1,721,008 research outputs found
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
Evaluation of organic growing media and bio-control agents in the production of certified citrus rootstocks
No full textEffects of organic fertilisation on ‘Valencia late’ orange bearing trees
No full textIn a study realised over a three year period on orange bearing trees (Citrus sinensis (L.) Osbeck) ‘Valencia late’, grafted on sour orange (C. aurantium L.), the effect of organic fertilisers (OF) on plant nutrition and performance was verified. In a randomized block experimental design, four treatments were compared, namely: mineral fertiliser (MF) treatment adopted as control, citrus byproduct compost (CB), poultry manure (PM) and livestock waste compost (LW). The trees, with the exception
of (MF) treatment, were organically grown since 1994 in the experimental farm of
CRA-ACM in Lentini, Sicily, and received the same N input every year. Significant differences for micronutrients (Fe, Mn, Zn) were noticed in leaf analyses, whereas no difference was found between treatments for leaf macronutrient content. The δ15N detected in leaves, proteins of pulp and amino acids of juice showed the lower level in MF, an intermediate value in CB and the highest level in animal derived fertilisers treatments (PM and LW). Fruit of the CB treatment showed values of total soluble solids and total acidity significantly lower than other treatments. Orange peel Chroma C* in CB and MF was higher than in PM and LW treatments. Discriminant analysis of the leaf and fruit analytical data set successfully separated treatments. First discriminant canonical function explains the 96,9% of the variability, with highly significant Wilks’ lambda. Cross validation classified correctly all MF and CB samples, whereas PM and LW in few cases were mixed up
Risposta dei bioindicatori della qualità del suolo alla diversa fertilizzazione di un aranceto nell’ Italia Meridionale
No full textLo scopo della ricerca è stato quello di valutare i cambiamenti indotti dalle diverse tipologie di fertilizzazione sui parametri chimici e biologici di un suolo. Il suolo dell’agro di Lentini (SR, Sicilia), coltivato ad arancio da oltre 50 anni, a partire dal 1995 secondo il metodo biologico , omogeneo per portinnesto e cultivar, è stato addizionato con 4 diversi tipi di fertilizzanti (pollina, minerale, compost da pastazzo e letame). Quattro profili di suolo, ciascuno per tipo di fertilizzazione, sono stati campionati e studiati secondo la sequenza degli orizzonti genetici. In totale 18 campioni orizzonte-specifici di suolo sono stati prelevati e sottoposti ad analisi per valutare il contenuto in C organico totale, estraibile e della biomassa microbica, N totale, ammoniacale e nitrico. L’attività della biomassa microbica è stata valutata determinando la quantità di CO2 emessa durante 30 giorni di incubazione a condizioni controllate. Inoltre, sono stati determinati gli acidi grassi dei fosfolipidi (PLFA), che comprendendo dei biomarkers specifici della biomassa batterica e fungina, hanno permesso di evidenziare variazioni della struttura delle comunità microbiche. Nel presente lavoro sono illustrati e spiegati i risultati della suddetta ricerca
Partial root-zone drying irrigation in orange orchards: Effects on water use and crop production characteristics
No full textDispelling 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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