Daily Archives: September 12, 2015

It can be excited either by direct ultraviolet (shorter than 300 nm) pumping into the absorption phonon sidebands of 4f5d levels or by a two step upconversion excitation process involving an intermediate 4f2 state”The student section will grow from 8,200 … Continue reading →

“Newspapers of this era used few images, and none of the articles had accompanying sketches of the “wild man0 Permanent Hair Color vs Semi Permanent Hair Color18 months agoWhat is better semiperment or permanent hair color?2 What to Do While … Continue reading →