Journal of Computational and Applied Mathematics最新文献_第5页

Auto-stabilized weak Galerkin finite element methods on polytopal meshes without convexity constraints

IF 2.1 2区数学

Journal of Computational and Applied Mathematics Pub Date : 2025-02-27 DOI: 10.1016/j.cam.2025.116572

Chunmei Wang

引用次数: 0

Non-reflecting boundary conditions for solving Maxwell’s equations in waveguides

IF 2.1 2区数学

Journal of Computational and Applied Mathematics Pub Date : 2025-02-26 DOI: 10.1016/j.cam.2025.116598

Denise Aregba-Driollet , Patrick Lacoste , Corentin Prigent

引用次数: 0

Effects of higher order discretization on the predictions of steady turbulent airflow in human respiratory system

IF 2.1 2区数学

Journal of Computational and Applied Mathematics Pub Date : 2025-02-26 DOI: 10.1016/j.cam.2025.116593

A. Lancmanová, T. Bodnár

{"title":"Effects of higher order discretization on the predictions of steady turbulent airflow in human respiratory system","authors":"A. Lancmanová, T. Bodnár","doi":"10.1016/j.cam.2025.116593","DOIUrl":"10.1016/j.cam.2025.116593","url":null,"abstract":"<div><div>This study aims to evaluate the efficiency and accuracy of two distinct numerical schemes, the first order upwind scheme and the second-order central scheme with Van Leer limiter for convective terms, in predicting steady turbulent airflow in human airways for different flow rates ( <span><math><mrow><mi>Q</mi><mo>=</mo><mn>15</mn><mo>,</mo><mn>30</mn><mo>,</mo><mn>60</mn><mspace></mspace><mrow><mo>[</mo><mstyle><mi>ℓ</mi></mstyle><mspace></mspace><msup><mrow><mstyle><mi>m</mi><mi>i</mi><mi>n</mi></mstyle></mrow><mrow><mo>−</mo><mn>1</mn></mrow></msup><mo>]</mo></mrow></mrow></math></span> ). A 3D model of the human respiratory system, extending from the oral cavity to the trachea and incorporating a simplified lung model (with branches from the 4th to 7th generations merged into larger funnels), is used to simulate steady inhalation and exhalation, excluding nasal tract respiration.</div><div>Through a series of simulations and subsequent analysis of the results, this study mutually compares the performance of the two numerical schemes in terms of their assumed accuracy, convergence, and computational efficiency with reference to available experimental data.</div><div>This study has shown significant differences in numerical predictions of respiratory flows obtained by first and second order schemes, pointing out that the second order approximation not only offers a potentially more accurate results, but also lower computational cost.</div></div>","PeriodicalId":50226,"journal":{"name":"Journal of Computational and Applied Mathematics","volume":"466 ","pages":"Article 116593"},"PeriodicalIF":2.1,"publicationDate":"2025-02-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143527178","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"数学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

A symmetric ADMM-type algorithm for robust tensor completion problems using a regularized SCAD-Schatten-p model with application in color image and video recovery

IF 2.1 2区数学

Journal of Computational and Applied Mathematics Pub Date : 2025-02-25 DOI: 10.1016/j.cam.2025.116604

Zhechen Zhang , Sanyang Liu , Lixia Liu , Zhiping Lin

引用次数: 0

Fractional multiplicative Newton-type inequalities for multiplicative s-convex positive functions with application

IF 2.1 2区数学

Journal of Computational and Applied Mathematics Pub Date : 2025-02-25 DOI: 10.1016/j.cam.2025.116600

Abdelghani Lakhdari , Djaber Chemseddine Benchettah , Badreddine Meftah

引用次数: 0

Boundary value problems modeling moisture transport in soils

IF 2.1 2区数学

Journal of Computational and Applied Mathematics Pub Date : 2025-02-25 DOI: 10.1016/j.cam.2025.116597

Vasyl Marynets , Kateryna Marynets , Oksana Kohutych

引用次数: 0

A library in CoCoA for implementing railway interlocking systems

IF 2.1 2区数学

Journal of Computational and Applied Mathematics Pub Date : 2025-02-24 DOI: 10.1016/j.cam.2025.116594

Antonio Hernando , José Luis Galán–García , Yolanda Padilla–Domínguez , María Ángeles Galán–García , Gabriel Aguilera–Venegas

