@article { author = {Haq, Fazal and Shah, Kamal and Rahman, Ghaus-UR- and Shahzad, Muhammad}, title = {Numerical analysis of fractional order model of HIV-1 infection of CD4+ T-cells}, journal = {Computational Methods for Differential Equations}, volume = {5}, number = {1}, pages = {1-11}, year = {2017}, publisher = {University of Tabriz}, issn = {2345-3982}, eissn = {2383-2533}, doi = {}, abstract = {In this article, we present a fractional order HIV-1 infection model of CD4+ T-cell. We analyze the effect of the changing the average number of the viral particle N with initial conditions of the presented model. The Laplace Adomian decomposition method is applying to check the analytical solution of the problem. We obtain the solutions of the fractional order HIV-1 model in the form of infinite series. The concerned series rapidly converges to its exact value. Moreover, we compare our results with the results obtained by Runge-Kutta method in case of integer order derivative.}, keywords = {Infectious diseases models, Fractional Derivatives, Laplace transform , Adomian decomposi- tion method,Analytical solution}, url = {https://cmde.tabrizu.ac.ir/article_5825.html}, eprint = {https://cmde.tabrizu.ac.ir/article_5825_f4866fc1855d93e48a17375f970401ef.pdf} } @article { author = {Alikhani, Robab}, title = {Interval fractional integrodifferential equations without singular kernel by fixed point in partially ordered sets}, journal = {Computational Methods for Differential Equations}, volume = {5}, number = {1}, pages = {12-29}, year = {2017}, publisher = {University of Tabriz}, issn = {2345-3982}, eissn = {2383-2533}, doi = {}, abstract = {This work is devoted to the study of global solution for initial value problem of interval fractional integrodifferential equations involving Caputo-Fabrizio fractional derivative without singular kernel admitting only the existence of a lower solution or an upper solution. Our method is based on fixed point in partially ordered sets. In this study, we guaranty the existence of special kind of interval H-difference that we will be faced it under weak conditions. The method is illustrated by an examples.}, keywords = {Interval fractional integrodifferential equations,Caputo-Fabrizio fractional derivative,Method of upper or lower solutions,Fixed point in partially ordered sets}, url = {https://cmde.tabrizu.ac.ir/article_5832.html}, eprint = {https://cmde.tabrizu.ac.ir/article_5832_a153da52e918984455148c1c2bcc3054.pdf} } @article { author = {Dastranj, Elham and Hejazi, S. Reza}, title = {New Solutions for Fokker-Plank Equation of‎ ‎Special Stochastic Process via Lie Point Symmetries}, journal = {Computational Methods for Differential Equations}, volume = {5}, number = {1}, pages = {30-42}, year = {2017}, publisher = {University of Tabriz}, issn = {2345-3982}, eissn = {2383-2533}, doi = {}, abstract = {‎In this paper Lie symmetry analysis is applied in order to find new solutions for Fokker Plank equation of Ornstein-Uhlenbeck process‎. ‎This analysis classifies the solutions format of the Fokker Plank equation by using the Lie algebra of the symmetries of our considered stochastic process‎.}, keywords = {Financial market‎,‎Ornstein-Uhlenbeck‎,‎Lie algebra symmetries‎,‎Fokker-Plank}, url = {https://cmde.tabrizu.ac.ir/article_5860.html}, eprint = {https://cmde.tabrizu.ac.ir/article_5860_0619691dc5e6d56d4bebd5478457bf27.pdf} } @article { author = {Najafi, Ramin and Nemati Saray, Behzad}, title = {Numerical solution of the forced Duffing equations‎ ‎ using Legendre multiwavelets}, journal = {Computational Methods for Differential Equations}, volume = {5}, number = {1}, pages = {43-55}, year = {2017}, publisher = {University of Tabriz}, issn = {2345-3982}, eissn = {2383-2533}, doi = {}, abstract = {‎A numerical technique based on the collocation method using Legendre multiwavelets are‎ ‎presented for the solution of forced Duffing equation‎. ‎The operational matrix of integration for ‎Legendre multiwavelets is presented and is utilized to reduce the solution of Duffing equation‎ ‎to the solution of linear algebraic equations‎. ‎Illustrative examples are included to demonstrate‎ ‎the validity and applicability of the new technique.‎}, keywords = {‎Forced Duffing equations‎,‎Multiwavelet‎,‎Operational matrix of integration‎,‎Collocation‎ ‎method}, url = {https://cmde.tabrizu.ac.ir/article_5861.html}, eprint = {https://cmde.tabrizu.ac.ir/article_5861_ca3f0ed7de5017b87aa945ff661cf787.pdf} } @article { author = {Azizi, Mohammad-Reza and Khani, Ali}, title = {Sinc operational matrix method for solving the Bagley-Torvik equation}, journal = {Computational Methods for Differential Equations}, volume = {5}, number = {1}, pages = {56-66}, year = {2017}, publisher = {University of Tabriz}, issn = {2345-3982}, eissn = {2383-2533}, doi = {}, abstract = {The aim of this paper is to present a new numerical method for solving the Bagley-Torvik equation. This equation has an important role in fractional calculus. The fractional derivatives are described based on the Caputo sense. Some properties of the sinc functions required for our subsequent development are given and are utilized to reduce the computation of solution of the Bagley-Torvik equation to some algebraic equations. It is well known that the sinc procedure converges to the solution at an exponential rate. Numerical examples are included to demonstrate the validity and applicability of the technique.}, keywords = {Bagley-Torvik equation,Sinc functions,Operational matrix,Caputo derivative,Numerical methods}, url = {https://cmde.tabrizu.ac.ir/article_5868.html}, eprint = {https://cmde.tabrizu.ac.ir/article_5868_fdcacac6135f0bb82c1b80f8d91e4a6b.pdf} } @article { author = {Ahmadi Darani, Mohammadreza and Saadatmandi, Abbas}, title = {The operational matrix of fractional derivative of the fractional-order Chebyshev functions and its applications}, journal = {Computational Methods for Differential Equations}, volume = {5}, number = {1}, pages = {67-87}, year = {2017}, publisher = {University of Tabriz}, issn = {2345-3982}, eissn = {2383-2533}, doi = {}, abstract = {In this paper, we introduce a family of fractional-order Chebyshev functions based on the classical Chebyshev polynomials. We calculate and derive the operational matrix of derivative of fractional order $gamma$ in the Caputo sense using the fractional-order Chebyshev functions. This matrix yields to low computational cost of numerical solution of fractional order differential equations to the solution of a system of algebraic equations. Several numerical examples are given to illustrate the accuracy of our method. The results obtained, are in full agreement with the analytical solutions and numerical results presented by some previous works.}, keywords = {Chebyshev polynomials,orthogonal system,fractional differential equation,fractional-order Chebyshev functions,Operational matrix}, url = {https://cmde.tabrizu.ac.ir/article_5902.html}, eprint = {https://cmde.tabrizu.ac.ir/article_5902_97563e2dfae2abcda93be4bd14ba9e1c.pdf} }