1,721,491 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
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
Un registro dei domenicani. Spese e consumi della comunità (1349-1351)
No full textIl contributo studia il registro di entrate e delle uscite del convento bolognese di San Domenico nel periodo compreso fra il 1349 e il 1357, prendendo in considerazione la normativa circa le spese ammesse dalle regole domenicane, la nomina e il ruolo del frate procuratore deputato all'annotazione dei movimenti economici, la struttura della fonte e le tipologia di entrate e uscite registrate. Completa il contributo l'edizione parziale della fonte
Thermoelastic and Structural Response of CoMgSiO4 Olivine to High Temperature Treatment by in situ Neutron Powder Diffraction
No full textNatural olivine, dominantly (Mg,Fe)2SiO4, is one of the most common constituent of
the upper mantle and in the Earth’s crust it is a fundamental component of igneous and
metamorphic rocks of basaltic origin. The physical and structural response of olivine
to changes of T, P and composition, yield essential information in order to determine
thermodynamic, petrological and geophysical properties of this important mineral.
Earlier neutron powder diffraction studies at high temperature in situ on natural and
synthetic Mg-Fe olivines, had revealed a very interesting behaviour of reverse ordering of the octahedral cations with temperature whereby, an initial partial segregation of Fe 2+ into site M1, is followed by a crossover with Fe 2+ strongly segregating into site M2 (and Mg in site M1) up to the highest temperatures reached in the experiments. In order to evaluate the contribution of isomorphic substitution to the activity-composition relations in this important rock-forming mineral, we undertook a study on a synthetic Co-Mg olivine therefore extending high temperature in situ investigations to a composition ruled by a transition metal indicated as having a strong site preference (for M1) in the same crystal structure. Our aim is that of evaluating the physical and crystal chemical parameters underpinning the non ideal behaviour of the olivine solid solution in response of temperature changes and isomorphic substitution. Neutron powder diffraction data were collected on the POLARIS instrument at the ISIS Facility of the Rutherford Appleton Laboratory at five temperatures ranging from RT to 1000°C. The degree of cation ordering was determined from direct measurements of site occupancies in the two octahedral M sites and described by the equilibrium constant of the exchange reaction KD expressed as:
KD = [Co(M1)*Mg(M2)]/[Co(M2)*Mg(M1)].
The refinements were very stable with no evident correlations between populations and thermal parameters in the octahedral sites. No phase transition was observed within the temperature range investigated. Axial and volume thermal expansion coefficient were calculated by weighted linear regression trough the data points at different temperatures, yielding the following values: alpha-a = 9.5(1)•10−6 , alpha-b = 12.5(1)•10−6 , alpha-c = 12.7(2)•10− 6, alpha-V = 3.51(4)•10−5 °C−1 . The thermal expansion of CoMgSiO4 appears to be strongly anisotropic (alpha-a :alpha-b :alpha-c = 1.00 : 1.32 : 1.34), similarly with what can be observed in
the iso-structural Mg-Fe-olivines. The magnitudes of the principal unit-strain coefficients (e1 , e2 , e3), between room temperature and each measured T, of the strain-ellipsoid were calculated. The unit strain ellipsoid is oriented with e1||c, e2||b, e3||a and e1 > e2 > e3 . The magnitude of all the unit-strain coefficient
slightly decreases with T up to 700C and then increases up to the maximum
temperature reached. However, each trend appears to be continuous. The thermoelastic
anisotropy, calculated on the basis of the unit-strain parameters between T0 and
each measured T, is almost maintained within the T-range investigated. The maximum
anisotropy is observed between 20 and 300 °C, with e1 : e2 : e3 = 1.38:1.33:1.00.
The HT structure refinements show that Co, despite its ionic size vs. Mg, has a marked
preference for site M1 even at high temperatures. Such “anomalous” site preference of Co in Co-Mg olivine was already reported in previous studies and two competing forces have been invoked for this site partitioning: i) the preference of cations larger than Mg for site M2 and ii) a stronger covalent bonding of the d-orbitals in transition metal cations hosted in site M1. These two conflicting effects nearly neutralise each other in the case of Fe-Mg compositions thus explaining the essential lack of Fe-Mg ordering in natural olivines. Upon heating, the Co occupancy of site M1 shows an oscillatory behaviour whereby, after a noticeable decrease up to about 300°C, it climbs back up until approximately 800°C to then decrease again by about 30% of its original value at the highest temperature reached in the experiment. This behaviour of the Co occupancy, evidenced by a KD plot vs. T, is suggestive of a strong resistance offered by Co in site M1 to thermally induced disorder
Dalla civitas al comitatus. Artigiani nel vicariato di Galliera nel tardo Trecento
Full text linkBy examining the records of the Galliera area, it has been possible to identify and follow different figures of artisans: from tailors to blacksmiths, from shoemakers to "beccari", from "pellicciai" to "strazzaroli". The casuistry is varied and overall records a certain quantitative consistency. The reporting of the work activity carried out by the protagonists of the individual cases is frequent, but not systematic. Although the sampling is limited, it was intended to give a picture of the potential offered by vicar registers in reflecting the daily life of rural communities, from which numerous artisans emerge
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