Chinese Journal of Physics最新文献

Lie group of similarity analysis of shock waves in viscous flow under magnetic field

IF 4.6 2区物理与天体物理

Chinese Journal of Physics Pub Date : 2024-12-01 DOI: 10.1016/j.cjph.2024.11.014

Arvind Patel, Yogeeta Garg

{"title":"Lie group of similarity analysis of shock waves in viscous flow under magnetic field","authors":"Arvind Patel, Yogeeta Garg","doi":"10.1016/j.cjph.2024.11.014","DOIUrl":"10.1016/j.cjph.2024.11.014","url":null,"abstract":"<div><div>This paper investigates the propagation of planar shock waves in an ideal gas under the viscous stress and magnetic field using the Lie group of similarity analysis. The ambient density and magnetic field both vary with shock radius as power and exponential law. Newton’s law of viscosity has been used and shock jump conditions have been derived for viscous flow by introducing shock Reynolds number <span><math><mrow><mi>R</mi><msub><mrow><mi>e</mi></mrow><mrow><mi>s</mi></mrow></msub></mrow></math></span>. The system of governing partial differential equations is reduced into a system of ordinary differential equations using the Lie group of invariance method and numerical solutions have been obtained for power and exponential law both. The effects of shock Reynolds number <span><math><mrow><mi>R</mi><msub><mrow><mi>e</mi></mrow><mrow><mi>s</mi></mrow></msub><mo>=</mo><mn>10</mn></mrow></math></span> (highly viscous flow), 50, 200, 1000 (slightly viscous flow), and <span><math><mrow><mi>R</mi><msub><mrow><mi>e</mi></mrow><mrow><mi>s</mi></mrow></msub><mo>→</mo><mi>∞</mi></mrow></math></span> (non-viscous flow), Alfven-Mach number, and ratio of specific heats have been discussed on the shock strength, piston position and flow variables behind the shock front. The magnetic field enhances the effect of viscous stress in exponential law but reduces in power law. All flow variables except viscous stress increase for power law and decrease for exponential law in viscous flow in comparison to non-viscous flow. Comparison of results of highly non-viscous flow with the corresponding results of inviscid flow establishes the validity of the model presented in this work. The results of this paper show the significant effect of viscosity on shock propagation contrary to the negligible effect in earlier studies.</div></div>","PeriodicalId":10340,"journal":{"name":"Chinese Journal of Physics","volume":"92 ","pages":"Pages 1531-1547"},"PeriodicalIF":4.6,"publicationDate":"2024-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142746047","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

Tidal Love numbers of anisotropic stars within the complexity factor formalism 各向异性恒星的潮汐爱数在复杂因子形式主义中的应用

IF 4.6 2区物理与天体物理

Chinese Journal of Physics Pub Date : 2024-11-19 DOI: 10.1016/j.cjph.2024.10.034

Ángel Rincón , Grigoris Panotopoulos , Ilídio Lopes

引用次数: 0

Relativistic cross-focusing of Gaussian laser beams in thermal quantum plasma 热量子等离子体中高斯激光束的相对论交叉聚焦

IF 4.6 2区物理与天体物理

Chinese Journal of Physics Pub Date : 2024-11-16 DOI: 10.1016/j.cjph.2024.11.018

Somaye Zare , Niti Kant , Oriza Kamboj

{"title":"Relativistic cross-focusing of Gaussian laser beams in thermal quantum plasma","authors":"Somaye Zare , Niti Kant , Oriza Kamboj","doi":"10.1016/j.cjph.2024.11.018","DOIUrl":"10.1016/j.cjph.2024.11.018","url":null,"abstract":"<div><div>Recent work focuses on propagating two intense Gaussian laser beams in thermal quantum plasma considering the relativistic regime. The presence of a second beam affects the focus of another beam in plasma and cross-focusing occurs. Considering the dependence of plasma nonlinearity on the intensity of both beams, an expression for the nonlinear dielectric constant of plasma has been estimated. Nonlinear partial differential coupled equations governing the dynamics of two beams in the thermal plasma are obtained by assuming a quantum hydrodynamic model. The obtained equations are solved numerically using the paraxial ray approximation and the fourth-order Runge-Kutta method. The numerical results show that the second beam strengthens the relativistic factor. Furthermore, variations of the beam width parameter and the laser intensity are investigated with and without the cross-focusing mechanism. This study presents that the cross-focusing enhances laser focusing. The results could be useful in understanding the mechanism of the laser propagation in the quantum plasma that is important in the fast ignition of modern ICF experiments, where deuterium-tritium plasma is compressed by intense laser beams and the quantum effects are dominant.</div></div>","PeriodicalId":10340,"journal":{"name":"Chinese Journal of Physics","volume":"92 ","pages":"Pages 1447-1454"},"PeriodicalIF":4.6,"publicationDate":"2024-11-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142719948","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

