A certain degree of free fibrillar structure was observed on the fiber surface due to the sheath structure of the fiber subjected to the greater drawing and orientation.
纺丝过程中纤维皮层结构受到更大的拉伸取向作用，并在纤维表面出现一定游离原纤化结构。
2
Based on the rf (radio frequency) sheath model, the equation for ion momentum when reaching the material surface was derived.
利用射频鞘层模型，推出了离子到达被加工材料表面时的动量的表达式。
3
The hair shaft and inner root sheath move together as the hair grows toward the surface: the outer root sheath remains fixed in position.