Using a special constant deflection device, the in situ TEM observations of dislocation emission, motion and the initiation of nanocrack in 310 stainless steel in water were carried out. The results show that SCC in t...Using a special constant deflection device, the in situ TEM observations of dislocation emission, motion and the initiation of nanocrack in 310 stainless steel in water were carried out. The results show that SCC in thin foil specimen of 310 stainless steel can occur in water. A nanocrack initiated in the DFZ or at the blunt crack tip in corrosion solution after dislocation emission, multiplication and motion, which were induced by the localized anodic dissolution, reached a critical condition. The nanocrack propagated by a cleavage mode because of the influence of the corrosion solution.展开更多
----(-)S-Ligustiphenol is a new sesquiterpene compound with antiinflammatory and immunosuppressive activities. The total synthesis of its racemate was carried out by a six-step reaction sequence including bromination ...----(-)S-Ligustiphenol is a new sesquiterpene compound with antiinflammatory and immunosuppressive activities. The total synthesis of its racemate was carried out by a six-step reaction sequence including bromination of aldehyde, iodination of m-cresol, protection of phenolic hydroxyl, Grignard reaction,aldol condensation, etc. The target compound was characterized by comparing its H-1 NMR,MS and IR spectra with natural (-) ligustiphenol.展开更多
文摘Using a special constant deflection device, the in situ TEM observations of dislocation emission, motion and the initiation of nanocrack in 310 stainless steel in water were carried out. The results show that SCC in thin foil specimen of 310 stainless steel can occur in water. A nanocrack initiated in the DFZ or at the blunt crack tip in corrosion solution after dislocation emission, multiplication and motion, which were induced by the localized anodic dissolution, reached a critical condition. The nanocrack propagated by a cleavage mode because of the influence of the corrosion solution.
文摘----(-)S-Ligustiphenol is a new sesquiterpene compound with antiinflammatory and immunosuppressive activities. The total synthesis of its racemate was carried out by a six-step reaction sequence including bromination of aldehyde, iodination of m-cresol, protection of phenolic hydroxyl, Grignard reaction,aldol condensation, etc. The target compound was characterized by comparing its H-1 NMR,MS and IR spectra with natural (-) ligustiphenol.
