Search results for "ingegneria"
showing 10 items of 1227 documents
NUMERICAL FATIGUE LIFE EVALUATION OF AN INNOVATIVE INTERNAL COMBUSTION ENGINE SHAFT
2011
A novel self-balanced internal combustion engine is presented. The new engine has a modular structure composed of two cylinders arranged in opposite way. It is characterized by an innovative system of linking between the pistons and the shaft, which has three toggles. One of these is on the middle of the shaft, whereas the others two are placed symmetrically. Thanks to this particular shape of the shaft, the pistons can rotate with the same timing and so the new engine comes back to be perfectly auto-balanced. Moreover, the fatigue life prediction of the shaft has been studied through numerical methods. In particular, two different approaches have been compared to estimate the maximum numbe…
Prospettive dell'ingegneria stradale
2008
Notiziario della Società Italiana di Infrastrutture Viarie dedicato all'incontro scientifico-culturale con una forte connotazione internazionale intitolato: “Road Engineering Research: New Perspectives for the next generation of researchers”, svolto ad Ancona nel Luglio del 2008.
Biomechanical analysis of Ascending Thoracic Aortic Aneurysm (ATAA)
2021
According to the reports of the World Health Organisation (WHO), cardiovascular diseases are the number one cause of death worldwide. Specifically, arterial disease and degeneration are the major reasons for cardiovascular death and disability. Because these diseases are dependent on the changes of the mechanical properties of the arterial wall, it is very important to know as much as possible about the structural composition of arteries. The human aorta is the biggest artery in the body and consists of three main parts, ascending aorta, aortic arch and descending aorta. The walls of the arteries consist of three layers, the intima, media and adventitia, where each of the layers has differe…
Disoleatori statici per il trattamento delle acque di piccole e medie utenze
2012
Per rimuovere gli olii dalle acque reflue di piccole e medie utenze si utilizzano molto i disoleatori prefabbricati. Le verifiche di tre disoleatori commerciali di tipo statico hanno suggerito il limite inferiore per il tempo di detenzione idraulica, e quello superiore per il carico superficiale. Le vasche bi-stadio non hanno dimostrato vantaggi sulle mono-stadio.
Impianto perfezionato per il trattamento di acque reflue
2019
Negli ultimi anni, a causa dell’incremento dei costi di smaltimento dei fanghi prodotti nel corso dei processi depurativi basati su metodi biologici, si va diffondendo sempre più la tendenza e la necessità di ridurne la produzione direttamente alla fonte, ovvero nel corso dello stesso processo che li genera. Diversi metodi sono proposti in letteratura e molti di essi sono già coperti da brevetto (OSA®, Cannibal®, Biminnex®), applicati ai processi biologici a fanghi attivi convenzionali (CAS). Il limite di questi processi è che una riduzione molto spinta della produzione di fango di supero, ottenuta sottoponendo la biomassa a stress biologico, comporta significativi peggioramenti della quali…
R&D ALLIANCE TIMING IN THE BIOPHARMACEUTICAL INDUSTRY: A REAL OPTIONS GAME APPROACH.
Greenhouse gas emissions from membrane bioreactors
2018
Nowadays, it is widely accepted that wastewater treatment plants (WWTPs) are significant sources of greenhouse gas (GHG) emission, significantly contributing to anthropogenic sources of GHG emission. Among the GHG emitted from WWTPs, nitrous oxide (N2O) has been identified as the potentially major component, since its high global warming potential (GWP) is 298 times higher than that of Carbon dioxide (CO2) and also to its capability to react with stratospheric ozone, causing the ozone layer depletion. Up to now, most of the experimental investigations aimed at assessing the key mechanisms of N2O formation, as well as the operational conditions that can enhance its emission, have been carrie…
How strategic needs influence alliance formation and their governance modes: An empirical study in the Italian biopharmaceutical industry
2011
Firms enter strategic alliances for various reasons, and the motives behind formation of these alliances are one of main research subjects in the management field. The large literature on the issue has highlighted how alliances answer to a strategic need for collaboration that is the need to improve competitive strength through collaboration agreements. However, the study here addresses the strategic need perspective to alliances under a more specific point of view. We question what kind of competitive strengths firms aim at acquiring through inter-firm relationships. By reviewing of the most relevant literature on the issue we assume that alliances respond to three principal strategic need…
A new approach for assessing minimum flow in ephemeral streams
2009
The aim of this paper is to propose a new methodological approach, appropriate for low-yielding catchments, by calculating the ecological minimum river flow starting from the river water quality based on biological indicators and physical–chemical characteristics as reported in the Italian Water Law no. 152/06 and in the UE 2000/60 Directive (WFD: Water Framework Directive). Actually, protecting and restoring river flow regimes and hence the ecosystems they support by providing environmental flows, has become a major aspect of river basin management. In detail, pollutant concentrations downstream and fluvial structure cross-sections have been evaluated, starting from discharges released dow…
Effect of long-term salinity increase on nitritation and denitritation kinetics in activated sludge and granular sludge reactors
2017
The aim of this work was to investigate the effects of moderate and drastic long-termincrease of salinity.Particularly, the study was aimed at assessing the shock effecton nitritationand denitritation kineticsof halophilic biomass inboth forms:flocculent activated sludge and granular sludge.