Search results for "Godi"

Contractivity results in ordered spaces. Applications to relative operator bounds and projections with norm one

2016

This paper provides various “contractivity” results for linear operators of the form I−C where C are positive contractions on real ordered Banach spaces X. If A generates a positive contraction semigroup in Lebesgue spaces Lp(μ), we show (M. Pierre's result) that A(λ−A)−1 is a “contraction on the positive cone”, i.e. A(λ−A)−1x≤x for all x∈L+p(μ)(λ>0), provided that p⩾2.  We show also that this result is not true for 1 ⩽ p<2. We give an extension of M. Pierre's result to general ordered Banach spaces X under a suitable uniform monotony assumption on the duality map on the positive cone X+. We deduce from this result that, in such spaces, I−C is a contraction on X+ for any positive projection…

QUANTITATIVE CONVERGENCE RATES FOR SUBGEOMETRIC MARKOV CHAINS

2015

We provide explicit expressions for the constants involved in the characterisation of ergodicity of subgeometric Markov chains. The constants are determined in terms of those appearing in the assumed drift and one-step minorisation conditions. The results are fundamental for the study of some algorithms where uniform bounds for these constants are needed for a family of Markov kernels. Our results accommodate also some classes of inhomogeneous chains.

Uniformly ergodic A-contractions on Hilbert spaces

2009

Structure of distributions generated by the scenery flow

2015

We expand the ergodic theory developed by Furstenberg and Hochman on dynamical systems that are obtained from magnifications of measures. We prove that any fractal distribution in the sense of Hochman is generated by a uniformly scaling measure, which provides a converse to a regularity theorem on the structure of distributions generated by the scenery flow. We further show that the collection of fractal distributions is closed under the weak topology and, moreover, is a Poulsen simplex, that is, extremal points are dense. We apply these to show that a Baire generic measure is as far as possible from being uniformly scaling: at almost all points, it has all fractal distributions as tangent …

A generalized method for the design of ergodic sum-of-cisoids simulators for multiple uncorrelated rayleigh fading channels

2010

In this paper, we present a new method for the design of ergodic sum-of-sinusoids (SOS) simulation models for multiple uncorrelated Rayleigh fading channels. The method, which is intended for a special class of SOS models, known as sum-of-cisoids (SOC) models, can be used to generate an arbitrary number of uncorrelated Rayleigh fading waveforms with specified Doppler power spectral characteristics. This is in contrast to the SOS simulators currently available in the open literature that have been designed under the isotropic scattering assumption, which are limited to the simulation of uncorrelated channels characterized by Clarke's U-shaped Doppler power spectral density (DPSD). The excell…

Gibbs and harmonic measures for foliations with negatively curved leaves

2013

In this thesis we develop a notion of Gibbs measure for the geodesic flow tangent to a foliated bundle over a compact and negatively curved basis. We also develop a notion of F-harmonic measure and prove that there exists a natural bijective correspondence between the two. For projective foliated bundles with sphere-fibers without transverse invariant measure, we show the uniqueness of these measures for any Hölder potential on the basis. In that case we also prove that F-harmonic measures are realized as weighted limits of large balls tangent to the leaves and that their conditional measures on the fibers are limits of weighted averages on the orbits of the holonomy group.

FOUNDATIONS OF FRACTIONAL DYNAMICS

1995

Time flow in dynamical systems is reconsidered in the ultralong time limit. The ultralong time limit is a limit in which a discretized time flow is iterated infinitely often and the discretization time step is infinite. The new limit is used to study induced flows in ergodic theory, in particular for subsets of measure zero. Induced flows on subsets of measure zero require an infinite renormalization of time in the ultralong time limit. It is found that induced flows are given generically by stable convolution semigroups and not by the conventional translation groups. This could give new insight into the origin of macroscopic irreversibility. Moreover, the induced semigroups are generated …

Godu telpas Latvijas viensētās

2017

Novērtēt atstāto un bieži vien degradējušos viensētu mantojumu un rast iespēju atdzimt jaunai funkcijai ir mūsdienu aktualitāte. Tā saglabājot vēstures liecības un panākot to attīstību. Godu telpas izveide vēsturiskā Latvijas viensētas saimniecības ēkā ir radošs veids kā atklāt un papildināt šo ēku unikalitāti un šarmu. Šī bakalaura darba galvenais mērķis ir godu telpas interjera dizaina projekta izveide Latvijas viensētā. Darba uzdevumi ir veikt teorētiskās literatūras un saistošo dokumentu analīzi par latviešu īpašumu un dzīvesvietu, Latvijas viensētām, godu tradīcijām senatnē un mūsdienās. Veikt salīdzinošo pētījumu par Latvijas viensētu godu telpu interjera izveides principu īstenošanu.…

La nuova disciplina del contratto di godimento in funzione della successiva alienazione immobiliare

2014

L'art. 23 del d.l. 12-9-2014, n. 133, c.d. «Sblocca Italia», introduce la figura del rent to buy, con cui mediante un contratto di godimento si realizza un programma preparatorio a una successiva alienazione immobiliare. L'esame degli aspetti disciplinati - prima dell'entrata in vigore della legge di conversione - rivela a contrario l'ampio spazio riservato all'autonomia privata, che nonostante qualche criticità conferma l'appetibilità del nuovo modello contrattuale.

Almost sure rates of mixing for i.i.d. unimodal maps

2002

International audience; It has been known since the pioneering work of Jakobson and subsequent work by Benedicks and Carleson and others that a positive measure set of quadratic maps admit an absolutely continuous invariant measure. Young and Keller-Nowicki proved exponential decay of its correlation functions. Benedicks and Young, and Baladi and Viana studied stability of the density and exponential rate of decay of the Markov chain associated to i.i.d. small perturbations. The almost sure statistical properties of the sample stationary measures of i.i.d. itineraries are more difficult to estimate than the "averaged statistics". Adapting to random systems, on the one hand partitions associ…