Eczema is a common skin problem that is also sometimes called atopic dermatitis. It usually affects babies and young children, but adults can develop it, too. This inflammatory skin condition is often believed to be an allergic reaction, but the cause is unknown.
The potential of each line of a three-phase system is displaced from the other two by 120 electrical degrees. The sequence, or order, in which the potential of each line reachâ¦es its peak value is termed the 'phase sequence' of the system.
Stages three and four: Deep Sleep. During stage three, the brain begins to produce delta waves, a type of wave that is large (high amplitude) and slow (low frequency). Breathing and heart rate are at their lowest levels. Stage four is characterised by rhythmic breathing and limited muscle activity.