Vol 59, No 5 (2016)

Metrological support in accounting for thermal energy and heat-transfer agents is discussed for the example of an overflow from a cold water supply system into a heating system. Ways of increasing measurement adequacy using a regression model of an object are introduced.

We present a method for determining aggregate primary parameters of a two-wire transmission line based on the results of measurements of currents, voltages and the difference between their phases when performing two experiments – idling and partial short-circuit. This approach to the problem of forecasting electrical energy transfer results may be promising as suitable technical support for a series of necessary experiments.

Features of the method of multiple-operation magnetic monitoring of ferrous impurities in natural and industrial media are identified and ways of improving the method are proposed. A model that involves autonomous exponential extrapolation of an identified second (tail) segment of a mass-operational dependence is constructed. A formula for use in calculating the total masses and mass fraction of ferrous impurities in samples that have undergone magnetic monitoring is found.

A technique for tuning microwave strip devices with different dimensions and terminal sizes is discussed. The design of a measuring instrument and a method for making the measurements are proposed. The frequency characteristics of calibration plates in the form of 50-Ohm micro-strip line segments are studied.

The application of the nonparametric Anderson–Darling, Cramer–Mises–Smirnov, Kuiper, Watson, Kolmogorov, and Zhang goodness-of-fit tests in verification of simple and composite hypotheses is considered. Based on an investigation of the power, it is shown for the first time that there exist pairs of competing hypotheses which these tests are not able to distinguish in the case of small sample sizes n and type 1 error probabilities. It is shown that the reason for this lies in the bias of the tests in corresponding situations.

Evaluation results of the developed method are presented. The mean energy value of the Hilbert spectrum of a speech signal obtained by the complementary ensemble empirical mode decomposition and the Hilbert–Huang transform is shown in different ranges depending on the choice of phrases formed by separate active organs of the speech apparatus.

We study the effect of varying stiffness of elastic gaskets located between an accelerometer and the controlled object, on the dynamic measurement error of peak impact acceleration.

We investigate a nonlinear parametric method of estimating the instantaneous frequency and amplitude of a quasi-harmonic signal. We obtain analytical expressions for variance estimates and their displacement, confirmed by numerical simulations. Experimental verification of the method on a real signal confirmed the ability to determine its frequency with a relative error less than 10^–5 in a time interval of about 30 periods of the test signal.

The results of a voltage-current characteristics study of sensors made of graphite paper with multiwall nanotubes are presented. It has been found experimentally that these samples are usable as gas sensors for the detection of NH₃, H₂, and Cl₂ in air.

Improvements in the National Primary Standard for the Units of the Propagation Velocities of Longitudinal, Shear, and Surface Ultrasonic Waves in Solids are discussed. A new standard apparatus for reproduction of the unit of the damping coefficient for longitudinal ultrasonic waves is described. It is based on contactless capacitive methods for generating ultrasonic waves and pulse-echo and resonance measurement techniques for receiving them. The metrological characteristics of the National Primary Standard for the Units of the Propagation Velocities and Damping Coefficient of Ultrasonic Waves in Solids, GET 189-2014, are given.

The principle of quantum fluctuation compression with parametric control of the oscillatory system employed in ultra-high sensitivity measurements is discussed. An experiment is proposed in which a quantum compression mode is realized in a hysteresis-free regime with SQUID RF parametric pumping and a special microwave test signal.

A raster-interference device for use in experimental investigation of the guidance errors of measuring instruments at the illuminance extremum of a spatial scale formed by a union of rasters is considered. A converter with combined scanning, compensation, interpolation, and guidance functions as well as a precision digital extremal photoelectric counting interpolation system intended for measurements of linear and angular displacements is proposed.

Brief information is given on the NTP servers of the All-Russia Research Institute of Physicotechnical and Radio Measurements (VNIIFTRI). Data of experimental investigations performed for the purpose of determining the real divergence of the system time scales of client computers relative to UTC(SU) in synchronization with respect to a group of Stratum 1 level NTP servers as well as the results of remote monitoring of the time scales of NTP servers are presented.

A fuel flow rate transducer design for a manned transport spacecraft is proposed. It is based on the principle of measuring the phase of the useful signal carrier frequency. This scheme significantly improves the stability of the instrument against mechanical interactions and provides more accurate measurements of the amount of fuel consumed by the spacecraft.