The evolution of dissipative soliton resonance from noise-like pulse via the saturable absorption to reverse saturable absorption transition within covalent organic framework saturable absorbers 在共价有机框架可饱和吸收体中，耗散孤子共振通过可饱和吸收到反向可饱和吸收的转变，从类似噪声的脉冲演化而来

IF 4.6 2区物理与天体物理

Chinese Journal of Physics Pub Date : 2024-11-16 DOI: 10.1016/j.cjph.2024.10.028

Hsuan-Sen Wang , Ahmed F.M. EL-Mahdy , Shiao-Wei Kuo , Wen-Hsuan Kuan , Kuei-Huei Lin , Gong-Ru Lin , Chao-Kuei Lee

{"title":"The evolution of dissipative soliton resonance from noise-like pulse via the saturable absorption to reverse saturable absorption transition within covalent organic framework saturable absorbers","authors":"Hsuan-Sen Wang , Ahmed F.M. EL-Mahdy , Shiao-Wei Kuo , Wen-Hsuan Kuan , Kuei-Huei Lin , Gong-Ru Lin , Chao-Kuei Lee","doi":"10.1016/j.cjph.2024.10.028","DOIUrl":"10.1016/j.cjph.2024.10.028","url":null,"abstract":"<div><div>In this study, for the first time, the dynamic evolution from noise-like pulses (NLPs) to dissipative soliton resonance (DSR) in an erbium-doped fiber laser system was observed and investigated by using a porphyrin/pyrene-linked covalent organic framework (COF) saturable absorber. Experimentally, by adjusting the pump power, the laser operation state was observed to be with a transition from NLPs to DSR. In addition, the correlation between the transition from NLPs to DSR and the variation from saturable absorption to reverse saturable absorption (RSA) within the COF material was analyzed, leading to the variation of absorption with increasing pump power playing a key role in this process. The competition mechanism between the spectral filtering effect and RSA was proposed, and the results observed agree quite well with the proposed model. This research not only reveals new features of pulse dynamics in fiber lasers but also highlights the potential of crystalline porous materials in nonlinear optical applications. It provides an important experimental foundation for further exploration of novel two-dimensional materials in the field of ultrafast optics.</div></div>","PeriodicalId":10340,"journal":{"name":"Chinese Journal of Physics","volume":"92 ","pages":"Pages 1267-1274"},"PeriodicalIF":4.6,"publicationDate":"2024-11-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142658493","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

Dynamic light manipulation by geometric phase metasurface incorporated to Tamm plasmon polariton structure 将几何相位元表面纳入塔姆等离子体极化子结构的动态光操控技术

IF 4.6 2区物理与天体物理

Chinese Journal of Physics Pub Date : 2024-11-15 DOI: 10.1016/j.cjph.2024.10.032

Rashid G. Bikbaev, Yurii V. Konov, Dmitrii A. Pykhtin, Ivan V. Timofeev

引用次数: 0

Dynamical response in an electromechanical arm driven by temperature-dependent neural circuit 由温度相关神经回路驱动的机电臂的动态响应

