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Brazilian Journal of Physics最新文献

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Ion-Acoustic Dressed Solitons in Plasmas Having Positrons and Superthermal Electrons 具有正电子和超热电子的等离子体中的离子声压孤子
IF 1.5 4区 物理与天体物理
Brazilian Journal of Physics Pub Date : 2024-09-30 DOI: 10.1007/s13538-024-01605-9
M. K. Rawat, J. K. Chawla, V. Mandot
{"title":"Ion-Acoustic Dressed Solitons in Plasmas Having Positrons and Superthermal Electrons","authors":"M. K. Rawat,&nbsp;J. K. Chawla,&nbsp;V. Mandot","doi":"10.1007/s13538-024-01605-9","DOIUrl":"10.1007/s13538-024-01605-9","url":null,"abstract":"<div><p>Using the reductive perturbation method (RPM) drive the Korteweg-de Vries (KdV) equation for ion-acoustic dressed solitons (IADSs) in unmagnetized plasmas consisting of superthermal electrons, positrons, and ions. We have studied the characteristics of the KdV and dressed solitons (KDSs) for different values of superthermal electrons, positrons, ionic temperature ratio (<i>γ</i>), and fractional concentration (<i>α</i>). For a given fixed superthermal parameter, soliton amplitude increases as soliton velocity increases of the KDSs, respectively. The difference in velocity of the KDSs decreases as the superthermal parameter increases at any given soliton amplitude. At any given soliton velocity, the difference between amplitude of the KDSs decreases as the superthermal parameter increases. This system is satisfied for superthermal parameters that are present in astrophysical plasma environments (viz. Saturn magnetosphere, pulsar magnetosphere).</p></div>","PeriodicalId":499,"journal":{"name":"Brazilian Journal of Physics","volume":"54 6","pages":""},"PeriodicalIF":1.5,"publicationDate":"2024-09-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142415114","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
Magnon Transfer in Heisenberg Chains with Trimer-Correlated Disorder Under the Influence of a Disordered Magnetic Field 无序磁场影响下具有三聚相关无序的海森堡链中的磁子传输
IF 1.5 4区 物理与天体物理
Brazilian Journal of Physics Pub Date : 2024-09-28 DOI: 10.1007/s13538-024-01613-9
V. A. Teixeira, F. Moraes, A. L. R. Barbosa, G. M. A. Almeida, F. A. B. F. de Moura
{"title":"Magnon Transfer in Heisenberg Chains with Trimer-Correlated Disorder Under the Influence of a Disordered Magnetic Field","authors":"V. A. Teixeira,&nbsp;F. Moraes,&nbsp;A. L. R. Barbosa,&nbsp;G. M. A. Almeida,&nbsp;F. A. B. F. de Moura","doi":"10.1007/s13538-024-01613-9","DOIUrl":"10.1007/s13538-024-01613-9","url":null,"abstract":"<div><p>We examined a one-dimensional quantum Heisenberg model that includes trimer-like correlated disordered exchange couplings and a non-uniform magnetic field. We conducted numerical experiments to study the transfer of magnons between the two ends of the chain. Using numerical methods, we calculated the time evolution of a localized magnon state at the left end of the chain. We evaluated the quality of the transfer from the left end to the right using standard tools such as fidelity and concurrence. Our calculations demonstrate the existence of magnon transfer with good fidelity for some specific energies (<span>(E&gt;0)</span>) in the absence of a magnetic field. We also investigated the impact of the random magnetic field on our findings.</p></div>","PeriodicalId":499,"journal":{"name":"Brazilian Journal of Physics","volume":"54 6","pages":""},"PeriodicalIF":1.5,"publicationDate":"2024-09-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142414818","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
Magnetic Properties in the Spin-3/2 Ashkin-Teller Model from Mean Field Theory 从平均场理论看自旋-3/2 阿什金-泰勒模型的磁特性
IF 1.5 4区 物理与天体物理
