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MATHEMATICS (656 journals)                  1 2 3 4 | Last

Showing 1 - 200 of 538 Journals sorted alphabetically
Abakós     Open Access   (Followers: 4)
Abhandlungen aus dem Mathematischen Seminar der Universitat Hamburg     Hybrid Journal   (Followers: 3)
Academic Voices : A Multidisciplinary Journal     Open Access   (Followers: 2)
Accounting Perspectives     Full-text available via subscription   (Followers: 8)
ACM Transactions on Algorithms (TALG)     Hybrid Journal   (Followers: 16)
ACM Transactions on Computational Logic (TOCL)     Hybrid Journal   (Followers: 4)
ACM Transactions on Mathematical Software (TOMS)     Hybrid Journal   (Followers: 6)
ACS Applied Materials & Interfaces     Full-text available via subscription   (Followers: 22)
Acta Applicandae Mathematicae     Hybrid Journal   (Followers: 1)
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: 5)
Acta Mathematica Vietnamica     Hybrid Journal  
Acta Mathematicae Applicatae Sinica, English Series     Hybrid Journal  
Advanced Science Letters     Full-text available via subscription   (Followers: 8)
Advances in Applied Clifford Algebras     Hybrid Journal   (Followers: 3)
Advances in Calculus of Variations     Hybrid Journal   (Followers: 2)
Advances in Catalysis     Full-text available via subscription   (Followers: 5)
Advances in Complex Systems     Hybrid Journal   (Followers: 7)
Advances in Computational Mathematics     Hybrid Journal   (Followers: 15)
Advances in Decision Sciences     Open Access   (Followers: 5)
Advances in Difference Equations     Open Access   (Followers: 1)
Advances in Fixed Point Theory     Open Access   (Followers: 5)
Advances in Geosciences (ADGEO)     Open Access   (Followers: 10)
Advances in Linear Algebra & Matrix Theory     Open Access   (Followers: 2)
Advances in Materials Sciences     Open Access   (Followers: 16)
Advances in Mathematical Physics     Open Access   (Followers: 5)
Advances in Mathematics     Full-text available via subscription   (Followers: 10)
Advances in Numerical Analysis     Open Access   (Followers: 4)
Advances in Operations Research     Open Access   (Followers: 11)
Advances in Porous Media     Full-text available via subscription   (Followers: 4)
Advances in Pure and Applied Mathematics     Hybrid Journal   (Followers: 6)
Advances in Pure Mathematics     Open Access   (Followers: 4)
Advances in Science and Research (ASR)     Open Access   (Followers: 6)
Aequationes Mathematicae     Hybrid Journal   (Followers: 2)
African Journal of Educational Studies in Mathematics and Sciences     Full-text available via subscription   (Followers: 5)
African Journal of Mathematics and Computer Science Research     Open Access   (Followers: 4)
Afrika Matematika     Hybrid Journal   (Followers: 1)
Air, Soil & Water Research     Open Access   (Followers: 8)
AKSIOMA Journal of Mathematics Education     Open Access   (Followers: 1)
Al-Jabar : Jurnal Pendidikan Matematika     Open Access  
Algebra and Logic     Hybrid Journal   (Followers: 4)
Algebra Colloquium     Hybrid Journal   (Followers: 4)
Algebra Universalis     Hybrid Journal   (Followers: 2)
Algorithmic Operations Research     Full-text available via subscription   (Followers: 5)
Algorithms     Open Access   (Followers: 11)
Algorithms Research     Open Access   (Followers: 1)
American Journal of Biostatistics     Open Access   (Followers: 9)
American Journal of Computational and Applied Mathematics     Open Access   (Followers: 4)
American Journal of Mathematical Analysis     Open Access  
American Journal of Mathematics     Full-text available via subscription   (Followers: 7)
American Journal of Operations Research     Open Access   (Followers: 5)
American Mathematical Monthly     Full-text available via subscription   (Followers: 6)
An International Journal of Optimization and Control: Theories & Applications     Open Access   (Followers: 7)
Analele Universitatii Ovidius Constanta - Seria Matematica     Open Access   (Followers: 1)
Analysis     Hybrid Journal   (Followers: 2)
Analysis and Applications     Hybrid Journal   (Followers: 1)
Analysis and Mathematical Physics     Hybrid Journal   (Followers: 3)
Analysis Mathematica     Full-text available via subscription  
