Bezgin A.S., Grekov E.L.
EXPANSION OF LOAD CAPABILITY OF THYRISTOR DIRECT FREQUENCY CONVERTER IN THE UPPER RANGE REGULATION OF OUTPUT FREQUENCY ABOVE 25 HZ ^{[№ 9 ' 2013]}
This article discusses the reasons for the instability of the system of "direct thyristor frequency converter (TNPCH) — a two-phase asynchronous motor" with the vector control system at work in the upper range of adjusting the output frequency above 25 Hz. — A simulation model that takes into account the peculiarities of the system has been developed. A method of forming job linkage, taking into account the work of the vector system and the presence of higher harmonics has been provided. An algorithm of position correction of rotating axis control system based on the timing of reversible switching bridges has been developed.

I.I. Grekov, G.B. Zinyukhin, N.V. Tueva, N.N. Tuev, G.L. Ajzenberg
MODELING AND MANAGEMENT OF RURAL REGIONS OF SOUTHERN URAL FOREST-STEPPE LANDSCAPE-CLIMATIC ZONE BY PRODUCTIVE FORCES DEVELOPMENT ^{[№ 3 ' 2003]}
The influence of thirty factors of ecological, social and economic infrastructures on adult and children population health according to medico-demographic parameters and appeal because of 15 classes diseases in four rural regions of Southern Ural forest-steppe landscape-climatic zone is determined quantitatively with methods of statistics and mathematics modeling. Direct connections of health parameters of studied population of inhabitants with head-annual income and return connections with head-annual retail commodity circulation are found out in the article. The practical recommendations of trading network of food and not food goods arrangement optimization on the territory of studied rural regions and recommendations of trade technology optimization are given here.

V. B. Fateev, E. L. Grekov
STAND FOR TRACTIVE ENGINES TESTING ^{[№ 3 ' 2001]}
This article analyses the electromechanical characteristics of developed and applied in industry stand for tractive engines testing in open and closed control system.

Ej. L. Grekov, A. Aj. Mikitchenko, V. E. Sorokin
THE STRUCTURAL ANALYSIS OF ELECTRIC DRIVE`S CONTROL, WHICH IS DONE ACCORDING TO THE SYSTEM - THE DIRECT FREQUENCY CONVERTER — THE ASYNCHRONOUS ENGINE (DFC-AE). ^{[№ 2 ' 2001]}
Different structural systems of control by means of the direct frequency converter are analyzed. The researches are carried out on the basis of the results of physical modeling. The regulators and the structural solutions are examined, which provide the stable work of the drive of the higher yielding frequencies.