The article is devoted to the study of frictional wear of structural carbon plastics based on phenylene and ultrahigh molecular weight polyethylene. A monotonous increase in the intensity of frictional wear was found with an increase in the parameter characterizing the level of shear stability of polymer composites. It is shown that the resistance of the polymer matrix to shear deformation is a universal characteristic used to describe the process of frictional wear of polymer materials. The results obtained in the work will allow us to develop a methodology for predicting the intensity of frictional wear as a function of pressure and sliding velocity.

A structural model is considered that allows us to determine the dependence of the fire resis- tance of polymer/carbon nanotube nanocomposites on a fundamental structural characteristic – the Hurst ex- ponent. This characteristic demonstrates the decisive influence of the structural state of the nanocomposite, expressed by the structural state of carbon nanotube aggregates, on the combustion process of these nanomate- rials. The Hurst exponent is easily controlled by varying the carbon nanotube content.

A study was conducted on the dependence of the growth rate, etching rate, breakdown voltage, and density of silicon dioxide films on the percentage of silane SiH₄ in the gas mixture for different temperature values. It was shown that with increasing deposition temperature and silane content in the gas mixture, the density of silicon dioxide films increases and their stoichiometry improves. The application of silane pyrolysis in the presence of carbon dioxide (as an oxidizer) allows the formation of silicon dioxide films on silicon sub- strates that are identical to thermally grown oxide.

Structural and phase changes in lead telluride with cadmium sulfide additives have been studied. It has been shown that the crystal structures and lattice parameters of the molecules forming new phases change. The higher the concentration of these impurity atoms, the larger the lattice parameter a for the CdTe phase with the sphalerite structure. As the concentration of cadmium sulfide increases, new three-component phases without lead content are formed, which can be represented as a solid solution with variable composition.

The study tested various methods for producing silver halide microcrystals of varying cuts. The resulting flat microcrystals were analyzed.

A method for preparing and studying the elemental composition of biological materials using X-ray photoelectron spectroscopy has been developed. The possibility of measuring radionuclide content in biological materials using low-background gamma spectrometry has been demonstrated.

Freshwater cladocerans were shown to be able to survive and reproduce for long periods of time, feeding on detritus of various origins. The nutritional value of detritus was determined based on the growth and reproduction rates of the aquatic organisms. The results indicate that the caloric value of detritus of various origins depends on its age.

Seasonal studies of the dispersed aquatic environment and monitoring of the Cherek-Bezengi River’s quality were conducted, based on the content of heavy metals and their compounds, to assess its use as drinking water and for food production. The Cherek-Bezengi River was found to be moderately polluted, with manganese and some metal compounds exceeding permissible concentrations throughout its course, while nitrogen and its compounds were within acceptable limits. These results allow the river’s water to be recommended for use only after treatment.

The article investigates the effectiveness of various complexing agents for stabilizing active chlorine in sodium hypochlorite solutions. It is shown that traditional stabilizers, such as sodium gluconate, do not provide long-term stability, while phosphonate complexones and polycarboxylates significantly inhibit the decomposition of hypochlorite. The composition with the copolymer of acrylic acid and 2-acrylamido-2-methylpropanesulfonic acid demonstrated the highest stability over 90 days, with a loss of active chlorine of only 1,65 %.

This article provides a literature review and summarizes information on the synthesis of polyesterimides. Systematizes modern methods of synthesis of polyesterimides and analyzes their properties, which creates a scientific basis for the development of heat-resistant composite materials of a new generation.

Solvent-free acylation of chitosan with cinnamic acid was performed under shear stresses in a twin-screw extruder. At 100 °C, varying the chitosan-to-cinnamic acid molar ratio (1:0.5, 1:1, 1:1.5) yielded derivatives with degree of substitution values ranging from 0.05 to 0.21. Fourier-transform infrared spectroscopy revealed that the solid-state reaction proceeds via two pathways, involving both ionic and covalent bonding of the acid or its residues to the amino groups of the polymer.

This study presents the first comprehensive investigation of the luminescent properties of europium(III) complexes with ofloxacin (OF). Optimal conditions for the formation of stable luminescent complexes, including pH and reagent concentrations, were determined. It was established that in the presence of ofloxacin, intense sensitized luminescence of Eu³⁺ ions is observed, caused by efficient energy transfer from the ligand to the central ion. A system- atic study of the influence of f- and d-element ions on the luminescent characteristics of the system was conducted, enabling an assessment of its selectivity and stability against interfering influences. The results of the work are of fundamental importance for understanding the processes of complex formation and energetic interactions of lanthanides in microheterogeneous environments, as well as of practical prospects for the development of new luminescent probes and analytical methods based on sensitized fluorescence of europium.

The influence of climate change on the activation of dangerous slope processes in mountainous areas is studied on the example of the village of Khabaz. A tendency of progressive intensification of destructive processes due to increased precipitation intensity is revealed.

The article discusses the prospects for using a complex based on unmanned aerial vehicles (UAVs) and specialized software for monitoring the dynamics of hazardous natural objects in mountainous conditions. Using the tailings storage facility of the Tyrnyauzsky Mining and Processing Plant as an example, the article demonstrates the possibility of assessing spatial and temporal changes in the relief with high accuracy.