Indian Journal of Physics最新文献

{"title":"Investigation of characteristics of ionospheric vertical plasma drift during sunset over the mid-latitude station Nicosia, Cyprus","authors":"Blessy Varghese, Haris Haralambous, Christina Oikonomou, Tiju Joseph Mathew, Patrick Dandenault","doi":"10.1007/s12648-024-03414-x","DOIUrl":"https://doi.org/10.1007/s12648-024-03414-x","url":null,"abstract":"<p>This study investigates the characteristics of the vertical component of the ionospheric F2 layer plasma drift over the mid-latitude station of Nicosia, Cyprus (<span>(hbox {35}^{circ }hbox {N})</span>, <span>(hbox {33}^{circ }hbox {E})</span>, at magnetic dip angle, <span>(hbox {I}=hbox {51.7}^{circ })</span>), during pre- and post-sunset hours using digisonde data from November 2013 to October 2014. The observations demonstrate significant seasonal dependence in the vertical plasma drift during post-sunset hours. Vertical velocity shows a regular upward enhancement and notable oscillations during the evening in all seasons, with time variation dependent on the seasonal variability of sunset. The upward enhancement during sunset is typically attributed to chemical loss. However, the present study shows that the critical plasma frequency does not decrease significantly during sunset. Therefore, the observed velocity enhancement may not be solely attributed to recombination effects after sunset. It might be influenced by wind-driven electric fields. Wavelet analysis reveals wave activity around sunset, suggesting that the oscillations may be excited by the Solar Terminator.</p>","PeriodicalId":584,"journal":{"name":"Indian Journal of Physics","volume":"31 1","pages":""},"PeriodicalIF":2.0,"publicationDate":"2024-09-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142258224","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":"Determination of the optical properties of tungsten trioxide thin film using the transfer matrix method","authors":"Muhammad Adnan, M. Imran Jamil, Bilal Ramzan, Tanvir Hussain, Afaq Ahmad, Muhammad Usman Ghani","doi":"10.1007/s12648-024-03401-2","DOIUrl":"https://doi.org/10.1007/s12648-024-03401-2","url":null,"abstract":"<p>Transfer-matrix method (TMM) in optics serves as a robust mathematical formalism for determining the transmittance of electromagnetic waves through a slab, thin film, or multi-layered structure. A plane electromagnetic (PEM) wave impinges at an angle to the normal of a slab or multi-layered structure and interacts with the material. A portion of this light passes through the first interface and then propagates in the material. Finally, it leaves the second interface of the material and carries information about the material. This formalism models the experimental transmittance spectra of <span>(WO_3)</span> thin film prepared by a thermal evaporation method. The spectral variations of the transmission coefficient and refractive index of <span>(WO_3)</span> are derived using the TMM approach, demonstrating concordance with the experimental data.</p>","PeriodicalId":584,"journal":{"name":"Indian Journal of Physics","volume":"26 1","pages":""},"PeriodicalIF":2.0,"publicationDate":"2024-09-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142258222","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":"The effect of gravity on a nonlocal fiber-reinforced thermoelastic solid with reference temperature-dependent material properties via various theories","authors":"Samia M. Said,&nbsp;Mohamed I. A. Othman","doi":"10.1007/s12648-024-03369-z","DOIUrl":"10.1007/s12648-024-03369-z","url":null,"abstract":"<div><p>The goal of this work is to examine the effect of the gravity on a nonlocal fiber-reinforced half-space with reference temperature-dependent material properties. The three-phase lag model, the type III Green–Naghdi theory, and the Lord–Shulman theory all with memory-dependent derivatives are taken into consideration while analyzing the issue. To derive the precise formulations of physical fields, the harmonic wave analysis method is used. To quantify the impact of temperature-dependent on the characteristics of the medium and gravity, graphs are used. It is found that the physical quantities are affected by gravity, the nonlocal parameter, and reference temperature-dependent material properties. The method that was used in the present article is applicable to a wide range of problems in hydrodynamics and thermoelasticity.</p></div>","PeriodicalId":584,"journal":{"name":"Indian Journal of Physics","volume":"99 4","pages":"1439 - 1445"},"PeriodicalIF":1.6,"publicationDate":"2024-09-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://link.springer.com/content/pdf/10.1007/s12648-024-03369-z.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142258225","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}

