419 research outputs found
Numerical modelling for wind farm operational assessment in complex terrain
No full textWind farm operation in very complex terrains generally involves complicated and severe environment for wind turbines. Strong speedups, extreme wind veer and high turbulence create a harsh environment for turbine safety and durability. A detailed analysis of the wind field can be very useful in order to isolate the most dangerous conditions and prevent exceptional loads. In this study it is investigated to what extent numerical free flow model can give reliable information on the operational behaviour of wind farms. For this reason, two wind farms, having very different features, are selected: the former is sited on a very gentle terrain and its dynamics is mainly driven by wake interactions, while the latter is instead sited on a very complex terrain. The wind field induced by the orography is calculated with two different numerical approaches, CFD (Computational Fluid Dynamics) and mass consistent modelling. Numerical results are compared and validated against experimental measurements from anemometer met-masts and from turbines SCADA (Supervisory Control And Data Acquisition) data sets. The analysis demonstrates that wind field models can give very useful information on rotor alignment patterns and on their influence on the overall park performance
L’ingegneria dei tessuti: utilizzo in chirurgia plastica. Revisione della casistica dopo 10 anni di applicazione
No full textWind Energy Forecast in Complex Sites with a Hybrid Neural Network and CFD based Method
No full textAbstractThe wind is an intermittent renewable energy source and the energy production forecast is a fundamental activity for many reasons (grid regulation, maintenance, etc.).In this work a hybrid method (based on weather forecast data, neural networks and computational fluid dynamics) and a pure neural network approach are compared in a complex terrain site.The post processing of real production data has been discovered to be a key activity. Treatment and filtering of data spreading out from the supervisory control and data acquisition system are fundamental both for training and testing methods reliability
Tudor Translation in Theory and Practice
No full textFilling a gap in the study of early modern literature, Massimiliano Morini here exhaustively examines the aims, strategies, practice and theoretical ideas of the sixteenth-century translator. Morini analyzes early modern English translations of works by French and Italian essayists and poets, including Montaigne, Castiglione, Ariosto and Tasso, and of works by classical writers such as Virgil and Petrarch. In the process, he demonstrates how connected translation is with other cultural and literary issues: women as writers, literary relations between Italy and England, the nature of the author, and changes in the English language. Since English Tudor writers, unlike their Italian contemporaries, did not write theoretical treatises, the author works empirically to extrapolate the theory that informs the practice of Tudor translation - he deduces several cogent theoretical principles from the metaphors and figures of speech used by translators to describe translation. Employing a good blend of theory and practice, the author presents the Tudor period as a crucial transitional moment in the history of translation, from the medieval tradition (which in secular literature often entailed radical departure from the original) to the more subtle modern tradition (which prizes the invisibility of the translator and fluency of the translated text). Morini points out that this is also a period during which ideas about language and about the position of England on the political and cultural map of Europe undergo dramatic change, and he convincingly argues that the practice of translation changes as new humanistic methods are adapted to the needs of a country that is expanding its empire
Wind Power Forecasting techniques in complex terrain: ANN vs. ANN-CFD hybrid approach
No full textDue to technology developments, renewable energies are becoming competitive against fossil sources and the number of wind farms is growing, which have to be integrated into power grids. Therefore, accurate power forecast is needed and often operators are charged with penalties in case of imbalance. Yet, wind is a stochastic and very local phenomenon, and therefore hard to predict. It has a high variability in space and time and wind power forecast is challenging. Statistical methods, as Artificial Neural Networks (ANN), are often employed for power forecasting, but they have some shortcomings: they require data sets over several years and are not able to capture tails of wind power distributions. In this work a pure ANN power forecast is compared against a hybrid method, based on the combination of ANN and a physical method using computational fluid dynamics (CFD). The validation case is a wind farm sited in southern Italy in a very complex terrain, with a wide spread turbine layout
From digital design to physical model. Origami techniques applied to dynamic paneling shapes for acoustic performance control
