Subjects -> MATHEMATICS (Total: 1118 journals)
    - APPLIED MATHEMATICS (92 journals)
    - GEOMETRY AND TOPOLOGY (23 journals)
    - MATHEMATICS (819 journals)
    - MATHEMATICS (GENERAL) (45 journals)
    - NUMERICAL ANALYSIS (26 journals)
    - PROBABILITIES AND MATH STATISTICS (113 journals)

MATHEMATICS (819 journals)                  1 2 3 4 5 | Last

Showing 1 - 200 of 538 Journals sorted alphabetically
Abakós     Open Access   (Followers: 5)
Abhandlungen aus dem Mathematischen Seminar der Universitat Hamburg     Hybrid Journal   (Followers: 3)
Accounting Perspectives     Full-text available via subscription   (Followers: 9)
ACM Transactions on Algorithms (TALG)     Hybrid Journal   (Followers: 17)
ACM Transactions on Computational Logic (TOCL)     Hybrid Journal   (Followers: 5)
ACM Transactions on Mathematical Software (TOMS)     Hybrid Journal   (Followers: 9)
ACS Applied Materials & Interfaces     Hybrid Journal   (Followers: 44)
Acta Applicandae Mathematicae     Hybrid Journal   (Followers: 2)
Acta Mathematica     Hybrid Journal   (Followers: 11)
Acta Mathematica Hungarica     Hybrid Journal   (Followers: 2)
Acta Mathematica Scientia     Full-text available via subscription   (Followers: 5)
Acta Mathematica Sinica, English Series     Hybrid Journal   (Followers: 6)
Acta Mathematica Vietnamica     Hybrid Journal  
Acta Mathematicae Applicatae Sinica, English Series     Hybrid Journal  
Advanced Science Letters     Full-text available via subscription   (Followers: 13)
Advances in Applied Clifford Algebras     Hybrid Journal   (Followers: 6)
Advances in Catalysis     Full-text available via subscription   (Followers: 8)
Advances in Complex Systems     Hybrid Journal   (Followers: 12)
Advances in Computational Mathematics     Hybrid Journal   (Followers: 23)
Advances in Decision Sciences     Open Access   (Followers: 4)
Advances in Difference Equations     Open Access   (Followers: 5)
Advances in Fixed Point Theory     Open Access   (Followers: 9)
Advances in Geosciences (ADGEO)     Open Access   (Followers: 22)
Advances in Linear Algebra & Matrix Theory     Open Access   (Followers: 10)
Advances in Materials Science     Open Access   (Followers: 22)
Advances in Mathematical Physics     Open Access   (Followers: 10)
Advances in Mathematics     Full-text available via subscription   (Followers: 22)
Advances in Numerical Analysis     Open Access   (Followers: 8)
Advances in Operations Research     Open Access   (Followers: 14)
Advances in Operator Theory     Hybrid Journal   (Followers: 4)
Advances in Porous Media     Full-text available via subscription   (Followers: 6)
Advances in Pure Mathematics     Open Access   (Followers: 11)
Advances in Science and Research (ASR)     Open Access   (Followers: 8)
Aequationes Mathematicae     Hybrid Journal   (Followers: 2)
African Journal of Educational Studies in Mathematics and Sciences     Full-text available via subscription   (Followers: 12)
African Journal of Mathematics and Computer Science Research     Open Access   (Followers: 7)
Afrika Matematika     Hybrid Journal   (Followers: 3)
Air, Soil & Water Research     Open Access   (Followers: 13)
AKSIOMA Journal of Mathematics Education     Open Access   (Followers: 4)
AKSIOMATIK : Jurnal Penelitian Pendidikan dan Pembelajaran Matematika     Open Access   (Followers: 1)
Al-Jabar : Jurnal Pendidikan Matematika     Open Access   (Followers: 1)
Al-Qadisiyah Journal for Computer Science and Mathematics     Open Access   (Followers: 1)
AL-Rafidain Journal of Computer Sciences and Mathematics     Open Access   (Followers: 6)
Algebra and Logic     Hybrid Journal   (Followers: 8)
Algebra Colloquium     Hybrid Journal   (Followers: 4)
