Indian Journal of Physics最新文献

{"title":"Investigation of rogue wave and dynamic solitary wave propagations of the $$mathbf{M}$$ -fractional (1 + 1)-dimensional longitudinal wave equation in a magnetic-electro-elastic circular rod","authors":"Md. Mamunur Roshid, Mahtab Uddin, Mohammad Mobarak Hossain, Harun-Or-Roshid","doi":"10.1007/s12648-024-03409-8","DOIUrl":"https://doi.org/10.1007/s12648-024-03409-8","url":null,"abstract":"<p>The longitudinal wave equation (LWE) is crucial for understanding the dynamic behavior of the material in a magneto-electro-elastic (MEE) circular rod. This equation describes the propagation of longitudinal waves along the rod’s length, accounting for the interactions between mechanical, electrical, and magnetic fields within the material. By considering properties such as mass density and stress–strain relationships, the equation elucidates how longitudinal waves propagate through the MEE rod, influenced by its magneto-electro-elastic nature. In this study, we employ two robust techniques using a truncated <span>(M)</span>-fractional derivative to integrate the time-fractional longitudinal wave equation (LWE). The simplest equation (SE) technique and the novel modified Kudryashov (NMK) technique are used to obtain additional solitary wave solutions to the LWE. These solutions are analyzed using the NMK and SE techniques, forming trigonometric, hyperbolic, and exponential functional solutions. We demonstrate new phenomena from the numerical conditions of the derived soliton solutions of the time <span>(M)</span>-fractional LWE model. We verify the behavior of the <span>(M)</span>-fractional parameter with two-dimensional charts and compare the effects of the <span>(M)</span>-fractional derivative with the classical derivative form using various graphical systems. The NMK technique reveals bright and dark bell-shaped waves, periodic waves, linked periodic rogue waves, and periodic rogue waves with curved bell-shaped wave patterns. Similarly, the SE technique produces bright and dark bell-shaped waves, linked periodic rogue waves, periodic rogue waves with curved bell-shaped waves, and periodic wave patterns. As a result, these techniques are demonstrated to be useful tools for producing distinct, accurate solitary wave solutions for various applications. These applications are critical in fields such as materials science, ecology, sociology, and urban planning, where understanding the collective behavior of individuals within a spatial context is essential.</p>","PeriodicalId":584,"journal":{"name":"Indian Journal of Physics","volume":"64 1","pages":""},"PeriodicalIF":2.0,"publicationDate":"2024-09-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142215877","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}

{"title":"Spectroscopic studies of pure and malachite green doped polyvinylidene fluoride samples using XRD, FTIR and UV techniques","authors":"Girja Ahirwar, P. K. Khare, R. K. Dubey","doi":"10.1007/s12648-024-03398-8","DOIUrl":"https://doi.org/10.1007/s12648-024-03398-8","url":null,"abstract":"<p>Polyvinylidene fluoride (PVDF) and malachite green (MG) doped PVDF samples have been prepared using isothermal immersion technique and were characterized by using Fourier transform infrared (FTIR), X-ray diffraction and ultra violet techniques. FTIR spectra reveals that all stretching, bending vibrations, α and β phases are present in pure and doped PVDF samples. Dislocation density, d- spacing, micron strain and band gap using Tauc’s relation have been calculated. The change in crystalline nature and crystalline size were investigated. Amorphous nature, full width at half maximum, dislocation density and micro strain increases while crystalline size and d- spacing decreases with increasing MG in PVDF. Absorbance versus wavelength spectra of pure PVDF and malachite green doped PVDF samples have been observed in 200–800 nm wavelength range. Variation in band gap recorded in the range 4.65–472 eV. Also with increase in concentration of malachite green, band gap decreases and intensity of absorption band increases.</p>","PeriodicalId":584,"journal":{"name":"Indian Journal of Physics","volume":"3 1","pages":""},"PeriodicalIF":2.0,"publicationDate":"2024-09-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142215878","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}

