8 Tesi di dottorato

8 Tesi di dottorato: [234] Home page macrotipologia

Sfoglia

8.1 Tesi di dottorato 234

Prodotti recenti

Divisibilità locale-globale in alcuni gruppi algebrici commutativi

In this thesis we study a local-global principle in algebraic groups that was first introduced by Dvornicich and Zannier in 2001, called the local-global divisibility problem. The problem is the following: given a commutative algebraic group G defined over a number field k and given q a positive integer, if a point P in G(k) is such that for all but finitely many places v of k there exists a q-divisor of P in G(k_v); can we conclude that there exists a q-divisor of P also in G(k)? In the firs...

Studio dei meccanismi biomoleculari della fibrosi cutanea utilizzando un modello sperimentale in vitro e valutazione dell'efficacia di un ceppo selezionato di probiotico nel contrastare il fenotipo fibrotico.

The protracted inflammatory phase in skin wound healing may lead to dermal fibrosis, and existing therapeutic methods have shown limited efficacy. Exploring alternative approaches, such as those involving specific probiotic strains, could offer potential therapeutic avenues. This study aims to assess the potential of Strephtococuss thermophilus lysate in counteracting the fibrogenic impact of TGF-β1 in normal human dermal fibroblasts (NHDF). NHDF underwent exposure to TGF-β1 to induce a fibro...

Minimal graphs in three-dimensional Killing submersions

We consider a connected and orientable Riemannian (resp. Lorentzian) three-manifold E admitting a never vanishing (resp. temporal) complete Killing vector field ξ ∈ X(E) whose associated one-parameter group of isometries G of E acts freely and properly on E. Then, there exists a Killing submersion π: E → M = E/G whose fibers are the integral curves of ξ. Killing submersions give rise to a natural notion of graph over a domain in M, that is, a smooth section of π over this domain. In this sett...

Ottimizzazione energetica di un impianto di refrigerazione a CO2 transcritica: analisi sperimentale e modellazione impiantistica

This thesis focuses on optimizing CO2 refrigeration systems in response to the Montreal Protocol's requirement to phase out ozone-depleting refrigerants and transition to safer and more environmentally friendly options. The research begins with an analysis of why carbon dioxide is an ideal refrigerant, followed by a review of the current state of research in this field. Experimental activities were then conducted at the University of L'Aquila, where each component of a commercial refrigeratio...

Trattamento e recupero di metalli preziosi e di base da rifiuti industriali attraverso processi idrometallurgici sostenibili e con approccio all'economia circolare

The recovery of material and energy from end-of-life products is increasingly fundamental for sustainable development. The most significant challenge for research in this sector is to find increasingly cutting-edge technologies that allow us to help the environment while generating profitable economic activities. Through the union of these two aspects, which until now may have seemed antithetical, we can talk about progress. From this standpoint, materials such as spent catalysts or elec...

Scopri

Accesso al fulltext

open219
no fulltext10
embargoed5