Journal of Experimental and Theoretical Physics最新文献_第7页

Enhanced Third Harmonic Generation of q-Gaussian Laser Beams in Underdense Plasma: Relativistic-Ponderomotive Effects 低密度等离子体中q-高斯激光束增强三次谐波的产生：相对论-质动力效应

IF 0.8 4区物理与天体物理

Journal of Experimental and Theoretical Physics Pub Date : 2026-06-10 DOI: 10.1134/S1063776126600753

Keshav Walia

引用次数: 0

Third Harmonic Generation in Collisionless Plasma Driven by Cosh-Gaussian Laser Beams cosh -高斯激光束驱动无碰撞等离子体中三次谐波的产生

IF 0.8 4区物理与天体物理

Journal of Experimental and Theoretical Physics Pub Date : 2026-06-10 DOI: 10.1134/S1063776126600121

Keshav Walia

引用次数: 0

Optical Soliton Analysis for the (3+1)-Dimensional Sakovich Equation in Fluid Dynamics via Generalized Exponential Rational Differential Function Method 广义指数有理微分函数法分析流体力学中（3+1）维Sakovich方程的光孤子

IF 0.8 4区物理与天体物理

Journal of Experimental and Theoretical Physics Pub Date : 2026-06-10 DOI: 10.1134/S1063776125602125

Salim S. Mahmood, Muhammad Amin S. Murad

{"title":"Optical Soliton Analysis for the (3+1)-Dimensional Sakovich Equation in Fluid Dynamics via Generalized Exponential Rational Differential Function Method","authors":"Salim S. Mahmood, Muhammad Amin S. Murad","doi":"10.1134/S1063776125602125","DOIUrl":"10.1134/S1063776125602125","url":null,"abstract":"We explore optical soliton solutions to the (3+1)-dimensional Sakovich equation, one of the most widely used models in fluid dynamics which accounts for nonlinear wave propagation in multi-dimensional dispersive media. With the majority of studies done on lower-dimensional cases (including but not limited to two-dimensional), systematic analytical solutions for the (3+1)-dimensional variant remain limited, particularly those capturing diverse wave phenomena. To bridge this void, we rely on the generalized exponential rational differential function technique, a solid analytical strategy, which finds solutions between rational forms that integrate a hyperbolic and trigonometric form. Utilizing this technique with traveling wave transformations in a systematic manner, we accomplish multiple families of exact optical soliton solutions with different wave structures. The solutions obtained are compared quantitatively, demonstrated by rich 2D contours and 3D surface visualizations at various parameter ranges, highlighting the dynamical behavior of the system. The analytical solutions present critical solutions for further exploring the properties of wave behaviors in plasma physics, shallow water waves, optical fiber communications and nonlinear dispersive systems. The novel aspect of this work is that systematic generation of different solution families for the (3+1)-dimensional Sakovich equation is established using a powerful approach not used previously for this model, thus broadening the analytical toolbox for multidimensional nonlinear evolution equations and providing the core building blocks for further development of complex wave processes in fluid dynamics and nonlinear optics.","PeriodicalId":629,"journal":{"name":"Journal of Experimental and Theoretical Physics","volume":"142 3","pages":"268 - 284"},"PeriodicalIF":0.8,"publicationDate":"2026-06-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"148202933","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}

引用次数: 0

Effect of Water and Ethanol Immersion on the Thermal Conductivity of Polyethylene Fiber–Reinforced Epoxy Composites 水和乙醇浸泡对聚乙烯纤维增强环氧复合材料导热性能的影响

IF 0.8 4区物理与天体物理

Journal of Experimental and Theoretical Physics Pub Date : 2026-06-10 DOI: 10.1134/S1063776126600212

Mohanad R. Alsalmani, Yousif Sarhan, Laith Saleh Alhiti, Abd-Ulrahman Dhafer Sabah, Mudatheer M. Al-Slivani, Aws Z. Abdulmajeed