{"title":"f(Q, T) gravity: from early to late-time cosmic acceleration","authors":"Surajit Das, Sanjay Mandal","doi":"10.1007/s12648-024-03400-3","DOIUrl":"https://doi.org/10.1007/s12648-024-03400-3","url":null,"abstract":"<p>In this article, we explore the comprehensive narrative of cosmic evolution within a cosmological framework by utilizing a novel form of gravity known as generalized symmetric teleparallel gravity, denoted as <i>f</i>(<i>Q</i>, <i>T</i>) gravity. Here, <i>Q</i> represents the non-metricity scalar, while <i>T</i> denotes the trace of the energy-momentum tensor. We present and analyze two distinct <i>f</i>(<i>Q</i>, <i>T</i>) cosmological models, each characterized by its unique Lagrangian. Our investigation delves into the cosmological parameters of these models, scrutinizing various energy conditions, examining the inflationary dynamics of the early universe through scalar field formulations, and probing the mysterious nature of dark energy using statefinder diagnostics and <span>((omega -omega '))</span> phase space analysis. Ultimately, our findings offer a comprehensive account of cosmic evolution, spanning from the early universe to its late-time evolution.</p>","PeriodicalId":584,"journal":{"name":"Indian Journal of Physics","volume":"42 1","pages":""},"PeriodicalIF":2.0,"publicationDate":"2024-09-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142215879","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}

{"title":"Many-body localization properties of disordered interacting fermionic systems","authors":"K. Yapara, E. N. Djoukouo, C. Bouri, M. H. B. Mackongo, M. G. Kwato Njock","doi":"10.1007/s12648-024-03399-7","DOIUrl":"https://doi.org/10.1007/s12648-024-03399-7","url":null,"abstract":"<p>This work aimed at investigating the Many-Body Localization transition in discrete disordered interacting fermionic systems when the second nearest-neighbor hoppings are considered. We studied small system sizes of spinless fermions located in a one-dimensional disordered optical lattice. Considering the disorder strength, we focused our attention on the eigenvalues and eigenstates properties of the quantum many-body system such as the level-spacing statistics and the Kullback–Leibler divergence and the entropy. As a result, the shapes of the probability distributions showed that the systems undergo delocalized and localized regimes for low and high disorder strengths respectively.</p>","PeriodicalId":584,"journal":{"name":"Indian Journal of Physics","volume":"277 1","pages":""},"PeriodicalIF":2.0,"publicationDate":"2024-09-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142215781","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}

{"title":"Propagation of dust lower hybrid wave in dusty magneto dense plasma with polarization force effect","authors":"Aleena Yaseen, Zahid Mir, Bilal Ramzan","doi":"10.1007/s12648-024-03394-y","DOIUrl":"https://doi.org/10.1007/s12648-024-03394-y","url":null,"abstract":"<p>Dust charge polarization effects on the propagation of dust lower hybrid wave is studied in dusty magneto-dense plasma. Quantum effects are incorporated due to Fermi’s degenerate pressure, Bohm tunneling potential and exchange correlation potential for electrons only. Magnetic effects are taken into account for ions, however, charged dust has polarizing effects on electrostatic wave propagation. The Quantum Hydrodynamic Model is used to construct a linear dispersion relation, and the findings are visually shown to highlight the electrostatic mode’s propagation and growth rate in the dense plasma environment.</p>","PeriodicalId":584,"journal":{"name":"Indian Journal of Physics","volume":"3 1","pages":""},"PeriodicalIF":2.0,"publicationDate":"2024-09-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142215780","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}

