In survey of this phenomenon, using spot date, physical and mathematics stimulant method, flowage and diffusion are studied and wellbore flow and air diffusion model of CO are established.
针对这一现象，运用现场数据以及物理模拟和数学模拟方法首次通过对CO气体流动、扩散等的综合研究，建立了CO井筒流动及大气扩散模型。
A mathematical model of fume diffusion in welding process was founded by considering welding arc as a spot source of generating fume and supplying the turbulent diffusion theory.
把焊接电弧作为一个发尘点源，应用大气湍流扩散理论，建立了焊接过程中烟尘扩散的数学模型。
This paper discusses the source of heat for spot welding and the theory of diffusion welding of brass and red copper.
探讨了点焊热量的来源和黄铜与紫铜的扩散焊机理。
Their changes in form were typically damages of ink-spot diffusion and non-typical seepage, which were distinguished from those who were under 45 years old(P< 0.01).
形态改变以墨渍弥散型和不典型渗漏多见，与45岁以下患者相比有显著差异（P<0.01）。
Their changes in form were typically damages of ink-spot diffusion and non-typical seepage, which were distinguished from those who were under 45 years old(P< 0.01).
形态改变以墨渍弥散型和不典型渗漏多见，与45岁以下患者相比有显著差异（P<0.01）。
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