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Actual problems of Mathematics, Physics and Mecanics
OPTOELECTRONIC DEVICE FOR INFORMATION PROTECTION IN FIBER-OPTIC COMMUNICATION LINES
All possible unauthorized accesses to fiber-optic communication systems were analyzed, and destructive, non-destructive, and optical-radio wave methods of data collection were considered. An optoelectronic method for countering unauthorized data collection and modern technical means for...
3 September 2025, 21:50
NUMERICAL CALCULATION OF OPTIMAL DURATION AND TEMPERATURE OF DIFFUSION OF IMPURITY ATOMS OF SULFUR AND MANGANESE
The paper presents a numerical method of the diffusion process whereas duration and temperature conditions of the diffusion could be set finetuned in advance. Impurity atoms of sulfur and the transition element manganese in single-crystal silicon were selected as objects of study. Sulfur and...
3 August 2025, 21:50
STUDY OF THE PROCESSES OF TEMPERATURE MIGRATION OF IRON EXOATOM ON THE SURFACE OF FULLERENE C60 BY MOLECULAR DYNAMICS METHODS
The paper studies the dynamic process of migration of iron exoatom on the surface of free fullerene C60 using molecular dynamics methods (LAMMPS). It is found that pronounced migration of iron exoatom occurs at temperatures above 1000K. At a temperature of 1100K, jumps of the exoatom are mainly...
3 August 2025, 21:50
THE IMPORTANCE OF PHYSICAL MODELS IN SIMULATING DEGRADATION EFFECTS IN GaN NANOWIRE FETS
This article explores the critical role of physical models in simulating degradation effects in GaN nanowire field-effect transistors (NW-FETs). With the rapid advancement of nanoscale device technology, accurate prediction of electrical and radio-frequency (RF) characteristics under stress...
3 August 2025, 21:50
ON THE NEGATIVE ORDER MATRIX MODIFIED KORTEWEG-DE VRIES EQUATION WITH A SOURCE
In this paper, we integrate the negative order matrix modified Korteweg-de Vries (KdV) equation with a self-consistent source in the class of rapidly decreasing functions. We derive the temporal dependence of the scattering data of the Dirac operator....
3 June 2025, 21:50
A COMPARATIVE ANALYSIS OF HYDROGEN TECHNOLOGY DEVELOPMENT IN SOUTH KOREA AND ITS APPLICABILITY TO UZBEKISTAN
The development of hydrogen energy technologies has gained global momentum as countries seek sustainable and low-carbon alternatives to conventional fossil fuels. This paper presents a comparative analysis of hydrogen technology development in South Korea and its applicability to the emerging...
3 April 2025, 21:50
A MATHEMATICAL INVESTIGATION OF THE PROCESSES OF SALT AND MOISTURE DISTRIBUTION IN SOIL BASED ON A CROSSDIFFUSION MODEL
This paper presents a mathematical modeling approach for simulating coupled salt and moisture transport in soil using a cross-diffusion system of equations. The study highlights the relevance of salinization and the disruption of the water-salt balance in agricultural land. The developed model...
3 April 2025, 21:50
MATHEMATICAL MODELING OF THE SELF-FOCUSING EFFECT OF HIGH-INTENSITY LASER BEAMS IN A NONLINEAR DIELECTRIC MEDIUM
This article investigates the self-focusing effect of high-power laser beams in a nonlinear dielectric medium through mathematical modeling. The nonlinear Schrödinger equation (NLSE) was used as the core model and numerically solved in one-dimensional space using Python. Simulation results...
3 April 2025, 21:50
PHASE MAGNETIC TRANSITIONS IN SILICON DOPED WITH MANGANESE AT LOW TEMPERATURES
This article explores the phase magnetic transitions in silicon doped with manganese (Mn) at low temperatures. The research focuses on the mechanisms of magnetic ordering, the impact of Mn clusters on the magnetic properties of silicon, and the practical potential for spintronic devices. The...
3 November 2024, 21:50
PULSATING FLOW OF ELASTIC VISCOUS FLUID IN A FLAT CHANNEL WITH CONDUCTIVE WALLS
In this article, the equations of fluid motion are given using the rheological laws of the fluid. The equations of motion are solved using boundary conditions. The effects necessary for the movement of liquids in pipes with permeable walls were obtained. In the obtained effects, the pulse wave...
3 November 2024, 21:50