Chinese Journal of Physics最新文献

{"title":"The structural, electronic and magnetic properties of Fe3ZnC anti-perovskite","authors":"M. Hajjami ,&nbsp;A. Oubelkacem ,&nbsp;Y. Benhouria ,&nbsp;M. Kibbou ,&nbsp;I. Essaoudi ,&nbsp;A. Ainane","doi":"10.1016/j.cjph.2024.08.007","DOIUrl":"10.1016/j.cjph.2024.08.007","url":null,"abstract":"<div><p>A comprehensive exploration of the structural, electronic, and magnetic attributes of anti-perovskite Fe3ZnC carbides was carried out using Density Functional Theory (DFT) and Monte Carlo Simulation (MCS). These anti-perovskite materials possess a unique structure where cation and anion positions are interchanged within the perovskite framework. Our study involves a comparative analysis of the electronic band structures and density of states (DOS) for Fe3ZnC, considering prior theoretical and experimental research. Understanding these anti-perovskite materials' band structures and DOS is pivotal for their effective utilization in magnetic sensors and magnetic refrigeration applications. Our results indicate that Fe3ZnC displays ferromagnetic metallic behavior, particularly when applying the Generalized Gradient Approximation (GGA). Notably, there is a significant overlap between the valence (VB) and conduction (CB) bands. Furthermore, MCS predicts a second-order ferromagnetic-to-paramagnetic transition in the anti-perovskite Fe3ZnC compound, characterized by a notably high Curie temperature. These insights advance our understanding of these materials, paving the way for their effective utilization in magnetic technologies.</p></div>","PeriodicalId":10340,"journal":{"name":"Chinese Journal of Physics","volume":null,"pages":null},"PeriodicalIF":4.6,"publicationDate":"2024-08-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141993846","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":"Existence of static wormhole solutions in f(R,A) gravity","authors":"Adnan Malik ,&nbsp;Amjad Hussain ,&nbsp;Mushtaq Ahmad ,&nbsp;M. Farasat Shamir","doi":"10.1016/j.cjph.2024.08.005","DOIUrl":"10.1016/j.cjph.2024.08.005","url":null,"abstract":"<div><p>This study explores wormhole solutions by analyzing energy conditions within the framework of <span><math><mrow><mi>f</mi><mrow><mo>(</mo><mi>R</mi><mo>,</mo><mi>A</mi><mo>)</mo></mrow></mrow></math></span> modified theory of gravity, which is derived from the inverse of the Ricci tensor. For this purpose, we consider a linear model, defined as <span><math><mrow><mi>f</mi><mrow><mo>(</mo><mi>R</mi><mo>,</mo><mi>A</mi><mo>)</mo></mrow><mo>=</mo><mi>R</mi><mo>+</mo><mi>α</mi><mi>A</mi></mrow></math></span>, where <span><math><mi>R</mi></math></span> denotes the Ricci scalar, <span><math><mi>α</mi></math></span> is the coupling parameter, and <span><math><mi>A</mi></math></span> represents the anticurvature scalar. We further introduce a specific form of shape function to examine the characteristics of energy conditions for the distribution of anisotropic matter. Moreover, we examine the behavior of shape function and energy conditions for both isotropic and barotropic matter content as well. Through the selection of suitable parameter values, it has been shown that energy conditions are breached in some specified regions, indicating the existence of exotic matter. The thorough analysis confirms the presence of wormhole geometries in <span><math><mrow><mi>f</mi><mrow><mo>(</mo><mi>R</mi><mo>,</mo><mi>A</mi><mo>)</mo></mrow></mrow></math></span> gravity.</p></div>","PeriodicalId":10340,"journal":{"name":"Chinese Journal of Physics","volume":null,"pages":null},"PeriodicalIF":4.6,"publicationDate":"2024-08-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.sciencedirect.com/science/article/pii/S057790732400306X/pdfft?md5=03daa9e72d41d77d57163d5771f51ccd&pid=1-s2.0-S057790732400306X-main.