表面擴散系數英文怎麼說

表面擴散系數 的英文翻譯

表面擴散系數 例句

1. The third model was designed to investigate atom diffusion at contacting point. fe was sintered at 500, 550 > 600, 650 > 700 under bpec and radiation heating. the test results of image processing indicated that the average pore size took on wavelike with temperature under bpec heating
   脈沖大電流加熱條件下，其它條件相同時，分別在800 、 900的溫度武漢理土大學碩士學位論文下 擴 散 連接cu絲和ni絲，結果 表 明接觸線處cu和ni的 擴 散 系 數 隨溫度的升高而增大。
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. Water cement ratio and mixing fly ash or slag into concrete effect on ability of resisting chloride penetrating that are considered in the model. the effect of environment that include temperature, relative humidity and cumulating of surface chloride concentration of concrete are also considered. moreover, chloride diffusion changing with time is included in this model as well as
   模型中考慮水灰比和混凝土配合比（摻入不同量的粉煤灰和礦渣）變化對混凝土抵抗氯離子侵蝕能力的影響，同時考慮溫度、相對濕度和 表 面 氯離子濃度累積變化等環境因素對氯離子侵入混凝土過程的影響，以及氯離子 擴 散 系 數 隨時間的變化。
4. Thus, the conclusion is drawn : when the diffusion coefficient of cf is invariable and the diffusion time is under a certain range, the beginning corrosion time of the steel in the corner of the rectangular section is independent of the size of rectangular section ; ( 4 ) through the numerical value calculation of rectangular section, the law is found of the influence on modifying coefficient of rectangular section of the thickness of protection layer of concrete and diameter of the steel and the thickness of cf on the surface of concrete, based on which practical calculating method of beginning corrosion time of the steel in the corner of rectangular section is set up
   從而得到結論：在氯離子 擴 散 系 數 一定的情況下，在一定時間范圍內，矩形截 面 邊角區域鋼筋的初始銹蝕時間不依賴于矩形截 面 的截 面 尺寸； （ 4 ）通過矩形截 面 邊角區域鋼筋初始銹蝕時間的計算，分析了保護層厚度、鋼筋直徑、混凝土 表 面 氯離子濃度對修正 系 數 的影響，並在此基礎上建立了氯離子侵蝕下矩形截 面 邊角區域鋼筋初始銹蝕時間的實用計算方法。
5. Conclusions ? in vivo dt - mri of postinfarct myocardium revealed a significant increase in trace adc and a decrease in fa, indicating altered tissue integrity
   結論：梗死後活體內心肌dt - mri顯示微 表面擴散系數 明顯增加而分次各向異性減弱，提示組織完整性發生改變。

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