The features of using the acoustic method for accurately determining the concentration of components in two-component composite materials by measuring the speed of sound of long waves are described in this paper. Furthermore, explicit expressions for the volume concentrations of the matrix material and reinforcing particles or fibers of composite materials obtained by ...

Chalcopyrites are ternary semiconductor compounds with successful applications in photovoltaics. Certain chalcopyrites are well researched, yet others remain understudied despite showing promise. In this study, we use ab initio methods to study CuGaS2 , AgGaS2 , and CuGaSe2 chalcopyrites with a focus on their less studied solid solutions. We use density functional theory (DFT) ...

The paper studies the problems of developing interconnected models of aggregates of complex chemical-technological systems (CTS) in conditions of scarcity and fuzziness of the initial information. Since the known methods of model development do not allow for solving these problems, we propose a systematic method that allows the development of a package of models of interconnected ...

This paper focuses on the problem of global practical output tracking for a class of high-order non-linear systems with time-varying delays (via state feedback). Under mild growth conditions on the system nonlinearities involving time-varying delays, we construct a state feedback controller with an adjustable scaling gain. With the aid of a Lyapunov–Krasovskii functional, ...

A method for simultaneous processing of stepped holes in the bedding of a submersible pump and the boring bar design is proposed. The results of the study of existing methods for processing stepped holes and the design of boring tools are presented. It was revealed that the considered methods and designs of tools cannot be used for processing stepped holes in the submersible ...

Geoinformation systems, as teaching tools in education, are closely linked to interdisciplinary and natural sciences. Currently, the application of geoinformation systems (GIS) in the educational process holds great potential for higher education. This paper presents a pedagogical system for teaching and learning a GIS course, along with a wide range of information sources that ...

This study aimed to assess the impact of gamified educational resources on students’ motivation to learn the Python programming language. The study utilized the CheckiO gaming platform to diagnose the needs and motivations of students in developing knowledge, skills, and abilities related to the use of gamified educational resources. A total of 83 students from a university in ...

The article analyzes the analytical and numerical solutions of heat conduction under the theory of inhomogeneous bodies. The distribution of sub-zero temperature in an inhomogeneous half-space and accounting for the continuous inhomogeneity of the heat conduction rate and internal heat dissipation sources are given for the first time. The evaluation of the obtained results ...

The aim of the work is a complex of studies of the operation of driven piles in the presence of loads. To achieve this goal, the following tasks were set: to analyze theoretical and experimental data in the field of driven pile research; carrying out a calculated assessment of the capabilities of driven piles according to regulatory documents; comparison of comparative ...

There are presented the results of an experimental study of the strength of compressed reinforced concrete elements with polymer-reinforced plastics FIBARM TAPE 530/300. Reinforcement of compressed reinforced concrete elements with cages made of fiberreinforced plastics causes triaxial compression in concrete, in which the strength of the elements can increase several times. ...