Journal of Experimental and Theoretical Physics最新文献

{"title":"Rational Design of Dy2O3-Doped Bi2O3–B2O3–K2O Radiation Shielding Glasses through Alkaline-Earth Modifier (MgO, ZnO, or BaO) Engineering: Structural Speciation Analysis and Mechanical Property Optimization","authors":"Abely E. Mwakuna,&nbsp;Awadhi Shomari","doi":"10.1134/S1063776126600996","DOIUrl":"10.1134/S1063776126600996","url":null,"abstract":"<p>This study explores the role of MgO, ZnO, and BaO additions in tuning the structural features and radiation shielding efficiency of Dy³⁺-doped B₂O₃–Bi₂O₃–K₂O glasses fabricated by melt quenching, with emphasis on photon energies corresponding to Cs-137, Co-60, and Na-22 sources. The parent composition (64.5 B₂O₃–15 Bi₂O₃–20 K₂O–0.5 Dy₂O₃, mol %) was modified by substituting 10 mol % of B₂O₃ with MgO, ZnO, or BaO. The density increased from 4.07 g cm^–3 in the Mg-containing glass to 4.21 g cm^–3 in the Ba-containing sample, indicating a clear enhancement. By using XRD, infrared spectroscopy, UV–Vis tests, and computational modeling, the relationship between structural changes and functional performance was systematically examined. The results indicate that by enhancing [BO₄] formation with its potent charge compensation, the inclusion of Mg²⁺ enhanced the network’s integrity, resulting in improved mechanical strength (elastic modulus = 103 GPa; shear modulus = 41 GPa). In contrast, although Ba²⁺ reduces mechanical strength, it provides superior radiation shielding performance, requiring only a 0.433 cm half-value layer at 0.284 MeV. While the radiation shielding properties vary across the prepared glasses, each composition demonstrates improved performance relative to conventional tellurite- and lanthanum oxide-based glasses, underscoring the role of precise compositional design in achieving multifunctionality. The results confirm that all prepared glasses have potential as radiation shielding materials, with the Mg²⁺-containing composition being particularly well-suited for uses demanding superior mechanical strength and structural robustness.</p>","PeriodicalId":629,"journal":{"name":"Journal of Experimental and Theoretical Physics","volume":"142 5","pages":"659 - 670"},"PeriodicalIF":1.0,"publicationDate":"2026-09-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"149014607","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"On the Dependence of Stokes Force and Reynolds Number on Surface Finish Class","authors":"S. O. Gladkov","doi":"10.1134/S106377612670010X","DOIUrl":"10.1134/S106377612670010X","url":null,"abstract":"<p>Based on general physical principles, mathematical criteria are formulated, under which it is possible to implement the condition for adhesion of the flow of a viscous liquid to the surface of the body taking into account its roughness. The criterion of net flow slippage along the surface is given. The calculations are carried out using the Navier–Stokes equation. Taking into account the roughness, a correction to the Stokes formula describing the drag of the ball is obtained.</p>","PeriodicalId":629,"journal":{"name":"Journal of Experimental and Theoretical Physics","volume":"142 5","pages":"683 - 688"},"PeriodicalIF":1.0,"publicationDate":"2026-09-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"149014603","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Acoustic-Induced Atomization of a Sessile Droplet on Hydrophobic, Hydrophilic, and Hybrid Surfaces via Fully Compressible VOF Simulation","authors":"Nasim Pooladvandi,&nbsp;Hamid Saffari","doi":"10.1134/S1063776126600285","DOIUrl":"10.1134/S1063776126600285","url":null,"abstract":"<p>This study numerically investigates the non-contact atomization of a sessile droplet subjected to acoustic excitation from the gaseous phase. A fully compressible two-phase geometric Volume of Fluid (VOF) solver was developed within the OpenFOAM (Open-source Field Operation and Manipulation) framework to resolve the coupled dynamics of sound-wave propagation, interface deformation, and droplet breakup. Acoustic radiation from the gas side induces surface instabilities on the droplet, leading to the ejection of smaller secondary droplets. The effects of substrate wettability—hydrophilic, hydrophobic, and hybrid (hydrophilic–hydrophobic)—and excitation frequency (200, 300, and 400 kHz (kilohertz)) were systematically examined. Results show that increasing the excitation frequency shortens surface wavelength, accelerates the onset of atomization, and decreases the atomization threshold time by approximately 26% on hybrid and 20% on hydrophilic surfaces, while remaining nearly unchanged on the hydrophobic surface. Higher excitation frequencies also produce finer atomized droplets: increasing the frequency from 200 to 400 kHz reduces the mean droplet size by about 14% on the hybrid surface, 11% on the hydrophobic surface, and 32% on the hydrophilic surface. Overall, the hybrid surface led to the production of finer droplets compared to the other two.