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Nanoscale resistive switching behaviour and photoabsorption response from NiO nanoflakes 氧化镍纳米片的纳米级电阻开关行为和光吸收响应
IF 1.9 4区 物理与天体物理 Q2 PHYSICS, MULTIDISCIPLINARY Pub Date : 2024-09-23 DOI: 10.1007/s12043-024-02830-2
Vanaraj Solanki, Shikha Varma

Hydrothermally grown NiO nanoflakes have been investigated here for their resistive switching (RS) and photoabsorption characteristics. The formation and disruption of the conducting filament (CF) under an applied external electric field leads to bistable resistive switching in the grown NiO nanoflakes. Comprehensive investigations of the I–V behaviour show that the formation and rupturing of the CF depend on the concentration of the metallic Ni. Interestingly, photoabsorption response demonstrates a nearly similar behaviour in UV and visible regions for nanoflakes grown at low reaction time, but an enhanced UV response for the flakes obtained at larger reaction times. These nanoflakes displaying multifunctional properties of photoabsorption and RS behaviour, that can be modulated with reaction time, are attractive for optoelectronic, electrochromic and RS-based memory applications.

本文研究了水热法生长的氧化镍纳米片的电阻开关(RS)和光吸收特性。在外加电场的作用下,导电丝(CF)的形成和断裂导致了生长的氧化镍纳米片的双稳态电阻开关。对 I-V 行为的全面研究表明,导电丝的形成和断裂取决于金属镍的浓度。有趣的是,在低反应时间下生长的纳米片的光吸收响应在紫外和可见光区域表现出几乎相似的行为,但在较长的反应时间下获得的纳米片的紫外响应增强。这些纳米薄片具有光吸收和 RS 行为的多功能特性,可随反应时间进行调节,对光电、电致变色和基于 RS 的存储器应用具有吸引力。
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引用次数: 0
Two-proton emission within a deformed Yukawa-plus-exponential model 变形育川加指数模型中的双质子发射
IF 1.9 4区 物理与天体物理 Q2 PHYSICS, MULTIDISCIPLINARY Pub Date : 2024-09-23 DOI: 10.1007/s12043-024-02817-z
P Mehana, N S Rajeswari

The Yukawa-plus-exponential model (YEM) is the modified form of liquid drop model incorporating parameter to include short-range interaction and surface diffuseness. We have studied two-proton (2p) radioactivity within the YEM for spherical nuclei in our previous work [Mehana and Rajeswari in Eur. Phys. J. A 59, 104 (2023)]. The present study is the extension of the previous work to apply the model to deformed 2p emitters. Deformation is incorporated in YEM through Coulomb potential and Yukawa interaction potential. The calculated half-lives are found to have less deviation than experimental half-lives, when compared to spherical ones. Further, half-lives are also predicted for 2p emitters which are not yet studied experimentally. The calculated half-lives show good match with half-lives predicted by other theoretical models. It is seen that the half-lives of the prolate-shaped daughter nuclei are lower than spherical nuclei of the same parent, whereas the half-lives of oblate daughters are higher than that of the spherical ones.

汤川加指数模型(YEM)是液滴模型的改进形式,其中包含短程相互作用和表面扩散参数。我们在以前的工作中[Mehana 和 Rajeswari 在 Eur. Phys. J. A 59, 104 (2023)]研究了 YEM 中球形原子核的双质子(2p)放射性。本研究是前一项工作的延伸,将模型应用于变形 2p 发射体。变形是通过库仑势和尤卡娃相互作用势纳入 YEM 的。与球形半衰期相比,计算得出的半衰期与实验半衰期的偏差较小。此外,还预测了尚未进行实验研究的 2p 发射器的半衰期。计算得出的半衰期与其他理论模型预测的半衰期非常吻合。可以看出,长球形子核的半衰期低于相同母核的球形子核,而扁球形子核的半衰期高于球形子核。
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引用次数: 0
Computing intelligence for the magnetised chemically reactive bidirectional radiative nanofluid flow through the Bayesian regularisation back-propagated neural network 通过贝叶斯正则化反向传播神经网络计算磁化化学反应双向辐射纳米流体流动的智能性
IF 1.9 4区 物理与天体物理 Q2 PHYSICS, MULTIDISCIPLINARY Pub Date : 2024-09-23 DOI: 10.1007/s12043-024-02794-3
Zahoor Shah, Muhammad Asif Zahoor Raja, Muhammad Shoaib, Shumaila Javeed, Taseer Muhammad, Mehboob Ali, Waqar Azeem Khan, Raja Zaki Haider

