Abstract: A server device includes a learning circuitry configured to determine constraint information that is used when a control program for taking measures against a failure of a system that includes devices is selected, on the basis of first system configuration information that includes version information of a current control program of each of the devices included in the system and device identification information for identifying each of the devices, and failure information of the system, and an update control program output circuitry configured to output a control program for controlling a device whose current control program is to be updated among the devices included in the system, on the basis of the constraint information, which is used when a control program for taking measures against a failure of the system is selected, and, which is determined by the learning circuitry.

Abstract: A thermoacoustic device includes a loop tube in which a working gas is sealed; a stack in which a temperature gradient is generated in a tube axis direction of the loop tube, the stack being provided in the loop tube; and a diaphragm structure including a diaphragm provided in the loop tube and an operation unit, the diaphragm having a surface extending in a direction intersecting the tube axis direction and being configured to vibrate with a component of vibration in the tube axis direction, and the operation unit being configured to apply a physical quantity that is required, to the diaphragm to change a rigidity of the diaphragm in the tube axis direction.

Abstract: A thermoacoustic device includes a loop tube in which a working gas is sealed; a stack in which a temperature gradient is generated in a tube axis direction of the loop tube, the stack being provided in the loop tube; and a diaphragm structure including a diaphragm provided in the loop tube and an operating unit, the diaphragm having a surface extending in a direction intersecting the tube axis direction and being configured to vibrate with a component of vibration in the tube axis direction, and the operation unit being configured to apply a physical quantity that is required, to the diaphragm to change a rigidity of the diaphragm in the tube axis direction.