1,720,969 research outputs found
Tool Wear in Stone Cutting: Theoretical Model and Experimental Validation
No full textTool behaviour in stone cutting is a complex problem which, up to now, has been treated in literature mainly by empirical models. The study of a wear model is very important in order to set up methods of selection of both tools and machining conditions.
In this work a semi-empirical approach is proposed to study the wear of metal-bonded diamond tools. A theoretical model, that was already presented in a previous work, is further refined on the basis of experimental results concerning the wear of diamond end mills. The model is based on the assumption that the tool wear rate depend on two basic factors: the former being only a matrix characteristic and the latter only a grain characteristic, both to be determined experimentally. In this work it is shown how the parameters of the model can be deduced from experimental tests where the trend of micro-geometric features have been measured. The analytical results obtained form the model can give an useful aid in the interpretation of the wear phenomenon; however they can be also used to establish criteria for planning experimental tests in order to obtain a semi-empirical model able to predict the tool behaviour and life
Indagine sull’eventuale impatto idrogeologico prevedibile con la realizzazione della galleria servizi e dell’ampliamento dei laboratori sotterranei del Gran Sasso
No full textIndagine sull'impatto idrogeologico delle opere in sotterraneo sull'acquifero del Gran Sasso: revisione dei dati esistenti e nuove considerazioni.
No full textIndagine sull’Idrogeologia del Massiccio del Gran Sasso. Revisione dei dati esistenti e nuove considerazioni
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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
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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