This research work aims to explain the model and assessment of a differential mathematical system of the magneto-bioconvection of the Williamson nanofluid model (MBWNFM) by capitalising on the strength of the stochastic technique through computational intelligence of Bayesian regularisation back-propagated neural networks (CIBRB-NNs). This facilitates a more accurate, reliable and proficient computation of the dynamics. A reference dataset is built using the Adams technique in the Mathematica software to depict multiple situations and account for numerous influential parameters of the MBWNFM. The reference data results are split into 70% for training and 30% for validation and testing methods. This approach aims to enhance the accuracy of the approximated results and enable them to be compared with established solutions. The demonstration of the accuracy and efficiency of the created CIBRB-NNs involves a comparison of the results obtained from the dataset using the Adams approach, by adjusting several influential parameters which include magnetic parameter ((M)), bioconvection Lewis Number ((L_{b})), thermal diffusivity ((alpha)) and thermal Biot number ((gamma)). The stability and accuracy of CIBRB-NNs are validated using various methodologies, including the analysis of fitness curves depicting mean square error, regression studies, evaluation of error using histogram plots and measurement of absolute errors. The excellent measures of performance in terms of MSE are achieved at levels 4.50e-12, 6.73e-13, 1.07e-13, 7.08e-13, 4.77e-13 and 1.70e-13 against 82, 150, 98, 83, 170 and 189 epochs. The error analysis of the proposed and reference datasets shows that CIBRB-NNS is authentic and precise, ranging from e-09 to e-04 for all scenarios.

这项研究工作旨在通过贝叶斯正则化反向传播神经网络(CIBRB-NNs)的计算智能,利用随机技术的优势,解释威廉姆森纳米流体模型(MBWNFM)的微分数学系统模型和评估。这有助于更准确、可靠和熟练地计算动力学。使用 Mathematica 软件中的亚当斯技术建立了一个参考数据集,以描述多种情况并考虑 MBWNFM 的众多影响参数。参考数据结果分为 70% 用于训练,30% 用于验证和测试方法。这种方法旨在提高近似结果的准确性,使其能够与既定解决方案进行比较。为了证明所创建的 CIBRB-NNs 的准确性和效率,我们使用亚当斯方法,通过调整几个有影响的参数,包括磁参数(M)、生物对流路易斯数(Lewis Number)、热扩散率(α)和热比奥特数(gamma),对数据集获得的结果进行了比较。CIBRB-NNs 的稳定性和准确性通过各种方法得到了验证,包括描述均方误差的适配曲线分析、回归研究、使用直方图评估误差以及测量绝对误差。在 82、150、98、83、170 和 189 epochs 的情况下,MSE 分别为 4.50e-12、6.73e-13、1.07e-13、7.08e-13、4.77e-13 和 1.70e-13。对建议数据集和参考数据集的误差分析表明,CIBRB-NNS 是真实和精确的,在所有情况下误差范围都在 e-09 到 e-04 之间。
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引用次数: 0
Dynamic analysis and chaos control of a unified chaotic system 统一混沌系统的动态分析和混沌控制
IF 1.9 4区 物理与天体物理 Q2 PHYSICS, MULTIDISCIPLINARY Pub Date : 2024-09-13 DOI: 10.1007/s12043-024-02744-z
Xia Wu, Xiaoling Qiu, Limi Hu

Two different control methods are proposed in this paper to effectively control the chaotic phenomenon of nonlinear dynamical system. One is a new Hamilton energy feedback control method based on Helmholtz’s theorem, which reduces the Lyapunov exponents value of the system by adjusting the feedback gain for controlling chaos. The other is to control the chaos of the system by using delayed feedback control method. Based on this method, we consider the local asymptotic stability of the equilibrium point of the system, and give conditions for the existence of the Hopf bifurcation of the system and the stability domain of the delay parameters. By using the centre manifold theorem and the Poincare normal form method, specific formulas for determining the direction of Hopf bifurcation and the stability of the bifurcation periodic solutions are derived. Finally, the simulation results show that chaos can be controlled by choosing appropriate time-delay parameters.