</p>","PeriodicalId":629,"journal":{"name":"Journal of Experimental and Theoretical Physics","volume":"142 5","pages":"557 - 576"},"PeriodicalIF":1.0,"publicationDate":"2026-09-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"149014591","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Modeling of Oscillations in Transient Biophysical Processes with Induced Quantum Excitation","authors":"A. Yu. Perevaryukha","doi":"10.1134/S106377612670007X","DOIUrl":"10.1134/S106377612670007X","url":null,"abstract":"&lt;p&gt;The article proposes methods for modeling processes during the propagation of perturbations in heterogeneous and evolving contact media based on physical analogies. Waves from impulsive perturbations possessing entropy and the quantum uncertainty effect draw biophysical systems out of balance and disrupt homeostasis mechanisms. To describe variants with the generation of nonlinear trigger and threshold effects, we propose original methods of scenario modeling for situations based on analysis of patterns of differences in dynamics. Transient spatial processes are accompanied by peak forms of activity. Due to the internal co-evolution of counterparties, rare sporadic maxima alternate with long-term minima of intensity; therefore, the peaks of process activity appear unexpected. Sudden surges act very differently in biophysical systems with adaptive resistance and in network social communications. The bursts often appear random and unrelated. We have modeled the intermittent activity of a long-term epidemic process, invasion, or information hype divided into several stages. The nonstationarity of oscillations is demonstrated by a comparison of a series of COVID-19 epidemic waves in the United States, Japan, and Australia. We have shown that rapid impulsive effects of triggering transient oscillatory processes are realized similarly in many situations and for different phenomena. It is noted that wave attenuation and staging are qualitatively different. Series of peaks are observed during epidemic bursts of influenza and waves of coronavirus infections, recurrent infectious diseases, aggressive invasions of aliens, and information attacks on telecommunications systems, but the situations end differently. The periodic destruction of their habitat creates a cyclical pattern in the populations of Taimyr’s mammals. Invasive species develop a series of alternating transient regimes with activity surges and damped population oscillations, and their dynamics are often similar to a series of COVID waves. The article confirms that COVID-19 wave attenuation scenarios in different regions are classified into several different types. It is rational to model the coronavirus pandemia as a description of successively changing regional spread modes. We propose to classify change scenarios and assess the likelihood of their implementation. The approach is developed based on particular model scenarios, which can include control logic and regulation algorithms. We are developing a modeling methodology based on hybrid redefinable computing structures. Methods for forming a model for analysis of crisis oscillating biophysical processes such as epidemics or biological invasions must imply the eventful nature of changes in their dynamic regimes. We take into account the ability to transform the characteristics of oscillations. Several variants of models for triggering impulsive processes with properties that are not preserved in time are considered based on equations wi","PeriodicalId":629,"journal":{"name":"Journal of Experimental and Theoretical Physics","volume":"142 5","pages":"704 - 717"},"PeriodicalIF":1.0,"publicationDate":"2026-09-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"149014594","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Simulation-Based Analysis of Security Modulation in Free-Space Optical Communication Systems","authors":"Esraa K. Al-Gazzi,&nbsp;Amany Akram Awaad,&nbsp;Esraa A. Hassan,&nbsp;Ali Zamil Manshad","doi":"10.1134/S1063776126600674","DOIUrl":"10.1134/S1063776126600674","url":null,"abstract":"<p>The security analysis of free-space optical (FSO) communication systems is an important field that requires further research and development efforts. By simulating these systems and implementing appropriate security measures, their security and reliability can be enhanced. This study aims to analyze the performance and security of FSO communication systems using chaotic modulation techniques, relying on advanced simulations conducted using OptiSystem and MATLAB. Although numerous studies have focused on improving the performance of FSO systems, few have addressed security aspects, particularly through the use