Chinese Journal of Physics最新文献

{"title":"Magnetic properties of a hexagonal Ising nanowire with spin-1/2 core and spin-5/2 shell","authors":"I.A. Badrour,&nbsp;H. Saadi,&nbsp;N. Hachem,&nbsp;M. El Bouziani","doi":"10.1016/j.cjph.2025.06.042","DOIUrl":"10.1016/j.cjph.2025.06.042","url":null,"abstract":"<div><div>Using a mean-field approach, we investigated the magnetic characteristics and phase diagrams of a hexagonal Ising nanowire with a spin-1/2 core and a spin-5/2 shell in a ferrimagnetic configuration. We examined the impacts of crystal field and exchange interactions on the critical and magnetic behaviors of the nanowire. The results reveal the emergence of first- and second-order phase transitions, critical isolated end-points, and compensation temperatures. The properties identified could be fascinating for the technological uses of these nanowires.</div></div>","PeriodicalId":10340,"journal":{"name":"Chinese Journal of Physics","volume":"96 ","pages":"Pages 1410-1419"},"PeriodicalIF":4.6,"publicationDate":"2025-07-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144632011","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":"Local error estimate of L1 scheme for time-fractional convection–diffusion–reaction equation on a star-shaped pipe network","authors":"Jingjia Wang,&nbsp;Xiangyun Meng,&nbsp;Yongguang Yu","doi":"10.1016/j.cjph.2025.06.040","DOIUrl":"10.1016/j.cjph.2025.06.040","url":null,"abstract":"<div><div>It is a significant issue to study the discrete method for the time-fractional parabolic problem on the metric graph in scientific computation. In this paper, the time-fractional convection–diffusion–reaction problem with initial singularity on the metric star-shaped graph is considered. In order to overcome the weak singularity of the solution numerically, a L1-finite difference method over the metric graph is constructed by using the graded temporal mesh and uniform spacial mesh. More specific, L1 scheme is employed for temporal discretization of the Caputo fractional-derivative. Also, the finite difference method is proposed for spacial discretization by applying the technique of ghost points to discretize the Robin–Kirchhoff condition at the intersection point and the boundary conditions. Through this method, the second-order truncation accuracy in space is obtained. Over the entire star graph, a sharp error estimate of this full-discrete scheme at each time level is demonstrated. Meanwhile, the convergence analysis for a preserving Robin–Kirchhoff condition scheme at each time step is given. Numerical results are presented to confirm the sharpness of the theoretical analysis.</div></div>","PeriodicalId":10340,"journal":{"name":"Chinese Journal of Physics","volume":"97 ","pages":"Pages 44-66"},"PeriodicalIF":4.6,"publicationDate":"2025-07-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144654368","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":"Optimized oracle and diffusion operator implementations for enhanced quantum search performance","authors":"Tarun Kumar ,&nbsp;Dilip Kumar ,&nbsp;Gurmohan Singh","doi":"10.1016/j.cjph.2025.07.014","DOIUrl":"10.1016/j.cjph.2025.07.014","url":null,"abstract":"<div><div>Searching for an item in an unstructured database with Grover's search algorithm (<em>GSA</em>) guarantees a quadratic improvement in speed compared to classical approaches. One of the challenges in implementing <em>GSA</em> is the need for a large number of gates, which can be resource-intensive and error-prone. This paper presents a novel optimization of <em>GSA</em> that minimizes the complexity by reducing the gate count and circuit depth of the oracle and diffusion operator. A 47 % and 49 % reduction in gate count and circuit depth is observed for the 3-, 4-, and 5-qubit implementations of the optimized <em>GSA</em> against the standard version. Furthermore, the optimized <em>GSA</em> is utilized to perform a search in a quantum database for the index of <span><math><mrow><mo>|</mo><mn>111</mn><mo>〉</mo></mrow></math></span>. The results also indicate a significant improvement in the accuracy and execution time for the 3-, 4-, and 5-qubit implementations, and for searching a quantum database with the optimized <em>GSA</em> against the standard <em>GSA</em>.