Brazilian Journal of Physics最新文献_第9页

Effect of Regularized (kappa ) Distribution and Polarization Force on the Dust Acoustic Waves in the Mesosphere Region 正则化（kappa）分布和极化力对中间层区域尘埃声波的影响

IF 1.5 4区物理与天体物理

Brazilian Journal of Physics Pub Date : 2024-11-16 DOI: 10.1007/s13538-024-01648-y

Zhong-Zheng Li, Li-Qiang Jie, Sheng-De Liang, Kai Jiang, Dong-Ning Gao

{"title":"Effect of Regularized (kappa ) Distribution and Polarization Force on the Dust Acoustic Waves in the Mesosphere Region","authors":"Zhong-Zheng Li, Li-Qiang Jie, Sheng-De Liang, Kai Jiang, Dong-Ning Gao","doi":"10.1007/s13538-024-01648-y","DOIUrl":"10.1007/s13538-024-01648-y","url":null,"abstract":"<div><p>Dust acoustic waves (DAWs) in a magnetized plasma with positive dust grains are carried out as affected by superthermal spectral index, cutoff parameter, plasma temperature, and density. The fluid equations considering polarization force (PF) are used to analyze the plasma environment. Reductive perturbation technique (RPT) and small k expansion technique (SKET) are used for deducing the Zakharov-Kuznetsov (ZK) equation and obtaining the growth rate (GR) of instability DAWs, respectively. The variation of dispersion relation (DR), profile, and instability GR of DAWs with superthermal spectral index, cutoff parameter, external magnetic field, plasma temperature, and density has been discussed. It indicates that the increasing superthermal spectral index and the decreasing cutoff parameter lead to the increasing frequency. The instability GR raises slowly with the increscent superthermal spectral index and decreasing cutoff parameter. In space environments, these interesting results will be important for a positively charged dust plasma with regularized <span>(kappa )</span> distributed electrons in the presence of polarization force.</p></div>","PeriodicalId":499,"journal":{"name":"Brazilian Journal of Physics","volume":"55 1","pages":""},"PeriodicalIF":1.5,"publicationDate":"2024-11-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142645661","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 Magnetic and Dielectric Properties of Nanofibric Spinel Oxides ACo2O4 (A = Co, Ni, and Fe) Under Low Magnetic Field 低磁场下纳米纤维尖晶石氧化物 ACo2O4（A = Co、Ni 和 Fe）的磁性和介电性质研究

IF 1.5 4区物理与天体物理

Brazilian Journal of Physics Pub Date : 2024-11-15 DOI: 10.1007/s13538-024-01646-0

Aeshah Alasmari, Mohammad Shariq, Norah Algethami, Zaina S. Algarni, Khairiah Alshehri, Eman Almutib, Yasir Altowairqi, A. Almalki, Y. Slimani, Mushtaq Hussain

{"title":"Investigation of Magnetic and Dielectric Properties of Nanofibric Spinel Oxides ACo2O4 (A = Co, Ni, and Fe) Under Low Magnetic Field","authors":"Aeshah Alasmari, Mohammad Shariq, Norah Algethami, Zaina S. Algarni, Khairiah Alshehri, Eman Almutib, Yasir Altowairqi, A. Almalki, Y. Slimani, Mushtaq Hussain","doi":"10.1007/s13538-024-01646-0","DOIUrl":"10.1007/s13538-024-01646-0","url":null,"abstract":"<div><p>In this study, nanofibric cobaltites were synthesized using the electrospinning technique. The research focuses on how Ni and Fe cation substitutions affect the magnetic and dielectric properties of ACo<sub>2</sub>O<sub>4</sub>. X-ray diffraction analysis confirmed that all synthesized samples possess a cubic spinel structure. FESEM revealed that the cobaltite samples have a nanofibric morphology composed of interconnected nanoparticles. The dielectric properties of these spinel cobaltites were examined in low magnetic fields ranging from 0 to 10 mT. Using the Maxwell–Wagner model, the study demonstrates that the transport properties of spinel cobaltites can be modulated by an external magnetic field. Dielectric plots of various magnetic spinel cobaltites showed reduced resistance in the presence of a magnetic field, underscoring the significant impact of magnetic fields on the transport properties of these materials. The research also highlights the crucial role of interconnected grains and grain boundary effects on the transport mechanisms. This study provides valuable insights into the tunable transport properties of spinel cobaltites, potentially leading to advancements in their application in magnetic and dielectric devices.</p></div>","PeriodicalId":499,"journal":{"name":"Brazilian Journal of Physics","volume":"55 1","pages":""},"PeriodicalIF":1.5,"publicationDate":"2024-11-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142645745","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 an Imprecise Fractional-Order Eco-epidemiological Model with Various Forms of Prey Refuges and Predator Harvesting 分析具有各种猎物庇护所和捕食者捕杀形式的不精确分数阶生态流行病学模型