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141993847","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":"Valence-mirror symmetry in the first g9/2 subshell for semi-magic nuclei","authors":"Lei Liu","doi":"10.1016/j.cjph.2024.08.004","DOIUrl":"10.1016/j.cjph.2024.08.004","url":null,"abstract":"<div><p>The <span><math><msubsup><mrow></mrow><mrow><mn>28</mn></mrow><mrow><mn>70</mn></mrow></msubsup></math></span>Ni₄₂/<span><math><msubsup><mrow></mrow><mrow><mn>42</mn></mrow><mrow><mn>92</mn></mrow></msubsup></math></span>Mo₅₀, <span><math><msubsup><mrow></mrow><mrow><mn>28</mn></mrow><mrow><mn>72</mn></mrow></msubsup></math></span>Ni₄₄/<span><math><msubsup><mrow></mrow><mrow><mn>44</mn></mrow><mrow><mn>94</mn></mrow></msubsup></math></span>Ru₅₀, <span><math><msubsup><mrow></mrow><mrow><mn>28</mn></mrow><mrow><mn>74</mn></mrow></msubsup></math></span>Ni₄₆/<span><math><msubsup><mrow></mrow><mrow><mn>46</mn></mrow><mrow><mn>96</mn></mrow></msubsup></math></span>Pd₅₀ and <span><math><msubsup><mrow></mrow><mrow><mn>28</mn></mrow><mrow><mn>76</mn></mrow></msubsup></math></span>Ni₄₈/<span><math><msubsup><mrow></mrow><mrow><mn>48</mn></mrow><mrow><mn>98</mn></mrow></msubsup></math></span>Cd₅₀ valence-mirror pairs have been studied using valence-mirror energy differences for the first time. Valence-mirror symmetry is discussed based on a systematic analysis of the valence-mirror energy differences and supported by shell-model calculations. Mass scaling of the energy spacings in ⁷⁴Ni/⁹⁶Pd/¹²⁸Pd and ⁷⁶Ni/⁹⁸Cd/¹³⁰Cd has been investigated, focusing on the <span><math><mrow><msup><mrow><mn>8</mn></mrow><mrow><mo>+</mo></mrow></msup><mo>−</mo><msup><mrow><mn>0</mn></mrow><mrow><mo>+</mo></mrow></msup></mrow></math></span> and <span><math><mrow><msup><mrow><mn>8</mn></mrow><mrow><mo>+</mo></mrow></msup><mo>−</mo><msup><mrow><mn>2</mn></mrow><mrow><mo>+</mo></mrow></msup></mrow></math></span> spacings. In particular, simple schematic shell-model calculations using a <span><math><mi>δ</mi></math></span> interaction have been performed for ⁷⁶Ni and ¹³⁰Cd to study the structural evolution with increasing spin.</p></div>","PeriodicalId":10340,"journal":{"name":"Chinese Journal of Physics","volume":null,"pages":null},"PeriodicalIF":4.6,"publicationDate":"2024-08-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141993848","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":"A fractional-order two-strain SVIR model with stability analysis","authors":"Weiyi Xu ,&nbsp;Hu Wang ,&nbsp;Zhenzhen Lu ,&nbsp;Guojian Ren ,&nbsp;Yongguang Yu","doi":"10.1016/j.cjph.2024.08.006","DOIUrl":"10.1016/j.cjph.2024.08.006","url":null,"abstract":"<div><p>The outbreak and spread of infectious diseases has become a worldwide concern, and during the spread of infectious diseases, viruses have been found to evolve and diverge into different strains. Based on this phenomenon, the mathematical and biological properties of a multi-strain infectious disease model with vaccination have been studied. In this paper, a fractional-order two-strain SVIR model is proposed. Specifically, the model incorporates vaccine protection that follows a power-law tail distribution and where the vaccine affects the two-strain differently. And the fractional-order derivative form is given by derivation because its memory properties can better characterize the effect of vaccine protection. Meanwhile, we derive an explicit expression for the basic reproduction number of the two-strain and clarify its crucial role in governing the dynamics of the system. The stability results for the fractional-order model are given with the help of Routh–Hurwitz and Lyapunov methods. Moreover, it has been found that the spread of the two-strain of the infectious disease has different effects under different thresholds. Finally, the spread of COVID-19 in India is considered as a real case study to verify the rationality of the proposed model.