1,720,959 research outputs found
Release of pollutants from hydrated mixtures of cement and fly ash with a high sulphate and chloride content
No full textMixtures of cement and fly ash from Municipal Solid Waste (MSW), with a high content of sulphate and chloride as well as a large concentration of heavy metals, were appropriately hydrated. In the leaching test using deionised water, these mixtures showed an efficient interaction of the sulphate with the cementitious matrix. The behaviour of chloride release from pastes hardened has shown that an acceleration of the hydration process takes place. This acceleration was particularly intense for the mixtures with an intermediate fly ash content. The release of polluting elements as Cu, Zn, Cd, Pb, Cr(VI) from the solidified mixtures was correlated to the degree of stabilisation of the fly ash
Behaviour towards leaching of fly ash from a municipal solid waste incineration plant
No full textAn examination was made of the behaviour towards leaching of fly ash produced by a municipal solid waste incineration plant. The release of heavy metals and chloride and sulphate ions was evaluated by means of leaching solutions of different pH values. The chemical composition and mineralogical characteristics of fly ash leached with water was compared with those of the same fly ash untreated. It was found that the water-fly ash interaction causes a marked reduction in the more soluble salts and the formation of some hydrate products in the fly ash. The leaching test at pH 5.0 with 0.5 M acetic acid applied to fly ash solidified with pozzolanic cement revealed a good degree of stabilization achieved
Malte idrauliche per il restauro di strutture murarie di opere di interesse storico-architettonico
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Ingegneria del controllo di sotto-sistemi ambientali per grandi infrastrutture di trasporto: l’aeroporto di Milano Malpensa
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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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