IF 1.5 4区物理与天体物理

Brazilian Journal of Physics Pub Date : 2024-11-12 DOI: 10.1007/s13538-024-01633-5

Subrata Paul, Sanjoy Mahato, Animesh Mahata, Sanat Kumar Mahato, Supriya Mukherjee, Banamali Roy

引用次数: 0

First-Principles Investigation of the OsI(_{2}) Monolayer: A Novel Two-Dimensional Dihalide Material for Optoelectronic Applications OsI(_{2}) 单层的第一原理研究：用于光电应用的新型二维二卤化物材料

IF 1.5 4区物理与天体物理

Brazilian Journal of Physics Pub Date : 2024-11-12 DOI: 10.1007/s13538-024-01642-4

W. O. Santos, L. S. Barbosa, E. Moreira, D. L. Azevedo

{"title":"First-Principles Investigation of the OsI(_{2}) Monolayer: A Novel Two-Dimensional Dihalide Material for Optoelectronic Applications","authors":"W. O. Santos, L. S. Barbosa, E. Moreira, D. L. Azevedo","doi":"10.1007/s13538-024-01642-4","DOIUrl":"10.1007/s13538-024-01642-4","url":null,"abstract":"<div><p>The study of two-dimensional (2D) materials has attracted considerable attention from material scientists globally, mainly because of their distinct electronic, spintronic, magnetic, and optoelectronic characteristics. Transition metal dichalcogenides (TMD) and dihalides (TMDH) are two examples of 2D materials. This study investigates the structural stability, phonon dispersion, electronic, optical, and thermodynamic properties of the unique trigonal osmium diiodide (OsI<span>(_2)</span>) monolayer, which is an example of TMDH. The well-established Density Functional Theory (DFT) is employed for this purpose. We identified an indirect bandgap semiconductor property in this monolayer. The energy bandgap values for GGA-PBE, GGA-PBEsol, and the hybrid functional HSE06 were found to be 1.72, 1.56, and 2.86 eV, respectively. The compound OsI<span>(_2)</span> demonstrates structural stability, and studies of phonon dispersion indicate that there are no virtual (negative) phonon frequencies. Furthermore, OsI<span>(_2)</span> demonstrates optical absorption within the visible spectrum, making it suitable for optoelectronic applications. However, thermodynamic property calculations have shown that the synthesis of the OsI<span>(_2)</span> monolayer would occur naturally at temperatures lower than room temperature, as evidenced by the free energy estimates.</p></div>","PeriodicalId":499,"journal":{"name":"Brazilian Journal of Physics","volume":"55 1","pages":""},"PeriodicalIF":1.5,"publicationDate":"2024-11-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142600722","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 the FENE Model to Polymer Rupture 从 FENE 模型到聚合物断裂

IF 1.5 4区物理与天体物理

Brazilian Journal of Physics Pub Date : 2024-11-12 DOI: 10.1007/s13538-024-01650-4

