2015
3
1
1
98
SDO relaxation approach to fractional quadratic minimization with one quadratic constraint
2
2
In this paper, we study the problem of minimizing the ratio of two quadratic functions subject to a quadratic constraint. First we introduce a parametric equivalent of the problem. Then a bisection and a generalized Newtonbased method algorithms are presented to solve it. In order to solve the quadratically constrained quadratic minimization problem within both algorithms, a semidefinite optimization relaxation approach is presented. Finally, two set of examples are presented to compare the performance of algorithms.
1

1
13


Maziar
Salahi
Faculty of Mathematical Sciences, University of Guilan,Rasht, Iran
Faculty of Mathematical Sciences, University
Iran
salahim@guilan.ac.ir


Arezo
Zare
Faculty of Mathematical Sciences, University of Guilan,Rasht, Iran
Faculty of Mathematical Sciences, University
Iran
ze.arezou@gmail.com
Fractional quadratic optimization
nonconvex problem
convex optimization
semidefinite optimization
Dynamical behavior and synchronization of hyperchaotic complex Tsystem
2
2
In this paper, we introduce a new hyperchaotic complex Tsystem. This system has complex nonlinear behavior which we study its dynamical properties including invariance, equilibria and their stability, Lyapunov exponents, bifurcation, chaotic behavior and chaotic attractors as well as necessary conditions for this system to generate chaos. We discuss the synchronization with certain and uncertain parameters via adaptive control. For synchronization, we use less controllers than the dimension of the proposed system. Also, we prove that the error system is asymptotically stable by using a Lyapunov function. Numerical simulations are computed to check the analytical expressions.
1

15
32


Hossein
Kheiri
Faculty of Mathematical Sciences, University of Tabriz, Tabriz, Iran
Faculty of Mathematical Sciences, University
Iran
hkheiri@tabrizu.ac.ir


Bashir
Naderi
Department of Mathematics, Payame Noor University, Iran
Department of Mathematics, Payame Noor University,
Iran
b_naderi@pnu.ac.ir
Lyapunov stability
Synchronization
Chaos
Adaptive control
An efficient numerical method for singularly perturbed second order ordinary differential equation
2
2
In this paper an exponentially fitted finite difference method is presented for solving singularly perturbed twopoint boundary value problems with the boundary layer. A fitting factor is introduced and the model equation is discretized by a finite difference scheme on an uniform mesh. Thomas algorithm is used to solve the tridiagonal system. The stability of the algorithm is investigated. It is shown that the proposed technique is of first order accurate and the error constant is independent of the perturbation parameter. Several problems are solved and numerical results are presented to support the theoretical error bounds established.
1

33
48


Jugal
Mohapatra
Department of Mathematics, National Institute of Technology Rourkela, India
Department of Mathematics, National Institute
Iran
jugal@nitrkl.ac.in


Manas kumar
Mahalik
Department of Mathematics, National Institute of Technology Rourkela, India
Department of Mathematics, National Institute
Iran
513ma1002@nitrkl.ac.in
Singular perturbation problems
boundary layers
Thomas algorithm
exponential fitting factor
uniform convergence
Hydromagnetic Couette flow of classII and heat transfer through a porous medium in a rotating system with Hall effects
2
2
Steady hydromagnetic Couette flow of classII of a viscous, incompressible and electrically conducting fluid through a porous medium in a rotating system taking Hall current into account is investigated. Heat transfer characteristics of the fluid flow are considered taking viscous and Joule dissipations into account. It is noticed that there exists flow separation at the moving plate in the secondary flow direction on increasing either rotation parameter $K^2$ when Hall current parameter $m = 0.5$ or $m$ when $K^2 = 7$. Also there exists flow separation at the moving plate in the secondary flow direction on increasing either magnetic parameter $M^2$ for every value of porosity parameter $K_1$ or $K_1$ when $M^2 = 15$.
1

49
75


Gauri
Shanker Seth
Department of Applied Mathematics, Indian School of Mines, Dhanbad826004, India
Department of Applied Mathematics, Indian
Iran
gsseth ism@yahoo.com


Prashanta Kumar
Mandal
Department of Applied Mathematics, Indian School of Mines, Dhanbad826004, India
Department of Applied Mathematics, Indian
Iran
ism.prashanta@gmail.com


Rohit
Sharma
Department of Applied Mathematics, Indian School of Mines, Dhanbad826004, India
Department of Applied Mathematics, Indian
Iran
rohit.iitg08@gmail.com
Couette flow of classII
Porous medium
Coriolis force
Hall current
viscous and Joule dissipations
Bernoulli matrix approach for matrix differential models of firstorder
2
2
The current paper contributes a novel framework for solving a class of linear matrix differential equations. To do so, the operational matrix of the derivative based on the shifted Bernoulli polynomials together with the collocation method are exploited to reduce the main problem to system of linear matrix equations. An error estimation of presented method is provided. Numerical experiments are reported to demonstrate the applicably and efficiency of the propounded technique.
1

77
89


Ahmad
Golbabai
School of Mathematics, Iran University of Science and Technology, Tehran, Iran
School of Mathematics, Iran University of
Iran
golbabai@iust.ac.ir


Samaneh
Panjeh Ali Beik
School of Mathematics, Iran University of Science and Technology, Tehran, Iran
School of Mathematics, Iran University of
Iran
panjehali@iust.ac.ir
Linear matrix differential equation
Bernoulli polynomials
operational matrix of derivative
error estimation
Determining the order of minimal realization of descriptor systems without use of the Weierstrass canonical form
2
2
A common method to determine the order of minimal realization of a continuous linear time invariant descriptor system is to decompose it into slow and fast subsystems using the Weierstrass canonical form. The Weierstrass decomposition should be avoided because it is generally an illconditioned problem that requires many complex calculations especially for highdimensional systems. The present study finds the order of minimal realization of a continuous linear time invariant descriptor system without use of the Weierstrass canonical form.
1

91
101


Kamele
Nassiri Pirbazari
Faculty of Mathematical Sciences, University of Guilan, Rasht, Iran
Faculty of Mathematical Sciences, University
Iran
knasiri@guilan.ac.ir


Mehdi
Azari
Faculty of Mathematical Sciences, University of Guilan, Rasht, Iran
Faculty of Mathematical Sciences, University
Iran
mr.mehdiazari@yahoo.com
Descriptor system
minimal realization
Weierstrass canonical form