Brazilian Journal of Physics最新文献_第8页

Head-on Collision of Ion Acoustic Waves in Electron-Ion-Positron Plasmas with Trapped-Distributed Electrons 电子-离子-正电子等离子体中离子声波与被困分布电子的正面碰撞

IF 1.5 4区物理与天体物理

Brazilian Journal of Physics Pub Date : 2024-11-30 DOI: 10.1007/s13538-024-01662-0

Alireza Abdikian, Uday Narayan Ghosh, Mohamad Eghbali

{"title":"Head-on Collision of Ion Acoustic Waves in Electron-Ion-Positron Plasmas with Trapped-Distributed Electrons","authors":"Alireza Abdikian, Uday Narayan Ghosh, Mohamad Eghbali","doi":"10.1007/s13538-024-01662-0","DOIUrl":"10.1007/s13538-024-01662-0","url":null,"abstract":"<div>This study examines the head-on collision of ion-acoustic solitons in a one-dimensional, hot, collisionless electron-positron-ion (e-p-i) plasma, incorporating mobile ions, (kappa )-distributed trapped electrons, and Maxwellian positrons. Using the modified Poincare-Lighthill-Kuo (PLK) method, we derive modified Korteweg-de Vries (mKdV) equations and analyze phase shifts in soliton trajectories post-interaction. Results reveal that only rarefactive electrostatic nonlinear waves can propagate within the range of parameters relevant to experiments, showing symmetrical soliton behavior during head-on collisions, with identical amplitude and width. Additionally, soliton amplitude is found to decrease as the electron spectral index ((kappa _e)) and positron-to-electron temperature ratio ((beta _e)) increase, with a sharp decline observed within the range (0<kappa _e<5). Phase shift analysis shows that smaller (kappa _e) values result in a steady increase in phase shifts, which becomes asymptotic as (kappa _e) grows, while phase shifts decrease with rising (sigma _i) (temperature ratio of ions to electrons). These results have practical applications in astrophysical and laboratory plasma environments where soliton interactions play a crucial role. Understanding head-on soliton collisions helps predict plasma behavior in environments such as the interstellar medium, fusion devices, and space plasmas, where wave stability, energy transport, and plasma heating are influenced by nonlinear interactions in systems with trapped particles and nonthermal distributions.</div>","PeriodicalId":499,"journal":{"name":"Brazilian Journal of Physics","volume":"55 1","pages":""},"PeriodicalIF":1.5,"publicationDate":"2024-11-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142754303","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

Entropy Production Along a Deterministic Motion 沿着确定性运动产生熵

IF 1.5 4区物理与天体物理

Brazilian Journal of Physics Pub Date : 2024-11-30 DOI: 10.1007/s13538-024-01664-y

Mário J. de Oliveira

引用次数: 0

Variable-Sized Dust Grains and Hybrid Cairns-Tsallis-Distributed Electron Effects on Collision Dynamics of Dust Acoustic Waves in Saturn’s Dusty Plasma 变大小尘埃颗粒和混合凯恩斯-萨利斯分布电子对土星尘埃等离子体中尘埃声波碰撞动力学的影响

IF 1.5 4区物理与天体物理

Brazilian Journal of Physics Pub Date : 2024-11-29 DOI: 10.1007/s13538-024-01651-3

Eman Mohammed El-Bayoumi, M. Abd-Elzaher, Kottakkaran Sooppy Nisar, Mona Mahmoud, A. Atteya

{"title":"Variable-Sized Dust Grains and Hybrid Cairns-Tsallis-Distributed Electron Effects on Collision Dynamics of Dust Acoustic Waves in Saturn’s Dusty Plasma","authors":"Eman Mohammed El-Bayoumi, M. Abd-Elzaher, Kottakkaran Sooppy Nisar, Mona Mahmoud, A. Atteya","doi":"10.1007/s13538-024-01651-3","DOIUrl":"10.1007/s13538-024-01651-3","url":null,"abstract":"<div>The overtaking collision of dust acoustic waves (DAWs) featuring electrons distributed according to a hybrid Cairns-Tsallis model and Boltzmann-distributed ions is investigated in this paper. The Korteweg de Vries (KdV) equation, which permits rarefactive DAWs, is the result of nonlinear research of the plasma system utilizing the reductive perturbation approach. Using Hirota’s bilinear method, the overtaking interaction between two and three-soliton solutions is examined. Physical factors that affect the overtaking collisions and change the dynamics of the solitons include electron density, dust radius ratio, and nonextensive parameters. Interestingly, the solitons amplitude and width grow when the electron density and dust radius ratio rise or the nonextensivity falls. In addition, the system’s properties have an impact on the phase alterations of the solitons. The information offered here may be useful for the investigation of DAWs in dusty space plasmas, including cometary environments, the F and G rings of Saturn, and laboratory plasmas with nonthermal nonextensive electrons.</div>","PeriodicalId":499,"journal":{"name":"Brazilian Journal of Physics","volume":"55 1","pages":""},"PeriodicalIF":1.5,"publicationDate":"2024-11-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142753956","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

