Chinese Journal of Physics最新文献

Darcy–Forchheimer flow driven by membrane pumping and magnetohydrodynamics: perturbation solution 膜泵送和磁流体动力学驱动的达西-福希海默流：摄动解

IF 4.6 2区物理与天体物理

Chinese Journal of Physics Pub Date : 2025-07-17 DOI: 10.1016/j.cjph.2025.06.004

Pankaj Jangid , Abhishesh Pandey , Dharmendra Tripathi , Kalpna Sharma

{"title":"Darcy–Forchheimer flow driven by membrane pumping and magnetohydrodynamics: perturbation solution","authors":"Pankaj Jangid , Abhishesh Pandey , Dharmendra Tripathi , Kalpna Sharma","doi":"10.1016/j.cjph.2025.06.004","DOIUrl":"10.1016/j.cjph.2025.06.004","url":null,"abstract":"<div><div>Membrane based pumping addresses the critical need for precise fluid control in biomedical applications, particularly in targeted drug delivery, dialysis, and biofluid circulation, by investigating magnetohydrodynamic (MHD) fluid flow in porous microchannels. The aim of this study is to develop a Darcy–Forchheimer-based MHD pumping model to analyze transient viscous fluid flow through a finite-length microchannel. The methodology involves modelling the upper wall of the channel as undergoing rhythmic, propagative membrane contractions to replicate physiological transport mechanisms and lower wall is stationary. A perturbation technique is employed to derive the analytical series solution, using lubrication theory and assuming a low Reynolds number. The effects of key parameters including the membrane shape parameter, Hartmann number, inverse Darcy number and Forchheimer number are examined on flow and pumping characteristics, shear stress and streamline patterns using MATLAB code. The results highlight that velocity reduces with increasing the Forchheimer number and Hartmann number due to enhanced inertial and Lorentz forces. In the microchannel, the maximum pressure difference is observed at the region where the membrane is located, highlighting the effectiveness of the pumping mechanism. The significance of this study lies in its contribution to the advancement of MHD-based biomedical micropumps, providing valuable insights into controlled fluid transport within microfluidic systems. These findings are especially important for enhancing the controlled and smooth process of biofluid dynamics at microscale without any contamination, and addressing critical challenges in biomedical engineering.</div></div>","PeriodicalId":10340,"journal":{"name":"Chinese Journal of Physics","volume":"96 ","pages":"Pages 1435-1452"},"PeriodicalIF":4.6,"publicationDate":"2025-07-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144655121","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

Probing a novel neutral heavy gauge boson within the mono-Z′ portal at the HL-LHC 在HL-LHC的mono-Z入口内探测一种新的中性重规玻色子

IF 4.6 2区物理与天体物理

Chinese Journal of Physics Pub Date : 2025-07-15 DOI: 10.1016/j.cjph.2025.07.005

Ali M. Hamed , El-sayed A. El-dahshan , S. Elgammal

引用次数: 0

Magnetic properties of a hexagonal Ising nanowire with spin-1/2 core and spin-5/2 shell 具有自旋1/2核和自旋5/2壳的六方Ising纳米线的磁性能

IF 4.6 2区物理与天体物理

Chinese Journal of Physics Pub Date : 2025-07-12 DOI: 10.1016/j.cjph.2025.06.042

I.A. Badrour, H. Saadi, N. Hachem, M. El Bouziani

引用次数: 0

Local error estimate of L1 scheme for time-fractional convection–diffusion–reaction equation on a star-shaped pipe network 星形管网时间分数阶对流扩散反应方程L1格式的局部误差估计

IF 4.6 2区物理与天体物理

Chinese Journal of Physics Pub Date : 2025-07-12 DOI: 10.1016/j.cjph.2025.06.040

Jingjia Wang, Xiangyun Meng, Yongguang Yu

{"title":"Local error estimate of L1 scheme for time-fractional convection–diffusion–reaction equation on a star-shaped pipe network","authors":"Jingjia Wang, Xiangyun Meng, 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}

引用次数: 0

Multiphase flow of three immiscible non-Newtonian fluids through porous cylindrical annulus under magnetic field 磁场作用下三种非牛顿非混相流体通过多孔圆柱环空的多相流动

