Brazilian Journal of Physics最新文献

Surface State Electronic Characteristics and (mathbb {Z}_2) Topological Invariant of (Bi_2Te_3) Topological Insulator Through PBE and LmBJ Potential 基于PBE和LmBJ电位的(Bi_2Te_3)拓扑绝缘子表面态电子特性和(mathbb {Z}_2)拓扑不变性

IF 1.7 4区物理与天体物理

Brazilian Journal of Physics Pub Date : 2025-10-06 DOI: 10.1007/s13538-025-01910-x

Burhan Ahmed, B. Indrajit Sharma

引用次数: 0

Correction: A First-Principles Study of the Structural, Optoelectronic and Thermoelectric Properties of Ba2XIO6 (X = Li, K and Rb) for Energy Harvesting 修正：能量收集用Ba2XIO6 （X = Li， K和Rb）的结构、光电和热电性质的第一性原理研究

IF 1.7 4区物理与天体物理

Brazilian Journal of Physics Pub Date : 2025-10-03 DOI: 10.1007/s13538-025-01913-8

M. Awais Ahmed, Shoaib Ullah, Khalil Ur Rehman, G. Murtaza, Ahmad Ayyaz, M. Irfan, Imen Kebaili, Ali El-Rayyes

引用次数: 0

Experimental Studies on the Random Lasing of Dye Doped in XFJ151-Magnetic Mesoporous Silica Nanoparticles xfj151 -磁性介孔二氧化硅纳米颗粒掺杂染料的随机激光实验研究

IF 1.7 4区物理与天体物理

Brazilian Journal of Physics Pub Date : 2025-10-02 DOI: 10.1007/s13538-025-01890-y

Longwu Li, Zhen-Zhen Shang, Xiaofei Dong, Xinmeng Yu

引用次数: 0

High-Isolation Multilayered SIW-Based MIMO Antenna for Next-Generation Terahertz Applications 用于下一代太赫兹应用的高隔离多层siw MIMO天线

IF 1.7 4区物理与天体物理

Brazilian Journal of Physics Pub Date : 2025-10-01 DOI: 10.1007/s13538-025-01911-w

Ruchi Agarwal, Ranjana Kumari, Sachin Kumar

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Multifunctional Urea L-Malic Acid Crystals: Structural, Optical, Thermal, and Dielectric Insights for Optoelectronic Uses 多功能尿素l -苹果酸晶体：光电用途的结构、光学、热学和介电性见解

IF 1.7 4区物理与天体物理

Brazilian Journal of Physics Pub Date : 2025-10-01 DOI: 10.1007/s13538-025-01909-4

Helen Merina Albert, D. Neelima Patnaik, N. Padmamalini, V. Nagalakshmi, G. Chinna Ram, Nellore Manoj Kumar, M. P. Mallesh

{"title":"Multifunctional Urea L-Malic Acid Crystals: Structural, Optical, Thermal, and Dielectric Insights for Optoelectronic Uses","authors":"Helen Merina Albert, D. Neelima Patnaik, N. Padmamalini, V. Nagalakshmi, G. Chinna Ram, Nellore Manoj Kumar, M. P. Mallesh","doi":"10.1007/s13538-025-01909-4","DOIUrl":"10.1007/s13538-025-01909-4","url":null,"abstract":"<div>Synthesis of the Urea l-malic acid (ULM) crystal was accomplished through a gradual evaporation growth technique. The characterization encompassed a thorough examination of its structural, spectral, optical, thermal, and dielectric aspects. The single-crystal X-ray diffraction (SCXRD) study elucidated a monoclinic pattern characterized by a non-centrosymmetric P21 space group. Fourier transform infrared (FTIR) study validated the existence of functional groups essential for hydrogen bonding and crystal sustainability. Optical investigations demonstrated significant UV absorbance at 261 nm, accompanied by a broad optical bandgap (4.185 eV). The Urbach energy was approximated at 0.228 eV, suggesting a high degree of crystallinity. A notable photoluminescence (PL) emission was detected at 460 nm, exhibiting a high degree of color purity at 77.15%, thereby endorsing its potential utility in blue-light display systems. Measurements of second-harmonic generation (SHG) showed that it was 2.2 times more effective than regular KDP, thereby underscoring its potential for nonlinear optical applications. The thermal stability was verified at temperatures reaching 120 °C, accompanied by a calculated activation energy (9.50 kJ/mol). Dielectric investigations revealed behavior that is dependent on both frequency and temperature, with AC conductivity exhibiting an increase in response to rising temperature. Impedance analysis demonstrated a non-Debye relaxation mechanism and a single semicircular Nyquist graph. The findings validate the multifunctional capabilities of ULM crystals for prospective applications in optoelectronic, photonic, and electrochemical systems.</div>","PeriodicalId":499,"journal":{"name":"Brazilian Journal of Physics","volume":"55 6","pages":""},"PeriodicalIF":1.7,"publicationDate":"2025-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145210502","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 Heat and Mass Transfer in MHD Forced Convection with Chemical Parameter Effects on a Horizontal Porous Plate 考虑化学参数影响的水平多孔板MHD强制对流传热传质分析

