IF 2.8 4区物理与天体物理

Pramana Pub Date : 2023-07-12 DOI: 10.1007/s12043-023-02582-5

Asha S Kotnurkar, Namrata Kallolikar, Esraa N Thabet

{"title":"Double-diffusive bioconvection effects on multi-slip peristaltic flow of Jeffrey nanofluid in an asymmetric channel","authors":"Asha S Kotnurkar, Namrata Kallolikar, Esraa N Thabet","doi":"10.1007/s12043-023-02582-5","DOIUrl":"10.1007/s12043-023-02582-5","url":null,"abstract":"<div><p>Due to the numerous uses of nanofluids in industry and nanotechnology, scientists and engineers have given special attention to the subject of nanofluid mechanics. In the realm of fluid mechanics, it is a considerably more interesting research topic. Motivated by its useful applications in the rheological modelling of many important liquids, we seek to demonstrate the Jeffrey nanofluid model. The intention is to show the effects of multi-slip boundary condition of peristaltic flow in an asymmetric channel in the presence of viscous dissipation and bioconvection. Double diffusive convective flow is saturated with Jeffrey nanofluid containing gyrotatic micro-organism. The dimensional governing equations are converted into non-dimensional forms by suitable dimensionless parameters. The analytical method has been used to obtain solutions for the non-dimensionless system. The impact of different physical characteristics on velocity, temperature, concentration, volume fraction and trapping phenomenon has been analysed through graphs. From the study, it is observed that the velocity slip parameter increases the velocity profile, whereas the velocity profile decreases in the case of bioconvection Rayleigh number, double-diffusive and nanofluid buoyancy ratio, and it is also noticed that the density of the motile micro-organism is lowered by the Peclet number and for bioconvection constant. The present study is useful in academic research, biomedicine and theoretical studies of hemodynamics, and also micro-organisms that are favourable in maintaining the ecosystem and human health. In a few cases, the current analysis shows a substantial agreement with previously published results.</p></div>","PeriodicalId":743,"journal":{"name":"Pramana","volume":"97 3","pages":""},"PeriodicalIF":2.8,"publicationDate":"2023-07-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://link.springer.com/content/pdf/10.1007/s12043-023-02582-5.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"4495367","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 1

Effects of three-nucleon forces in the (d(alpha ,gamma ){^6})Li reaction 三核子力对(d(alpha ,gamma ){^6}) Li反应的影响

IF 2.8 4区物理与天体物理

Pramana Pub Date : 2023-07-12 DOI: 10.1007/s12043-023-02588-z

S Nahidinezhad, H Sadeghi

引用次数: 0

A toy model for low-energy nuclear fusion 一个低能核聚变的玩具模型

IF 2.8 4区物理与天体物理

Pramana Pub Date : 2023-07-12 DOI: 10.1007/s12043-023-02587-0

K Ramkumar, Harishyam Kumar, Pankaj Jain

引用次数: 1

Novel dispersive soliton solutions to a fractional nonlinear Schrödinger equation related with ultrashort pulses 与超短脉冲相关的分数阶非线性Schrödinger方程的新色散孤子解

IF 2.8 4区物理与天体物理

Pramana Pub Date : 2023-07-12 DOI: 10.1007/s12043-023-02573-6

Nursena Günhan Ay, Emrullah Yaşar

引用次数: 0

The deformed modified Korteweg–de Vries equation: Multi-soliton solutions and their interactions 变形修正Korteweg-de Vries方程:多孤子解及其相互作用

IF 2.8 4区物理与天体物理

Pramana Pub Date : 2023-07-12 DOI: 10.1007/s12043-023-02581-6

S Suresh Kumar

引用次数: 0

Dynamics analysis and fractional-order nonlinearity system via memristor-based Chua oscillator 基于忆阻器的蔡振荡器的分数阶非线性系统动力学分析

IF 2.8 4区物理与天体物理

Pramana Pub Date : 2023-07-12 DOI: 10.1007/s12043-023-02590-5

S Sabarathinam, Viktor Papov, Zi-Peng Wang, R Vadivel, NALLAPPAN Gunasekaran

{"title":"Dynamics analysis and fractional-order nonlinearity system via memristor-based Chua oscillator","authors":"S Sabarathinam, Viktor Papov, Zi-Peng Wang, R Vadivel, NALLAPPAN Gunasekaran","doi":"10.1007/s12043-023-02590-5","DOIUrl":"10.1007/s12043-023-02590-5","url":null,"abstract":"<div><p>This article discusses the utilisation of a Chua oscillator with a memristor to produce chaos with minimal nonlinearity. The memristor, a device that changes its flux or charges over time, has its nonlinear strength altered fractionally to determine the lowest-order memristor nonlinearity for generating chaos. An experimental analog circuit in real-time has been constructed. A linear parameter varying (LPV) approach, incorporating a suitable Lyapunov functional (LK) method, has been introduced to find new sufficient conditions for the robust stability of the resulting closed-loop system through linear matrix inequalities (LMIs). By observing the behaviour of the system without control, it is possible to understand the basic characteristics of chaotic oscillations and how they are affected by changes in the fractional order. These results can then be used as a starting point to study the effectiveness of various control techniques, such as feedback control, in reducing chaos and stabilising the system of this article. The efficiency of the cost-function-based control scheme is evaluated using the simulation results and relevant applications are addressed.\u0000</p></div>","PeriodicalId":743,"journal":{"name":"Pramana","volume":"97 3","pages":""},"PeriodicalIF":2.8,"publicationDate":"2023-07-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"4498612","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

