1,721,536 research outputs found
The most general ELKO matter in torsional f(R)-theories
No full textWe study f(R)-gravity with torsion in presence of the most general ELKO matter, checking the consistency of the conservation laws with the matter field equations; we discuss some mathematical features of the field equations in connection with a cosmological application
Spin fluids in Bianchi-I f(R)-cosmology with torsion
No full textWe study Weyssenhoff spin fluids in Bianchi type-I cosmological models, within the framework of torsional f(R)-gravity; the resulting field equations are derived and discussed in both Jordan and Einstein frames, clarifying the role played by the spin and the non-linearity of the gravitational Lagrangian f(R) in generating the torsional dynamical contributions. The general conservation laws holding for f(R)-gravity with torsion are employed to provide the conditions needed to ensure the preservation of the Hamiltonian constraint and the consequent correct formulation of the associated initial value problem. Examples are eventually given
Censimento dei cani delle Province di Forlì, Pesaro e Arezzo con particolare riferimento al fenomeno del randagismo.
No full textGoing 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
IL PAPAVERO DA OPPIO NELLA CULTURA E NELLA RELIGIONE ROMANA: ASPETTI SIMBOLICI E ARTISTICI
No full textThe aim of my work is to analyze from a literary, religious, iconographic and symbolic point of view the role that papaver somniferum played in Roman culture. Thanks to the amount of iconographic and literary evidence preserved till today, it is well known that the vegetal language had great importance in antiquity. Even though the topic has already been studied to gain knowledge of the different symbolic meanings used at that time, some vegetal species have been quite neglected, their analysis concentrating only on recognizing their presumed meaning, therefore providing a only superficial and simplified explanation along the lines of our modern metaphoric associations.
This happens with the opium poppy (often even mixed up with the pomegranate, at least in the iconographic field) to which the studies have attributed small importance, even though it appears, or is referred to, in various contexts: from the political-official to the celebrative-religious or the literary one. These have gradually led to changes in its meaning, enriching it with significant nuances.
The work starts with an essential, methodological introduction (called interpretatio plantarum) directed towards a close historiographical examination of the most important studies about botany in the classical world published till today. Some exceptions are made due either to the partial importance of some of these contributions or to the already prominent popularity of some others.
The real dissertation concerning the opium poppy is divided in two ample sections: the first dedicated to the analysis of all the literature quoting the plant (here Vergil and Ovid stand out among the others), the second revolving around some iconographic materials (for example: the Ara Pacis and the frescoes of Livia's villa at Prima Porta). Sculptures will not be analyzed (apart from a selection of narrative monuments) partly because of its too vast quantity of evidence but, most of all, because its iconographic features (i.e. the opium poppy) are mainly the consequence of modern restoration.
The work led to uncover new aspects, and to verify some old ones, regarding the meanings papaver somniferum had in the different contexts of roman culture. These, far from being only sterile sophistry, show how the contemporary symbolic associations and interpretations are very different from the ancient Roman ones
Dispelling the Myths Behind First-author Citation Counts
Full text linkWe 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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