State support of stability in Coal-Donbas regions

Purpose. To develop a new approach to feasibility assessment mechanism of supporting production facilities of loss-making mines in Donetsk and Dnipropetrovsk regions. Methods. To solve the objective set, a complex approach was used including as-sessment of enterprise investment attractiveness, determination of production potential, definition of the ability to switch to a break-even mode. The process for planning ways to save the industrial potential of coal-mining regions may be considered as the reflection of multidimensional space (initial and design values) into the one-dimensional (amount of investment money). Findings. It has been established that on the stage of building a model for managing mine unprofitability decrease processes, it is necessary to overview 8-10 factorial features, which may determine the formation of economic potential, taking into consideration peculiarities of remaining deposit bedding and their quality, as integral assessment of mine potential in terms of (state and non-state) investment perception. The objective set comes down to selection of the mini-mum number of factors, which would the most adequately reflect the mine internal potential expressed by economic value added – as a consequence of interaction of factors of coal mine economic activities in specific mining, geological and technological conditions. Originality. The academic novelty is that as a complex component of the state of the loss-making mine, it is reasonable to use an indicator of economic reliability, which synthesizes the capacity of links, economic level of technical and economic indicators and the amount of remaining deposits. The latter determine the residual life of the mine, physical content of the proposed indicators is not identical, and it is this fact, which allows for their joint use to obtain a more complete estimate than when using any single indicator. Practical implications. Practical significance includes actual assessment of the state of Donbass coal enterprises and determination of marginal break-even indicators, which allowed for the formation of recommendations for attracting financial resources

Non-parametric models of stochastic systems with delay

The paper considers an identiЇcation problem for stochastic static systems with delay. The identiЇcation problem is investigated in a broad sense, specially under conditions of non-parametric uncertainty, i. e. in the case when parametric structure of the model is known to within parameters vector. The new classes of non-parametric estimations of regression line of observations is proposed. The paper gives the corresponding theorems of convergence for non-parametric esti- mation and models

Non-parametric models of stochastic systems with delay

The paper considers an identiЇcation problem for stochastic static systems with delay. The identiЇcation problem is investigated in a broad sense, specially under conditions of non-parametric uncertainty, i. e. in the case when parametric structure of the model is known to within parameters vector. The new classes of non-parametric estimations of regression line of observations is proposed. The paper gives the corresponding theorems of convergence for non-parametric esti- mation and models

Influence of the oxide phase on the process of inflation of composition from iron powders

The article describes a new technology for the production of steel parts for structural purposes. The technology is based on molding mixtures of iron powders, iron oxide powders and a binder. Technological processes include the processes of vacuum reduction of iron oxide and a binder material with subsequent sintering of the mixture. The study of the features of the brass infiltration process is carried out on highly porous iron-based blanks with pore sizes less than 1 μm with various percentages of the starting components. The analysis of the structures and mechanical properties of materials obtained on the basis of the developed technology has been performed. The mechanism of infiltration of highly iron-based preforms based on iron obtained by casting from the compositions “iron-iron oxide-phenol-formaldehyde resin” obtained in three stages is established. Recommendations have been developed for the pilot production of products of complex shape from iron-based metal powders, including of casting molding operations, oxide reduction and sintering operations, followed by brass infiltration and heat treatment of the products. The introduction of new technology makes it possible to produce products of complex shapes with a high level of mechanical properties, improved dimensional accuracy and lower cost