</p></div>","PeriodicalId":10340,"journal":{"name":"Chinese Journal of Physics","volume":null,"pages":null},"PeriodicalIF":4.6,"publicationDate":"2024-08-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142040060","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":"Invariant analysis, invariant subspace method and conservation laws of the (2+1)-dimensional mixed fractional Broer–Kaup–Kupershmidt system","authors":"Qiongya Gu,&nbsp;Lizhen Wang","doi":"10.1016/j.cjph.2024.08.001","DOIUrl":"10.1016/j.cjph.2024.08.001","url":null,"abstract":"<div><p>In this paper, we investigate the (2+1)-dimensional mixed fractional Broer–Kaup–Kupershmidt system (MFBKKS) with Riemann–Liouville time fractional derivative and integer order y-derivative. This system models dispersive and nonlinear long gravity waves propagating in shallow water in two horizontal directions with time memories. Lie symmetry analysis and invariant subspace method are distinctly employed to construct the exact solutions to the MFBKKS. Initially, the Lie algebras admitted by MFBKKS are obtained with the help of Lie symmetry analysis. Then, we establish the commutative table, adjoint relations and adjoint transformation matrix. Specifically, the one-dimensional optimal system is established correspondingly, and symmetry reduction is performed. In particular, (2+1)-dimensional MFBKKS is reduced to (1+1)-dimensional mixed fractional system using Erdélyi–Kober fractional differential operator. Further, the power series solution of MFBKKS is constructed via power series method. By applying invariant subspace method, we obtain more exact solutions of MFBKKS. In addition, the conservation laws are derived by new Noether theorem. Finally, the three-dimensional diagrams of some obtained solutions are demonstrated utilizing Matlab for visualization, and some of the calculations were verified using computational packages Maple for symbolic computation.</p></div>","PeriodicalId":10340,"journal":{"name":"Chinese Journal of Physics","volume":null,"pages":null},"PeriodicalIF":4.6,"publicationDate":"2024-08-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142150213","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":"Excitation control of bright-bright vector ghost waves with ring structures in an inhomogeneous partially nonlocal nonlinear medium","authors":"Li Chen,&nbsp;Su-Guang Shi","doi":"10.1016/j.cjph.2024.08.003","DOIUrl":"10.1016/j.cjph.2024.08.003","url":null,"abstract":"<div><p>The similar structures of coupled solitons for two-component systems were extensively discussed in literature. In this paper, the excitation management of different two-component structures for bright-bright vector ghost waves with ring structures of the inhomogeneous partially nonlocal nonlinear Schrödinger vector models under a parabolic potential is paid close attention. Considering the comparison between the maximum value of the accumulated time and the excited value of bright-bright ghost waves, the inhibition and maintenance of excitations for bright-bright ghost waves with ring structures are studied in the exponential system with the periodic modulation, and the periodical completion and periodical inhibition of excitations for bright-bright ghost waves with ring structures are discussed in the periodic modulation system. Moreover, the effect of different values of two transverse diffractions, and ring radius and thickness parameters on bright-bright ghost waves with ring structures is investigated. This study generalizes the excitation management of vector ghost waves into the partially nonlocal properties of nonlinear waves.</p></div>","PeriodicalId":10340,"journal":{"name":"Chinese Journal of Physics","volume":null,"pages":null},"PeriodicalIF":4.6,"publicationDate":"2024-08-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141998471","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":"Rheological analysis of magnetized trihybrid nanofluid drug carriers in unsteady blood flow through a single-stenotic artery","authors":"Tahir Zaman ,&nbsp;Zahir Shah ,&nbsp;Muhammad Rooman ,&nbsp;Waris Khan ,&nbsp;Mansoor H. Alshehri ,&nbsp;Narcisa Vrinceanu","doi":"10.1016/j.cjph.2024.08.002","DOIUrl":"10.1016/j.cjph.2024.08.002","url":null,"abstract":"<div><p>In this work, we use the Casson fluid model to