Annali dell''Universita di Ferrara最新文献_第6页

Pseudo-umbilical submanifolds of locally product Riemannian manifolds 局部积黎曼流形的伪脐子流形

Annali dell''Universita di Ferrara Pub Date : 2026-07-28 DOI: 10.1007/s11565-026-00717-1

Mehraj Ahmad Lone, Idrees Fayaz Harry, Mohamd Saleem Lone

引用次数: 0

Memory-induced nonlinear dynamics in a fractional human–mosquito malaria model with data-driven insights 记忆诱导的非线性动力学在分数人类-蚊子疟疾模型与数据驱动的见解

Annali dell''Universita di Ferrara Pub Date : 2026-07-25 DOI: 10.1007/s11565-026-00729-x

Aastha Ramoliya, Avani Solanki, Kunjan Shah

{"title":"Memory-induced nonlinear dynamics in a fractional human–mosquito malaria model with data-driven insights","authors":"Aastha Ramoliya, Avani Solanki, Kunjan Shah","doi":"10.1007/s11565-026-00729-x","DOIUrl":"10.1007/s11565-026-00729-x","url":null,"abstract":"<div>This study investigates the influence of non-local memory effects on the nonlinear dynamics of malaria transmission using a fractional-order human mosquito model formulated in the Atangana–Baleanu–Caputo (ABC) sense. The model incorporates a non-singular kernel to capture hereditary characteristics inherent in epidemiological processes, with the fractional order acting as a control parameter governing system dynamics. Analytical results establish positivity, boundedness, and the existence of unique solutions, while stability conditions for disease-free and endemic equilibria are derived. Although the classical threshold structure governed by the basic reproduction number is preserved, the inclusion of memory effects produces significant qualitative changes in transient behavior. Specifically, decreasing the fractional order delays epidemic peaks, reduces infection intensity, and yields smoother convergence toward equilibrium, indicating a memory-induced modulation of nonlinear dynamics. Model parameters are calibrated using malaria incidence data from (2000--2023), and numerical simulations confirm the robustness of these effects. The findings demonstrate that fractional dynamics fundamentally reshape transient epidemic evolution, providing new insight into memory-driven processes in complex biological systems and nonlinear epidemiological modeling.</div>","PeriodicalId":35009,"journal":{"name":"Annali dell''Universita di Ferrara","volume":"72 3","pages":""},"PeriodicalIF":0.0,"publicationDate":"2026-07-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"148614541","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

A study on a chaotic financial system with fractional-order dynamics and control 具有分数阶动态与控制的混沌金融系统研究

Annali dell''Universita di Ferrara Pub Date : 2026-07-21 DOI: 10.1007/s11565-026-00725-1

Lovely Borah, Kaushik Dehingia, Mohammed Almakki, Hemanta Kumar Sarmah, Kamyar Hosseini

引用次数: 0

On locally conformally flat almost gradient Ricci solitons 局部共形平坦几乎梯度里奇孤子

Annali dell''Universita di Ferrara Pub Date : 2026-07-20 DOI: 10.1007/s11565-026-00722-4

Ali H. Alkhaldi, Kamran Khan, Pooja Bansal, Akram Ali

引用次数: 0

Entire solutions of the second-order partial differential–difference trinomial functional equations in (mathbb {C}^2) 中的二阶偏微分-差分三叉泛函方程的全解 (mathbb {C}^2)

Annali dell''Universita di Ferrara Pub Date : 2026-07-17 DOI: 10.1007/s11565-026-00724-2

Tania Biswas, Sayantan Maity

引用次数: 0

Coincidence point results in extended rectangular (S_b)-suprametric spaces with applications 符合点结果在扩展矩形(S_b) -超度量空间与应用

Annali dell''Universita di Ferrara Pub Date : 2026-07-16 DOI: 10.1007/s11565-026-00721-5

G Sudhaamsh Mohan Reddy, Kastriot Zoto, Stojan Radenović

引用次数: 0

Significance of volumetric heating and convective boundary conditions on dusty ferrofluid convection in saturated porous media 饱和多孔介质中含尘铁磁流体对流体积加热和对流边界条件的意义

Annali dell''Universita di Ferrara Pub Date : 2026-07-13 DOI: 10.1007/s11565-026-00723-3

