1,720,957 research outputs found
Un’analisi critica delle risposte ultrasonore ottenute da difetti artificiali e cricche di fatica
No full textNel campo delle PnD, le relazioni quantitative tra la risposta del metodo adottato e la dimensione del difetto sono tipicamente fornite o ricavate in funzione di una opportuna dimensione lineare (profondità, diametro,...) del difetto stesso. Esempi di tali relazioni sono le curve “Probability of Detection”, le curve ADA per il metodo UT o i limiti di accettabilità del metodo PT applicato alle saldature.
La presente memoria analizza le risposte UT ottenute sperimentalmente da cricche di fatica generate su assili ferroviari e le confronta con quelle ricavate da difetti artificiali di forme significativamente differenti ottenuti mediante lavorazioni tradizionali (fori e fresate) o innovative (difetti concavi o convessi per elettro-erosione). Le misure sono state eseguite sia mediante sonde tradizionali monocristallo, sia mediante un sistema phased array. L’elaborazione dei risultati sperimentali ha permesso di osservare che le curve ottenute dai difetti artificiali, significativamente differenziate se diagrammate in funzione della profondità del difetto, collassano su una singola curva, corrispondente a quella delle cricche di fatica, se diagrammate in termini di area riflettente. Tale risultato permette di ripensare in un’ottica completamente nuova la forma dei difetti artificiali adottabili, ad esempio, in blocchi campione per la taratura dei sistemi UT per l’ispezione di assili ferroviari sia in fase di produzione, sia di manutenzione durante il normale esercizio
Why is my car less mine? The emergence of user-led business models and insights from the Italian carpooling market
No full textThis paper contributes to the existing user-led business model innovation literature providing a theoretical framework of nine key-points a firm should look at while implementing such kind of business model. In order to understand the role of these elements in user-led innovations, we analyse an example considering a new emerging phenomenon, carpooling, focusing on what is happening in the Italian market and how the key players are structuring their business models
Going Beyond Counting First Authors in Author Co-citation Analysis
Get PDFThe 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
Get PDF“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
Get PDFWe 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
Orbiting space hotel
No full textThis contribute will provide a road map of choices and indications for the creation of an integrated solution
for an orbiting space hotel, retracing out steps in all the phases of the project, from the demand side to
the detailed analysis of out responses to a series of peculiar issues and constraints
Dispelling the Myths Behind First-author Citation Counts
Get PDFWe 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
koamabayili/VECTRON-author-checklist: VECTRON author checklist
No full textWe have done our best to complete the author checklist relating to the use of animals in the hut study. Note that the objective for the hut study was to evaluate the IRS treatment applications for residual efficacy against Anopheles mosquitoes, including the local An. coluzzii mosquito population. Cows were only used to attract mosquitoes into the huts and no tests were carried out directly on the cows. The author checklist is intended for use with studies where experiments are carried out on animals, which is why we have had such difficulty in completing this for the hut study, as many of the questions do not relate to how the cows were used
- …
