The phase and the group velocity of light propagating in conventional optical media cannot exceed the speed of light in ...

In LED bulbs, light is produced almost directly by the movement of electrons jumping from one energy level to another in a process of ionization and excitation. But who knows what will replace ...

Chronic pain is a prevalent and debilitating condition whose neural mechanisms are incompletely understood. An imbalance of cerebral excitation and inhibition (E/I), particularly in the medial ...

Abstract: All-fiber photoacoustic (PA) excitation and detection system offers a promising candidate for Lamb wave-based structural health monitoring. However, relatively low sound pressure generated ...

There are two different types of smoke alarms—single-sensor ionization and single-sensor photoelectric units. They work differently in order to detect smoke. Ionization detectors use a very ...