No full textThe recent trend toward non-standard and free form architecture has generated a lot of debate among the Scientific Community. The reasons can be found in the renewed interest in organic shapes, in addition to recent and powerful capabilities of parametric platforms. In this regard, the Visual Programming Language (VPL) interface gives a high level of freedom and control for conceiving complex shapes. The geometric problems in identifying a suitable shape have been addressed by relying on the study of Origami. The control of variable geometry has required the use of algorithmic models that ensure fast changes and free control of the model, besides a physical one made of rigid cardboard to simulate its rigid-foldability. The aim is to present a prototype of an adaptive structure, with an acoustic application, to control sound quality and perception in spaces where this has a central role, such as theatres or concert halls
Acta Vulnologica 2004 Giugno;2(1-2):17-25 La gestione delle cicatrici. Trattamento tradizionale e ingegneria dei tessuti a confronto
No full textNoise perception and cognitive effort in the simulated reverberant and quiet environment of the New Central Civic Library of Torino
No full textIn recent years, libraries have evolved from spaces dedicated exclusively to individual study into multifunctional environments, which integrate social and cultural activities. However, nowadays libraries can be experienced in two different ways, i.e., either as a traditional quiet space dedicated to individual study, or as a multifunctional environment that accommodates a wider range of noisy activities. Consequently, noise perception and its impact on users’ annoyance and cognitive performance have become important research topics. This study investigates these aspects within the simulated quiet sound environment of the New Civic Central Library of Torino (Italy). With a volume of approximately 160000 m3 and a reverberation time of about 5 s at mid frequencies, it is designed to accommodate various functions, but in this study, the primary activity of the individual study was examined. A geometrical acoustic simulation was run using Odeon 18. Four receivers were defined, exposed to various noise sources: traffic, ventilation, ambient buzz, footsteps, page-turning, pen taps, and intelligible speech. Mixed noise levels at the receivers ranged from 43 to 47 dB(A), reproducing realistic conditions of similar library environments. Listening tests were performed with 24 normal-hearing participants aged 20–55 using static headphones. Participants completed tasks reflecting typical library activities. No significant differences were revealed in most cognitive outcomes between noise and silence conditions. The only exception was a semantic processing task, such as reading aloud, which showed slight deterioration under noise exposure. These findings emphasize the importance of appropriate acoustic design even in quiet libraries to safeguard cognitive performance
The Faunæ Ligusticæ Fragmenta of Massimiliano Spinola (1805).
No full textDie Faunæ Ligusticæ Fragmenta, Decas Prima, 1805, waren der erste und einzige gedruckte Teil eines geplanten Werkes über die Insekten Liguriens. Er wurde auf Kosten seines Autors Massimiliano Spinola gedruckt. Soweit bekannt ist, blieb nur eine Kopie erhalten, da sein Autor kurzerhand und mit beinahe vollem Erfolg versuchte, ihn zu unterdrücken. Ob die Faunæ damit als valid publiziert gelten müssen oder nicht, wird diskutiert. Hier wird begründet, daß die Faunæ im strengen Sinne der Internationalen Regeln für die Zoologische Nomenklatur nicht gültig veröffentlicht worden sind und daß die wenigen Taxa, alle Hymenoptera, die darin beschrieben sind, mit den Namen bezeichnet werden sollten, einige etwas verändert, unter denen sie in den Insectorum Liguriæ, Bd. I, 1806, des gleichen Autors erstmals gültig publiziert wurden.StichwörterBibliography, Italy, Insecta, Hymenoptera.The Faunæ Ligusticæ Fragmenta, Decas Prima, 1805, was the first and only part to be printed of a projected work on the insects of Liguria. It was printed at the expense of its author, Massimiliano Spinola, and, so far as is known, only one copy survives, this primarily for the reason that its author shortly, and almost entirely successfully, sought to suppress it. Whether the Faunæ was or was not validly published has been disputed. It is argued here that the Faunæ was not validly published within a strict reading of the International Code of Zoological Nomenclature, and that the few taxa, all Hymenoptera, described in it should be known by the names, some altered, under which they were first validly published in the same author\u27s Insectorum Liguriæ, volume I, 1806.KeywordsBibliography, Italy, Insecta, Hymenoptera
La damnatio memoriae di Domiziano. Iscrizioni e monumenti di Roma
No full textRiflessione sugli effetti del provvedimento senatorio comminante la damnatio memoriae per Domiziano a giudicare dalle iscrizioni e dai monumenti di Roma riferibili all'ultimo principe della dinastia Flavi
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