In a metal like copper, however, the outer electrons swim around freely and are shared by all the atoms. That’s why ...

Every day, millions of people pass through walk-through metal detectors at airports, schools, concert venues, courthouses, and office buildings. A vast majority barely think twice about this process ...

Abstract: Terahertz (THz) waves are highly sensitive to humidity changes due to the strong absorption properties of water molecules in this electromagnetic range. Based on this, this letter proposes a ...