1,721,093 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
Lead-bismuth eutectic: Atomic and micro-scale melt evolution
Full text linkElement clustering and structural features of liquid lead-bismuth eutectic (LBE) alloy have been investigated up to 720 ffiC by means of high temperature X-ray diffraction (HT-XRD), X-ray Photoemission Spectroscopy (XPS) and Scanning Photoemission Microscopy (SPEM) at the Elettra synchrotron in Trieste. The short-range order in liquid metal after melting corresponds to the cuboctahedral atomic arrangement and progressively evolves towards the icosahedral one as temperature increases. Such process, that involve a negative expansion of the alloy, is mainly connected to the reduction of atom distance in Pb-Pb pairs which takes place from 350 ffiC to 520 ffiC. On an atomic scale, it is observed a change of the relative number of Bi-Bi, Pb-Pb, and Pb-Bi pairs. The Pb-Bi pairs are detected only at a temperature above ~350 ffiC, and its fraction progressively increases, giving rise to a more homogeneous distribution of the elements. SPEM results showed evidence that the process of chemical homogenization on an atomic scale is preceded and accompanied by homogenization on micro-scale. Clusters rich of Bi and Pb, which are observed after melting, progressively dissolve as temperature increases: Only a few residuals remain at 350 ffiC, and no more clusters are detected a 520 ffiC
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
Initial Oxidation of a Rh(110) Surface using Atomic or Molecular Oxygen and Reduction of the Surface Oxide by Hydrogen
No full textIntermetallics as key to spiral formation in In–Co electrodeposition. A study based on photoelectron microspectroscopy, mathematical modelling and numerical approximations
No full textThis paper reports on spiral pattern formation in In–Co electrodeposition. We propose an
approach to the understanding of this process based on: (i) compositional and chemicalstate
distribution analysis by high-resolution photoelectron microspectroscopy and (ii) a
mathematical model able to capture the morphological features highlighted in the experiments.
Microspectroscopy—complemented by electrochemical, structural and morphological
characterisations—combined with mathematical modelling, analytical and numerical
investigations, converge in pointing out the key role played by intermetallic electrodeposition
in spiral formation
Manganese vanadium sulfate-oxide cylindrical core-shell heterostructures by electro-spray deposition on graphite foil for Li+ ion intercalation
No full textHeterostructure based on metal sulfides and oxides nanomaterials can be
relevant to the charge storage devices. Here, we show that
Mn(CH3COO)(2)center dot 4H(2)O and VOSO4 center dot xH(2)O can react in
ethanol/water droplets generated by an electric field assisted spray
system, so that MnSx-VSx/MnzV(2)O(5) heterostructures in the shape of
nanometric cylindrical particles can be deposited on a graphite foil
substrate. The composite material phases were detected by several
microscopies and microscopic probes spectroscopies, i.e., micro-Raman
and scanning X-ray photoemission microscopy. The nanometric cylindrical
particles were relatively homogenously distributed throughout the film
covering the graphite foil. Film thickness modulation on surface was
calculated between 100 and 300 nm range. We show that the segregation of
MnV-O and MnV-S relative abundance in the internal and external volume
of the cylindrical nanoparticles respectively, can be exploited during
faradaic and non-faradaic processes in charge/discharge. (C) 2021
Elsevier B.V. All rights reserved
Spectromicroscopy of interfaces with synchrotron radiation:: multichannel data acquisition
No full textProbed length scales of sub-micrometer dimensions have been achieved in photoemission spectroscopy owing to the
high flux and brightness of the soft X-rays provided by the third generation synchrotron sources and the progress in
microfabrication of focusing elements for soft X-rays. The use of multichannel detectors in the recently constructed
scanning photoelectron microscopes adds speed and flexibility in data acquisition. Here we present some results
obtained with the scanning photoemission microscope at ELETTRA illustrating the importance of the multichannel
data acquisition for the interpretation of the data
Intermetallics as key to spiral formation in In–Co electrodeposition. A study based on photoelectron microspectroscopy, mathematical modelling and numerical approximations
No full textThis paper reports on spiral pattern formation in In–Co electrodeposition. We propose an
approach to the understanding of this process based on: (i) compositional and chemicalstate
distribution analysis by high-resolution photoelectron microspectroscopy and (ii) a
mathematical model able to capture the morphological features highlighted in the experiments.
Microspectroscopy—complemented by electrochemical, structural and morphological
characterisations—combined with mathematical modelling, analytical and numerical
investigations, converge in pointing out the key role played by intermetallic electrodeposition
in spiral formation
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