IF 4.6 2区物理与天体物理

Chinese Journal of Physics Pub Date : 2025-07-11 DOI: 10.1016/j.cjph.2025.06.047

Satish Kumar , Satya Deo , Pankaj Kumar Maurya , Pawan Kumar Patel

{"title":"Multiphase flow of three immiscible non-Newtonian fluids through porous cylindrical annulus under magnetic field","authors":"Satish Kumar , Satya Deo , Pankaj Kumar Maurya , 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}

引用次数: 0

Universality in tidal response close to maximum mass of compact star in f(R,T) gravity f（R，T）重力下致密星最大质量附近潮汐响应的普遍性

IF 4.6 2区物理与天体物理

Chinese Journal of Physics Pub Date : 2025-07-10 DOI: 10.1016/j.cjph.2025.06.045

Kumar Gaurav Sagar , Neeraj Pant , Brajesh Pandey

引用次数: 0

Dirac neutrino mass in a U(1)L model with T7×Z4 symmetry 具有T7×Z4对称性的U(1)L模型中的狄拉克中微子质量

IF 4.6 2区物理与天体物理

Chinese Journal of Physics Pub Date : 2025-07-09 DOI: 10.1016/j.cjph.2025.06.031

V.V. Vien , Mayengbam Kishan Singh

引用次数: 0

Multifractal and spatial correlation analysis of dengue transmission in Brazilian metropolitan regions 巴西都市地区登革热传播的多重分形和空间相关分析

IF 4.6 2区物理与天体物理

Chinese Journal of Physics Pub Date : 2025-07-09 DOI: 10.1016/j.cjph.2025.06.025

Leonardo H.S. Fernandes , Jader S. Jale , José P.V. Fernandes , Benjamin Miranda Tabak , Maria A.R. Silva

{"title":"Multifractal and spatial correlation analysis of dengue transmission in Brazilian metropolitan regions","authors":"Leonardo H.S. Fernandes , Jader S. Jale , José P.V. Fernandes , Benjamin Miranda Tabak , Maria A.R. Silva","doi":"10.1016/j.cjph.2025.06.025","DOIUrl":"10.1016/j.cjph.2025.06.025","url":null,"abstract":"<div><div>This study investigates the spatial and temporal patterns of dengue incidence in three major Brazilian metropolitan regions: São Paulo, Rio de Janeiro, and Belo Horizonte. Our goal is to analyze the disease dynamics and its persistence in urban areas with different socio-environmental characteristics. We apply Multifractal Detrended Fluctuation Analysis (MF-DFA) and Moran’s Index to weekly incidence data from 2014 to 2024 to identify spatial clustering and long-term transmission patterns. Our results indicate persistent multifractal behavior in 10 cities <span><math><mfenced><mrow><msub><mrow><mi>α</mi></mrow><mrow><mn>0</mn></mrow></msub><mo>></mo><mn>0</mn><mo>.</mo><mn>5</mn></mrow></mfenced></math></span>, suggesting that dengue transmission is influenced by factors beyond seasonality and climate. High Moran index values during outbreaks confirm significant spatial clustering, emphasizing the need for localized intervention strategies. By integrating temporal fluctuations with spatial concentration analysis, this study provides insights for more effective public health policies.</div></div>","PeriodicalId":10340,"journal":{"name":"Chinese Journal of Physics","volume":"97 ","pages":"Pages 117-137"},"PeriodicalIF":4.6,"publicationDate":"2025-07-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144670851","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

Enhanced Birefringence Modes of surface plasmon polariton induced by a hybrid chiral QD medium 杂化手性量子点介质诱导表面等离子激元极化子的增强双折射模式

IF 4.6 2区物理与天体物理

Chinese Journal of Physics Pub Date : 2025-07-08 DOI: 10.1016/j.cjph.2025.06.041

Fatima Ghulam Kakepoto , Shihua Huang , Fuad A. Awwad , Emad A.A. Ismail , Muhammad Idrees