Brazilian Journal of Physics Pub Date : 2024-09-27 DOI: 10.1007/s13538-024-01617-5
J. P. Santos, G. B. B. Nascimento, R. H. M. Morais, J. G. Silva
{"title":"Magnetic Properties in the Spin-3/2 Ashkin-Teller Model from Mean Field Theory","authors":"J. P. Santos,&nbsp;G. B. B. Nascimento,&nbsp;R. H. M. Morais,&nbsp;J. G. Silva","doi":"10.1007/s13538-024-01617-5","DOIUrl":"10.1007/s13538-024-01617-5","url":null,"abstract":"<div><p>In the present work, we investigate the spin-3/2 Ashkin-Teller model with on a cubic lattice with ferromagnetic coupling, utilizing mean field theory developed through a variational principle based on the Bogoliubov inequality to derive thermodynamic expressions, such as free energy and magnetization. We develop analytical equations and obtain numerical results, phase diagrams, and magnetizations, exploring different phases with continuous and first-order phase transitions, tricritical and bifurcation points. The different phases are obtained by considering a relationship between the couplings present in the model and the spin-3/2 anisotropy. Thermodynamic properties are characterized through the analysis of Hessian matrices, with an emphasis on the stable states of magnetizations. The results were compared with other works showing convergence and assimilating new characteristics in the study of the properties of this model, such as the presence of five distinct phases characterized by continuous and first-order phase transitions, tricritical and bifurcations points, in addition to the presence of new phases indicating the sensitivity of the system to variations in the exchange interaction values between the spin variables and the evolution of some phase transitions influenced by the spin-3/2 anisotropy.</p></div>","PeriodicalId":499,"journal":{"name":"Brazilian Journal of Physics","volume":"54 6","pages":""},"PeriodicalIF":1.5,"publicationDate":"2024-09-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142414599","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
Green Synthesis and Photocatalytic and Antibacterial Performance of Cerium and Silver Dual Doped ZnO Nanoparticles 铈银双掺氧化锌纳米粒子的绿色合成及其光催化和抗菌性能
IF 1.5 4区 物理与天体物理
Brazilian Journal of Physics Pub Date : 2024-09-27 DOI: 10.1007/s13538-024-01601-z
Fuád Ameén, Hosséin Khonakbaar, Pézhman Narany
{"title":"Green Synthesis and Photocatalytic and Antibacterial Performance of Cerium and Silver Dual Doped ZnO Nanoparticles","authors":"Fuád Ameén,&nbsp;Hosséin Khonakbaar,&nbsp;Pézhman Narany","doi":"10.1007/s13538-024-01601-z","DOIUrl":"10.1007/s13538-024-01601-z","url":null,"abstract":"<div><p>This investigation aimed to finalize the synthesis of zinc oxide nanoparticles doped with cerium and silver (Ce/Ag-ZnO NP) using <i>gelatin</i>. The synthesized nanoparticles were analyzed using powder X-ray diffraction (PXRD) and field emission scanning electron microscopy (FESEM) to examine their spherical structure and smooth surfaces. The photocatalytic efficiency of the synthesized samples was evaluated by studying their performance in degrading methylene blue (MB) under ultraviolet light. The results demonstrated that dual doped nanoparticles were effective in depredating 94% of methylene blue dye at pH = 7. Additionally, when tested against <i>Streptococcus mutans</i>, the antibacterial evaluation indicated the greater efficacy of dual doped nanoparticles compared to pure ones. As a reasoned suggestion, the Ce/Ag-ZnO NP was found to be a suitable option for dental applications based on the gathered antibacterial results, which facilitated the comparison between doped and pure nanoparticles.</p></div>","PeriodicalId":499,"journal":{"name":"Brazilian Journal of Physics","volume":"54 6","pages":""},"PeriodicalIF":1.5,"publicationDate":"2024-09-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142414568","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
