1,720,969 research outputs found
A New Concept of Direct Oil Cooling System for AFPM Machines, Numerical Analysis and Optimization
Full text linkGiven the strong growth of the electric drive industry, the automotive sector needs to increase the power density of its motors, leading to a size decrease and, consequently, to economic savings. The increase in power density brings with itself the consequence of increasing the Joule effect losses in the active conductors of the machine. For this reason, the problem of cooling turns out to be of utmost importance precisely because of its direct coupling with mechanical and electromagnetic design. This paper has the aim to perform a CFD analysis concerning the cooling system of a permanent magnet axial flux electric machine. The innovative cooling system studied is a direct one which takes advantage of oil to cool down the DC powered coils. The innovation brought by the present research lays in both the direct axial ejection and the use of oil as coolant. At the current state of art, the coolant flows tangentially and, moreover, water is usually employed instead of oil. The main aim of this analysis will be, after a validation of the numerical code by comparison of the literature data, to minimize the maximum temperature of the coil by means of the proper positioning of the nozzle. © 2024 Institute of Physics Publishing. All rights reserved
Una signoria ai confini della Massa Trabaria: i Brancaleoni di Castel Durante (XIII-XV secolo)
No full textSignoria e confini: entro questa mobile relazione si colloca il testo . Lo spazio geografico e politico preso in esame è quello in cui si svolse la parabola storica della signoria dei Brancaleoni, fra l’incerta genesi nel XIII secolo, la forte ascesa trecentesca e il rapido declino nella prima metà del Quattrocento. L’area su cui si proiettò l’egemonia della famiglia ebbe come baricentro l’alta valle del fiume Metauro e trovò il fulcro nel centro eponimo di Castel Durante, oggi Urbania: su questo agone territoriale insisteva una griglia di confini amministrativi e religiosi già molto fitta nel primo Duecento. Nel combinarsi di fattori geografici, politici ed economici, il potere signorile agì come catalizzatore nel continuo processo di rigenerazione di confini, fra Tre e Quattrocento: alcuni di questi progressivamente scolorirono, mentre altri nuovi vennero a crearsi e a sovrascriversi. Si trattò di un processo animato, di concerto o in opposizione ai signori durantini, da un vasto e variegato campo di forze: lo Stato della Chiesa con i suoi ordinamenti territoriali, i potentati dell’area appenninica in costante competizione – i conti di Montefeltro, accanto a una pletora di signorie minori – ma anche da città lontane, come Perugia e Firenze. L’interazione fra queste forze produsse una costante dialettica fra le vicende del dominato dei Brancaleoni e il rimodellamento dei confini, che il testo si propone di indagare
«Eadem ratio sit in omnibus». La diocesi, il piviere e la parrocchia: i confini e la normativa ecclesiastica (secc. V-XIII)
No full textStudio dell'evoluzione della normativa in materia di confinanzione delle circoscrizioni ecclesiastich
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
I conti Alberti dalla dimensione regionale alla signoria appenninica
No full textI conti Alberti dalla dimensione regionale alla signoria appenninic
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
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