Fundamental research

On the base of the results determined by using modern physical material science methods scientific principles referred to relationships of structure, phase composition, physical and mechanical properties formation of frame metal-ceramic composites based on tungsten carbide with a multicomponent high-entropy alloy (HEA) binder during high-speed electron-beam and induction sintering has been developed for the first time and will play an important role in deepening the understanding of the processes of structure formation in dispersed heterogeneous systems.

The perspective of using combined thermal, ionic and deformation effects as a tool for purposeful modification of the structural and phase states of the near-surface region of a wide class of structural and functional metal materials to increase the durability, quality and reliability of parts, products and structures of transport engineering and medicine has been proven. Steels 40X13, 08X18N10, 9Г2ФА, aluminum alloys AMg6, D16, cobalt alloy Co-Cr-Mo-W, brass LS59-1, titanium alloy VT6, multi-component alloys Fe81B7Si1P10Cu1, CrMnFeNi2CoCu, etc. were studied.

The object of the study is non-minimal-phase radio-wave filters of planar design (stripline and microstrip), which, in addition to reflection-type resonators, contain through-type resonators, and which use mixed electromagnetic couplings between resonators.
The subject of research is the influence of mixed electromagnetic coupling on the frequency characteristics of more complex non-minimal-phase planar filters, which should lead to the creation of a new theory.

The work aims to create, experimental and theoretical study of nanostructured functional materials based on Si, Ge, C and ZnO in order to determine their fundamental properties for further use of these materials in optical and sensor electronics, in particular as electrically active elements, thin functional layers, light-emitting materials in optoelectronic devices, means of visualization, light indication and gas sensors and subwavelength optical micromechanical devices.

The development is devoted to high-speed electron-beam sintering of samples from metal and metal-ceramic materials based on refractory compounds. The basic laws of structure formation in the conditions of electron-beam sintering of metal and metal ceramic materials are established. Computer simulation methods have been used to study the effect of porosity and porous structure of samples sintered under electron-beam sintering conditions on their temperature field and thermal conductivity.

An analytical report on the main methods of wastewater conditioning has bee created. The analysis of the average composition of wastewater. Rational conditions for the synthesis of new specialized reactants for purification and electrochemical stabilization treatment of industrial and municipal biologically prepared wastewater have been selected.

The scientific foundations for the accelerated formation of nanoscale, thermally stable films based on FePd, FePt with a magnetic-hard L1о phase for use as a medium of high-density magnetsc recording have been created. The influence of the chemical and mechanical factor of hydrogen action on the phase composition and structure, as well as the physical factor of the effect on the electronic structure of nanoscale films based on FePt and FePd doped with Au, Ag, Cu, and their magnetic properties was estimated and taken into account.

The scientific foundations for the accelerated formation of nanoscale, thermally stable films based on FePd, FePt with a magnetic-hard L1о phase for use as a medium of high-density magnetsc recording have been created. The influence of the chemical and mechanical factor of hydrogen action on the phase composition and structure, as well as the physical factor of the effect on the electronic structure of nanoscale films based on FePt and FePd doped with Au, Ag, Cu, and their magnetic properties was estimated and taken into account.

For the first time a comprehensive study of the processes of heat transfer and hydrodynamics during evaporation and condensation in closed miniature two-phase systems was carried out. The regularities of the influence of geometric and regime factors on the thermal resistance and maximum heat fluxes of miniature heat pipes, thermosyphons and pulsating capillary heat pipes are revealed. The physical model of heat exchange processes in the conditions of limited space at application as heat carriers of ordinary liquids and nanofluids is developed and presented.

A theory is developed for the propagation of spin waves in heterogeneous ferromagnetic systems. The theory provides for the generation of spin waves using a spin-polarized current and control of the process of propagation of spin waves in such media. In particular, the mechanism of excitation of dipole-exchange spin waves in a multilayer ferromagnetic nanosystem is presented.