Studying methods for producing new composite materials based on compounds of the B-N-Al-Ti system using high pressure (up to 5 GPa) and temperatures (up to 1800 K), studying their physical characteristics to create tool materials based on them. Studying the prospects for the further development of research and the practical use of the results.
The article is devoted to the analysis of the quality of the metal deposited on the entire worn surface of the wagon wheel. The values of the specific energy of the multi-electrode surfacing process, determined by voltage and current, providing the necessary heat supply to the base metal to heat it up to 200 °C, have been experimentally identified. The technological sequence of surfacing wide-layer beads on the rolling surface and the wheel flange is presented. The adopted scheme of bead overlayingcreates favorable conditions for the course of thermal deformation cycles of surfacing. The quality of the bead formation is affected by the location of the electrodes relative to the surfacing surface. Depending on the required thickness and width of the bead applied to the cylindrical surface of the wheel, the diameter and number of electrodes, as well as the value of their displacement from the zenith, were selected. The reasons for the formation of defects and methods of their elimination are revealed. It has been determined that on optimal regimes without pre-heating the wagon wheel, it is possible to obtain metal without defects and brittle structures on the restored surface.
The article is devoted to cluster analysis of the regions of the potential location of logistics terminals. The subjects of Uzbekistan are divided into four clusters depending on the level of their socio-economic, infrastructural development, geographical location and the volume of transport work performed. A statistical model is developed that includes a set of equations and dependency functions of such socio-economic factors in the formation of the logistics infrastructure of the regions as average per capita income of the population, the gross regional product (GRP), specific volume of trade and industrial production, exports and imports, the level of investment, the number of the economically active population, the volume of fixed assets and transport services, as well as indices of transport work - the physical volume of transportation by road and rail. The dependence of the volume of transport services in the regions of the Republic of Uzbekistan on the income of the population, the gross regional product, the density of roads, the volume of exports and belonging to clusters was established. As a result, the regions of Uzbekistan, in terms of the location of freight infrastructure on the railways in order to develop potential transport and logistics clusters, were grouped depending on the indices of socio-economic and infrastructure development.
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