Taking advantage of this time under the new leadership of the State Administration of Market Regulation (SAMR), NIM will bear the soul of metrology, the spirit of craftsmen, and the unity of knowledge and practice to work for better measurement and a better future. [...] This has greatly improved the clock’s stability, with its differential Figure 1 - NIM strontium optical lattice clock 1.2 China’s contribution to redefining the unit of temperature The accurate determination of the value of the gas thermometer (c-AGT) and the Johnson noise Boltzmann constant is key to the redefinition of thermometer (JNT). [...] 1.4 Joule balance for redefinition of the kilogram The kilogram, the unit of mass, is the last of the as NPL in the United Kingdom, NIST in the United seven SI base units still defined and realized by a States, METAS in Switzerland, LNE in France, as well material artefact: the International Prototype of as at BIPM. [...] NMIJ in Japan and NMIA in Australia used the One of the major disadvantages of this definition X-ray crystal density (XRCD) method to measure the is the fact that the amount of material constituting Avogadro constant, from which a value of the Planck the IPK has been shown by comparison with other constant can also be obtained. [...] The joule balance method replaces the moving phase of the Kibble balance For this and other reasons, the International with a flux linkage measurement phase, in which Committee for Weights and Measures (CIPM) has limitations of the dynamic measurement can be recommended the redefinition of the kilogram avoided.
- Pages
- 28
- Published in
- China
