1,720,985 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
Cation order in omphacitic clinopyroxenes: implications for Raman elastic geothermobarometry
No full textOmphacite is a common mineral found in many geological settings, thus its widespread occurrence makes it a valuable candidate for Raman elastic geothermobarometry. This approach uses the deformation recorded by mineral inclusions to determine the pressure and temperature conditions under which they were entrapped [1]. Raman scattering, highly sensitive to structural deformations, provides crucial insights into crystal structure variations that occur due to heating or compression. While many host-inclusion systems have been studied, clinopyroxene inclusions remain relatively unexplored. Therefore, accurate calibration of Raman-peak positions against hydrostatic pressure is essential for applying Raman elastic geobarometry to omphacites in different mineral hosts.
Natural omphacite crystals exhibit cationic ordering associated with crystallization temperature, which affects their elastic properties. To investigate these aspects, in situ high-pressure Raman spectroscopy measurements were performed on natural ordered and experimentally disordered omphacites from Münchberg Massif (Germany). By examining omphacite crystals with varying degrees of order achieved through isothermal annealing experiments, it was observed that increasing cationic disorder leads to peak broadening, while pressure variations influence Raman peak positions. However, the peak position is also affected by the chemical composition. Therefore, Fe3+-rich crystals from Lugros and Camarate (SE Spain), and Voltri massif eclogites (Italy), already characterized by single crystal X-ray diffraction [2], along with synthetic Fe-free omphacites [3], were analyzed, as an initial step towards the chemical calibration of omphacites using Raman spectroscopy.
By considering the influence of chemical composition and cationic ordering, we have expanded our understanding of the elastic behavior of omphacite obtained through Raman spectroscopy and its potential use for geobarometric calculations, important for determining the pressure and temperature conditions involved in geological processes where omphacite growths.
References:
[1] Angel R J et al. (2019) Z Kristallogr Cryst Mater 234(2):129-140
[2] Cámara F (1995) PhD thesis, University of Granada, 504 pp.
[3] Pandolfo F et al. (2015) Phys Chem Minerals 42:1-1
Simultaneous voltammetric determination of heavy metals in food and environmental matrces. Critical comparison with atomic absorption spectroscopy.
No full textSimultanea determinazione mediante square wave anodic stripping voltammetry di "platinum group metals (PGMs)" e Pb in matrici ambientali
No full textIl presente lavoro, riguarda la determinazione di Pt(II), Pd(II), Rh(III) e Pb(II) mediante voltammetria di ridissoluzione anodica ad onda quadra (SWASV).
La procedura analitica è stata verificata mediante l’analisi di materiali standard di riferimento.
La precisione e l’accuratezza, espresse rispettivamente come deviazione standard relativa ed errore relativo, sono risultate inferiori al 6 % in tutti i casi.
Viene valutata la possibilità di usare l’area di picco come parametro strumentale1. Sono valutate inoltre le possibili interferenze2. Una volta messa a punto su soluzioni acquose di riferimento e verificata su materiali standard di riferimento, la procedura analitica proposta è stata trasferita ed applicata su campioni reali prelevati in ecosistemi diversamente influenzati dal traffico veicolare.
Nel presente lavoro viene anche discusso un confronto critico con misure spettroscopiche effettuate sugli stessi campioni.
1. C. Locatelli, C. Electroanalysis 2003, 15, 1397-1402.
2. C. Locatelli, C.; G. Torsi, G. J. of Electroanal. Chem. 2001, 509, 80-89
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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