Browsing Τμήμα Μαθηματικών και Στατιστικής / Department of Mathematics and Statistics by Title
Now showing items 187-206 of 1633
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Article
A C1-conforming hp finite element method for fourth order singularly perturbed boundary value problems
(2016)We consider a fourth order singularly perturbed boundary value problem (BVP) in one-dimension and the approximation of its solution by the hp version of the Finite Element Method (FEM). The given problem's boundary conditions ...
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The calibration method for the Thermal Insulation functional
(EDP Sciences, 2022)We provide minimality criteria by construction of calibrations for functionals arising in the theory of thermal insulation.
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Article
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Article
Centered densities on Lie groups of polynomial volume growth
(2002)We study the asymptotic behavior of the convolution powers φ*n =φ*φ*⋯φ* of a centered density φ on a connected Lie group G of polynomial volume growth. The main tool is a Harnack inequality which is proved by using ideas ...
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Article
Centered sub-Laplacians and densities in Lie groups of polynomial volume growth
(1998)We prove a Harnack inequality on connected Lie groups of polynomial volume growth. We use this inequality to study the large time behavior of the heat kernels associated to centered sub-Laplacians. Thus, we obtain Gaussian ...
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Article
Central limit theorem for dependent multidimensionally indexed random variables
(2003)We consider dependent multidimensionally indexed random variables whose dependence is determined by the distance of their indices. This provides a generalization of the well-known notion of m-dependence. For the partial ...
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Conference Object
Centralized, decentralized, and overlapping control designs for a segmented telescope
(IEEE, 1999)The accurate control of the segments of large segmented telescopes to achieve the desired shape could open the way for the construction of much larger telescopes with much better capabilities. In this article, we consider ...
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Conference Object
Cessation flows of bingham plastics with slip at the wall
(National Technical University of Athens, 2013)We use finite elements in space and a fully implicit scheme in time in order to solve the cessation of axisymmetric Poiseuille flow of a Bingham plastic under the assumption that slip occurs along the wall. The Papanastasiou ...
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Article
Cessation of annular Poiseuille flows of Bingham plastics
(2007)We numerically solve the cessation of the annular Poiseuille flow of Bingham plastics for various values of the diameter ratio, using the regularized constitutive equation proposed by Papanastasiou and employing finite ...
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Article
Cessation of Couette and Poiseuille flows of a Bingham plastic and finite stopping times
(2005)We solve the one-dimensional cessation Couette and Poiseuille flows of a Bingham plastic using the regularized constitutive equation proposed by Papanastasiou and employing finite elements in space and a fully implicit ...
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Article
Cessation of Newtonian circular and plane Couette flows with wall slip and non-zero slip yield stress
(2017)We solve analytically the cessation flows of a Newtonian fluid in circular and plane Couette geometries assuming that wall slip occurs provided that the wall shear stress exceeds a critical threshold, the slip yield stress. ...
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Article
Cessation of the lid-driven cavity flow of Newtonian and Bingham fluids
(2016)We provide benchmark results for a transient variant of the lid-driven cavity problem, where the lid motion is suddenly stopped and the flow is left to decay under the action of viscosity. Results include Newtonian as well ...
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Article
Cessation of viscoplastic Poiseuille flow in a square duct with wall slip
(2015)We solve numerically the cessation of the pressure-driven Poiseuille flow of a Bingham plastic under the assumption that slip occurs along the wall following a generalized Navier-slip law involving a non-zero slip yield ...
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Article
Cessation of viscoplastic Poiseuille flow with wall slip
(2014)We solve numerically the cessation of axisymmetric Poiseuille flow of a Herschel-Bulkley fluid under the assumption that slip occurs along the wall. The Papanastasiou regularization of the constitutive equation is employed. ...
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Conference Object
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Article
CHARACTERISATIONS OF SOME INCOME DISTRIBUTIONS BASED ON MULTIPLICATIVE DAMAGE MODELS
(1995)This paper characterises the Pareto and scaled beta distributions within the context of multiplicative damage and generating models. The results obtained allow the destructive or generating mechanism to have more general ...
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Book
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Article
A characterization of the negative binomial distribution via α -monotonicity
(1999)We obtain a characterization of the negative binomial distribution by using arguments based on power-series families of distributions for α-monotone random variables. © 1999 Elsevier Science B.V.
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Article
Characterizations of discrete distributions using the Rao-Rubin condition
(2005)Consider the multivariate splitting model N = N1 + ⋯ + Nk, where N1,..., Nk, k ≥ 3, are arbitrary (not necessarily independent) random variables (r.v.'s) taking values in ℕ = {0, 1,...}, and assume that the Rao-Rubin ...
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Article
Characterizations of probability distributions based on discrete p-monotonicity
(1995)In this paper, a general characterization of a class of discrete self-decomposable distributions based on discrete p-monotonicity is obtained. This result can be thought as the discrete version of an earlier result due to ...