Chinese Journal of Physics最新文献

{"title":"Impact of non-metricity and matter source on the geometry of anisotropic spheres","authors":"M. Zeeshan Gul ,&nbsp;M. Sharif ,&nbsp;Adeeba Arooj ,&nbsp;Baiju Dayanandan","doi":"10.1016/j.cjph.2024.11.021","DOIUrl":"10.1016/j.cjph.2024.11.021","url":null,"abstract":"<div><div>This paper delves into the impact of extended symmetric teleparallel theory on anisotropic compact stellar structures. The explicit field equations were formulated by considering a minimum model of this extended gravity. Basically, the Darmois junction conditions are used to determine the unknown constants of metric coefficients. We explore some significant properties of the compact stars under consideration to check their viable existence in this modified framework. The Tolman–Oppenheimer–Volkoff equation assess the equilibrium state of the compact stars. Moreover, the stability analysis is defined by using methods based on sound speed (related to how disturbances propagate in the star) and adiabatic index (related to the thermodynamic behavior of the star). We find that the proposed compact stars in the <span><math><mrow><mi>f</mi><mrow><mo>(</mo><mi>Q</mi><mo>,</mo><mi>T</mi><mo>)</mo></mrow></mrow></math></span> gravity are physically viable and stable.</div></div>","PeriodicalId":10340,"journal":{"name":"Chinese Journal of Physics","volume":"93 ","pages":"Pages 256-270"},"PeriodicalIF":4.6,"publicationDate":"2025-02-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143168056","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":"Joule heating and viscous dissipation impact on MHD-hybrid nanofluid flow over non-isothermal stretching/shrinking surface: Dual solution and stability analysis","authors":"Sakinah Idris ,&nbsp;Anuar Jamaludin ,&nbsp;Roslinda Nazar ,&nbsp;Ioan Pop","doi":"10.1016/j.cjph.2024.12.019","DOIUrl":"10.1016/j.cjph.2024.12.019","url":null,"abstract":"<div><div>Recent scientific research has consistently demonstrated that hybrid nanofluids have superior thermophysical properties, promising heat transfer efficiency improvers in engineering applications. Thus, the aim of this study is to numerically examine the effects of the magnetohydrodynamic (MHD), suction, Joule heating and viscous dissipation parameter on the intricate flow and thermal transfer dynamics of a hybrid nanofluid streaming over a permeable non-isothermal surface with a further investigation into duality of solutions. Similarity transformation reduced the governing equations into ordinary differential equations (ODEs), which were resolved using the MATLAB bvp4c function. The concurrent effects of the governing parameters on the temperature and velocity profiles, local skin friction coefficient, and the local Nusselt number were examined by hybridizing magnetite (Fe₃O₄) and multi-walled carbon nanotubes (MWCNT) immersed in water. The most notable finding of this study reported a higher magnetic parameter and nanoparticle volume concentration increased the skin friction coefficient in the shrinking region. Remarkably, a higher Eckert number increased the thermal boundary layer and reduced the heat transfer rate. Stability analysis confirmed that the first solution was physically stable and reliable. These discoveries contribute valuable insights into optimizing heat transfer in advanced engineering systems where precise thermal control is critical and guidance for scholars in investigating the experimental or numerical dimensions of flow dynamic of hybrid nanofluid.</div></div>","PeriodicalId":10340,"journal":{"name":"Chinese Journal of Physics","volume":"93 ","pages":"Pages 611-631"},"PeriodicalIF":4.6,"publicationDate":"2025-02-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143167077","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":"Hydrodynamic Impact of Dusty Fluid-Suspended Solid Particles in a Single-Walled Corrugated Channel for Water-Curing Infrastructure Networks","authors":"M.M. Maher ,&nbsp;Kh. S. Mekheimer ,&nbsp;H. Al‐Wahsh ,&nbsp;A.Z. Zaher","doi":"10.1016/j.cjph.2024.08.014","DOIUrl":"10.1016/j.cjph.2024.08.014","url":null,"abstract":"<div><div>Infrastructure engineering is impacted by solid particles in fluids, and engineering components are influenced by fluid flow methods. This work explores the effects of dusty fluids with suspended solid particles in a single-walled corrugated channel using electromagnetic hydrodynamics. Potential, continuity, and momentum equations were employed to study the periodic sinusoidal waves in the corrugations of two wavy walls using the perturbation method. We assessed the impact of corrugation on velocity for EMHD fluid flow using mathematical computation, concentrating on the analytical velocity solutions. The analysis of velocity profiles through graphs reveals that corrugation affects fluid and particle velocity behavior, with small amplitude reducing wave effects and dusty particles boosting velocity. The proposed model uses mathematical induction to solve engineering problems using corrugated wall conditions for fluid control during curing stages. It may be valuable for sanitation networks, rainwater drainage networks, and irrigation systems. In the end, a thorough examination of the obtained results and information from past papers demonstrated a high level of agreement. Additionally, its use in the curing of water will offer alternative methods of managing the flowing fluid than mechanical pressure.