of chaotic modulation as a cryptographic method. This study presents a comprehensive simulation model of an FSO system that uses nonlinear chaotic modulation to encode optical signals. It investigates the impact of light fog on system performance and analyzes key metrics, including the bit error rate (BER) and signal-to-noise ratio (SNR). The results demonstrate that chaotic modulation significantly improves security, reduces the risk of interception, and maintains robust performance even under adverse weather conditions, compared to conventional modulation systems. This work represents a step forward toward developing more secure and reliable optical communication systems and proposes the integration of these encryption techniques into critical applications that require high levels of data protection.</p>","PeriodicalId":629,"journal":{"name":"Journal of Experimental and Theoretical Physics","volume":"142 5","pages":"537 - 545"},"PeriodicalIF":1.0,"publicationDate":"2026-09-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"149014583","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"A Systematic Study of Composition-Dependent Band Offsets at Strained (In)GaAs(N)/GaAs Heterointerfaces for Optoelectronic Applications","authors":"A. Bhouri","doi":"10.1134/S1063776126600662","DOIUrl":"10.1134/S1063776126600662","url":null,"abstract":"<p>The values of band offsets in lattice-matched and pseudomorphically strained In_<i>x</i>Ga_1–<i>x</i>As_1–<i>y</i>N_<i>y</i>/GaAs (001) heterointerfaces, with different indium <span>(left( {0 leqslant x leqslant 1} right))</span> and low nitrogen compositions <span>(~left( {0 leqslant y leqslant 0.05} right))</span>, have been calculated on the basis of the Model Solid Theory. Our obtained results reveal that conduction and valence band states are significantly influenced as indium composition is changed, while nitrogen incorporation affects more the conduction band than the valence band. In fact, with increasing N composition, a dramatic conduction band energy change is reported, while the valence band offset varies weakly, about 20 meV per nitrogen concentration in %. Additionally, our results suggest a type II band lineup for both GaAs_1‒<i>y</i>N_<i>y</i>/GaAs and lattice matched In_<i>x</i>Ga_1–<i>x</i>As_1–<i>y</i>N_<i>y</i>/GaAs heterojunctions. The type I alignment in strained In_<i>x</i>Ga_1–<i>x</i>As_1–<i>y</i>N_<i>y</i>/GaAs is found to be achieved at relatively high In molar fraction and very low nitrogen compositions. Detailed information and results derived from this study will contribute in designing novel systems in a spectral range of high importance for optoelectronic devices including photodetectors, light emitters and more especially multijunction solar cells.</p>","PeriodicalId":629,"journal":{"name":"Journal of Experimental and Theoretical Physics","volume":"142 5","pages":"546 - 556"},"PeriodicalIF":1.0,"publicationDate":"2026-09-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"149014584","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Aminosilane-Modified Multiwalled Carbon Nanotubes and Their Influence on the Mechanical Performance and Swelling Characteristics of Ethylene Propylene Diene Monomer/Styrene Butadiene Rubber Blend Systems","authors":"S. Vishvanathperumal,&nbsp;K. N. Ramu","doi":"10.1134/S1063776126600558","DOIUrl":"10.1134/S1063776126600558","url":null,"abstract":"<p>Multi-walled carbon nanotubes (MWCNTs) were initially acid-treated and subsequently functionalized with 3-aminopropyltriethoxysilane (APTES), a widely used silane coupling agent, to enhance interfacial compatibility with the rubber matrix. This study investigates the influence of both pristine CNTs and APTES-functionalized CNTs (sCNTs) on the performance of vulcanized EPDM/SBR blend composites. The properties evaluated include curing characteristics, mechanical performance, abrasion resistance, compression set, crosslink density, and solvent swelling resistance. Rheological analysis revealed that increasing CNT and sCNT loading reduced scorch time and optimum cure time, while minimum torque, maximum torque, torque difference, and cure rate index increased. These changes are attributed to improved filler–rubber interactions, particularly in sCNT-filled systems, which promote more efficient crosslink network formation. Mechanical testing showed significant improvements in tensile strength and stress at 100% elongation up to 5 phr sCNT loading. Beyond this level, the reinforcing effect plateaued or slightly decreased due to intensified filler–filler interactions, which restrict effective stress transfer. In contrast, other properties such as tear strength, hardness, abrasion resistance, compression set, crosslink density, and swelling resistance continued to improve with increasing sCNT content. Overall, APTES-functionalized CNTs exhibited superior reinforcing efficiency compared to pristine CNTs. Compared to the unfilled blend, CNT-filled composites showed improvements of 99% in tensile strength, 29% in stress at 100% elongation, and 73% in tear strength, whereas sCNT-filled systems exhibited even higher enhancements of 144, 40, and 109%, respectively, confirming the effectiveness of surface functionalization in optimizing composite performance.