Algebra Universalis     Hybrid Journal   (Followers: 2)
Algorithmic Operations Research     Open Access   (Followers: 5)
Algorithms     Open Access   (Followers: 14)
Algorithms Research     Open Access   (Followers: 2)
American Journal of Computational and Applied Mathematics     Open Access   (Followers: 10)
American Journal of Mathematical Analysis     Open Access   (Followers: 2)
American Journal of Mathematical and Management Sciences     Hybrid Journal   (Followers: 1)
American Journal of Mathematics     Full-text available via subscription   (Followers: 9)
American Journal of Operations Research     Open Access   (Followers: 8)
American Mathematical Monthly     Full-text available via subscription   (Followers: 7)
An International Journal of Optimization and Control: Theories & Applications     Open Access   (Followers: 13)
Analele Universitatii Ovidius Constanta - Seria Matematica     Open Access  
Analysis and Applications     Hybrid Journal   (Followers: 2)
Analysis and Mathematical Physics     Hybrid Journal   (Followers: 10)
Analysis Mathematica     Full-text available via subscription  
Anargya : Jurnal Ilmiah Pendidikan Matematika     Open Access   (Followers: 8)
Annales Mathematicae Silesianae     Open Access   (Followers: 2)
Annales mathématiques du Québec     Hybrid Journal   (Followers: 4)
Annales Universitatis Mariae Curie-Sklodowska, sectio A – Mathematica     Open Access   (Followers: 1)
Annales Universitatis Paedagogicae Cracoviensis. Studia Mathematica     Open Access  
Annali di Matematica Pura ed Applicata     Hybrid Journal   (Followers: 1)
Annals of Combinatorics     Hybrid Journal   (Followers: 3)
Annals of Data Science     Hybrid Journal   (Followers: 17)
Annals of Discrete Mathematics     Full-text available via subscription   (Followers: 8)
Annals of Functional Analysis     Hybrid Journal   (Followers: 4)
Annals of Mathematics     Full-text available via subscription   (Followers: 4)
Annals of Mathematics and Artificial Intelligence     Hybrid Journal   (Followers: 16)
Annals of PDE     Hybrid Journal  
Annals of Pure and Applied Logic     Open Access   (Followers: 6)
Annals of the Alexandru Ioan Cuza University - Mathematics     Open Access  
Annals of the Institute of Statistical Mathematics     Hybrid Journal   (Followers: 1)
Annals of West University of Timisoara - Mathematics     Open Access   (Followers: 1)
Annals of West University of Timisoara - Mathematics and Computer Science     Open Access   (Followers: 2)
Annuaire du Collège de France     Open Access   (Followers: 6)
ANZIAM Journal     Open Access   (Followers: 2)
Applicable Algebra in Engineering, Communication and Computing     Hybrid Journal   (Followers: 3)
Applications of Mathematics     Hybrid Journal   (Followers: 3)
Applied Categorical Structures     Hybrid Journal   (Followers: 4)
Applied Computational Intelligence and Soft Computing     Open Access   (Followers: 16)
Applied Mathematics     Open Access   (Followers: 10)
Applied Mathematics     Open Access   (Followers: 6)
Applied Mathematics & Optimization     Hybrid Journal   (Followers: 13)
Applied Mathematics - A Journal of Chinese Universities     Hybrid Journal   (Followers: 2)
Applied Mathematics and Nonlinear Sciences     Open Access   (Followers: 1)
Applied Mathematics Letters     Full-text available via subscription   (Followers: 3)
Applied Mathematics Research eXpress     Hybrid Journal   (Followers: 2)
Applied Network Science     Open Access   (Followers: 3)
Applied Numerical Mathematics     Hybrid Journal   (Followers: 6)
Applied Spatial Analysis and Policy     Hybrid Journal   (Followers: 6)
Arab Journal of Mathematical Sciences     Open Access   (Followers: 4)
