[Study on bamboo treated with gamma rays by X-ray diffraction].

The microfibril angle and crystallinity of bamboo treated with gamma rays were tested by X-ray diffraction (XRD). The result indicated that crystallinity in bamboo increased when irradiation dose was less than 100 kGy, while the irradiation dose was raised to about 100 kGy, crystallinity in bamboo reduced. But during the whole irradiation process, the influence on microfibril angle was not obvious, so it was not the dominant factors on variation in physical-mechanical properties of bamboo during the process of irradiation.

Enhancing foam drainage using foam fractionation column with spiral internal for separation of sodium dodecyl sulfate.

A new type of foam fractionation column with spiral internal had been designed for enhancing the foam drainage and thus for the removal of minute hazardous materials. The column without spiral internal was served as the comparison column, and an anionic surfactant sodium dodecyl sulfate (SDS) was used as the foaming solution. Effects of liquid loading volume, initial SDS concentration and superficial gas velocity on enrichment ratio and recovery percentage of SDS were investigated.