18
2008-4889
Iran University of Science & Technology
33
Material Managment
On the property of for a second-order system with zero diagonal coefficient
Aghajani
A.
Roomi
V.
1
1
2007
18
1
1
5
20
04
2009
Abstract: This paper investigates the problem of whether all trajectories of the system and cross the vertical isocline, which is very important for the existence of periodic solutions and oscillation theory. Sufficient conditions are given for all trajectories to cross the vertical isocline.
34
Material Managment
The Sums and Products of Commuting AC-Operators
Ghaemi
M.B
Spain
p.
1
1
2007
18
1
7
11
20
04
2009
Abstract: In this paper, we exhibit new conditions for the sum of two commuting AC-operators to be again an AC-operator. In particular, this is satisfied on Hilbert space when one of them is a scalar-type spectral operator.
35
Material Managment
Time-fixed geometry of 2nd order ODEs
Nadjafikhah
M.
Forough
A.R.
1
1
2007
18
1
13
18
20
04
2009
Abstract : Let be a 2nd order ODE. By Cartan equivalence method, we will study the local equivalence problem under the transformations group of time-fixed coordinates. We are going to solve this problem by an applicable method which has been recognized by R. Gardner, and classify them.
163
Other Related Subject
LEAST – SQUARES METHOD FOR ESTIMATING DIFFUSION COEFFICIENT
Neisy
Abdolsadeh
1
1
2007
18
1
17
19
08
09
2010
Determining the diffusion coefficient based on the solution of the linear inverse problem of the parameter estimation by using the Least-square method is presented. A set of temperature measurements at a single sensor location inside the heat conducting body is required. The corresponding direct problem will be solved by an application of the heat fundamental solution.
36
Material Managment
The Petrov-Galerkin Method and Chebyshev Multiwavelet Basis for Solving Integro-Differential Equations
Maleknejad
k.
Rabbani
M.
1
1
2007
18
1
19
26
20
04
2009
Abstract: There are some methods for solving integro-differential equations. In this work, we solve the general-order Feredholm integro-differential equations. The Petrov-Galerkin method by considering Chebyshev multiwavelet basis is used. By using the orthonormality property of basis elements in discretizing the equation, we can reduce an equation to a linear system with small dimension. For numerical examples, the solutions may be produced with good accuracy, by choosing suitable trial and test spaces in Petrov-Galerkin method.
37
Material Managment
Homotopy Perturbation Applied to System of Feredholm Integral Eqations of the First Kind
Golbabai
A.
Keramati
B.
Arabshahi
M.
1
1
2007
18
1
27
30
20
04
2009
Abstract: In this paper homotopy perturbation is applied to system of linear Fredholm integral equations of the first kind .For these systems, degenerate kernels are considered and in order to avoid successive integrations ,an easy matrix computation is derived for approximating the solution of the problem.
38
Material Managment
Mathematical Modeling and Numerical Investigation of Heat Flux at the External Surface of Cylinder of an Internal Combustion Engine
Shidfar
A.
Garshasbi
M.
1
1
2007
18
1
31
34
20
04
2009
Abstract: This study deals with modeling of heat flux at the external surface of combustion chamber wall in an internal combustion (IC) engine as a function of crank angle. This investigation results in an inverse heat conduction problem in the cylinder wall. Alifanov regularization method is used for solving this inverse problem. This problem study as an optimization problem in which a squared residual unctional is minimized with the conjugate gradient method. This algorithm tests for an example in some cases and numerical results are shown.