Arabian Journal of Mathematics     Open Access   (Followers: 2)
Archive for Mathematical Logic     Hybrid Journal   (Followers: 4)
Archive of Applied Mechanics     Hybrid Journal   (Followers: 6)
Archive of Numerical Software     Open Access  
Archives of Computational Methods in Engineering     Hybrid Journal   (Followers: 6)
Arkiv för Matematik     Hybrid Journal   (Followers: 1)
Armenian Journal of Mathematics     Open Access   (Followers: 1)
Arnold Mathematical Journal     Hybrid Journal   (Followers: 1)
Artificial Satellites     Open Access   (Followers: 24)
Asia-Pacific Journal of Operational Research     Hybrid Journal   (Followers: 3)
Asian Journal of Algebra     Open Access   (Followers: 1)
Asian Research Journal of Mathematics     Open Access  
Asian-European Journal of Mathematics     Hybrid Journal   (Followers: 4)
Australian Mathematics Teacher, The     Full-text available via subscription   (Followers: 7)
Australian Primary Mathematics Classroom     Full-text available via subscription   (Followers: 7)
Australian Senior Mathematics Journal     Full-text available via subscription   (Followers: 2)
Automatic Documentation and Mathematical Linguistics     Hybrid Journal   (Followers: 5)
Axioms     Open Access   (Followers: 1)
Baltic International Yearbook of Cognition, Logic and Communication     Open Access   (Followers: 2)
Banach Journal of Mathematical Analysis     Hybrid Journal   (Followers: 1)
Basin Research     Hybrid Journal   (Followers: 6)
BIBECHANA     Open Access   (Followers: 2)
Biomath     Open Access  
BIT Numerical Mathematics     Hybrid Journal   (Followers: 1)
Boletim Cearense de Educação e História da Matemática     Open Access  
Boletim de Educação Matemática     Open Access  
Boletín de la Sociedad Matemática Mexicana     Hybrid Journal  
Bollettino dell'Unione Matematica Italiana     Full-text available via subscription   (Followers: 3)
British Journal for the History of Mathematics     Hybrid Journal  
British Journal of Mathematical and Statistical Psychology     Full-text available via subscription   (Followers: 20)
Bruno Pini Mathematical Analysis Seminar     Open Access  
Buletinul Academiei de Stiinte a Republicii Moldova. Matematica     Open Access   (Followers: 14)
Bulletin des Sciences Mathamatiques     Full-text available via subscription   (Followers: 4)
Bulletin of Dnipropetrovsk University. Series : Communications in Mathematical Modeling and Differential Equations Theory     Open Access   (Followers: 3)
Bulletin of Mathematical Sciences     Open Access   (Followers: 1)
Bulletin of Symbolic Logic     Full-text available via subscription   (Followers: 3)
Bulletin of Taras Shevchenko National University of Kyiv. Series: Physics and Mathematics     Open Access  
Bulletin of the Australian Mathematical Society     Full-text available via subscription   (Followers: 2)
Bulletin of the Brazilian Mathematical Society, New Series     Hybrid Journal  
Bulletin of the Iranian Mathematical Society     Hybrid Journal  
Bulletin of the London Mathematical Society     Hybrid Journal   (Followers: 3)
Bulletin of the Malaysian Mathematical Sciences Society     Hybrid Journal  
Cadernos do IME : Série Matemática     Open Access   (Followers: 2)
Calculus of Variations and Partial Differential Equations     Hybrid Journal  
Canadian Journal of Mathematics / Journal canadien de mathématiques     Hybrid Journal  
Canadian Journal of Science, Mathematics and Technology Education     Hybrid Journal   (Followers: 23)
Canadian Mathematical Bulletin     Hybrid Journal  
Carpathian Mathematical Publications     Open Access   (Followers: 1)
Catalysis in Industry     Hybrid Journal   (Followers: 1)
