1,720,997 research outputs found
CAPECON (Civil UAV Applications & Economic Effectivity of Potential Configurations Solutions) finanziato dall'Unione Europea nell'ambito del 5° Programma Quadro. Inizio: 1° Maggio 2002; Fine: 30 Aprile 2005
No full textNell’ambito del Programma di Ricerca finanziato dall’Unione Europea e denominato CAPECON (Civil UAV Applications & Economic Effectivity of Potential Configurations Solutions) il Dott. Gennaro Scarselli, con la supervisione del Prof. Leonardo Lecce, ed in collaborazione con i Gruppi di Costruzioni Aeronautiche, guidato dal Prof. Accardo, e Meccanica del Volo, guidato dal Prof. Coiro, ha coordinato le attività tecniche finalizzate alla progettazione completa di un MALE (Medium Altitude Long Endurance) UAV e consistenti: nella preliminare progettazione aerodinamica del velivolo in accordo al profilo di missione specificato ed ai requisiti imposti; nella conseguente progettazione strutturale del velivolo; nell’analisi di Affidabilità e Sicurezza eseguita a partire dai dati tecnici riguardanti i singoli sottosistemi. In particolare il Dott. Gennaro Scarselli ha seguito la progettazione strutturale che è stata svolta con il seguente approccio: sono state individuate due possibili soluzioni, una in composito e l’altra in alluminio, che sono state calcolate agli elementi finiti in modo da garantire una fissata resistenza ai carichi esterni. Queste due soluzioni sono state confrontate al fine di individuare la migliore in termini di peso e, quindi, di prestazioni. Dal confronto è emersa una maggiore efficienza dell’impiego di materiali compositi dal punto di vista prestazionale. Nell’ambito dello stesso Programma di Ricerca, CAPECON, il DPA della "Federico II" di Napoli aveva il compito di analizzare dal punto di vista strutturale le prestazioni di un HALE (High Altitude Long Endurance) UAV, denominato OBW, il cui concetto è stato sviluppato dal Centro di Ricerca francese Onera: a tale scopo il Dott. Gennaro Scarselli, in collaborazione con il gruppo di Costruzioni Aeronautiche del Prof. Accardo, ha eseguito l’analisi statica e dinamica (analisi di modi propri e frequenze naturali) della semiala di un blended wing body, tipologia di velivolo consistente in unico corpo ala – fusoliera mosso da due Pratt&Whitney 535. Inoltre il DPA ha eseguito l’analisi di Affidabilità e Sicurezza valutando i parametri MTBCF (Mean Time Before Critical Failure), MTBL (Mean Time Before Loss), MTBUCL (Mean Time Before UnControlled Landing) relativi al velivolo OBW. L’analisi eseguita in base ai principi della Teoria dell’Affidabilità, utilizzando la schematizzazione del sistema velivolo come unione di sottosistemi (Airframe, Propulsore, Sistema di Produzione di Energia Elettrica, Sistema di Produzione di Energia Idraulica, Sistema Carrelli di Atterraggio, Sistema Controllo di Volo, Sistema per la Navigazione, Sistema di comunicazione e trasmissione dati), ha mostrato la piena compatibilità delle prestazioni del velivolo con i requisiti imposti
Project “Archaeological Map of Italy - Forma Italiae”: Landescape of Daunia: Ager Lucerinus
No full textMistuning effects evaluation on turbomachine dynamic behaviour using genetic algorithms
Full text linkThis paper presents a new approach to evaluating the mistuning effects on turbomachinery blades that is classified
as neither deterministic nor statistical — it is based on the employment of genetic algorithms. A genetic algorithm
has been exploited to find the structurally mistuned configuration that leads to the maximum value of blade
vibration amplitude for an assigned domain of variations. A test case has been fixed and subjected to an assigned
forcing field; the target of the test case was to perform a smart search of the worst mistuned configuration. The test
case was a twenty-blade disc on which one thousand forced frequency response analyses have been performed. A
comparison with the results, based on the Monte Carlo methods, proved the suitability and the relevance of the
proposed approach. The investigation has demonstrated the applicability of this new possible engineering approach
to the study of systems with uncertain properties
Going Beyond Counting First Authors in Author Co-citation Analysis
Full text linkThe present study examines one of the fundamental aspects of author co-citation analysis (ACA) - the way co-citation
counts are defined. Co-citation counting provides the data on which all subsequent statistical analyses and mappings
are based, and we compare ACA results based on two different types of co-citation counting - the traditional type that
only counts the first one among a cited work's authors on the one hand and a non-traditional type that takes into
account the first 5 authors of a cited work on the other hand. Results indicate that the picture produced through this non-traditional author co-citation counting contains more coherent author groups and is therefore considerably clearer. However, this picture represents fewer specialties in the research field being studied than that produced through the traditional first-author co-citation counting when the same number of top-ranked authors is selected and analyzed. Reasons for these effects are discussed
Variations on the Author
Full text link“Variations on the Author” discusses two of Eduardo Coutinho’s recent films (Um Dia na Vida, from 2010, and Últimas Conversas, posthumously released in 2015) and their contribution to the general question of documentary authorship. The director’s filmography is characterized by a consistent yet self-effacing form of authorial self-inscription: Coutinho often features as an interviewer that rather than express opinions propels discourses; an interviewer that is good at listening. This mode of self-inscription characterizes him as an author who is not expressive but who is nonetheless markedly present on the screen. In Um Dia na Vida, however, Coutinho is completely absent form the image, while Últimas Conversas, on the contrary, includes a confessional prologue that moves the director from the margins to the center of his films. This article examines the ways in which these works stand out in the filmography of a director who offers new insights into the notion of cinematic authorship
Appropriate Similarity Measures for Author Cocitation Analysis
Full text linkWe provide a number of new insights into the methodological discussion about author cocitation analysis. We first argue that the use of the Pearson correlation for measuring the similarity between authors’ cocitation profiles is not very satisfactory. We then discuss what kind of similarity measures may be used as an alternative to the Pearson correlation. We consider three similarity measures in particular. One is the well-known cosine. The other two similarity measures have not been used before in the bibliometric literature. Finally, we show by means of an example that our findings have a high practical relevance.information science;Pearson correlation;cosine;similarity measure;author cocitation analysis
Improvement and Validation of a Method for the Determination of Low Molecular Weight Phenols in Grape Skins
No full textDispelling the Myths Behind First-author Citation Counts
Full text linkWe conducted a full-scale evaluative citation analysis study of scholars in the XML research field to explore just how different from each other author rankings resulting from different citation counting methods actually are, and to demonstrate the capability of emerging data and tools on the Web in supporting more realistic citation counting methods. Our results contest some common arguments for the continued
use of first-author citation counts in the evaluation of scholars, such as high correlations between author rankings by first-author citation counts and other citation
counting methods, and high costs of using more realistic citation counting methods that are not well-supported by the ISI databases. It is argued that increasingly available digital full text research papers make it possible for citation analysis studies to go beyond what the ISI databases have directly supported and to employ more
sophisticated methods
- …