Er–Mg–Cu Ferrite Nanoparticles: a Synergetic Effect of Rare Earth RE-Er3+ on Enhanced Surface Morphological, Optical, and High-Temperature Electrical Properties 铒镁铜铁氧体纳米粒子：稀土 RE-Er3+ 对增强表面形态、光学和高温电学特性的协同效应

IF 1.5 4区物理与天体物理

Brazilian Journal of Physics Pub Date : 2024-11-27 DOI: 10.1007/s13538-024-01654-0

G. Vinod, M. Bhanu, D. Mallesh, K. Rajashekhar, D. Ravinder, Noha Ahmed Elayah, A. Nagarjuna, G. Sunitha, J. Laxman Naik

{"title":"Er–Mg–Cu Ferrite Nanoparticles: a Synergetic Effect of Rare Earth RE-Er3+ on Enhanced Surface Morphological, Optical, and High-Temperature Electrical Properties","authors":"G. Vinod, M. Bhanu, D. Mallesh, K. Rajashekhar, D. Ravinder, Noha Ahmed Elayah, A. Nagarjuna, G. Sunitha, J. Laxman Naik","doi":"10.1007/s13538-024-01654-0","DOIUrl":"10.1007/s13538-024-01654-0","url":null,"abstract":"<div>Mg0.5Cu0.8ErxFe2−xO4 (through x = 0.000, 0.005, 0.010, 0.015, 0.020, 0.025 and 0.030) A series of rare earth (Er3+)-doped magnesium-copper nanoparticles with the general chemical compositions of Mg0.5Cu0.8ErxFe2−xO4 (through x = 0.000, 0.005, 0.010, 0.015, 0.020, 0.025 and 0.030) was fabricated by citrate sol–gel auto combustion technique. The fabricated materials are investigated through XRD, FE-SEM, EDS, TEM, FTIR, UV–Vis, DC resistivity, and TEP properties. The crystallite size of the samples was determined to be 33–40 nm with increased Er3+ concentration, and the XRD investigations validated the spinel cubic structure of the samples with the space group Fd-3 m. The lattice constant was found to decrease from 8.403 to 8.356 Å. The morphology of FE-SEM micrographs was found to be spherical shape. TEM micrographs show that average particle size decreases from 64 to 48 nm. The nanoparticles’ FTIR examination revealed that their ʋ1 and ʋ2 absorption bands were between 401–412 cm−1 and 547–562 cm−1. The optical band gap was measured using UV–vis spectroscopy and found between 1.81 and 2.38 eV. In Mg–Cu nano-ferrites with Er-doping, there was no noticeable increase in the elasticity moduli. With increasing Er-doping and composition, it has been found that the thermal energy needed to change the p-type Mg–Cu nano-ferrites’ behavior from semiconducting to n-type semiconducting behavior increases. Er-doped Mg–Cu ferrites demonstrate a metal–semiconductor behavior according to DC resistivity exploration.</div>","PeriodicalId":499,"journal":{"name":"Brazilian Journal of Physics","volume":"55 1","pages":""},"PeriodicalIF":1.5,"publicationDate":"2024-11-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142736934","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

Optical Properties of LaF3–LaOF:Yb3+/Tm3+ Upconversion Phosphors: Influence of Annealing Temperature and Time LaF3-LaOF:Yb3+/Tm3+ 上转换荧光粉的光学特性：退火温度和时间的影响

IF 1.5 4区物理与天体物理

Brazilian Journal of Physics Pub Date : 2024-11-27 DOI: 10.1007/s13538-024-01665-x

Toshihiro Nonaka, Yutaro Inoue, Mutsuto Yamamoto, Shin-Ichi Yamamoto

引用次数: 0

Photoluminescence Analysis and Judd–Ofelt Studies in Sr2MgSi2O7:Sm3+ Phosphor Sr2MgSi2O7:Sm3+ 磷酸盐中的光致发光分析和 Judd-Ofelt 研究

IF 1.5 4区物理与天体物理

Brazilian Journal of Physics Pub Date : 2024-11-26 DOI: 10.1007/s13538-024-01661-1

Akshay Pimpalkar, Nilesh Ugemuge, Ashok Mistry, Shruti Dhale, Anil Muke, Rujuta Barve Joshi, Sarika Khapre, Sanjiv Moharil