CEAS Space Journal     Hybrid Journal   (Followers: 6)
CHANCE     Hybrid Journal   (Followers: 5)
Chaos, Solitons & Fractals     Hybrid Journal   (Followers: 3)
Chaos, Solitons & Fractals : X     Open Access   (Followers: 1)
ChemSusChem     Hybrid Journal   (Followers: 8)
Chinese Annals of Mathematics, Series B     Hybrid Journal  
Chinese Journal of Catalysis     Full-text available via subscription   (Followers: 3)
Chinese Journal of Mathematics     Open Access  
Ciencia     Open Access   (Followers: 1)
CODEE Journal     Open Access   (Followers: 2)
Cogent Mathematics     Open Access   (Followers: 2)
Cognitive Computation     Hybrid Journal   (Followers: 3)
Collectanea Mathematica     Hybrid Journal  
College Mathematics Journal     Hybrid Journal   (Followers: 4)
COMBINATORICA     Hybrid Journal  
Combinatorics, Probability and Computing     Hybrid Journal   (Followers: 4)
Combustion Theory and Modelling     Hybrid Journal   (Followers: 17)
Commentarii Mathematici Helvetici     Hybrid Journal  
Communications in Advanced Mathematical Sciences     Open Access  
Communications in Combinatorics and Optimization     Open Access  
Communications in Contemporary Mathematics     Hybrid Journal  
Communications in Mathematical Physics     Hybrid Journal   (Followers: 4)
Communications On Pure & Applied Mathematics     Hybrid Journal   (Followers: 5)
Complex Analysis and its Synergies     Open Access   (Followers: 3)
Complex Variables and Elliptic Equations: An International Journal     Hybrid Journal  
Composite Materials Series     Full-text available via subscription   (Followers: 11)
Compositio Mathematica     Full-text available via subscription  
Comptes Rendus : Mathematique     Open Access  
Computational and Applied Mathematics     Hybrid Journal   (Followers: 4)
Computational and Mathematical Methods     Hybrid Journal  
Computational and Mathematical Methods in Medicine     Open Access   (Followers: 3)
Computational and Mathematical Organization Theory     Hybrid Journal   (Followers: 1)
Computational Complexity     Hybrid Journal   (Followers: 4)
Computational Mathematics and Modeling     Hybrid Journal   (Followers: 9)
Computational Mechanics     Hybrid Journal   (Followers: 10)
Computational Methods and Function Theory     Hybrid Journal  
Computational Optimization and Applications     Hybrid Journal   (Followers: 11)
Computers & Mathematics with Applications     Full-text available via subscription   (Followers: 11)
Confluentes Mathematici     Hybrid Journal  
Constructive Mathematical Analysis     Open Access   (Followers: 1)
Contributions to Discrete Mathematics     Open Access   (Followers: 1)
Contributions to Game Theory and Management     Open Access  
COSMOS     Hybrid Journal   (Followers: 1)
Cryptography and Communications     Hybrid Journal   (Followers: 14)
Cuadernos de Investigación y Formación en Educación Matemática     Open Access  
Cubo. A Mathematical Journal     Open Access  
Current Research in Biostatistics     Open Access   (Followers: 8)
Czechoslovak Mathematical Journal     Hybrid Journal   (Followers: 1)
Daya Matematis : Jurnal Inovasi Pendidikan Matematika     Open Access   (Followers: 1)
Demographic Research     Open Access   (Followers: 16)
Design Journal : An International Journal for All Aspects of Design     Hybrid Journal   (Followers: 35)
Desimal : Jurnal Matematika     Open Access   (Followers: 3)
Developments in Clay Science     Full-text available via subscription   (Followers: 1)
Developments in Mineral Processing     Full-text available via subscription   (Followers: 3)
Dhaka University Journal of Science     Open Access  
Differential Equations and Dynamical Systems     Hybrid Journal   (Followers: 4)

