Chinese Journal of Physics最新文献_第4页

Thermal and computational analysis of MHD dissipative flow of Eyring–Powell fluid: Non-similar approach via overlapping grid-based spectral collocation scheme 艾林-鲍威尔流体的 MHD 耗散流的热分析和计算分析：通过基于重叠网格的频谱搭配方案的非相似方法

IF 4.6 2区物理与天体物理

Chinese Journal of Physics Pub Date : 2024-09-27 DOI: 10.1016/j.cjph.2024.09.035

Muhammad Idrees Afridi , M.P. Mkhatshwa , Muhammad Qasim , Ali J. Chamkha

{"title":"Thermal and computational analysis of MHD dissipative flow of Eyring–Powell fluid: Non-similar approach via overlapping grid-based spectral collocation scheme","authors":"Muhammad Idrees Afridi , M.P. Mkhatshwa , Muhammad Qasim , Ali J. Chamkha","doi":"10.1016/j.cjph.2024.09.035","DOIUrl":"10.1016/j.cjph.2024.09.035","url":null,"abstract":"<div><div>The aim of the present study is to numerically investigate the non-similar flow and heat transfer in a dissipative Eyring–Powell fluid (EPF) over a stretching surface. A constant magnetic field is applied perpendicular to the stretched surface to explore the impact of the Lorentz force. Both viscous and magnetic dissipation are considered to comprehensively examine their effects on heat transfer. The problem in hand does not admit self-similar solutions as the non-Newtonian fluid parameter varies with the spatial variable along the stream-wise direction. Consequently, the set of nonlinear partial differential equations, modeling the flow problem is nondimensionalized primarily by employing a pseudo-similarity variable and stream-wise coordinate. The non-dimensional set of nonlinear partial differential equations is solved by a newly developed and efficient “overlapping multi-domain bivariate spectral local linearization method (OMD-BSLLM)”. The current study includes residual error analysis and convergence tests to demonstrate the accuracy of the numerical method applied to the current mathematical model. Graphs show fluid flow and heat transfer results for different flow parameters, while tables display skin friction and Nusselt number values. The results indicate that the non-Newtonian fluid parameter enhances both the velocity profile and temperature distribution. The fluid decelerates with increasing the dimensionless stream wise coordinate and Hartmann number. Viscous dissipation and dimensionless stream-wise coordinate enhances the temperature profile.</div></div>","PeriodicalId":10340,"journal":{"name":"Chinese Journal of Physics","volume":null,"pages":null},"PeriodicalIF":4.6,"publicationDate":"2024-09-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142573018","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}

引用次数: 0

Minimally deformed regular Bardeen black hole solutions in Rastall theory 拉斯塔尔理论中的最小变形正则巴丁黑洞解

IF 4.6 2区物理与天体物理

Chinese Journal of Physics Pub Date : 2024-09-26 DOI: 10.1016/j.cjph.2024.09.027

M. Sharif , Malick Sallah

{"title":"Minimally deformed regular Bardeen black hole solutions in Rastall theory","authors":"M. Sharif , Malick Sallah","doi":"10.1016/j.cjph.2024.09.027","DOIUrl":"10.1016/j.cjph.2024.09.027","url":null,"abstract":"<div><div>In this study, we utilize the minimal geometric deformation technique of gravitational decoupling to extend the regular Bardeen black hole, leading to the derivation of new black hole solutions within the framework of Rastall theory. By decoupling the field equations associated with an extended matter source into two subsystems, we address the first subsystem using the metric components of the regular Bardeen black hole. The second subsystem, incorporating the effects of the additional source, is solved through a constraint imposed by a linear equation of state. By linearly combining the solutions of these subsystems, we obtain two extended models. We then explore the distinct physical properties of these models for specific values of the Rastall and decoupling parameters. Our investigations encompass effective thermodynamic variables such as density and anisotropic pressure, asymptotic flatness, energy conditions, and thermodynamic properties including Hawking temperature, entropy, and specific heat. The results reveal that both models violate asymptotic flatness of the resulting spacetimes. The violation of energy conditions indicate the presence of exotic matter, for both models. Nonetheless, the energy density, radial pressure, as well as the Hawking temperature exhibit acceptable behavior, while the specific heat and Hessian matrix suggest thermodynamic stability.</div></div>","PeriodicalId":10340,"journal":{"name":"Chinese Journal of Physics","volume":null,"pages":null},"PeriodicalIF":4.6,"publicationDate":"2024-09-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142526145","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}

