87,490 research outputs found
Il regime della nullità del provvedimento amministrativo e le relative azioni
No full textIl contributo si occupa di analizzare il regime dell'azione di nullità del provvedimento amministrativo alla luce delle riflessioni di Antonio Romano Tassone sulla nullità del provvediment
Spunti di riflessione su alcune questioni "vecchie" e "nuove" in tema di partecipazione al procedimento amministrativo
No full textLa (nuova) responsabilità del provider
No full textIl capitolo affronta l'annoso problema della responsabilità dell'internet service provider, coniugando il dato normativo contenuto nella direttiva e-commerce del 2000 con la giurisprudenza sia nazionale che comunitaria prodottasi negli ultimi venti anni sul tema. Esso comprende inoltre alcune prime riflessioni sul Service Digital Act recentemente varato dal legislatore comunitario.The chapter deals with the age-old problem of Internet service provider liability, combining the legal data contained in the e-commerce directive of 2000 with both national and Community case law produced over the last twenty years on the subject. It also includes some initial reflections on the Service Digital Act recently passed by the Community legislator
Percorso sostenibile dalle emissioni industriali alle foreste per la compensazione della CO2.
No full text
ACCELERATION SCHEMES FOR AB-INITIO MOLECULAR-DYNAMICS SIMULATIONS AND ELECTRONIC-STRUCTURE CALCULATIONS
No full textWe study the convergence and the stability of fictitious dynamical methods for electrons. First, we show that a particular damped second-order dynamics has a much faster rate of convergence to the ground state than first-order steepest-descent algorithms while retaining their numerical cost per time step. Our damped dynamics has efficiency comparable to that of conjugate gradient methods in typical electronic minimization problems. Then, we analyze the factors that limit the size of the integration time step in approaches based on plane-wave expansions. The maximum allowed time step is dictated by the highest frequency components of the fictitious electronic dynamics. These can result either from the large wave vector components of the kinetic energy or from the small wave vector components of the Coulomb potential giving rise to the so called charge sloshing problem. We show how to eliminate large wave vector instabilities by adopting a preconditioning scheme in the context of Car-Parrinello ab initio molecular-dynamics simulations of the ionic motion. We also show how to solve the charge sloshing problem when this is present. We substantiate our theoretical analysis with numerical tests on a number of different silicon and carbon systems having both insulating and metallic character
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