Free-flow tunnel used more round arch straight wall form cross-section.
无压隧洞多采用圆拱直墙形断面。
2
The deformation characteristics of non free cutting (NFC) are experimentally studied with the chip crosssection geometry, the deformation configuration and the cutting ratio.
通过对切屑截面几何、变形状态及切削比的实验分析，研究了非自由切削的变形特征。
3
An electronic stopping crosssection formula for heavy ions at low yelocity is obtained within the uniform free electron gass model and perturbation limit.