2,935 research outputs found
Introduzione a "Parva. Scritti autobiografici di Bartolo Nigrisoli".
No full textIl saggio ricostruisce la formazione letteraria e storica di Bartolo Nigrisoli per chiarire le linee della sua condotta etico-politica, che avrebbe portato al rifiuto del giuramento fascista del 1931
A note on the fractal behavior of hydraulic conductivity and effective porosity for experimental values in a confined aquifer
No full textHydraulic conductivity and effective porosity values for the confined sandy loam aquifer of the Montalto Uffugo (Italy) test field were obtained by laboratory and field measurements; the first ones were carried out on undisturbed soil samples and the others by slug and aquifer tests. A direct simple-scaling analysis was performed for the whole range of measurement and a comparison among the different types of fractal models describing the scale behavior was made. Some indications about the largest pore size to utilize in the fractal models were given. The results obtained for a sandy loam soil show that it is possible to obtain global indications on the behavior of the hydraulic conductivity versus the porosity utilizing a simple scaling relation and a fractal model in coupled manner. © 2013 Samuele De Bartolo et al
p-Laplacian problems with nonlinearities interacting with the spectrum
No full textThe aim of this paper is investigating the existence and the multiplicity of weak solutions of the quasilinear elliptic problem
{-Delta(p)u = g(x, u) in Omega,
u - 0 on partial derivative Omega,
where 1 = 3) with smooth boundary partial derivative Omega and the nonlinearity g behaves as u(p-1) at infinity. The main tools of the proof are some abstract critical point theorems in Bartolo et al. (Nonlinear Anal. 7: 981-1012, 1983), but extended to Banach spaces, and two sequences of quasi-eigenvalues for the p-Laplacian operator as in Candela and Palmieri (Calc. Var. 34: 495-530, 2009), Li and Zhou (J. Lond. Math. Soc. 65: 123-138, 2002)
Prepoznavanje in obvladovanje stresa na delovnem mestu v oddelku komerciala : diplomsko delo visokošolskega strokovnega študija
No full textRemarks on some variational problems on non-complete manifolds
No full textWe shall review recent results obtained in the study of some periodic variational problems on Riemannian and Lorentzian manifolds with boundary. Firstly we shall analyze the existence. of closed geodesics on a Riemannian manifold (M, (R))Then we shall deal respectively with periodic trajectories and periodic trajectories under a vectorial potential on stationary Lorentz manifolds. Finally, we discuss the different hypotheses on the boundary, and state some open questions
Periodic trajectories on stationary Lorentzian manifolds
No full textAn existence and multiplicity result for periodic trajectories on stationary Lorentzian manifolds, possibly with boundary, whose proof is based on a Morse theory approach is presented. A Lorentzian manifold is a smooth connected finite-dimensional manifold M equipped with a (0,2) tensor field g such that for any z∈M g(z) [·,·] is a nondegenerate symmetric bilinear form on the tangent space TzM having exactly one negative eigenvalue. Moreover, relativistic spacetimes are a particular class of Lorentzian manifolds of dimension fou
Bartolo da Sassoferrato
No full textSi offre una sintetica esposizione dei dati biografici e dell'attività scientifica di Bartolo da Sassoferrato, riconsiderando brevemente, alla luce degli studi più recenti, la sua figura e la sua opera
Recensione a M. Di Bartolo, Einsicht. La costruzione del noetico in Edmund Husserl, Il Poligrafo, Padova 2006
No full textRecensione al libro di M. Di Bartolo, Einsicht. La costruzione del noetico in Edmund Husserl, Il Poligrafo, Padova 200
Trajectories connecting two submanifolds on non--complete Lorentzian manifolds
No full textThis article presents existence and multiplicity results for orthog-
onal trajectories joining two submanifolds Σ1 and Σ2 of a static space-time
manifold M under the action of gravitational and electromagnetic vector po-
tential. The main technical difficulties are because M may not be complete
and Σ1 , Σ2 may not be compact. Hence, a suitable convexity assumption and
hypotheses at infinity are needed. These assumptions are widely discussed in
terms of the electric and magnetic vector fields naturally associated. Then,
these vector fields become relevant from both their physical interpretation and
the mathematical gauge invariance of the equation of the trajectories
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