Annales Mathematicae Silesianae     Open Access  
Annales mathématiques du Québec     Hybrid Journal   (Followers: 4)
Annales UMCS, 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: 9)
Annals of Discrete Mathematics     Full-text available via subscription   (Followers: 6)
Annals of Mathematics     Full-text available via subscription  
Annals of Mathematics and Artificial Intelligence     Hybrid Journal   (Followers: 6)
Annals of Pure and Applied Logic     Open Access   (Followers: 2)
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  
Annuaire du Collège de France     Open Access   (Followers: 5)
Applicable Algebra in Engineering, Communication and Computing     Hybrid Journal   (Followers: 2)
Applications of Mathematics     Hybrid Journal   (Followers: 1)
Applied Categorical Structures     Hybrid Journal   (Followers: 2)
Applied Computational Intelligence and Soft Computing     Open Access   (Followers: 12)
Applied Mathematics     Open Access   (Followers: 3)
Applied Mathematics     Open Access   (Followers: 4)
Applied Mathematics & Optimization     Hybrid Journal   (Followers: 4)
Applied Mathematics - A Journal of Chinese Universities     Hybrid Journal  
Applied Mathematics Letters     Full-text available via subscription   (Followers: 1)
Applied Mathematics Research eXpress     Hybrid Journal   (Followers: 1)
Applied Network Science     Open Access   (Followers: 1)
Applied Numerical Mathematics     Hybrid Journal   (Followers: 5)
Applied Spatial Analysis and Policy     Hybrid Journal   (Followers: 4)
Arab Journal of Mathematical Sciences     Open Access   (Followers: 3)
Arabian Journal of Mathematics     Open Access   (Followers: 2)
Archive for Mathematical Logic     Hybrid Journal   (Followers: 1)
Archive of Applied Mechanics     Hybrid Journal   (Followers: 5)
Archive of Numerical Software     Open Access  
Archives of Computational Methods in Engineering     Hybrid Journal   (Followers: 4)
Arkiv för Matematik     Hybrid Journal   (Followers: 1)
Arnold Mathematical Journal     Hybrid Journal   (Followers: 1)
Artificial Satellites : The Journal of Space Research Centre of Polish Academy of Sciences     Open Access   (Followers: 20)
Asia-Pacific Journal of Operational Research     Hybrid Journal   (Followers: 3)
Asian Journal of Algebra     Open Access   (Followers: 1)
Asian Journal of Current Engineering & Maths     Open Access  
Asian-European Journal of Mathematics     Hybrid Journal   (Followers: 2)
Australian Mathematics Teacher, The     Full-text available via subscription   (Followers: 7)
Australian Primary Mathematics Classroom     Full-text available via subscription   (Followers: 2)
Australian Senior Mathematics Journal     Full-text available via subscription   (Followers: 1)
Automatic Documentation and Mathematical Linguistics     Hybrid Journal   (Followers: 5)
Axioms     Open Access  
Baltic International Yearbook of Cognition, Logic and Communication     Open Access  
Basin Research     Hybrid Journal   (Followers: 5)
BIBECHANA     Open Access   (Followers: 1)
BIT Numerical Mathematics     Hybrid Journal  
BoEM - Boletim online de Educação Matemática     Open Access  
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: 1)
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: 8)
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: 1)
Bulletin of Mathematical Sciences     Open Access   (Followers: 1)
Bulletin of the Brazilian Mathematical Society, New Series     Hybrid Journal  
Bulletin of the London Mathematical Society     Hybrid Journal   (Followers: 3)
Bulletin of the Malaysian Mathematical Sciences Society     Hybrid Journal  
Calculus of Variations and Partial Differential Equations     Hybrid Journal  
Canadian Journal of Science, Mathematics and Technology Education     Hybrid Journal   (Followers: 20)
Carpathian Mathematical Publications     Open Access   (Followers: 1)
Catalysis in Industry     Hybrid Journal   (Followers: 1)
CEAS Space Journal     Hybrid Journal  
CHANCE     Hybrid Journal   (Followers: 5)
Chaos, Solitons & Fractals     Hybrid Journal   (Followers: 3)
ChemSusChem     Hybrid Journal   (Followers: 7)
Chinese Annals of Mathematics, Series B     Hybrid Journal  
Chinese Journal of Catalysis     Full-text available via subscription   (Followers: 2)
