Digital Power Network Parameters Measurement

Exact measurement of the parameters of a power network is now possible by digital methods. The description of the proposed and realized instrument based on the digital sampling method is given. It can measure basic parameters of the three-phase power network such as rms values of voltages and currents, powers, energies, power factors and the network frequency. Questions concerning the accuracy of measurement, error sources, and error correction are also given. A method of calibration based on the frequency output is proposed and its calculation accuracy evaluated by MATLAB

Active Two-Port Equivalent Noise Parameters

A method of the calculation of active two-port equivalent noise parameters from n measured noise figures for different values of signal source output admittance is given

Deletion delta F508 and haplotype analysis of CFTR gene region in Slovak CF patients.

Analysis of a sample of 50 unrelated cystic fibrosis (CF) patients and 46 nuclear families from Slovakia (Czechoslovakia) by the polymerase chain reaction and Southern hybridization revealed that the proportion of the delta F508 mutation was 58% in this population, and that the frequency of the B (i.e., KM19/XV2c [1-2]) haplotype was increased in both delta F508 and non-delta F508 CF chromosomes (98% and 46%, respectively). These results support the view that the trans-European gradient of the delta F508 frequency is of a geographical rather than of an ethnic origin, and that in Slavonic populations, there exists an as yet unidentified but frequent CF mutation other than delta F508, associated with the B haplotype