In a scroll air compressor as a scroll fluid machine capable of being downsized with an increased cooling effect, cooling air entering through a fixed inlet of a fixed cooling passage provided at the rear of a fixed scroll, and an orbiting inlet of an orbiting cooling passage provided at the rear of an orbiting scroll, is allowed to flow out of an fixed outlet and an orbiting outlet, respectively. With this method, each set of message classes is associated with a state of an application, and each set of message classes is assigned to a semaphore. The piezoelectric film is formed of a relaxor material that has a perovskite type rhombohedral structure, and is preferentially oriented to pseudo cubic. The onboard data acquisition schedule is constructed to maximize the prediction accuracy of the decision models, which are designed to operate progressively, utilizing data representations consisting of multiple abstraction levels and multiple resolutions. The third antenna is a distance from the first antenna and from the second antenna such that, in air, the outbound signal is attenuated at the third antenna. A typical embodiment is 2-1–2-methylsulfonylethyl-4,5-diaminoisoindoline-1,3-dione.