        1 2 3 4 5 | Last

Similar Journals
Journal Cover
Computational and Applied Mathematics
Journal Prestige (SJR): 0.272
Citation Impact (citeScore): 1
Number of Followers: 4  
 
  Hybrid Journal Hybrid journal (It can contain Open Access articles)
ISSN (Print) 0101-8205 - ISSN (Online) 1807-0302
Published by Springer-Verlag Homepage  [2658 journals]
  • The factorization method for inhomogeneous medium with an impenetrable
           obstacle

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      Abstract: This paper is concerned with the inverse scattering problem of time-harmonic acoustic waves by a mixed-type scatterer. Such a scatterer is given as the union of an inhomogeneous medium with unknown buried objects inside and an impenetrable obstacle. Having established the well-posedness of the direct problem by the variational method, we study the factorization method for recovering the support of the inhomogeneous medium and the shape of the impenetrable obstacle simultaneously. Finally, some numerical examples are presented to illustrate the feasibility and effectiveness of the inverse algorithm.
      PubDate: 2021-10-13
       
  • A collocation method based on localized radial basis functions with
           reproducibility for nonlocal diffusion models

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      Abstract: In this paper, a kind of localized radial basis function-based collocation method with reproducibility has been designed for nonlocal diffusion models. The basic idea of the method is to localize the RBF shape function by a corrected kernel with compact support, and meanwhile make the interpolation function to meet the reproducing conditions by modifying the coefficient contained in such kernel. Three types of nonlocal diffusion problems including constant and singular kernels are solved by our method in numerical experiments, which indicates that our method shows almost the same convergent behavior compared with RBF collocation methods, but it is much better conditioning and more time-efficient. It also overcomes the shortcoming that the RK-enhanced RBF method is not convergent for nonlocal diffusion models.
      PubDate: 2021-10-13
       
  • An DRCS preconditioning iterative method for a constrained fractional
           optimal control problem

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      Abstract: The optimal control problem constrained by a fractional diffusion equation arises in a great deal of applications. Fast and efficient numerical methods for solving such kinds of problems have attracted much attention in recent years. In this paper, we consider an optimal control problem constrained by a fractional diffusion equation (FDE). After the state and costate equations are derived, the closed form of the optimal control variable is then given. The decoupled gradient projection method is applied to solve the coupled system of the state and costate equations to obtain the solution of the optimal control problem. The second-order Crank-Nicolson method as well as the weighted and shifted Grünwald difference (CN-WSGD) methods are utilized to discretize these two equations. We get the discretized state and costate equations as systems of linear equations with both coefficient matrices having the structure of the sum of a diagonal and a Toeplitz matrix. A diagonal and a R.Chan’s circulant splitting (DRCS) preconditioner is developed and combined in the Krylov subspace methods to solve the resulting discretized linear systems. Theoretical analysis of spectral distributions of the preconditioned matrix is also given. Numerical results exhibit that the proposed preconditioner can significantly improve the convergence of the Krylov subspace iteration methods.
      PubDate: 2021-10-12
       
  • General Lagrange scaling functions: application in general model of
           variable order fractional partial differential equations

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      Abstract: This paper studies a numerical technique to solve general variable-order partial differential equations. We present a general variable-order Riemann-Liouville pseudo-operational matrix and a general variable-order fractional derivative pseudo-operational matrix for the general Lagrange scaling functions (GLSFs). These matrices are achieved generally, without considering the nodes of Lagrange polynomials. Next, by implementing the obtained pseudo-operational matrices and an optimization method, the considered problem reduces to a system of nonlinear algebraic equations. Additionally, the convergence analysis is proposed and three numerical examples illustrate its good performance.
      PubDate: 2021-10-12
       
  • On main eigenvalues of chain graphs

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      Abstract: In this paper, we consider the main eigenvalues of connected chain graphs. We provide some properties of the eigenvectors corresponding to the main eigenvalues, upper and lower bounds on the number of main eigenvalues in connected chain graphs as well as examples that show that these bounds are attainable. As a consequence, we show that, for any positive integer k there exists a chain graph with k main eigenvalues. We also prove that there is no connected controllable chain graph. Our results make a bridge between the spectral properties of tridiagonal matrices and of chain graphs.
      PubDate: 2021-10-12
       
  • Improved MABAC method based on single-valued neutrosophic 2-tuple
           linguistic sets and Frank aggregation operators for MAGDM

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      Abstract: In this paper, multiple attribute group decision making(MAGDM) problems with single-valued neutrosophic 2-tuple linguistic (SVN2TL) set information are presented based on Frank operator, extend multi-attributive border approximation area comparison (MABAC) method, and best worst method (BWM). We first give the the concept of BWM method, Frank operator, and basic operational rules on SVN2TL set with Frank t-norms and t-conorms. Then, two aggregation operators including SVN2TL Frank weighted averaging (SVN2TLFWA) operator and Frank weighted geometric (SVN2TLFWG) operator are developed, and some desirable properties are discussed as well. What’s more, an iterative algorithm is designed for the determination of decision makers’ weight based on BWM method. Subsequently, combine the extend MABAC method and proposed operators, a new approach is developed to deal MAGDM with SVN2TL information. Finally, a numerical example has been given to show the procedure of the proposed method, and some sensitivity and comparative analysis are also conducted to illustrate the effectiveness and superiority of the proposed method.
      PubDate: 2021-10-12
       
