1,721,007 research outputs found
Fabbriche della conoscenza. Roma Tre nel territorio e nella riqualificazione dell’area Ostiense
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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
Studi preliminari sulla propagazione gamica e vegetativa di Hypericum perforatum in ambiente mediterraneo
No full textLa conoscenza dei fattori che influenzano la propagazione di una specie rappresenta un passo cruciale nella messa a punto di strategie per la sua moltiplicazione di massa e introduzione in coltura, sia in campo che in ambiente controllato. Sono stati approfonditi alcuni aspetti della propagazione gamica di Hypericum perforatum (di cui è nota la bassa germinabilità del seme), verificando in particolare gli effetti di variabili diverse (soddisfacimento delle esigenze in freddo, temperatura, substrato, presenza di PGPR, batteri promotori della crescita). Sono stati inoltre approfonditi gli studi sulle potenzialità di moltiplicazione vegetativa della specie, da proporre come possibile alternativa all’impiego del seme. Sono state pertanto prelevate talee semilegnose da piante di H. perforatum al secondo anno di vita, successivamente poste a radicare su tre diversi substrati, con e senza l’impiego di un ormone radicante (NAA). Al termine della prova sono stati rilevati percentuale di radicazione, lunghezza e peso (fresco e secco) delle radichette. I risultati ottenuti hanno mostrato il positivo effetto della vernalizzazione sulla germinazione in tutte le condizioni sperimentali, mentre la prova di moltiplicazione agamica ha evidenziato un diverso comportamento rizogeno in funzione del substrato impiegato.The knowledge of the factors that can influence the propagation of a plant species is a key factor in the pointing out of strategies for its mass multiplication and cropping, both in open field and in controlled conditions. Some aspects of sexual multiplication of Hypericum perforatum (dealing with a generally low seed germinability) have been studied, firstly verifying the best seed germination conditions, in relation to temperature, growth substrate, pre-chilling and presence/absence of PGPR (Plant Growth Promoting Rhizobacteria). Furthermore, the potentialities of vegetative multiplication for the species were studied, with the aim to suggest this technique alternatively to the use of seeds. The trial about vegetative multiplication was performed picking up semi-woody cuttings from 2-years-old H. perforatum individuals. The cuttings were put for rooting into three different substrates, with and without the use of a rooting hormone (NAA – Naphtalenacetic acid). The rooting rate of cuttings was evaluated, and the produced roots were counted and measured as for length and fresh and dry weight. The results obtained have shown the positive effect of pre-chilling on the germination percent in all experimental conditions, whereas the trial about vegetative propagation has shown a different roots emission rate with varying the used substrate
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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