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Study of influence of measuring system parameters to the value of active and reactive component of the substance electrical conductivity

Gonsor O., Tomasik M.

ECONTECHMOD : An International Quarterly Journal on Economics of Technology and Modelling Processes

2017

Vol. 6, No 1

31--36

Electrical conductivity is an important electrical parameter of the substance, by which you can identify its quality characteristics. Determining the admittance of the substance is crucial. Admittance of the substance as an active element depends on its chemical composition, temperature, voltage that is applied to the measuring circuit and the frequency of the measuring signal. In this regard, it is advisable to carry out a series of experimental tests to determine the effect of these parameters on the admittance of the substance. The object of research is water from different sources of centralized drinking water supply. For theoretical analysis of admittance, water is seen as a multi-element two-terminal, placed in the electric circuit of alternating current. To reduce the methodological error, active and reactive components of electrical conductivity were researched in different frequencies ranges (from 50 Hz to 100 kHz). Investigation of the temperature dependence showed that the active and reactive components of the electrical conductivity are temperature dependent, but the reactive component is less sensitive to change. The dependence of the admittance of the frequency at different levels of the test signal is investigated. The article presents the graphical specification of changing admittance at the change of frequency, at different levels of the test signal. Also, the dependencies of active and reactive components were studied of the electrical conductivity of drinking water from changing test signal U at different frequencies.

Reconstruction of FHR series recorded via ultrasound - method validation using abdominal fetal electrocardiography

Kupka T., Horoba K., Roj D., Matonia A., Czabanski R., Jezewski M.

Journal of Medical Informatics & Technologies

2013

Vol. 22

135--141

Analysis of variability of the fetal heart rate (FHR) is very important for fetal wellbeing assessment. The beat-to-beat variability is described quantitatively by the indices originated from invasive fetal electrocardiography which provides the FHR signal in a form of time event series. Nowadays, monitoring instrumentation is based on Doppler ultrasound technology. The fetal monitors provide the output signal in a form of evenly spaced measurements. The goal of this work is to present a new method for the FHR signal processing, which enables extraction of time series of consecutive heartbeat intervals from the evenly repeated values. The proposed correction algorithm enables recognition and removal of the duplicated measurements. Reliable evaluation of the algorithm requires the reference event series, thus the FHR signals were obtained from abdominal fetal electrocardiograms to be used in this research study.

Investigation of correlation measuring method accuracy for two types of test signals

Gavriljuk V., Rybalka R., Bezrukov V.

Transport Problems

2008

T. 3, z. 4

33-38

On the base of developed computer simulation program the comparative investigations of correlation measuring method accuracy with two types of test signals have been provided.

Porównawcze badania dokładności metody pomiaru korelacji dla dwóch rodzajów sygnałów próbnych zostały przedstawione na podstawie opracowanego programu symulacji komputerowej.