{"title":"Effect of Water and Ethanol Immersion on the Thermal Conductivity of Polyethylene Fiber–Reinforced Epoxy Composites","authors":"Mohanad R. Alsalmani, Yousif Sarhan, Laith Saleh Alhiti, Abd-Ulrahman Dhafer Sabah, Mudatheer M. Al-Slivani, Aws Z. Abdulmajeed","doi":"10.1134/S1063776126600212","DOIUrl":"10.1134/S1063776126600212","url":null,"abstract":"Polymer-based composite materials are widely used in engineering applications due to their lightweight structure and tunable physical properties. However, exposure to environmental conditions such as moisture and chemical solutions can significantly influence their thermal performance. This study investigates the effect of immersion media and reinforcing materials on the thermal conductivity of epoxy-based composites reinforced with polyethylene fibers. Composite specimens were fabricated using epoxy resin as the matrix material and polyethylene fibers as reinforcement with volume fractions of 15 and 20%. The samples were immersed in tap water and ethanol solutions for different exposure periods. Thermal conductivity measurements were performed before and after immersion to evaluate the influence of chemical absorption on heat transfer behavior. The experimental results revealed that unreinforced epoxy exhibited higher thermal conductivity than fiber-reinforced composites. Furthermore, polyethylene fiber reinforcement significantly reduced thermal conductivity due to increased phonon scattering within the polymer matrix. Water immersion led to a noticeable increase in thermal conductivity, whereas ethanol immersion resulted in a reduction of thermal conductivity values with prolonged exposure time. The findings confirm that polyethylene fibers enhance the resistance of epoxy composites to liquid absorption; however, extended immersion causes microstructural degradation that adversely affects thermal performance. These results provide useful insights for the design of polymer composite materials intended for applications under humid or chemically aggressive environments.","PeriodicalId":629,"journal":{"name":"Journal of Experimental and Theoretical Physics","volume":"142 3","pages":"227 - 233"},"PeriodicalIF":0.8,"publicationDate":"2026-06-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"148202893","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}

引用次数: 0

Field-Tunable Spin–Valley Polarized Transport in Zigzag Germanene Nanoribbons 之字形锗纳米带的场可调谐自旋谷极化输运

IF 0.8 4区物理与天体物理

Journal of Experimental and Theoretical Physics Pub Date : 2026-06-10 DOI: 10.1134/S1063776126600480

Yao Xu, Zhi-qiang Bao

引用次数: 0

Entropic Dependences of Thermal Radiation of Solid Alloys of the Iron–Cobalt System 铁-钴系固体合金热辐射的熵依赖

IF 0.8 4区物理与天体物理

Journal of Experimental and Theoretical Physics Pub Date : 2026-06-10 DOI: 10.1134/S1063776126700032

D. V. Kosenkov, V. V. Sagadeev

{"title":"Entropic Dependences of Thermal Radiation of Solid Alloys of the Iron–Cobalt System","authors":"D. V. Kosenkov, V. V. Sagadeev","doi":"10.1134/S1063776126700032","DOIUrl":"10.1134/S1063776126700032","url":null,"abstract":"The results of a study on the temperature dependences of the emissivity of Fe–Co system alloys in the temperature range of 400–1600 K are presented. Based on the Foote approximation, calculations of the normal total emissivity (εtn) have been performed using the literature data on electrical resistivity. The applicability of the approximation for pure cobalt in the solid state is shown, as well as its insensitivity to the magnetic phase transition at the Curie point. Analysis of the normalized εtn curves has made it possible to identify four concentration groups of alloys with different characteristic behavior of εtn. To interpret the obtained data, an entropic approach based on similarity theory has been employed. It has been established that in the dimensionless coordinates Πq = f(ΠS), the dependences for groups III and IV coincide, indicating the similarity of the dominant charge carrier scattering mechanisms in the high-cobalt region. The obtained results confirm the applicability of the entropic approach for classifying alloys according to their radiative characteristics and identifying the generality in the physical mechanisms of transport.","PeriodicalId":629,"journal":{"name":"Journal of Experimental and Theoretical Physics","volume":"142 3","pages":"253 - 258"},"PeriodicalIF":0.8,"publicationDate":"2026-06-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"148202895","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}

引用次数: 0

Theoretical Design and Performance Evaluation of a Hot-Mirror Optical Filter for Photovoltaic Cells 光伏电池热镜滤光片的理论设计与性能评价

IF 0.8 4区物理与天体物理

Journal of Experimental and Theoretical Physics Pub Date : 2026-06-10 DOI: 10.1134/S1063776126600303