IF 4.6 2区物理与天体物理

Chinese Journal of Physics Pub Date : 2024-11-14 DOI: 10.1016/j.cjph.2024.11.010

Ying Xu , Huixin Qin

{"title":"Dynamical response in an electromechanical arm driven by temperature-dependent neural circuit","authors":"Ying Xu , Huixin Qin","doi":"10.1016/j.cjph.2024.11.010","DOIUrl":"10.1016/j.cjph.2024.11.010","url":null,"abstract":"<div><div>The thermosensitive neurons can detect changes in external temperature, and the external physical information is converted into neural signals. The external temperature is translated into an equivalent electrical stimulus, and the excitability of these neurons is controlled by adjusting the external electrical signal. These neurons exhibit a certain degree of adaptability, inducing appropriate discharge patterns only when subjected to external stimuli within a specific temperature range. Therefore, thermosensitive neurons formed by temperature regulated neural circuits can be used to study signal processing of thermosensitive neurons and control of mechanical arm. A temperature sensing mechanical arm system is constructed based on neural circuits in this article, and the influence of temperature on the dynamic behaviors of a mechanical arm system regulated by thermosensitive neurons is studied. Numerical simulations are performed to research the effect of external stimulation current and temperature on pattern formation. The bifurcation analysis of the membrane potential reveals the conversion in electrical activity and pattern selection. The bifurcation analysis of membrane potential reveals the mode switching of electrical activity and its impact on the displacement of the mechanical arm. The results indicate that as the temperature changes, the membrane potential exhibits different discharge patterns, which in turn affect the maximum displacement of the mechanical arm. The coupling between neural circuits and mechanical arm promotes effective signal propagation in the system. It is found that there is an appropriate temperature range that allowed the mechanical arm of the coupled system to move steadily back and forth. The research results confirm that external temperature can affect the firing mode of neurons and control the displacement of the mechanical arm.</div></div>","PeriodicalId":10340,"journal":{"name":"Chinese Journal of Physics","volume":"92 ","pages":"Pages 1384-1394"},"PeriodicalIF":4.6,"publicationDate":"2024-11-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142719952","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

Comparative investigation on radiative and heat generation effects of ternary hybrid nanofluid flow over a curved permeable surface: Stability analysis 三元混合纳米流体在弯曲渗透表面上流动的辐射效应和发热效应的对比研究：稳定性分析

IF 4.6 2区物理与天体物理

Chinese Journal of Physics Pub Date : 2024-11-13 DOI: 10.1016/j.cjph.2024.11.009

M.Z. Ullah , Z. Abbas , A.U. Rehman , F. Mallawi , H.M. Alshehri

{"title":"Comparative investigation on radiative and heat generation effects of ternary hybrid nanofluid flow over a curved permeable surface: Stability analysis","authors":"M.Z. Ullah , Z. Abbas , A.U. Rehman , F. Mallawi , H.M. Alshehri","doi":"10.1016/j.cjph.2024.11.009","DOIUrl":"10.1016/j.cjph.2024.11.009","url":null,"abstract":"<div><div>Ternary hybrid nanofluid has numerous applications in transportation, electronics, and energy sectors. These include solar collectors, modern electronic devices cooling systems, nuclear reactors, aircraft, and automobiles. Therefore, the unsteady flow of a ternary hybrid nanofluid past a curved stretching/shrinking surface with mass suction is explored. The nanomaterials of <em>Fe<sub>3</sub>O<sub>4</sub>, Al<sub>2</sub>O<sub>3</sub></em> and <em>ZnO</em> are immersed in a base fluid such as kerosene oil or water to form a ternary hybrid nanofluid. The impacts of time-dependent magnetic field, thermal radiation, and heat generation are also considered. Suitable similarity variables are applied for the conversion of partial differential equations into ordinary differential equations. Then, these equations are solved numerically with bvp4c solver in MATLAB. Dual solutions are discovered in a particular range of stretching/shrinking parameter. To establish a stable solution, a stability test is implemented by computing the smallest eigenvalues. The results yield that dual solutions range is higher with ternary hybrid nanofluid. The heat transport rate is elevated by growing the magnetic parameter and heat generation parameter. The profiles of velocity and shear stress are higher with kerosene oil while the temperature profile is higher with water as the base fluid. The fluid velocity and shear stress have a direct relation with magnetic parameter and suction parameter while the fluid temperature has an inverse relation with them. The fluid temperature is escalated by augmenting the radiation parameter and heat generation parameter. The stability test confirms that only the first solution is stable whereas the second solution is unstable. Some potential uses for this study include high-temperature and cooling processes, medications, biosensors, aerospace technologies, and metallic coatings.</div></div>","PeriodicalId":10340,"journal":{"name":"Chinese Journal of Physics","volume":"92 ","pages":"Pages 1455-1473"},"PeriodicalIF":4.6,"publicationDate":"2024-11-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142719794","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

