питомий опір

The paper analyzes methods for controlling the quality of concrete using both non-electrical and electrical techniques, particularly by means of specific resistance. Based on this analysis, it was determined that the practical implementation of the electrical method, which uses electrical resistance as an informative parameter, is relatively rare. Dielectric permittivity, as an informative parameter of concrete, is typically applied only for monitoring concrete moisture with dielectric moisture meters.

The electron energy state, magnetic and transport characteristics of thermometric materials HfNi1-xCoxSn were investigated in the T = 80 ¸ 400 K temperature range and at charge carriers concentration from Co » 9,5×1019 NA см-3 ( x = 0,005 )÷ 5,7 ×1021 см-3 ( x = 0,30 ) and H £ 10 kGs. The material HfNi1-xCoxSn is sensitive to the temperature change and could be used as the basis for the sensitive thermoelectric devices. We investigated the crystal structure, electron density of states (DOS) and the kinetic and energy characteristics of n-HfNiSn heavily doped with the Co impurity.