今传王弼本《老子》分篇分章源流考

《老子》书大致从战国晚期就开始以道经为上篇、德经为下篇,到王弼为《老子》作注时,《老子》的篇次和章句划分应该初步稳定。唐陆德明采用王弼注为《老子》作音义,并以道、德作为上、下篇题,以后又经历了长时期的流传变化,至明代后期或清代,今传王弼本的篇章结构逐渐固定下来。     

On the stability of 𝛃-SiC with respect to chemical disorder induced by irradiation with energetic particles

X-ray diffraction measurements of changes in the long-range structural orderof 𝛃-SiC thin films have been performed during irradiation with energetic ions atlow temperature. The decrease in both the chemical and the topological order wasanalysed in situ using the superstructure (002) and the fundamental (004)reflections of the zincblende-type structure, in a dose range up to completeamorphization. The data indicate that the crystalline-to-amorphous transitionis a continuous process rather than a sudden collapse of a defective crystalstructure and that, in contrast with previous assumptions, 𝛃-SiC remains stablewith respect to amorphization up to a high degree of chemical disorder.