［Objective］To evaluate the parameters of calcaneal quantitative ultrasound measurement of the Zang nationality on plateau above 3000 meter and find out the regularity of bone quantity change and influence of environment of plateau on it.
The influential regularity of drawing process on the structure and morphology of polyacrylonitrile (PAN) fiber was studied under different coagulation conditions with X-ray diffractometer, sonic velocity meter, density gradient tube and scanning electron microscope.