Abstract This paper reports on the fabrication and characterization of high quality factor (Q) copper (Cu) inductors with thick insulator on standard silicon (Si) substrate (ρ = 10–20 cm). The thickness and the area of the insulating layer are optimized for high Q by fabricating inductors on very thick (∼50 μm) embedded silicon dioxide (SiO2) islands and 4–20 μm thick PECVD SiO2 coated standard...

Determining ages of stars for reconstructing the history Milky Way remains one most difficult tasks in astrophysics. This involves knowing when it is possible to relate stellar mass with its age and not. The young $\alpha-$rich (YAR) present such a case which we are still not sure about their because they relatively massive, implying ages, but abundances $\alpha-$enhanced, implies old ages. We ...