Search results for "LOCI"
showing 7 items of 1277 documents
Log velocity profile and bottom displacement for a flow over a very flexible submerged canopy
2007
Management of shallow lagoons and salt marsh environments usually requires use of numerical models in order to understand the hydrodynamic characteristics of these basins. In order for these models to give reliable results one has to have good knowledge of the interaction between the flow and the aquatic vegetation, which strongly alters the hydrodynamic characteristics. Many experimental and theoretical studies are available in the technical literature, but, because of the very different vegetation and flow characteristics, they do not yet allow one to have a clear and general knowledge of the phenomena, in terms of both flow resistance and velocity distribution. The latter is very importa…
Numerical Simulations of the Flow Field of a Submerged Hydraulic Jump over Triangular Macroroughnesses
2021
The submerged hydraulic jump is a sudden change from the supercritical to subcritical flow, specified by strong turbulence, air entrainment and energy loss. Despite recent studies, hydraulic jump characteristics in smooth and rough beds, the turbulence, the mean velocity and the flow patterns in the cavity region of a submerged hydraulic jump in the rough beds, especially in the case of triangular macroroughnesses, are not completely understood. The objective of this paper was to numerically investigate via the FLOW-3D model the effects of triangular macroroughnesses on the characteristics of submerged jump, including the longitudinal profile of streamlines, flow patterns in the cavity regi…
EFFETTI LOCALI E D’AREA GENERATI DALLE MISURE DI MODERAZIONE DELLA VELOCITÀ. UN BILANCIO DA CONSIDERARE IN SEDE DI PIANIFICAZIONE
2008
Le strategie finalizzate al miglioramento della sicurezza stradale si muovono, in generale, secondo due finalità distinte: - da un lato, di contenere la gravità delle conseguenze di comportamenti di guida a rischio attraverso l’installazione di dispositivi utili per limitare i danni agli occupanti del veicolo in caso di urto; - d’altro lato, di impedire (o quanto meno scoraggiare) comportamenti di guida imprudenti attraverso l’adozione di misure idonee ad allertare gli utenti e ad indurli a comportamenti non trasgressivi. Alla seconda finalità sono riconducibili i dispositivi di moderazione della velocità, i quali, agendo sui comportamenti di guida, mirano a prevenire l’insorgere di inciden…
Fractional calculus approach for the representation of power spectral densities and correlation functions in wind engineering
2010
The paper deals with the digital simulation of wind velocity samples by Fractional Spectral Moment function. It is shown that such a function represents a third useful way to characterize a stationary Gaussian stochastic process, alongside the power spectral density and the correlation function. The method is applied to wind velocity fields whose power spectra is given by the Kaimal’s, the Davenport’s and the Solari’s representation. It is shown that by constructing a digital filter whose coefficients are the fractional spectral moments, it is possible to simulate samples of the target process as superposition of Riesz fractional derivatives of Gaussian white noise processes.
Univariate and multivariate properties of wind velocity time series
2009
We analyze the time series of hourly average wind speeds measured at 29 different stations located in Sicily, a region with a complex morphology. The investigation, performed from the univariate as well as the multivariate point of view, evidences that the statistical properties of wind at the single sites have features that are not reproduced by standard models and, thus, require specific modeling. Moreover, the synchronous evolution of wind velocity presents a cluster structure, obtained with different algorithms, that persists in the standard deviation too.
Contribution to thermal behaviour study of lithium-ion battery for electric and hybrid electric vehicle
2014
The main objectives of this study are to provide the essential information on the thermal behaviour of the battery cells for automotive purpose especially for EVs and HEVs through experimental work in order to develop an effective 3D electro-thermal model for lithium ion battery cells and pack. The experimental study is focusing on the distribution of temperature at various points of the battery cell surface, impact of different constant discharge rates, and also the importance of cooling system on the battery temperature behaviour. This thesis highlights the battery cell temperature under abuse discharge condition and the impact of stacking the battery cells inside the battery pack. Impact…
Mnemonikas paņēmienu pielietojums secīgajā tulkošanā
2017
Piezīmju veikšana ir tradicionāli pieņemts atmiņas atbalsts secīgajā tulkošanā; tomēr tai piemīt vairāki trūkumi. Tādēļ šī maģistra darba mērķis ir izpētīt mnemonikas paņēmienu pielietojuma iespējas secīgajā tulkošanā kā alternatīvu piezīmju veikšanai. Pētījuma dati tika iegūti, veicot regulārus tulkošanas testus un saņemot tulka atgriezenisko saiti. Rezultāti liecina, ka gan piezīmju veikšana, gan mnemonikas paņēmieni uzlabo informācijas atsaukšanu secīgajā tulkošanā; tomēr starp abiem atmiņas atbalsta veidiem tika konstatētas vairākas atšķirības. Tika secināts, ka mnemonikas paņēmienu pielietojumam secīgajā tulkošanā ir potence, jo tika iegūti labas kvalitātes tulkojumi. Tomēr vidēji piez…