Chinese Journal of Physics最新文献

{"title":"Exploring the dynamics of the heavy magnetized dusty plasma in laboratory experiments and solar wind interaction with lunar terminator: Theoretical predictions into the role of polarization force","authors":"M.S. Afify ,&nbsp;A.M. Abdelghany","doi":"10.1016/j.cjph.2024.09.012","DOIUrl":"10.1016/j.cjph.2024.09.012","url":null,"abstract":"<div><div>This study is motivated by the lack of research that connects the dynamics of space dusty plasma (DP) with the existing experimental findings and the role of the magnetic field in the case of massive DP. For that purpose, we presented a theoretical interpretation of the dynamics of strongly (experimental) and weakly (space) magnetized DP, including the influence of the polarization force (PF). We used the multifluid model to describe the dynamics of dust particles while the hot plasma of electrons and ions is described by the Boltzmann distribution. We derived the dispersion relation to investigate the behavior of the compressive dust-acoustic waves (DAWs). To get a full picture of the mechanism of dust particles, we used the reductive perturbation technique to obtain the periodic solution for the Zakharov–Kuznetsov equation (ZK), which is coincidental with the observed wave profiles. In the case of the experimental application, we observed that the non-propagating instability starts at a small value of the polarization parameter (<span><math><mi>R</mi></math></span>), which is 0.02. Therefore, for values of <span><math><mi>R</mi></math></span> less than 0.02, the linear analysis revealed that increasing the value of the polarization parameter is not significant in distinguishing the growth rates. Moreover, we noted that both <span><math><mi>R</mi></math></span> and the applied magnetic field enhance the strength of the wave electric field. Interestingly, calculating the value of the electric field required to levitate the dust particles that are subject to a high magnetic field agrees with our theoretical findings. The current model has also been applied to DP observed in the lunar terminator. Our results reveal no role for the PF in the lunar terminator. The analysis conducted using the New Hampshire Dispersion Relation Solver (NHDS) confirms the dominance of electrostatic modes in response to the solar wind interaction with the lunar terminator. Moreover, at certain values of plasma parameters such as the temperature of solar wind electrons and ions and the density of dust particles and solar wind electrons, there is a cutoff in the fluid dispersion curve corresponding to certain values of the normalized wavenumber. Such electrostatic profiles could contribute to the observed glow in the horizontal direction of the lunar terminator.</div></div>","PeriodicalId":10340,"journal":{"name":"Chinese Journal of Physics","volume":null,"pages":null},"PeriodicalIF":4.6,"publicationDate":"2024-09-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142417817","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"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":"Computational investigations of nanofluid blood flow in stenosed artery with effects of inflammation and viscous dissipation via finite element method","authors":"Muhammad Salim Khan ,&nbsp;Shafee Ahmd ,&nbsp;Zahir Shah ,&nbsp;Mansoor H. Alshehri ,&nbsp;Elisabeta Antonescu","doi":"10.1016/j.cjph.2024.09.013","DOIUrl":"10.1016/j.cjph.2024.09.013","url":null,"abstract":"<div><div>In this study, we investigate the problem of blood flow through an artery with stenosis, focusing on the effects of inflammation. The flow profile is assumed to be parabolic, and both inflamed and non-inflamed states of stenosis are considered. The governing dimensionless equations are solved using the finite element method. Flow structures and temperature distributions are illustrated using streamlines and isothermal lines. The local Nusselt number is analyzed to understand its significance. The primary objective of this research is to analyze the behavior of nanofluid in blood flow and the associated heat transfer characteristics within an artery, both in the presence and absence of inflamed stenosis. This analysis will take into account the effects of inflammation and viscous dissipation. The finding reveals that the highest temperature gradient is obtained at the stenosis peak. The Re affects the velocity field and increases the kinetic energy. Results show that flow symmetry breaks when stenosis positions are changed. It is found that the Nusselt number is the increasing function of nanoparticle concentration, stenosis peak, viscous dissipation, and Reynolds number.