2,651 research outputs found
Le feste anconitane nel settembre dell'anno MDCCCXLI per la faustissima venuta e dimora in Ancona di nostro signore Gregorio XVI, pontefice felicemente regnante /
No full textThe plates are lithographed by Gionantonj in Ancona (signed: Lit. Giovantonj in Ancona). Included are: frontispiece portrait of the pope (signed: F. Maggi); and 10 plates signed: "M. Bevilacqua Ing. inv., "L. Scarpetti dis", "F. Maggi dis.", "M. Badioli dis.", "Vin.zo Podesti dip.", "A. Bedetti dis.", "Ing. Pont. dis.", "L.B. dis. Lit."; "L.M. dis. Lit."; "G. C.te Bonarelli inv.", "M.B."; and "M. Livoni Ing. inv.".Includes description of fireworks.Mode of access: Internet
On Kolmogorov entropy compactness estimates for scalar conservation laws without uniform convexity
No full textIn the case of scalar conservation laws u_t +f(u)_x = 0; t > 0; x in R, with uniformly strictly convex flux, quantitative compactness estimates-in terms of Kolmogorov entropy in L^1_{loc}- were established in [C. De Lellis and F. Golse, Comm. Pure Appl. Math., 58 (2005), pp. 989{998; F. Ancona, O. Glass, and K. T. Nguyen, Comm. Pure Appl. Math., 65 (2012), pp. 1303{1329] for sets of entropy weak solutions evaluated at a fixed time t > 0, whose initial data have a uniformly bounded support and vary in a bounded subset of L1. These estimates reflct the irreversibility features of entropy weak discontinuous solutions of these nonlinear equations. We provide here an extension of such estimates to the case of scalar conservation laws with a smooth flux function f that either is strictly (but not necessarily uniformly) convex or has a single inflection point with a polynomial degeneracy
Marsilio da Padova
No full textIl volume, inserito nella collana diretta da Franco Todescan “Lex naturalis. Testi scelti di filosofia del diritto medievale”, presenta una sezione antologica di testi marsiliani introdotta da uno studio di Elvio Ancona sulla letteratura critica che nell’ultimo cinquantennio si è occupata del pensiero del Patavino. Lo studio bibliografico, in particolare, nella rivisitazione delle più recenti interpretazioni del Defensor pacis, trova occasione per interrogarsi su alcuni problemi giusfilosofici fondamentali che in quell’opera furono sollevati e sulle soluzioni che vi furono prospettate
On the asymptotic stabilization of the hyperelastic-rod wave equation
No full textWe discuss the problem of asymptotic stabilization of the hyper\-elastic-rod wave equation on the real line
\partial_t u-\partial_{txx}^3 u+3u \partial_x u=\gamma\left(2\partial_x u\, \partial_{xx}^2 u+u\, \partial_{xxx}^3 u\right),\quad t > 0,\>\>x\in \mathbb{R}.
We consider the equation with an additional force term of the form f:H^1(\mathbb{R})\to H^{-1}(\mathbb{R}),\, f[u]=-\lambda(u-\partial_{xx}^2 u),
for some \lambda>0. We resume the results of [F. Ancona and G. M. Coclite, 2015] on the existence of a semigroup of global weak dissipative solutions of the corresponding closed-loop system defined for every initial data u_0\in H^1(\mathbb{R}). Any such solution decays esponentially to 0 as t\to\infty
Stability rates for patchy vector fields
No full textThis paper is concerned with the stability of the set of trajectories of a patchy vector field, in the presence of impulsive perturbations. Patchy vector fields are discontinuous, piecewise smooth vector fields that were introduced in Ancona and Bressan (1999) to study feedback stabilization problems. For patchy vector fields in the plane, with polygonal patches in generic position, we show that the distance between a perturbed trajectory and an unperturbed one is of the same order of magnitude as the impulsive forcing term
Introduzione bibliografica
No full textLo studio sulla letteratura critica che nell’ultimo cinquantennio si è occupata del pensiero di Marsilio da Padova conduce a interrogarsi, a partire dalle più recenti interpretazioni del Defensor pacis, su alcuni problemi giusfilosofici fondamentali che in quell’opera furono sollevati e sulle soluzioni che vi furono prospettate
On the asymptotic stabilization of a generalized hyperelastic-rod wave equation
No full textWe discuss the problem of asymptotic stabilization of the hyper-elastic-rod wave equation on the real line
egin{equation*}
partial_t u-partial_{txx}^3 u+3u partial_x u=
gammaleft(2partial_x u, partial_{xx}^2 u+u, partial_{xxx}^3 u
ight),quad t > 0,>>xin mathbb{R}.
end{equation*}
We consider the equation with
an additional forcing term of the form
%
for some lambda>0. We resume the results of cite{AC} on the existence of a semigroup of global weak dissipative solutions of
the corresponding closed-loop system
defined for every initial data . Any such solution
decays exponentially to 0 as
Schede grafiche di rilievo, rappresentazione ed elaborazione fotografica della Cittadella di Ancona
No full textQuesto lavoro s'inquadra in quel programma di ricerche che l'Istituto di Disegno e Composizione della Facoltà d'Ingegneria dell'Università di Ancona sta perseguendo da anni nel settore della conoscenza e della salvaguardia del nostro patrimonio artistico ed ambientale
Attainable profiles for conservation laws with flux function spatially discontinuous at a single point
No full textConsider a scalar conservation law with discontinuous flux (1):
\begin{equation*}
\quad u_{t}+f(x,u)_{x}=0,
\qquad f(x,u)= \begin{cases}
f_l(u)\ &\text{if}\ x<0,\\
f_r(u)\ & \text{if} \ x>0,
\end{cases}
\quad \quad \quad(1)
\end{equation*
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