Search results for "SISTEMI"
showing 10 items of 2026 documents
An Analysis of the Intertial Response of Small Isolated Power Systems in Presence of Generation from Renewable Energy Sources
2018
Renewable Energy Sources are posing critical issues related to the mining of power systems stability, essentially due to a decrement of the inertial response during system's contingencies. As a consequence, to preserve the security and the reliability of the system, it is necessary to adopt new frequency adjustments mechanisms. This issue becomes particularly critical in isolated power systems, like those of small islands not supplied by the main grid, in the case of high shares of production from unpredictable renewabies such as photovoitaic and wind sources. In this framework, the present work deals with the analysis of the variation of the inertia time constant of a small island in vario…
Pseudo-haptic Controls for Mid-air Finger-based Menu Interaction
2019
Virtual Reality (VR) is more accessible than ever these days. While topics like performance, motion sickness and presence are well investigated, basic topics as VR User Interfaces (UIs) for menu control are lagging far behind. A major issue is the absence of haptic feedback and naturalness, especially when considering mid-air finger-based interaction in VR, when "grabbable" controllers are not available. In this work, we present and compare the following two visual approaches to mid-air finger-based menu control in VR environments: a planar UI similar to common 2D desktop UIs, and a pseudo-haptic UI based on physical metaphors. The results show that the pseudo-haptic UI performs better in t…
Crowdboard: Augmenting in-person idea generation with real-time crowds
2017
Online crowds can help infuse creativity into the design process, but traditional strategies for leveraging them, such as large-scale ideation platforms, require time and organizational effort in order to obtain results. We propose a new method for crowd-based ideation that simplifies the process by having smaller crowds join in-person ideators during synchronous creative sessions. Our system Crowdboard allows online crowds to provide real-time creative input during early-stage design activities, such as brainstorming or concept mapping. The system enables in-person ideators to develop ideas on a physical or digital whiteboard which is augmented with real-time creative input from online par…
Dall’Ingegneria Agraria all’Ingegneria dei Biosistemi: didattica e ricerca in Europa e negli USA
2009
Il tradizionale settore dell’Ingegneria Agraria da alcuni anni si sta evolvendo, a livello internazionale, verso quello più ampio dell’Ingegneria dei Biosistemi. L’Ingegneria Agraria applica l’ingegneria alle scienze agrarie, mentre l’Ingegneria dei Biosistemi estende le applicazioni dell’ingegneria alle scienze biologiche ed ambientali, per uno sviluppo sostenibile dell’agricoltura, del settore alimentare, dell’uso del suolo e dell’ambiente, includendo pertanto tematiche innovative quali i bio-materiali, le energie rinnovabili, la gestione dei reflui, la tracciabilità, la qualità e la sicurezza degli alimenti, ecc. Come conseguenza della suddetta evoluzione sono stati istituiti: - a livell…
INNOVAZIONE TECNOLOGICA DI SISTEMI, COMPONENTI E MATERIALI
2016
Il fabbisogno energetico di un edificio è la somma dell’energia necessaria per il riscaldamento, il raffrescamento, la ventilazione e l’illuminazione. La somma di tali consumi incide fortemente sul bilancio energetico nazionale e, alla riduzione di tale incidenza, sono dedicate numerose ricerche. Alcune di queste sono tese all’individuazione di nuove fonti energetiche rinnovabili, altre alla riduzione dei consumi attraverso l’efficientamento dell’involucro degli edifici e al miglioramento degli impianti. Tutte queste ricerche sono tese all’efficientamento del consumo energetico in fase d’uso degli edifici, l’energia che si va a misurare è dunque detta Operating energy. La progettazione di u…
Sistemi di trasporto ed inquinamento atmosferico: linee-guida per un modello di analisi delle emissioni
1995
New Materials Design Through Friction Stir Processing Techniques
2007
Friction Stir Welding (FSW) has reached a large interest in the scientific community and in the last years also in the industrial environment, due to the advantages of such solid state welding process with respect 1(o) the classic ones. The complex material flow occurring during the process plays a fundamental role in such solid state welding process, since it determines dramatic changes in the material microstructure of the so called weld nugget, which affects the effectiveness of the joints. What is more, Friction Stir Processing (FSP) is mainly being considered for producing high-strain-rate-superplastic (HSRS) microstructure in commercial aluminum alloys. The aim of the present research…
Alterazioni degli effetti broncodilatatori della inspirazione profonda in pazienti con Sclerosi Sistemica
2006
Interconnections criteria of grounding grids in global grounding systems
2018
A Global Grounding System is defined as the combination of local grounding systems, obtained by their interconnection, which ensures, thanks to their proximity, that no dangerous touch voltages can arise. The interconnection of grounding systems via the armors of the MV cables, between secondary substations and HV/MV stations is herein analyzed to verify the effects on touch voltages in ground-fault conditions. In particular, two main issues are discussed: 1) the transfer of dangerous voltages to secondary substations, due to ground-faults occurring at the HV/MV station; 2) the reduction in the magnitude of the ground potential rise due to ground-fault conditions at secondary substations, t…
Integration Issues of Distributed Generators Considering Faults in Electrical Distribution Networks
2014
In the recent years there is a great interest in integration of distributed generation (DG) units at distribution level; this integration leads to planning as well as operational challenges. Some possibilities to handle grid planning issues are addressed in this paper. Effects on grid protection, fault current level, and voltage profile are investigated and described for different types of DG units; the classification of DG units is based on their terminal characteristics in terms of real and reactive power delivering capability. Different scenarios for mis-coordination problems caused by DG interconnection are discussed. The effect of the DG on the voltage profile of a distribution network…