Chinese Journal of Physics最新文献

英文中文

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 Q1 PHYSICS, MULTIDISCIPLINARY

Chinese Journal of Physics

Pub Date : 2024-12-01 DOI: 10.1016/j.cjph.2024.11.014

Arvind Patel, Yogeeta Garg

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

R e_{s}

. 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

R e_{s} = 10

(highly viscous flow), 50, 200, 1000 (slightly viscous flow), and

R e_{s} \to \infty

(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.

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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 Q1 PHYSICS, MULTIDISCIPLINARY

Chinese Journal of Physics

Pub Date : 2024-11-19 DOI: 10.1016/j.cjph.2024.10.034

Ángel Rincón , Grigoris Panotopoulos , Ilídio Lopes

We compute the quadrupolar gravitoelectric tidal Love numbers of spherical configurations made of anisotropic matter. Anisotropies are introduced within the vanishing complexity factor, while interior solutions are obtained adopting the Extended Chaplygin gas equation-of-state. A comparison with a more conventional approach is made as well.

我们计算了由各向异性物质构成的球形构型的四极引力电潮汐爱数。各向异性是在复杂性系数消失时引入的，而内部解则是采用扩展查普利金气体状态方程得到的。同时还与更传统的方法进行了比较。

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 Q1 PHYSICS, MULTIDISCIPLINARY

Chinese Journal of Physics

Pub Date : 2024-11-16 DOI: 10.1016/j.cjph.2024.11.018

Somaye Zare , Niti Kant , Oriza Kamboj

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.

最近的研究重点是在热量子等离子体中传播两束高斯激光，并考虑到相对论机制。第二束激光的存在会影响等离子体中另一束激光的聚焦，并发生交叉聚焦。考虑到等离子体非线性对两束光束强度的依赖性，我们估算出了等离子体非线性介电常数的表达式。通过假设量子流体力学模型，得到了热等离子体中两束光束动力学的非线性偏微分耦合方程。利用准轴射线近似和四阶 Runge-Kutta 方法对所得到的方程进行了数值求解。数值结果表明，第二束加强了相对论因子。此外，还研究了有无交叉聚焦机制下光束宽度参数和激光强度的变化。这项研究表明，交叉聚焦增强了激光聚焦。这些结果有助于理解激光在量子等离子体中的传播机制，这对现代集成电路框架实验中的快速点火非常重要，在这种实验中，氘氚等离子体被强激光束压缩，量子效应占主导地位。

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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 Q1 PHYSICS, MULTIDISCIPLINARY

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

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.

本研究利用卟啉/芘连接的共价有机框架（COF）可饱和吸收体，首次观察和研究了掺铒光纤激光器系统从类噪声脉冲（NLP）到耗散孤子共振（DSR）的动态演化过程。实验结果表明，通过调节泵浦功率，激光器的工作状态可以从 NLPs 过渡到 DSR。此外，还分析了从 NLPs 到 DSR 的转变与 COF 材料内部从可饱和吸收到反向可饱和吸收（RSA）的变化之间的相关性，从而得出吸收随泵浦功率增加而变化在这一过程中起着关键作用。提出了光谱滤波效应与 RSA 之间的竞争机制，观察到的结果与提出的模型相当吻合。这项研究不仅揭示了光纤激光器中脉冲动力学的新特征，还凸显了晶体多孔材料在非线性光学应用中的潜力。它为进一步探索新型二维材料在超快光学领域的应用提供了重要的实验基础。

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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 Q1 PHYSICS, MULTIDISCIPLINARY

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

The paper demonstrates the ability to manipulate diffraction order intensity by combining a geometric phase (Pancharatnam–Berry phase) metasurface and a Tamm plasmon polariton based structure. This combination enables the simultaneous occurrence of resonant and non-resonant variations in the phase of the reflected light. It is shown that, when a meta-atom composed of antimony trisulfide undergoes a transition from an amorphous to a crystalline state, accompanied by a change in the polarization of the incident light, there is a redistribution of intensity between 0 and

\pm

1 diffraction orders.

论文展示了通过将几何相位（Pancharatnam-Berry 相位）元表面与基于塔姆等离子体极化子的结构相结合来操纵衍射阶强度的能力。这种组合能使反射光的相位同时发生共振和非共振变化。研究表明，当由三硫化二锑组成的元原子从非晶态过渡到晶体态时，伴随着入射光偏振的变化，在 0 和 ±1 衍射阶数之间会出现强度的重新分布。

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 Q1 PHYSICS, MULTIDISCIPLINARY

Chinese Journal of Physics

Pub Date : 2024-11-14 DOI: 10.1016/j.cjph.2024.11.010

Ying Xu , Huixin Qin

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.

热敏神经元可以检测外部温度的变化，并将外部物理信息转化为神经信号。外部温度被转化为等效的电刺激，通过调整外部电信号来控制这些神经元的兴奋性。这些神经元表现出一定程度的适应性，只有在特定温度范围内受到外部刺激时才会诱发适当的放电模式。因此，由温度调节神经回路形成的热敏神经元可用于研究热敏神经元的信号处理和机械臂的控制。本文构建了基于神经回路的温度传感机械臂系统，并研究了温度对热敏神经元调控机械臂系统动态行为的影响。通过数值模拟研究了外部刺激电流和温度对图案形成的影响。膜电位的分岔分析揭示了电活动和模式选择的转换。膜电位分岔分析揭示了电活动的模式转换及其对机械臂位移的影响。结果表明，随着温度的变化，膜电位表现出不同的放电模式，进而影响机械臂的最大位移。神经回路和机械臂之间的耦合促进了信号在系统中的有效传播。研究发现，在一个合适的温度范围内，耦合系统的机械臂可以稳定地前后移动。研究结果证实，外部温度可以影响神经元的发射模式，并控制机械臂的位移。

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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 Q1 PHYSICS, MULTIDISCIPLINARY

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

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 Fe₃O₄, Al₂O₃ and ZnO 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.