IF 1.7 4区物理与天体物理

Brazilian Journal of Physics Pub Date : 2025-09-27 DOI: 10.1007/s13538-025-01907-6

Toha François Lihonou, Mamadi Diakite, Abdelghani Laouer, Hilaire Segning, Kalil Pierre Mathos, Nakany Camara

{"title":"Analysis of Heat and Mass Transfer in MHD Forced Convection with Chemical Parameter Effects on a Horizontal Porous Plate","authors":"Toha François Lihonou, Mamadi Diakite, Abdelghani Laouer, Hilaire Segning, Kalil Pierre Mathos, Nakany Camara","doi":"10.1007/s13538-025-01907-6","DOIUrl":"10.1007/s13538-025-01907-6","url":null,"abstract":"<div>The coupling of thermal, concentration, and electromagnetic fields arises in various industrial and environmental processes. The presence of a magnetic field alters flow dynamics and energy transport through the Lorentz force, while chemical reactions affect the concentration boundary layer and influence mass transfer. This study focuses on the numerical investigation of fluid flow, heat transfer, and forced magnetohydrodynamic (MHD) convection through a semi-infinite horizontal porous plate, taking into account the effects of chemical parameters. By analyzing the boundary layer, a reduced model was developed to represent the time-independent governing equations for momentum, energy, and concentration. These equations were expressed in a dimensionless, nonlinear form and subsequently transformed into a system of nonlinear ordinary differential equations (ODEs). The resulting ODE system was solved using the BVP4C method implemented in the MATLAB R2024b environment. Numerical simulations were conducted to examine the influence of various parameters—including the magnetic parameter, porous medium permeability, Eckert number, Schmidt number, Prandtl number, Dufour number, blowing/suction velocity, and Soret number—on the velocity, temperature, and concentration profiles, as well as on the skin friction coefficient, Nusselt number, and Sherwood number. The study reveals that an increase in the magnetic parameter leads to higher velocity, temperature, and concentration profiles. Blowing (positive velocity) enhances both temperature and concentration distributions and increases the Sherwood number; however, it reduces the velocity profile, skin friction coefficient, and Nusselt number. In contrast, suction (negative velocity) exhibits the opposite effects on these parameters.</div>","PeriodicalId":499,"journal":{"name":"Brazilian Journal of Physics","volume":"55 6","pages":""},"PeriodicalIF":1.7,"publicationDate":"2025-09-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145210290","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

Intermittency Analysis of Charged Particles ((pi ^{pm }), (K^{pm })) Generated in (p-Pb) Collisions at LHC Energies Using AMPT Model 利用AMPT模型对LHC能量(p-Pb)对撞产生的带电粒子（(pi ^{pm }), (K^{pm })）的间歇性分析

IF 1.7 4区物理与天体物理

Brazilian Journal of Physics Pub Date : 2025-09-26 DOI: 10.1007/s13538-025-01897-5

Dibakar Dhar, Shreya Bhattacharjee, Tumpa Biswas, Rini Bhattacharyya, Dipak Ghosh, Prabir Kumar Haldar

