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Existing studies in the field of application of the granulation process have proven the effectiveness of this process in eliminating the disadvantages that loose compound feeds have. The technology of granulation of compound feeds allows to ensure stable uniformity, improve sanitary and hygienic indicators, increase nutritional value, increase shelf life, as well as minimize losses during its transportation and distribution. Due to the growth in the production of compound feeds, continuous improvement of the equipment, machines and technologies used in granulation is required. We have made a comparative analysis of granulators for various types of indicators: economic, technical, technological, energy efficiency indicators. Three approaches were used to compare them: the rank approach, the standardization method, and the dimensionality reduction method. As a result, the optimization of the obtained results was carried out and, summing up the results of all three methods, the feed granulators were noted, which are the best in terms of the totality of all the parameters studied.

The paper presents a technique for determining the time index of growth of the slope of reverse voltage for double insulated cables, based on the body of the theory of series. It is proved that in the vicinity of the extremum point (maximum) the function of the reverse voltage is approximated by polynomials of the nth power. It is proposed to use second-degree polynomials for practical calculations. The method for calculating relevant indicators is illustrated using real data. Analysis of deviations made it possible to conclude that the calculation method proposed in the paper is far more accurate. In the final part of the study, it was concluded that there is a promising outlook for further development of methodological guidelines for determining complex indices of the remaining life of the cable, including but not limited to the use of various mathematical methods. [ABSTRACT FROM AUTHOR]