176,697 research outputs found
Recensione di Giuseppe Episcopo e Sara Sullam (a cura di), Ascolto (Biblion, 2022)
No full textRecensione di Giuseppe Episcono e Sara Sullam (a cura di), Ascolto (Biblion, 2022)
A numerical analysis on the drainage capacity of a ropax vessel in the garage deck, in still water and in waves
No full textIncidence of wind spectrum and turbulence intensity on the design of mooring systems for floating offshore wind turbines
No full textThe paper focuses on the incidence of wind spectrum and turbulence intensity on the design of stationkeeping systems for Floating Offshore Wind Turbines. After a brief review about the employed nonlinear time-domain hydrodynamic model, some basics about the Ultimate and Fatigue Limit State design conditions of the mooring system are provided. Subsequently, the two wind spectra, employed in the numerical simulations, are briefly introduced. The former is the NPD wind spectrum, generally applied for the design of mooring systems for typical offshore structures, employed in the oil and gas sector. The latter is the Kaimal wind spectrum, generally employed for the design of offshore wind turbines in conjunction with different turbulence models, depending on the operative scenario. The numerical investigation is performed considering the DeepCwind platform, equipped with the 5 MW NREL wind turbine, as reference support structure, deployed in the North Sea area. Three different water depths, from 200 up to 400 m, are considered. It is verified that both the wind spectrum and turbulence model play a fundamental role not only for the optimum design of the stationkeeping system, but also for the proper selection of the line scope, as well as of the leading usage factors
Mooring design and selection for floating offshore wind turbines on intermediate and deep water depths
No full textThe paper focuses on design and selection of mooring systems for Floating Offshore Wind Turbines (FOWTs) for intermediate and deep water depths, based on ultimate, accidental and fatigue limit state design conditions, with reference to power production, parked wind turbine and mooring line fault conditions. Platform static and dynamic offsets are determined by a purposely developed 6DOF programme in the frequency domain, accounting for first and second order motions. The Dutch tri-floater platform, together with the well-known 5 MW NREL wind turbine, is assumed as reference design. Besides, two sites, the one in the Southern North Sea, near Dogger Bank on water depths ranging from 50 up to 80 m, the other one in the Northern North Sea, near the Troll field area on water depths ranging from 200 up to 350 m, are assumed as candidate deployment areas, to investigate the effect of: (i) line number, (ii) platform admissible offset and line scope, (iii) offshore/onshore planned maintenance inspections and (iv) mooring technology on relevant installation and maintenance costs. A preliminary cost analysis is also performed and some recommendations are given to correctly choice the most suitable mooring configuration, as a function of water depth
Motion Induced Interruptions Frequency Seakeeping Criterion: the Case of Small Fishing Vessels
No full textSzczecin, Polan
Motion Induced Interruptions Frequency Seakeeping Criterion: the Case of Small Fishing Vessels
No full textSzczecin, Polan
Verdad y mentira en la política en la época de las redes : nuevas emergencias democraticas.
No full textThe word post-truth can be referred to those circumstances in which emotions or personal opinions are stronger than objective facts in processes of making public opinion. This paper proposes a jus-philosophical discussion about the use of post-truth in politics, by analyzing its historical-conceptual genesis with the birth of post-modernism and through the technological global revolution, begun in the Eighties. The work also discusses post-truth by examining Hannah Arendt’s thesis who analyzed the category both analyzing the Pentagon Papers scandal and the Nazi-totalitarian movements.La palabra post-verdad indica condiciones en las que la influencia de los hechos objetivos en la formación de la opinión pública era menor que la de las emociones o las creencias personales. Este trabajo tiene el objetivo de proponer una reflexion iusfilosófica sobre la post-verdad en la política a partir de su génesis histórico-conceptual, que corresponde a la edad del posmodernismo, y que continúa la revolución tecnológica global que comenzó en los años ochenta del siglo pasado y definió su dominio Sociopolítico. Este trabajo, también analiza las tesis de Hannah Arendt, acerca de los totalitarismos y los escándalos americanos de los Pentagon Papers
Dal Monte Nuovo a Cuma: un itinerario nei Campi Flegrei tra vulcanologia ed archeologia.
No full text
Silicone resins filled with alumina nanoparticles for impregnation of electrical motors title
No full textIn the present paper, a new impregnation system for rotor and stator windings of medium and
high power traction motors are obtained using silicone thermosetting resins and alumina
nanoparticles. Silicone nanocomposites are prepared by combined dispersion techniques,
namely mechanical mixing and sonication. Results about thermal, mechanical and electrical
properties of silicone-alumina nanocomposites are shown and compared with those of
unfilled matrix, used as a reference. The influence of different fillers content (1-7% in weight)
on nanocomposites properties is fully discusse
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