Transfer standard uncertainty can cause inconclusive inter-laboratory comparisons

Validating Uncertainty Analyses for Gas Flow Standards via Intra- and Inter-laboratory Comparisons

The Fluid Flow Group (FFG) at NESTmaintains flow standards to perform calibrations of gas flowmeters over the 3.7x 10-2L/rein@to 78,000 L/rein flow range. Uncertainty analyses based on the propagation of uncertainties method show that the uncertainties of the provers range from O.16’%o to O.19’?40. The results of inter-laboratory comparisons and intra-laboratory comparisons (i.e., “crossover te...

Inconclusive Quantum Measurements and Decisions under Uncertainty

We give a mathematical definition for the notion of inconclusive quantum measurements. In physics, such measurements occur at intermediate stages of a complex measurement procedure, with the final measurement result being operationally testable. Since the mathematical structure of Quantum Decision Theory (QDT) has been developed in analogy with the theory of quantum measurements, the inconclusi...

Validation of primary hydrophone calibrations by inter-laboratory comparisons and by independent calibration methods

Characteristics of precision 1Ω standard resistors influencing transport behaviour and the uncertainty of key comparisons

National measurement institutes (NMIs) participate in international key comparisons organized by the Bureau International des Poids et Mesures (BIPM), the Regional Metrology Organizations (RMOs) or the Consultative Committees of the Comité International des Poids et Mesures (CIPM) in order to provide evidence of equivalent reference standards and measurement capabilities. The US National Instit...

Comparisons can be odious

When I first started working in the field of epilepsy, over 25 years ago, therapeutic options were much more limited than they are today. Surgery had not yet reached an established place in the management of intractable epilepsy and the pharmaceutical industry seemed little interested in producing better drugs for treating the condition with fewer side-effects. By comparison, with the pressure ...