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In the practice of agricultural machine building and repair of machines, technological methods of surface hardening are widely used, which significantly increase wear resistance and durability of parts. Combined methods of combining temperature, force and time effects in different manifestations, in particular electromechanical hardening, are particularly effective. The purpose of the study is to identify the relationships between the modes and parameters of the process of electromechanical hardening for parts of machines made of unalloyed and low-alloy structural quality steels. The hardening modes include: magnitude of the force and voltage of the amperage on the hardening tool, contact force of the tool to the part. The parameters of the technological process are: speed of rotation of the part, central angle of contact between the tool and the part, time of point contact between the part and the tool, presence of forced cooling, depth of hardening. Among the tested materials -steel 65G and its substitutes according to GOST 14959, foreign analogues 1056 (USA), 66Mn4 (Germany) and 080A67 (England). Based on theoretical relationships between the temperature of phase transformations in steels, amperage on the tool and force of its pressing, taking into account thermophysical characteristics of the material and process of electromechanical hardening, as well as geometrical parameters of contact zone, a mathematical model of dependence of current force at strengthening from of tool contact force and voltage in secondary circuit is obtained with subsequent quantitative estimation of depth of strengthening of the surface layer of the part. In order to study mutual couplings and influence of factors on response functions at studies of the hardening technological process the graphical interpretation of the mathematical model is performed, which allows to justify range of modes of electromechanical hardening at planning of experiments.

The paper deals with water conditioning issues in oil-field development using water-flooding. It is common knowledge that injected water contains oil residues and mechanical impurities, which affect permeability of geological horizon. It has been shown that these water impurities could intensify rock colmatation up to a full clogging of pores and fractures. Hence, issues of improving quality of injected water, aimed to ensure enhancement of reservoir properties, have been studied from a variety of new angles. There are given results of conducted test experiments as well as detailed description of elaborated equipment design. It has been established that two-stage treatment technology proposed in the paper, by making use of magnetic treatment device and sewage tank with liquid hydrophobic layer, will allow to considerably improve quality of injected water. Suggested water treatment unit appears to be highly applicable, providing a maximum effect at a minimum material cost.

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The economic instability of recent decades has various social consequences. One of which is the emergence of abandoned agricultural areas. Analytical studies have shown that geolocation, aimed at creating a digital image of agricultural areas, reveals exclusion zones. The government has set the task of developing programs to involve the agricultural turnover of unused land. It is proposed to carry out a system-architectural design of the target zoning of territories. The selection of the basic model within the architecture of the Database of agricultural lands in circulation is supplemented by a block of a digital image for recognizing resource opportunities. The problem of developing a formalized set of typed commands that structure knowledge about the state of territories and their functionality for expert programming systems is solved. The database is formed from declarative (factual), procedural, and control knowledge. To form the database, the state of unused agricultural land in the country was shown. A forecast was given by the Ministry of Agriculture of Russia for the involvement of fallow lands in the turnover by the end of 2030. The concept of the efficiency of involving unused agricultural land into circulation was presented. A mathematical description of the risks and a graphical presentation of ways to achieve the efficiency of returning unused land by a set of indicators of risk restrictions were given. The key advantage of the developed concept is the creation of a modular-type production infrastructure, which is modernized and filled according to the current needs of economic activity, which is flexible to changes in internal factors and does not require external resources.