The technique of manufacturing PAS by gelation from aluminium sulphate was studied.
介绍了以硫酸铝为原料，采用凝胶法制备聚合硫酸铝（PAS）的工艺技术条件。
Photoacoustic spectroscopy (PAS) is a new technique to study optical properties of rare earth pigments and glazed tiles, which are non-transparent, highly reflective and scattering.
光声光谱适于研究不透明、高反射、高散射的稀土色剂和釉瓷的光学性质。
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