</p>","PeriodicalId":629,"journal":{"name":"Journal of Experimental and Theoretical Physics","volume":"142 5","pages":"597 - 621"},"PeriodicalIF":1.0,"publicationDate":"2026-09-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"149014599","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Controllability of Magnetic Effects during Scattering of Circularly Polarized Waves on Graphene Metasurfaces in a Transverse Magnetic Field in the THz and Far-IR Ranges","authors":"G. S. Makeeva,&nbsp;M. S. Nikitin","doi":"10.1134/S1063776126700081","DOIUrl":"10.1134/S1063776126700081","url":null,"abstract":"<p>Using the CST MWS software of electrodynamic simulation, numerical analysis has been performed for magnetic effects emerging under diffraction of circularly polarized waves on an anisotropic graphene metasurface in a transverse magnetic field and their controllability depending on the magnitude of the external magnetic field, the graphene Fermi energy, and the angle of wave incidence in the THz and far-IR ranges. The electrically and magnetically controlled absorption spectra of circularly polarized waves with left- and right-polarization for the normal and oblique incidence on an anisotropic graphene metasurface and the magnetic circular dichroism (MCD) spectra for different combinations of applied magnetic and electric fields have been calculated and the controllability of the MCD effect by the external magnetic field upon the change in graphene Fermi energy <i>E</i>_F (by an external electric field) to optimal values of <i>E</i>_F = –0.2 eV has been demonstrated.</p>","PeriodicalId":629,"journal":{"name":"Journal of Experimental and Theoretical Physics","volume":"142 5","pages":"699 - 703"},"PeriodicalIF":1.0,"publicationDate":"2026-09-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"149014593","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Phase Transitions in Disordered Nondissipative Systems: A Classical Analog of Quantum Transitions","authors":"V. Arkhincheev","doi":"10.1134/S1063776126601230","DOIUrl":"10.1134/S1063776126601230","url":null,"abstract":"<p>This paper investigates percolation transitions in a disordered systems composed of inductors and capacitors (nondissipative reactive elements). These transitions occur between different percolating states, resulting in distinct, constant values of the effective conductivity. We employ an exact approach based on the rotational symmetry of two-dimensional DC equations. A new type of phase transition is identified for these nondissipative systems by analogy to a topological transition. The characteristics of these transitions, which are analogs of topological invariants, are calculated. We propose that these transitions may be considered a classical analog to quantum transitions, such as the quantum Hall effect.</p>","PeriodicalId":629,"journal":{"name":"Journal of Experimental and Theoretical Physics","volume":"142 5","pages":"638 - 644"},"PeriodicalIF":1.0,"publicationDate":"2026-09-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"149014586","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Role of Plasmonics in Solar Cell Architecture: A Short Review","authors":"Nilima Gogoi","doi":"10.1134/S1063776126600807","DOIUrl":"10.1134/S1063776126600807","url":null,"abstract":"<p>The exponential decay of fossil fuel resources over the decades has necessitated the use of alternative clean, green and renewable energy sources. Solar energy is the most widely used renewable energy source due to its easy availability and vast irradiation area. The solar cells have been extensively used as a suitable device for conversion of solar energy to electrical energy. The integration of plasmonic nanostructures in solar cell devices have successfully addressed the various limitations of conventional solar cells and achieved improved light confinement in the active layer and increased optical path length, leading to increase in the overall energy conversion. This article provides a brief discussion on the use of plasmonics based architectures in solar cell devices in order to achieve improved efficiency of these devices.</p>","PeriodicalId":629,"journal":{"name":"Journal of Experimental and Theoretical Physics","volume":"142 5","pages":"677 - 682"},"PeriodicalIF":1.0,"publicationDate":"2026-09-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"149014592","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}