Search results for "parametri"
showing 10 items of 1144 documents
Self-Consistent Charge Density-Functional Tight-Binding Parametrization for Pt–Ru Alloys
2017
We present a self-consistent charge density-functional tight-binding (SCC-DFTB) parametrization for PtRu alloys, which is developed by employing a training set of alloy cluster energies and forces obtained from Kohn-Sham density-functional theory (DFT) calculations. Extensive simulations of a testing set of PtRu alloy nanoclusters show that this SCC-DFTB scheme is capable of capturing cluster formation energies with high accuracy relative to DFT calculations. The new SCC-DFTB parametrization is employed within a genetic algorithm to search for global minima of PtRu clusters in the range of 13-81 atoms and the emergence of Ru-core/Pt-shell structures at intermediate alloy compositions, consi…
Mixed estimation technique in semi-parametric space-time point processes for earthquake description
2013
An estimation approach for the semi-parametric intensity function of a particular space-time point process is introduced. In particular we want to account for the estimation of parametric and nonparametric components simultaneously, applying a forward predictive likelihood to semi-parametric models. For each event, the probability of being a background event or one belonging to a seismic sequence is therefore estimated.
Enhanced chain dynamics in loop-sorting-systems by means of layout optimization and a kinematic model of the polygon action
2012
Published version of an article in the journal: Structural and Multidisciplinary Optimization. Also available from the publisher at: http://dx.doi.org/10.1007/s00158-011-0743-7 Poor dynamics owing to polygon action is a known concern in mechanical applications of closed articulated chains. In this paper a kinematic model of the polygon action in large chains of loop-sorting-systems is proposed. Through optimization techniques the chain dynamics is improved by minimizing the polygon action using a parametric model of the track layout as design variables. Three formulations of the kinematic polygon action are tested on an average sized planer tracks layout to find a superior model. Verificati…
Acoustic, neural, and perceptual correlates of polyphonic timbre
2012
Caratterizzazione e valorizzazione bio-agronomica di diverse accessioni di aglio in ambiente collinare siciliano
2008
L'aglio coltura "antica" e tipica di molte aree della Sicilia, ha svolto e continua a svolgere un ruolo fondamentale nella storia della tradizione culinaria. La specie viene, inoltre, utilizzata per usi terapeutici e presenta pregevoli caratteristiche nutrizionali. L'ampia disponibilità di popolazioni locali di aglio ha indotto, il Consorzio di ricerca Co.Ri.S.S.I.A. di Palermo ad avviare una ricerca finalizzata alla caratterizzazione e valorizzazione di accessioni di aglio di diversa provenienza. Dall'esperienza condotta è emerso che la specie ha presentato, in generale, una buona adattabilità all'ambiente di prova, riuscendo a fornire produzioni quanti-qualitative soddisfacenti.
A generalized methodology for distribution systems faults identification, location and characterization
2005
Service continuity is of basic importance in the definition of the quality of the electrical energy, for this reason, the research in the field of faults diagnostic for distribution systems is spreading ever more. In this paper, a new methodology for diagnostic management of automated distribution systems is presented. The technique is based on the solution of a circuital model of the electrical system resulting from the composition of distributed parameters quadripoles. The solution gives as a result the identification of the type of fault, of its characteristic parameters and location. The paper shows an application to line to line grounded and ungrounded faults in which also its precisio…
Fizisko un psihofizioloģisko parametru sakarības 11-16 gadus veciem skolēniem ar viegliem garīgās attīstības traucējumiem
2022
Skolēna fiziskā, psihiskā un intelektuālā attīstība ir savstarpēji saistītas. Lai labāk veicinātu skolēnu ar viegliem garīgās attīstības traucējumiem personības attīstību ir nepieciešams zināt sakarības starp organisma fiziskajiem un psihofizioloģiskajiem parametriem. Mērķis ir novērtēt 11-16 gadus vecu pusaudžu ar viegliem garīgās attīstības traucējumiem kustību un psihofizioloģiskās spējas, un izpētīt fizisko un psihofizioloģisko spēju kopsakarības. Mērķa sasniegšanai tika izvirzīti šādi uzdevumi: 1.veikt zinātniskās literatūras izpēti un analīzi atbilstoši diplomdarba tematam; 2. novērtēt skolēnu ar viegliem garīgās attīstības traucējumiem fiziskās spējas; 3.novērtēt skolēnu ar viegliem …
Parastās mellenes Vaccinium myrtillus (L.) rametu vecuma un izmēru struktūras salīdzinājums dažāda vecuma mētrāju audzēs Slīteres nacionālā parka ter…
2018
Mellene ir sīkkrūmu suga, kas ir viena no biežāk sastopamajām zemsedzes veģetācijas sugām boreālo mežu ekosistēmās, tomēr tā netiek pietiekami novērtēta. Mellene pozitīvi ietekmē bioloģisko daudzveidību, un tās klātbūtne ir viens no rādītājiem par mežu augšanas apstākļu bagātināšanos. Līdzīgi kā kokiem arī mellenes gadskārtas sniedz informāciju par apstākļiem konkrētajā teritorijā, taču par īsāku laika periodu. Par pētījuma vietu izvēlēts Slīteres nacionālais parks un tā apkārtne, jo tajā pārstāvēti dažāda vecuma mētrāji, kā arī tādēļ, ka noteiktā Slīteres nacionālā parka teritorijā iepriekš veidojies degums. Šajā teritorijā kopumā izveidots 21 parauglaukums (10 x 10m). Seši parauglaukumi i…
Global Estimation of Biophysical Variables from Google Earth Engine Platform
2018
This paper proposes a processing chain for the derivation of global Leaf Area Index (LAI), Fraction of Absorbed Photosynthetically Active Radiation (FAPAR), Fraction Vegetation Cover (FVC), and Canopy water content (CWC) maps from 15-years of MODIS data exploiting the capabilities of the Google Earth Engine (GEE) cloud platform. The retrieval chain is based on a hybrid method inverting the PROSAIL radiative transfer model (RTM) with Random forests (RF) regression. A major feature of this work is the implementation of a retrieval chain exploiting the GEE capabilities using global and climate data records (CDR) of both MODIS surface reflectance and LAI/FAPAR datasets allowing the global estim…
Topological canal foliations
2019
Regular canal surfaces of $\mathbb{R}^3$ or $\mathbb{S}^3$ admit foliations by circles: the characteristic circles of the envelope. In order to build a foliation of $\mathbb{S}^3$ with leaves being canal surfaces, one has to relax the condition “canal” a little (“weak canal condition”) in order to accept isolated umbilics. Here, we define a topological condition which generalizes this “weak canal” condition imposed on leaves, and classify the foliations of compact orientable 3-manifolds we can obtain this way.