Fundamental research

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.

Influence of ion irradiation on structure, absorption capacity and corrosion properties of nanosized metal compositions

Моделі генерації дефектів

It is shown that the method of bombardment of a nanothick vacuum-condensed metallic substance with low-energy ions is a promising tool for the purposeful formation of such gradient distributions of structural-phase states that provide new properties. New methodological approaches have been developed in the structural analysis of nanoscale materials using synchrotron radiation (with a photon flux density by 12 orders of magnitude, and an exposure duration 150 times shorter than provided by traditional methods of X-ray structural analysis).

Intractable problems of combinatorial optimization and the theory of PSC-algorithms

Gantt chart of the operation plan for the product group.

The work continues a series of works devoted to the development of the theory of PSC-algorithms and to the creation on its basis of models and methods of scheduling, operational planning, and decision-making in complex socio-economic systems with a network representation of technological processes and limited resources.

Physicochemical bases of low-temperature synthesis (700 - 1500 оС) of ultra-refractory high-strength reinforced ceramics and metal-ceramics of multifunctional application

Physicochemical bases of low-temperature synthesis (700 - 1500 оС) of ultra-refractory high-strength reinforced ceramics and metal-ceramics of multifunctional application

An integrated approach to the creation of scientific physicochemical foundations of the process of synthesis of large polycrystalline samples or products of reinforced ceramic high-temperature materials at low temperatures is implemented, which involves the use of a capillary-porous body with predetermined structural-geometric characteristics of pore channels as a medium for growing fibers reinforcement (the first at the level of separately taken powder particles from which a capillary-porous t is made) ceramic composite.

Theoretical and experimental investigations of electronic, magnetic and optical properties of nanosized carbon-containing materials

Luminophores of “white light” are an important part of white-light-emitting diodes, and the main part of these diodes consists from UV light sources (usually an InGaN based light-emitting structure) and a luminophor transforming UV into a broad spectrum of white light. To date, rare earth or heavy metals are the main components of luminophors leading to its recycling complexity and increase in manufacturing costs. Moreover, the spectral characteristics of the modern commercial luminophors do not correspond to the spectral characteristics of the sunlight.

Creation of methods for designing the processes of shaping engineering structures under viscoplastic deformation of homogeneous, eutectic strengthened and powder materials

In this work, using a unified theoretical approach, the analysis of the processes of visco-plastic forming of typical mechanical engineering structures with homogeneous and structurally heterogeneous materials. The theoretical approach is based on a closed system of equations of the theory of plastic flow of continuum mechanics, taking into account the visco-plastic properties of materials. This approach made it possible to provide system design of structural forming processes.

Theoretical principles of constructing intelligent scalable computer systems for the critical objects monitoring

The main idea of ​​the approach used in the project is to create a fundamentally new architecture for intelligent scalable software and hardware for monitoring critical objects based on the use of distributed sensor networks. The main focus of the research is on the important scientific and technical problems of analysis, verification and systematization of heterogeneous nature data. The work uses modern scientific and technical tools for processing large volumes of data, which in the literature combine the term Big Data.

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