A model of thermal processes occurring in porous anodic aluminum oxide with a regular structure is proposed. The dependences of the distribution of the temperature field in parallel and perpendicular directions relative to the channel of porous anodic aluminum oxide were obtained. The resulting temperature distribution along the thin oxide of the rod assumes a maximum in the middle, for cases where the ends of the rod have the same temperature, and the temperature change in the base direction along the thickness of the channel wall is also plotted. The dependence of the heat flow power on the thickness of the resistive layer in the surface layer of the channel of the porous structure was calculated.

Spectral characteristics of ultra-relativistic electron emission under channeling conditions and under the influence of intense laser wave and positrons in oriented crystals in terms of two Lorenz-invariant parameters were compared. Quantum effects in gamma quantum radiation as well as nonlinear effects of higher harmonic generation are considered. A significant difference between oriented crystals and lasers was revealed due to the dependence of the parameter of the non-voltage of channeled particles on their energy. It is observed that in the latter case, the parameter of non-voltage of radiation depends on energy.

In this paper, a mathematical model is constructed to determine the matrix of thermal conductivity coefficients. The heat fluxes of a multilayer medium are found. Functional temperature dependences reflecting thermophysical properties are determined from solving the problem with phase transitions. Numerical calcula- tions were carried out on a computer.

The paper examines the physico-chemical aspects of the interaction between liquid metals and the sur- faces of solid metal substrates, leading to wetting and spreading, and analyzes the effect of the nucleation and growth of intermetallides on these processes. The analysis showed that these processes are influenced by both the structure and the physico-chemical state of the substrate surface, which can be a pure metal, an alloy of variable composition or an intermetallic compound. It has been established that the role of intermetallides in each specific case is different, they can both accelerate and slow down processes, and in some cases do not interact with the liquid at all. An attempt is made to explain the mechanism and nature of these dependencies.

The theoretical calculation of critical parameters as a function of the molecular characteristics of an undeformed polymer is carried out on the example of two types of cross-linked polychloroprene with different degrees of cross-linking, as well as low-density polyethylene. It is shown that the value of the critical degree of folding of macromolecules is controlled by the statistical flexibility of the chain, the crosslinking density of the polymer frame, as well as the type of nucleation and the dimensionality of the crystallization process.

The article presents the results of tests of carbon fiber reinforced plastics (CFRP) samples obtained by milling, laser and waterjet cutting for their fatigue strength under conditions of high-cycle bending loading. It was established that the cutting forces arising during milling and waterjet processing have a more significant effect on the long-term strength of carbon fiber reinforced plastics than the thermal effect during laser cutting. In this case, to a greater extent, the loss of strength during cyclic bending is observed in samples obtained by waterjet cutting.

The features of phase transitions in the homologous series of n-alkanes have been studied. The true values of the thermodynamic parameters were obtained as a result of eliminating the DSC experimental error. The heterogeneous nature of solid-solid phase transitions is revealed. The theory of diffuse phase transitions is applied for the analysis of the heat capacity peaks of such transitions. The dependences of thermodynamic parameters and calculated volumes of nanonuclei on the symmetry of n-alkane molecules are obtained.

The work is devoted to the issues of stationary heat transfer. It considers the problem of finding the dis- tribution of the temperature field of a body of infinite length with an elliptical cross section under boundary conditions of the second kind. Using the methods of differentiation, integration and decomposition into a series, an analytical solution to the problem was obtained. The result was interpreted. The general solution of the problem coincides with the solution obtained in one of the author's works for such a case only under boundary conditions of the third kind. Which indicates the reliability of the result obtained.

A series of samples of aqueous solutions with different NdCl₃ content in the range from 10 g/l to 50 g/l was created. It was found that the area under the peak at a wavelength of 576 nm is proportional to the concentration of NdCl₃ in solution. A calibration curve was constructed to determine the concentration of NdCl₃ in unknown samples. The method will be useful for analyzing the content of neodymium in scintillators used in experiments to detect double beta decay of neodymium-150.

The effect of slow hole motion on the deterioration of an n-channel MDP PT with an n+ -polysilicon gate was investigated. The influence of trapped electron release on the dynamic degradation of p-channel MDP PT following hot carrier injection into the channel is examined. It is demonstrated that the field in the oxide influences the process of restoring features, and the time dependency has a distinct non-exponential character. It is demonstrated that the injection of electrons at high voltage at the gate during the process of alternating static effects causes trapped hole recombination, and that taking into account the effects of releasing the trapped charge allows the problems of relaxation of degradation processes to be solved.