引用次数: 0

Predicting the firing behaviour of neural network through the bifurcation analysis of derivative mean-field model 通过导数平均场模型的分岔分析预测神经网络的点火行为

IF 4.6 2区物理与天体物理

Chinese Journal of Physics Pub Date : 2024-09-25 DOI: 10.1016/j.cjph.2024.09.031

Junjie Wang , Jieqiong Xu , Xiaoyi Mo , Jimin Qiu

{"title":"Predicting the firing behaviour of neural network through the bifurcation analysis of derivative mean-field model","authors":"Junjie Wang , Jieqiong Xu , Xiaoyi Mo , Jimin Qiu","doi":"10.1016/j.cjph.2024.09.031","DOIUrl":"10.1016/j.cjph.2024.09.031","url":null,"abstract":"<div><div>The mean-field model is an important method for understanding the complex dynamics of the nervous system at different spatial levels and for simulating and theoretically analysing the collective dynamic behaviour of large neural populations. In the work, we construct an improved mean-field system of neural networks coupled with quadratic integrate-and-fire neurons and examine the discharge patterns for networks by analysing such a model, which is a three-dimensional smooth differential system. Bifurcation analysis of the mean-field model is conducted from both theoretical and simulation perspectives, we obtain the bifurcation conditions of some co-dimension-two bifurcations and divide the parameter space into different regimes by simulating two parameters bifurcation diagrams. We find a close correspondence, though with some variance, between the mean-field model and neural network when comparing the firing patterns of the two models in various parameter regimes. In summary, the obtained mean-field description builds the bridge between the parameters of neurons or networks and that of a mean-field system to ensure we can compare them and understand the connections between them. Specifically, the mean-field model can reflect the dynamics of neural networks from a macroscopic perspective, and its bifurcation can predict the behaviour of neural networks to a certain extent and understand the mechanisms behind them, such as bursting dynamics of neural networks.</div></div>","PeriodicalId":10340,"journal":{"name":"Chinese Journal of Physics","volume":null,"pages":null},"PeriodicalIF":4.6,"publicationDate":"2024-09-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142445600","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}

引用次数: 0

Influences of Newtonian heating and Darcy's law in micropolar fluid flow over a magnetized stretchable disk: A Bayesian analysis 磁化可拉伸圆盘上微极流体流动中牛顿加热和达西定律的影响：贝叶斯分析

IF 4.6 2区物理与天体物理

Chinese Journal of Physics Pub Date : 2024-09-24 DOI: 10.1016/j.cjph.2024.09.032

Mohammed Alkinidri , A. Rauf , A. Farooq , F. Mustafa , S.A. Shehzad , M.K. Siddiq

{"title":"Influences of Newtonian heating and Darcy's law in micropolar fluid flow over a magnetized stretchable disk: A Bayesian analysis","authors":"Mohammed Alkinidri , A. Rauf , A. Farooq , F. Mustafa , S.A. Shehzad , M.K. Siddiq","doi":"10.1016/j.cjph.2024.09.032","DOIUrl":"10.1016/j.cjph.2024.09.032","url":null,"abstract":"<div><div>A laminar two-dimensional magnetized micropolar fluid flow passed through a stretchable surface is examined. The axi-symmetric time-independent thermal flow experienced the impacts of Darcy's law, thermal conductivity, and Newtonian heating. The dimensionalized flow model is governed by similarity transformations. The resulting non-linear flow system is numerically solved through Runge-Kutta-Fehlberg (RKF-45) built in scheme. The graphics illustration of velocity and thermal fields for multiple physical parameters is presented. The numerical values at the disk surface for couple stresses, thermal rate, and shear stresses are also calculated. A Bayesian approach is used to assess the association degree amongst the under-study constraints and variables. The magnitude of the microrotational profiles is enhanced by the combined effect of micropolar parameters while an opposite effect is observed in microrotational field against magnetic and porosity parameters. The temperature field is modified through enhancing values of conjugate parameters. Moreover, such thermal field is larger for variable thermal conductivity as assumed to constant fluid property.</div></div>","PeriodicalId":10340,"journal":{"name":"Chinese Journal of Physics","volume":null,"pages":null},"PeriodicalIF":4.6,"publicationDate":"2024-09-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142417961","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}

