1,721,386 research outputs found
[2.2]-para-cyclophane-4-carbaldehyde as building-block for chiral ligands - Part II: Epoxidation of alkenes catalyzed by the Mn(III)-complex of an atropoisomerically pure (alpha,beta,alpha,beta)-tetraarylporphyrin
No full textThe synthesis of the Mn(III)-complex of the new enantiopure, atropoisomerically pure chiral porphyrin (alpha,beta,alpha,beta)-1 is described. The compound was used as the catalyst in the epoxidation of unfunctionalized olefins using aqueous NaOCl, 30%-H2O2 or PhIO as oxygen donors. Up to 780 overall turnovers were obtained in the presence of NaOCl and PhIO, whereas with 30%-H2O2 only catalase activity was observed. Contrary to expectations based on previous results [S. Banfi, A. Manfredi, F. Montanari, G. Pozzi, S. Quici, J. Mel. Catal., 113 (1996) 77], only racemic epoxides were obtained
Ventura, condottiere et chroniqueur célèbre du XIIIe siècle, était pharmacien : C. Madino et C. G. Pozzi, Minerva farmaceutica, 1955
No full textGuitard Eugène-Humbert. Ventura, condottiere et chroniqueur célèbre du XIIIe siècle, était pharmacien : C. Madino et C. G. Pozzi, Minerva farmaceutica, 1955. In: Revue d'histoire de la pharmacie, 44ᵉ année, n°150, 1956. p. 410
A database schema for public-domain medical software
No full textThe quantity of public-domain medical software available is huge, and a classification schema may be therefore helpful. We developed a schema that includes identification data (name of the software, author, etc.), description (hardware and software requirements), classification (software category, application domain, etc.) and evaluation data (external quality and internal quality factors). The schema was tested on the public-domain software available at the SCAMC meetings (about 36 Mb). We also classified the software by employing students from a master course in computer science and medical informatics. We stored the high quantity of information collected in a database we developed using Paradox
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
Observations of electrostatic field by electron holography: the case of reverse-biased p-n junctions
No full textThe technique of electron holography is applied to the investigation of microelectric fields such as those associated with reverse-biased p-n junctions. Suitable electron-optical conditions were adopted in order to minimize the effect of the electrostatic fringing field on the reference wave. The electron holograms were optically processed by the method of differential interferometry
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