Search results for " sistemi"
showing 8 items of 1888 documents
Experimental campaign to assess numerical simulation of tool wear in orthogonal cutting
2007
The prolyl-isomerase PIN1 is essential for nuclear Lamin-B structure and function and protects heterochromatin under mechanical stress.
2021
Summary: Chromatin organization plays a crucial role in tissue homeostasis. Heterochromatin relaxation and consequent unscheduled mobilization of transposable elements (TEs) are emerging as key contributors of aging and aging-related pathologies, including Alzheimer’s disease (AD) and cancer. However, the mechanisms governing heterochromatin maintenance or its relaxation in pathological conditions remain poorly understood. Here we show that PIN1, the only phosphorylation-specific cis/trans prolyl isomerase, whose loss is associated with premature aging and AD, is essential to preserve heterochromatin. We demonstrate that this PIN1 function is conserved from Drosophila to humans and prevents…
Turismo relazionale in tre sistemi territoriali
2007
L'azione di ricerca ha lo scopo di verificare la presenza, nei tre contesti di studio (Val d’Anapo, Valle dell’Halaesa, S. Vito) di un’ offerta turistica che dispone di un sistema di relazioni formali ed informali al fine di ottenere un'idonea “mappatura” dei tre territori per determinare, con rigore scientifico, il fabbisogno turistico in chiave relazionale. Un secondo aspetto riguarda la verifica della dimensione relazionale con riferimento alla domanda turistica effettiva e potenziale delle località. Si vuol stabilire quali e quanti sono le relazioni presenti tra domanda turistica e sistema dell’offerta, sia attuali che potenziali ed in che termini questi contatti siano in grado di influ…
Urban Landscapes and Resilience. Exploring an adaptive design perspective
2017
Il concetto di resilienza in pianificazione è emerso in tempi recenti come un mezzo potente per sostenere la ricerca e l'innovazione sua nella teoria che nella pratica. Partendo da una definizione delle città come sistemi adattivi complessi, organismi viventi in un contesto di non-equilibrio e spazi di intensa interazione e interdipendenza uomo-natura, il contributo intende esplorare il ruolo dei servizi ecosistemici nella costruzione della resilienza urbana. Il cambiamento globale e l'incertezza richiedono un approccio strategico verso la resilienza urbana, attraverso l'adaptive design. Mentre una visione basata sullo stato di equilibrio tende a guardare alla forma urbana ideale, riconosce…
Damping Provision by Different Virtual Synchronous Machine Schemes
2020
The adoption of virtual synchronous machine (VSM) schemes for the control of power converters is gaining more and more attention both in academia and industry. The VSM control strategies fall into the category of grid-forming converter controls, and they are intended for a range of different applications, providing specific services and different kinds of support to the grid. The paper investigates the possibility of damping provision to the system by VSM power converters. Different schemes are considered and compared, showing the opportunity of the investigated solutions through combined modal and time domain analyses. A specific modification of the power synchronization loop is recognized…
Sensitivity Analysis and Frequency Dynamics of Grid-Connected Converters with Virtual Inertia
2021
For the participation in the frequency control of the system, power converters can be controlled with different strategies and methods, sharing the common concept of virtual inertia capability. In this work, a sensitivity analysis of two main categories of converter controls with virtual inertia is presented. The considered schemes are a grid-following current vector control with additional virtual inertia block and a grid-forming control scheme based on virtual synchronous machine concept. A proper basis for the comparison is first assessed providing an analytical correlation between the control parameters of the two schemes. For the two control strategies, the sensitivity analysis of the …