Researchers report their insights on the emerging field of complex frequencies excitations, a recently introduced scheme to control light, sound and other wave phenomena beyond conventional limits.

Alain Bourdillon is a professor of Electrical Engineering at the University de Rennes. He is involved in research on Over The Horizon radar and on radio propagation. Direct frequency synthesizers have ...

To identify the different patterns exhibited by volcano seismic waves by sketching the wave patterns. To describe how each wave pattern may be used to predict an eruption. To recognize that complex ...