{"title":"Intermittency Analysis of Charged Particles ((pi ^{pm }), (K^{pm })) Generated in (p-Pb) Collisions at LHC Energies Using AMPT Model","authors":"Dibakar Dhar, Shreya Bhattacharjee, Tumpa Biswas, Rini Bhattacharyya, Dipak Ghosh, Prabir Kumar Haldar","doi":"10.1007/s13538-025-01897-5","DOIUrl":"10.1007/s13538-025-01897-5","url":null,"abstract":"<div>This study provides a thorough analysis of the multiplicities of charged particles ((pi ^{pm }, varvec{K}^{pm })) produced in (p-varvec{P}b) collisions at (sqrt{s_textrm{NN}}) = 5.02 and 8.16 TeV. We utilize the scaled factorial moment (SFM) method to analyze events generated by the AMPT model, specifically examining cases with (pi ^0) and (varvec{K}_s^0) decays both turned off as AMPT (Decay = Off) and both these decays turned on as AMPT (Decay = On). We derive the anomalous fractal dimension ((d_q)) from the intermittency exponent ((alpha _q)) and analyze its variations with changing order (q). Several measures, including the anomalous fractal dimension, degree of multifractality (r), critical exponent ((nu )), Lévy index ((mu )), and multifractal specific heat (c), show the observed intermittent variations. Additionally, we investigate the quark-hadron phase transition through a second-order phase transition, adopting a scaled factorial moment approach with Ginzburg-Landau theory. This study includes a comparison of critical exponent ((nu )) values derived from AMPT-simulated datasets and data from Au+Au collisions at energies ranging from (sqrt{s_textrm{NN}} = mathbf {7.7}) to 200 GeV. Also, we have presented a comparison of the generalized fractal dimension ((varvec{D}_q)) and specific heat (c) across various emulsion interactions with the AMPT-simulated datasets.</div>","PeriodicalId":499,"journal":{"name":"Brazilian Journal of Physics","volume":"55 6","pages":""},"PeriodicalIF":1.7,"publicationDate":"2025-09-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145145225","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

Influence of Copper Incorporation on the Structural, Optical, and Antibacterial Properties of ZnO Nanosystems 铜掺入对ZnO纳米体系结构、光学和抗菌性能的影响

IF 1.7 4区物理与天体物理

Brazilian Journal of Physics Pub Date : 2025-09-25 DOI: 10.1007/s13538-025-01908-5

J. Mangaiyarkkarasi, S. Sasikumar

{"title":"Influence of Copper Incorporation on the Structural, Optical, and Antibacterial Properties of ZnO Nanosystems","authors":"J. Mangaiyarkkarasi, S. Sasikumar","doi":"10.1007/s13538-025-01908-5","DOIUrl":"10.1007/s13538-025-01908-5","url":null,"abstract":"<div>Zn(1-x)CuxO (x = 0.00, 0.01, 0.03, and 0.05) nanostructures have been synthesized by a simple chemical co-precipitation method, and the prepared samples have been analyzed by Powder X-ray diffraction (PXRD), UV–visible spectrophotometry (UV–Vis), Photoluminescence (PL), Fourier Transform Infrared spectroscopy (FTIR), and antibacterial activity. The Bragg peaks of XRD data matched well with the standard JCPDS data (PDF #89-1397). X-ray investigation reveals that all the synthesized samples are crystallized in a hexagonal wurzite structure with space group P63mc and space group number 186. The average crystallite size is calculated using Scherrer’s formula and falls in the range of 28 nm to 37 nm. Lattice parameters are calculated using relevant formulae and are in good agreement with the standard values. From UV–Vis absorption spectra, optical band gap values are increased from 3.574 eV to 3.569 eV which confirms the wide band gap of ZnO useful for sensor applications. PL emission spectra show the emission peaks around 380 nm which confirms that undoped and copper-doped ZnO samples are optically active in the ultraviolet region. The presence of key functional groups throughout the steps of this synthesis is explained based on the results obtained from FTIR analysis. Antibacterial activity for ZnO and Cu-ZnO nanoparticles was also analyzed using the well diffusion method.</div>","PeriodicalId":499,"journal":{"name":"Brazilian Journal of Physics","volume":"55 6","pages":""},"PeriodicalIF":1.7,"publicationDate":"2025-09-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145145135","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

Future Research Direction on Rare-Earth and Alkaline-Earth Metal-Doped LaMnO3 Perovskites 稀土和碱土金属掺杂LaMnO3钙钛矿的未来研究方向

