1,720,962 research outputs found
Hydrophobic Admixtures to Control Corrosion of Galvanized Steel Reinforcement in Concrete
No full textUse of fluidized bed combustion wastes for the synthesis of low- energy cements
No full textAmong the low-energy binders, calcium sulphoaluminate cements are worthy of consideration also because a wide range of industrial solid wastes can be utilized in their manufacture. In this paper, it has been proposed the use of mixtures composed by fluidized bed combustion wastes as raw materials for the synthesis of calcium sulphoaluminate cements. Several systems based on two fluidized bed combustion-derived wastes (a sulpho-calcic fly ash and a silico-aluminous fly ash) and a solid waste generated within a traditional coal-fired power plant were heated in a laboratory electric oven for 2 hours at temperatures ranging from 1050°C to 1300°C. Calcium sulphoaluminate was often obtained and its formation was related to the waste nature and the burning temperature
Characterization of sulphation and of hydration-induced reactivation of sorbents in fluidized bed systems (F. Montagnaro's PhD Thesis)
No full text
Cementi speciali innovative a ridotto impatto ambientale
No full textSorbenti esausti, ricchi in ossido di calcio, provenienti da processi di cattura della CO2 mediante la tecnica del “calcium looping” (CaL) condotta all’interno di reattori a letto fluidizzato (reattori FBC), (B) fanghi derivanti da processi di ossidazione anodica di elementi in alluminio, (C) gessi chimici da desolforazione di fumi di combustione e (D) residui della combustione del carbone all’interno di reattori FBC possono utilmente sostituire, in tutto o in parte, calcare, bauxite e gesso naturale all’interno di miscele crude per la sintesi di cementi a base di solfoalluminato calcio (cementi CSA). In questo modo, le già riconosciute caratteristiche eco-sostenibili derivanti dal processo di produzione dei cementi CSA possono essere ulteriormente esaltate sia dall’impiego di rifiuti e sottoprodotti di origine industriale sia da un’ulteriore riduzione di CO2 derivante dall’utilizzo di sorbenti da CaL (fonti non carbonatate di ossido di calcio).
Nelle condizioni di sintesi adottate si sono ottenute conversione e selettività elevate verso i componenti idraulici desiderati, più elevate per le miscele a base di rifiuti rispetto a quella costituita da sole materie prime naturali. Inoltre tutti i cementi CSA, ottenuti a partire dai clinker prodotti alle temperature ottimali di sintesi, hanno esibito un simile comportamento all’idratazione
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
Dispelling the Myths Behind First-author Citation Counts
Full text linkWe conducted a full-scale evaluative citation analysis study of scholars in the XML research field to explore just how different from each other author rankings resulting from different citation counting methods actually are, and to demonstrate the capability of emerging data and tools on the Web in supporting more realistic citation counting methods. Our results contest some common arguments for the continued
use of first-author citation counts in the evaluation of scholars, such as high correlations between author rankings by first-author citation counts and other citation
counting methods, and high costs of using more realistic citation counting methods that are not well-supported by the ISI databases. It is argued that increasingly available digital full text research papers make it possible for citation analysis studies to go beyond what the ISI databases have directly supported and to employ more
sophisticated methods
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