1,720,960 research outputs found
Combustibili e lubrificanti per motori diesel marini: problematiche, normative, sperimentazioni
No full textVengono presentate le tematiche legate al funzionamento dei motori diesel navali della attuale generazione dal punto di vista della compatibilità tra combustibili e lubrificanti; viene presentate altresì le attrezzature sperimentali in via di utliizzo presso l'Istituto Motori di Napoli per verificare il funzionamento di un motore diesel alimentato con nafta pesante e lubrificato con oli di TBN idoneo ad attenuare gli effetti corrosivi dovuti all'acidità nella camera di combustion
Experimental investigations of the impact of heavy fuel oil on marine diesel engines
No full textAn overview is given of the situation of fuels, rules, coming standards (ISO-CIMAC, in particular) that regard the naval field; a new experimentation is presented with the aim of studying the compatibility betwee actual fuels and lubricant
Environmental impact of exhaust emissions of marine diesel engine
No full textThe main aim is to focus on the various aspects of the pollution caused by marine engines distinguishing them from those caused by road traction, proposing those approach to the problem that are possible nowadays, while considering the complexity and the great variety of engines used in this secto
The problem of exhaus emissions of marine diesel engines
No full textAn overview of the environmental pollution due to the naval operations is given with the aim of supply some indications for the regulation coming in this sector; also indications are given on how to transfer the knowledge which is on the basis of the terrestrial regulations to the marine field
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
- …
