Abstract: A strain, crack and acoustic emission conformal structural health monitoring circuit with integral preprocessor and provisions for connectorization to a central processing system includes a strain gauge (11) having crack sensing traces (21), (23), and (25) sandwiched between a bottom layer (13) and a top layer (39). Strain gauge (11) is attached to an aircraft structural surface (51) to be monitored. Successive alternating layers of interconnecting sheet layers (61) and dielectric layers (63) joined by successive layers of non-structural adhesive (65) are added sufficient to effectively attenuate any stress forces, and forces directly from the strain and cracks, from traveling upward from the aircraft structural surface (51).

Abstract: A sheet separation device is disclosed for use in a printing press to facilitate the removal of individual paper sheets from a stack to receive printing. The device is employed in cooperation with a supported stack of paper and a contiguous apparatus for lifting sheets from the stack, as for delivery to a printing station. The sheet separation device includes a bracket affixed to the paper supporting structure and defining an elongated spring chamber which extends parallel to the surface of paper in the stack. A torsion or coil spring is affixed to dwell in the spring chamber. A tab is affixed to the spring and incorporates a flat section which extends parallel to the sheets in the stack of paper. The spring-mounted tab permits the withdrawal of a single sheet from the stack, however, impedes the withdrawal of more than one sheet at a time.