  • Weighted Lindley multiplicative regression frailty models under random
           censored data

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      Abstract: The emphasis of conventional survival research methods has historically been on the occurrence of failures over time. The lack of knowledge of related observed and unobserved covariates during the study of such events can have negative consequences. Frailty models are a viable option for investigating the impact of unobserved covariates in this context. In this article, we suppose that frailty multiplies the hazard rate. As a useful method to ensure the effect of unobserved heterogeneity, we propose weighted Lindley (WL) frailty models with generalized Weibull (GW) and generalized log-logistic-II (GLL2) as the baseline distributions. The Bayesian paradigm of Markov Chain Monte Carlo (MCMC) methodology is used to estimate the model parameters. Subsequently, model comparisons are performed via Bayesian comparison techniques. The popular kidney data set is considered to illustrate the results. It is shown that the new models perform better than those based on gamma and inverse Gaussian frailty distributions.
      PubDate: 2021-10-11
       
  • Modified intermixed iteration for solving the split general system of
           variational inequality problems and applications

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      Abstract: Inspired by the works of Siriyan and Kangtunyakarn (2018) and Yao et al. (2015), we first introduce the two-step intermixed iteration for finding a common element of the set of the solutions of the split general system of variational inequality problem (SGSV), and also, we prove strong convergence theorem of the intermixed algorithm. Using our main theorem, we prove strong convergence theorems for finding solutions to the split variational inequality problem (SVIP), the split feasibility problem (SFP), and the split common fixed point problem (SCFP). Moreover, we give three numerical examples of these classical problems introduced by the previous studies and an example that conflicts with our main theorem where some conditions fail.
      PubDate: 2021-10-10
       
  • Global exponential stability of bidirectional associative memory neural
           networks model with piecewise alternately advanced and retarded argument

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      Abstract: This article is concerned with the effects of piecewise constant argument on exponential stability to a unique equilibrium state of bidirectional associative memories (BAMs) neural networks model. Based on the fixed point theorem approach and an integral inequality of Gronwall type with deviation arguments, we have derived sufficient criteria to guarantee the existence, uniqueness and global exponential stability of the equilibrium state for the BAM model. Finally, the efficiency of the theoretical results has been illustrated by providing two numerical examples with simulations.
      PubDate: 2021-10-08
       
  • Worst-case evaluation complexity of derivative-free nonmonotone line
           search methods for solving nonlinear systems of equations

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      Abstract: In this paper, we study a class of derivative-free nonmonotone line search methods for solving nonlinear systems of equations, which includes the method N-DF-SANE proposed in Cheng and Li (IMA J Numer Anal 29:814–825, 2009). These methods correspond to derivative-free optimization methods applied to the minimization of a suitable merit function. Assuming that the mapping defining the system of nonlinear equations has Lipschitz continuous Jacobian, we show that the methods in the referred class need at most \({\mathcal {O}}\left( \log (\epsilon ) \epsilon ^{-2}\right) \) function evaluations to generate an \(\epsilon \) -approximate stationary point to the merit function. For the case in which the mapping is strongly monotone, we present two methods with evaluation-complexity of \({\mathcal {O}}\left( \log (\epsilon ) \right) \) .
      PubDate: 2021-10-07
       
