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In addition to Ampere, Kelvin, Mol and Co., the kilogram also is now defined by a natural constant. In concrete terms, this means that the original kilogram, which has been the measure of all things for 130 years, has now served its purpose in Paris. This is made possible by the single crystals grow more
If you come across someone who can tell you by heart and without cheating what a kilogram is after 20 May 2019, beware! It is probably a particular kind of scientist, a metrologist, who is still overly enthusiastic about the fundamental change experienced by the International System of Units, the SI more
Understanding the dynamics of quantum-mechanical systems on their natural time scale is the main goal in attosecond science. Among the most interesting systems to investigate are molecules, which have a very high degree of complexity, in particular when compared to atomic systems. So far, the few at more
During the last several years, Mettler-Toledo has been privileged to participate in several strategic partnerships that have contributed to the newly established and highly stable kilogram definition. This video explains the background of the 1 kg redefinition and the effect this change will hav ... more
A new definition of the kilogram was necessary, in order to ensure the measurement unit is independent from a physical object. more
Entropy, Vol. 20, Pages 494: SIP-Based Single Neuron Stochastic Predictive Control for Non-Gaussian Networked Control Systems with Uncertain Metrology Delays Entropy doi: 10.3390/e20070494 Authors: Xinying Xu Yalan Zhao Mifeng Ren Lan Cheng Mingyue Gong In this paper, a novel more
Attosecond metrology of atoms has accessed the time scale of the most fundamental processes in quantum mechanics. Transferring the time-resolved photoelectric effect from atoms to molecules considerably increases experimental and theoretical challenges. Here we show that orientation- and energy-res more
Sensors, Vol. 18, Pages 1734: Reader Architectures for Wireless Surface Acoustic Wave Sensors Sensors doi: 10.3390/s18061734 Authors: Fabian Lurz Thomas Ostertag Benedict Scheiner Robert Weigel Alexander Koelpin Wireless surface acoustic wave (SAW) sensors have some unique fea more
It is now more than 30 years since attempts started to find a way of defining the kilogram based on an atomic constant or a fundamental physical constant. Since then, two methods have advanced sufficiently far to make it likely that there will be a new definition within the coming years, namely the Watt balance experiment for determination of Planck‘s constant h and the Avogadro experiment for determining the Avogadro Constant NA. more
The 20th of May 2019 is a special day. From that day on, the old definitions of what a kilogram, a mole, an ampere and a kelvin represent, are history. The future of the International System of Units will see natural constants play the star roles. more
For about 200 years, any mass given in kilograms, grams and micrograms referred to a defined artifact accessible in only a single location on earth. A small metal cylinder had represented one kilogram since the metric system was introduced in France. Its successor became world famous as the “International Prototype of the Kilogram” (IPK). more
studied physics at the University of Münster and received his doctorate in 1974 from the Institut für Physik der Universität Dortmund (Dortmund University Institute of Physics). From there he moved to Physikalisch-Technischen Bundesanstalt (National Metrology Institute) in Braunschweig (Brunswick). more
Horst Bettin, born in 1955, studied physics at the Technical University of Braunschweig where he completed his PhD at the Institute for Semiconductor Physics and Optics. In 1990 he joined the Physikalisch-Technische Bundesanstalt and focused his research mainly on density measurements. He has also b more
Martina Hedrich studied chemistry at Freie Universität Berlin (FUB), where she also received her doctorate in inorganic chemistry in the field of X-ray structure analysis. During her postdoc at the Hahn Meitner Institute in Berlin, she dedicated her work to trace analysis in human tissue samples bef more
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