</div></div>","PeriodicalId":10340,"journal":{"name":"Chinese Journal of Physics","volume":null,"pages":null},"PeriodicalIF":4.6,"publicationDate":"2024-09-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142417847","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"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":"Effect of laser chirping on third harmonic generation in anharmonic clusters with ripple on cluster density","authors":"Shivani Vij ,&nbsp;Arvinder Singh","doi":"10.1016/j.cjph.2024.09.005","DOIUrl":"10.1016/j.cjph.2024.09.005","url":null,"abstract":"<div><p>A proposed model delves into the resonant enhancement of third harmonic generation (THG) by a short-pulse laser inside nanoclustered plasma under the influence of density ripple. An intense chirped laser pulse incident on a clustered plasma of argon gas displaces the electrons of the medium and produces a restoring force. This force is considered to vary nonlinearly with electron displacement, leading to the anharmonic response of the electron clouds of the cluster. The nonlinear current at the third harmonic frequency arises from the perturbation of the electron density of the cluster by the ponderomotive force exerted on them by the incident laser pulse. Applying ripple in cluster density and electron density of surrounding plasma enables the phase-matching criteria for THG to be satisfied, which leads to enhanced harmonic output. An anharmonic structure of clusters exhibits strong optical nonlinearities, resulting in the plasmon resonance broadening and producing harmonics with greater efficiency. Numerical analysis shows that the chirp parameter of the laser pulse and ripple on cluster density enhance system nonlinearity causing the generation of a third harmonic of enhanced amplitude. The study explores how different factors such as laser intensity, cluster size, ripple parameter, chirp parameter, and electron excursion influence the efficiency of THG.</p></div>","PeriodicalId":10340,"journal":{"name":"Chinese Journal of Physics","volume":null,"pages":null},"PeriodicalIF":4.6,"publicationDate":"2024-09-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142241962","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"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":"Frequency chimera state induced by time delays in FitzHugh-Nagumo neural networks","authors":"ShouFang Huang,&nbsp;ChengYu Yu,&nbsp;ZhengGang Cai,&nbsp;JiQian Zhang,&nbsp;MaoSheng Wang,&nbsp;Fei Xu","doi":"10.1016/j.cjph.2024.09.009","DOIUrl":"10.1016/j.cjph.2024.09.009","url":null,"abstract":"<div><p>The delay of information transmission is an inherent factor of the nervous systems, which has great influences on their collective dynamic behaviors. In this paper, we constructed a ring neural network using FitzHugh-Nagumo (FHN) neuron model as the network node and memristive synapses as the connection mode. Our primary focus was on investigating the effects of time delay and coupling strength on the firing frequency of neurons. Simulation results revealed that the frequency chimera state could be induced in the neural network with appropriate time delay, which is a new type of chimera state characterized by firing frequency rather than traditional membrane potential. By adjusting the time delay properly, the neural network can also display multi-cluster frequency chimera states that coexisted with various incoherent regions and coherent regions. Meanwhile, we exhibit that initial value and coupling strength could have great influences on the effects of time delay on inducing frequency chimera state of the nervous systems.</p></div>","PeriodicalId":10340,"journal":{"name":"Chinese Journal of Physics","volume":null,"pages":null},"PeriodicalIF":4.6,"publicationDate":"2024-09-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142241516","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"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":"Fractional relaxation model with general memory effects and stability analysis","authors":"Feng-Xia Zheng ,&nbsp;Chuan-Yun Gu","doi":"10.1016/j.cjph.2024.09.006","DOIUrl":"10.1016/j.cjph.2024.09.006","url":null,"abstract":"<div><p>Voigt and Maxwell models are popularly used to model viscoelastic materials’ property. They are often presented in form of fractional relaxation equations. In order to describe rich viscoelasticity, a general Caputo derivative is introduced in fractional modeling. Then this work studies attractivity and asymptotic stability of the Caputo fractional relaxation equation with general memory effects. Firstly, the considered problem is transformed into an integral equation. A mapping and an attractive set are constructed. Furthermore, the existence of fixed points on the attractive set are investigated by using fixed point theorems. Finally, the effectiveness and convenience of the stability theory are verified through two numerical examples.