Humberto Belich, Marcio Ferreira Martins, Ramon Silva Martins, Leandro Silva Amorim, Eduardo Marques Vieira

引用次数: 0

Classical Stochastic Representation of Quantum Mechanics 量子力学的经典随机表征

IF 1.5 4区物理与天体物理

Brazilian Journal of Physics Pub Date : 2024-11-12 DOI: 10.1007/s13538-024-01649-x

Mário J. de Oliveira

引用次数: 0

Structural Modifications of CdS/Graphene Oxide with Ionic Dopants of Fe/Ag for Degradation of Methylene Blue 利用铁/银离子掺杂剂对 CdS/石墨烯氧化物进行结构改性以降解亚甲基蓝

IF 1.5 4区物理与天体物理

Brazilian Journal of Physics Pub Date : 2024-11-12 DOI: 10.1007/s13538-024-01637-1

Dalia Abdrabou, M. K. Ahmed, Sh. A. Khairy, H. H. Hassan, Th. M. El-Sherbini

{"title":"Structural Modifications of CdS/Graphene Oxide with Ionic Dopants of Fe/Ag for Degradation of Methylene Blue","authors":"Dalia Abdrabou, M. K. Ahmed, Sh. A. Khairy, H. H. Hassan, Th. M. El-Sherbini","doi":"10.1007/s13538-024-01637-1","DOIUrl":"10.1007/s13538-024-01637-1","url":null,"abstract":"<div><p>Global demand for pollution removal agents requires advanced materials to provide a good protocol to keep clean water resources. The composition of CdS was modified with ionic dopants including iron (Fe) and silver (Ag) and is incorporated into graphene oxide (GO) nanoparticles. The obtained compositions are CdS, Fe-CdS, Ag-CdS, CdS@GO, Fe-CdS@GO, and Ag-CdS@GO that have been fabricated by the co-precipitation method and examined by several techniques to estimate the morphological, optical, and structural properties using TEM, SEM, UV–Vis analysis, and XRD. The crystallite size of the CdS@Go was measured using the Williamson-Hall (W–H) method and was found to be around 28.6 nm. Furthermore, the a-axis was found to be 5.78 Å and 5.80 Å for cubic crystals and the a-axis achieved 14.28 to 14.24 Å for an orthorhombic crystal of CdS, respectively. The average roughness varied from 32.30 ± 3.3 to 66.65 ± 10.9 nm for CdS and Ag-CdS@GO. The degradation of methylene blue (MB) is increased from 75.56, 73.87, 76.01, 81.53, 89.34, and 91.68% for CdS, Fe-CdS, Ag-CdS, CdS@GO, Fe-CdS@GO, and Ag-CdS@GO after 60 min of exposure under visible light irradiation. The pseudo-first-order constant (K<sub>app</sub>) is increased from 4.4 × 10<sup>−3</sup> to 39.4 × 10<sup>−3</sup> min<sup>−1</sup> for CdS and Ag-CdS@GO.</p></div>","PeriodicalId":499,"journal":{"name":"Brazilian Journal of Physics","volume":"55 1","pages":""},"PeriodicalIF":1.5,"publicationDate":"2024-11-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://link.springer.com/content/pdf/10.1007/s13538-024-01637-1.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142600649","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Development of an Anthracene-Coated SMF-MMF-SMF Sensor for Low-Dose UV Radiation Detection and Dosimetry 开发用于低剂量紫外线辐射检测和剂量测定的蒽涂层 SMF-MMF-SMF 传感器

IF 1.5 4区物理与天体物理

Brazilian Journal of Physics Pub Date : 2024-11-09 DOI: 10.1007/s13538-024-01652-2

