1,720,992 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
Erratum: From NiMoO4to γ-NiOOH: Detecting the Active Catalyst Phase by Time Resolved in Situ and Operando Raman Spectroscopy (ACS Nano (2021) 15: 8 (13504−13515) DOI: 10.1021/acsnano.1c04126)
No full textAfter our article was published we became aware of the comprehensive and enlightening study by Liu et al.,1 which we would like to accentuate. In their work, they detect the complete reconstruction of NiMoO4·xH2O nanorods into a highly porous and loose γ-NiOOH structure by electrooxidation in 1 M KOH. By high-resolution transmission electron microscopy (HRTEM) and electron tomography analysis, they could observe that molybdenum leaching, before the oxidation of Ni2+ to Ni3+, causes an amorphous Ni−O layer. This agrees with our X-ray diffraction (XRD) data after molybdenum etching, in which no crystalline phase other than the one of flower-NiMoO4 could be detected.2 By HRTEM, they could infer that the formed γ-NiOOH nanorods are built up from nanosheets when the etching and oxidation step occur subsequently and not simultaneously, which confirms our observation of a roughened sheet-like morphology of our nanorods after catalysis. As in our work, the removal of the vibration spectra of the nanorods was detected by timeresolved in situ Raman spectroscopy measured without applied bias. However, in contrast with us, they suggest that it is the vibration environment that is responsible for the shift of the peak at 355 cm−1 to lower wavenumbers, whereas in our work, this lower wavenumber is assigned to the presence of a flower- NiMoO4 sheet structure between the NiMoO4·xH2O nanorod structure and nickel foam. This was confirmed in our study by performing complementary XRD and Raman spectroscopy studies of flower-NiMoO4 and NiMoO4 nanorods by both selective etching and the additional synthesis of samples with domination of one of the allotropes. We also observe a shift of the peak at 948 cm−1 to slightly lower wavenumbers in their spectra, which, again, is consistent with presence of flower- NiMoO4 sheet structures between the rods and the foam. Interestingly, the anhydrous form of NiMoO4·xH2O, which is also known as α-NiMoO4, shows a much slower leaching rate in 1 M KOH compared with the nanorod-shaped NiMoO4· xH2O.3 Eventually, with 30 wt % KOH or an increased temperature to 51.9 °C in 1 M KOH (as shown in an adjacent study3), molybdenum leaching was achieved for α-NiMoO4. They attributed this to a very limited molybdenum leaching rate that was accelerated by higher concentrated KOH or temperature.2 With the same reasoning and instead considering two different crystal structures, one with more dense/closer packed Ni atoms, it would agree with our detected different molybdenum leaching rates among the different nanostructures, which also possess different crystal structures. This addendum is meant to highlight and acknowledge some recent work we missed in our contribution, with the intention that the additional comments and comparisons made here bring a more complete understanding of the structures and processes present in these systems
From NiMoO4to γ-NiOOH: Detecting the Active Catalyst Phase by Time Resolved in Situ and Operando Raman Spectroscopy
No full textWater electrolysis powered by renewable energies is a promising technology to produce sustainable fossil free fuels. The development and evaluation of effective catalysts are here imperative; however, due to the inclusion of elements with different redox properties and reactivity, these materials undergo dynamical changes and phase transformations during the reaction conditions. NiMoO4 is currently investigated among other metal oxides as a promising noble metal free catalyst for the oxygen evolution reaction. Here we show that at applied bias, NiMoO4·H2O transforms into γ-NiOOH. Time resolved operando Raman spectroscopy is utilized to follow the potential dependent phase transformation and is collaborated with elemental analysis of the electrolyte, confirming that molybdenum leaches out from the as-synthesized NiMoO4·H2O. Molybdenum leaching increases the surface coverage of exposed nickel sites, and this in combination with the formation of γ-NiOOH enlarges the amount of active sites of the catalyst, leading to high current densities. Additionally, we discovered different NiMoO4 nanostructures, nanoflowers, and nanorods, for which the relative ratio can be influenced by the heating ramp during the synthesis. With selective molybdenum etching we were able to assign the varying X-ray diffraction (XRD) pattern as well as Raman vibrations unambiguously to the two nanostructures, which were revealed to exhibit different stabilities in alkaline media by time-resolved in situ and operando Raman spectroscopy. We advocate that a similar approach can beneficially be applied to many other catalysts, unveiling their structural integrity, characterize the dynamic surface reformulation, and resolve any ambiguities in interpretations of the active catalyst phase
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
Author-wise bibliometric analysis based on entropy.
No full textAuthor-wise bibliometric analysis based on entropy.</p
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