Browsing by Subject "Mathematical techniques"
Now showing items 17 of 7

Article
Classification of noether symmetries for Lagrangians with three degrees of freedom
(2004)The noether symmetries of the EulerLagrange equations for a Hamiltonian system with three degrees were classified. All groups were classified that appeared as symmetries of a general Hamiltonians system of n degrees of ...

Article
A Legendre spectral Galerkin method for the biharmonic Dirichlet problem
(2001)A Legendre spectral Galerkin method is presented for the solution of the biharmonic Dirichlet problem on a square. The solution and its Laplacian are approximated using the set of basis functions suggested by Shen, which ...

Article
The method of fundamental solutions for the identification of a soundsoft obstacle in inverse acoustic scattering
(2012)In this paper we propose a simple meshless method of fundamental solutions (MFS) for detecting a soundsoft scatterer embedded in a host acoustic homogeneous medium from the measurement of the farfield pattern of the ...

Article
Modelling interventions in INGARCH processes
(2016)We study different approaches for modelling intervention effects in time series of counts, focusing on the socalled integervalued GARCH models. A previous study treated a model where an intervention affects the nonobservable ...

Article
Newtonian flow in a triangular duct with slip at the wall
(2013)We consider the Newtonian Poiseuille flow in a tube whose crosssection is an equilateral triangle. It is assumed that boundary slip occurs only above a critical value of the wall shear stress, namely the slip yield stress. ...

Article
Newtonian Poiseuille flows with slip and nonzero slip yield stress
(2013)The Newtonian Poiseuille flow is considered for various geometries, under the assumption that wall slip occurs above a critical value of the wall shear stress known as, the slip yield stress. In the axisymmetric and planar ...

Article
The Toda lattice is superintegrable
(2006)We prove that the classical, nonperiodic Toda lattice is superintegrable. In other words, we show that it possesses 2 N  1 independent constants of motion, where N is the number of degrees of freedom. The main ingredient ...