(PhysOrg.com) -- Monochromatic light-emitting diodes cover a large part of the visible spectrum with high effi-ciency. For blue light, nitride diodes achieve external quantum efficiencies in excess of 65%, i. e., one photon ...
Condensed Matter
Jul 23, 2009
1
3
(PhysOrg.com) -- Ah, Paris. Land of the Eiffel Tower, delicious French bread and... tropical rainforests? Sacrebleu! It seems unlikely, but scientists have discovered evidence that France may have been a hot, wet tropical ...
Biochemistry
Jul 16, 2009
2
0
French and Chinese blue glass, Dutch layered glass, Baltic amber: roughly 70,000 beads manufactured all over the world have been excavated at one of the Spanish empire's remotest outposts, the Santa Catalina de Guale Mission. ...
Archaeology
Apr 9, 2009
0
0