Analysis of Ultra-Central Relativistic Heavy Ions Collisions Based on Energy Parameterization 基于能量参数化的超中心相对论重离子碰撞分析
IF 1.5 4区 物理与天体物理
Brazilian Journal of Physics Pub Date : 2024-09-23 DOI: 10.1007/s13538-024-01612-w
Liner Santos
{"title":"Analysis of Ultra-Central Relativistic Heavy Ions Collisions Based on Energy Parameterization","authors":"Liner Santos","doi":"10.1007/s13538-024-01612-w","DOIUrl":"10.1007/s13538-024-01612-w","url":null,"abstract":"<div><p>Hydrodynamic models of heavy-ion collisions have been very successful at describing experimental data. A peculiar exception is anisotropic flow in ultra-central collisions. No existing model for the initial stages of a heavy-ion collision, when used as initial conditions for hydrodynamics simulations, can provide a satisfactory description of flow in ultra-central collisions. It is therefore useful to understand what properties the initial stages must have in order to be compatible with experimental data. To this end, we parameterize the early-time energy density and its fluctuations via its 1-point and 2-point function and constrain them by using experimental data for vn2 in conjunction with hydrodynamic simulations. We find that it is possible to describe experimental data, but it requires larger fluctuations in regions of low density, as compared to existing Monte Carlo models. We comment on the implications of this finding, as well as the limitations of this initial analysis and how it can be improved in the future.</p></div>","PeriodicalId":499,"journal":{"name":"Brazilian Journal of Physics","volume":"54 6","pages":""},"PeriodicalIF":1.5,"publicationDate":"2024-09-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142413312","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
Effects of Ionic Conductances on Spiral-Wave Dynamics in a Ventricular Tissue Model 离子电导对心室组织模型螺旋波动力学的影响
IF 1.5 4区 物理与天体物理
Brazilian Journal of Physics Pub Date : 2024-09-18 DOI: 10.1007/s13538-024-01607-7
Duryodhan Prusty, Alok Ranjan Nayak
{"title":"Effects of Ionic Conductances on Spiral-Wave Dynamics in a Ventricular Tissue Model","authors":"Duryodhan Prusty,&nbsp;Alok Ranjan Nayak","doi":"10.1007/s13538-024-01607-7","DOIUrl":"10.1007/s13538-024-01607-7","url":null,"abstract":"<div><p>Irregular electrical activities in cardiac tissue, manifested as spiral waves, often lead to fibrillation—a major cause of heart failure. Such irregularities may arise due to the abnormal action potentials of cardiac cells during various disease conditions. In this study, we show, using a ventricular model, the impact of conductances of ionic currents on the action potentials of a single cardiac cell and the formation of spiral waves in cardiac tissue. When conductances, <span>(varvec{G}_{varvec{ca}})</span> and <span>(varvec{G}_{varvec{k}})</span>, are altered from their model values, we observe four distinct types of action potential (AP) states: normal-type AP, early afterdepolarization (EAD)-type AP, repolarization oscillation (RO)-type AP, and repolarization failure (RF)-type AP. Our systematic numerical studies on cardiac tissue reveal four different spiral states, namely, (a) a periodic spiral (PS) state, (b) a quasi-periodic spiral (QPS) state, (c) an absorbed spiral (AS) state, and (d) a no-spiral (NS) state. The superimposed phase diagrams of AP and spiral states on the <span>(varvec{G}_{varvec{ca}}-varvec{G}_{varvec{k}})</span> parameter space highlight the role of AP states in spiral wave dynamics.</p></div>","PeriodicalId":499,"journal":{"name":"Brazilian Journal of Physics","volume":"54 6","pages":""},"PeriodicalIF":1.5,"publicationDate":"2024-09-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142265757","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