本文提出了两种不同的控制方法,以有效控制非线性动力系统的混沌现象。一种是基于亥姆霍兹定理的新型汉密尔顿能量反馈控制方法,通过调整反馈增益来降低系统的李亚普诺夫指数值,从而达到控制混沌的目的。另一种是利用延迟反馈控制方法来控制系统的混沌。基于这种方法,我们考虑了系统平衡点的局部渐近稳定性,给出了系统霍普夫分岔的存在条件和延迟参数的稳定域。利用中心流形定理和Poincare法线形式方法,得出了确定霍普夫分岔方向和分岔周期解稳定性的具体公式。最后,模拟结果表明,可以通过选择适当的时间延迟参数来控制混沌。
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引用次数: 0
Gravastars in the Lyra geometry 天琴座几何中的引力星
IF 1.9 4区 物理与天体物理 Q2 PHYSICS, MULTIDISCIPLINARY Pub Date : 2024-09-11 DOI: 10.1007/s12043-024-02815-1
A T Shafeek, M A Bakry, G M Moatimid

This paper explores the evolution of gravastars within the context of the Lyra geometry. The mathematical formulations of the three regions of a gravastar: (i) the inside region, (ii) the shell region and (iii) the external void region are described separately, along with their physical characteristics and graphical representations. The study explores different aspects of our model by analysing the behaviour of physical parameters. It solves the modified Einstein’s field equations, which are derived from this geometry, under the conditions of gravastar formation. The investigation focusses on the physical properties of the shell region, such as energy density, proper length, full energy, entropy, surface tension, thinness and energy conditions. Additionally, the stability of the gravastar model is examined by analysing the surface red-shift in relation to the shell length.

本文以天琴座几何为背景,探讨了引力星的演变。本文分别描述了引力星三个区域:(i) 内部区域、(ii) 外壳区域和 (iii) 外部空隙区域的数学公式,以及它们的物理特征和图形表示。研究通过分析物理参数的行为,探索了模型的不同方面。它求解了重力星形成条件下的修正爱因斯坦场方程,该方程是根据这种几何形状推导出来的。研究的重点是壳区的物理特性,如能量密度、适当长度、全能量、熵、表面张力、薄度和能量条件。此外,通过分析表面红移与壳长度的关系,研究了引力星模型的稳定性。
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引用次数: 0
On universality of clustering in natural evolution of particle systems: taking human languages as an example 论粒子系统自然进化中聚类的普遍性:以人类语言为例
IF 1.9 4区 物理与天体物理 Q2 PHYSICS, MULTIDISCIPLINARY Pub Date : 2024-09-11 DOI: 10.1007/s12043-024-02822-2
Yu Zhang, Chen Diao, Ning Cai

Computer model has been extensively adopted to overcome the time limitation of language evolution by transforming language theory into physical modelling mechanism, which helps to explore the general laws of evolution. In this paper, a model is designed to simulate the evolution process of languages in human settlements, with the associated network topology being lattice. The language of each node in the lattice will evolve gradually under the influence of its own fixed evolutionary direction and neighbours. According to the computational experiment results, it is discovered that the state points of languages always converge into several clusters during the evolution process, which gives us an insight into language evolution.

计算机模型通过将语言理论转化为物理建模机制,克服了语言进化的时间限制,有助于探索语言进化的一般规律,已被广泛采用。本文设计了一个模拟人类聚居区语言演变过程的模型,相关网络拓扑结构为网格。网格中每个节点的语言都会在自身固定的进化方向和相邻节点的影响下逐渐进化。根据计算实验结果,我们发现语言的状态点在进化过程中总是汇聚成若干个群,这给我们提供了语言进化的启示。
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引用次数: 0
Analysis, microcontroller implementation and chaos control of non-smooth air-gap permanent magnet synchronous motor 非平滑气隙永磁同步电机的分析、微控制器实现和混沌控制
IF 1.9 4区 物理与天体物理 Q2 PHYSICS, MULTIDISCIPLINARY Pub Date : 2024-09-11 DOI: 10.1007/s12043-024-02799-y
Giles Yamdjeu, Balakrishnan Sriram, Sifeu Takougang Kingni, Karthikeyan Rajagopal, Alidou Mohamadou

This article presents an analysis and control approach for a non-smooth air-gap permanent magnet synchronous motor (NSAG-PMSM) in the absence of external disturbances. The analytical study of NSAG-PMSM shows the existence of equilibrium points. Based on the Routh–Hurwitz criterion, the stability of the equilibrium points reveals the existence of transcritical bifurcation. NSAG-PMSM exhibits various dynamical behaviours, such as bistable chaos, periodic spiking oscillations, chaotic spiking characteristics, coexistence between periodic and chaotic behaviours and periodic evolution towards monostable chaos as system parameters change. The research uses microcontroller implementation to validate the dynamical characteristics observed during the numerical simulations of the NSAG-PMSM. The study of NSAG-PMSM proposes a strategy to mitigate chaos and stabilise the system using two simple controllers, with a comparative study presented using peak overshoot and settling time diagrams. By combining these different aspects, this article significantly contributes to the understanding of the operation in NSAG-PMSM, highlighting specific aspects related to the application of microcontroller techniques in the field of electrical engineering and solutions to chaos control.

