1,721,026 research outputs found
Improving reliability of a composite wing structure (Miglioramento dell’affidabilità di un’ala in composito)
No full textKnowing the inherent risk of failure in any design is becoming increasingly important to both the manufacturer and the customer. Unfortunately current aerospace design analysis methods do not directly account for the random nature of most input parameters. This is particularly true for composites. Inherent variabilities in the manufacturing and assembling processes are not always known or characterized. It is however clear that new aircraft developments (e.g. reusable launch vehicles, high-speed civil transports) can only be successful if consistent changes in the traditional design procedures are made. In the current design process, the effect of these variabilities on the structural performance cannot be accurately assessed and is hence compensated for by applying safety factors. This is not an ideal situation, as it may lead to slightly over-designed structures. In order to integrate the simulation environment and the production variability, a much more promising approach has been worked out that includes probabilistic models of design variables into the mechanical simulation process. In this way, real variability of design parameters can be taken into proper account in the simulation environment and then used to assess structural reliability.
It is, in fact, vital to better understand how scatter in physical properties affects the behavior of a composite structure, and to assess which physical properties are most critical. When accurate stochastic descriptions of physical properties are available, these can be integrated into the design process of composite structures, and a control and optimization tool can be developed to avoid unnecessary weight increase, to reduce allowable knockdown factors and to correctly re-define inspection intervals
Bianca Beccalli (1938-2024). Tra sociologia, femminismo e impegno per il cambiamento sociale
Full text linkAffascinante. Questo è ciò che pensai quando la conobbi circa trentacinque anni fa. Ricordo perfettamente il momento. La mitica aula 1 (ora completamente trasformata) di Scienze Politiche a Milano. C’era un’assemblea, come usava allora. Forse nei giorni dell’occupazione del Movimento della Pantera? Non saprei dirlo con certezza. So solo che ho un ricordo indelebile di quel breve scambio di convenevoli, un momento di per sé come tanti, privo di eccezionalità e quindi potenzialmente dimenticabile, se non fosse stato per il suo straordinario carisma.
Poi i percorsi biografici mi portarono via dalla mia città, e instaurammo rapporti di lavoro e di amicizia solo molti anni dopo, quando il mio coinvolgimento attivo nello sforzo di rendere gli studi di genere più visibili nell’accademia italiana, insieme a colleghe-amiche ancora oggi al mio fianco in uno stimolante rapporto di sorellanza, divenne preponderante.
E il repertorio di aggettivi si infittì. Ancora affascinante. Ma anche: intelligente, coltissima, raffinata, autoironica, amante della vita, forte, cosmopolita, sorridente, anti-barona, generosa
Ottimizzazione robusta della vita a fatica di una sospensione mediante simulazione multibody
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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
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