A Comparative Study of the individual and Mixed Oxide Nanostructures on Sunlight Driven Degradation of Methylene Blue Dye and Antimicrobial Efficacy 单个和混合氧化物纳米结构对日光驱动的亚甲基蓝染料降解和抗菌功效的比较研究
IF 1.5 4区 物理与天体物理
Brazilian Journal of Physics Pub Date : 2024-09-18 DOI: 10.1007/s13538-024-01610-y
Sona G. Krishnan, Deepak Nand
{"title":"A Comparative Study of the individual and Mixed Oxide Nanostructures on Sunlight Driven Degradation of Methylene Blue Dye and Antimicrobial Efficacy","authors":"Sona G. Krishnan,&nbsp;Deepak Nand","doi":"10.1007/s13538-024-01610-y","DOIUrl":"10.1007/s13538-024-01610-y","url":null,"abstract":"<div><p>In this study, we synthesized CuO-NiO mixed transition metal oxide nanoparticles by a low-cost co-precipitation approach with deoxyribonucleic acid (DNA) as a capping agent. The synthesized nanoparticles were thoroughly characterized using a range of instrumental methods, such as energy-dispersive X-ray spectroscopy (EDX), Fourier transform-infrared spectroscopy (FT-IR), UV-vis spectroscopy, and X-ray diffraction (XRD). CuO and NiO’s ensuing bimetallic compositions revealed that NiO has a cubic phase and CuO has a monoclinic structure. When exposed to sunlight for varying durations, spanning from 0 to 180 min, these nanoparticles showed photoactivity and established their effectiveness as catalysts for the breakdown of Methylene Blue (MB). For NiO, CuO, and CuO-NiO, the corresponding degradation efficiencies were found to be 62%, 74%, and 89%. The MB degrading efficiency of CuO-NiO was significantly higher than that of individual CuO and NiO, with a kinetic rate constant of 1.175 min<sup>-1</sup>. CuO-NiO nanoparticles demonstrated significant potential as a photocatalyst for water pollution elimination. CuO-NiO outperformed CuO and NiO nanoparticles in terms of anti-fungal activity against <i>Aspergillus Niger</i> and <i>Candida albicans</i>, according to an assessment conducted using the Potato Dextrose agar well diffusion technique.</p></div>","PeriodicalId":499,"journal":{"name":"Brazilian Journal of Physics","volume":"54 6","pages":""},"PeriodicalIF":1.5,"publicationDate":"2024-09-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142265755","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
Barcelos-Wotzasek Symplectic Algorithm for Constrained Systems Revisited 再论约束系统的巴塞洛斯-沃扎塞克交点算法
IF 1.5 4区 物理与天体物理
Brazilian Journal of Physics Pub Date : 2024-09-17 DOI: 10.1007/s13538-024-01603-x
M. A. De Andrade, C. Neves, E. V. Corrêa Silva
{"title":"Barcelos-Wotzasek Symplectic Algorithm for Constrained Systems Revisited","authors":"M. A. De Andrade,&nbsp;C. Neves,&nbsp;E. V. Corrêa Silva","doi":"10.1007/s13538-024-01603-x","DOIUrl":"10.1007/s13538-024-01603-x","url":null,"abstract":"<div><p>A minor change in the Barcelos-Wotzasek (BW) symplectic algorithm for constrained systems is proposed. The change addresses some criticism that formalism has received, placing it on the same footing as Dirac’s algorithm.</p></div>","PeriodicalId":499,"journal":{"name":"Brazilian Journal of Physics","volume":"54 6","pages":""},"PeriodicalIF":1.5,"publicationDate":"2024-09-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142265756","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
From EPR Wave Function to Bi-Particle Entangled State Representation 从 EPR 波函数到双粒子纠缠态表示法
IF 1.5 4区 物理与天体物理
Brazilian Journal of Physics Pub Date : 2024-09-17 DOI: 10.1007/s13538-024-01592-x