</div></div>","PeriodicalId":10340,"journal":{"name":"Chinese Journal of Physics","volume":"93 ","pages":"Pages 482-502"},"PeriodicalIF":4.6,"publicationDate":"2025-02-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143167085","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":"Transition temperature to the Bose-Einstein condensation of spin polarized tritium, hydrogen, and 4He gases using the second virial coefficient","authors":"B.R. Joudeh","doi":"10.1016/j.cjph.2024.12.011","DOIUrl":"10.1016/j.cjph.2024.12.011","url":null,"abstract":"<div><div>In this study, the transition temperature to the Bose-Einstein condensation of spin-polarized tritium (T↓), hydrogen (H↓), and ⁴He gases is obtained based on the second virial coefficient. The computations are performed using the Silvera triplet-state potential and HFDHE2 potential for spin-polarized atomic hydrogen isotopes and ⁴He gas, respectively. The thermophysical properties of these Bose systems are computed, including the Helmholtz free energy, entropy, the acoustic virial coefficient, and the second virial coefficient. Large negative values of the second virial coefficient and the acoustic virial coefficient are obtained, reflecting the strong overall attraction of inter-bosonic potential, which gives an indication of the onset of condensation at very low temperatures. At the transition temperature, the stable minimum of the Helmholtz free energy is an indicator of the sort of Bose-Einstein condensation (BEC). As a consequence, the system made a transition to a higher-order state, which is recognized with BEC and explored. The transition temperature is shifted towards a lower value than for the ideal Bose gas.</div></div>","PeriodicalId":10340,"journal":{"name":"Chinese Journal of Physics","volume":"93 ","pages":"Pages 318-327"},"PeriodicalIF":4.6,"publicationDate":"2025-02-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143167917","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":"Robust entangled state transmission and preparation in a trimer-like chain","authors":"Li-Na Zheng ,&nbsp;Hong-Fu Wang ,&nbsp;Xuexi Yi","doi":"10.1016/j.cjph.2024.12.009","DOIUrl":"10.1016/j.cjph.2024.12.009","url":null,"abstract":"<div><div>We propose a scheme to achieve entangled state transmission and preparation via the topologically protected gap states in a trimer-like chain. By employing the trimer chain with tunable coupling strength, the transmission channel depending on the peculiar distribution of the gap states can be constructed, which allows for an entangled state transmission from the leftmost end to the rightmost end. We emphasize that the gap states are protected by the energy gap and, hence, are naturally immune to the mild disorder of coupling strength and on-site potential. Moreover, the chain manifests good scalability and can be extended to a local nonreciprocal coupling configuration. Combining the comprehensive influence of the gap state distribution characteristics and the local nonreciprocal coupling modulation, we implement a reliable entangled state preparation through the dynamical evolution of the gap states, in which the entangled state possesses an arbitrary entanglement form. Our work provides a method for investigating the transmission and preparation of entangled states within an extended Su–Schrieffer–Heeger model and is valuable for future quantum technologies relying on entanglement resources.</div></div>","PeriodicalId":10340,"journal":{"name":"Chinese Journal of Physics","volume":"93 ","pages":"Pages 471-481"},"PeriodicalIF":4.6,"publicationDate":"2025-02-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143167924","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":"Terahertz characteristics of Mg-doped CuCrO2 and its application to 2π phase modulators with high tunable capability","authors":"Chao-Kuei Lee ,&nbsp;Jun-Ting Guo ,&nbsp;Pei-Jung Wu ,&nbsp;Jia-Chi Lan ,&nbsp;Yi-Han Lin ,&nbsp;Yi-An Wei ,&nbsp;Te-Wei Chiu ,&nbsp;Chien-Ming Lei ,&nbsp;Tsung-Hsien Lin ,&nbsp;Chan-Shan Yang","doi":"10.1016/j.cjph.2024.09.029","DOIUrl":"10.1016/j.cjph.2024.09.029","url":null,"abstract":"<div><div>We have conducted a detailed characterization of the optical properties of Mg-doped CuCrO₂ (CuCrO₂: Mg) in the terahertz (THz) frequency range. By utilizing CuCrO₂: Mg as transparent electrodes, we have demonstrated the approach for developing high-transmittance and low-operative-voltage THz