Externally pressurized spherical air bearings are the key component of the three-axis air bearing table, and the manufacturing errors of the bearing affects the
The Great Wall Drilling Company (GWDC) of CNPC is a professional petroleum engineering and technology service company directly affiliated to China National Petr
The characterization of sub-micron features and particles between hard disk interface(HDI) is becoming even more important to the hard disk industry in the fie