光学势在核中的吸收系数趋于零，因此弹性散射主要发生在核的表面。
The absorption coefficients approach to zero inside the target nucleus, so that the elastic scattering takes place at the surface region of nucleus.
物料加热表面受到对流冷却，并讨论了物料的吸收系数，折射率，导热系数，换热系数，物料表面辐射特性对温度场的影响。
The effects of absorption coefficient, refractive index, heat conductivity, convective heat-transfer coefficient and radiative properties of the surf ace on the temperature field are discussed too.
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