紹了二維解； （ 2 ）用有限元軟體ansoft對大圓環直線感應電機空載氣隙磁場進行了靜態分析，並分析了結果； （ 3 ）用軟體進行了額定電壓下的瞬態分析，得到了轉矩，位移，轉速隨時間變化曲線圖，利用單極性霍爾元件測定轉速並與軟體計算結果進行了比較，採用等效電路法計算了堵轉時的最大電磁力並做實驗進行了驗證，由實驗測得了三相電流波形，並與計算結果進行了比較，對其不對稱性進行了定性分析。 -
Mainly by using the historically comparative experience method, and in view of chinese linguistics and certain relevant theories like bruners structuralism and modern cognitive theories, and yet on the basis of elaborating on discipline structure of teaching chinese literacy in the primary school and the characteristics of child ' s cognitive development, this thesis reflects upon the practice of teaching chinese literacy in china ' s primary school and emphasizes the importance of good resolutions of the following issues : the relation between chinese literacy teaching and chinese teaching system ; the stages of chinese literacy acquisition and the multiplicity of the approaches to such acquisition ; the issue of chinese phonetic alphabet as the instrument of chinese literacy acquisition or as its goal ; major device and auxiliary devices for the development of chinese literacy, etc. and finally by addressing the essential frameworks of the new curriculum standards, the ultimate aim of chinese literacy teaching as well as the striving direction for china ' s chinese teaching reform is defined as " teaching aims at self - teaching "
在對我國小學語文識字教學歷史經驗進行回顧的基礎上，分析其中的合理性與局限性，找出問題的癥結所在，探索如何將漢字構字規律與學生的認知規律有機結合起來，提高識字教學水平，是本文的主要研究目的。本研究主要運用歷史經驗比較法，借鑒漢語言文字學、布魯納的結構主義和現代認知心理學的有關理論，在論述我國小學語文識字教學的學科結構和兒童的認知特點的基礎上，反思我國小學語文漢字教學的實踐，提出識字教學必須處理好幾對矛盾：識字教學與小學語文教學體系、識字的階段性與識字方法的多樣性、拼音是識字教學的手段還是目的、識字的主要方法與次要方法等，結合新課程標準的基本精神，提出「教是為了不教」是識字教學的最終目標，也是我國小學語文教學改革的努力方向。
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