phase shifters by electrically tuning liquid crystals (LCs). Unlike traditional indium-tin-oxide thin films, we have applied 600 nm-thick CuCrO₂: Mg thin films as transparent electrodes, and our results show that this material has great potential for THz photonics. Specifically, the transparent electrode with THz transmission of ∼92 % reveals the feasibility of CuCrO₂: Mg as a suitable material for THz photonics applications. The phase shifter scheme, which employs a ∼2.2 mm-thick cell, achieves a THz transmittance ∼70 %, a phase shift of more than 2π at 1.0 THz can be achieved even for low driving voltages of 14 V(rms). By considering the figure of merit (FOM) of LCs phase modulators defined in this work, the device based on CuCrO₂: Mg thin film shows an FOM value of 17.99; much higher than previously reported values. These results suggest that functional electrodes based on CuCrO₂: Mg thin films are promising components of THz and 6 G devices.</div></div>","PeriodicalId":10340,"journal":{"name":"Chinese Journal of Physics","volume":"93 ","pages":"Pages 577-583"},"PeriodicalIF":4.6,"publicationDate":"2025-02-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143168067","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":"Insights in the nonlinear instability of a ferromagnetic fluid jet","authors":"Galal M. Moatimid,&nbsp;Mona A.A. Mohamed,&nbsp;Khaled Elagamy","doi":"10.1016/j.cjph.2024.12.028","DOIUrl":"10.1016/j.cjph.2024.12.028","url":null,"abstract":"<div><div>The objective of the current study is to scrutinize the nonlinear instability of a cylindrical interface linking two distinct viscoelastic magnetic fluids. The viscoelastic fluid obeys the Eyring-Powell non-Newtonian (EPF) type. It is supposed that the liquids are initially streaming with uniform velocities and saturated in a permeable media. Additionally, an unchanged axial magnetic field (MF) is pervaded by the presence of surface tension (ST). The motivation of the current matter is essential for sophisticated material processing and precision engineering, as it enhances their stability and responsiveness under diverse situations, facilitating more efficient devices and novel applications in microfluidics and soft robotics. It is also improved the material processing, biomedical devices, flexible electronics, and drug delivery systems, in addition to optimizing ferrofluid-based actuators and sensors in MFs. The methodology of the analysis is grounded in the non-perturbative approach (NPA). This methodology is established mainly on He's frequency formula (HFF). To relax the calculated manipulation, the viscous potential theory (VPT) is employed. The linear partial differential equations (PDEs) governing the motion are solved in light of the nonlinear boundary conditions (BCs). This organization produced a complicated nonlinear characteristic PDE. A procedure concerning the non-dimensional analysis is adopted to reveal a set of dimensionless physical parameters. A compound nonlinear specific formula with complex factors has resulted in the form of the former procedure. It is discovered that ignoring the Weber number excludes all the imaginary components. The nonlinear characteristic ODE is studied in instances of the real besides the complex coefficients. A set of diagrams is plotted to display the stability configuration with the variation of diverse physical pertinent parameters. The stability zones fluctuate between increasing and decreasing due to various characteristics, although remains predominantly stable. Additionally, a collection of PolarPlots moreover time variation and phase plane diagrams are illustrated for the equivalent solution to grantee stable solutions. The damping in the complex solution is increasing and speeding with the rise of the amplitude factor and the wave number.</div></div>","PeriodicalId":10340,"journal":{"name":"Chinese Journal of Physics","volume":"93 ","pages":"Pages 442-470"},"PeriodicalIF":4.6,"publicationDate":"2025-02-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143167087","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 five-dimensional thermos-controlled system with a simple attractive torus and synchronous application","authors":"Shaohui Yan,&nbsp;Bian Zheng,&nbsp;Jianwei Jiang","doi":"10.1016/j.cjph.2024.11.013","DOIUrl":"10.1016/j.cjph.2024.11.013","url":null,"abstract":"<div><div>As a classic volume-conservative system, the Nose–Hoover chain can generate conservative chaos and nested invariant tori. This article utilizes the Nose–Hoover chain to produce a new five-dimensional thermos-controlled system, discovering the coexistence of conservative flows and dissipative attractors. A local analysis of the system reveals a fold-Hopf bifurcation. The system model becomes meaningful only when <span><math><mrow><mi>T</mi><mo>&gt;</mo><mn>0</mn></mrow></math></span>, resulting in continuous energy fluctuations within the system that manifest as chaotic or other complex behaviors. Then, the dynamical behaviors of the system are studied, and in addition to the coexistence phenomenon, the system also exhibits transient chaos. And its implementation is realized using FPGA (Field Programmable Gate Array) technology. Finally, adaptive finite-time projective synchronization is designed and implemented for homeogeneous systems, and heterogeneous adaptive finite-time projective synchronization is achieved with a five-dimensional conservative system.