With the secondary duplicated model structure with high magnification, the surface grain structure of LF6 aluminum alloy superplastically deformed is observed.
2
采用复刚度法对某型直升机救生绞车支架进行表面阻尼处理的分析。
The complex stiffness method is adopted to carry out the analysis of surface damping treatment for the support of life winch of a certain typed helicopter.
The amphoteric surfactant was synthesized by sulfuric castor oil and ETA. The reaction condition of surfactant were deeply studied. The amphoteric fat liquor was recombinated with other surfactants.