</div></div>","PeriodicalId":10340,"journal":{"name":"Chinese Journal of Physics","volume":"97 ","pages":"Pages 920-932"},"PeriodicalIF":4.6,"publicationDate":"2025-07-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144829514","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":"Thermal analysis and entropy generation on time-dependent two-phase immiscible non-Newtonian nanofluids through porous tube under electromagnetic effects with slip velocity","authors":"Sangeetha J. ,&nbsp;Ponalagusamy R.","doi":"10.1016/j.cjph.2025.06.015","DOIUrl":"10.1016/j.cjph.2025.06.015","url":null,"abstract":"<div><div>The present research scrutinized the numerical simulations on the thermal effects of multiphase flow of immiscible Sutterby-Jeffrey nanofluids in a circular cylinder along with slip velocity through the porous region. The influence of Palladium (<span><math><mrow><mi>P</mi><mi>d</mi></mrow></math></span>) nanoparticles with distinct shapes was studied, proceeding with hexahedron (<span><math><mrow><msub><mrow><mi>n</mi></mrow><mrow><mn>2</mn></mrow></msub><mo>=</mo><mn>3</mn><mo>.</mo><mn>72</mn></mrow></math></span>) shape. The conduit is maintained to be isothermal and the governing equations are constructed for the continuity, momentum, energy and entropy equations along with continuity in the interfacial regions. The different combinations of base fluids Ethylene Glycol and mineral oil are explained and it is certainly proven that Ethylene Glycol performs better than Mineral oil. The dimensionless equations governing each layer were numerically integrated using the finite difference method with the Crank–Nicolson approach. A mesh independence and validation results are conducted. Furthermore, a parametric study is performed under three conditional cases involving the Sutterby parameter, Grashof number, electromagnetic field, and Prandtl number. The comparison was made between <span><math><mrow><mi>P</mi><mi>d</mi></mrow></math></span>, <span><math><mrow><mi>T</mi><mi>i</mi><msub><mrow><mi>O</mi></mrow><mrow><mn>2</mn></mrow></msub></mrow></math></span> and <span><math><mrow><mi>A</mi><mi>u</mi></mrow></math></span> nanoparticles for the velocity profile and found that the effectiveness of Pd nanofluids was much more efficient than the Au and <span><math><mrow><mi>T</mi><mi>i</mi><msub><mrow><mi>O</mi></mrow><mrow><mn>2</mn></mrow></msub></mrow></math></span> nanofluids. A binate circumstance was observed in the Bejan number under conditional cases. Meanwhile, the Sutterby parameter and Jeffrey parameter enhanced the entropy generation. In addition, the entropy in region I was less compared to Region II whereas the opposite behaviour was perceived in the velocity profiles.</div></div>","PeriodicalId":10340,"journal":{"name":"Chinese Journal of Physics","volume":"97 ","pages":"Pages 532-562"},"PeriodicalIF":4.6,"publicationDate":"2025-07-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144750085","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":"Multiphase flow of three immiscible non-Newtonian fluids through porous cylindrical annulus under magnetic field","authors":"Satish Kumar ,&nbsp;Satya Deo ,&nbsp;Pankaj Kumar Maurya ,&nbsp;Pawan Kumar Patel","doi":"10.1016/j.cjph.2025.06.047","DOIUrl":"10.1016/j.cjph.2025.06.047","url":null,"abstract":"<div><div>The present work concerns the flow of three immiscible non-Newtonian fluids: a couple stress fluid, a micropolar fluid and a Jeffery fluid through a cylindrical pipe under applied uniform magnetic field in the direction perpendicular to the flow. The Jeffery fluid flows through the deepest cavity, while the couple stress fluid and the micropolar fluid flow through the outer and middle cylindrical shells, respectively. Jeffery’s equations of motion govern the flow of Jeffery fluid, while the well-known Brinkman equation and Eringen’s field equations govern the movement of couple stress fluid and micropolar fluid, respectively. Analytical expressions for microrotational velocity, flow rate, shear and couple stresses, and velocity are obtained using appropriate boundary conditions. Graphical and detailed studies have been made on the effects of several parameters on fluid velocity, microrotational velocity, couple stress, and flow rate. These parameters include porosity, permeability, couple stress, micropolar, viscosity ratios, and electrical conductivity ratios.