{"title":"Search for new physics with reactor neutrino at Kuo-Sheng neutrino laboratory","authors":"S. Karmakar, M. K. Singh, S. Karadaǧ, H. T. Wong, H. B. Li, V. Sharma, C. Greeshma, M. K. Singh, L. Singh, F. K. Lin, V. Singh","doi":"10.1007/s12648-024-03406-x","DOIUrl":"https://doi.org/10.1007/s12648-024-03406-x","url":null,"abstract":"<p>The observation of coherent elastic neutrino nucleus scattering by the COHERENT collaboration alongside a positive hint from the DRESDEN−II experiment propelled the study of neutrino physics beyond the Standard Model. In the current work we have explored the light mediator models scenario, along with the neutrino non-standard interactions. Apart from a very good sensitivity to study these physics scenarios, reactor neutrinos provide the benefit of working in the fully coherent region due to their abundant low energy flux. The analyzed data set in the present work comprised of 124.2(70.3) kg day reactor ON(OFF) exposure collected at Kuo-Sheng neutrino laboratory with high purity <i>n</i>-type point Germanium detector. To assess the potential influence of the quenching factor on the limits obtained, we varied the parameter <i>k</i> in the Lindhard model within three scenarios: conservative (0.157), intermediate (0.200), and optimistic (0.260). These choices encompass a range of currently favored values. In the absence of any discernible excess at low energy in the measured spectrum for the considered physics scenarios, we have established competitive limits with the contemporary experiments specifically focused to search for coherent elastic neutrino nucleus scattering.</p>","PeriodicalId":584,"journal":{"name":"Indian Journal of Physics","volume":"22 1","pages":""},"PeriodicalIF":2.0,"publicationDate":"2024-09-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142215875","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":"Enhancing power conversion efficiency of lead-free perovskite solar cells: a numerical simulation approach","authors":"Aditi Thakur,&nbsp;Dhawan Singh","doi":"10.1007/s12648-024-03365-3","DOIUrl":"10.1007/s12648-024-03365-3","url":null,"abstract":"<div><p>Recent research in environmentally friendly lead-free perovskite solar cells have made tremendous progress with their rapid improvements in performance and on the verge of commercialisation. In this research, a numerical simulation-based analysis of MASnI₃ with different transport layer materials are performed to enhance the efficacy. The finding shows, an optimized device architecture comprising of Cu₂O as a hole transport layer and TiO₂ as an electron transport layer achieves the highest power conversion efficiency of 27.21%, open-circuit voltage of 0.99 V, short circuit current density of 33.83 mA/cm², and fill factor of 81.12%, respectively. Moreover, the proposed model results have been compared with the recently published lead-free literature and found to have improvement in performance. Furthermore, the impact of several significant parameter on system performance is thoroughly analysed and optimised. This covers effect of temperature change, absorber thickness, total defect density, acceptor density of absorber along with others. Henceforth, the proposed research work will expand the possibilities of designing high-performance lead-free perovskite solar cells experimentally in future research.</p></div>","PeriodicalId":584,"journal":{"name":"Indian Journal of Physics","volume":"99 4","pages":"1479 - 1493"},"PeriodicalIF":1.6,"publicationDate":"2024-09-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142215876","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":"A novel analysis of the fractional Cauchy reaction-diffusion equations","authors":"Deepak Umarao Sarwe, A. Stephan Antony Raj, Pushpendra Kumar, Soheil Salahshour","doi":"10.1007/s12648-024-03411-0","DOIUrl":"https://doi.org/10.1007/s12648-024-03411-0","url":null,"abstract":"<p>This article considers the Cauchy reaction-diffusion equations and derives the numerical solutions using the fractional natural decomposition method (FNDM). The projected solution approach works without conversion or perturbation. The examples confirm the method’s accuracy and reliability, allowing for fractional order studies in real-world problems. Plots and tables validate the accuracy of the proposed scheme. This research reveals the influences of temporal history in the fractional Cauchy reaction-diffusion equations, which is the novelty of this work.\u0000</p>","PeriodicalId":584,"journal":{"name":"Indian Journal of Physics","volume":"35 1","pages":""},"PeriodicalIF":2.0,"publicationDate":"2024-09-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142215874","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":"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}