Chinese Journal of Mathematics     Open Access  
Clean Air Journal     Full-text available via subscription   (Followers: 2)
Cogent Mathematics     Open Access   (Followers: 2)
Cognitive Computation     Hybrid Journal   (Followers: 4)
Collectanea Mathematica     Hybrid Journal  
College Mathematics Journal     Full-text available via subscription   (Followers: 3)
COMBINATORICA     Hybrid Journal  
Combustion Theory and Modelling     Hybrid Journal   (Followers: 13)
Commentarii Mathematici Helvetici     Hybrid Journal   (Followers: 1)
Communications in Contemporary Mathematics     Hybrid Journal  
Communications in Mathematical Physics     Hybrid Journal   (Followers: 1)
Communications On Pure & Applied Mathematics     Hybrid Journal   (Followers: 3)
Complex Analysis and its Synergies     Open Access   (Followers: 2)
Complex Variables and Elliptic Equations: An International Journal     Hybrid Journal  
Complexus     Full-text available via subscription  
Composite Materials Series     Full-text available via subscription   (Followers: 9)
Comptes Rendus Mathematique     Full-text available via subscription   (Followers: 1)
Computational and Applied Mathematics     Hybrid Journal   (Followers: 2)
Computational and Mathematical Methods in Medicine     Open Access   (Followers: 2)
Computational and Mathematical Organization Theory     Hybrid Journal   (Followers: 2)
Computational Complexity     Hybrid Journal   (Followers: 4)
Computational Mathematics and Modeling     Hybrid Journal   (Followers: 8)
Computational Mechanics     Hybrid Journal   (Followers: 4)
Computational Methods and Function Theory     Hybrid Journal  
Computational Optimization and Applications     Hybrid Journal   (Followers: 7)
Computers & Mathematics with Applications     Full-text available via subscription   (Followers: 5)
Concrete Operators     Open Access   (Followers: 4)
Confluentes Mathematici     Hybrid Journal  
COSMOS     Hybrid Journal  
Cryptography and Communications     Hybrid Journal   (Followers: 14)
Cuadernos de Investigación y Formación en Educación Matemática     Open Access  
Cubo. A Mathematical Journal     Open Access  
Czechoslovak Mathematical Journal     Hybrid Journal   (Followers: 1)
Demographic Research     Open Access   (Followers: 11)
Demonstratio Mathematica     Open Access  
Dependence Modeling     Open Access  
Design Journal : An International Journal for All Aspects of Design     Hybrid Journal   (Followers: 28)
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: 2)
Discrete Mathematics     Hybrid Journal   (Followers: 8)
Discrete Mathematics & Theoretical Computer Science     Open Access  
Discrete Mathematics, Algorithms and Applications     Hybrid Journal   (Followers: 2)
Discussiones Mathematicae Graph Theory     Open Access   (Followers: 1)
Dnipropetrovsk University Mathematics Bulletin     Open Access  
Doklady Mathematics     Hybrid Journal  
Duke Mathematical Journal     Full-text available via subscription   (Followers: 1)
Edited Series on Advances in Nonlinear Science and Complexity     Full-text available via subscription  
Electronic Journal of Graph Theory and Applications     Open Access   (Followers: 2)
Electronic Notes in Discrete Mathematics     Full-text available via subscription   (Followers: 2)
Elemente der Mathematik     Full-text available via subscription   (Followers: 3)
Energy for Sustainable Development     Hybrid Journal   (Followers: 9)
Enseñanza de las Ciencias : Revista de Investigación y Experiencias Didácticas     Open Access  
Ensino da Matemática em Debate     Open Access  
Entropy     Open Access   (Followers: 5)
ESAIM: Control Optimisation and Calculus of Variations     Full-text available via subscription   (Followers: 1)
European Journal of Combinatorics     Full-text available via subscription   (Followers: 5)
European Journal of Mathematics     Hybrid Journal   (Followers: 1)
European Scientific Journal     Open Access   (Followers: 2)
Experimental Mathematics     Hybrid Journal   (Followers: 4)
Expositiones Mathematicae     Hybrid Journal   (Followers: 2)
Facta Universitatis, Series : Mathematics and Informatics     Open Access  
Fasciculi Mathematici     Open Access  
Finite Fields and Their Applications     Full-text available via subscription   (Followers: 4)