</p></div>","PeriodicalId":10340,"journal":{"name":"Chinese Journal of Physics","volume":null,"pages":null},"PeriodicalIF":4.6,"publicationDate":"2024-09-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142168505","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"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":"Generalization and analytic exploration of soliton solutions for nonlinear evolution equations via a novel symbolic approach in fluids and nonlinear sciences","authors":"Brij Mohan ,&nbsp;Sachin Kumar","doi":"10.1016/j.cjph.2024.09.004","DOIUrl":"10.1016/j.cjph.2024.09.004","url":null,"abstract":"<div><p>In this work, we analyze the new generalized soliton solutions for the nonlinear partial differential equations with a novel symbolic bilinear technique. The proposed approach constructs the soliton solutions depending on the arbitrary parameters, which generalizes the soliton solutions with these additional parameters. Examining phase shifts and their dependence on the parameters influences how solitons collide, merge, or pass through each other, which is essential for the nonlinear analysis of solitons. Using the proposed technique, we examine the well-known (1＋1)-dimensional Korteweg–de Vries (KdV) and (2＋1)-dimensional Kadomtsev–Petviashvili (KP) equations with a comparative analysis of soliton solutions in the Hirota technique. We construct the generalized solitons solutions for both examined equations up to the third order, providing a better understanding of formed solitons with arbitrary parameter choices. The Cole-Hopf transformations are used to construct the bilinear form in the auxiliary function using Hirota’s <span><math><mi>D</mi></math></span>-operators for both investigated KdV and KP equations It discusses the phase shift depending on parameters and compares it to the phase shift in Hirota’s soliton solutions. We utilize <em>Mathematica</em>, a computer algebra system, to obtain the generalized solitons and analyze the dynamic behavior of the obtained solutions by finding the values for the parameters and the relationships among them. Solitons are localized waves that appear in different fields of nonlinear sciences, such as oceanography, plasmas, fluid mechanics, water engineering, optical fibers, and other sciences.</p></div>","PeriodicalId":10340,"journal":{"name":"Chinese Journal of Physics","volume":null,"pages":null},"PeriodicalIF":4.6,"publicationDate":"2024-09-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142168504","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"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":"Thickness-dependent magnetotransport and ultrafast dynamic properties of epitaxial Bi2Se3/InP(111) thin films grown using pulsed laser deposition","authors":"Phuoc Huu Le ,&nbsp;Le Thi Cam Tuyen ,&nbsp;Nguyen Nhat Quyen ,&nbsp;Sheng-Rui Jian ,&nbsp;Jyh-Wei Lee ,&nbsp;Chih-Wei Luo ,&nbsp;Jenh-Yih Juang ,&nbsp;Jiunn-Yuan Lin","doi":"10.1016/j.cjph.2024.08.030","DOIUrl":"10.1016/j.cjph.2024.08.030","url":null,"abstract":"<div><p>Bi₂Se₃ thin films with various thicknesses of 44, 94, 190 QL (1 QL = 0.955 nm) were epitaxially grown on InP (111) substrates using a Bi₂Se₈ target and pulsed laser deposition. All the Bi₂Se₃ thin films exhibited highly <em>c</em>-axis preferred orientation and well in-plane orientation with six-fold symmetric diffraction patterns of Bi₂Se₃{015} facets. The films had a clean and smooth surface with triangular step-and-terrace pyramid features and a small average roughness <em>R_a</em> ≤ 1.47 nm. The hardness and Young's modulus of a 190 QL-thick epitaxial Bi₂Se₃ film were found to be 2.1 ± 0.1 GPa and 58.6 ± 4.1 GPa, respectively. The Bi₂Se₃ thin films exhibited the typical two-dimensional weak antilocalization magnetoresistance (2D WAL MR) in a low magnetic field regime (<em>B</em> ± 0.5T). Meanwhile, they presented a parabola-like MR behavior for 190-QL-thick film, and linear MR for the thinner films at a high <em>B</em> field regime (<em>B</em> ≥ 3 T). The MR results suggest the presence of 2D topological surface states together with a dominant bulk state in the Bi₂Se₃ films. Furthermore, we observed two gigahertz acoustic phonon modes at 24.04 ± 2.05 GHz and 48.11 ± 2.02 GHz in the Bi₂Se₃ films induced by ultrafast laser pulses.