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Actual problems of Mathematics, Physics and Mecanics
QUASI-PHASE-MATCHED FREQUENCY CONVERSION OF FEMTOSECOND PULSES IN PERIODICALLY STRUCTURED GaN CRYSTALS
The frequency doubling process resulting from the nonlinear interaction of ultrashort laser pulses in nonlinear photonic crystals modulated with second-order nonlinear admittance was studied based on numerical modeling. The effects of linear absorption in the infrared spectral range and third-order...
3 January 2026, 22:00
FORMATION ENERGY AND PHASE STABILITY OF A SOLID SOLUTION OF MOLECULAR SUBSTITUTION BASED ON Si AND GaP
The integration of III–V semiconductors into silicon technology remains one of the key challenges for the development of efficient silicon-based optoelectronic devices. In this work, the thermodynamic stability and phase stability of a continuous solid solution (Si₂)₁₋ₓ(GaP)ₓ formed via molecular...
3 December 2025, 22:00
EVALUATION OF C20@Cn and C60@Cn (n=1, 3) EXOFULLERENES ADSORBED ON THE SILICON Si(100)2×1 SURFACE IN TERMS OF TIME PARAMETERS IN THE ABSENCE OF FULLERENE ADSORPTION
In this research work, the temperature dependence (T...
3 November 2025, 22:00
MODELING THE INTERACTION PROCESSES OF FULLERENE C₂₀ WITH GRAPHENE
The study investigated the interaction of C20 fullerene with graphene using molecular dynamics simulations (LAMMPS). It was found that after a collision, a C20 fullerene molecule does not immediately bounce off the graphene surface, but instead adheres to it, forming adsorption. Furthermore, when...
3 October 2025, 21:50
ANALYSIS OF CONDUCTION CURRENT AND DISPLACEMENT CURRENT IN THE CHARGING AND DISCHARGING PROCESS OF A CAPACITOR
This article seeks to address complex and problematic questions encountered in the physics practicum exercise “Studying the Charging and Discharging Process of a Capacitor.” Another important aspect is ensuring that students understand this laboratory work not only theoretically but also through...
3 September 2025, 21:50
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