Fixed Point Theory and Applications     Open Access   (Followers: 1)

        1 2 3 4 | Last

Journal Cover Computational and Applied Mathematics
  [SJR: 0.515]   [H-I: 15]   [2 followers]  Follow
   Hybrid Journal Hybrid journal (It can contain Open Access articles)
   ISSN (Print) 0101-8205 - ISSN (Online) 1807-0302
   Published by Springer-Verlag Homepage  [2352 journals]
  • Applications of celestial mechanics in natural objects and spacecrafts
    • Authors: Vivian Martins Gomes; Cristiano Fiorilo de Mello; Elbert E. N. Macau; Antonio Fernando Bertachini de Alme Prado; Othon Cabo Winter
      Pages: 1463 - 1469
      Abstract: Abstract Studies related to Celestial Mechanics started long ago, and it is one of the oldest fields in Astronomy. It started to try to explain the motions of the stars in the sky, in particular the irregular motion of some of those of then, which were really the planets of the Solar System. In the 20th century, with the arrival of the “Space Age”, many applications related to the motion of artificial spacecrafts appeared. This new field was called “Astrodynamics”, to designate the use of Celestial Mechanics in man-made objects. Several aspects, like orbit determination, maneuvers to change the orbit of the spacecraft, etc., are covered by this topic. The present Focus Issue in Celestial Mechanics publishes a list of papers in topics related to applications in Celestial Mechanics to both situations: natural and artificial satellites.
      PubDate: 2017-12-01
      DOI: 10.1007/s40314-017-0499-9
      Issue No: Vol. 36, No. 4 (2017)
  • A Benders decomposition approach for order acceptance and scheduling
           problem: a robust optimization approach
    • Authors: Saeed Emami; Ghasem Moslehi; Mohammad Sabbagh
      Pages: 1471 - 1515
      Abstract: Abstract In this paper, we consider a simultaneous order acceptance and scheduling problem in a non-identical parallel machines environment. The orders are defined by their due dates, revenues, tardiness penalties, different processing times on the machines, and sequence-dependent setup times. We present an MILP formulation to maximize the profit. Furthermore, we assume that the revenue from an accepted order and the processing times are uncertain and accordingly, develop the robust counterpart of the proposed MILP model. The problem is computationally intractable; therefore, we develop a Benders decomposition approach to solve it. We introduce some valid cuts to accelerate the convergence of the classical Benders algorithm and a heuristic method to obtain the feasible solutions. Through numerical experiments on randomly generated large instances with up to 40 orders and 6 machines, we demonstrate that the proposed Benders decomposition approach outperforms the MILP model.
      PubDate: 2017-12-01
      DOI: 10.1007/s40314-015-0302-8
      Issue No: Vol. 36, No. 4 (2017)
  • Numerical methods and fuzzy parameters: an environmental impact assessment
           in aquatic systems
    • Authors: Elaine Cristina Catapani Poletti; João Frederico da Costa Azevedo Meyer
      Pages: 1517 - 1528
      Abstract: Abstract This paper proposes to analyze the dispersion of pollutants in aquatic systems, solving the advection–diffusion equation using numerical methods and fuzzy sets. For solution, numerical approximations were adopted, based on the finite element method for the spatial discretization and Crank–Nicolson for the time variable. The parameters of the equation were modeled taking into account aspects of multiple varieties of natural phenomena, based on fuzzy sets. The two-dimensional model resulted in the value of pollutant dispersion taking into account the flow velocity, in situations of prevailing winds in the region of a reservoir of Sao Paulo. According to the results, it was observed that the integration of the numerical methods and the fuzzy parameters is a potential instrument for environmental process analysis. The rule-based systems allowed a better design of the local natural phenomena. The spread of the plumes of pollutants was well defined by the model and the simulated scenarios are in agreement, from a qualitative point of view, with the local reality.
