Combining seeral techniques enables researchers to measure the rate of diffusion of these helium gas molecules, which reflect the size of the air sacs in the lung. 聯(lián)合其他的儀器研究者能夠測量出氦氣分子的擴散率，這將反映出肺中肺泡的大小。
The application of laser technique in checking nanometer material is introduced,and amethod for checking the thermal diffusion rate of nanometer material is given. 介紹激光技術(shù)在檢測納米材料中的應用，給出了檢測納米材料熱擴散率的一種方法。
The impurity concentration profile depends on epitaxy growth velocity, growth time and impurity diffusion coefficient. 如果雜質(zhì)的擴散系數很小，雜質(zhì)在外延層中的深度分布是均勻的。
The effective diffusion coefficient and rate constant of intraparticle transport were calculated. 求出了顆粒內有效擴散系數和顆粒內擴散速率常數。
