1,721,019 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
Assessing the Environmental Status of five Sardinian black corals forests via Mesophotic Assemblages Conservation Status Index (MACS)
No full textMarine animal forests are important mesophotic habitats threatened by an increasing number of natural and human pressures. Although several international agreements aim to protect these vulnerable ecosystems, the Environmental Status of most of these benthic animal-structured habitats remains unknown. Based on ROV footage, we evaluated the Environmental Status of 5 black corals forests in the center of the Western Mediterranean Sea, through the Mesophotic Assemblages Conservation Status (MACS) Index. The MACS index combines two independent indices: the Index of Status of the benthic communities, analyzing conspicuous species diversity, basal layer and canopy composition; the Index of Impact, analyzing siltation level, canopy condition and marine litter occurrence. The five investigated sites are characterized by the presence of two Antipatharians, Antipathella subpinnata and Leiopathes glaberrima, dwelling in different environmental conditions. Four sites showed high and good values of the Index of Status, and only one site showed a moderate status. Regarding the Impact Index, four sites were classified with low values, except one showed a very low value. Overall, four black forests were classified in a Good and one in a Very High Environmental Status. Assessing the Environmental Status is the first step needed to monitor these essential habitats' health over time and improve the current frameworks for their conservation and protection, such as the Marine Strategy Framework Directive
Small-scale distribution of metazoan meiofauna and sedimentary organic matter in subtidal sandy sediments (Mediterranean Sea)
Full text linkWhile variations in sedimentary organic matter (OM) quantity, biochemical composition and nutritional quality as well as in meiofaunal abundance and assemblage composition at the macro- and mesoscale are relatively well known, information about variations at the microscale is much scarcer. To shed some light on this issue, we tested the null hypothesis by which abundance and composition of the meiofaunal assemblages, and the quantity, biochemical composition and nutritional quality of sedimentary organic matter in coastal shallow environments do not vary within a frame of 1 m2. No significant variation within the frame emerged for OM quantity, nutritional quality, biochemical composition and the abundance of meiofaunal assemblages. On the other hand, the composition of meiofaunal assemblages varied significantly within the frame and exhibited a clear segregation of assemblages farther to the shore, as a likely result of local micro-hydrodynamic conditions. Spatial autocorrelation analysis revealed that lipid and protein sedimentary contents had a random distribution, whereas carbohydrate and biopolymeric C contents and meiofaunal total abundance were characterized by a patchy distribution, with discrete peaks within the sub-frame squares (ca. 0.1 m2). Phytopigments showed a spatial positive autocorrelation distribution, following the micro-hydrodynamic pattern, with patches larger than the sub-frame square, but smaller than the entire one (1 m2). Overall, our results suggest that, within 1 m2 of subtidal sandy sediments, three replicates could be sufficient to assess correctly OM attributes and the abundance of meiofauna, but could be possibly inadequate for assessing meiofaunal assemblages’ composition at a finer scale (<1 m2)
Non Linear Analises of R/C Building Frame with Hysteretic Energy Dissipating Bracing System
No full textThis article focuses on the comparison between the results of non-linear static analysis (NLSA) and non-linear dynamic analysis (NLDA), performed on a benchmark structure by using two different finite element programs (CDS-Win and SAP2000). The benchmark structure was a 3 storey reinforced concrete frame existing building, regular in elevation and plan and located in a high seismic zone. The structure was retrofitted by introducing a hysteretic energy dissipation bracing system sized by means of a Focus–Displacement Design procedure based on NLSA. The NLDA have been performed using a set of artificial earthquakes comprising of 7 spectrum-compatible accelerograms selected in order to match, on average, the design spectra. In order to verify the effectiveness of the CDS-Opensees and to demonstrate its computational advantages in case of r/c building frame with hysteretic bracing system, in this contribution the results of both NLSA and NLDA are detailed
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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