      PubDate: 2017-12-01
      DOI: 10.1007/s40314-015-0299-z
      Issue No: Vol. 36, No. 4 (2017)
  • Integrated production and delivery scheduling for multi-factory supply
           chain with stage-dependent inventory holding cost
    • Authors: N. Karimi; H. Davoudpour
      Pages: 1529 - 1544
      Abstract: Abstract This paper will introduce a new scheduling problem in the supply chain. This is an integrated scheduling and transportation problem where stage-dependent holding cost is taken into consideration. This supply chain consists of a number of serial factories joined together. The objective is minimizing the whole system’s criteria which are the sum of the transportation cost and stage-dependent holding costs. Transporting and delivering a number of jobs in the form of batches are also allowed. In scheduling systems with delivery, a job can be delivered when its processing is completed. The processed job should remain in the system until its batch’s completion time. On the other hand, on receiving at a factory, jobs should wait until their process has started. These would impose the WIP inventory cost. The other holding cost imposed on the system is finished-goods holding cost which is incurred on the jobs that are delivered to the customer before their due dates. Thus, the objective of this study is to find a schedule with trade-off among holding costs and delivery cost. A time-indexed formulation of the problem is also presented. Computational studies are performed to check the performance of the proposed models.
      PubDate: 2017-12-01
      DOI: 10.1007/s40314-016-0305-0
      Issue No: Vol. 36, No. 4 (2017)
  • Weighted moving averaging revisited: an algebraic approach
    • Authors: Mantas Landauskas; Zenonas Navickas; Alfonsas Vainoras; Minvydas Ragulskis
      Pages: 1545 - 1558
      Abstract: Abstract An algebraic approach for the selection of weight coefficients for weighted moving averaging is proposed in this paper. The algebraic complexity of the sequence transformed by weighted moving averaging is set as a target criterion for the optimization problem of weight coefficients. A special computational setup is constructed in order to tackle the inevitable additive noise for real-world time series. Computational experiments prove that the proposed approach can outperform time series predictors based on classical moving averaging.
      PubDate: 2017-12-01
      DOI: 10.1007/s40314-016-0309-9
      Issue No: Vol. 36, No. 4 (2017)
  • Tomographic reconstruction from a small number of projections by an
           efficient sum-product reasoning method
    • Authors: Wenwen Zeng; Xiaopin Zhong; Jingzhen Li; Yupeng Fan
      Pages: 1559 - 1575
      Abstract: Abstract Tomographic reconstruction from a small number of projections is still a challenging problem. In the paper, we formulate this problem as a statistical graphical model by the smooth assumption that the image has a structure where neighbor pixels have a larger probability to take a closer value. This Markov random filed framework allows easily integrating other prior information. Reasoning in the model can be solved using belief propagation algorithm. However, one projection line involves multiple pixels. This leads to high order cliques and exponential computation in the message passing procedure. A variable-change strategy is used to largely reduce the computation and forms an efficient sum-product reasoning algorithm. Numerical simulation examples show that the proposed method greatly surpasses traditional methods, such as FBP, EM and ART. Our method is suitable not only for the case of a very small amount of projection, but also for the multi-pixel-value case.
      PubDate: 2017-12-01
      DOI: 10.1007/s40314-016-0313-0
      Issue No: Vol. 36, No. 4 (2017)
  • Fast algorithm for structural dynamics problems using differential
           quadrature method and $${\varvec{V}}$$ V -transformation
    • Authors: Wang Fangzong; Liao Xiaobing
      Pages: 1577 - 1590
      Abstract: Abstract The differential quadrature method (DQM) has been widely used for structural dynamics problems computation. Traditional DQM usually adopts simultaneous discretization in multi-grid points, and then all variables are solved simultaneously. Obviously, this will result in the curse of dimensionality problem for large-scale systems. In this paper, on the basis of the multi-stage high-order time domain DQM, a fast numerical calculation method for large-scale structural dynamics problems based on \({\varvec{V}}\) -transformation is proposed. Using the \({\varvec{V}}\) -transformation possessed by the weighting coefficient matrix of DQM, the whole Jacobian matrix equations involved in the traditional approach of DQM can be decoupled into blocks; thus, the multi-stage block recursive method is derived. Numerical experiments show that: even using 2s times step size of the Newmark method, the computational accuracy of DQM is about 2–3 orders of magnitude higher than that of the Newmark method. Furthermore, three different scale systems are used for time test and the results show that the multi-stage block recursive method can obtain high speedup ratio, which can significantly improve the computational efficiency of large-scale structural dynamics problems.