本文介绍了在无外部干扰情况下,非平滑气隙永磁同步电机(NSAG-PMSM)的分析和控制方法。对 NSAG-PMSM 的分析研究表明存在平衡点。基于 Routh-Hurwitz 准则,平衡点的稳定性揭示了跨临界分岔的存在。NSAG-PMSM 表现出多种动力学行为,如双稳态混沌、周期性尖峰振荡、混沌尖峰特性、周期性和混沌行为共存,以及随着系统参数变化向单稳态混沌的周期性演变。该研究使用微控制器来验证在 NSAG-PMSM 数值模拟中观察到的动态特性。对 NSAG-PMSM 的研究提出了使用两个简单控制器缓解混乱和稳定系统的策略,并使用峰值过冲和稳定时间图进行了比较研究。通过将这些不同方面结合起来,本文极大地促进了对 NSAG-PMSM 运行的理解,突出了与微控制器技术在电气工程领域的应用和混沌控制解决方案相关的具体方面。
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引用次数: 0
Soliton solutions of the TWPA-SNAIL transmission line circuit equation under continuum approximation via the Jacobi elliptic function expansion method 通过雅可比椭圆函数展开法求解连续近似条件下的 TWPA-SNAIL 传输线电路方程的孤子解
IF 1.9 4区 物理与天体物理 Q2 PHYSICS, MULTIDISCIPLINARY Pub Date : 2024-08-28 DOI: 10.1007/s12043-024-02791-6
Bo Liu, Zhou-Bo Duan, Li-Fang Niu

In this paper, we study the travelling wave parametric amplifier-superconducting nonlinear asymmetric inductive element (TWPA-SNAIL) transmission line circuit equation and its variable coefficients form, which may describe transmission line circuits for travelling wave parametric amplifiers including superconducting nonlinear asymmetric inductive elements. We derive some exact solutions, including dark soliton, bright soliton, periodic, trigonometric function and hyperbolic function solutions using Jacobi elliptic function expansion method. The soliton solutions of this circuit equation are useful to analogue black–white hole event horizon pairs. To better describe the dynamical behaviour of these solutions, we plot three-dimensional density and two-dimensional images. By varying the parameters, we find that some parameters have an effect on the structure of the solution. In addition, for the variable coefficient equations, we present images containing trigonometric and exponential functions in the solution and obtain some satisfactory results by comparing the graphs with the coefficient functions. The results show that the Jacobi elliptic function expansion method is a remarkable, direct and desirable method for solving a class of nonlinear partial differential equations.

本文研究了行波参数放大器-超导非线性非对称电感元件(TWPA-SNAIL)传输线电路方程及其可变系数形式,它可以描述包括超导非线性非对称电感元件在内的行波参数放大器的传输线电路。我们利用雅可比椭圆函数展开法推导出一些精确解,包括暗孤子解、亮孤子解、周期解、三角函数解和双曲函数解。该电路方程的孤子解有助于模拟黑白洞事件视界对。为了更好地描述这些解的动力学行为,我们绘制了三维密度和二维图像。通过改变参数,我们发现一些参数对解的结构有影响。此外,对于可变系数方程,我们给出了解中包含三角函数和指数函数的图像,并通过比较图形和系数函数获得了一些令人满意的结果。结果表明,雅可比椭圆函数展开法是求解一类非线性偏微分方程的显著、直接和理想的方法。
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引用次数: 0
Numerical analysis on theoretical model of magneto-Williamson nanofluid in relation to viscous dissipation, double-diffusion convection, thermal radiation and multiple slip boundaries 与粘性耗散、双扩散对流、热辐射和多滑移边界有关的磁-威廉森纳米流体理论模型的数值分析
IF 1.9 4区 物理与天体物理 Q2 PHYSICS, MULTIDISCIPLINARY Pub Date : 2024-08-28 DOI: 10.1007/s12043-024-02798-z
S Bilal, Safia Akram, Maria Athar, Khalid Saeed, Alia Razia, Arshad Riaz