引用次数: 0

Topological pumping in an inhomogeneous Aubry–André model 非均质奥布里-安德烈模型中的拓扑抽水

IF 4.6 2区物理与天体物理

Chinese Journal of Physics Pub Date : 2024-09-23 DOI: 10.1016/j.cjph.2024.09.028

Muhammad Sajid , Niaz Ali Khan , Muzamil Shah

{"title":"Topological pumping in an inhomogeneous Aubry–André model","authors":"Muhammad Sajid , Niaz Ali Khan , Muzamil Shah","doi":"10.1016/j.cjph.2024.09.028","DOIUrl":"10.1016/j.cjph.2024.09.028","url":null,"abstract":"<div><div>The Aubry–André model is a fundamental theoretical model that exhibits interesting topological features. In this paper, we examine topologically protected boundary states in the inhomogeneous off-diagonal Aubry–André model. In contrast to the homogeneous case, the inhomogeneity triggers boundary states at phase boundaries that separate two distinct non-trivial topological domains. Remarkably, the topological character of the boundary states is predicted through topological pumping, where a boundary state is transferred from one boundary across the bulk region to the other by adiabatically tuning the pump parameter. Moreover, the role of the off-diagonal modulation strength (<span><math><mi>λ</mi></math></span>) on the transfer efficiency of the topological pumping is addressed. To support our results, we investigate the time evolution of a continuous-time quantum walk and show that its spread rate and <span><math><mi>λ</mi></math></span> are inversely related. Our work provides a new avenue to harness topological features of the Aubry–André model, where topological pumping can be used for robust quantum transport.</div></div>","PeriodicalId":10340,"journal":{"name":"Chinese Journal of Physics","volume":null,"pages":null},"PeriodicalIF":4.6,"publicationDate":"2024-09-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142358111","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}

引用次数: 0

Study of gravastar admitting Tolman IV spacetime in Rastall theory 拉斯塔尔理论中的引力星接纳托尔曼 IV 时空研究

IF 4.6 2区物理与天体物理

Chinese Journal of Physics Pub Date : 2024-09-23 DOI: 10.1016/j.cjph.2024.09.026

M. Sharif, Tayyab Naseer, Areej Tabassum

引用次数: 0

Higher-order properties of multi-modal public transit networks 多模式公共交通网络的高阶特性

IF 4.6 2区物理与天体物理

Chinese Journal of Physics Pub Date : 2024-09-22 DOI: 10.1016/j.cjph.2024.09.033

Xiaohan Xu , Ailing Huang , Amer Shalaby , Zhihuan Jiang , Mengyuan Duan , Geqi Qi

{"title":"Higher-order properties of multi-modal public transit networks","authors":"Xiaohan Xu , Ailing Huang , Amer Shalaby , Zhihuan Jiang , Mengyuan Duan , Geqi Qi","doi":"10.1016/j.cjph.2024.09.033","DOIUrl":"10.1016/j.cjph.2024.09.033","url":null,"abstract":"<div><div>Over the years, research advances in public transit networks (PTNs) are restricted to pairwise interactions, while providing limited understanding of higher-order PTNs. In particular, exploring the higher-order interactions of multi-modal PTNs (MPTNs) can not only facilitate a more efficient and convenient way to meet the travel demands of passengers, but also improve the carrying capacity and attractiveness of public transit systems. Consequently, this paper characterizes the characteristic metrics of higher-order MPTNs and the node importance identification method considering higher-order cliques. The construction method of MPTNs and the metrics of higher-order network properties are first introduced. Based on investigating the characteristics of higher-order cliques, we then further design a node importance measure to explore the degree of station core of higher-order MPTNs. Finally, taking the Beijing public transit system as an example, three different types of MPTNs (including the bus network, bus-metro network, and bus-metro-taxi/ride-hailing network) are constructed, and their higher-order properties are statistically analyzed. The empirical study finds that the Beijing MPTNs with higher-order interactions have a large number of complex clique and cavity structures, which are typical of scale-free networks. In terms of node rankings, our proposed node importance measure incorporates rich information about the higher-order properties compared to well-known benchmark indices. Correspondingly, the measure performs overall better than other benchmarks in identifying the most vulnerable nodes under intentional attacks. The paper provides a reference for future exploration of the dynamic evolution mechanism of higher-order MPTNs, and can serve the actual network planning and design of urban MPTNs.</div></div>","PeriodicalId":10340,"journal":{"name":"Chinese Journal of Physics","volume":null,"pages":null},"PeriodicalIF":4.6,"publicationDate":"2024-09-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142417821","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}

引用次数: 0

Generation of quantum entanglement and Einstein–Podolsky–Rosen steering in a hybrid qubit-cavity optomagnonic system 在混合量子比特-腔光磁系统中产生量子纠缠和爱因斯坦-波多尔斯基-罗森转向