      PubDate: 2017-12-01
      DOI: 10.1007/s40314-016-0310-3
      Issue No: Vol. 36, No. 4 (2017)
  • Generalized product-type methods based on bi-conjugate gradient (GPBiCG)
           for solving shifted linear systems
    • Authors: Mehdi Dehghan; Reza Mohammadi-Arani
      Pages: 1591 - 1606
      Abstract: Abstract GPBiCG is a generalization of a class of product-type methods where the residual polynomials can be factored by the residual polynomial of BiCG and other polynomials with standard three-term recurrence relations. Actually this method generalizes CGS and BiCGStab methods. In this paper we use GPBiCG to present a new method for solving shifted linear systems. GPBiCG is faster than BiCGStab and its convergence is smoother than CGS. So here we are expecting to develop a method which is faster and its convergence is smoother than shifted BiCGStab and shifted CGS methods for solving shifted linear systems.
      PubDate: 2017-12-01
      DOI: 10.1007/s40314-016-0315-y
      Issue No: Vol. 36, No. 4 (2017)
  • Common fixed points of set-valued F-contraction mappings on domain of sets
           endowed with directed graph
    • Authors: Mujahid Abbas; Talat Nazir; Tatjana Aleksić Lampert; Stojan Radenović
      Pages: 1607 - 1622
      Abstract: Abstract The aim of this paper is to present common fixed point results of set-valued graphic F-contraction mappings on a family of sets endowed with a graph. Some examples are presented to support the results proved herein. Our results unify, generalize and extend various results in the existing literature.
      PubDate: 2017-12-01
      DOI: 10.1007/s40314-016-0314-z
      Issue No: Vol. 36, No. 4 (2017)
  • On the iterative criterion for strong $$\mathcal {H}$$ H -tensors
    • Authors: Qilong Liu; Chaoqian Li; Yaotang Li
      Pages: 1623 - 1635
      Abstract: Abstract Strong \(\mathcal {H}\) -tensors play an important role in identifying the positive definiteness of even-order real symmetric tensor. An iterative algorithm for identifying strong \(\mathcal {H}\) -tensors was given in Li et al. (J Comput Appl Math 255:1–14, 2014), where the method does not stop in finite iterative steps when the tensor is not a strong \(\mathcal {H}\) -tensor. In this paper, to overcome this drawback, we present a new algorithm which always terminates after finite iterative steps and needs fewer iterations than the earlier one for a general tensor. Numerical examples are given to show the effectiveness of the proposed method.
      PubDate: 2017-12-01
      DOI: 10.1007/s40314-016-0311-2
      Issue No: Vol. 36, No. 4 (2017)
  • Iterative penalty finite element methods for the steady incompressible
           magnetohydrodynamic problem
    • Authors: Jien Deng; Zhenzhen Tao; Tong Zhang
      Pages: 1637 - 1657
      Abstract: Abstract In the paper we consider the one-level and two-level iterative penalty finite element methods for the steady incompressible magnetohydrodynamic problem based on the iteration of pressure with a factor of penalty parameter. Firstly, the \(\mathbf {H}^1\) and \(\mathbf {L}^2\) error estimates of numerical solutions of one-level iterative penalty finite element method are provided. Secondly, the stability and convergence of two-level iterative penalty finite element method are analyzed. Finally, some numerical results are provided to verify the effectiveness of the developed numerical schemes.
