No abstract

No abstract

The article analyzes the results of verification of measuring current transformers of various types. Based on the results of the analysis, the dependences of the metrological characteristics of measuring current transformers on their type were revealed. A conclusion is made about the applicability of the identified dependencies for assessing the quality level or predicting metrological failures.

The article considers a simulator/analyzer that provides simulation modeling of microwave ampli-fiers and oscillators in accordance with their technical specifications, followed by the measurement of complex load reflection coefficients of the active component of these devices for their design. It also considers a method of measurement of these parameters and a method of calibration of the simula-tor/analyzer providing transfer of measurement results from the coaxial measuring line of the simula-tor-analyzer to the microstrip line. In addition, the article considers a method for analyzing the stability of the active component in the space of complex reflection coefficients of its loads, which facilitates their selection in the simulation of amplifiers and oscillators.

The article considers the influence of the blackness coefficient on the emissivity of various materials. Determining the precise values of the thermal conductivity and heat exchange is of crucial importance to solve problems of power supply and to ensure optimal temperature conditions of premises since the choice of materials for the manufacture of various buildings, structures and their structural elements depends on the heat exchange. The emissivity of materials, in particular, the values of the blackness coefficients in the calculation of radiation heat exchange plays a significant role in the formation of the thermal balance. The contribution to the total heat exchange from radiation processes can be significant and vary significantly for different temperature conditions. This study demonstrates that the error in estimating the radiative heat flux depends on the type of spectral characteristic of its emissivity, and the use of the integral blackness coefficient can significantly increase the error in determining the heat flow from the surface of objects, including construction materials.