فهرست مطالب

International Journal of Industrial Engineering and Productional Research
Volume:18 Issue: 1, Mar 2007

  • تاریخ انتشار: 1378/06/16
  • تعداد عناوین: 6
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  • On the property of for a second-order system with zero diagonal coefficient
    A. Aghajani, V. Roomi Page 1
    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.
  • The Sums and Products of Commuting AC-Operators
    M.B. Ghaemi, P. Spain Page 2
    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.
  • Time-fixed geometry of 2nd order ODEs
    M. Nadjafikhah, A.R. Forough Page 3
    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.
  • Author(s): k. Maleknejad *, M. Rabbani
    K. Maleknejad, M. Rabbani Page 4
    طThere 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.
  • Homotopy Perturbation Applied to System of Feredholm Integral Eqations of the First Kind
    A. Golbabai, B. Keramati, M. Arabshahi Page 5
    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.
  • Mathematical Modeling and Numerical Investigation of Heat Flux at the External Surface of Cylinder of an Internal Combustion Engine
    A. Shidfar, M. Garshasbi Page 6
    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.