  • Mostar index and edge Mostar index of polymers

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      Abstract: Let \(G=(V,E)\) be a graph and \(e=uv\in E\) . Define \(n_u(e,G)\) be the number of vertices of G closer to u than to v. The number \(n_v(e,G)\) can be defined in an analogous way. The Mostar index of G is a new graph invariant defined as \(Mo(G)=\sum _{uv\in E(G)} n_u(uv,G)-n_v(uv,G) \) . The edge version of Mostar index is defined as \(Mo_e(G)=\sum _{e=uv\in E(G)} m_u(e G)-m_v(G e) \) , where \(m_u(e G)\) and \(m_v(e G)\) are the number of edges of G lying closer to vertex u than to vertex v and the number of edges of G lying closer to vertex v than to vertex u, respectively. Let G be a connected graph constructed from pairwise disjoint connected graphs \(G_1,\ldots ,G_k\) by selecting a vertex of \(G_1\) , a vertex of \(G_2\) , and identifying these two vertices. Then continue in this manner inductively. We say that G is a polymer graph, obtained by point-attaching from monomer units \(G_1,\ldots ,G_k\) . In this paper, we consider some particular cases of these graphs that are of importance in chemistry and study their Mostar and edge Mostar indices.
      PubDate: 2021-10-07
       
  • A different monotone iterative technique for a class of nonlinear
           three-point BVPs

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      Abstract: This work examines the existence of the solutions of a class of three-point nonlinear boundary value problems that arise in bridge design due to its nonlinear behavior. A maximum and anti-maximum principles are derived with the support of Green’s function and their constant sign. A different monotone iterative technique is developed with the use of lower solution x(z) and upper solution y(z). We have also discussed the classification of well ordered ( \(x\le y\) ) and reverse ordered ( \( y\le x\) ) cases for both positive and negative values of \( \sup \left( \frac{\partial f}{\partial w}\right) \) . Established results are verified with the help of some examples.
      PubDate: 2021-10-07
       
  • Application of optimized GM (1,1) model based on EMD in landslide
           deformation prediction

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      Abstract: The monitoring data of landslide deformation are characterized by non-smooth, nonlinear and random changes, and the cumulative changes of the monitored objects have both monotonous growth trends and short-term fluctuations. The GM(1,1) model can get better results only when the data series are monotonous. Due to the limitations of the model, the prediction accuracy of the GM(1,1) model is limited to a certain extent. An improved algorithm based on the GM(1,1) model and the empirical mode decomposition (EMD-GM(1,1) model) for deformation prediction was presented to improve the forecast accuracy in this paper. Firstly, EMD was used to effectively separate the nonlinear high-frequency and low-frequency components hidden in the deformation sequence; then the moving average method was applied to build a prediction model for high-frequency component, and the GM(1,1) was applied to build the prediction model for low-frequency one according to the characteristics of each component; finally, the predicted value of each component was superimposed. The experimental results indicate that the optimized EMD-GM(1,1) model combines the advantages of the two models to separate effectively the different frequency components of the deformation sequence, which has higher prediction accuracy. Compared with the conventional GM(1,1) model, DGM(2,1) model and the Linear fitting model, the proposed model could satisfactorily describe the landslide deformation prediction practically.
      PubDate: 2021-10-07
       
  • Multi-objective infinite horizon optimal control problems:
           characterization of the Pareto fronts and Pareto solutions

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      Abstract: In this paper, multi-objective infinite horizon optimal control problems with state constraints are investigated. First, a mono-objective auxiliary optimal control problem, free of state constraints, is introduced. The weak Pareto front of the multi-objective optimal problem is related to a set contained in the boundary of the zero level set of the value function of the auxiliary control problem. Moreover, a more detailed characterization of the Pareto front for the multi-objective problem is presented. In the infinite horizon context, the value function of the auxiliary optimal control problem satisfies a Hamilton–Jacobi–Bellman equation; however, it is not the unique solution. A semi-Lagrangian scheme, based on the Dynamic Programming Principle, is considered to compute the value function of the auxiliary optimal control problem. Furthermore, optimal Pareto trajectory reconstruction is analyzed.
      PubDate: 2021-10-07
       
  • On numerical simulations of time fractional Phi-four equation using Caputo
           derivative

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      Abstract: The fractional model which played an essential role in nuclear and particle physics used to describe the nuclear element interaction is the Phi-four model. This manuscript aims to scrutinize the new numerical solution of the nonlinear time fractional Phi-four equation subject to nonhomogeneous initial-boundary conditions by means of cubic-B-spline collocation method (CBSCM). The main advantage of cubic B-spline method over existing techniques is that it efficiently provides a piecewise-continuous, closed form solution and it is simpler and easy to apply to many problems involving partial differential equations. In this approach the fractional differential equation is converted into system of equations. The non-integer derivative " \(\alpha \) " is considered in Caputo sense. The discretization of Caputo derivative is done using L1 formula, while B-spline basis functions are used for the interpolation of spatial derivative. The applicability of the proposed scheme is examined on two test problems. The influence of different parameters is studied and captured graphically and numerically. The proposed scheme is proved to be unconditionally stable. Moreover, the error norms are computed to quantify the accuracy.
      PubDate: 2021-09-30
       