</p></div>","PeriodicalId":10340,"journal":{"name":"Chinese Journal of Physics","volume":null,"pages":null},"PeriodicalIF":4.6,"publicationDate":"2024-09-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142136528","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"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":"Phase structure of quantum corrected charged AdS black hole surrounded by perfect fluid dark matter","authors":"Qi-Quan Li,&nbsp;Yu Zhang,&nbsp;Qi Sun,&nbsp;Chen-Hao Xie,&nbsp;Yu-Li Lou","doi":"10.1016/j.cjph.2024.09.001","DOIUrl":"10.1016/j.cjph.2024.09.001","url":null,"abstract":"<div><p>We derive a solution of a quantum corrected charged AdS black hole surrounded by perfect fluid dark matter (PFDM). The thermodynamic quantities and the modified first law of thermodynamics are obtained by considering the black hole mass as chemical enthalpy rather than energy. A first order phase transition (small to large black holes) is recognized from the swallowtail in the Gibbs free energy <span><math><mi>G</mi></math></span> versus Hawking temperature <span><math><msub><mrow><mi>T</mi></mrow><mrow><mi>H</mi></mrow></msub></math></span> graph. The black hole exhibits the characteristic “standard liquid/gas behavior” of van der Waals fluids on the <span><math><mrow><mi>P</mi><mo>−</mo><mi>V</mi></mrow></math></span> graph. By further studying the heat capacity of the black hole, we identify a second order phase transition at the event horizons <span><math><msub><mrow><mi>x</mi></mrow><mrow><mn>1</mn></mrow></msub></math></span> and <span><math><msub><mrow><mi>x</mi></mrow><mrow><mn>2</mn></mrow></msub></math></span>, respectively. Thus, we demonstrate that a quantum corrected charged AdS black hole surrounded by PFDM can be studied for its thermodynamic stability and phase transition from the perspective of black hole chemistry.</p></div>","PeriodicalId":10340,"journal":{"name":"Chinese Journal of Physics","volume":null,"pages":null},"PeriodicalIF":4.6,"publicationDate":"2024-09-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142168393","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"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":"Molecular dynamics investigation on the mechanical properties of a novel 2D carbon allotrope: Planar net-τ nanoribbon","authors":"Xiaowei Zhang ,&nbsp;Shupeng Liu ,&nbsp;Pengtao Li","doi":"10.1016/j.cjph.2024.08.038","DOIUrl":"10.1016/j.cjph.2024.08.038","url":null,"abstract":"<div><div>This study is focused on investigating of the mechanical properties of a recently discovered two-dimensional carbon allotrope, known as planar net-τ, through molecular dynamics simulations. The planar net-τ is a unique and unexplored carbon configuration known for its intricate network of carbon atoms arranged in a planar lattice. The study aims to improve understanding of the mechanical properties of planar net-τ. This includes investigating parameters such as Young's modulus, fracture strain, ultimate strength, strain at ultimate stress, and the stress-strain curve. This study achieves this by deliberately manipulating of variables, such as introduction of vacancy defects, altering temperature, and dimensional adjustments. Vacancy defects in 2D carbon allotropes significantly impair their mechanical properties, reducing stiffness and increasing mechanical failure. Changes in dimensions further impact these properties through contraction, affecting strength and elasticity. These results highlight the anisotropic nature of these structures.</div></div>","PeriodicalId":10340,"journal":{"name":"Chinese Journal of Physics","volume":null,"pages":null},"PeriodicalIF":4.6,"publicationDate":"2024-09-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142417849","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"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":"Nanoscale photoemission in a plasmon focusing lens with a nanohole explored by time-of-flight photoemission electron microscopy","authors":"Guiqi Wang ,&nbsp;Boyu Ji ,&nbsp;Yang Xu ,&nbsp;Jingquan Lin","doi":"10.1016/j.cjph.2024.08.044","DOIUrl":"10.1016/j.cjph.2024.08.044","url":null,"abstract":"<div><p>Propagating surface plasmon polaritons (SPPs) provide an important platform for the design of various photoelectric devices such as nanometer-scale ultrafast electron sources. Here, a high-brightness nanoscale photoelectron source in a plasmon focusing lens with a nanohole is investigated using time-of-flight photoemission electron microscopy (TOF-PEEM). By exploiting the high spatial resolution of TOF-PEEM, it is found that the photoemission was localized at the nanoscale in both x and y directions. In addition, a large multiphoton photoemission enhancement was achieved and a strong-field effect was observed due to the interplay between the SPP and the nanohole. This paper provides a new idea for the development of the high-brightness nanoscale photoelectron sources and a deep understanding of the interplay between SPP and LSP.</p></div>","PeriodicalId":10340,"journal":{"name":"Chinese Journal of Physics","volume":null,"pages":null},"PeriodicalIF":4.6,"publicationDate":"2024-09-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142229218","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"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}