Annali dell''Universita di Ferrara最新文献_第7页

Generalized Hermite polynomial sequences generated by integral powers of a first order differential–difference Dunkl operator 由一阶微分-差分Dunkl算子的积分幂生成的广义Hermite多项式序列

Annali dell''Universita di Ferrara Pub Date : 2026-06-30 DOI: 10.1007/s11565-026-00719-z

Mohamed Khalfallah

引用次数: 0

Octonion-Valued probability theory using the right-sided octonion fourier transform 利用右侧八数傅里叶变换的八数值概率论

Annali dell''Universita di Ferrara Pub Date : 2026-06-29 DOI: 10.1007/s11565-026-00714-4

N. Safouane, A. Achak, R. El Azar

引用次数: 0

Well-posedness and decay for a (upvarphi )-caputo time-fractional superdiffusion equation in Lorentz spaces 洛伦兹空间中(upvarphi ) -caputo时间分数超扩散方程的适定性和衰减

Annali dell''Universita di Ferrara Pub Date : 2026-06-29 DOI: 10.1007/s11565-026-00720-6

Brahim Benaissi, Yacine Arioua

引用次数: 0

Comparative numerical study of caputo time-fractional reaction–diffusion equations with applications in physical phenomena 卡普托时间分数反应扩散方程的数值比较研究及其在物理现象中的应用

Annali dell''Universita di Ferrara Pub Date : 2026-06-23 DOI: 10.1007/s11565-026-00706-4

Ahmed Hassan

引用次数: 0

Extended q-Jacobi polynomial and its properties 扩展q-Jacobi多项式及其性质

Annali dell''Universita di Ferrara Pub Date : 2026-06-20 DOI: 10.1007/s11565-026-00713-5

S. B. Gajera, R. K. Jana, N. A. Khan, A. K. Shukla

引用次数: 0

Pointwise orbital proximal contractions and best proximity results in hyperconvex metric spaces 在超凸度量空间中，点向轨道近端收缩和最佳接近结果

Annali dell''Universita di Ferrara Pub Date : 2026-06-17 DOI: 10.1007/s11565-026-00707-3

Moosa Gabeleh, Jack Markin

{"title":"Pointwise orbital proximal contractions and best proximity results in hyperconvex metric spaces","authors":"Moosa Gabeleh, Jack Markin","doi":"10.1007/s11565-026-00707-3","DOIUrl":"10.1007/s11565-026-00707-3","url":null,"abstract":"<div><p>We introduce new classes of pointwise orbital contractions for mappings defined on pairs of subsets of metric spaces and investigate their best proximity properties in hyperconvex metric spaces. First, we define the notion of a pointwise orbital cyclic contraction and establish the existence of best proximity points for such mappings acting on admissible pairs of subsets of a hyperconvex metric space. As a consequence, a novel fixed point theorem is obtained for pointwise orbital contractions defined on a single admissible subset. We then study the noncyclic case by introducing pointwise orbital noncyclic contractions. Using minimal admissible invariant pairs and the concept of semi-sharp proximinality, we prove the existence of best proximity pairs for distance-preserving noncyclic mappings in hyperconvex setting. Furthermore, we show that in Banach spaces the semi-sharp proximinality of every convex pair characterizes strict convexity. Finally, motivated by asymptotic contraction techniques, we introduce the class of asymptotic proximal pointwise cyclic contractions and prove a best proximity point theorem under a suitable geometric notion, called property UC, for admissible pairs.</p></div>","PeriodicalId":35009,"journal":{"name":"Annali dell''Universita di Ferrara","volume":"72 3","pages":""},"PeriodicalIF":0.0,"publicationDate":"2026-06-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"148281113","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 numerical study on mixed convective Newtonian nanofluid flow through a porous channel: Local thermal non-equilibrium approach 混合对流牛顿纳米流体通过多孔通道的数值研究：局部热非平衡方法

Annali dell''Universita di Ferrara Pub Date : 2026-06-16 DOI: 10.1007/s11565-026-00708-2