  • A new quantile regression for the COVID-19 mortality rates in the United
           States

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      Abstract: An outbreak of coronavirus disease 2019 (COVID-19) has quickly spread worldwide from December 2019, thus characterizing a pandemic. Until August 2020, the United States of America (U.S.) accounted for almost one-fourth of the total deaths by coronavirus. In this paper, a new regression is constructed to identify the variables that affected the first-wave COVID-19 mortality rates in the U.S. states. The mortality rates in these states are computed by considering the total of deaths recorded on 30, 90, and 180 days from the 10th recorded case. The proposed regression is compared to the Kumaraswamy and unit-Weibull regressions, which are useful in modeling proportional data. It provides the best goodness-of-fit measures for the mortality rates and explains \(76.57\%\) of its variability. The population density, Gini coefficient, hospital beds, and smoking rate explain the median of the COVID-19 mortality rates in these states. We believe that this article’s results reveal important points to face pandemic threats by the State Health Departments in the U.S.
      PubDate: 2021-09-29
       
  • A posteriori error estimates for the
           Brinkman–Darcy–Forchheimer problem

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      Abstract: In this paper, we study the a posteriori error estimate corresponding to the Brinkman–Darcy–Forchheimer problem. We introduce the variational formulation discretized by using the finite element method. Then, we establish an a posteriori error estimation with two types of error indicators related to the discretization and to the linearization. Finally, numerical investigations are shown and discussed.
      PubDate: 2021-09-29
       
  • Non-iterative compact operator splitting scheme for Allen–Cahn
           equation

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      Abstract: The compact method guarantees high order accuracy and comprise point stencils; however, the alternating direction implicit (ADI)-type operator splitting method is difficult to implement. Here, a non-iterative compact ADI-type operator splitting scheme with stability for the Allen–Cahn equation is presented. Operator splitting comprises temporal and spatial splitting. Temporal splitting is based on the hybrid method, which combines numerical and analytical methods to resolve the nonlinearity of the equation, and the maximum principle is maintained unconditionally. In addition, the temporal accuracy can be easily extended to the second or higher order. Spatial splitting is considered for a compact operator with a simple ADI-type implementation. This allows the Thomas algorithm, which is simple and fast, to be applied, including for solving two- and three-dimensional problems. The stability and accuracy proofs of the proposed scheme are presented. The numerical results show that the accuracy, stability, efficiency, and dynamics are consistent with theory.
      PubDate: 2021-09-28
       
  • Modeling and solving the uncapacitated r-allocation p-hub median problem
           under congestion

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      Abstract: The hub location problems deal with determining the optimal location of hub facilities and allocating the demand nodes to these hubs in such a way that the traffic between any origin–destination pair is routed effectively. This paper proposes the uncapacitated r-allocation p-hub median problem under congestion. The problem is formulated as a second-order cone programming and an efficient simulated annealing heuristic algorithm is proposed to solve the large instances of the problem. Extensive computational experiments are conducted based on three well-known data sets to demonstrate the efficiency of the proposed algorithm and also to study the effect of different input parameters on the optimal solutions. Some managerial insights are derived based on the obtained numerical results.
      PubDate: 2021-09-27
       
  • A modified proximal point algorithm for a nearly asymptotically
           quasi-nonexpansive mapping with an application

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      Abstract: In this paper, we introduce a new modified proximal point algorithm based on M-iteration to approximate a common element of the set of solutions of convex minimization problems and the set of fixed points of nearly asymptotically quasi-nonexpansive mapping in CAT(0) space. We also prove the \(\Delta \) -convergence of the proposed algorithm for solving common minimization problem and fixed point problem. We also provide an application and numerical results based on our proposed algorithm.
      PubDate: 2021-09-27
       
 
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