When observing the Cu-Zn-Al alloy, which has been treated in mixed acid and etching reagent in normal temperature and pressure, a nanotube in novel structure and shape is found. It is a single-wall nanotube with smoot...When observing the Cu-Zn-Al alloy, which has been treated in mixed acid and etching reagent in normal temperature and pressure, a nanotube in novel structure and shape is found. It is a single-wall nanotube with smooth surface, on which there is basically no absorbate. It is verified through transmission electron microscope (TEM) that the dislocation lines are observed on the nanotube. Structural analysis reveals that the mechanics of nanotube generation is in relation to "quasi-fluid state" that exists in the alloy. The solid "quasi-fluid state" is the research result of Mr. Gao and his colleagues over ten years. It is a new material that exists besides gas, liquid, solid, and liquid crystal.展开更多
A class of large scale geophysical fluid flows are modelled by the quasi-geostrophic equation. An averaging principle for quasi-geostrophic motion under rapidly oscil-lating ( non-autonomous) forcing was obtained, bot...A class of large scale geophysical fluid flows are modelled by the quasi-geostrophic equation. An averaging principle for quasi-geostrophic motion under rapidly oscil-lating ( non-autonomous) forcing was obtained, both on finite but large time intervals and on the entire time axis. This includes comparison estimate, stability estimate, and convergence result between quasi-geostrophic motions and its averaged motions. Furthermore, the existence of almost periodic quasi-geostrophic motions and attractor convergence were also investigated.展开更多
文摘When observing the Cu-Zn-Al alloy, which has been treated in mixed acid and etching reagent in normal temperature and pressure, a nanotube in novel structure and shape is found. It is a single-wall nanotube with smooth surface, on which there is basically no absorbate. It is verified through transmission electron microscope (TEM) that the dislocation lines are observed on the nanotube. Structural analysis reveals that the mechanics of nanotube generation is in relation to "quasi-fluid state" that exists in the alloy. The solid "quasi-fluid state" is the research result of Mr. Gao and his colleagues over ten years. It is a new material that exists besides gas, liquid, solid, and liquid crystal.
文摘A class of large scale geophysical fluid flows are modelled by the quasi-geostrophic equation. An averaging principle for quasi-geostrophic motion under rapidly oscil-lating ( non-autonomous) forcing was obtained, both on finite but large time intervals and on the entire time axis. This includes comparison estimate, stability estimate, and convergence result between quasi-geostrophic motions and its averaged motions. Furthermore, the existence of almost periodic quasi-geostrophic motions and attractor convergence were also investigated.
