For the first time in Belarus chitosan nanofibers are obtained using NANOSPIDER technology at the laboratory unit NS WAB 500 S produced by Elmarco s . r . o . (Czech Republic). The chemical composition is developed, rheological behavior of the forming solution is adjusted, the elecroforming technology is designed, the structure of the nanofiber layer on the backing material is examined at electronic microscope JSM-5610 LV Jeol (Japan). Potentially successful use of chitosan nanofiber membranes in filtration and sorption healthcare and biology processes, particularly in burn injuries and indolent wounds treatment stressed is discussed.

The dependences of critical frequency and imaginary part of complex permittivity of the expanded powdered perlite brand M75 from its water content is researched. It’s proposed to use the investigated results in the creation process of shielding modules on the basis of water-containing expanded powdered perlite with the required electromagnetic radiation transmission coefficients.

It is shown that the quality of gate dielectric has a determinative impact on electrical physical parameters of MOS transistors. Contamination of material by technological impurities during the manufacturing process is the reason for the deterioration of electrical physical parameters of MOS transistors. Sources of contamination can be components of technological equipments, as well as the materials and reagents.

Based on the model of nonlinear elastic-plastic material the phenomenon of breakup of deformation by. F. Bella at soft simple stretching is described. The effects of increase of plasticity and healing of material damage at additional hydrostatic compression are modelled.

The paper is focused on using the finite element method to simulate and analyze the process of end forming of thick walled tubes with three-roll mill. First, a geometric model of the process that considers roll profiles, offset angle and inclined angle of the rolls was constructed. Then, a three-dimensional finite element simulation was conducted to obtain stress distribution in the reduced workpiece.

A kinematic scheme of the machine for simultaneous bilateral processing of lenses is provided and a mathematical description of its working zone is executed. The mathematical model of geometrical and kinematic relationship of input and output links of the executive mechanism of the mentioned machine is developed Analytical expressions for the figurative speed of the top and lower tools are obtamed and a method of calculation of laws of their returnable rotary motion is offered.

Elastic properties of a magnetic fluid drop with a compound source of magnetic field in a wedge-shaped channel with regard to vibroprotective devices are examined experimentally. A possibility to alter an elastic force and a position of such drop by means of electromagnetic field has been shown. Obtained data allowed to calculate elastic coefficients of the observed system. Control ranges of the position and the elastic force of the drop are evaluated.

A variant of the gradient calculation of the magnetic induction at magnetic abrasive machining of taper lampshades and manner of its exercise, by changing profiles (profiling) of the surface of the pole pieces. The optimal regimes of magnetic abrasive machining, which provide high light reflectivity of surfaces of lampshades, are determined.

Particle wear in a dense rotating bed inside static vortex chamber is calculated. The known engineering method is shown to be good enough for it. Lateral wall of the chamber is exposed to the most wear. Wear is proportional to pressure on lateral wall. Wear intensity may be diminished by the use of hard materials for walls and particles or applying a special sacrificial interlayer.

Results of research of radiation convective drying of fabrics are stated. Dependences of criterion of Boltzmann for a damp body from key parameters of drying kinetics are established. The empirical equations for calculation of time of drying, temperatures of a material and thermal streams are given in the period of the decreasing speed. Methods of the theory of similarity of heat exchange and the theory of a regular thermal mode of heating of damp bodies were used during the processing of experimental data.

The structure of the world electricity production is reviewed. It provides an assessment of actual use of the most promising renewable energy sources in Belarus; an environmental impact assessment of different power sources and fuels; an evaluation of economic efficiency of renewable energy considering environmental factors. It also presents an analysis of the reasons impeding the development of renewable energy in Belarus, and possible solutions.

A mathematical model of moisture transfer in capillary-porous media is proposed. It is based on the equations of twophase filtration, isotherms of moisture sorption, thermodynamic equations of Kelvin and Klapeirone - Klausius . The numerical method of moisture transfer equations solving is developed on the basis of weighted residuals method. The results obtained can be used for simulation of heat and mass transfer in different technological processes, in building, food and chemical industry, and in agrophysics also.

The results of the numerical solution of the heat problem of whole body gas cryotherapy (WBGC) using models with lumped and distributed parameters have been presented. Heat transfer coefficients from the surface of various parts of the human body, which correspond to given (measured by thermographic technique) average temperatures of these surfaces after the completion of WBGC procedure were calculated. It has been found out that the model with lumped parameters gives strongly understated values of heat transfer coefficients in comparison with empirical reference data. Model with distributed parameters reveals the best fit of the calculated heat transfer coefficients to the reference data. The maximum difference was less than 26%.

A combined method of calculation of a temperature field of a package of materials of a protective clothes of fireman during thermal impact is offered. The method is based on a basis of a combination of elements of the analytical and numerical decisions. Reliability of the developed method is confirmed with pilot studies. The carried-out complex of researches gives a chance to design optimum structure of a package of fighting clothes of firefighters that leads to essential reduction of time and material inputs when carrying out standard tests.

The results of study the effect of temperature on the culture surface topography and mechanical properties of human lung cancer cell line A549 by atomic force microscopy are presented. It is shown that lowering the temperature of cultivation does not lead to significant changes in the mechanical properties of A549 cells, but the cells under the influence of low temperatures tend to increase the adhesive force between the probe tip to the membrane surface.

The effect of copper and silver nanoparticles Cu+Ag, silver nitrite AgNO₃ and zinc oxide ZnO on morphology and mechanical properties of immunocompetent cells bovine kidney line MDBK is investigated by atomic force microscopy. The results of calculation of the local elastic modulus, strength, surface cell adhesion, adhesion work, and the three-dimensional image analysis of cells in control and after incubation with the nanoparticles bioelements for 20 min are presented.

The electrically active defects in synthetic single crystals of HPHT diamond have been investigated using photo-induced current transient spectroscopy (PICTS). It has been found that kinetics of photocurrent is of complex nature in the temperature range 400-550 K. Detailed analysis of photocurrent relaxation on the basis of approximation by the sum of two exponential components has been performed. It is shown that their contributions cannot be interpreted as the result of thermal emission from two independent local levels. These defects are suggested to be responsible for the long photocurrent stabilization in detectors made of HPHT diamonds.

An algorithm of particle in cell simulations is described and tested to aid further the actual design of simple vircators working on axially symmetric modes. The methods of correction of the numerical solution, have been chosen and jointly tested, allow the stable simulation of the fast nonlinear multiflow dynamics of virtual cathode formation and evolution, as well as the fields generated by the virtual cathode. The selected combination of the correction methods can be straightforwardly generalized to the case of axially nonsymmetric modes, while the parameters of these correction methods can be widely used to improve an agreement between the simulation predictions and the experimental data.

Environmental and economic indicators of different methods of sulfur dioxide (SO₂) emissions treatment have been considered. It have been shown that the lime and limestone methods and electron-beam method have the lowest cost for treating of 1000 m³. But the electron-beam method is also capable to treat sulfur dioxide (SO₂) and nitrogen oxides (NO) emissions at once.