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A series of biodegradable amphiphilic graft polymers were successfully synthesized by grafting poly(glycolide) (PGA) sequences onto a water-soluble poly-α,β-[N-(2-hydroxyethyl)-L-aspartamide] (PHEA) backbone. These novel graft polymers were synthesized by the ring-opening polymerization initiated by the macroinitiator PHEA bearing hydroxyl groups without adding any catalyst. The graft polymers were...
Based on schematically formulation of the vibrations induced by moving trains, this paper analyses the waveforms along the Datong-Qinhuangdao railroad in Northern China recorded in the suburban Huairou district of Beijing on March 8, 2003. It is illustrated that vibrations induced by train, except traditional recognized noises and interference effects, could be used as a seismic source to detect crustal...
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