{"title":"DFT study of electronic structure, magnetic and optical properties of Zr based full-Heusler alloys Zr2FeZ (Z = Al, Ga, In)","authors":"A. Amudhavalli, P. Dharmaraja, M. Manikandan, R. RajeswaraPalanichamy, K. Iyakutti","doi":"10.1007/s12648-024-03367-1","DOIUrl":"https://doi.org/10.1007/s12648-024-03367-1","url":null,"abstract":"<p>Ab-initio calculations are carried out to analyze the half metallic and ferromagnetic property of full-Heusler alloys Zr₂FeZ (Z = Al, Ga, In) with both Cu₂MnAl (L2₁) and Hg₂CuTi (XA) structures. The ground state energy of both the structures predicted that ferromagnetic state is stable compared to the non- magnetic state. In the Cu₂MnAl structure, these full Heusler alloys are metallic. The spin up state is found to be metallic and spin down state is observed as semiconducting in Hg₂CuTi structure, which predicts that these alloys are half metallic in Hg₂CuTi structure. The band structure of spin down state revealed that these alloys have an indirect band gap. For these Zr₂FeZ (Z = Al, Ga, In) full Heusler alloys, the total magnetic moment calculated is to be around 1µB. The Slater Pauling rule <i>μ</i>_<i>t</i> = <i>Z</i>_<i>t</i> − 18 is obeyed. The optical parameters, such as, dielectric function, energy loss function, refractive index, reflectivity, absorption and extinction coefficients are reported. For spintronic devices, these new Zr-based Heusler alloys can be used.</p>","PeriodicalId":584,"journal":{"name":"Indian Journal of Physics","volume":"6 1","pages":""},"PeriodicalIF":2.0,"publicationDate":"2024-09-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142215793","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}

{"title":"Room temperature AC properties and impedance analysis of Mg ferrite/polypyrrole (PPy) and Mg ferrite/reduced graphene oxide (rGO) composites","authors":"Bilal Ibrahim, Samia A. Saafan, R. E. El Shater, Maha K. Omar","doi":"10.1007/s12648-024-03372-4","DOIUrl":"https://doi.org/10.1007/s12648-024-03372-4","url":null,"abstract":"<p>The auto-combustion sol–gel method has been used to synthesize a powder sample of MgFe₂O₄ nanoparticles. Nanocomposites of Mg-ferrite/PPy and Mg-ferrite/rGO have been prepared by thorough physical mixing, with weight ratios of 20% PPy and 20% rGO, respectively. To have a full insight into the materials, their structural properties have been investigated by means of X-ray diffraction (XRD), scanning electron microscopy (SEM), energy-dispersive X-ray spectroscopy (EDX), and Fourier transform infrared spectroscopy (FT-IR). DC conductivity has been investigated too, and by comparing the results, it has been observed a significant increase in the DC conductivity of the Mg-ferrite/PPy composite sample compared to the corresponding Mg-ferrite/rGO sample, a finding that would potentially impact the composite’s applications. The discussion of the frequency dependence of ε′, σ_ac, and tan(δ) in these composite samples revolves around the concept of Maxwell–Wagner interfacial polarization. The sample Cole–Cole plots show distinct areas where incomplete semicircles overlap, each representing a different conduction process. These semicircles correspond to two equivalent circuits of parallel resistor–capacitor (R–C) combinations connected in series. Finally, it could be concluded that the new nanocomposite samples of MgFe₂O₄/20% rGO and MgFe₂O₄/20% PPy show dielectric properties that may be a stimulus for more studies in future work, where they are expected to be promising candidates for supercapacitor applications.</p>","PeriodicalId":584,"journal":{"name":"Indian Journal of Physics","volume":"52 1","pages":""},"PeriodicalIF":2.0,"publicationDate":"2024-09-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142215850","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}

