A resonator is provided, having an adaptable resonator frequency for absorbing sound generated by a gas stream of a gas turbine. The conveying mechanism is configured to convey the sheet along a common path to the scanning position in a first direction, and to discharge the sheet having passed the scanning position selectively along a return path in a second direction and along a one-way path in the first direction. The program storage device and the goods information storage device serve to store data in a non-volatile storage device. An elongate pawl piece is received in the groove and a first spring is located between the pawl piece and an inner surface of the recess. The method includes the steps of performing an offline analysis of an electrical transmission network to partition generators into a number of coherent groups, performing online monitoring of the transmission network to determine a separation interface and frequencies and damping ratios of dominant inter-area modes, and estimating the risk of system separation to perform real-time control. , silicon, silicon on insulator, epitaxial silicon.