first quadrant 中文意思是什麼
first quadrant
解釋
第一象限-
A virgin material can be "started" from 0 into either the first or the third quadrant.
一個沒有用過的材料可以從0點「開始」進入第一或第三象限。 -
A virgin material can be "started" from point 0 into either the first or the third quadrant.
一個沒有用過的材料可以從0點「開始」進入第一或第三象限。 -
In a separate ceremony, manchester united director and record goalscorer sir bobby charlton buried a time capsule in the new north - west quadrant to commemorate the year of celebration for the club ' s five decades of achievement since the busby babes won their first league championship in 1956
在單獨的紀念堂里，曼聯執行董事和歷史第一射手查爾頓爵士在新的西北角看臺埋下了時間盒來紀念始於巴斯比爵士1956年贏得第一個聯賽冠軍的的俱樂部的50年的輝煌。 -
The six - year molars are the first permanent molars which erupt at the age of six. there are a total of four six - year molars, one in each quadrant, situated right behind the last primary molars. the four molars are vital to the normal occlusion of permanent teeth
小朋友六歲時，他下頜乳臼齒後面長出大牙齒，即第一大臼齒，共有四隻，位置在口腔四端乳臼齒的後面，由於通常在六歲左右長出，故稱為六歲齒。 -
If the received matrix is to be outputted to the first type of transform circuit, the first counter writes each matrix element in a particular dual port memory assigned to the quadrant of the matrix element
假使接收的矩陣將被輸出至第一型式轉換電路，那麼第一個計數器將收到的每一個矩陣元素寫入對應到某一矩陣四分之一象限的特定之記憶體。 -
In order to break through the disadvantage of traditional theory, the thesis bring forward the layer index analysis ( lia ), including the consumer ’ s psychology, advertising psychology, stp tactics. at first, we should set the coordinate axis layer index which make certain the direction of advertising. second, we aim at the targeted consumers to analyze the media arrive, advertising arrive, mind change, purchasing behaviors through the quadrant layer index
為突破傳統理論的不足，本文提出層級指標分析，從消費者的消費心理、廣告心理，運用stp戰略，加以系統地分析和整理，首先得出針對目標顧客的坐標軸層級指標，確定廣告製作和投放的方向和目標；然後再針對具體目標顧客的廣告接受心理和媒體接觸習慣，按照媒體到達、廣告到達、心理改變、購買行動進行象限層級指標的分析，從而準確把握廣告的投放效果，為企業的品牌提升和營銷戰略實施有效的配合。 -
In the cases of and, there has no closed orbit to the system ( * ) in the first quadrant
這里，為某一負值， 。對和不定號的情形，系統（ * ）在第一象限內均不存在極限環。 -
When, there exists at least one limit cycle to the system ( * ) in the first quadrant ; theorem 2. when, there exsits at most one limit cycle to the system ( * ) in the first quadrant ; theorem 3. when, there exactly exists one limit cycle to the system ( * ) in the first quadrant
我們得到下列結論：定理1 、當時，系統（ * ）在第一象限內至少存在一個極限環；定理2 、當時，系統（ * ）在第一象限內至多存在一個極限環，若存在必為穩定的；定理3 、當時，系統（ * ）在第一象限內存在唯一的極限環，且為穩定的。 -
The qualitative behavior of the system at the origin in the interior of the first quadrant is studied
對系統在原點的性態，我們作了全面的分析。 -
First, variable speed constant frequency wind energy convertion theory is described in this paper, then presents a review on the development of wind turbines control and the main types of generator and static converters used to interface variable speed wind turbines to the electric grid. then discuss main circuit constructure and advantage of direct drive wind energy conversion system and introduce pitch - control method for wind power traction and electric power stability. simply aerodynamic characteristic of the turbine is analysised and permanent magnet synchnonous generator math model is established. to convert the variable frequency electricity into utility grid, back to back four - quadrant pwm - vsi is used and three typies of control strategy is presented to capture the maximum wind energy and transmit energy. then simulation is implemented to test the control strategy. in the following chapter a simple ac - dc - ac converter with a dc - dc boosting chopper is proposed to transmit the wind energy into electricity energy and two control strategy is presented
建立了永磁電機和變流器的數學模型，針對雙pwm變頻器的特點提出了三種控制策略對變流器進行控制，通過變流器交-直-交的變換，將發電機發出的變頻變幅值交流電轉化為可用的恆定頻率的交流電，通過pwm調治能使其輸出功率因數為一，並且該控制系統功率因數為可調，能在特殊情況下同電網交換一定的無功功率，並通過對變流器的控制實現了最大風能俘獲的功能。最後採用matlab / simulink進行了模擬，取得了良好的模擬效果。在風力發電系統中，採用先進的最大功率俘獲演算法，能有效的從風中獲得最大的能量。
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