IF 1.7 4区物理与天体物理

Brazilian Journal of Physics Pub Date : 2025-09-24 DOI: 10.1007/s13538-025-01898-4

Om Prakash Hota, Pragyan Mohanty, Ranjita Mahapatra

{"title":"Future Research Direction on Rare-Earth and Alkaline-Earth Metal-Doped LaMnO3 Perovskites","authors":"Om Prakash Hota, Pragyan Mohanty, Ranjita Mahapatra","doi":"10.1007/s13538-025-01898-4","DOIUrl":"10.1007/s13538-025-01898-4","url":null,"abstract":"<div>Lanthanum manganite (LaMnO3) and its doped derivatives have become an important class of perovskite materials due to their adaptable structural, electronic, and magnetic properties. A-site substitution with rare-earth elements and alkaline-earth elements has been shown to manipulate the Mn3+/Mn4+ ratio, alter oxygen vacancy concentrations, and perturb lattice distortions; all of this can impact conductivity, catalytic activity, and magnetism. These properties render a wide variety of applications appealing for doped LaMnO3 materials, including solid oxide fuel cells, catalysis, spintronics, and energy storage. Even so, several challenges have limited their broader use, such as secondary-phase formation, electrolyte reactivity, dopant segregation, and processing at high temperatures. This article discusses advancements toward addressing these challenges with synthesis, defect engineering, and computational methods. Additionally, it reflects on the potential of new tools (machine learning and nanoscale design) to speed up the discovery of optimized compositions and processing conditions. Despite present problems, doped LaMnO3 perovskites remain a promising material for energy and electrical applications.\u0000</div>","PeriodicalId":499,"journal":{"name":"Brazilian Journal of Physics","volume":"55 6","pages":""},"PeriodicalIF":1.7,"publicationDate":"2025-09-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145145113","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

Investigation of Relaxation Processes over Static Permittivity-Frequency Regime and the Observance of Stokes–Einstein-Debye Relation in the Plastic Crystalline Phase of Neopentylglycol 新戊二醇塑性结晶相中静态介电常数-频率弛豫过程及Stokes-Einstein-Debye关系的研究

IF 1.7 4区物理与天体物理

Brazilian Journal of Physics Pub Date : 2025-09-20 DOI: 10.1007/s13538-025-01899-3

Lokendra P. Singh, Rutuja Petkar, Datta V. Sarwade

{"title":"Investigation of Relaxation Processes over Static Permittivity-Frequency Regime and the Observance of Stokes–Einstein-Debye Relation in the Plastic Crystalline Phase of Neopentylglycol","authors":"Lokendra P. Singh, Rutuja Petkar, Datta V. Sarwade","doi":"10.1007/s13538-025-01899-3","DOIUrl":"10.1007/s13538-025-01899-3","url":null,"abstract":"<div>Impedance spectroscopy has been used to investigate the relaxation processes over the static permittivity (εs) frequency regime in the plastic crystalline phase (PC) of neopentylglycol (NPG) at the temperature range (313.3–353.6 K) and frequency from 20 Hz to 1 MHz. The data have been critically analyzed in the form of complex dielectric function (ε*), ac conductance (σ*), electric modulus (M*), and impedance (Z*) of NPG spectra. The presence of the phenomena of electrode polarization and ionic conduction was explored based on a comparative analysis of the spectra of all the complex quantities. The T-dependence of various physical quantities such as static permittivity (εs), Kirkwood correlation factor (gk), dc conductivity (σdc), time constant due to ionic conductivity relaxation (τσ), electrode polarization (τep), and the activation energies have been determined using well-known Arrhenius law. It was found that on a log–log scale, the dependence of dc conductivity (σdc) on the structural relaxation time (τα) of pure NPG shows a linear behavior with a negative slope of unity; hence, it fulfills the Stokes–Einstein–Debye relation quite well. This suggests that temperature has no effect on the size of the molecular environment in which ions’ movement takes place.</div>","PeriodicalId":499,"journal":{"name":"Brazilian Journal of Physics","volume":"55 6","pages":""},"PeriodicalIF":1.7,"publicationDate":"2025-09-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145090420","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