From Wikipedia, the free encyclopedia. A wafer, also called a slice or substrate, is a thin slice of semiconductor material, such as a crystalline silicon, used in electronics for the fabrication of integrated circuits and in photovoltaics for conventional, wafer-based solar cells.he boule is then sliced with a wafer saw (wire saw) and polished to form wafers. The size of wafers for photovoltaics is 100â200 mm square and the thickness is 200â300 Î¼m. In the future, 160 Î¼m will be the standard. Electronics use wafer sizes from 100â450 mm diameter.
Freebase(0.00 / 0 votes)Rate this definition: Glasgow Coma Scale. The Glasgow Coma Scale or GCS is a neurological scale that aims to give a reliable, objective way of recording the conscious state of a person for initial as well as subsequent assessment.
A coma is a state of unconsciousness where a person is unresponsive and cannot be woken. It can result from injury to the brain, such as a severe head injury or stroke.A coma can also be caused by severe alcohol poisoning or a brain infection (encephalitis) .People with diabetes could fall into a coma if their blood glucose levels suddenly became very low (hypoglycaemia) or very high (hyperglycaemia) .omeone who is in a coma is unconscious and has minimal brain activity. They're alive, but can't be woken up and show no signs of being aware. The person's eyes will be closed and they'll appear to be unresponsive to their environment.