1,721,186 research outputs found
G. Bassi. Siège et qualité de l'image ophtalmoscopique
No full textVan Biervliet J.-J. G. Bassi. Siège et qualité de l'image ophtalmoscopique. In: L'année psychologique. 1898 vol. 5. pp. 601-602
Maurizio Ridolfi, Patrizia Gabrielli, e Enzo Fimiani (a cura di), L’Italia repubblicana. Costruzione, consolidamento, trasformazioni, vol 1, Il primo ventennio democratico (1946–1966), Roma, Viella, 2020, 180 pp.
Full text linkVeniamo da lontano, andiamo lontano : Gli studi nel centenario della fondazione del Partito Comunista Italiano
No full textThe Italian Communist Party’s 100th Anniversary was the opportunity for a large number of diversified cultural initiatives: documentaries, exhibitions, reviews, public debates, cultural meetings, scientific conferences, and a wide range of publications. Actually, the coincidence with other anniversaries linked to the most important communist leaders, such as Antonio Gramsci, Palmiro Togliatti, Enrico Berlinguer, or Nilde Iotti, multiplied the publication of books on the ICP for five years (2018-2023). The essay aims at analysing such a relevant historiographic production mostly focused on local reconstructions and political biographies, including communist women. Few, but valuable, were the histories that have retraced the entire historical path of the party or some special turning point of the communist experience. Unlike the previous historiographical seasons, this element derives, on one hand, from a progressive tendency towards the fragmentation of studies, and, on the other, from the gradual marginalisation of the historiographical and politological interest in twentieth-century mass parties. However, this has also allowed, for the first time compared to past historiographical seasons, a strong (and hopefully long) split between the analytical level and the political one
Model representation of the zirconia interface : Effects of the temperature of the oxide preparation
No full textThe interfacial properties of samples of monoclinic zirconia, obtained at different temperatures, are analyzed and interpreted through the model of Davis, James and Leckie (J. Colloid Interface Sci.,63, 480 (1978); 67, 90 (1978); 74, 32 (1980)). The temperature of the oxide preparation appears to affect deeply the features of the surface: different mechanisms of development of charge are operative at low and at high temperatures and the densities of sites, around the p.z.c., are respectively small and large in the two cases. These latter conditions, in their turn, bear consequences to the possibility to apply graphical procedures for the determination of model parameters. These results are discussed and critically compared with previous data from the literature. © 1990
Components of the measured surface charge of low temperature ceramic oxides
No full textThis paper contains an analysis of the interfacial behaviour of samples of monoclinic zirconia. The oxide powder was obtained by calcining a hydrothermal precursor at 200° C. Results of surface charge determinations are elaborated to yield total capacitance values which, in turn, are analyzed on the basis of Parsons and Zobel (P-Z) plots (R. Parsons and F.G.R. Zobel, J. Electroanal. Chem., 9 (1965) 333). The aptitude of selecting either a planar or a spherical geometry for the diffuse double layer is discussed. Analysis of the results in P-Z coordinates indicates that samples subjected to the "routine" overnight conditioning in the solution present only effects due to simple diffuse double layer charge compensation. In the case, instead, of samples conditioned for a longer time (143 h), different components of the surface charge become apparent. Phenomena related to bulk penetration of the base electrolyte are suggested to occur in the latter case. © 1991
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
Preparation of crystalline zirconia powders. Characterization of the bulk phase and interfacial behaviour
No full textCalcinations, in oxygen, of ZrCl4, and Zr(OH)4, prepared hydrothermally, have been performed over a wide temperature range (200-850°C). The product of the reaction was (except for the 850°C sample) a phase mixture composed, at lower temperatures, of the stable monoclinic and the metastable cubic and tetragonal forms and, at higher temperatures, of the monoclinic and tetragonal polymorphs. Subjecting the powders to a severe mechanical grinding resulted, at any temperature, in the transformation of the phase mixture into a pure monoclinic phase. Some of the controversial aspects both of occurrence and of "stabilization" at low temperatures of ZrO2 polymorphs are discussed. Results concerning the dependence on the temperature of preparation and the features of the pure monoclinic phases (crystallites sizes, surface area, porosity) are presented. The paper also reports surface charge versus pH curves obtained on suspensions of the powders in KNO3. The effects induced by the temperature of preparation on the surface electrification behaviour are discussed. © 1990
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