The characteristics of titanium silicide films formed using chemical gas-phase plasma-activated deposition (CGPD) have been investigated. The Si/Ti ratio in titanium silicide films is explored in relation to the SiH₄/Sicl₄ ratio, as well as the resistivity of the titanium silicide layer generated by different ways in relation to the annealing temperature in the argon Ag medium. It is demonstrated that the resistivity of titanium silicide layers obtained by the HGPO method is lowest at lower annealing temperatures, which is due to the low impurity content of the films, and that with accelerated annealing in the temperature range 600–950 °С, the Si/Ti ratio equals 2. It is shown that on the surface of titanium silicide films there can be SiO₂ was grown in H₂O vapors at 800 °C or in dry O₂ at 900–950 °С.

The work provides a rationale for what was previously proposed from the analysis of experimental isotherms of the electron work function (EWF) of solutions of binary metal systems when considering the processes occurring on a freshly formed surface. It is accepted that the contributions of surface relaxation to the EWF for ideal and real solutions have the same values.

Approaches to modeling the structure of the polymer chain and intermolecular associates in plant pectins are discussed. The influence of the structural organization of pectins and pectin-montmorillonite com- posites on the kinetic parameters of pH-controlled sorption of the test alkaloid in the digestive system of humans and farm animals has been traced. The results of the studies make it possible to predict the sorption bind- ing of azaheterocyclic compounds and to determine the dosage of pectin-containing preparations for preven- tion of mycotoxicosis.

The work is devoted to the study of synthesis processes and the study of the physico-mechanical and thermal properties of new aromatic copolyethersulfone ketones, depending on the chemical structure of diols and activated aromatic dihaloids in a simpler, more economical way. It is shown that by controlling the ratio of diphenols of activated aromatic dihaloids, as well as the order of their introduction into the copolycondensation reaction, it is possible to synthesize aromatic copolyethersulfonеketones with increased physical, mechanical and temperature parameters.

Samples of functional products created using combined (hybrid) technology using additive FDM printing and hypersonic metallization were obtained. It has been shown that the new products have improved wear resistance and are applicable as part of the main production equipment of industrial enterprises producing chemical fibers.

A series of multiblock thermoplastic polyurethanes (TPU) with different soft segments based on poly(butylene adipate) diol (PBA) has been synthesized. The phase-separated structure and mechanical properties of TPU were analyzed by FTIR spectroscopy, differential scanning calorimetry, thermal and mechanical analysis. It is shown that the TPUs based on PBA oligomer exhibit excellent mechanical properties, while the samples based on PBA macrodiol of aliphatic nature with incorporated hexamethylene diisocyanate shows increased degree of crystallinity due to a high density of hydrogen bonding network.

In this work, for the first time, comparative studies of the mechanical properties of polyetheretherketone and its copolymer based on hydroquinone and 4,4'-dihydroxybiphenyl were carried out in a wide range of test temperatures. The main regularities of the behavior of these materials in the temperature range from –65 °С to +250 °С are revealed; that the homopolymer has higher mechanical properties throughout the whole range of test temperatures. It is shown that both materials retain plasticity at low temperatures. It was found that at temperatures above 150 °C, a sharp decrease in mechanical properties occurs, which is associated with the transition of the studied materials into a highly elastic state due to the glass transition temperature.

Cardiac amyloidosis has been shown to be a disease caused by the deposition of insoluble amyloid fibrils. Drugs aimed at treating amyloidosis have a number of disadvantages, so the problem of creating new highly effective drugs is acute. The work carried out molecular modeling and docking of ultrashort peptides into target proteins of cardiac amyloidosis for subsequent peptide synthesis and analysis in animal models of amyloidosis.

The quantitative analysis of influence of two types of interactions in polymer composites (filler-filler and filler-polymer matrix) on main properties of these materials was performed. It has been shown that the intensi- fication of both indicated interaction types leads to densification of filler aggregates structure and increases reinforcement degree (or elasticity modulus) of polymer composites. The equation, allowing determination of composite properties according to the total degree of such interactions only, was proposed and calculation according to it shows good correspondence with experiment.

Size effects in chemical kinetics are of interest for technologies in which chemical synthesis occurs di- rectly in a spray. The equations are obtained in the framework of formal chemical kinetics that relate the con- centrations of reagents, the volume of drops, the initial composition of the solution, the composition of the gas- eous medium, and the rate of processes. The computer model was created on their basis. Kinetic curves are constructed for a number of second-order reactions (compounds, exchanges, condensations, polymerizations, polycondensations) that demonstrate size effects.

The purpose of this work is to study the effect of pore-forming additives on the technological properties of functional geopolymer materials for construction purposes.