三元混合纳米流体在交通、电子和能源领域应用广泛。这些领域包括太阳能集热器、现代电子设备冷却系统、核反应堆、飞机和汽车。因此，本研究探讨了三元混合纳米流体流过具有质量吸力的弯曲伸缩表面的非稳态流动。将 Fe3O4、Al2O3 和 ZnO 纳米材料浸入煤油或水等基液中，形成三元混合纳米流体。此外，还考虑了随时间变化的磁场、热辐射和发热的影响。应用合适的相似变量将偏微分方程转换为常微分方程。然后，使用 MATLAB 中的 bvp4c 求解器对这些方程进行数值求解。在特定的拉伸/收缩参数范围内发现了二元解。为了建立稳定的解，通过计算最小特征值进行了稳定性测试。结果表明，三元混合纳米流体的双解范围更大。通过增加磁参数和发热参数，提高了热传输率。煤油的速度和剪切应力曲线较高，而水作为基础流体的温度曲线较高。流体速度和剪切应力与磁性参数和吸力参数有直接关系，而流体温度与它们有反向关系。通过增加辐射参数和发热参数可以提高流体温度。稳定性测试表明，只有第一种方案是稳定的，而第二种方案是不稳定的。这项研究的一些潜在用途包括高温和冷却过程、药物、生物传感器、航空航天技术和金属涂层。

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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 Q1 PHYSICS, MULTIDISCIPLINARY

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

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.

The velocity profile increases near the channel center with higher Q (time-mean flow rate) and

\bar{e}

(slip parameter), but decreases with greater Weissenberg number (We). The Brinkman number (Br), Q, and

\bar{e}

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

\bar{e}

. It is noteworthy that the overall number of trapped zones rises throughout the complex wavy path.

本文讨论了约翰逊-塞格曼流体在由元纤毛组成的复杂波浪形通道中的传热特性。这种复杂的壁结构可用于仿生物系统的设计。流体在由纤毛元波浪产生的二维复杂波浪通道中的运动具有层流和不可压缩的特点。首先，将方程系统从固定参照系转换为波浪参照系。其次，利用缩放因子将运动方程（EOM）系统转换为非维度形式。数学分析采用了长波长和低雷诺数假设。采用扰动法求解轴向速度、温度、流函数、压升和传热系数的简化控制方程。图解了代表轴向速度、压力上升和流函数的方程，并利用基本理论原理解释了观察到的不同物理方面变化的原因。对由此产生的非线性系统生成了魏森堡数小值的解决方案。当前的研究调查了不同边界和流变对流体流动的影响。Q（时间平均流速）和 e¯（滑移参数）越高，通道中心附近的速度曲线越大，但魏森堡数（We）越大，速度曲线越小。布林克曼数（Br）、Q 和 e¯ 直接影响温度分布，而 We 的影响则相反。Q 越大，被捕获的栓子的大小和数量越多，但 We 和 e¯ 越大，被捕获的栓子的大小和数量越少。值得注意的是，在整个复杂的波浪形路径中，截留区的总数都在上升。

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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 Q1 PHYSICS, MULTIDISCIPLINARY

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

With the help of atomic-layer doping technology, we theoretically explore how to use a δ-potential to manipulate a temporal electron-spin splitter (TESS), which is based on a spin-orbit-coupling (SOC) modulated magnetic nanostructure. Due to the SOC, the dwell time still depends on electron spins even if a δ-doping is embedded inside the TESS. Moreover, both the magnitude and sign of spin polarization ratio can be controlled by tuning the weight or position of the δ-doping. Therefore, a structurally manipulable TESS device can be obtained for semiconductor spintronic device applications.

在原子层掺杂技术的帮助下，我们从理论上探索了如何利用δ电位来操纵基于自旋轨道耦合（SOC）调制磁性纳米结构的时空电子自旋分离器（TESS）。由于存在自旋轨道耦合，即使在 TESS 内嵌入了 δ 掺杂，停留时间仍然取决于电子自旋。此外，自旋极化率的大小和符号都可以通过调整δ掺杂的重量或位置来控制。因此，可以获得一种结构上可操控的 TESS 器件，用于半导体自旋电子器件的应用。

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 Q1 PHYSICS, MULTIDISCIPLINARY

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

We propose a scheme to achieve simultaneous cooling of the mechanical and radio-frequency resonators in a hybrid optoelectromechanical system. By introducing the voltage modulation switch and intracavity-squeezed light, the high-frequency difference resonators can be successfully cooled to their quantum ground states by eliminating cavity mode dissipation through precise phase and amplitude matching of the squeezed pump field and the cooling optical field. More significantly, ground-state cooling can be achieved even in the highly unresolved sideband regime, and the quantum backaction heating can be effectively suppressed, leading to a significant improvement in cooling performance. Our work provides an alternative approach for quantum coherent manipulation of multiple mechanical systems with different resonant frequencies.

我们提出了一种在混合光机电系统中同时冷却机械谐振器和射频谐振器的方案。通过引入电压调制开关和腔内挤压光，高频差谐振器可以通过挤压泵浦场和冷却光场的精确相位和振幅匹配来消除腔模耗散，从而成功冷却到其量子基态。更重要的是，即使在高度未分辨的边带系统中也能实现地态冷却，量子反作用加热也能得到有效抑制，从而显著提高冷却性能。我们的工作为具有不同共振频率的多个机械系统的量子相干操纵提供了另一种方法。

引用次数: 0

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