Annali dell''Universita di Ferrara最新文献_第9页

Applications of (mathcal {Q})curvature tensor and certain types of ricci-bourguignon soliton on different spacetimes (mathcal {Q})曲率张量和某些类型的里奇-布吉尼翁孤子在不同时空上的应用

Annali dell''Universita di Ferrara Pub Date : 2026-06-04 DOI: 10.1007/s11565-026-00700-w

Pawan Prajapati, Gyanvendra Pratap Singh, Santu Dey, Anand Kumar Mishra

引用次数: 0

Modeling of MHD triple-diffusive flow over a stretching/shrinking sheet embedded in a porous medium 多孔介质中拉伸/收缩薄片上MHD三扩散流动的建模

Annali dell''Universita di Ferrara Pub Date : 2026-06-04 DOI: 10.1007/s11565-026-00693-6

Sangamesh, K. R. Raghunatha, Ali J. Chamkha, S. Malashri

{"title":"Modeling of MHD triple-diffusive flow over a stretching/shrinking sheet embedded in a porous medium","authors":"Sangamesh, K. R. Raghunatha, Ali J. Chamkha, S. Malashri","doi":"10.1007/s11565-026-00693-6","DOIUrl":"10.1007/s11565-026-00693-6","url":null,"abstract":"<div>This study examines the dual-solution behavior of magnetohydrodynamic fluid flow induced by stretching and shrinking permeable surfaces embedded in a porous medium, with triple-diffusion effects. The governing equations, derived from the principles of momentum, energy, and species conservation, are transformed into a system of nonlinear ordinary differential equations using appropriate similarity transformations. Analytical solutions are obtained for the velocity field, while temperature and concentration distributions are expressed as Frobenius power series. The influence of key physical parameters including the magnetic parameter, Darcy parameter, suction/injection parameter, and shrinking/stretching parameter on the dimensionless velocity, temperature, and concentration profiles is investigated in detail. The effects of these parameters on engineering quantities such as the skin-friction coefficient, local Nusselt number, and Sherwood numbers are also examined. The results reveal dual solutions within a limited range of the shrinking parameter, due to the competition between the surface’s shrinking motion and viscous diffusion in the boundary layer. Stability analysis indicates that the first solution branch is stable and physically realizable, whereas the second branch is unstable. It is further observed that suction enhances boundary layer stability and enlarges the solution domain, while injection reduces it. Increasing the magnetic and Darcy parameters significantly modifies the momentum, heat, and mass transfer characteristics through the combined effects of Lorentz force and porous medium resistance. The results show excellent agreement with previously published studies, confirming the accuracy and reliability of this analysis. Overall, these findings provide valuable insights into the transport mechanisms of magnetohydrodynamic flows in porous media and may have applications in various engineering processes involving heat and mass transfer over permeable surfaces.</div>","PeriodicalId":35009,"journal":{"name":"Annali dell''Universita di Ferrara","volume":"72 3","pages":""},"PeriodicalIF":0.0,"publicationDate":"2026-06-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"148172466","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

Shape preserving properties of extended Jakimovski-Leviatan operators 扩展Jakimovski-Leviatan算子的保形性质

Annali dell''Universita di Ferrara Pub Date : 2026-06-04 DOI: 10.1007/s11565-026-00690-9

Pooja Gupta

引用次数: 0

On 2-color partitions with one color restricted to multiples of (5^k) 在两色分区上，一种颜色限制为的倍数 (5^k)

Annali dell''Universita di Ferrara Pub Date : 2026-06-04 DOI: 10.1007/s11565-026-00699-0

C. Shivashankar, B. Hemanthkumar, D. S. Gireesh

引用次数: 0

Developments of a generalized Skew (A, m)-symmetric operators 一类广义Skew (a, m)-对称算子的发展

Annali dell''Universita di Ferrara Pub Date : 2026-06-03 DOI: 10.1007/s11565-026-00686-5

Imene Djaber, Messaoud Guesba

引用次数: 0

Frobenius endomorphisms and minimal polynomials in supersingular isogeny rings 超奇异等构环中的Frobenius自同态和极小多项式

Annali dell''Universita di Ferrara Pub Date : 2026-06-03 DOI: 10.1007/s11565-026-00697-2

Mohammed El Baraka, Siham Ezzouak

引用次数: 0

Non-Coercive Elliptic Inclusion Problems with Dirichlet-Type Boundary Condition 具有dirichlet型边界条件的非强制椭圆包含问题

Annali dell''Universita di Ferrara Pub Date : 2026-06-03 DOI: 10.1007/s11565-026-00695-4

Morad Ouboufettal, Youssef Akdim

引用次数: 0

A class of operators related to skew [m, C]-symmetric operators 一类与斜[m， C]-对称算子相关的算子

Annali dell''Universita di Ferrara Pub Date : 2026-05-11 DOI: 10.1007/s11565-026-00682-9

Imene Djaber, Messaoud Guesba

{"title":"A class of operators related to skew [m, C]-symmetric operators","authors":"Imene Djaber, Messaoud Guesba","doi":"10.1007/s11565-026-00682-9","DOIUrl":"10.1007/s11565-026-00682-9","url":null,"abstract":"<div>In this paper, we introduce the class of n-quasi skew [m, C]-symmetric operator on a Hilbert space which is a generalization of skew [m, C] -symmetric operators presented by M. Chō, B. Načevska-Nastovska, and J. Tomiyama. [On skew [m, C]-symmetric operators. Adv. Oper.Theory 2(4), 468–474 (2017)]. An operator T (in ) ({mathscr {B}}({mathscr {H}})) is said to be n-quasi skew [m, C]-symmetric if <div><div>$$begin{aligned} T^{*n}left( underset{j=0}{overset{m}{sum }}left( {begin{array}{c}m jend{array}}right) CT^{m-j}CT^{j}right) T^{n}=0 end{aligned}$$</div></div>for some positive integers n and m. Some basic structural properties of this class are established with the help of operator matrix representation. In particular, we study the perturbation of an n-quasi skew [m, C]-symmetric operator with a nilpotent op- erator. Moreover, if T and S are doubly commuting such that T is (n_{1})-quasi skew [m, C]-symmetric symmetric and S is (n_{2})-quasi-(left[ k,Cright] )-symmetric operator, then TS is an (n_{3}=) max(left{ n_{1},n_{2}right} )-quasi skew (left[ m+k-1,C right] )-symmetric operator under suitable conditions.</div>","PeriodicalId":35009,"journal":{"name":"Annali dell''Universita di Ferrara","volume":"72 2","pages":""},"PeriodicalIF":0.0,"publicationDate":"2026-05-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"147937878","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

Dynamical sequential coupled FDEs mixed Caputo and Erdélyi-Kober operators via non-separated conditions 基于非分离条件的动态序列耦合FDEs混合Caputo算子和erdsamlyi - kober算子

Annali dell''Universita di Ferrara Pub Date : 2026-05-09 DOI: 10.1007/s11565-026-00680-x

Ayub Samadi, Mohammad Esmael Samei, Jessada Tariboon

引用次数: 0

Refined numerical radius estimates and Euclidean operator radius 改进的数值半径估计和欧几里得算子半径

Annali dell''Universita di Ferrara Pub Date : 2026-05-09 DOI: 10.1007/s11565-026-00691-8

Pintu Bhunia, Rukaya Majeed

引用次数: 0