The present invention provides polyurethanes including a reaction product of components including: about 1 equivalent of at least one polyisocyanate; about 0. The resin on the joint portion of the can portion and the barrel portion can be cured at a high temperature under condition that the can portion and the barrel portion are sealed together. The relaxed silicon germanium region generates defects to getter impurities from the device region. The antenna has a dielectric layer, a first conductive layer, and a second conductive layer; the first conductive layer and the second conductive layer has the dielectric layer therebetween; the first conductive layer serves as a radiating electrode; and the second electrode serves as a ground contact body. The control unit is designed to stop the working movement of the machine part depending on a signal produced by the camera unit.