IF 1.9 4区物理与天体物理

Pramana 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

{"title":"Computing intelligence for the magnetised chemically reactive bidirectional radiative nanofluid flow through the Bayesian regularisation back-propagated neural network","authors":"Zahoor Shah, Muhammad Asif Zahoor Raja, Muhammad Shoaib, Shumaila Javeed, Taseer Muhammad, Mehboob Ali, Waqar Azeem Khan, Raja Zaki Haider","doi":"10.1007/s12043-024-02794-3","DOIUrl":"10.1007/s12043-024-02794-3","url":null,"abstract":"<div><p>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 (<span>(M)</span>), bioconvection Lewis Number (<span>(L_{b})</span>), thermal diffusivity (<span>(alpha)</span>) and thermal Biot number (<span>(gamma)</span>). 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.</p></div>","PeriodicalId":743,"journal":{"name":"Pramana","volume":"98 4","pages":""},"PeriodicalIF":1.9,"publicationDate":"2024-09-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142413310","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"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 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

Pramana Pub Date : 2024-09-13 DOI: 10.1007/s12043-024-02744-z

Xia Wu, Xiaoling Qiu, Limi Hu

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

Pramana Pub Date : 2024-09-11 DOI: 10.1007/s12043-024-02815-1

A T Shafeek, M A Bakry, G M Moatimid

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

Pramana Pub Date : 2024-09-11 DOI: 10.1007/s12043-024-02822-2

Yu Zhang, Chen Diao, Ning Cai

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

Pramana Pub Date : 2024-09-11 DOI: 10.1007/s12043-024-02799-y

Giles Yamdjeu, Balakrishnan Sriram, Sifeu Takougang Kingni, Karthikeyan Rajagopal, Alidou Mohamadou

{"title":"Analysis, microcontroller implementation and chaos control of non-smooth air-gap permanent magnet synchronous motor","authors":"Giles Yamdjeu, Balakrishnan Sriram, Sifeu Takougang Kingni, Karthikeyan Rajagopal, Alidou Mohamadou","doi":"10.1007/s12043-024-02799-y","DOIUrl":"10.1007/s12043-024-02799-y","url":null,"abstract":"<div><p>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.\u0000</p></div>","PeriodicalId":743,"journal":{"name":"Pramana","volume":"98 4","pages":""},"PeriodicalIF":1.9,"publicationDate":"2024-09-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142204335","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"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

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

Pramana Pub Date : 2024-08-28 DOI: 10.1007/s12043-024-02791-6

Bo Liu, Zhou-Bo Duan, Li-Fang Niu

{"title":"Soliton solutions of the TWPA-SNAIL transmission line circuit equation under continuum approximation via the Jacobi elliptic function expansion method","authors":"Bo Liu, Zhou-Bo Duan, Li-Fang Niu","doi":"10.1007/s12043-024-02791-6","DOIUrl":"10.1007/s12043-024-02791-6","url":null,"abstract":"<div><p>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.</p></div>","PeriodicalId":743,"journal":{"name":"Pramana","volume":"98 3","pages":""},"PeriodicalIF":1.9,"publicationDate":"2024-08-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142204338","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"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

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

Pramana Pub Date : 2024-08-28 DOI: 10.1007/s12043-024-02798-z

S Bilal, Safia Akram, Maria Athar, Khalid Saeed, Alia Razia, Arshad Riaz

{"title":"Numerical analysis on theoretical model of magneto-Williamson nanofluid in relation to viscous dissipation, double-diffusion convection, thermal radiation and multiple slip boundaries","authors":"S Bilal, Safia Akram, Maria Athar, Khalid Saeed, Alia Razia, Arshad Riaz","doi":"10.1007/s12043-024-02798-z","DOIUrl":"10.1007/s12043-024-02798-z","url":null,"abstract":"<div><p>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.</p></div>","PeriodicalId":743,"journal":{"name":"Pramana","volume":"98 3","pages":""},"PeriodicalIF":1.9,"publicationDate":"2024-08-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142204339","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"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

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

Pramana 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

{"title":"Advanced deep learning approach with physics-informed neural networks for analysing the thermal variation through a radial fin applicable in heat exchangers","authors":"K Chandan, R S Varun Kumar, Naman Sharma, K Karthik, K V Nagaraja, Taseer Muhammad, Jasgurpreet Singh Chohan","doi":"10.1007/s12043-024-02823-1","DOIUrl":"10.1007/s12043-024-02823-1","url":null,"abstract":"<div><p>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.</p></div>","PeriodicalId":743,"journal":{"name":"Pramana","volume":"98 3","pages":""},"PeriodicalIF":1.9,"publicationDate":"2024-08-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142204340","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"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

First-principle study of strontium intercalation in bilayer graphene 双层石墨烯中锶插层的第一原理研究

IF 1.9 4区物理与天体物理

Pramana Pub Date : 2024-08-23 DOI: 10.1007/s12043-024-02759-6

O Farkad, R Takassa, F Elfatouaki, S Hassine, A El mouncharih, O Choukri, A Ouahdani, E A Ibnouelghazi, D Abouelaoualim

{"title":"First-principle study of strontium intercalation in bilayer graphene","authors":"O Farkad, R Takassa, F Elfatouaki, S Hassine, A El mouncharih, O Choukri, A Ouahdani, E A Ibnouelghazi, D Abouelaoualim","doi":"10.1007/s12043-024-02759-6","DOIUrl":"10.1007/s12043-024-02759-6","url":null,"abstract":"<div><p>Modifying electrical and optical properties in two-carbon materials is essential for electronic devices, energy storage and biosensor applications. We report a comparative study of the effect of systematically intercalated strontium atoms in AA- and AB-stacked bilayer graphene (BG) in the framework of density functional theory (DFT). The electronic band structures, the total and partial electronic density of states and the dielectric function are studied. We show that the intercalation of atoms can influence both electronic properties. Our results show that the Dirac cones, a signature of graphene, are translated into the conduction band. This property may be useful in band-gap tuning applications of nanodevices. The optical properties were calculated parallel and perpendicular to the graphene sheet under polarised electric fields. The calculated optical properties show that the intercalation of Sr in the AA- and AB-stacked BGs promotes IR absorption. The findings provide a basis for developing graphene intercalary compounds, which can be used in optoelectronics to control the absorption of light wavelengths and specifically in biosensor applications.</p></div>","PeriodicalId":743,"journal":{"name":"Pramana","volume":"98 3","pages":""},"PeriodicalIF":1.9,"publicationDate":"2024-08-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142204395","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"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

Visualising the structure of liquid germanium dioxide under compression 液态二氧化锗压缩结构可视化

IF 1.9 4区物理与天体物理

Pramana Pub Date : 2024-08-23 DOI: 10.1007/s12043-024-02813-3

Nguyen Van Hong

引用次数: 0

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