BIPM holds every four year the ICAG (International Comparison of Absolute Gravimeters) which is always accompanied by a relative gravity campaign (Becker and Gr
The Noise Project in the Electromagnetics Division of the National Institute of Standards and Technology (NIST) has proposed the development of standards for mi
This paper briefly introduced the history of the development of the atomic frequency standards in China with the emphasis on the recent achievements. Here inclu