Maher Khaleel Ibrahim, Aseel I. Mahmood, Sawsan Kh. Fandi, Jamal M. Rzaij

{"title":"Development of an Anthracene-Coated SMF-MMF-SMF Sensor for Low-Dose UV Radiation Detection and Dosimetry","authors":"Maher Khaleel Ibrahim, Aseel I. Mahmood, Sawsan Kh. Fandi, Jamal M. Rzaij","doi":"10.1007/s13538-024-01652-2","DOIUrl":"10.1007/s13538-024-01652-2","url":null,"abstract":"<div><p>This study evaluates the efficacy of a single-mode, multimode, and single-mode (SMF-MMF-SMF) fiber configuration for low-dose optical radiation monitoring applications, such as UV detection and dosimetry. Particular attention is devoted to radiation-induced absorption (RIA) and radiation-induced refractive index change (RIRIC). Radiation exposure alters the refractive index of fiber materials, resulting in a shift in the peak wavelength. This study utilized a multimode fiber with a core diameter of 65 μm, and its sensing region was coated with anthracene solutions at varying concentrations of 1 wt%, 3 wt%, and 5 wt%. The experimental findings demonstrate that RIRIC and RIA depend on the energy of the applied radiation for all sensor configurations. A discernible shift in the peak wavelength was observed. When the impact of anthracene concentration on sensor efficiency was examined, the sensitivity of the 3 wt% solution was higher than that of the 1 wt% and 5 wt% solutions. This work contributed to the advancement of optical fiber sensor technology, specifically in the context of radiation detection. The results may encourage further exploration of hybrid fiber configurations and functional coatings, opening new avenues for the next-generation fiber optic dosimeters.</p></div>","PeriodicalId":499,"journal":{"name":"Brazilian Journal of Physics","volume":"55 1","pages":""},"PeriodicalIF":1.5,"publicationDate":"2024-11-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142598906","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

Techniques for Searching for Anisotropy in the Arrival Directions of Ultra-High Energy Cosmic Rays 搜索超高能量宇宙射线到达方向各向异性的技术

IF 1.5 4区物理与天体物理

Brazilian Journal of Physics Pub Date : 2024-11-08 DOI: 10.1007/s13538-024-01640-6

Diego C. dos Santos, Rogerio M. de Almeida, João R. T. de Mello Neto, Bruno L. Lago

{"title":"Techniques for Searching for Anisotropy in the Arrival Directions of Ultra-High Energy Cosmic Rays","authors":"Diego C. dos Santos, Rogerio M. de Almeida, João R. T. de Mello Neto, Bruno L. Lago","doi":"10.1007/s13538-024-01640-6","DOIUrl":"10.1007/s13538-024-01640-6","url":null,"abstract":"<div><p>Understanding the origin and distribution of ultra-high-energy cosmic rays (UHECRs) remains a cornerstone challenge in astrophysics. These cosmic rays, with energies exceeding 8 EeV, provide insights into the most energetic phenomena in the universe. In this paper, we review and apply various statistical and analytical techniques to a simulated dataset to investigate the anisotropy in the arrival directions of UHECRs with energies exceeding 8 EeV. We simulate cosmic-ray events based on the distribution of local matter from the 2MASS Redshift Survey, supplemented with an isotropic background component, to create a robust dataset for analysis. Our methods include blind searches for excesses over the sky, Rayleigh analysis in right ascension, reconstruction of dipole and quadrupole moments using spherical harmonics, and the angular power spectrum technique — a method extensively utilized in cosmic microwave background studies — to assess anisotropies across multiple angular scales. The results underscore the potential of these methodologies to reveal significant anisotropies and contribute to our understanding of the possible extragalactic sources and propagation mechanisms of UHECRs.</p></div>","PeriodicalId":499,"journal":{"name":"Brazilian Journal of Physics","volume":"55 1","pages":""},"PeriodicalIF":1.5,"publicationDate":"2024-11-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142595947","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

Dynamics of Soliton Collision in DNA Double Helix DNA 双螺旋中的孤子碰撞动力学

IF 1.5 4区物理与天体物理

Brazilian Journal of Physics Pub Date : 2024-11-07 DOI: 10.1007/s13538-024-01632-6

Christy Maria Joy, L. Kavitha

引用次数: 0