analyze the blood flow through a cylindrical stenosis artery. Blood is utilized as a base fluid and aluminium oxide (<span><math><mrow><mi>A</mi><msub><mi>l</mi><mn>2</mn></msub><msub><mi>O</mi><mn>3</mn></msub></mrow></math></span>), copper (<span><math><mrow><mi>C</mi><mi>u</mi></mrow></math></span>), and titanium oxide (<span><math><mrow><mi>T</mi><mi>i</mi><msub><mi>O</mi><mn>2</mn></msub></mrow></math></span>) of cylindrical shapes are used as nanoparticles (NPs), which bind to blood to form <span><math><mrow><mi>T</mi><mi>i</mi><msub><mi>O</mi><mn>2</mn></msub><mo>−</mo><mi>C</mi><mi>u</mi><mo>−</mo><mi>A</mi><msub><mi>l</mi><mn>2</mn></msub><msub><mi>O</mi><mn>3</mn></msub><mo>/</mo></mrow></math></span>Blood tri-hybrid nanofluid (THNF). Mathematical analysis has been conducted by considering the blood as a non-Newtonian fluid. The flow is subjected to an external magnetic field that is applied in the radial direction while considering the arterial vessels with a wall permeability effect. For the solution of nonlinear resultant equations, the homotopy analysis method (HAM) is utilized. The present model has been validated by comparing the results of our proposed model with existing work. Key factors like velocity, flow rate, temperature, and wall shear stress are calculated at a precise height of the stenosis. It is noted that the Casson fluid parameter improves the temperature profile. Additionally, it has been noted that tri-hybrid nanofluids have a higher thermal conductivity than hybrid nanofluids (HNFs). Implanting the tri-hybrid nanoparticles (Cu, Al₂O₃ and TiO₂) in the blood leads to promote its axial velocity. When the outer magnetic field is functional in the direction radial to flow of the blood, the velocity profile experiences a substantial decrease, while temperature and concentration profiles are rather less changed. The applications of these simulations include the diffusion of nanodrugs and the magnetic targeted treatment of stenosed artery diseases.</p></div>","PeriodicalId":10340,"journal":{"name":"Chinese Journal of Physics","volume":null,"pages":null},"PeriodicalIF":4.6,"publicationDate":"2024-08-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141991061","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":"Dynamics of memristor coupled discrete fractional symmetric neural network model","authors":"Shaobo He ,&nbsp;D. Vignesh ,&nbsp;Santo Banerjee","doi":"10.1016/j.cjph.2024.07.043","DOIUrl":"10.1016/j.cjph.2024.07.043","url":null,"abstract":"<div><p>Neural networks, also known as artificial neural networks (ANNs), represent innovative computational models inspired by the functioning of biological neurons in the human body. Currently, neural network models are employed to address intricate real-world challenges. This article focuses on constructing and dynamically analyzing interconnected symmetric neural network models inspired by the Hopfield type. These models incorporate discrete fractional memristor elements featuring quadratic memductance. The primary objective is to comprehend system characteristics by introducing nonlinearity to the inter-neuron weights in a functional manner. Additionally, the study explores the influence of electromagnetic radiation on neurons. Bifurcation diagrams, considering fractional order and Lyapunov exponents, illustrate the chaotic nature of the interconnected neural network model. The investigation delves into coexisting system states, examining coexisting bifurcations and attractors. The article offers potential for developing bio-inspired, energy-efficient, and adaptive neural network architectures, thereby contributing to advancements in artificial intelligence and neuromorphic applications.