eng
University of Guilan
Journal of Mathematical Modeling
2345-394X
2382-9869
2016-08-01
4
1
1
18
1571
مقاله پژوهشی
Approximation of stochastic advection diffusion equations with finite difference scheme
Mehran Namjoo
namjoo@vru.ac.ir
1
Ali Mohebbian
a.mohebbiyan@stu.vru.ac.ir
2
School of Mathematical Sciences, Vali-e-Asr University of Rafsanjan, Rafsanjan, Iran
School of Mathematical Sciences, Vali-e-Asr University of Rafsanjan, Rafsanjan, Iran
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.
https://jmm.guilan.ac.ir/article_1571_98967e2a794e3be26008058a975a68bd.pdf
stochastic partial differential equations
Consistency
Stability
Convergence
eng
University of Guilan
Journal of Mathematical Modeling
2345-394X
2382-9869
2016-08-01
4
1
19
34
1804
مقاله پژوهشی
The exponential functions of central-symmetric $X$-form matrices
Amir Sadeghi
drsadeghi.iau@gmail.com
1
Maryam Shams Solary
shamssolary@gmail.com
2
Department of Mathematics, Islamic Azad University, Robat Karim Branch, Tehran, Iran
Department of Mathematics, Payame Noor University, P.O. Box 19395-3697, Tehran, Iran
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.
https://jmm.guilan.ac.ir/article_1804_9d050861700cfaedf44b846aa4fcaecb.pdf
central-symmetric matrix
matrix function
matrix exponential
Gamma and Beta matrix functions
eng
University of Guilan
Journal of Mathematical Modeling
2345-394X
2382-9869
2016-08-01
4
1
35
58
1805
مقاله پژوهشی
A path following interior-point algorithm for semidefinite optimization problem based on new kernel function
El Amir Djeffal
djeffal_elamir@yahoo.fr
1
Lakhdar Djeffal
lakdar_djeffal@yahoo.fr
2
Department of Mathematics, University of Batna 2, Batna, Algeria
Department of Mathematics, University of Batna 2, Batna, Algeria
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 $m>4$.
https://jmm.guilan.ac.ir/article_1805_783e5a298d09d5f817ee51668fdce93b.pdf
quadratic programming
convex nonlinear programming
interior point methods
eng
University of Guilan
Journal of Mathematical Modeling
2345-394X
2382-9869
2016-08-01
4
1
59
78
1806
مقاله پژوهشی
Modeling and analysis of a three-component piezoelectric force sensor
Fu Shao
fu.shao@mail.utoronto.ca
1
Department of Mechanical and Industrial Engineering, University of Toronto, Toronto, Canada
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.
https://jmm.guilan.ac.ir/article_1806_d5d1883675b01e114f61b18a8ebbdff7.pdf
piezoelectric
force sensor
nonlinear vibration analysis
weakly nonlinear electroelasticity
eng
University of Guilan
Journal of Mathematical Modeling
2345-394X
2382-9869
2016-08-01
4
1
79
102
1807
مقاله پژوهشی
Numerical method for singularly perturbed fourth order ordinary differential equations of convection-diffusion type
Joseph Stalin Christy Roja
jchristyrojaa@gmail.com
1
Ayyadurai Tamilselvan
mathats@bdu.ac.in
2
St. Joseph's college, Tamilnadu, India
Bharathidasan University, Tamilnadu, India
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.
https://jmm.guilan.ac.ir/article_1807_e5e9cdf91b6a70678c36985fb65a8905.pdf
singularly perturbed problems
fourth order ordinary differential equations
boundary value technique
asymptotic expansion approximation
shooting method
finite difference scheme
parallel computation
eng
University of Guilan
Journal of Mathematical Modeling
2345-394X
2382-9869
2016-08-01
4
1
103
115
1808
مقاله پژوهشی
Dynamics of an eco-epidemic model with stage structure for predator
Debasis Mukherjee
mukherjee1961@gmail.com
1
Department of Mathematics, Vivekananda College, Thakurpukur, Kolkata-700063, India
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.
https://jmm.guilan.ac.ir/article_1808_d9fed3af311cbb7b761b36f93ad13bc4.pdf
prey-predator model
stage structure
Stability
Hopf bifurcation