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Tb<sub>2</sub>O@<i>C</i><sub>2</sub>(13333)‑C<sub>74</sub>: A Non-Isolated Pentagon Endohedral Fullerene Containing a Nearly Linear Tb–O–Tb Unit
No full textTerbium has been added to the list of elements that form
oxide
clusters inside fullerene cages. Tb2O@C2(13333)-C74 has been isolated as a byproduct
of the electric arc synthesis of the azafullerene Tb2@C79N. Cocrystallization of Tb2O@C2(13333)-C74 with Ni(OEP) (where OEP is the
dianion of octaethylporphyrin) in toluene yielded black needles of
Tb2O@C2(13333)-C74·NiII(OEP)·1.5C7H8 that
have been examined by single-crystal X-ray diffraction. The resulting
structure shows that a nearly linear Tb–O–Tb unit is
contained in a C2(13333)-C74, which has two sites where pentagons share an edge to form pentalene
units at opposite ends of the fullerene. Unlike the usual situations
where metal atoms in fullerenes that do not obey the isolated pentagon
rule are situated within the folds of the pentalene units, the Tb
atoms in Tb2O@C2(13333)-C74 are positioned to the side of the pentalene units and near-neighboring
hexagons. The magnetic properties of Tb2O@C2(13333)-C74 have been examined starting from
the experimental geometry, using ab-initio multiconfigurational methods.
The computations predict that Tb2O@C2(13333)-C74 will show strong axiality, which would
make it a single-molecule magnet with a large magnetic anisotropy
barrier
Sonograms from 12/07/2016 to 20/07/2016 Panshanger Park TL 28796 13333
No full textResults from deployment of SM2 at Panshanger Park at location TL 28796 13333 at ride junction in woodland between Great Oak and Stables. Deployed from 12/07/2016 until 20/07/201
Going Beyond Counting First Authors in Author Co-citation Analysis
Get PDFThe 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
Get PDF“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
Get PDFWe 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
Get PDFWe 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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