1,721,015 research outputs found
Il recupero dei beni storici e monumentali: un caso di studio
No full textNel presente lavoro sarà presentato l’adeguamento normativo e funzionale del Padiglione dei Servizi Amministrativi del Policlinico di Bari, un edificio monumentale che rappresenta l’ingresso al nosocomio barese. L’occasione è lo spunto per una riflessione sul recupero degli edifici storici e monumentali alla luce dei problemi derivanti dall’applicazione delle nuove normative tecniche con particolare riferimento al campo sismico ed energetico.This paper presents the normative and functional upgrading of the pavilion for the Administrative Departments of the Policlinico di Bari, a monumental building, which serves as the main entrance to the hospital in Bari. This opportunity is the starting point for a thorough discussion on the recovery of historical and monumental buildings in the light of problems arising from new technical regulations with particular reference to the seismic and energy fields
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
“Oxidation of Natural Targets by Dioxiranes. 6.On the Direct Regio- and Siteselective Oxyfunctionalization of Estrone and of 5α-Androstane Steroid Derivatives.”
No full textUsing methyl(trifluoromethyl)dioxirane (1b), 3b,6a,17b-triacetoxy-5a-androstane (6) could be selectively
transformed into its C-14 hydroxy derivative (7) and into the valuable C-12 ketone steroid (8),
in high yields under mild reaction conditions. Similarly, the oxidation of 3a-estrone acetate (4) with
1b was carried out to yield selectively the steroid C-9 hydroxy derivative (5). The high regio- and siteselectivity
attained demonstrates that the powerful dioxirane 1b is the reagent of choice to synthesize
valuable oxyfunctionalized steroid derivatives
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
Oxidation of natural targets by dioxiranes. 2. Direct oxidation at the side chain C-25 of cholestane derivatives and of vitamin D3 Windaus-Grundmann ketone
No full text
Selective oxidation of acetylenic 1,4-diols with dioxiranes in comparison with the methyltrioxorhenium-hydrogen peroxide oxidant
No full textDimethyldioxirane (DMD) and its trifluoro analog (TFD) were employed to achieve selectively the direct transformation of diol 3a and of diol 3b into the corresponding carbonyls. The results are compared with oxidations using methyltrioxorhenium (MTO)/85% H2O2. Dimethyldioxirane (1a) and its trifluoro analog (1b) were employed to achieve selectively the direct transformation of hex-3-yne-2,5-diol 3a and 1,4-diphenyl-but-2yne-1,4-diol 3b (two representative acetylenic 1,4-diols) into the corresponding carbonyls, leaving the carbon-carbon triple bond moiety untouched. The results are compared with those recorded in the analogous oxidation using the methyltrioxorhenium (MTO)/85% H2O2 homogeneous system. The powerful methyl(trifluoromethyl)dioxirane (1b) is the reagent of choice to achieve optimum yields of the target alkyne-1,4-diones, which are extremely versatile synthons. © 2004 Elsevier Ltd. All rights reserved
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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