H. S. Al-Arab, A. Z. Manshad

{"title":"Theoretical Design and Performance Evaluation of a Hot-Mirror Optical Filter for Photovoltaic Cells","authors":"H. S. Al-Arab, A. Z. Manshad","doi":"10.1134/S1063776126600303","DOIUrl":"10.1134/S1063776126600303","url":null,"abstract":"While conventional silicon photovoltaic (PV) systems suffer a performance degradation of approximately 0.5% per degree Celsius, this study investigates thin-film “hot mirror” spectral filters as a robust alternative to traditional area-scaling or unfiltered concentrated photovoltaics. Although increasing cell area or concentration provides linear gains in output, these methods fail to address the fundamental thermodynamic limitation where thermal dissipation accounts for over 50% of energy loss in single-junction devices. By implementing a simplified periodic quarter-wave stack designed without the need for complex computational optimization—such as damped least squares or needle variation—we present a film-based filter achieving 95% average transmittance. Through the application of Open Filters, SCAPS-1D, and the theoretical matrix method for performance analysis, it was determined that a silicon photovoltaic system can maintain an efficiency of 21.86% at a temperature of 50°C by selectively filtering the solar spectrum to reduce thermal absorption. This optical mechanism maintains the cell within its optimal thermal range, thus preventing voltage collapse under extreme environmental conditions.","PeriodicalId":629,"journal":{"name":"Journal of Experimental and Theoretical Physics","volume":"142 3","pages":"219 - 226"},"PeriodicalIF":0.8,"publicationDate":"2026-06-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"148202896","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}

引用次数: 0

Construction of a Predictive Model of a Nonstationary Random Process and Analysis of Its Trends and Covariance Functions 非平稳随机过程预测模型的建立及其趋势和协方差函数的分析

IF 0.8 4区物理与天体物理

Journal of Experimental and Theoretical Physics Pub Date : 2026-06-10 DOI: 10.1134/S106377612660087X

V. Yu. Stroganov, I. S. Belashova

引用次数: 0

Turn-on Times for Torsional Straining of a Lyotropic Nematic in a Magnetic Field with an Arbitrary Orientation Relative to the Director 在相对于导向器任意方向的磁场中，Lyotropic Nematic扭转应变的导通时间

IF 0.8 4区物理与天体物理

Journal of Experimental and Theoretical Physics Pub Date : 2026-06-10 DOI: 10.1134/S1063776126600492

A. V. Golovanov

引用次数: 0

Centrality-Driven Modifications of Kinetic Freeze-out Spectra at (sqrt {{{s}_{{NN}}}} ) = 62.4 GeV (sqrt {{{s}_{{NN}}}} ) = 62.4 GeV时动力学冻结光谱的中心驱动修正

IF 0.8 4区物理与天体物理

Journal of Experimental and Theoretical Physics Pub Date : 2026-06-10 DOI: 10.1134/S1063776126600091

Riyaz Ahmed Bhat, Saeed Uddin

{"title":"Centrality-Driven Modifications of Kinetic Freeze-out Spectra at (sqrt {{{s}_{{NN}}}} ) = 62.4 GeV","authors":"Riyaz Ahmed Bhat, Saeed Uddin","doi":"10.1134/S1063776126600091","DOIUrl":"10.1134/S1063776126600091","url":null,"abstract":"We present a systematic study of rapidity distributions and transverse momentum spectra of identified hadrons produced in Au+Au collisions at center of mass energy (sqrt {{{s}_{{NN}}}} = 62.4) GeV at relativistic heavy ion collider (RHIC). The available rapidity distributions of protons (p), anti-protons ((bar {p})), (bar {p}{text{/}}p), kaons (({{K}^{ + }})), anti-kaons (({{bar {K}}^{ - }})), and (bar {K}{text{/}}K) are analyzed for the most central collisions, while the transverse momentum spectra of non-strange and strange hadrons (p, (bar {p}), ({{K}^{ + }}), ({{bar {K}}^{ - }}), Lambda ((Lambda )), anti-Lambda ((bar {Lambda })), Cascade ((Xi )), anti-Cascade ((bar {Xi })), and Omega (({{Omega }^{ pm }}))) are studied over the full range of available centrality classes. The experimental rapidity and transverse momentum distributions are well reproduced within a unified statistical thermal freeze-out model incorporating simultaneous longitudinal and transverse collective expansion. The transverse size of the expanding hadronic fireball is assumed to follow a Gaussian profile along the longitudinal direction. Thermo-chemical freeze-out parameters, including the temperature, baryon chemical potential, and collective flow velocity, are extracted. The results indicate an earlier freeze-out of multi-strange hyperons compared to singly strange and non-strange hadrons throughout the system evolution. A clear centrality dependence of the freeze-out parameters is observed, with increasing kinetic freeze-out temperature and decreasing collective flow toward more peripheral collisions. Contributions from heavier hadronic resonance decays are also included in the analysis.","PeriodicalId":629,"journal":{"name":"Journal of Experimental and Theoretical Physics","volume":"142 3","pages":"240 - 246"},"PeriodicalIF":0.8,"publicationDate":"2026-06-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"148202906","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}

引用次数: 0