题目：The upcoming revision of the International System of Units (SI)
Dr. Michael Krystek studied Physics and Mathematics at the Technical University Berlin (Germany). He got a diploma in Physics and a Dr. of natural sciences from that university. After his graduation he was professor assistant and lecturer for theoretical solid state physics at the Technical University Berlin. Since 1979 he is working at the Physikalisch-Technische Bundesanstalt (PTB), the German national metrology and research institute, first at the Optics division and since 1990 at the Precision Engineering division. Currently he is Senior Scientist for “Mathematical methods in Precision Engineering” at the Precision Engineering division of PTB. He is member of the mathematics and the measurement uncertainty groups of PTB. He is expert in the ISO/TC 213 “Geometrical Product Specification and –verification”, member of the ASME Consensus committee B89 “Dimensional Metrology” (USA), chairman of the DIN working group “Surface Metrology” (Germany) and chairman of the ASME division B89.6 “Environment”. He has been visiting professor at the College of Mechanical Engineering and Applied Electronics Technology of the Beijing University of Technology (BJUT). He was co-author of several teaching books in Physics, has given about 100 conference papers and published more than 120 papers in Physics and Engineering.
Of the seven base units of the SI, only the kilogram is still defined in terms of a material artefact, namely, the international prototype of the kilogram. The current definitions of the ampere, mole and candela depend on the kilogram. During the last several decades the NMIs as well as the BIPM made significant efforts to prepare for the possibility that SI base units can be defined in terms of fundamental physical constants. Consequently, the CGPM on its last meeting in 2014 encouraged the CIPM to continue developing a plan for a revision of the SI that links the definitions of the kilogram, ampere, kelvin, and mole to exact numerical values of the Planck constant h, elementary charge e, Boltzmann constant k, and Avogadro constant N_A, respectively, and to complete all work necessary for the CGPM at its next meeting to adopt a resolution to replace the current SI with a revised SI. The lecture will give an overview of the changes which will take place in a revised SI, its consequences, as well as some background information of its implementation.