After 10 years of successful operation, PTB's TraCIM service has been updated to a modern, customer-friendly platform that also allows future extensions in the field of AI algorithm testing.
For observation of aerosol properties, such as the essential climate variable aerosol optical depth (AOD), several measurement networks, such as AERONET, GAW-PFR and SKYNET, are established. The temperature coefficients of sun photometers from AERONET (AErosol Robotic NETwork) network are required to correct for varying ambient temperatures within the framework of the EMPIR project 19ENV04 MAPP...
Here we present a compact LED-based source designed within the framework of the EMPIR project 19 ENV04 MAPP “Metrology for aerosol optical properties” for monitoring responsivities of the AERONET Europe radiometers. The aim of the task was to design an LED source flangeable to an integrating sphere that would allow to track responsivity changes of the network instruments. For this purpose the...
The Nucleic Acid Working Group (NAWG) of the CCQM organised an international interlaboratory study called "fire drill". The aim of this pilot study is to prepare national metrology institutes for the next pandemic. This builds capacity for rapid development of standardised reference methods. The model chosen for this study is an influenza virus. The aim is to develop a reference method for...
Extracellular vesicles (EVs) are nanometer-sized cell-derived particles in body fluids and can be used as potential biomarkers for diseases such as cancer, inflammation and cardiovascular disease. EVs gained a lot of interest as they are released from all cell types and their biochemical composition, concentration and function are disease-dependent...
Ultra-high field MRI (UHF; ≥ 7 Tesla) unlocks superior resolution and contrast for studying the central nervous system (CNS) compared to lower field strengths. This makes 7-T-MRI highly valuable for investigating the spinal cord's role in neurological diseases. However, the spinal cord's thin, elongated shape and position within the spine present significant challenges for achieving high-quality...
Das ERC Projekt PowFEct hat einen bedeutenden Meilenstein in der Strömungsmesstechnik erreicht. Ein neu entwickeltes, patentiertes Messsystem ermöglicht es erstmals, die elektrostatische Ladung von turbulenten Strömungen unter Laborbedingungen räumlich aufzulösen. Bisherige Messmethoden waren lediglich in der Lage, die Gesamtladung zu messen, wodurch in turbulenten Strömungen zu geringe Ergebnisse...
Das Projekt mit einer Laufzeit von drei Jahren wird im Rahmen des 7. Energieforschungsprogramms durch das BMWK gefördert. Projektpartner sind die TU Braunschweig und die Physikalisch-Technische Bundesanstalt (PTB). Ziel des Projektes ist es, die Fähigkeit von umrichterbasierten Einspeiseanlagen messtechnisch zu untersuchen, um diese für netzdienliche Funktionen zur Stabilisierung des Stromnetzes...
Triply positive charged ions of the isotope Th-229 (Th3+) are of particular interest as the basis for a high-precision optical clock. As the isotope is radioactive, it is only available in very small quantities and conventional methods for realising an ion source (for example by vaporisation) are not applicable in this case. PTB has now developed an apparatus for generating, cooling and storing Th...
Optical properties of atmospheric aerosols, such as aerosol optical depth (AOD), are determined from solar radiation measurements using filter radiometers, known in such measurement applications as sun photometers. Here we present calibration of filter radiometers from the European branches of aerosol monitoring networks AERONET, GAW-PFR, and SKYNET with respect to their spectral irradiance...
A new EURAMET Traceability Project “Traceability of the GAW-PFR reference Precision Filter Radiometers to the SI” was started in collaboration between PTB, Working Group 4.11 “Spectroradiometry” and PMOD/WRC. PMOD/WRC is designated by the World Meteorological Organisation (WMO) to operate the World aerosol Optical depth Research and Calibration Center (WORCC). WORCC is responsible for hosting the...
Im Januar 2024 hat die Bibliothek in Berlin ihre neuen Räumlichkeiten im zweiten Obergeschoss des Anna-von-Helmholtz-Baus bezogen.
Dort befinden sich nun ein Teil des Medienbestandes an Büchern, Zeitschriften und Zeitungen sowie der Servicebereich und angenehme Arbeitsplätze in heller, freundlicher Atmosphäre.
Am "Tag der PTB-Bibliotheken" nutzten viele PTB-Mitarbeitende die Gelegenheit, die...
In diesem unterhaltsamen und informativen Video zeigen wir die Vorteile der Einführung von DCCs in unsere Arbeitsabläufe. Von der Reduzierung von Fehlern bis zur Steigerung der Effizienz bieten DCCs im XML-Format eine optimierte Lösung für die Dokumentation von Kalibrierungen.
Lithium-Ionen-Batterien sind wegen ihrer hohen Leistung und Lebensdauer weit verbreitet. Auch für Anwendungen in explosionsgefährdeten Bereichen besteht ein Bedarf, ältere Batterietechnologien durch Lithium-Ionen-Batterien abzulösen. Allerdings können Lithium-Ionen-Batterien unter bestimmten Bedingungen thermisch durchgehen. Dieser Fall ist sehr selten, führt aber zu hohen Drücken und...
The integrity and efficiency of file systems are important in many areas of PTB's work, e.g. in legal metrology. In collaboration with TU Dortmund [1] and TU Berlin [2], PTB has developed an innovative structure for file systems and applied for a patent. This efficient structure is particularly suitable for embedded systems. Patent DE 10 2016 110 479.5 (FLOUDS) became legally binding in March 2024...
In quantitative MRI imaging of the heart, one is often limited to two-dimensional parameter maps with large slice thicknesses due to the low signal-to-noise ratio together with cardiac motion. Simone Hufnagel and coworkers from PTB's Quantitative MRI group 8.13 have now developed a method that allows the acquisition of three-dimensional T1 maps of the entire heart –including the...
Feature importance methods promise to provide a ranking of features according to importance for a given classification task. A wide range of methods exist but their rankings often disagree and they are inherently difficult to evaluate due to a lack of ground truth beyond synthetic datasets. In a recent paper, PTB together with colleagues from NPL, IMBIH, King´s College, KIT, Fraunhofer HHI and...
Nach einer Laufzeit von fünf Jahren ging die Wirkungsstudie im Rahmen des Projekts „Kompetenzentwicklung zur Qualitätssicherung für den Export“ in Tunesien in Kooperation mit dem tunesischen Industrieministerium (Ministère de l’Industrie, des Mines et de l’Énergie) zu Ende.
Die Arbeitsgruppe 4.53 Solarmodule beteiligt sich im Rahmen eines DFG-Forschungsprojekts an der Untersuchung, wie die flächendeckende Installation von Photovoltaik (PV)-Anlagen das städtische Mikroklima im Freien und in Innenräumen hinsichtlich der thermischen Behaglichkeit der Einwohner und der Luftqualität beeinflusst. Projektleiter ist die Leibniz Universität Hannover und weiterer...
Die Arbeitsgruppe 4.53 Solarmodule beteiligt sich seit Dezember 2023 an einem europäischen Vorhaben zur Entwicklung von Standardisierungsmethoden für das Ökodesign und die Energieverbrauchskennzeichnung von Photovoltaikprodukten.
The Nucleic Acid Working Group (NAWG) of the CCQM organised an international interlaboratory study called "fire drill". The aim of this pilot study is to prepare national metrology institutes for the next pandemic. This builds capacity for rapid development of standardised reference methods. The model chosen for this study is an influenza virus. The aim is to develop a reference method for...
“Traceability of the GAW-PFR reference Precision Filter Radiometers to the SI”
![Figure 1: File system structure FLOUDS [4]](fileadmin/_processed_/csm_FLOUDS01_166e4a6b80.jpg "F L O U D S01")
