Last fall, the research paper "Wirelessly interfacing sensor-equipped implants and MR scanners for improved safety and imaging" by Berk Silemek, Lukas Winter, and colleagues was published in Magnetic Resonance in Medicine (MRM). This article was now chosen as an MRM Highlights Pick"… because they openly shared design files and software for the MRI implant sensor they developed" (see gitlab1.ptb...
Single photon emitters in hexagonal boron nitride have gathered a lot of attention due to their favourable emission properties and the manifold of possible applications. Despite extensive scientic effort, the exact atomic origin of these emitters has remained unkown thus far. Recently, several studies have tied the emission in the yellow spectral region to carbon-related defects, but the exact atomic...
The optical constants fully describe how a material transmits, reflects, absorbs, refracts or scatters light. Their precise knowledge is therefore of central importance for optical technology. As part of the European joint projects "Advanced Traceable Metrology for Optical Constants" (ATMOC) and "14 Angstrom CMOS IC technology" (14ACMOS), PTB has started to build up a database of optical constants...
The standards of the PTB and of the Bureau International des Poids et Mesures (BIPM) for the measurand Reference Air Kerma Rate (RAKR) for Iridium-192 high-dose-rate brachytherapy sources (HDR) were...
The article "A reduced self-calibrating method for rotary table error motions" published in Measurement Science and Technology was awarded the "Outstanding Paper Award 2023" by IOP Publishing in the field of precision measurement.
We are pleased to announce the release of the revised edition of the Technical Regulations booklet, a valuable resource for regulators and policymakers working towards implementing improved regulatory processes. This updated version aims to address the challenges of developing and enforcing technical regulations in an ever-evolving global landscape.
The QuISP Alumni Network successfully conducted a highly anticipated kick-off webinar on 11 December 2023. Alumni from various courses and countries joined the virtual event, marking a significant step towards the reactivation of the network.
In a cooperation project between the PTB departments “Detector Radiometry and Radiation Thermometry” and “International Cooperation”, the Federal Association for Wholesale, Foreign Trade and Services (BGA) and the Business Scout for Development programme of the Federal Ministry for Economic Cooperation and Development (BMZ), a simple but effective cooling effect was demonstrated on buildings in...
Die PTB-Bibliothek setzt ihre Unterstützung der Open-Access-Transformation durch den erneuten Abschluss der DEAL-Verträge mit den Verlagen Springer Nature und Wiley fort.
Die vom DEAL-Konsortium ausgehandelten Vertragskonditionen beinhalten sowohl den lesenden Zugriff auf das Zeitschriftenportfolio der beiden Verlage als auch die zentrale Abrechnung der Publikationskosten.
Mithilfe von kurzwelliger und energiereicher UVC-Strahlung werden schon seit Jahrzehnten Oberflächen, Trinkwasser oder Raumluft desinfiziert. Dabei nutzt man aus, dass diese Strahlung Zellen schädigen kann – insbesondere diejenigen von Viren, Bakterien oder anderen Mikroorganismen. Allerdings kann sie auch Zellen in menschlichen Organen wie Haut und Auge schädigen. Die radiometrische Kalibrierung...
An independent international group of researchers from academics and national agencies formed a dedicated task group within the American Association of Physicists in Medicine to identify key image quality characteristics and objective test methods for macroscopic fluorescence-guided surgery (FGS). The minimum set of measurements considered important for basic device performance are image sharpness,...
Sebastian Dietrich-Conzelmann successfully defended his PhD thesis "Quantitative MRI for assessment of myocardial fat infiltration at ultra-high field strength" at the Faculty V – Mechanical Engineering and Transport Systems, Chair of Medical Engineering, of the Technical University Berlin. His work at PTB was supervised by Sebastian Schmitter, Head of PTB's Ultrahigh Field MRI Group 8.14....
The Bayesian approach to solving inverse problems strongly depends on the choice of a prior. Usually, a prior is constructed from expert knowledge or known physical constraints in a probabilistic fashion. A modern alternative to formulate such expert knowledge are generative models, a popular tool in machine learning to generate data whose properties closely resemble a given database by an...
Impedanzmessbrücken basierend auf Josephson-Spannungsnormalen vereinen die Flexibilität automatisierter „digitaler“ Messbrücken mit der ungeschlagenen Genauigkeit klassischer Impedanzmessbrücken basierend auf induktiven Spannungsteilern. Nun stellt sich die Frage: Wie überprüft man die Leistungsgrenzen einer Josephson-Impedanzmessbrücke, welche die Möglichkeiten klassischer Messbrücken übertrifft?
Der Wirkungsgrad von Windenergieanlagen (WEA) ist ein entscheidender Faktor für ihre Eignung als saubere und zuverlässige Quelle elektrischer Energie. Um den Wirkungsgrad von WEA mit vertretbarem Aufwand und geringer Messunsicherheit bestimmen zu können, sind standardisierte und von den Anwendern allgemein akzeptierte Messmethoden, die auf nationalen und internationalen Standards basieren, von...
Reconstructing the spatial electron density of atomic systems not only provides new insights into quantum mechanics, but also advances in areas such as material science and functional surfaces. In the photoelectric effect, photoelectrons are emitted through interaction with light...
At the Faculty of Natural Sciences of the Otto von Guericke University Magdeburg, Johannes Petzold successfully defended his PhD thesis "On radio-frequency implant safety in parallel transmission MRI" and was awarded the German counterpart of the PhD, the "Dr. rer. nat." His work at PTB was supervised by Frank Seifert, head of the MR Technology Group 8.11. Doctoral supervisor at OVGU Magdeburg...
Der XXIV. IMEKO-Weltkongress 2024 organisiert von einem versierten Team der PTB, findet von Montag, 26. bis Donnerstag, 29. August 2024 im CCH – Congress Center Hamburg statt. Am Freitag, 30. August sind in der PTB-Braunschweig Laborbesuche geplant.
Empowering Green Transformation