</p></div>","PeriodicalId":10340,"journal":{"name":"Chinese Journal of Physics","volume":null,"pages":null},"PeriodicalIF":4.6,"publicationDate":"2024-08-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142048956","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":"The impact of rotation on the onset of cellular convective movement in a casson fluid saturated permeable layer with temperature dependent thermal conductivity and viscosity deviations","authors":"Dhananjay Yadav ,&nbsp;Mukesh Kumar Awasthi ,&nbsp;Ravi Ragoju ,&nbsp;Krishnendu Bhattacharyya ,&nbsp;Raghunath Kodi ,&nbsp;Junye Wang","doi":"10.1016/j.cjph.2024.07.020","DOIUrl":"10.1016/j.cjph.2024.07.020","url":null,"abstract":"<div><p>In this effort, we examined the impact of rotation on the arrival of cellular convective motion in a Casson fluid saturated permeable layer with temperature dependent thermal conductivity and viscosity deviations. The problem is important to cellular foams prepared from plastics, ceramics, and metallic where radiation conductivity is revealed as a power function of temperature. The altered Darcy model is used to characterize the rheological performance of Casson fluid flow in permeable medium. The approximate analytical solution and numerical solution correct to one decimal place are presented utilizing the Galerkin method. The analysis reveals that the influence of thermal conductivity disparity parameter and the rotation is to delay the convective motion whereas; the viscosity disparity parameter and the Casson parameter have dual impact on the convective motion in the presence of rotation. The range of the convective cell drops with increasing the thermal conductivity disparity parameter, the viscosity disparity parameter, the Casson parameter and rotation parameter. In the absence of rotation, the range of the convective cell does not depend on the Casson parameter and the viscosity disparity parameter. Further, the existing results are compared with the existing literature under the particular case of this study.</p></div>","PeriodicalId":10340,"journal":{"name":"Chinese Journal of Physics","volume":null,"pages":null},"PeriodicalIF":4.6,"publicationDate":"2024-08-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141962166","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":"Accretion mechanism for regular black holes with asymptotically Minkowski Cores and improved Schwarzschild black holes","authors":"G. Murtaza ,&nbsp;A. Ditta ,&nbsp;A. Ghaffar ,&nbsp;G. Mustafa ,&nbsp;S.K. Maurya ,&nbsp;Farruh Atamurotov","doi":"10.1016/j.cjph.2024.07.042","DOIUrl":"10.1016/j.cjph.2024.07.042","url":null,"abstract":"<div><p>In this paper, we investigate the fascinating implications of the accretion process for two different kinds of black holes. A detailed analysis of the moving fluid in this accretion process is provided. The radial velocity <span><math><mrow><mi>u</mi><mrow><mo>(</mo><mi>r</mi><mo>)</mo></mrow></mrow></math></span>, the energy density <span><math><mrow><mi>ρ</mi><mrow><mo>(</mo><mi>r</mi><mo>)</mo></mrow></mrow></math></span>, speed of sound <span><math><msub><mrow><msup><mrow><mi>a</mi></mrow><mrow><mn>2</mn></mrow></msup></mrow><mrow><mi>s</mi></mrow></msub></math></span> and the mass accretion rate <span><math><mover><mrow><mi>M</mi></mrow><mrow><mo>̇</mo></mrow></mover></math></span> of the regular black holes and improved Schwarzschild black hole are explored. Interestingly, we consider the most generic black hole space–times with isotropic fluid for this accretion process. The required and necessary physical behaviors around the black holes, such as the radial velocity, the energy density of the moving fluid within the scope of dust, stiff fluid and quintessence, are achieved. Our findings suggest that critical parameters like <span><math><mi>l</mi></math></span> in regular black holes, <span><math><mi>Γ</mi></math></span> in improved Schwarzschild black holes and the state parameter <span><math><mi>k</mi></math></span> are responsible for the accretion mechanism.</p></div>","PeriodicalId":10340,"journal":{"name":"Chinese Journal of Physics","volume":null,"pages":null},"PeriodicalIF":4.6,"publicationDate":"2024-07-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142011177","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}