1,721,029 research outputs found
Economic Policies and Urban Development in Latin America
No full textMichele Alacevich and Andrea Costa examine the strong interrelations between urban planning and economic planning that developed in the early 1950s in Latin America, where arguably the multifaceted programming effort of the post-Second World War era gained its greater momentum. The plan was considered the main tool, common to economic as well as to urban policies, while equilibrium was the principal concept which framed the elaboration and the implementation of any development plan. Alacevich and Costa pay particular attention to the case of Colombia, visited by some of the most illustrious modernist architects such as Le Corbusier and José Luis Sert, who were attracted by the chance to realize urban plans at a scope that had simply not been possible in Europe. The result was a particularly close symbiosis between economic and urban planning
Chiral discrimination on the host-guest complexation of resorc[4]arenes with quarternary amines
No full textMehdizadeh A, Letzel M, Klaes M, Agena C, Mattay J. Chiral discrimination on the host-guest complexation of resorc[4]arenes with quarternary amines. EUROPEAN JOURNAL OF MASS SPECTROMETRY. 2004;10(1):649-655.The interaction of inherently chiral resorc[4]arenes with different chiral ammonium ions was measured by electrospray ionization mass spectrometry. For this purpose, one enantiomer of the ammonium guests was labeled with deuterium to distinguish the enantiomers by their mass. We synthesized the ammonium salts by the reaction of chiral primary amines with either CH3I or CD3I and analyzed the resulting ammonium iodides by nuclear magnetic resonance and optical rotation. The complexation experiments were performed by mixing the chiral host with various ratios of the unlabeled guest and its labeled enantiomer. By analyzing the integrals of the host-guest complexes, we observed a chiral discrimination effect and a secondary isotope effect as well
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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