{"title":"Cosmic Evolution of the Kantowski-Sachs Universe in the Context of a Bulk Viscous String in Teleparallel Gravity","authors":"S. R. Bhoyar, Yash B. Ingole","doi":"10.1007/s12648-024-03405-y","DOIUrl":"https://doi.org/10.1007/s12648-024-03405-y","url":null,"abstract":"<p>In the present work, we analyzed the Kantowski-Sachs cosmological model and teleparallel gravity, where a bulk viscous fluid containing one-dimensional cosmic strings is the source for the energy−momentum tensor. To obtain the deterministic solution of the field equations, we employed the proportionality condition linking the shear scalar <span>((sigma ))</span> and the expansion scalar <span>((theta ))</span>, establishing a relationship between metric potentials. Another approach employed is the hybrid expansion law (HEL). The discussion focuses on the behavior of the accelerating universe concerning the specific choice of a nonlinear (or power law model) of teleparallel gravity <span>(f(T)=alpha T + beta T^m)</span>, where <i>T</i> is the torsion scalar, <span>(alpha)</span>, and <span>(beta)</span> are model parameters and <i>m</i> is restricted to greater than or equal to 2. The effective equation of the state parameter <span>((omega _{eff}))</span> of models will support the acceleration of the universe. We observed that the null and weak energy conditions are obeyed but violate the strong energy condition as per the present accelerating expansion. Under specific model parameter constraints, the universe shows a transition from a decelerating to an accelerating phase.\u0000</p>","PeriodicalId":584,"journal":{"name":"Indian Journal of Physics","volume":"15 1","pages":""},"PeriodicalIF":2.0,"publicationDate":"2024-09-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142215784","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}

{"title":"Relativistic star with Bose–Einstein condensate core and polytropic envelope in Karmarkar regime","authors":"Amos V. Mathias, Jefta M. Sunzu, Jason M. Mkenyeleye","doi":"10.1007/s12648-024-03408-9","DOIUrl":"https://doi.org/10.1007/s12648-024-03408-9","url":null,"abstract":"<p>A new anisotropic star model with core-envelope division is generated. The star is assumed to have the core composed of Bose–Einstein Condensate matter and polytropic envelope. The interior space-time is considered to be static and spherically symmetric in relativistic framework. We specify one of the gravitational potentials <span>(e^{lambda })</span> and <span>(e^{nu })</span> and then apply the Karmarkar condition to generate our model. The model formulated is free from central singularities and is verified by various stability tests and energy conditions. The equilibrium of the present model is examined by analysing TOV-equation. Stellar masses and radii of compact fluid spheres consistent with observations including Vela X-1, PSRJ1903+327, Cen X-3 and Her X-1 have been generated by using this model. The profiles for the matter variables in the present model are well behaved. It is entrancing to note that a multi-layered star model with core admitting Bose–Einstein condensate equation of state in embedding setting is missing in the previous studies.</p>","PeriodicalId":584,"journal":{"name":"Indian Journal of Physics","volume":"20 1","pages":""},"PeriodicalIF":2.0,"publicationDate":"2024-09-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142215783","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}

{"title":"Heavy ion fusion simulation in key parameters optimization using multilayer fuel target and the effectiveness of ponderomotive force in ion acceleration","authors":"A A Shayanmoghadam, S N Hosseinimotlagh, S M R Reisosadat","doi":"10.1007/s12648-024-03397-9","DOIUrl":"https://doi.org/10.1007/s12648-024-03397-9","url":null,"abstract":"<p>In heavy ion fusion through Inertial Confinement Fusion, key points such as the production and driver energy delivery, fuel pellet design, physics of fuel pellet implosion, nuclear fusion reactor design, etc. are important. In this paper, we determine the stopping power, deposited energy, and the produced flux of secondary particles using the irradiation of multilayer spherical fuel pellet containing DT, D³He, and p¹¹B by Pb and Cs heavy ion beams with energies of 8 and 10 GeV via GEANT4 simulation code, respectively. This work shows that by changing the selected heavy ion beam and its energy, as well as by changing the thickness of the layers and the type of ingredients in the fuel pellet, the obtained results change. The optimum gain of the deposited energy due to the choice of two selective heavy ion beams Pb and Cs that we obtained in this study, is related to the DT target compared to the two aneutronic targets of D³He and P¹¹B in both energy 8 and 10 GeV. Finally, we use laser-plasma accelerator and determine theoretically the ponderomotive force.</p>","PeriodicalId":584,"journal":{"name":"Indian Journal of Physics","volume":"101 1","pages":""},"PeriodicalIF":2.0,"publicationDate":"2024-09-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142215782","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}