Study of the small-scale structures and material flows associated with solar quiescent filaments is very important for understanding the formation and equilibri
For a sample of metal-poor stars (-3.3≤[Fe/H]≤-2.2) that have high- resolution spectroscopic abundance determinations, we have measured equivalent widths of t
Accurate measurements of stellar metallicity gradients in the radial and vertical directions of the disk and their temporal variations provide important constra