One application might help build better electronics. Electronics manufacturers such as Nitronex Corporation, which donated the piezoelectric materials used in the study, make devices grown out of gallium nitride (GaN) and aluminum nitride (AlN), which are grown on a substrate and consist of layers of very thin films.
Chin(noun) the lower extremity of the face below the mouth; the point of the under jaw. Chin(noun) the exterior or under surface embraced between the branches of the lower jaw bone, in birds.
A double chin is defined as a roll of fatty skin that is situated beneath your chin that makes it appear as if you have two chins, hence the name, double chin. This can be caused as a part of the natural aging process, as well as a response to weight fluctuation. Also, once a double chin appears it may be difficult to get rid of due to the fact that the skin is stretched, which causes a loss of elasticity.