R. Suprabha, C. R. Mahesha, C. E. Nanjundappa

{"title":"Significance of volumetric heating and convective boundary conditions on dusty ferrofluid convection in saturated porous media","authors":"R. Suprabha, C. R. Mahesha, C. E. Nanjundappa","doi":"10.1007/s11565-026-00723-3","DOIUrl":"10.1007/s11565-026-00723-3","url":null,"abstract":"<div>In the present study, a combined theoretical and numerical investigation is carried out to examine the effect of dust particles on penetrative convection in ferromagnetic fluids with volumetric heating in a saturated porous medium. The porous layer is bounded by surfaces that may be either rigid or stress-free. The lower boundary is assumed to be thermally insulating, while the upper boundary satisfies a Robin-type thermal condition. The resulting eigenvalue problem is solved numerically using the Galerkin technique based on the weighted residual method (WRM), with either the gravity thermal Rayleigh number or the magnetic Rayleigh number taken as the eigenvalue parameter. The stability of the system is strongly influenced by internal heating in the porous layer. An increase in the Darcy number, heat source strength, nonlinearity of magnetization, dust particle parameter, and magnetic number accelerates the onset of thermomagnetic convection, whereas an increase in the Biot number, concentration parameter, and viscosity ratio delays its onset. The present results recover previously reported findings as special cases. These findings enhance understanding of thermal, magnetic, and particle interactions in ferrofluid-saturated porous media, with applications in magnetic cooling, energy systems, geophysical flows, and heat transfer.</div>","PeriodicalId":35009,"journal":{"name":"Annali dell''Universita di Ferrara","volume":"72 3","pages":""},"PeriodicalIF":0.0,"publicationDate":"2026-07-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"148465674","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Refinements of upper bounds for the norm and numerical radius for the sum of operators 算子和的范数和数值半径的上界的改进

Annali dell''Universita di Ferrara Pub Date : 2026-07-06 DOI: 10.1007/s11565-026-00718-0

Reza Rahimi, Rahmatollah Lashkaripour, Mojtaba Bakherad

引用次数: 0

Impulsive eco-epidemic prey refuge model with integrated pest management strategies 具有综合病虫害治理策略的脉冲生态流行病猎物避难所模型

Annali dell''Universita di Ferrara Pub Date : 2026-07-01 DOI: 10.1007/s11565-026-00715-3

Bhagwan Kumar, Ashok Kumar Sah, Shivani Khare, R. K. Gangele

{"title":"Impulsive eco-epidemic prey refuge model with integrated pest management strategies","authors":"Bhagwan Kumar, Ashok Kumar Sah, Shivani Khare, R. K. Gangele","doi":"10.1007/s11565-026-00715-3","DOIUrl":"10.1007/s11565-026-00715-3","url":null,"abstract":"<div>This study addresses the critical problem of pest infestations, which significantly impacts Indian agriculture and ecology, leading to substantial yearly expenses on pest control. We investigated Integrated Pest Management (IPM), a comprehensive strategy that combines various pest control techniques to decrease excessive pesticide usage and reduce environmental damage. Our research presents an eco-epidemic stage-structured model that incorporates prey refuge effects and impulsive control strategies. We propose a cost-effective solution that combines chemical pesticides, microbial control, and natural predators to protect crop yields. The pest population is divided into juvenile and mature stages, with adult pests further classified as susceptible or infected. Susceptible mature pests are considered the primary threat to crop production. Our analysis demonstrates the uniform ultimate boundedness of all system solutions. The study’s main findings focus on two key aspects. First, we established the conditions necessary for local and global asymptotic stability of a periodic solution involving juveniles and susceptible pests. This was achieved using Floquet’s theorem for impulsive differential equations, small-amplitude perturbation techniques, and the comparison theorem. Second, we determined the essential conditions for system permanence. Our results indicate that when the threshold condition is below 1, juvenile and susceptible pest populations face extinction. However, when the threshold condition exceeds 1, pests coexist with their natural enemies at a minimal level. These findings offer valuable theoretical insights into effective pest management, which we validated through numerical simulations.</div>","PeriodicalId":35009,"journal":{"name":"Annali dell''Universita di Ferrara","volume":"72 3","pages":""},"PeriodicalIF":0.0,"publicationDate":"2026-07-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"148380218","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Purely W-extending modules 纯w扩展模块

Annali dell''Universita di Ferrara Pub Date : 2026-07-01 DOI: 10.1007/s11565-026-00709-1

Muna Abbas Ahmed

{"title":"Purely W-extending modules","authors":"Muna Abbas Ahmed","doi":"10.1007/s11565-026-00709-1","DOIUrl":"10.1007/s11565-026-00709-1","url":null,"abstract":"The main purpose of this work is to offer an extension of the purely extending module by using the notions of the pure submodule and the weak essential submodule. This extension is named a purely W-extending module. Actually, purely extending module locates between extending and purely W-extending modules, the author verified by example that the purely W-extending is a proper extension of purely extending module. Several results that satisfied in extending modules are extended to this new kind of modules, for instance this work studied when the submodule of purely W-extending is purely W-extending, and discussed the direct sum of this kind of modules. In addition, another characterization of purely W-extending module was considered. Besides that, proper subclasses of the purely W-extending were investigated as well as purely extending such as Puw-semisimple and rationally extending modules. Moreover, the relationships of purely W-extending with some related modules were provided for instance, W-extending, semi-extending, purely rationally extending, monoform, almost monoform and purely monoform modules. Simply put, the location of Puw-extending with extending, W-extending and purely extending modules can be determined in the Figure below:","PeriodicalId":35009,"journal":{"name":"Annali dell''Universita di Ferrara","volume":"72 3","pages":""},"PeriodicalIF":0.0,"publicationDate":"2026-07-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"148380222","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0