</div></div>","PeriodicalId":10340,"journal":{"name":"Chinese Journal of Physics","volume":"97 ","pages":"Pages 15-43"},"PeriodicalIF":4.6,"publicationDate":"2025-07-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144654367","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":"Quantum mechanical analysis of cesium dimer, titanium hydride, and titanium carbide: Vibrational spectra, expectation values, and information-theoretic measures","authors":"Etido P. Inyang ,&nbsp;N. Ali ,&nbsp;R. Endut ,&nbsp;N.R. Yusof ,&nbsp;S.A. Aljunid ,&nbsp;M.A. Romli","doi":"10.1016/j.cjph.2025.07.010","DOIUrl":"10.1016/j.cjph.2025.07.010","url":null,"abstract":"<div><div>This study explores quantum systems governed by a hybrid potential model that combines the Möbius square and screened Kratzer potentials (MSSKP). The Schrödinger Eq. was solved analytically using the parametric Nikiforov–Uvarov (pNU) method to investigate the quantum properties of heteronuclear diatomic molecules such as titanium hydride (TiH) and titanium carbide (TiC). Information-theoretic measures—namely, Shannon entropy and Fisher information—were employed to probe wavefunction delocalization and electron density localization, respectively. Expectation values were derived using the Hellmann–Feynman theorem. The results indicate that TiC exhibits stronger electron localization and covalent bonding compared to TiH. Moreover, the vibrational energy levels of the cesium dimer (Cs₂) were calculated and showed excellent agreement with experimental Rydberg–Klein–Rees (RKR) data. Comparative analysis revealed that the MSSKP outperforms the Morse and Manning–Rosen potentials, achieving a minimum mean absolute error (MAE) of 0.0234 cm⁻¹, compared to 0.2364 cm⁻¹ and 0.0517 cm⁻¹, respectively. This work underscores the synergy between quantum mechanical modeling and information theory, offering deeper insights into molecular structure, bonding, and quantum behavior relevant to quantum chemistry and nanophysics.</div></div>","PeriodicalId":10340,"journal":{"name":"Chinese Journal of Physics","volume":"97 ","pages":"Pages 471-485"},"PeriodicalIF":4.6,"publicationDate":"2025-07-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144724791","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":"Thermoacoustic streaming between parallel plates under magnetic fields","authors":"M.B. Arain ,&nbsp;S. Hussain ,&nbsp;S. Shaheen ,&nbsp;T. Saidani ,&nbsp;J. Hu","doi":"10.1016/j.cjph.2025.07.011","DOIUrl":"10.1016/j.cjph.2025.07.011","url":null,"abstract":"<div><div>Thermal Rayleigh-type acoustic streaming, the phenomenon in which fluid motion is caused by interacting with acoustic waves having temperature gradient, has been reported to have essential use in a wide range of applications including microfluidic mixing and thermal management applications. However, the combined influence of acoustic streaming and magnetic fields on heat transfer remains insufficiently explored. This research examines the influence of MHD on thermal Rayleigh-type acoustic streaming in a horizontal parallel plate configuration with the help of both analytical and numerical tools. Based on the value of<span><math><mrow><mi>P</mi><mi>e</mi><mo>≪</mo><mn>1</mn></mrow></math></span>, the use of the Perturbation method, for<span><math><mrow><mi>P</mi><mi>e</mi><mo>≫</mo><mn>1</mn></mrow></math></span>, numerical simulations are employed to solve the mathematical equations. This Computational analysis helps to know in detail about the relationship between acoustic streaming and magnetohydrodynamics with the goal of advancing thermal control strategies in aerospace actuators, microfluidic devices, and ultrasonic systems. The key findings show that the pair of equations present the central velocity as occurring within the flow region as it affirmed that in flow region or flow core, the flow does not depend on the viscosity, and the flow described in this equation is dictated by the magnetic field. For magnetic field on Couette flow has been gathered graphically and results depicted in the graphs affirm that flow has been controlled with the help of magnetic field. Asymptotic expression for <span><math><mrow><mi>P</mi><mi>e</mi><mo>≪</mo><mn>1</mn></mrow></math></span>, which denote time and axial direction averaged heat transfer coefficient, Nusselt number are also derived.</div></div>","PeriodicalId":10340,"journal":{"name":"Chinese Journal of Physics","volume":"97 ","pages":"Pages 883-896"},"PeriodicalIF":4.6,"publicationDate":"2025-07-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144809561","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":"Universality in tidal response close to maximum mass of compact star in f(R,T) gravity","authors":"Kumar Gaurav Sagar ,&nbsp;Neeraj Pant ,&nbsp;Brajesh Pandey","doi":"10.1016/j.cjph.2025.06.045","DOIUrl":"10.1016/j.cjph.2025.06.045","url":null,"abstract":"<div><div>The exceptional characteristics of PSR J0952-0607 including its near-breakup spin rate and faint X-ray counterpart, highlight major gaps in our understanding of the birth mechanisms of structurally stable pulsar in black widow systems. Thus an attempt is made here to develop a self-consistent model for the compact star in <span><math><mrow><mi>f</mi><mrow><mo>(</mo><mi>R</mi><mo>,</mo><mi>T</mi><mo>)</mo></mrow></mrow></math></span> framework under the vanishing complexity setup. The obtained field equations are then solved for an anisotropic fluid distribution, to analyze the role of <span><math><mi>α</mi></math></span> coupling in shaping the key stellar parameters. Our result emphasizes that more massive and denser core can exist in stable equilibrium within the <span><math><mrow><mi>f</mi><mrow><mo>(</mo><mi>R</mi><mo>,</mo><mi>T</mi><mo>)</mo></mrow></mrow></math></span> framework. One of the key findings of our analysis is the existence of a universality class that limits the tidal response as the compact star approaches its maximum stable mass.