</div></div>","PeriodicalId":10340,"journal":{"name":"Chinese Journal of Physics","volume":"93 ","pages":"Pages 348-367"},"PeriodicalIF":4.6,"publicationDate":"2025-02-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143167918","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":"On IFDM simulation of Oldroyd 8-constant fluid flowing due to motile microorganisms","authors":"Zeeshan Asghar ,&nbsp;Muhammad Waris Saeed Khan ,&nbsp;Nasir Ali ,&nbsp;Muhammad Waqas","doi":"10.1016/j.cjph.2024.11.033","DOIUrl":"10.1016/j.cjph.2024.11.033","url":null,"abstract":"<div><div>This work studies the motion of bacteria on the Oldroyd 8-constant slime layer to determine the fundamental mechanism of bacterium gliding over immune system cells based on creeping flow and long wavelength approximation applicable to Stokes equations. Galilean transformation is also utilized to convert the problem from the lab to a wave frame. The bacterial gliding speed and the fluid flow rate are computed using an implicit finite difference method (IFDM), and a root-finding algorithm. These computed pairs are utilized to get power dissipation. Our results show that, due to the effect of slime rheology, characterized by relaxation time and retardation time, the gliding speed, flow rate of slime, and energy dissipation of bacteria are greatly modulated. Dynamic analysis shows that bacteria glide more quickly with reduced power dissipation when relaxation time is less than retardation time. On the other hand, relaxation time greater than the retardation time leads to slower bacterial swimming with increased energy consumption. The work presented here emphasizes that changes in the rheology of slime, specifically added time (relaxation and retardation time), can promote or inhibit bacterial motility. Additionally, the outcomes are confirmed using a separate technique based on bvp4c solver. A new comprehensive understanding of how this gliding happens (by controlling slime rheology and gliding gait) opens up possibilities for bio-inspired designs in the form of micro-robots or anti-fouling surfaces based on this work.</div></div>","PeriodicalId":10340,"journal":{"name":"Chinese Journal of Physics","volume":"93 ","pages":"Pages 158-171"},"PeriodicalIF":4.6,"publicationDate":"2025-02-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143167920","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":"MHD flow and heat transfer of nanotriple (Cu–Al2O3–Ag): Exact solutions","authors":"Waqar Khan Usafzai ,&nbsp;Nur Syahirah Wahid ,&nbsp;Norihan Md Arifin ,&nbsp;Emad H. Aly","doi":"10.1016/j.cjph.2024.11.029","DOIUrl":"10.1016/j.cjph.2024.11.029","url":null,"abstract":"<div><div>This work presents an in-depth analytical study of the flow and heat transfer characteristics of a nanotriple fluid system comprising copper, alumina, and silver nanoparticles, over a permeable, elastic, and deformable surface, subject to magnetohydrodynamics (MHD) and velocity slip conditions. Unlike many emerging numerical treatments of water-based nanotriple fluids, the primary objective is to derive exact, closed-form solutions, providing a substantial contribution to the analytical understanding of such complex systems. A unique aspect of this investigation is the identification of multiple algebraic-type solutions for the stretching/shrinking sheet problem, yielding dual solutions under injection and a single solution under suction conditions. In addition, critical numbers are identified as thresholds delineating the boundaries for the existence or absence of solutions. It is found that the number of solutions increases as the magnetic force strength decreases. Dual solutions are observed for both skin friction and thermal gradient in the exponential and algebraic cases. These analytical findings are further reinforced by extensive numerical computations, which offer robust validation of the exact solutions derived. Additionally, stability analysis is carried out in order to determine the stability of solutions, where the first branch demonstrates stability, and the second branch is unstable, highlighting the distinct behaviors within the solution branches.</div></div>","PeriodicalId":10340,"journal":{"name":"Chinese Journal of Physics","volume":"93 ","pages":"Pages 56-74"},"PeriodicalIF":4.6,"publicationDate":"2025-02-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143167922","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}