An analytical exploration of low Reynolds number cilia-driven flow of Johnson-Segalman fluid with heat transfer effects 低雷诺数纤毛驱动的约翰逊-塞格曼流体流动与传热效应的分析探索

IF 4.6 2区物理与天体物理

Chinese Journal of Physics Pub Date : 2024-11-10 DOI: 10.1016/j.cjph.2024.11.006

Muhammad Ashfaq , Zeeshan Asghar , Yufeng NIE , Wasfi Shatanawi

{"title":"An analytical exploration of low Reynolds number cilia-driven flow of Johnson-Segalman fluid with heat transfer effects","authors":"Muhammad Ashfaq , Zeeshan Asghar , Yufeng NIE , Wasfi Shatanawi","doi":"10.1016/j.cjph.2024.11.006","DOIUrl":"10.1016/j.cjph.2024.11.006","url":null,"abstract":"<div><div>This article discusses the properties of heat transfer on Johnson-Segalman fluids in a complex wavy channel made of metachronal wavy cilia. Such complex wall structures can be used in the design of biomimetic systems. The movement of fluid through a two-dimensional complex wave channel produced by the metachronal wave of cilia is characterized as laminar and incompressible. Firstly, the system of equations is transformed from a fixed frame of reference to a wavy frame of reference. Secondly, the system of equations of motion (EOM) is transformed into a non-dimensional form by using the scaling factors. Mathematical analysis has been conducted using long wavelength as well as low Reynold numbers assumptions. The perturbation approach is used to solve the simplified governing equations for the axial velocity, temperature, stream function, pressure rise, and heat transfer coefficients. The equations representing axial velocity, pressure rise, and the streaming function are illustrated, and the reason for observed changes in different physical aspects are explained using basic theoretical principles. A solution for small values of the Weissenberg numbers is generated for the resulting nonlinear system. The current study investigates the effects of different boundaries and rheology on fluid flow.</div><div>The velocity profile increases near the channel center with higher Q (time-mean flow rate) and <span><math><mover><mi>e</mi><mo>¯</mo></mover></math></span> (slip parameter), but decreases with greater Weissenberg number (We). The Brinkman number (Br), Q, and <span><math><mover><mi>e</mi><mo>¯</mo></mover></math></span> directly influence the temperature distribution, while we have the opposite effect. The size and number of trapped boluses increase with higher Q but decrease with rising We and <span><math><mover><mi>e</mi><mo>¯</mo></mover></math></span>. It is noteworthy that the overall number of trapped zones rises throughout the complex wavy path.</div></div>","PeriodicalId":10340,"journal":{"name":"Chinese Journal of Physics","volume":"92 ","pages":"Pages 1492-1518"},"PeriodicalIF":4.6,"publicationDate":"2024-11-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142719947","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

Manipulating dwell time and spin polarization via δ-doping for electrons in spin-orbit-coupling modulated magnetic nanostructure 通过掺杂δ操纵自旋轨道耦合调制磁性纳米结构中电子的停留时间和自旋极化

IF 4.6 2区物理与天体物理

Chinese Journal of Physics Pub Date : 2024-11-09 DOI: 10.1016/j.cjph.2024.11.004

Li Wen, Mao-Wang Lu, Jia-Li Chen, Sai-Yan Chen, Xue-Li Cao, An-Qi Zhang

引用次数: 0

Simultaneous cooling of high-frequency difference resonators through voltage modulation and intracavity-squeezed light 通过电压调制和腔内挤压光同时冷却高频差谐振器

IF 4.6 2区物理与天体物理

Chinese Journal of Physics Pub Date : 2024-11-08 DOI: 10.1016/j.cjph.2024.10.033

Liang Wang , Wei Zhang , Tie Wang , Shutian Liu , Shou Zhang , Hong-Fu Wang

引用次数: 0