surface diffusion coefficient 中文意思是什麼

surface diffusion coefficient 解釋
表面擴散系數
  • surface : n 1 表面；地面；水面；廣場，空地。2 外觀，外表，皮毛。3 【幾】面；切口；【航空】翼面。adj 表面的...
  • diffusion : n. 1. 散布，發散。2. 傳播，普及。3. 冗長。4. 【化學】滲濾。5. 【物理學】擴散，漫射。
  • coefficient : adj. 共同作用的。n. 1. 共同作用；協同因素。2. 【數，物】系數，率；程度。
  1. A transfer model is established, which can be used to study the interaction between the land surface physical processes of inhomogeneous region and the structure of atmosphere boundary - layer over urban and rural terrains. the model has simulated surface heat flux, surface temperature, temperature profiles, height of mixture layer and so on. and the differences between urban area, suburban area and rural area have been compared. this model mainly depends on the parameters below : surface albedo, surface roughness coefficient, moisture available coefficient of soil, thermal capacity and thermal diffusion coefficient of errain, cloudage. the result shows that this model can simulate the structure and eigenvalues of atmosphere boundary layer and their changes in a day. parameters used in this model aim at beijing city, and the time is at the beginning of september. to other cities, or other time, the parameters should be adjusted accordingly. in addition, being adjusted, the model can also be used for other homogeneous and inhomogeneous terrains

    模式主要依賴于以下參數和物理量：地面反照率下墊面粗糙度土壤的可含水量下墊面的熱容量和熱擴散系數雲量等參數。結果表明，本模式能合理地模擬不同地表熱量平衡地表氣溫混合層高度湍流交換系數湍流動能位溫廓線等，以及它們的日變化。該模式所取參數主要針對北京市，時間為九月初，對于其他城市，參數應作相應的調整。
  2. The effect of gas rates, liquid flow - rates, downcomer width, weir height and the addition of surface active agent on the liquid mean residence time, t, effective diffusion coefficient, de, and froth height, hf were studied. results obtained showed that for two systems, the t in the downcomer of ctst plate is 20 - 50 % smaller than that of fl valve plate, and the de is 40 - 70 % smaller than that of fl valve plate

    通過對氣速、液體流量、降液管寬度、堰高和表面活性劑加入的影響進行分析得出下面結論：在相同的操作條件下，對于兩種物系， ctst塔板降液管的液體停留時間比f1浮閥塔板的約小20 50 ，有效擴散系數比f1浮閥塔板的小40 70 ，泡沫高度低110 150mm 。
  3. 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。
  4. Many factors regarding the modifying coefficients of circular and rectangular section are analyzed : ( 1 ) it is theoretically proved that the diffusion coefficient of cl - in concrete is dependent of modifying coefficients ; ( 2 ) through analysis of the results of numerical value calculation, it is discovered that the relation between the modifying coefficients and the thickness of protection layer of concrete is linear, from which the function expression of these two variables is gain ; at the same time, the influence on modifying coefficient of the radius of circular section and the thickness of cl - on the surface of concrete ; based on these, practical calculating method of beginning corrosion time of steel of circular section is set up ; ( 3 ) to rectangular section, the diffusion of cf in concrete is two - dimension diffusion

    討論了影響矩形截面以及圓形截面修正系數的因素： （ 1 ）從理論上證明了氯離子在混凝土中的擴散系數與修正系數無關； （ 2 ）通過圓形截面數值計算結果的分析，發現圓形截面修正系數與保護層厚度基本成線性關系，並建立了二者之間的聯系；分析了圓形截面半徑、混凝土表面氯離子濃度對修正系數的影響，從而建立了圓形截面鋼筋初始銹蝕時間的實用計算方法； （ 3 ）在矩形截面氯離子侵蝕下，混凝土處於二維擴散狀態。本文通過計算分析，證明二維擴散的影響區域從邊角開始向中間逐步擴散，並證明了二維擴散影響區域依賴于氯離子擴散系數與氯離子擴散時間的乘積。
  5. On the basis of the theory of reinforcement corrosion caused by chloride, a chloride diffusion model considering the time - dependent quantities of diffusion coefficient and surface chloride concentration for predicting the content of chloride in concrete is presented in this paper, at the same time, the determination of model factors are analyzed

    論文以氯離子對混凝土結構的侵蝕機理為基礎，在不同氯腐蝕環境下，建立了考慮氯離子擴散系數的時間依賴性及其它因素影響的改進氯離子擴散模型，並對模型參數的選取和確定進行了深入討論。
  6. Abstract : the average diffusion coefficient of carbon in surface layer of steel 20 rare ea rth carburized at 880 and 900 for 8 h was calculated by substituting the mea sured layer depths into the diffusion equation

    文摘:通過對20鋼常規氣體滲碳和稀土滲碳層深的測定，計算出稀土滲碳時碳在奧氏體中的平均擴散系數。
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