</div></div>","PeriodicalId":10340,"journal":{"name":"Chinese Journal of Physics","volume":"97 ","pages":"Pages 1-14"},"PeriodicalIF":4.6,"publicationDate":"2025-07-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144654366","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":"Dirac neutrino mass in a U(1)L model with T7×Z4 symmetry","authors":"V.V. Vien ,&nbsp;Mayengbam Kishan Singh","doi":"10.1016/j.cjph.2025.06.031","DOIUrl":"10.1016/j.cjph.2025.06.031","url":null,"abstract":"<div><div>We propose a <span><math><mrow><mi>U</mi><msub><mrow><mrow><mo>(</mo><mn>1</mn><mo>)</mo></mrow></mrow><mrow><mi>L</mi></mrow></msub></mrow></math></span> model with <span><math><mrow><msub><mrow><mi>T</mi></mrow><mrow><mn>7</mn></mrow></msub><mo>×</mo><msub><mrow><mi>Z</mi></mrow><mrow><mn>4</mn></mrow></msub></mrow></math></span> symmetry for generating Dirac neutrino mass matrix texture. The Dirac neutrino mass matrix hints for a realistic lepton mixing pattern where the explicit relations between the Yukawa-like couplings and the observed neutrino oscillation parameters are established. The Yukawa-like couplings in the charged-lepton sector are expressed in terms of three charged lepton masses while the Yukawa-like couplings in the neutrino sector are expressed in terms of neutrino oscillation parameters. The considered model is satisfied for both normal and inverted neutrino mass hierarchies and for both lower and higher octants in the light of the recent experimental data.</div></div>","PeriodicalId":10340,"journal":{"name":"Chinese Journal of Physics","volume":"97 ","pages":"Pages 239-246"},"PeriodicalIF":4.6,"publicationDate":"2025-07-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144685940","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":"Electromagnetic modulation of memristor-based neuronal dynamics","authors":"Yun-sha Hu ,&nbsp;Ming-xin Xu ,&nbsp;Jing-lin Xu ,&nbsp;Hong-biao Li ,&nbsp;Guo-ping Sun","doi":"10.1016/j.cjph.2025.06.044","DOIUrl":"10.1016/j.cjph.2025.06.044","url":null,"abstract":"<div><div>The cell fluid around neurons contains ions such as <span><math><msup><mrow><mi>K</mi></mrow><mrow><mo>+</mo></mrow></msup></math></span>, <span><math><mrow><mi>N</mi><msup><mrow><mi>a</mi></mrow><mrow><mo>+</mo></mrow></msup></mrow></math></span> and <span><math><mrow><mi>C</mi><msup><mrow><mi>l</mi></mrow><mrow><mo>−</mo></mrow></msup></mrow></math></span>, where ion adsorption on the neuronal membrane creates capacitive characteristics, while stochastic transport through irregular channel proteins across the membrane manifests inductive properties. This study constructs an electromagnetic-sensitive neuron model addressing electromagnetic field fluctuations during cytosol flow, incorporating flux-controlled and charge-controlled memristors to respectively participate in membrane potential voltage division and channel current shunting, with additional periodic stimulation for electrophysiological regulation. Helmholtz theorem verification is implemented for isolated neurons. Accounting for external electromagnetic field disturbances, Gaussian white noise perturbations are introduced to simulate the induced voltage components in charge-controlled memristors and induced current components in flux-controlled memristors. Membrane parameter <span><math><mi>c</mi></math></span> undergoes adaptive control considering neuronal deformation. Simulations show that periodic stimulation and memristor parameter adjustments yield chaotic, periodic, bursting, and spiking discharge modes, each with distinct energy storage traits. No significant stochastic resonance emerges under noise intervention, while parameter <span><math><mi>c</mi></math></span> achieves energy self-adaptive regulation through stabilization control.</div></div>","PeriodicalId":10340,"journal":{"name":"Chinese Journal of Physics","volume":"97 ","pages":"Pages 734-743"},"PeriodicalIF":4.6,"publicationDate":"2025-07-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144779415","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}