Timmerman and co-workers demonstrate SSQC within SiO 2 matrices containing both silicon nanocrystals (NCs) and erbium ions (Er 3+), and also within SiO 2 matrices containing only silicon NCs (ref ...

The property includes four archaeological sites located in the Diquís Delta in southern Costa Rica, which are considered unique examples of the complex social, economic and political systems of the ...