美国标准局1979年把25000美元的精密测量奖授给两个项目。一是普朗克常数与电子的静止质量比(h/m_e)),一足接近无摩擦力的机械旋转器。从1970年以来美国标准局的精密测量奖每年授予大学和科研机构从事高精密测量的专家。斯坦福大学利用已知截面超导环的宏观 In 1979, the United States Bureau of Standards awarded 25,000 U.S. dollars of precision measurement awards to two projects. One is the ratio of Planck’s constant to the electron’s resting mass (h / m_e)), a full-fledged mechanical rotator. Since 1970, the American Bureau of Standards precision measurement award to the University and research institutes annually engaged in high-precision measurement of experts. Stanford University uses the macroscopic cross section superconducting ring