1,720,961 research outputs found
Going Beyond Counting First Authors in Author Co-citation Analysis
Get PDFThe 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
Get PDF“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
Get PDFWe 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
Dispelling the Myths Behind First-author Citation Counts
Get PDFWe 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
Porting PVM to a Shared-Memory Industrial Multiprocessor
No full textThe paper presents the experience of porting the PVM message-passing environment to EMMA2E, an industrial, shared-memory multiprocessor architecture. The work is still ongoing in the framework of the ESPRIT "EUROPORT2" project, aiming to demonstrate practical availability of portable parallel applications with related industrial and commercial benefits. The project framework, the EMMA2E architecture and the related system software are briefly introduced, followed by the main features of PVM porting solution. This last especially aims to join PVM general and portable programming model with the run-time efficiency achievable in a sharedmemory environment. 1. EUROPORT2 and PULSAR EUROPORT2 is a project in the ESPRIT III framework, aiming to develop portable parallel applications in order to demonstrate that parallel computing may be employed in industrial and commercial environments on a large scale
Inorganically and organically modified mineral clays: a sustainable approach in the control of the olive tree fly pest, Bactrocera oleae
No full textThe most relevant phytophagous insect associated with olive tree plantations throughout the Mediterranean area is Bactrocera oleae, the olive tree fly. Innovative and environmentally-friendly methods for the mitigation of such pest have been attracting an ever-increasing attention, especially after 2014, when the whole Italian olive oil production suffered from dramatic losses.
Novel prevention strategies should meet four main criteria: toxicologic safety, environmental selectivity and compatibility, pest-control efficiency and economic sustainability.
In this aim, two series of solids showing a detrimental effect on the life cycle of Bactrocera oleae have been designed and prepared, i.e. montmorillonite-based clays from mineral origin containing: i) Group 11 transition metal cationic species, such as Cu(II) and Ag(I) or ii) polyphenolic organic compounds derived from olive mill waste waters. The bioactive solid materials have been prepared either by ionic exchange from aqueous solutions of sulfate or nitrate metal precursors at various concentrations or by impregnation of the polyphenol-containing effluents onto the clay support, respectively (Scheme 1).
In the case of metal-based solids, by optimising the ion-exchange procedure, a fully adequate bioactive metal content was reached for practical purposes, although reducing by more than 80% the use of precursor salts with respect to the current state of the art (1). These materials contain approx. 5 wt.% of active metal and possess acid sites, which not only, when dispersed on the fruit surface, inhibit the egg-laying activity of flies into the olives, but also catalytically-active metal cation sites with enhanced biocide effect against parasites of several crops (2). In polyphenol-modified solids, on the other hand, amounts of organics in the range of 0.9-2.6 wt.% can be deposited. Thanks to the immobilisation within the interlayer spaces of the clay, lower concentrations of bioactive species may be applied onto the olive tree, thus reducing the potential undesired dispersal of the active molecules into the environment. In order to evaluate the performance of the most promising solids in open-field tests, two sets of experimental campaigns have been carried out on olive tree orchards in Southern Tuscany, in summer 2015 and 2016.
Preliminary promising results have been obtained with Cu(II) species and with aqueous-phase olive mill wastewaters deposited onto bentonite-like montmorillonite clays, in terms of reduction of both fly infestation and damages on the olive fruit. These materials have indeed proved to be easily prepared, cost effective, environmentally friendly, stable to rainwater leaching, toxicologically safe and led to a remarkable diminution in the use of bioactive species for on-field applications.
References: 1. Baker, H. Desalination, 244 (2009) 48. 2. Belcari, A., Bobbio, E., Informatore Fitopatologico, 12 (1999) 52
koamabayili/VECTRON-author-checklist: VECTRON author checklist
No full textWe have done our best to complete the author checklist relating to the use of animals in the hut study. Note that the objective for the hut study was to evaluate the IRS treatment applications for residual efficacy against Anopheles mosquitoes, including the local An. coluzzii mosquito population. Cows were only used to attract mosquitoes into the huts and no tests were carried out directly on the cows. The author checklist is intended for use with studies where experiments are carried out on animals, which is why we have had such difficulty in completing this for the hut study, as many of the questions do not relate to how the cows were used
Author-wise bibliometric analysis based on entropy.
No full textAuthor-wise bibliometric analysis based on entropy.</p
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