The invention is a mechanical device that fixes a door in an open or partially open position, preventing the door from closing as a result of wind or incidental tugging. The system may include a gamma radiation source, a gamma detector and an image processor coupled to the gamma detector. Interlocking temporary upper guiderails are held in place by vertical rebar support rods. A depth of the sourcedrain structures is greater than the thickness of the top silicon layer and an upper surface of the sourcedrain structures coincides approximately with the transistor channel whereby vertical overlap between the sourcedrain structures and the gate is negligible. To stabilize the wavelength center of the output laser, at least a portion of the light having the second wavelength band may be transferred to a fiber Bragg Grating through a coupler. The surface electrode utilizes a disc or cone-shaped structure with a bore with a concave bottom surface for receiving a conductive gel and an insulated wire with a connector for an EEG.