1,720,968 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
Adhesion and hardness of ZrN films sputtered on WC substrates
No full textZirconium nitride (ZrN) is a transition metal nitride widely studied to be used in different technological fields, like protective coatings and optoelectronics. High hardness, strong wear resistance, chemical stability and high corrosion resistance make transition metal nitride films suitable for tribological applications. For this kind of applications it is essential to evaluate and to control the film adhesion to the coated tool and its hardness properties. In this work ZrN films were RF-sputtered on WC–wt.10 % Co substrates using different assistance bias voltages (up to 20 V) applied during the film growth. The structural properties of the obtained coatings were analysed using x-ray diffraction (XRD) measurements. It was found that the substrate bias strongly influenced the incorporation of residual oxygen impurities in the films. A structural switch from the (200) to the (111) preferential crystal structure was detected with the increasing bias voltage. In addition, transmission electron microscopy (TEM) analyses showed some twinning features inside the deposited films. The film properties were correlated to the film adhesion, studied by scratch test, and to their wear resistance, carried out by ball-on-disc tribometry. The maximum obtained critical load was about 70 N and the wear rate was about 2.23*10^-6 mm3/Nm. Nanoindentation measurements is in progress in order to correlate them with the structural features and wear resistance properties of the grown films
Rivestimenti ceramici per utensili da taglio
No full textTramite prove di laboratorio sono state analizzate alcune proprietà tribologiche di rivestimenti ceramici per utensili
da taglio. I risultati ottenuti forniscono importanti informazioni sull’impiego dei rivestimenti nelle reali applicazioni
delle lavorazioni meccaniche
Prove di fresatura per rivestimenti a base di zirconio
No full textIn questo articolo analizziamo le proprietà
tecnologiche di rivestimenti a base di
nitruro di zirconio, di tipo sia monolayer che
multilayer nanostrutturati, depositati con un
forno da laboratorio su inserti in carburo di
tungsteno/cobalto.
I rivestimenti oggetto di questo studio
sperimentale, già sottoposti a prove di
laboratorio i cui risultati sono stati presentati
pochi mesi fa su questa stessa rivista [1],
stavolta sono stati sottoposti a prove
di fresatura frontale a secco in accordo
con la metodologia basata su standard
internazionali (ISO 8688-1) e presentata dagli
autori nell’articolo pubblicato sullo scorso
numero di “Utensili e attrezzature” a febbraio
2011. L’obiettivo ultimo è quantifi care la vita
utile degli utensili da taglio rivestiti attraverso
la misura dell’evoluzione temporale della
curva d’usura e individuare possibili
correlazioni tra i risultati delle prove di
laboratorio e le prove sul campo al fi ne di
spiegare le prestazioni tecnologiche degli
utensili rivestiti e l’eff etto dell’adozione
di diff erenti strutture di rivestimento
(monolayer o multilayer) e/o diff erenti
parametri del processo deposizione
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
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
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