deviation in lead 中文意思是什麼

deviation in lead 解釋
導程偏差
  • deviation : n 1 脫離，越軌，背離 （from） 。2 偏向，偏差。3 （統計上的）誤差。4 【航海】（故意）偏航。5 【數...
  • in : adv 1 朝里，向內，在內。 A coat with a furry side in有皮裡子的外衣。 Come in please 請進來。 The ...
  • lead : n 1 鉛，鉛製品。2 【航海】測鉛，測深錘，水砣。3 〈pl 〉（鋪屋頂的）鉛皮；鉛皮屋頂；【印刷】插鉛，...
  1. However, the critical path of the project hinges mainly on the delivery of the equipment and engineering contracts where the lead time is usually longer than the construction schedule. with equipment and engineering contracts committed much earlier, the group does not expect any major deviation in the overall project commissioning timeline

    但設備和工程合約的付運是項目進度最關鍵的部份，付運期往往比施工期更長，而集團已預早簽訂了設備和工程的合約，因此整個項目在進度上最終的竣工時間跟原有計劃應不會有太大的差距。
  2. At the initial stage of planar technique, b was employed as ideal diffusion impurity in base - region of npn si planar devices because of the match of its solid - solubility and diffusion coefficient in si with those of p in emission - region, and the good shield effect of sio2 film to b. but because of the relatively large solubility ( 5 1020 / cm3 at 1000 ) and the small diffusion coefficient, the linear slowly - changed distribution of acceptor b in pn junction can not be formed, which could not cater to the requirement of high - reversal - voltage devics. thereafter b - a1 paste - layer diffusion technology and close - tube ga - diffusion technology had been developed, while the former can lead to relatively large the base - region deviation and abruptly varied region in si, which caused severe decentralization of current amplification parameter, bad thermal stability and high tr ; the latter needed the relatively difficult pack technique, with poor repeatability, high rejection ratio, and poor diffusion quality and productio n efficiency

    在平面工藝初期，由於b在硅中的固溶度、擴散系數與n型發射區的磷相匹配， sio _ 2對其又有良好的掩蔽作用，早被選為npn硅平面器件的理想基區擴散源，但b在硅中的固溶度大（ 1000時達到5 10 ~ （ 20 ） ，擴散系數小， b在硅中的雜質分佈不易形成pn結中雜質的線性緩變分佈，導致器件不能滿足高反壓的要求，隨之又出現了硼鋁塗層擴散工藝和閉管擴鎵工藝，前者會引起較大的基區偏差，雜質在硅內存在突變區域，導致放大系數分散嚴重，下降時間t _ f值較高，熱穩定性差；後者需要難度較大的真空封管技術，工藝重復性差，報廢率高，在擴散質量、生產效率諸方面均不能令人滿意。
  3. Geometrical and physical meanings of difference surface are presented, and the parameters of tooth surface topographic deviations are derived. in addition, the complete mathematical formulae of the 0th, the 1st, 2nd order form deviations is proposed, and diagnostic parameters of each order form deviation is gotten by the least square method, which lead to evaluate the tooth surface topographic deviation quantificationally

    系統地給出了差曲面的幾何意義和物理意義，提取了齒面拓撲誤差參數;給出了零階誤差、一階誤差、二階誤差的完整數學公式，並且用最小二乘法得到了各階誤差的特徵參數值，實現了對齒面拓撲誤差的定量評定。
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