1,720,956 research outputs found
DISPOSITIVO DATORE DI COPPIA PER PROVA DI INGRANAGGI MECCANICI, ROTISMI MECCANICI E SIMILI
No full textLa presente invenzione riguarda un dispositivo che ha lo scopo di sottoporre a prova rotismi meccanici per la trasmissione di elevata potenza. L’impiego di tale dispositivo sostituisce, quindi, l’uso di freni di prova il cui impiego per elevate potenze risulta costoso e i cui ingombri sono rilevanti
New relations between professional and work’s organizations introduced by computer applications, special vessel case study
No full textAt present time the project of a naval vehicle, where with the word project we refer to all the process of design and manufacturing, especially when the vehicle offers special formal and performance characteristics, involves a number of operators that has been increasing considerably in recent decades, and this increased complexity can be correlated with dimensional and typological growth of many categories of ships. Simultaneously we are witnessing a complete new project approach, where the possibility given by the computer contribution to represent processes and results becomes crucial. The paper aims to investigate the consequences of this progress in the organization of the project and focuses on the innovative methodologies, bringing as an emblematic case the evolution of the hull study and the role of "planning matrix" that it also constitutes even on the graphic plane. The studio cases examined, which the reflections presented here refer to, are related to ships where the combination of performances and shapes takes on a particularly significant value: therefore, references are made to yachts and fast vehicles such as hydrofoils or catamarans. Finally, with special regards to Hydrofoils, the study will report a comparison made about the seakeeping and resistance of 2 different types of wings for hydrofoils, the comparison has been done at first step by using CFD calculations and then validated trough tank tests to show the validity of the results
Analisi strutturale di un timone per aliscafi
No full textAttualmente i sistemi di controllo direzionale (timone) e di stabilità (flap) dei battelli veloci per il trasporto passeggeri (HSC) sono realizzati con elementi scatolari in acciaio. Ciò è essenzialmente dovuto alle notevoli sollecitazioni idrodinamiche che tali elementi sopportano a causa dell’elevata velocità di crociera.
L’esigenza di ridurre il peso di tali elementi e di aumentarne la resistenza alle azioni corrosive esterne spinge ad una ricerca su materiali e tecnologie di fabbricazioni innovative.
In questo studio è presentato il progetto di un timone, realizzato in materiale ibrido composito e acciaio, da impiegare su un battello per trasporto veloce passeggeri
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
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
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