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Evaluation of the /sup 175/Lu(n,2n)/sup 174/Lu, /sup 175/Lu(n,2n/sup 174m/Lu, and /sup 175/Lu(n,3n)/sup 173/Lu cross sections from threshold to 20 MeV. [Q valves, thesholds]
No full textAn evaluation of the /sup 175/Lu(n,2n)/sup 174/Lu, /sup 175/Lu(n,2n)/sup 174m/Lu, and /sup 175/Lu(n,3n)/sup 173/Lu reactions from threshold to 20 MeV is presented. Available experimental data were renormalized to a consistent set of standards and were used along with results from statistical-preequilibrium model calculations to produce recommended curves for each of these reactions
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
Investigations of pressurized Lu-N-H materials by using the hybrid functional
Full text linkRecently, Lu-N-H materials were reported to have room-temperature
superconductivity, and the Hubbard U correction on the Lu's
-electrons is necessary, and a constant U = 5.5 eV was applied to
different Lu-N-H configurations (Nature 615, 244 (2023)). Following simulations
indicate that the superconducting transition temperature (T) of LuH
with U = 0 eV is 50 ~ 60 K, while the N-doped LuH is below 30 K. Quite
recently, calculations with U = 5 eV shows that the T of N-doped
LuH exceeds 100 K. The properties of Lu-N-H are sensitive to the applied
U values. Here, the structural and electronic Lu-N-H properties at
high-pressure (0 ~ 10 GPa) are systematically investigated based on the hybrid
functional. We show that different Lu-N-H configurations should possess
different U values varying from 6.4 eV to 7.4 eV. Furthermore, at pressure
ranging from 0 GPa to 1 GPa, the and band centers of
N-doped LuH show oscillation or even plateau, and the band gap of
insulators also shows a platform near this pressure, this is consistent with
the pressure range where room-temperature superconductivity appeared in Lu-N-H.
Our work provides insights into the understanding of Lu-N-H materials and other
hydrogen-rich superconductors based on the rare-earth elements
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
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Search for ambient superconductivity in the Lu–N–H system
No full textMotivated by the recent report of room-temperature superconductivity at near-ambient pressure in N-doped lutetium hydride, we performed a comprehensive, detailed study of the phase diagram of the Lu–N–H system, looking for superconducting phases. We combined ab initio crystal structure prediction with ephemeral data- derived interatomic potentials to sample over 200,000 different structures. Out of the more than 150 structures predicted to be metastable within ∼ 50 meV from the convex hull we identify 52 viable candidates for con- ventional superconductivity, for which we computed their superconducting properties from Density Functional Perturbation Theory. Although for some of these structures we do predict a finite superconducting Tc, none is even remotely compatible with room-temperature superconductivity as reported by Dasenbrock et al. Our work joins the broader community effort that has followed the report of near-ambient superconductivity, confirming beyond reasonable doubt that no conventional mechanism can explain the reported Tc in Lu–N–H
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