Articolo in rivista
Finite difference solution of Euler equations arising in variational image segmentation |
This paper deals with finite-difference approximations of Euler equations arising in the variational formulation of image segmentation problems. We illustrate how they can be defined by the following steps: (a) definition of the minimization problem for the Mumford-Shah functional (MSf), (b)… | |
The general relativistic Poynting-Robertson effect II: A photon flux with nonzero angular momentum |
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On a class of parameters estimators in linear models dominating the least squares one |
The estimation of parameters in a linear model is considered under the hypothesis that the noise, with finite second order statistics, can be represented by random coefficients in a given deterministic basis. An extended underdetermined design matrix is then formed, and the estimator of the… | |
On the reachability of quantized control systems |
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On the complexity of path problems in properly colored directed graphs |
We address the complexity class of several problems related to finding a path in a properly colored directed graph. A properly colored graph is defined as a graph G whose vertex set is partitioned into X(G) stable subsets, where X(G) denotes the chromatic number of G. We show that to find a simple… | |
Spin-geodesic deviations in the Kerr spacetime |
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Computing the Jordan structure of an eigenvalue |
In this paper we revisit the problem of finding an orthogonal similarity transformation that puts an $n\times n$ matrix $A$ in a block upper-triangular form that reveals its Jordan structure at a particular eigenvalue $\lambda_0$. The obtained form in fact reveals the dimensions of the null spaces… | |
Energy dissipation and permeability in porous media |
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Momentum recoil in the relativistic two-body problem: Higher-order tails |
In the description of the relativistic two-body interaction, together with the effects of energy and angular momentum losses due to the emission of gravitational radiation, one has to take into account also the loss of linear momentum, which is responsible for the recoil of the center-of-mass of… | |
Numerical study of the appearance of singularitiesin ferromagnets |
