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During femtosecond laser fabrication, photons are mainly absorbed by electrons, and the subsequent energy transfer from electrons to ions is of picosecond order. Hence, lattice motion is negligible ...

We independently review everything we recommend. When you buy through our links, we may earn a commission. Learn more› By Nancy Redd Shifts in the number of daylight hours — due to changing seasons or ...

ONDCP leads and coordinates the nation’s drug policy so that it improves the health and lives of the American people. ONDCP is responsible for the development and implementation of the National Drug ...