In a specific region of the brain, the cerebral cortex is thinner in smokers than in people who have never smoked. This has been found in a cooperation between researchers of the Charité – Universitätsmedizin Berlin and PTB. It has for some time been known that ...
Increasingly, Laser Doppler Anemometers (LDA) which are retraced by PTB are used by calibration laboratories, by test benches for air and gas flow rate, and by large test rigs for fluidic and calorimetric flow metering as a transfer standard for the measurement of flow velocity. The primary standard for the calibration of LDA systems – a precisely rotating glass disk – has now been subjected...
Für die Untersuchung der Molekulardynamik in Flüssigkeiten mit der Kernresonanzspektroskopie muss man die natürliche Breite der Resonanzlinien ermitteln. Hierfür wurde ein neues Verfahren entwickelt, das mit einer Helmholtzspule in Kombination mit einer Erdfeldkompensation auskommt. Mit diesem relativ geringen Aufwand wurde die Breite der Protonenresonanzlinie von Wasser von etwa einem Achtel...
Defekte wie Stufen und Korngrenzen können die Lebensdauer von Plasmonen in Graphen stark verkürzen. Dies zeigen Untersuchungen einer Forschungskooperation der PTB und der Leibniz Universität Hannover.
Präzisionsmessungen des elektrischen Widerstandes an Quanten-Hall-Widerständen aus der neuen Molekularstrahlepitaxie (MBE)- Anlage zeigen eine hervorragende Übereinstimmung mit dem besten Quanten-Hall-Normal aus der konventionellen MBE-Anlage. Für Quanten-Hall-Widerstände aus einer speziell für höchstbewegliche Materialien ausgelegten MBE-Anlage war dies nicht erwartet worden. Die PTB sichert sich...
The International X-ray Observatory (IXO) , a joint ESA/NASA/JAXA mission candidate, will be the largest X-ray telescope ever flown with an effective area of more than 2.5 m² at 1.25 keV, a focal length of 20 m and an angular resolution better than 5”. Due to the required grazing incidence angle, the mirror area is about 1300 m². A possible approach to realize this large area in a stiff and ...
The activity of Cd-113m was determined with two liquid scintillation counting methods with small uncertainties. By combining the procedure with measurement results from gamma spectrometry, the photon emission probability of the 264 keV transition could - for the first time - be exactly determined. The half-life of the isotope, too, was redetermined with improved uncertainty.
Due to the complexity of the problems, measuring and calculating require a solid knowledge base. Persons who already have a professional career often do not find the time to acquire the basics of this specific field in which their profession has "led" them. Thus, many engineers sooner or later discover that they have to do with acoustics without ever having learned it properly.
Die praktische Anwendung der Ultrahochfeld-Magnetresonanztomographie (UHF-MRT) auf kardiovaskuläre Fragestellungen wird durch eine Reihe von Problemen behindert. Hierzu zählen...
The National Institute of Standards and Technology/USA (NIST) has recently developed highly sensitive atomic micro magnetometers based on the technology of miniaturised atomic clocks. Such a magnetometer ...
Within the scope of a project funded by the DFG and carried out in cooperation with the TU Berlin (Prof. Orglmeister), a new method for the spatial separation of dependent source signals in MEG was developed in 2009. The method ...
The modelling of non linear evolution equations in spatially heterogenous systems is relevant for numerous biological systems, such as, e.g., the excitation spreading in the myocard. Within the scope of a project ...
Computer simulations have enabled the modelling and mathematical analysis of life-threatening cases of cardiac arrhythmia. Especially so-called T wave alternans, a period doubling ...
With regard to a decree of the Federal Ministry of Economics, it had become necessary to radically amend the technical directive for cash gaming machines. The revision, as well as the merging ...
Within the scope of the project INSIKA which is fostered by the BMWi, the development of a procedure has been completed by means of which measurement and POS (point-of-sale) data can be reliably checked by auditing entities. The procedure ...
In preparation of the implementation of the decision of the Federal Constitutional Court on voting machines, a comparative examination of known concepts of voting machines has been carried out. The results reveal ...
The joint research project on the development of micro-fabricated flow cytometers, co-financed by the Investitionsbank Berlin (IBB) and the European Regional Development Fund (EFRE), has been successfully completed. The results obtained in cooperation ...
For several years, PTB has participated in interlaboratory comparisons for cell counting in liquor. The aim of these experiments is to apply the measurement methods which are used for the reference value determination of erythrocyte and leukocyte concentrations within the scope of the complete blood count to cell counting in liquor. The concentrations of the leukocytes and erythrocytes ...
International X-ray Observatory (IXO)