Aerospace research is increasingly focusing on propulsion system analysis. Heat transmission at high temperatures controlled by thermal radiation is used in spaceship propulsion systems. Hence, the current work investigates the magneto-Williamson nanofluid peristalsis flow in relation to thermal effect and slip-boundary circumstances with double-diffusion convection. In the flow's opposite direction, a steady, static magnetic field is applied. A mathematical model with appropriate boundary conditions is built by considering the momentum, continuity and energy equations. By considering the long wavelength and low Reynold estimation, the resulting equations are further made simpler. Then a numerical solution to the resulting reduced partial differential equations is obtained. Finally, there is a visual representation of the non-Newtonian propelling flow parameters, which include the Brinkman number, Prandtl number, Hartmann number, radiation parameter, particle volume fraction, electric field and slip parameters. It is highlighted that enhancing the coefficient of thermophoresis strengthens the temperature contour because increasing the number of particles merged enhances thermophoretic power. Furthermore, because of the substantial migration of nanoparticles from a heated region to a cooled one, the distribution of concentration becomes less cumbersome. It is also revealed that the fraction of nanoparticles rises because of rising thermal radiation and Brownian motion because nanofluids have a significant temperature distribution that may affect the system's distribution.

航空航天研究越来越注重推进系统分析。热辐射控制的高温热传导被用于飞船推进系统。因此,目前的工作研究了磁-威廉森纳米流体蠕动流动与热效应和滑移边界情况的关系,以及双扩散对流。在流动的反方向,施加了一个稳定的静态磁场。通过考虑动量、连续性和能量方程,建立了一个具有适当边界条件的数学模型。通过考虑长波长和低雷诺估计值,进一步简化了所得到的方程。然后对简化后的偏微分方程进行数值求解。最后,对非牛顿推进流参数进行了直观表示,其中包括布林克曼数、普朗特数、哈特曼数、辐射参数、粒子体积分数、电场和滑移参数。结果表明,提高热泳系数可增强温度等值线,因为增加合并颗粒的数量可增强热泳力。此外,由于纳米粒子从加热区域向冷却区域大量迁移,浓度分布变得不那么复杂。研究还发现,由于热辐射和布朗运动的增加,纳米粒子的比例也会上升,因为纳米流体具有显著的温度分布,可能会影响系统的分布。
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引用次数: 0
Advanced deep learning approach with physics-informed neural networks for analysing the thermal variation through a radial fin applicable in heat exchangers 利用物理信息神经网络的高级深度学习方法,分析适用于热交换器的径向翅片的热变化
IF 1.9 4区 物理与天体物理 Q2 PHYSICS, MULTIDISCIPLINARY Pub Date : 2024-08-27 DOI: 10.1007/s12043-024-02823-1
K Chandan, R S Varun Kumar, Naman Sharma, K Karthik, K V Nagaraja, Taseer Muhammad, Jasgurpreet Singh Chohan

The radiation impact on the thermal distribution of the radial fin with the temperature-dependent thermal conductivity is discussed in this paper. The basic governing heat equation of the radial fin is formulated with the assistance of the Fourier law of heat conduction. The dimensional heat equation of the radial fin is non-dimensionalised utilising appropriate dimensionless variables and this ordinary differential equation (ODE) is tackled by employing the physics-informed neural network (PINN) scheme. The thermal attributes of the radial fin are investigated for different parameters like convection–conduction parameter, radiation–conduction parameter and thermal conductivity parameter. The outcomes of the systematic assessments of these parameters are demonstrated with the support of graphs. The rise in the thermal conductivity variable promotes thermal variation in the fin. A decrease in radiative–conductive variable scales augments the temperature dispersal through the fin. Furthermore, PINN incorporates physics equations directly into its architecture, unlike standard numerical approaches, which frequently require extensive mathematical expertise for accuracy. This approach enables PINN to give precise findings even when working with minimal training data, saving substantial time and resources.

本文讨论了辐射对热导率随温度变化的径向翅片热分布的影响。在傅立叶热传导定律的帮助下,制定了径向翅片的基本热方程。利用适当的无量纲变量对径向鳍片的量纲热方程进行了无量纲化,并采用物理信息神经网络(PINN)方案来处理这个常微分方程(ODE)。针对对流传导参数、辐射传导参数和热传导参数等不同参数,对径向鳍片的热属性进行了研究。通过图表展示了对这些参数进行系统评估的结果。热导率变量的上升促进了翅片的热变化。辐射导率变量的减小则会增加鳍片的温度分布。此外,PINN 还将物理方程直接纳入其架构中,这与标准数值方法不同,后者通常需要大量数学专业知识才能保证准确性。这种方法使 PINN 即使在使用最少的训练数据时也能得出精确的结果,从而节省了大量的时间和资源。
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引用次数: 0
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