Different constructions of the sensing elements of radio-frequency level sensors based on sections of long lines are numerically investigated by means of the Matlab program for the purpose of minimizing the measurement error caused by the nonlinearity of the output characteristic. It is shown that the nonlinearity is lowest for U-shaped designs. The nonlinearity factor KN may be regulated by varying the capacitance of a correcting capacitor connected to the input of the sensing element and (or) the length of one of the sections of the long line. In selecting an optimal capacitance of the correcting capacitor KN ≤ 0.15% for control media with dielectric permittivity in the range 2.2–30. Keywords: radio-frequency level sensor, output characteristic, linearization, nonlinearity factor, dielectric permittivity.

A method is proposed for the investigation of the dynamic parameters of breathing and heartbeat based on the analysis of a block of coefficients of the wavelet transform of the phase signal assumed by a radiowave sensor. We note the high sensitivity of the method to local changes in the form of the components of the signal and its outlook for the creation of expert diagnostic and identification systems. Keywords: diagnostics, breathing, heartbeat, radiowave sensors, continuous wavelet transform.

The factors that affect the errors of analog and digital methods of measuring resonance frequency are considered. Analytical expressions are obtained for the errors of each of these methods, taking the appropriate factors into account. The errors of the digital method are investigated numerically in the Matlab medium. Keywords: resonance frequency, analog and digital methods, noise.

Статья содержит дополнения и улучшения к уже опубликованной статье автора "MODELING CLUSTERS OF EXTREME VALUES".

Using known entropic and information inequalities, we obtain new inequalities for some classical polynomials. We consider examples of Jacobi and Legendre polynomials.