1,721,057 research outputs found
A high temperature in situ single-crystal study of P4/n vesuvianite RID B-5536-2008
No full textSingle crystal X-ray diffraction data were collected at T = 570, 770, 1070 K on a sample of a P4/n vesuvianite from Val d'Ala (Piedmont, Italy). Structure refinements yielded R values of 6.7, 6.8 and 8.5% for the three temperatures, respectively; the P4/n symmetry was retained throughout. The volume thermal expansion coefficient was 33.7(7) . 10(-6) K-1; different expansion rates were observed along the a and c directions [10.4(3) . 10(-6) K-1 and 12.9(3) . 10(-6) K-1 respectively]. The volume expansion is larger than that observed in the structurally similar garnet, due to a higher expansion rate along the c axis. An analysis of the atomic displacement parameters (ADP's) with temperature performed on Ca(2) and Ca(3) atoms did not indicate significant positional disorder. As well no evidence of changes in the cation distribution was found in the Ca(4)a and b and M(2)a and b sites even after prolonged heating at 1070 K
La piazza e la valle. Il complesso scolastico a Monteleone di Puglia: luogo pubblico e affaccio sul paesaggio circostante
No full text
Effetto delle Condizioni Operative nella Modifica di Bitumi con Elastomeri Termoplastici SBS
No full textAb initio calculation at DFT level of NaGaSi2O6 and LiAlSi2O6 pyroxenes: a comparison from the Bader's topology viewpoint
No full text[Megacolon in a case of Steinert's myotonic dystrophy].
No full textA case of Dystrophia Myotonica with a positive family history, cataract and myotonic bursts on EMG is reported. The patient underwent repeated respiratory infections, which were associated with an abnormal elevation of the diaphragm and with an enlargement of the colon. The frequency of pulmonary infections, which may arise many years before the appearance of neurological symptoms, is stressed. On the other hand enlargement of the colon is a rare finding. Its pathogenesis as well as therapeutic implications are discussed
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
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