Vol 9, No 4 (2022)

Ion implantation is the basis of many technological processes in electronics and microelectronics. The main quantities characterizing the penetration of ions into a solid are as follows; the length of the path of the ion until it stops completely, the average value of the projection of the total path on the direction of motion R̅p, and the average normal deviation of the projection of the path ΔR̅p. To calculate these values, computer programs SRIM, TRIM, and DYNE have been created, which require installation on a personal computer and occupy a large amount of hard disk space, which is not always justified in engineering practice. This paper describes an algorithm for a simple, installation-free program for calculating R̅p and ΔR̅p. The program algorithm is based on the Lindhard-Scharff-Schiott theory.

The article presents a variant of the development of an automated information system for mathematical modeling of the movement of a high-speed small-sized body based on differential equations and approximation of the trajectory of a high-speed small-sized body by numerical methods, as well as a comparative analysis of various options for numerical solutions. The automated information system allows calculating the flight trajectory coordinates of a high-speed small-sized body based on a differential equation, as well as determining the flight trajectory coordinates by the Euler method, using the Newton interpolation polynomial and the Lagrange interpolation polynomial. In the article, a search for a suitable variant of numerical solutions is carried out, as well as calculations of the movement of a high-speed small-sized body under conditions of limited time for decision-making. The substantiation of the use of an automated information system to automate the calculation and analysis of the movement of a high-speed small-sized body is carried out. While designing an automated information system for calculating and analyzing the flight of a high-speed small-sized body, it is proposed to apply four modules for calculating the flight trajectory of a high-speed small-sized body by numerical methods and a module for comparative analysis and making the results of the optimal variant. The proposed automated information system should provide users with uninterrupted operation, a convenient interface, the required system response time to a request, and the creation of necessary reports. The reports should reflect all types of calculations, as well as a comparative analysis with the choice of the optimal option for calculating the flight path of a high-speed small-sized body. An automated information system is needed to improve the quality of calculations and analysis of movement in the development of new and modernization of existing small arms.

The purpose of this research work is to review the existing literature on methods and solutions to the problem of efficient storage and processing of semi-structured semantic information, including in the field of product knowledge management. At the beginning of the article, the rationale for the relevance of the study is given, then it discusses possible ways to build an ontology of semantic networks, various types of knowledge representation, a stack of possible technologies on which such networks can potentially be implemented. An explanation of the semantics, ways to search for information in such systems, including an overview of the semantic data query languages used, as well as ready-made implementations of knowledge bases, is given. The result of the research work was the creation of an extensive database of analyzed sources, which raises the problem of processing semi-structured heterogeneous data, as well as searching for information on them. In addition, as a result of the study, the most effective solution to the above problem was derived - the construction of an ontology of knowledge, the representation of knowledge within the ontology, semantic networks and their architecture, and implementation. Finally, the author managed to prove a high degree of relevance of further qualitative and in-depth scientific research on the problem considered in the research work.

The universal joint or Hooke joint, or U-joint is the main unit of the cardan transmission, which consists of two joints connected by an intermediate shaft. Cardan gears are widely used in various industries when creating machines with power transfer from the output shaft of the gearbox to the crank shaft in the absence of their coaxiality. A sufficiently large number of works are devoted to the study of the kinematics of the universal joint, and there are no works on its dynamics. Such a description became possible due to the use of matrix and quaternion formalism in describing the movement of the universal joint. In this paper, a complete description of the kinematics of the universal joint in its working cycle in terms of analogues of angular velocities is obtained and, on this basis, the dynamics of the joint is studied, taking into account its inertial characteristics. It is shown that taking into account the inertial characteristics of the U-joint cross can lead to a significant increase in the magnitude of the torque, the effectiveness on the spikes, in contact with the fork of the driven shaft.

The paper considers the features of the formation of the resulting field of spurious electromagnetic radiation at informatization objects, taking into account the multipath propagation of radio waves, evaluates the achievable error values for determining the attenuation coefficient using known methods for determining the attenuation of the field of spurious electromagnetic radiation based on a deterministic model of radio wave propagation inside the building. The need for a significant refinement of the method for determining the attenuation coefficient is shown, since, in a known form, it is suitable only for measurements in free space and gives very significant errors in urban conditions and inside buildings, or the use of adaptive reception methods when receiving signals (for example, diversity reception), which allows to significantly reduce the level of interference dips in the resulting electromotive force.