Rui He, Ze Wu, Hongyi Fan
{"title":"From EPR Wave Function to Bi-Particle Entangled State Representation","authors":"Rui He,&nbsp;Ze Wu,&nbsp;Hongyi Fan","doi":"10.1007/s13538-024-01592-x","DOIUrl":"10.1007/s13538-024-01592-x","url":null,"abstract":"<div><p>We directly develop the wave function of EPR (Einstein et al., Phys. Rev. <b>47</b>, 777 1935) into a state vector with the use of the method of integration within ordered product (IWOP) of operators. We find that this kind of states is normalized as an orthogonal complete set which is capable of constituting an entangled state representation; its Schmidt decomposition is derived, and its application for explaining two-mode squeezing is presented. Furthermore, with the aid of the bosonic mode conversions in two different coordinate frames, we show that the 2d coordinate or momentum eigenstate can appear as the form of the entangled state.</p></div>","PeriodicalId":499,"journal":{"name":"Brazilian Journal of Physics","volume":"54 6","pages":""},"PeriodicalIF":1.5,"publicationDate":"2024-09-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142265758","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
Electrochromic Properties of RF-Sputtered WO3 Films: An Impact of Post-annealing and Room Temperatures for Smart Window Applications 射频烧结 WO3 薄膜的电致变色特性：用于智能窗应用的后退火和室温的影响
IF 1.5 4区 物理与天体物理
Brazilian Journal of Physics Pub Date : 2024-09-16 DOI: 10.1007/s13538-024-01606-8
Ashok Reddy G V, Kilari Naveen Kumar, Sheik Abdul Sattar, C Devaraja, Dhanalakshmi Radhalayam, Doreswamy B H, Ramachandra Naik, K Munirathnam, Nunna Guru Prakash, Mushtaq Ahmad Ansari, Tae Jo Ko
{"title":"Electrochromic Properties of RF-Sputtered WO3 Films: An Impact of Post-annealing and Room Temperatures for Smart Window Applications","authors":"Ashok Reddy G V,&nbsp;Kilari Naveen Kumar,&nbsp;Sheik Abdul Sattar,&nbsp;C Devaraja,&nbsp;Dhanalakshmi Radhalayam,&nbsp;Doreswamy B H,&nbsp;Ramachandra Naik,&nbsp;K Munirathnam,&nbsp;Nunna Guru Prakash,&nbsp;Mushtaq Ahmad Ansari,&nbsp;Tae Jo Ko","doi":"10.1007/s13538-024-01606-8","DOIUrl":"10.1007/s13538-024-01606-8","url":null,"abstract":"<div><p>Tungsten oxide (WO<sub>3</sub>) thin films were deposited on glass substrates of Corning glass (CG) and fluorine-doped tin oxide (FTO) using an RF magnetron sputtering process. The effects of varying the annealing temperature on structural, surface morphology, optical properties, and electrochromic (EC) are examined using X-ray diffraction, Fourier-transform infrared spectroscopy (FTIR), SEM, Raman spectroscopy, UV-Vis spectroscopy, and cyclic voltammetry. WO<sub>3</sub> thin films annealed at 573 K and 673 K were shown by SEM analysis to have fewer cracks after being found to crack more at 773 K. According to the XRD investigation, the WO<sub>3</sub> thin films annealed at 573 K, 673 K, and 773 K had a crystalline nature. At 773 K, when the coloring efficiency (CE) was determined to be 40.45 cm<sup>2</sup>/s, the diffusion coefficient was found to be the lowest (1.7 × 10<sup>−14</sup> cm<sup>2</sup>/C). At 573 K, the coloring efficiency (CE) was measured to be 52.38 cm<sup>2</sup>/C, and at 673 K, it was 39.33 cm<sup>2</sup>/C. It has been discovered that post-annealing significantly affects color efficiency, which is important in electrochromic (EC) applications.</p></div>","PeriodicalId":499,"journal":{"name":"Brazilian Journal of Physics","volume":"54 6","pages":""},"PeriodicalIF":1.5,"publicationDate":"2024-09-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142265917","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
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