Evolution of language driven by social dynamics 由社会动力驱动的语言进化

IF 2.8 4区物理与天体物理

Pramana Pub Date : 2023-07-10 DOI: 10.1007/s12043-023-02584-3

Moirangthem Shubhakanta Singh, R K Brojen Singh

{"title":"Evolution of language driven by social dynamics","authors":"Moirangthem Shubhakanta Singh, R K Brojen Singh","doi":"10.1007/s12043-023-02584-3","DOIUrl":"10.1007/s12043-023-02584-3","url":null,"abstract":"<div><p>The survival of endangered languages in complex language competition depends on the socio-cultural status and honour endowed (by itself and by the other) among them. The restriction in the endorsement of this honour leads to the extinction of one language and rise of the other. Endorsing proper mutual honour to each other triggers the co-existence of people speaking the two languages and this can save both languages from extinction. The loss of respect to each other leads to the death of both languages. We found a minimal or critical mutual honour <span>(u_c)</span> which protects the two languages from extinction. The increase in mutual honour from this minimal value allows an increase in the populations of the people who speak the two languages. The state of co-existence of competing languages abolishes the concept of minority and majority in language competition, which can be obtained by mutual honour. Further, excess of biased honour to a particular language (minority or majority) forces the language to extinct. In mean-field approximation of language competition, magnetisation parameter can be taken as an indicator of the survival of a language.\u0000</p></div>","PeriodicalId":743,"journal":{"name":"Pramana","volume":"97 3","pages":""},"PeriodicalIF":2.8,"publicationDate":"2023-07-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://link.springer.com/content/pdf/10.1007/s12043-023-02584-3.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"4423316","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 1

Symmetries of the one-dimensional hyperbolic Lagrangian mean curvature flow 一维双曲拉格朗日平均曲率流的对称性

IF 2.8 4区物理与天体物理

Pramana Pub Date : 2023-07-05 DOI: 10.1007/s12043-023-02578-1

Ben Gao, Liu Yang

引用次数: 0

DFT estimation of structural parameters and band gaps of III–V (GaP, AlP, InP, BP) and II–VI (BeX, MgX, CdX: X(=)O, S, Se, Te) semiconductors III-V型(GaP, AlP, InP, BP)和II-VI型(BeX, MgX, CdX: X (=) O, S, Se, Te)半导体结构参数和带隙的DFT估计

IF 2.8 4区物理与天体物理

Pramana Pub Date : 2023-07-05 DOI: 10.1007/s12043-023-02577-2

Sandeep Arora, Dharamvir Singh Ahlawat, Dharmbir Singh

{"title":"DFT estimation of structural parameters and band gaps of III–V (GaP, AlP, InP, BP) and II–VI (BeX, MgX, CdX: X(=)O, S, Se, Te) semiconductors","authors":"Sandeep Arora, Dharamvir Singh Ahlawat, Dharmbir Singh","doi":"10.1007/s12043-023-02577-2","DOIUrl":"10.1007/s12043-023-02577-2","url":null,"abstract":"<div><p>In density functional theory (DFT)-based computational methods, electronic properties at optimised atomic position and lattice constants are calculated for semiconducting materials belonging to III–V (GaP, AlP, InP, BP) and II–VI (BeX, MgX, CdX: X =O, S, Se, Te) groups. This paper reports the calculation of equilibrium lattice constants and bulk moduli of the materials under study using five different DFT functionals LDA, PBE, WC, PBEsol and SCAN. The results show that LDA underestimates while PBE overestimates the experimental lattice constants for all these semiconducting materials studied with a mean absolute relative error (%) of the order of 1%. Such trends in LDA and PBE results agree with the earlier reported work. The lattice constants calculated using WC, PBEsol and SCAN are in better agreement with the experiment compared to optB88vdW functional reported by others. On an average, WC and PBEsol functional have been found to be better in estimating the lattice constants and bulk modulus of II–VI binary compounds. We also present the band-gap calculations of the materials under study using different exchange-correlation functionals. The modified Becke–Johnson approximation suggested by Tran and Blaha is found to provide a better agreement with the experimentally reported results than the standard DFT method.</p></div>","PeriodicalId":743,"journal":{"name":"Pramana","volume":"97 3","pages":""},"PeriodicalIF":2.8,"publicationDate":"2023-07-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"4547399","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

Topological analysis and molecular modelling of liquid crystalline p-azoxyanisole and azobenzene compounds 液晶对氮氧苯甲醚和偶氮苯化合物的拓扑分析和分子模拟

IF 2.8 4区物理与天体物理

Pramana Pub Date : 2023-06-30 DOI: 10.1007/s12043-023-02568-3

P Srinivas, J Mahadev, K Hemalatha, M B Nandaprakash, R Somashekar

引用次数: 0

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