Chitosan-TiO2 composite has been prepared by the sol-gel process. Tetrabutyl titanate( TTB) was used as a precursor to obtain nano TiO2 sol,which was then added
In practical engineering,sometimes the probability density functions( PDFs) of stress and strength can not be exactly determined,or only limited experiment data
Three monitor models of enterprise crisis were introduced,i.e.,the monitoring model of enterprise crisis based on intelligent Meta search,the enterprise crisis