The results show that a part of closedends of the tubes were broken and graphite layer of some nanotubes were tortured while ground for 8h.
实验结果显示球磨8小时后原碳纳米管的封闭端头被打开，并在纳米管壁上产生了扭曲变形的石墨层。
2
The present paper is concerned with a problem of limit analysis of thin cylindrical shell with closedends and different thicknesses under internal pressure.
本文研究充内压端封闭异厚度薄圆柱壳的极限分析问题。
3
Closedends are preferable because they allow a greater degree of squareness and prevent tangling. Grinding the ends permits greater squareness control and inhibits buckling.