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345 results:
161. Mass determination of two new 28Si spheres in vacuum in preparation of the redefinition of the kilogram  
Date: 01.11.2017
Percental score: 4 %
A relative standard uncertainty (k = 1) of 6.1 × 10−9 was achieved for the mass determination in vacuum of two silicon spheres manufactured from a new 28Si crystal. The measurements  
162. The half-life of Se-79  
Date: 13.07.2010
Percental score: 4 %
Within the scope of a cooperation of several institutes, the half-life of the long-lived isotope Se-79 could be determined with a clearly improved uncertainty. PTB has contributed in particular by  
163. Foreword  
Date: 12.05.2022
Percental score: 4 %
“Providing a national measurement infrastructure in Germany to industry, society and science that is internationally of the very highest order.” This has been PTB’s central aspiration for 130  
164. Foreword  
Date: 12.05.2022
Percental score: 4 %
“Providing a national measurement infrastructure in Germany to industry, society and science that is internationally of the very highest order.” This has been PTB’s central aspiration for 130  
165. Alanine dosimetry - from metrology to therapy?  
Date: 09.08.2007
Percental score: 4 %
A commercial, compact ESR spectrometer intended for use in industrial alanine dosimetry was investigated with respect to its possible use in radiation therapy dosimetry. If data analysis procedures  
166. Neutron monitor AGREM – test measurements in pulsed radiation fields  
Date: 31.10.2014
Percental score: 4 %
The neutron monitor AGREM, developed at PTB, has been tested in different pulsed radiation fields and compared with other neutron monitors. Whereas commercial monitors exhibited a saturation  
167. 4.23 Optical Nanometrology  
Date: 20.01.2021
Percental score: 4 %
Overview on standards for nanometrology   http://www.nanoscale.ptb.de/nanoscale/nanoscale-standards.html http://www.nano-refmat.bam.de/en/ Linewidth calibrations on photomasks are offered  
168. Annex to PTB's Organization Chart  
Date: 13.01.2023
Percental score: 4 %
Annex to PTB's Organization Chart ANNEX to Organization Chart of PTB Internal Structure of the Presidential Staff Office Presidential Staff Office WG PSt2 Central Quality Management1 Dr. M.  
169. rng vgl final  
Date: 21.02.2012
Percental score: 4 %
rng vgl final Ringvergleich: Optische Strahlungsleistung 1/5 Abschlussbericht zum Ringvergleich Optische Strahlungsleistung in der optischen Nachrichtentechnik Stefan Kück, AG 4.54,  
170. Helmholtz Prize for the "new" ampere  
Date: 31.03.2014
Percental score: 4 %
[ptb/es] Quantum standards for the electrical units the volt and the ohm have been available for more than two decades. However, for the electrical base unit of the international system of units  
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