Application of permanent magnet materials for microwave absorbers in the GHz range; Behavior of balls in a standard ball reducer (Ball center locus, ball passage period, and ball orbital period); Characterization and comparison of the dynamic properties of conventional and electro-rheological fluid shock absorbers;Complex permeability spectra of polycrystalline Li-Zn ferrites; Correct analysis of Gircs-Toumois absorbing intcrfcromctcr by the method of single expression; Damping Control of Liquid Container by a Carrier with Dual Swing Type Active Vibration Reducer - Active Damping Control using an Optimal Servo System