OBJECTIVE To quantify the errors associated with manual measurement of QT intervals and to determine the source of the errors. DESIGN A randomised study of QT measurement by four cardiologists of electrocardiograms plotted on paper in presentations with different noise levels, paper speeds, amplifier gains, and with and without a second QRST complex to indicate the RR interval. SUBJECTS Fou...

Modern spaceborne radar scatterometers such as the NASA Scatterometer (NSCAT) and SeaWinds radar instruments require precise determination of the normalized backscattered radar cross section within a few tenth of a decibel in order to achieve the desired wind velocity and direction measurement accuracy of 2 m/s and 20 degrees respectively. This high level of precision requires a priori prelaunc...

This paper describes the experimental characterisation of MIMO propagation channels. The requirements for the measurement system are discussed and the developed system is described. At the second part of the paper the analysis methods of MIMO measurement results are introduced and results are presented both for outdoor and indoor for several different antenna configurations. The significance of...

Liquid ultrasonic flow meters (LUFMs) continue to gain popularity in petroleum measurement with the promise of high accuracy and low maintenance. These are favorable features, but because of the high volume and value of petroleum products, buyers and sellers must have a high level of confidence in the accuracy of measurement. This assurance in custody transfer measurement is gained by adherence...