Spin wave propagation in heterogeneous modulated ferromagnetic structures with complex interfaces

A theory is developed for the reflection of spin waves from periodic modulated ferromagnetic structures with complex interfaces, taking into account the generalized boundary conditions including the inhomogeneous character of the contact boundaries of two homogeneous media formed as a result of the superposition of crystal lattices of two contacting

Development of technology and equipment for profiling of corrugated and ribbed tubes and creation of high-performance heat exchangers

The work is aimed at creation of high-efficiency heat regenerators of gas turbine units (GTU) of the gas transportation system of Ukraine. It is proposed to use highly effective heat exchange surfaces from the tubes of the spiral corrugated profile with high heat and aerodynamic characteristics for heat regenerators GTU, which will ensure a reduction of mass-dimensions by 30- 40% in comparison with heat exchangers made of smooth round tubes and an increase in the KPD GTU from 18-25% to 38-41%.

Heat and mass transfer during condensation of water steam from the products of combustion on the surface of profilled finning tubes

Full-scale development in Ukraine of a huge potential for energy saving due to the utilization of the heat of exhaust gases of industrial power and technological units that use hydrocarbon fuels is impossible without deep cooling of these gases in condensing heat exchangers.

Mechanisms of intensification of sorption process of heavy metal ions by dry magnetically controlled biosorbents for the purification of the waste water

The newest method of manufacturing a dry magnetite biosorbent (MBS) on the basis of Saccharomyces cerevisiae yeast was developed using a magnetic fluid with a magnetic susceptibility sufficient to effectively remove the iosorbent from the liquid stream contaminated by heavy metal ions, high-gradient magnetic separators (HGMS), whose efficiency is determined by the structure of high-gradient ferromagnetic matrixs (HGFM). The obtained results showed

Elaboration of innovative technology and equipment for molding products from intelligent polymer composite materials

1.A new technology has been developed and new designs of devices for the manufacture of intelligent polymer composite materials (PKMM), incl. using ultrasound (US), for energy-efficient and high-performance production of products from intelligent polymer materials (IPM) on their basis.

Investigation of the Usage Efficiency of Impulse Ultrawideband signals in the Communication Radio Systems and Networks

Impulse-Radio Ultra-Wideband signals (IR-UWB) show considerable promise due to their numerous advantages that allow creating a ―new‖ radio engineering in the future and communication systems with properties that have not been yet realized. Taking into account constantly increasing deficit of radio waveband for conventional telecommunications systems, which is especially relevant to mobile and satellite communication services, the implementation of

Development of the generalized lifetime prediction method for composite structures at complex low-cycle loading conditions with taking into account damage

The main result of the work is the development of generalizing phenomenological models of damage for anisotropic CM under static and cyclic loading conditions. A tensor of the damage
parameters for different CM’s and its invariants are shown. The methodology and the corresponding experimental data of CM’s mechanical characteristics for static and low cyclic loading conditions was obtained. Parameters of the developed model was calculated. The dependence of the damage parameters on the anisotropy CM is obtained. It makes it possible to

Elaboration of powerful gas-discharge electron gun for impulse deposition of multi-component and chemically-complex coatings

Conditions of forming of impulse electron beam in power triode high-voltage glow discharge electron gun with using low-voltage additional discharge are investigated theoretically and experimentally. By using simulation technique basic geometrical and energetic beam parameters with taking into account thermodynamic parameters of anode plasma are defined. Particularities of transporting and scanning of formed electron beam are also theoretically investigated.

Enhancement of laser processing results(alloying, cladding, rapid prototyping) by controlled characteristics of gas-powder stream

Experimental investigations of the influence of gas-powder mixture supply nozzles configuration on the efficiency of gas-powder laser cladding were conducted.
Nozzle designs that guarantee maximum efficiency and quality of laser cladding were