Fundamental research

Development of theory and circuit solutions of non-minimum-phase planar filters with mixed couplings for telecommunications

Development of theory and circuit solutions of non-minimum-phase planar filters with mixed couplings for telecommunications

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.

Theoretical and experimental study of nanostructured functional materials perspective for gas sensors and optoelectronics

Theoretical and experimental study of nanostructured functional materials perspective for gas sensors and optoelectronics

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.

Physics of high-speed electron-beam sintering of homogeneous and heterogeneous high-temperature materials

Physics of high-speed electron-beam sintering of homogeneous and heterogeneous high-temperature materials

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.

The latest effective technologies for conditioning biochemically treated wastewater for industrial reuse

Новітні ефективні технології кондиціювання біохімічно оброблених стічних вод для повторного промислового використання

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 formation of structure, magnetic properties of nanoscale FePt(Pd) films by hydrogen heat treatmant for information magnetic recording of a high density

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.

ФThe formation of structure, magnetic properties of nanoscale FePt(Pd) films by hydrogen heat treatmant for information magnetic recording of a high density

Заміна структури і магнітних властивостей плівок FePd при вівдпали у врдні

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.

Heat transfer and fluid dynamics in miniature two-phase heat transfer systems

Heat transfer and fluid dynamics in miniature two-phase heat transfer systems

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.

Interaction of spin waves and spin-polarized current with magnetic inhomogeneities in nanostructured ferromagnetic materials

Interaction of spin waves and spin-polarized current with magnetic inhomogeneities in nanostructured ferromagnetic materials

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.

Research of biosorbents with natural ferrimagnetic properties for water purification

Research of biosorbents with natural ferrimagnetic properties for water purification

The aim of the project is to substantiate and develop theoretical and experimental scientific principles of technology of natural and artificial magnetic labeling of microorganisms and fungi from BMN for water purification. As a result of the research, potential producers of BMN were identified among microorganisms from BMN (bacteria, microalgae) and fungi used for water purification. Systematized microorganisms from BMN (bacteria, microalgae) and fungi, in the presence or absence of crystal structure and localization of BMN formations.

Application of stochastic, statistical and functional methods to analysis of asymptotic behavior of random fields

The project is aimed at studying asymptotic behavior of random fields and functionals related to them, as well as applications of obtained results to the theory of random processes, statistics of random processes, mathematical analysis and mathematical physics. While solving the set of tasks the following results were obtained.

Pages