R. Snehashree, C Siddabasappa, B. Patil Mallikarjun

{"title":"A numerical study on mixed convective Newtonian nanofluid flow through a porous channel: Local thermal non-equilibrium approach","authors":"R. Snehashree, C Siddabasappa, B. Patil Mallikarjun","doi":"10.1007/s11565-026-00708-2","DOIUrl":"10.1007/s11565-026-00708-2","url":null,"abstract":"<div><p>This paper presents a numerical investigation of the influences of local thermal non-equilibrium (LTNE) and non-uniform heat source/sink on the convective flow of a Newtonian nanofluid through a vertical porous channel, using the shooting method. The analysis incorporates the Oberbeck-Boussinesq approximation, as well as the thermophoresis effect and Brownian motion effect, to capture the significant influence of nanofluids on flow dynamics and heat transfer characteristics. Plots and tables are used to analyze the impact of flow parameters on the heat transfer and mass transfer characteristics of the individual phases. The study focuses on clarifying how the fluid phase and the solid matrix thermal gradient affect the thermal transport, flow properties, and overall heat performance. Numerical techniques are employed to explore the enhanced thermal behavior of nanofluids and their interaction with porous media under LTNE conditions. The flow velocity variations are more significant with the thermophoretic and Brownian motion parameters, the internal heat source, and the inverse Darcy number than with the local thermal non-equilibrium parameters, such as the interphase heat-transfer coefficient and the thermal diffusivity ratio. The temperature profiles of the fluid and solid phases vary remarkably over an intermediate finite range of LTNE parameters, where LTNE is prominent. For large values of LTNE parameters (<span>(Hrightarrow infty ,gamma rightarrow infty )</span>), the LTNE effect ceases, and the temperature profiles of the individual phases become independent of these parameters and converge asymptotically towards local thermal equilibrium results. Remarkably, the influence of LTNE diminishes for large values of the interfacial heat transfer coefficient and the ratio of thermal diffusivities, as observed in convective instability problems.</p></div>","PeriodicalId":35009,"journal":{"name":"Annali dell''Universita di Ferrara","volume":"72 3","pages":""},"PeriodicalIF":0.0,"publicationDate":"2026-06-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"148281041","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

Asymptotic stability of swelling porous elastic systems with nonstandard nonlinear kelvin–voigt damping 非标准非线性kelvin - vot阻尼膨胀多孔弹性系统的渐近稳定性

Annali dell''Universita di Ferrara Pub Date : 2026-06-16 DOI: 10.1007/s11565-026-00674-9

Adel M. Al-Mahdi, Mohammad M. Al-Gharabli

引用次数: 0

Towards a function theory of complexified octonions 复化八元数的泛函理论

Annali dell''Universita di Ferrara Pub Date : 2026-06-12 DOI: 10.1007/s11565-026-00712-6

Rolf Sören Kraußhar, Heikki Orelma

{"title":"Towards a function theory of complexified octonions","authors":"Rolf Sören Kraußhar, Heikki Orelma","doi":"10.1007/s11565-026-00712-6","DOIUrl":"10.1007/s11565-026-00712-6","url":null,"abstract":"<div><p>In this article we study function theory in the 16-dimensional space of complexified octonions <span>(mathbb {O}_{mathbb {C}}=mathbb {C}otimes mathbb {O})</span>. We define the complexified octonionic Cauchy–Riemann operator </p><div><div><span>$$ D=sum _{j=0}^7 e_jpartial _{z_j} $$</span></div></div><p>where <span>(partial _{z_j}{:=}partial _{x_j}+ipartial _{y_j})</span> for <span>(j=0,1,...,7)</span>. This operator together with its octonionic conjugate factorize the ultrahyperbolic operator </p><div><div><span>$$ mathcal {L}=Doverline{D}=overline{D}D=sum _{j=0}^7 partial _{z_j}^2. $$</span></div></div><p>In real coordinates we obtain a Lichnerowicz-Weitzenböck type formula of the form </p><div><div><span>$$ mathcal {L} = Delta _x - Delta _y + 2i langle partial _x, partial _y rangle $$</span></div></div><p>One main goal of this paper consists in investigating the fundamental solution and polynomial solutions of the operator <span>(mathcal {L})</span>. The set of polynomial solutions is completely described by proposing explicit basis constructions and dimension formulae. Another main goal that is to carefully figure out in detail how complexified octonion analysis precisely differs from classical real octonion analysis in 8 dimensions. We explain some really substantial differences. In particular, the component functions are not Euclidean harmonic but ultrahyperbolic harmonic exhibiting a very different regularity behavior. Furthermore, the classical Fischer-decomposition is not anymore true in this context.</p></div>","PeriodicalId":35009,"journal":{"name":"Annali dell''Universita di Ferrara","volume":"72 3","pages":""},"PeriodicalIF":0.0,"publicationDate":"2026-06-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://link.springer.com/content/pdf/10.1007/s11565-026-00712-6.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"148237118","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Bounds for the zeros of a quaternionic polynomial 四元数多项式的零点边界

Annali dell''Universita di Ferrara Pub Date : 2026-06-12 DOI: 10.1007/s11565-026-00710-8

Ishfaq Ahmad Wani, Abdul Liman, Tanweer Jalal

引用次数: 0