Dynamic model of a deep-groove ball bearing including localized and distributed defects. Part 1: theory;Dynamics of magnetic fluid support grinding of Si{sub}3N{sub}4 ceramic balls for ultraprecision bearings and its importance in spherical surface generation;Early Detection of Abnormalities in Ball Bearings Using an Ultrasonic Technique; Effect of Lubricating Oils on Cage Failure of Ball Bearings