      PubDate: 2017-12-01
      DOI: 10.1007/s40314-016-0323-y
      Issue No: Vol. 36, No. 4 (2017)
  • NURBS modeling and isogeometric shell analysis for complex tubular
           engineering structures
    • Authors: Xiangkui Zhang; Chunning Jin; Ping Hu; Xuefeng Zhu; Wenbin Hou; Jinting Xu; Changsheng Wang; Yuewei Zhang; Zheng-Dong Ma; Holly Smith
      Pages: 1659 - 1679
      Abstract: Abstract We present an approach to construct NURBS (Non-Uniform Rational B-Splines) surfaces for tubular engineering structures. Isogeometric shell analysis using degenerated NURBS elements for tubular structures is also presented. We developed an automatic and simple algorithm to reconstruct multiple \(C^0\) continuous NURBS surfaces using the skeleton withdrawn from the trimmed CAD model. Isogeometric shell analysis based on Reissner–Mindlin theory was applied to the reconstructed model. To verify the efficiency of the present method, we constructed the CAD model of the car body of an electric car and simulate the deformation of an electric car using isogeometric shell analysis.
      PubDate: 2017-12-01
      DOI: 10.1007/s40314-016-0312-1
      Issue No: Vol. 36, No. 4 (2017)
  • Asymptotic analysis of continuous fuzzy flows
    • Authors: M. S. Cecconello; Jefferson Leite; R. C. Bassanezi
      Pages: 1681 - 1697
      Abstract: Abstract In this work, we analyze the asymptotic behavior of fuzzy solutions using recent results on equilibrium and periodic points. We apply this analysis in some examples to investigate interesting properties of fuzzy solutions. As we show, the fuzzy solutions considered can present a more complex behavior than the deterministic ones. In addition, we show a new interpretation to the membership function of such fuzzy solutions as well as explore some properties of projections of fuzzy solutions. Computational simulations are done to illustrate these asymptotic behaviors.
      PubDate: 2017-12-01
      DOI: 10.1007/s40314-016-0326-8
      Issue No: Vol. 36, No. 4 (2017)
  • Numerical solution of time-fractional Black–Scholes equation
    • Authors: Miglena N. Koleva; Lubin G. Vulkov
      Pages: 1699 - 1715
      Abstract: Abstract In this paper we present a numerical method for a time-fractional Black–Scholes equation, which is used for modeling the fractional structure of the financial market. The method is based on—first, discretization in time and then the weighted finite difference spatial approximation. Some properties of the spatial discretization are studied. The main difficulty (that originates from the non-local structure of the differential operator) of the algorithm is the impossibility to advance layer by layer in time. Numerical experiments are discussed.
      PubDate: 2017-12-01
      DOI: 10.1007/s40314-016-0330-z
      Issue No: Vol. 36, No. 4 (2017)
  • Searching for the optimum value of the smoothing parameter for a radial
           basis function surface with feature area by using the bootstrap method
    • Authors: Khang Jie Liew; Ahmad Ramli; Ahmad Abd. Majid
      Pages: 1717 - 1732
      Abstract: Abstract This paper examines the bootstrap test error estimation of radial basis functions, specifically thin plate spline fitting in surface reconstruction. In the presence of noisy data, instead of an interpolation scheme, the approximation scheme for a thin plate spline is used; therefore, an appropriate value for the smoothing parameter is needed to control the quality of fitting using a set of data points. To find a better smoothing parameter, bootstrap-based test error estimation (the bootstrap leave-one-out error estimator) is applied in searching for the smoothing parameter for a point set model with features. Experimental results demonstrate that the proposed bootstrap leave-one-out error is able to yield the optimum value for the smoothing parameter, which will produce good data approximation and visually pleasing results.
      PubDate: 2017-12-01
      DOI: 10.1007/s40314-016-0332-x
      Issue No: Vol. 36, No. 4 (2017)
  • Numerical study of body shape and wing flexibility in fluid structure
    • Authors: Bogdan Nita; Peter Nolan; Ashwin Vaidya
      Pages: 1733 - 1746
      Abstract: Abstract In this paper, we numerically investigate the impact of body shape and wing orientation upon the flow induced drag forces experienced by a body in its steady state. The current study focuses on simple toy models but derives its motivations from previous reported work on wind-induced drag on birds in flight most of which are experimental in nature. Our numerical results show that body shape/eccentricites, wing length and orientation are all important in determining the forces experienced by a body in a flow. Their geometries and specific features are key to determining the optimal mode of locomotion which is determined by looking at the relationship between drag force, bending behavior versus flow and geometric parameters.
