University of Guilan
Journal of Mathematical Modeling
2345-394X
2382-9869
4
1
2016
08
01
Approximation of stochastic advection diffusion equations with finite difference scheme
1
18
EN
Mehran
Namjoo
School of Mathematical Sciences, Vali-e-Asr University of Rafsanjan, Rafsanjan, Iran
namjoo@vru.ac.ir
Ali
Mohebbian
School of Mathematical Sciences, Vali-e-Asr University of Rafsanjan, Rafsanjan, Iran
a.mohebbiyan@stu.vru.ac.ir
In this paper, a high-order and conditionally stable stochastic difference scheme is proposed for the numerical solution of $rm Ithat{o}$ stochastic advection diffusion equation with one dimensional white noise process. We applied a finite difference approximation of fourth-order for discretizing space spatial derivative of this equation. The main properties of deterministic difference schemes, i.e. consistency, stability and convergence, are developed for the stochastic case. It is shown through analysis that the proposed scheme has these properties. Numerical results are given to demonstrate the computational efficiency of the stochastic scheme.
stochastic partial differential equations,consistency,stability,convergence
http://jmm.guilan.ac.ir/article_1571.html
http://jmm.guilan.ac.ir/article_1571_98967e2a794e3be26008058a975a68bd.pdf
University of Guilan
Journal of Mathematical Modeling
2345-394X
2382-9869
4
1
2016
08
01
The exponential functions of central-symmetric $X$-form matrices
19
34
EN
Amir
Sadeghi
Department of Mathematics, Islamic Azad University, Robat Karim Branch, Tehran, Iran
drsadeghi.iau@gmail.com
Maryam
Shams Solary
Department of Mathematics, Payame Noor University, P.O. Box 19395-3697, Tehran, Iran
shamssolary@gmail.com
It is well known that the matrix exponential function has practical applications in engineering and applied sciences. In this paper, we present some new explicit identities to the exponential functions of a special class of matrices that are known as central-symmetric $X$-form. For instance, $e^{mathbf{A}t}$, $t^{mathbf{A}}$ and $a^{mathbf{A}t}$ will be evaluated by the new formulas in this particular structure. Moreover, upper bounds for the explicit relations will be given via subordinate matrix norms. Eventually, some numerical illustrations and applications are also adapted.
central-symmetric matrix,matrix function,matrix exponential,Gamma and Beta matrix functions
http://jmm.guilan.ac.ir/article_1804.html
http://jmm.guilan.ac.ir/article_1804_9d050861700cfaedf44b846aa4fcaecb.pdf
University of Guilan
Journal of Mathematical Modeling
2345-394X
2382-9869
4
1
2016
08
01
A path following interior-point algorithm for semidefinite optimization problem based on new kernel function
35
58
EN
El Amir
Djeffal
Department of Mathematics, University of Batna 2, Batna, Algeria
djeffal_elamir@yahoo.fr
Lakhdar
Djeffal
Department of Mathematics, University of Batna 2, Batna, Algeria
lakdar_djeffal@yahoo.fr
In this paper, we deal to obtain some new complexity results for solving semidefinite optimization (SDO) problem by interior-point methods (IPMs). We define a new proximity function for the SDO by a new kernel function. Furthermore we formulate an algorithm for a primal dual interior-point method (IPM) for the SDO by using the proximity function and give its complexity analysis, and then we show that the worst-case iteration bound for our IPM is $O(6(m+1)^{frac{3m+4}{2(m+1)}}Psi _{0}^{frac{m+2}{2(m+1)}}frac{1}{theta }log frac{nmu ^{0}}{varepsilon })$, where $m>4$.
quadratic programming,convex nonlinear programming,interior point methods
http://jmm.guilan.ac.ir/article_1805.html
http://jmm.guilan.ac.ir/article_1805_783e5a298d09d5f817ee51668fdce93b.pdf
University of Guilan
Journal of Mathematical Modeling
2345-394X
2382-9869
4
1
2016
08
01
Modeling and analysis of a three-component piezoelectric force sensor
59
78
EN
Fu
Shao
Department of Mechanical and Industrial Engineering, University of Toronto, Toronto, Canada
fu.shao@mail.utoronto.ca
This paper presents a mathematical model for the vibration analysis of a three-component piezoelectric force sensor. The cubic theory of weakly nonlinear electroelasticity is applied to the model for describing the electromechanical coupling effect in the piezoelectric sensing elements which operate in thickness-shear and thickness-stretch vibration modes. Hamilton's principle is used to derive motion and charge equations for the vibration analysis. The model can predict the performance of the force sensor for use in proposed cutting force measurement.
piezoelectric,force sensor,nonlinear vibration analysis,weakly nonlinear electroelasticity
http://jmm.guilan.ac.ir/article_1806.html
http://jmm.guilan.ac.ir/article_1806_d5d1883675b01e114f61b18a8ebbdff7.pdf
University of Guilan
Journal of Mathematical Modeling
2345-394X
2382-9869
4
1
2016
08
01
Numerical method for singularly perturbed fourth order ordinary differential equations of convection-diffusion type
79
102
EN
Joseph
Stalin Christy Roja
St. Joseph's college, Tamilnadu, India
jchristyrojaa@gmail.com
Ayyadurai
Tamilselvan
Bharathidasan University, Tamilnadu, India
mathats@bdu.ac.in
In this paper, we have proposed a numerical method for singularly perturbed fourth order ordinary differential equations of convection-diffusion type. The numerical method combines boundary value technique, asymptotic expansion approximation, shooting method and finite difference method. In order to get a numerical solution for the derivative of the solution, the given interval is divided into two subintervals called inner region (boundary layer region) and outer region. The shooting method is applied to inner region whereas for the outer region, standard finite difference method is applied. Necessary error estimates are derived. Computational efficiency and accuracy are verified through numerical examples.
singularly perturbed problems,fourth order ordinary differential equations,boundary value technique,asymptotic expansion approximation,shooting method,finite difference scheme,parallel computation
http://jmm.guilan.ac.ir/article_1807.html
http://jmm.guilan.ac.ir/article_1807_e5e9cdf91b6a70678c36985fb65a8905.pdf
University of Guilan
Journal of Mathematical Modeling
2345-394X
2382-9869
4
1
2016
08
01
Dynamics of an eco-epidemic model with stage structure for predator
103
115
EN
Debasis
Mukherjee
Department of Mathematics, Vivekananda College, Thakurpukur, Kolkata-700063, India
mukherjee1961@gmail.com
The predator-prey model with stage structure for predator is generalized in the context of ecoepidemiology, where the prey population is infected by a microparasite and the predator completely avoids consuming the infected prey. The intraspecific competition of infected prey is considered. All the equilibria are characterized and the existence of a Hopf bifurcation at the coexistence equilibrium is shown. Numerical simulations are carried out to illustrate the obtained results.
prey-predator model,stage structure,stability,Hopf bifurcation
http://jmm.guilan.ac.ir/article_1808.html
http://jmm.guilan.ac.ir/article_1808_d9fed3af311cbb7b761b36f93ad13bc4.pdf