{"title":"A library in CoCoA for implementing railway interlocking systems","authors":"Antonio Hernando , José Luis Galán–García , Yolanda Padilla–Domínguez , María Ángeles Galán–García , Gabriel Aguilera–Venegas","doi":"10.1016/j.cam.2025.116594","DOIUrl":"10.1016/j.cam.2025.116594","url":null,"abstract":"<div><div>In this paper, we propose a user-friendly library in CoCoA to address and completely resolve the challenges posed by the highly efficient and intriguing mathematical model introduced in Hernando et al., (2023) for implementing railway interlocking systems. Although the algebraic model (Hernando et al., 2023) allows for fast performance, it requires implementers and users to have a high level of mathematical knowledge, mastering concepts such as Gröbner bases, ideals, rings, and polynomials. This expertise is necessary to manually define ideals generated by numerous complex polynomials in multiple variables, which depend on the railway station’s topology, a process that can be both tedious and error-prone. To completely resolve these challenges, we have developed a CoCoA library that streamlines the implementation of interlocking systems using our mathematical framework, effectively eliminating manual errors. Consequently, thanks to the library we have developed and presented here, even users without mathematical knowledge can easily implement and manage a railway interlocking system.</div></div>","PeriodicalId":50226,"journal":{"name":"Journal of Computational and Applied Mathematics","volume":"466 ","pages":"Article 116594"},"PeriodicalIF":2.1,"publicationDate":"2025-02-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143519491","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"数学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Testing and estimation of the index of stability of univariate and bivariate symmetric α-stable distributions via modified Greenwood statistic

IF 2.1 2区数学

Journal of Computational and Applied Mathematics Pub Date : 2025-02-24 DOI: 10.1016/j.cam.2025.116587

Katarzyna Skowronek , Marek Arendarczyk , Anna K. Panorska , Tomasz J. Kozubowski , Agnieszka Wyłomańska

{"title":"Testing and estimation of the index of stability of univariate and bivariate symmetric α-stable distributions via modified Greenwood statistic","authors":"Katarzyna Skowronek , Marek Arendarczyk , Anna K. Panorska , Tomasz J. Kozubowski , Agnieszka Wyłomańska","doi":"10.1016/j.cam.2025.116587","DOIUrl":"10.1016/j.cam.2025.116587","url":null,"abstract":"<div><div>We propose a testing and estimation methodology for univariate and bivariate symmetric <span><math><mi>α</mi></math></span>-stable distributions using a modified version of the Greenwood statistic. Originally designed for positive-valued random variables, the Greenwood statistic, and its modified version tailored for symmetric distributions, have been predominantly applied to univariate random samples. In this paper, we extend the modified Greenwood statistic to a bivariate setting and examine its probabilistic properties within the class of <span><math><mi>α</mi></math></span>-stable distributions, with a focus on the sub-Gaussian case. Additionally, we introduce a novel testing approach that considers two variations of the modified Greenwood statistic as test statistics for the bivariate case. In the univariate setting, we adapt the proposed testing methodology for estimating the stability index. The simulation studies presented demonstrate that our proposed methodology outperforms classical approaches previously used in this context and serves as an effective tool for distinguishing between Gaussian and <span><math><mi>α</mi></math></span>-stable distributions with a stability index close to 2. The theoretical and simulation results are further illustrated with practical data examples.</div></div>","PeriodicalId":50226,"journal":{"name":"Journal of Computational and Applied Mathematics","volume":"467 ","pages":"Article 116587"},"PeriodicalIF":2.1,"publicationDate":"2025-02-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143580624","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"数学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Graddiv-conforming spectral element method for fourth-order div problems

IF 2.1 2区数学

Journal of Computational and Applied Mathematics Pub Date : 2025-02-24 DOI: 10.1016/j.cam.2025.116599

Yang Han , Ping Lin , Lixiu Wang , Qian Zhang

引用次数: 0

Error estimates and parallel evaluation of hybrid schemes for parabolic, wave, and Schrödinger equations

IF 2.1 2区数学

Journal of Computational and Applied Mathematics Pub Date : 2025-02-24 DOI: 10.1016/j.cam.2025.116579

Wenzhuo Xiong , Xiujun Cheng , Qifeng Zhang

引用次数: 0