通知公告
学术报告会(3月6日)
发布时间:2019-03-01 

时间:2019年3月6日14:00-16:45

地点:陈瑞球楼308

报告题目:Towards a historic revision of the International System of Units (SI)

Michael Krystek,自然科学博士,1976年毕业于柏林理工大学,专业为物理和数学。

2015年退休前,为德国联邦物理研究院(PTB)高级科学家,退休后原单位返聘继续从事科研工作至今。

在德国、美国,以及一些国际科研机构的其他曾任职和现任职主要有:

2003年-2015,国际测量和仪器委员会(ICMI)理事。

2007年-2014年,美国机械工程师协会(ASME)B89.6 工作组负责人,主持机械技术的环境相关性研究。

2007年-2015年,ASME B89空间计量委员会常务理事。

2013年-2018年,国际标准化组织(ISO)ISO/TC 12质量和单位委员会委员,ISO/TC 12/WG 19 "ISO 80000标准修订-全章"工作组负责人。

2016年-2017年,在国际计量局(BIPM)"标准单位顾问委员会(CCU)"中,出任国际电工委员会(IEC)和 国际标准化组织(ISO)代表委员。

目前任职:

ASME B89空间计量委员会荣誉委员;IEC/TC 25质量和单位委员会负责人;IEC BIPM-JCGM “国际计量词汇工作小组(VIM)” 的 IEC 常任代表;BIPM-JCGM “测量的不确定性符号工作小组(GUM)”的 ISO代表;国际理论和应用物理联合会(IUPAP) “符号, 单位, 术语规范, 原子质量, 基本常数”委员会委员;德国标准化学会(DIN)单位和公式量值技术委员会主席;DIN 技术基础顾问委员会委员。

内容简介:

On 20 May 1875 the Metre Convention was signed in Paris by representatives of 17 nations, establishing the metric system. Based on it the International System of Units, the SI, was subsequently introduced in 1960. Since that time, several improvements of the SI have taken place. However, 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 (IPK). The fact that the current SI definitions of the ampere, mole and candela depend on the kilogram is little known, but has consequences, especially for precise electrical measurements.

During the last several decades the National Metrology Institutes (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, in 2014 the CGPM encouraged the CIPM to develop 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 to adopt a resolution to replace the current SI with a revised SI. This decision has been made on November 2018 by the CGPM. The revised SI will become in force at the World Metrology Day on May 20th 2019.

The presentation will give an overview of the changes which will take place in the revised SI, its consequences, as well as some background information of the implementation of the unit of mass by the two currently agreed methods based on the Planck constant or alernatively on the Avogadro constant.

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