{"title":"Enhanced Birefringence Modes of surface plasmon polariton induced by a hybrid chiral QD medium","authors":"Fatima Ghulam Kakepoto , Shihua Huang , Fuad A. Awwad , Emad A.A. Ismail , Muhammad Idrees","doi":"10.1016/j.cjph.2025.06.041","DOIUrl":"10.1016/j.cjph.2025.06.041","url":null,"abstract":"<div><div>In this study, we propose a detailed theoretical approach to explore the birefringent surface plasmon polariton (SPP) modes at the interface of a hybrid nanostructure. This nanostructure comprises a gold (Au) metal layer combined with a chiral quantum dot (CQD) medium. The characteristics of SPP in this hybrid configuration are derived using detailed analytical methods based on Maxwell’s equations, with appropriate boundary conditions applied to ensure accuracy. Additionally, the dynamics of the CQD system are analyzed using the density matrix formalism, which enables a detailed description of the quantum interactions within the medium. Our analysis demonstrates that the birefringent SPP modes, discernible in both absorption and dispersion spectra, can be effectively controlled by manipulating key parameters such as inter-dot tunneling strength and spontaneous emission rates. This tunability also extends to the propagation length and phase shift of the birefringent SPP beams, which can be modulated under the same set of conditions. The ability to control these birefringent SPP modes offers significant potential for the development of advanced imaging systems and the design of compact, efficient nanophotonic devices. By utilizing the interaction between the CQD and the metallic interface, our study not only enhances the understanding of SPP behavior in hybrid nanostructures but also opens up new possibilities for the application of photonic technologies at the nanoscale. The engineering of these birefringent SPP modes could lead to substantial advancements in high-resolution imaging, the fabrication of novel photonic circuits, and other areas critical to the progression of nanophotonics.</div></div>","PeriodicalId":10340,"journal":{"name":"Chinese Journal of Physics","volume":"96 ","pages":"Pages 1344-1353"},"PeriodicalIF":4.6,"publicationDate":"2025-07-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144604868","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

Tunable contact properties in Cu2Te/metals via graphene interlayer 通过石墨烯中间层调节Cu2Te/金属的接触特性

IF 4.6 2区物理与天体物理

Chinese Journal of Physics Pub Date : 2025-07-08 DOI: 10.1016/j.cjph.2025.07.007

Minjun Zhou , Xi Geng , Xiao Fan , Qiyun Deng , Shiru Song , Lei Gao

{"title":"Tunable contact properties in Cu2Te/metals via graphene interlayer","authors":"Minjun Zhou , Xi Geng , Xiao Fan , Qiyun Deng , Shiru Song , Lei Gao","doi":"10.1016/j.cjph.2025.07.007","DOIUrl":"10.1016/j.cjph.2025.07.007","url":null,"abstract":"<div><div>The contact properties between two-dimensional (2D) channel materials and electrodes critically govern the overall performance of nanodevices. Recently fabricated semiconducting Cu<sub>2</sub>Te monolayer with high carrier mobility and exceptional environmental stability is a promising channel material for high-performance nanodevices. Herein, the contact properties of Cu<sub>2</sub>Te with various metals (Mo, W, Sb, Cu, and Ni) and the role of graphene interlayer in tailoring these interfaces are systematically investigated based on first-principles calculations. First-principles calculations reveal that, by intercalating graphene layers, the strong interactions between Cu<sub>2</sub>Te and metallic electrodes (Mo, W, Cu, and Ni) are weakened, enabling tunable contact types via work function engineering. The n-type Ohmic contacts at Cu<sub>2</sub>Te/Mo, Cu<sub>2</sub>Te/W, and Cu<sub>2</sub>Te/Cu interfaces transition to p-type behavior as the number of graphene layers increases, whereas Cu<sub>2</sub>Te/Ni interfaces exhibit no contact-type switching. By decoupling Cu<sub>2</sub>Te/metals, such graphene interlayers can suppress FLP and tailor contact types, which are beneficial for reconfigurable nanodevices. This work provides valuable theoretical insights for the development of high-performance Cu<sub>2</sub>Te-based nanodevices.</div></div>","PeriodicalId":10340,"journal":{"name":"Chinese Journal of Physics","volume":"97 ","pages":"Pages 109-116"},"PeriodicalIF":4.6,"publicationDate":"2025-07-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144666077","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