{"title":"Photoluminescence Analysis and Judd–Ofelt Studies in Sr2MgSi2O7:Sm3+ Phosphor","authors":"Akshay Pimpalkar, Nilesh Ugemuge, Ashok Mistry, Shruti Dhale, Anil Muke, Rujuta Barve Joshi, Sarika Khapre, Sanjiv Moharil","doi":"10.1007/s13538-024-01661-1","DOIUrl":"10.1007/s13538-024-01661-1","url":null,"abstract":"<div>The structural and luminescence properties of akermanite type compound Sr2MgSi2O7:Sm3+ have been investigated. The crystal structure of Sr2MgSi2O7 has been obtained from the X-ray diffraction data. Sr2MgSi2O7 possesses tetragonal symmetry with space group P (overline{4 }) 21 m (No. 113). Judd Ofelt (J-O) analysis of akermanite structured Sm3+-doped Sr2MgSi2O7 phosphor synthesized by combustion synthesis followed by a solid-state reaction process is presented. SEM confirms the morphology. The photoluminescence emission (PL) spectra indicate that the phosphor gives orange red emission at 601 nm attributed to transitions 4G5/2 (to) 6H5/2. Optimum concentration is found to be 7.0 mol.%. The CIE chromaticity coordinates are (0.57, 0.43). The branching ratio for the transition, 4G5/2 (to) 6H7/2, is found to be around 53%, suggesting it as a potential laser material in addition to its use for fabrication of white LED phosphors.</div>","PeriodicalId":499,"journal":{"name":"Brazilian Journal of Physics","volume":"55 1","pages":""},"PeriodicalIF":1.5,"publicationDate":"2024-11-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142714196","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

Novel Approximations to the Third- and Fifth-Order Fractional KdV-Type Equations and Modeling Nonlinear Structures in Plasmas and Fluids 三阶和五阶分数 KdV 型方程的新近似以及等离子体和流体中的非线性结构建模

IF 1.5 4区物理与天体物理

Brazilian Journal of Physics Pub Date : 2024-11-23 DOI: 10.1007/s13538-024-01660-2

Haifa A. Alyousef, Rasool Shah, C. G. L. Tiofack, Alvaro H. Salas, Weaam Alhejaili, Sherif M. E. Ismaeel, S. A. El-Tantawy

{"title":"Novel Approximations to the Third- and Fifth-Order Fractional KdV-Type Equations and Modeling Nonlinear Structures in Plasmas and Fluids","authors":"Haifa A. Alyousef, Rasool Shah, C. G. L. Tiofack, Alvaro H. Salas, Weaam Alhejaili, Sherif M. E. Ismaeel, S. A. El-Tantawy","doi":"10.1007/s13538-024-01660-2","DOIUrl":"10.1007/s13538-024-01660-2","url":null,"abstract":"<div>This investigation examines fractional higher-order evolution and fundamental wave equations, namely the third- and fifth-order fractional Korteweg-de Vries (KdV)-type equations, which regulate diverse nonlinear physical processes, especially those occurring in fluids and plasmas. For this purpose, the Aboodh/Laplace residual power series method (ARPSM) and the Aboodh/Laplace transform iterative method (ATIM) are carried out to derive high-accurate approximations. These methods are applied in conjunction with the Caputo operator, which effectively handles the fractional derivatives. The results illustrate the efficacy of both ARPSM and ATIM in analyzing third- and fifth-order time fractional KdV-type equations, providing valuable insights and potential applications in fractional calculus and its applications to complicated physical and engineering issues. The derived approximations are investigated graphically and numerically to understand the effect of the fractional parameter on the properties of the nonlinear phenomena characterized by this family. Furthermore, the precision and efficacy of the suggested techniques are verified by comparing the derived approximations to the exact solutions for the integer-order cases. The findings of this investigation have the potential to benefit a wide range of researchers who are interested in optical physics, fluid physics, and plasma physics. They can be employed to analyze and comprehend the results of their laboratory and space observations.</div>","PeriodicalId":499,"journal":{"name":"Brazilian Journal of Physics","volume":"55 1","pages":""},"PeriodicalIF":1.5,"publicationDate":"2024-11-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142691949","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

Design and Efficiency Enhancement of Heterojunctions Formed by CZTS and S-Based Buffer Layers for Photovoltaic Applications 用于光伏应用的 CZTS 和 S 基缓冲层形成的异质结的设计和效率提升

IF 1.5 4区物理与天体物理

Brazilian Journal of Physics Pub Date : 2024-11-23 DOI: 10.1007/s13538-024-01647-z

Aka Hyacinthe Aka, Amal Bouich, Sarra Bouazizi, Yassine salhi, Bernabé Mari Soucase, Boko Aka