IF 4.6 2区物理与天体物理

Chinese Journal of Physics Pub Date : 2024-09-21 DOI: 10.1016/j.cjph.2024.09.024

Kai-Kai Zhang , Zhonghu Zhu , Tao Shui , Wen-Xing Yang

引用次数: 0

A problem with the conservation law observed in macroscopic quantum phenomena is a consequence of violation of the correspondence principle 在宏观量子现象中观察到的守恒定律问题是违反对应原理的结果

IF 4.6 2区物理与天体物理

Chinese Journal of Physics Pub Date : 2024-09-20 DOI: 10.1016/j.cjph.2024.09.023

A.V. Nikulov

{"title":"A problem with the conservation law observed in macroscopic quantum phenomena is a consequence of violation of the correspondence principle","authors":"A.V. Nikulov","doi":"10.1016/j.cjph.2024.09.023","DOIUrl":"10.1016/j.cjph.2024.09.023","url":null,"abstract":"<div><div>Jorge Hirsch drew attention to the contradiction of the Meissner effect with Faraday’s law and the law of angular momentum conservation. This article draws attention to the fact that the angular momentum can change without any force only due to quantization in both microscopic and macroscopic quantum phenomena. But if in the first case this change cannot exceed the Planck constant, then in the second case this change is macroscopic due to a violation of the correspondence principle. To explain the violation of the correspondence principle, Lev Landau postulated in 1941 that microscopic particles in superfluid helium and superconductor cannot move separately. Quantization can change not only the angular momentum, but also the kinetic energy of a superconducting condensate on a macroscopic amount. For this reason, the Meissner effect and other macroscopic quantum phenomena contradict the second law of thermodynamics. The reluctance of physicists to admit the violation of the second law of thermodynamics provoked a false understanding of the phenomenon of superconductivity and obvious contradictions in books on superconductivity.</div></div>","PeriodicalId":10340,"journal":{"name":"Chinese Journal of Physics","volume":null,"pages":null},"PeriodicalIF":4.6,"publicationDate":"2024-09-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142358113","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}

引用次数: 0

Thermal instability on heat and mass transfer of Oldroyd-B nanofluid with several types of gravity modulation in various enclosures 多种重力调制下奥尔德罗伊德-B 纳米流体在不同围护结构中传热传质的热不稳定性

IF 4.6 2区物理与天体物理

Chinese Journal of Physics Pub Date : 2024-09-19 DOI: 10.1016/j.cjph.2024.09.016

Anish Kumar , B.S. Bhadauria , Ismail , S.N. Rai

{"title":"Thermal instability on heat and mass transfer of Oldroyd-B nanofluid with several types of gravity modulation in various enclosures","authors":"Anish Kumar , B.S. Bhadauria , Ismail , S.N. Rai","doi":"10.1016/j.cjph.2024.09.016","DOIUrl":"10.1016/j.cjph.2024.09.016","url":null,"abstract":"<div><div>In this paper, the influence of three different types of gravity modulation on the stability of a layer of Oldroyd-B nanofluid in various enclosures is investigated. Gravity modulation using sine, square, and triangular waveforms can be significant. It has various applications, such as industrial processes, electronic cooling, and material science. The Oldroyd-B liquid model is significant because of its numerous applications, including the production of plastic sheets and polymer extrusion through a slit, dye in the polymer industry, biological solution of paint, tars, glues, and so on. We found the expression of the Rayleigh number by applying the normal mode technique in linear stability analysis. The results demonstrate that the porosity and porous parameters stabilize the system. The system becomes unstable due to the aspect ratio. This result implies that convection travels faster in a tall enclosure compared to a square enclosure and a shallow enclosure. In nonlinear analysis, we found the Nusselt and Sherwood numbers for heat and mass transportation. In heat and mass transfer, the Deborah number, retardation parameter, gravity modulation, porous parameter, porosity, and aspect ratio play essential roles. Porous parameter and porosity delayed the rate of heat and mass transportation. The value of the retardation parameter increases then the heat and mass transportation decreases. The system’s heat and mass transfer increases by increasing the Deborah number’s value. The aspect ratio increases the system’s heat and mass transfer. The heat and mass transfer in tall enclosure is much higher than in square and shallow enclosures.</div></div>","PeriodicalId":10340,"journal":{"name":"Chinese Journal of Physics","volume":null,"pages":null},"PeriodicalIF":4.6,"publicationDate":"2024-09-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142417957","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}

引用次数: 0