International Scientific Journals
of Scientific Technical Union of Mechanical Engineering "Industry 4.0"

Using the methods of systemic, mathematical and numerical analysis, as well as general physicochemical and thermodynamic laws, a complex of theoretical and experimental studies of transfer processes during short-term contact of phases has been carried out. These studies made it possible to fully reveal the regularities of external and internal heat and mass transfer, to find scientifically grounded ways to intensify the processes of vacuum, conductive and combined drying methods. Within the framework of linear nonequilibrium thermodynamics, a mathematical model of filtration-diffusion energy and mass transfer has been developed with a correct estimate of the orders of the terms in the system of differential equations of energy and mass transfer, taking into account the composition of the vapor-air mixture in the capillary-porous body. The limits of applicability of the hypothesis of short-term contact of phases according to the Fourier criterion for the transfer inside and outside the surfaces of the canonical shape (plate, cylinder, sphere) and wedge are estimated from the standpoint of the accuracy of calculating interphase flows. It is shown that in a number of cases the contact is not short-lived due to the curvature and the presence of angles on the contact surface, and not due to the finiteness of the dimensions of the contacting phases.

The peculiarities of the structure and phase composition of the high-entropy alloy of the TiCrFeMnSiC system obtained from the powder mixture of ferrotitanium, ferrochrome and ferrosilicon-manganese ferroalloys are considered in the work. The technological scheme of alloy production included joint grinding of the mixture in a planetary mill, consolidation of the blanks, their heating to 1100 0C, hot forging on the arc press and subsequent annealing of hot-forged samples at 1200 0C. According to the results of X-ray analysis of the obtained alloy, it was found that the main phase of the alloy is the BCC phase with the parameter of the cubic lattice a = 0.2868 nm, which is a solid solution based on alloying components of the original charge. The phase composition of the composite also recorded ti tanium carbide TiC with FCC lattice with the parameter a = 0.4319 nm, which corresponds to a stoichiometric composition of about TiC0.6 and a small amount of FCC phase of iron-chromium carbide (Cr, Fe)23C6 with lattice parameter a = 1.0645 nm. The material has a high hardness (up to 60-61 HRC), which can provide high resistance of this multicomponent alloy.

The Broadband Mobile Satellite Services (B-MSS) are extremely important not only for government (army and police), but for  many civil applications as car, aero, railway and ship communications. Probably they will be part of the future 5-G network development and their security work is very important too. The solving of the main B-MSS security problems needs entirely new approach. The aim of this paper is to analyze two new radio-communication principles, named Spatial Correlation Processing – Random Phase Spread Coding, from security point of view. They were proposed by the author a decade before as antenna transmit-receive beam forming methods with many applications in microwave frequency bands too.

Problem issues of enterprises` investment projects introduction have been studied. Structure of every enterprises` investment projects management stage and their characteristics have been defined. Goal of every investment project`s introduction stage taking into account investment resources need and information processing as for the applied investment projects have been marked. Stages of business investment projects `efficient management regarding development of efficient system of decision making control of managerial system have been suggested. System of investment projects` management not identical to existing ones has been submitted. It has been implied to study it as set of elements, which determine planning process, analysis, organization, introduction and monitoring of an investment project, planned budget, project timing, considering environmental threats and risks to take meaningful decisions, avoiding mistakes and improving organizational structure of an investment project.

The nonequilibrium phase transformation during decomposition of Mg supersaturated solid solutions, containing two rare-earth metals of the different subgroups (cerium and yttrium) are presented and generalized. These processes in the alloys of ternary systems differ from those in the alloys of the adjoining binary systems. They reveal also the similar features in kinetics and the nonequilibrium phase formed during solid solution decomposition