      PubDate: 2017-12-01
      DOI: 10.1007/s40314-016-0333-9
      Issue No: Vol. 36, No. 4 (2017)
  • On sinc discretization method and block-tridiagonal preconditioning for
           second-order differential-algebraic equations
    • Authors: Wendi Bao; Yongzhong Song; Hongmei Shao
      Pages: 1747 - 1782
      Abstract: Abstract In this paper, we obtain a sinc discretization method for solving the boundary value problems of differential-algebraic equations (DAEs) and prove that the discrete solutions converge to the true solutions of the DAEs exponentially. In the process of presenting the solution, we find that the discrete solution is determined by a large and ill-conditioned linear system. To efficiently solve the linear system, we construct block-tridiagonal preconditioners for the iterative methods. Moreover, we derive the bounds for the eigenvalues of the preconditioned matrices. Numerical experiments are given to illustrate the effective performance and applicability of our method.
      PubDate: 2017-12-01
      DOI: 10.1007/s40314-017-0498-x
      Issue No: Vol. 36, No. 4 (2017)
  • A family of second-order fully explicit time integration schemes
    • Authors: Mohammad Rezaiee-Pajand; Mahdi Karimi-Rad
      Abstract: Abstract A new family of fully explicit time integration methods is proposed, which has second-order accuracy for structures with and without damping. Using a diagonal mass matrix, the suggested scheme remains fully explicit not only for structures with a non-diagonal damping matrix, but also when the internal force vector is a nonlinear function of velocity. The present algorithm has an acceptable domain of stability, and it is self-starting. This technique introduces effectively numerical dissipation to suppress the high-frequency spurious modes, while at the same time the lower modes are not affected too much. In addition, numerical dispersion error of the scheme is considerably smaller than that of the central difference method. Solving several linear and nonlinear problems highlights the superior performance of the authors’ approach. Findings demonstrate that solution time for the suggested scheme is much less than that of the central difference technique. The related algorithm can be easily implemented into programs, which already contain the central difference method.
      PubDate: 2017-10-16
      DOI: 10.1007/s40314-017-0520-3
  • A new encoding and switching scheme for chaos-based communication
    • Authors: Renato Candido; Magno T. M. Silva; Marcio Eisencraft
      Abstract: Abstract Many communication systems based on the synchronization of chaotic systems have been proposed as an alternative spread spectrum modulation that improves the level of privacy in data transmission. However, due to the lack of robustness of complete chaotic synchronization, even minor channel impairments are enough to hinder communication. In this paper, we propose a communication system that includes an adaptive equalizer and a switching scheme to alter between a chaos-based modulation and a conventional one, depending on the communication channel conditions. Simulation results show that the switching and equalization algorithms can successfully recover the transmitted sequence in different nonideal scenarios.
      PubDate: 2017-10-12
      DOI: 10.1007/s40314-017-0519-9
  • A state estimation approach based on stochastic expansions
    • Authors: R. H. Lopez; J. E. Souza Cursi; A. G. Carlon
      Abstract: Abstract This paper presents a new approach for state estimation problems. It is based on the representation of random variables using stochastic functions. Its main idea is to expand the state variables in terms of the noise variables of the system, and then estimate the unnoisy value of the state variables by taking the mean value of the stochastic expansion. Moreover, it was shown that in some situations, the proposed approach may be adapted to the determination of the probability distribution of the state noise. For the determination of the coefficients of the expansions, we present three approaches: moment matching (MM), collocation (COL) and variational (VAR). In the numerical analysis section, three examples are analyzed including a discrete linear system, the Influenza in a boarding school and the state estimation problem in the Hodgkin–Huxley’s model. In all these examples, the proposed approach was able to estimate the values of the state variables with precision, i.e., with very low RMS values.
      PubDate: 2017-10-11
      DOI: 10.1007/s40314-017-0515-0
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