{"title":"Design and Efficiency Enhancement of Heterojunctions Formed by CZTS and S-Based Buffer Layers for Photovoltaic Applications","authors":"Aka Hyacinthe Aka, Amal Bouich, Sarra Bouazizi, Yassine salhi, Bernabé Mari Soucase, Boko Aka","doi":"10.1007/s13538-024-01647-z","DOIUrl":"10.1007/s13538-024-01647-z","url":null,"abstract":"<div>The quaternary material consisting of copper, zinc, tin and sulfur has long attracted the attention of the scientific world in the development of thin layers for photovoltaic applications. In this work, we proposed to make the junction between the absorbent layer consisting of copper-zinc-tin-sulfur Cu2ZnSnS4 (CZTS) and different buffer layers such as zinc sulfide ZnS, tin disulfide SnS2, and cadmium sulfide CdS for comparison purposes, in using the simple and low-cost technique of spray pyrolysis at 380 °C for all stages. All the films obtained were characterized by X-ray diffraction (XRD), and UV–visible spectroscopy and the morphology and topography of the layers were assessed under the scanning electron microscope (SEM) and EDXA. Characterization results showed the formation of CZTS thin films whose kesterite structure was improved by annealing at 450 °C under sulfur atmosphere. The grain size also improved from 6.7 to 7.9 nm after annealing. Subsequently, a simulation study by SCAPS-1D is made to assess the efficiency of the photovoltaic cell thus produced. It exhibited the highest power conversion efficiency (PCE) for the cell using SnS2 as a buffer layer, i.e., 20.25%, compared to 16.14% for the cell using CdS. This confirmed the possibility of favoring SnS2 in the design of CZTS-based solar cells, suggested in the literature, as a replacement for CdS, and this by the simple technique of spray pyrolysis.</div>","PeriodicalId":499,"journal":{"name":"Brazilian Journal of Physics","volume":"55 1","pages":""},"PeriodicalIF":1.5,"publicationDate":"2024-11-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142691948","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

Discussion on Vector Control Dengue Epidemic Model for Stability Analysis and Numerical Simulations 病媒控制登革热流行病模型稳定性分析和数值模拟讨论

IF 1.5 4区物理与天体物理

Brazilian Journal of Physics Pub Date : 2024-11-23 DOI: 10.1007/s13538-024-01656-y

Ali Raza, Kashif Ali, Syed T. R. Rizvi, Sanaullah Sattar, Aly R. Seadawy

{"title":"Discussion on Vector Control Dengue Epidemic Model for Stability Analysis and Numerical Simulations","authors":"Ali Raza, Kashif Ali, Syed T. R. Rizvi, Sanaullah Sattar, Aly R. Seadawy","doi":"10.1007/s13538-024-01656-y","DOIUrl":"10.1007/s13538-024-01656-y","url":null,"abstract":"<div>Despite advancements in medicine and vaccination, the global death toll from dengue disease continues to rise, especially in developing countries, where modern healthcare access and prevention are limited. In the twenty-first century, dengue disease has emerged as a severe global challenge for the health sector because it severely affects more than 100 countries and causes thousands of deaths annually. This study designs an SEIR-SEI mathematical model of the dengue virus by introducing a control parameter within the mosquito population. The inclusion of this parameter enables us to determine the impact of control measures on the transmission dynamics of the dengue virus. Firstly, we ensure that all state variables are bounded and remain non-negative throughout the study. Then, we calculate the two equilibrium points, the dengue-free equilibrium (DFE) and dengue-endemic equilibrium point (DEE), of the model for further analysis. We also calculate the reproductive number (mathfrak {R}), which is a crucial threshold parameter in epidemiology. The qualitative analysis shows that the model possesses local and global stability at the DFE and DEE points if (mathfrak {R}<1) and (mathfrak {R}>1), respectively. We also conduct a sensitivity analysis to identify the parameter with the most significant impact on the transmission dynamics of the dengue virus. This insight assists health policy makers in optimizing their struggles to lower the infection rates between susceptible humans and infected mosquito populations. We apply the two numerical schemes, the non-standard finite difference scheme (NSFD) and the Runga-kutta (RK4) scheme, to validate the theoretical and numerical results of the proposed SEIR-SEI dengue epidemic model. Numerical simulations are also provided in support of these results.</div>","PeriodicalId":499,"journal":{"name":"Brazilian Journal of Physics","volume":"55 1","pages":""},"PeriodicalIF":1.5,"publicationDate":"2024-11-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142691950","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

Correction: An Exploration of Anisotropic Acoustic Wave Attenuation in Quartz Crystals 更正：石英晶体中各向异性声波衰减的探索

IF 1.5 4区物理与天体物理

Brazilian Journal of Physics Pub Date : 2024-11-16 DOI: 10.1007/s13538-024-01657-x

Temur Mustafayev, Farkhad Akhmedzhanov, Jurabek Abdiev, Shakhboz Khasanov

引用次数: 0