1,720,960 research outputs found
Composition of black crust in different sites in Europe – estimation using statistical methods.
No full textThe characterization of the damage layer formed on monuments is very important to provide detailed information on its composition and to understand whether the element originates from the substrate or from atmospheric deposition (anthropogenic origin). To understand the different types of damage on cultural heritage, six different European sites were considered. The complete characterization of damage layer, including the elemental composition carried out by coupled plasma-optical emission spectrometer (ICP-OES), was performed. The results achieved will be discussed with the aim of formulating valid hypotheses on the major stationary and mobile combustion sources responsible for the damage at each site
IMPATTO DELL’INQUINAMENTO ATMOSFERICO ED ALTERAZIONI CROMATICHE DELLE SUPERFICI ARCHITETTONICHE NEL TEMPO: SANTA MARIA DEL FIORE, FIRENZE.
No full textIl presente lavoro si propone di contribuire allo studio dell’interazione tra beni culturali e ambiente, in particolare inquinamento atmosferico, prendendo in considerazione la Cattedrale di Santa Maria del Fiore a Firenze. A tale scopo sono stati effettuati dei campionamenti di strati di degrado sui tre tipi di materiale lapideo presenti, successivamente analizzati attraverso una serie di procedure analitiche finalizzate all’identificazione chimico-mineralogica dei componenti. Allo scopo di evidenziare una correlazione tra il cambiamento cromatico che interessa le superfici dei monumenti e gli inquinanti emessi dai processi di combustione, un ulteriore studio è stato realizzato mediante misure colorimetriche successivamente relazionate ai dati analitici ottenuti. Per valutare l’impatto che l’annerimento delle superfici architettoniche del monumento oggetto di studio svolge sulla percezione visiva ed ipotizzare quale potrebbe essere la distribuzione degli strati di degrado in futuro, sono state realizzare delle carte di degrado utilizzando una indagine fotografica ed una ricerca storica di fotografie riproducenti la facciata considerata. I risultati ottenuti consentono di ipotizzare future patine di degrado meno diffuse, di colore tendente al giallo-bruno, dovuto alla crescita della componente organica del particolato
Seismic risk assessment for masonry buildings typologies from L’Aquila 2009 earthquake damage data
No full textIn this study a seismic risk analysis of masonry buildings based on damage data of L’Aquila 2009 earthquake is presented. Typological loss curves and Expected Annualized Losses (EAL) values are presented, starting from the data collected into AeDES forms available in the Da.D.O. database. A completion is proposed for improving the sample statistical significance, and correctly including undamaged and not surveyed buildings that suffered low shaking values. Finally, the loss curves proposed permits to economically assess the effectiveness of some local and very frequent interventions (such as chains/ring beams), and their consequent impact in seismic risk mitigation
Fragility Curves and Economic Loss Assessment of RC Buildings after L’Aquila 2009 Earthquake
No full textA buildings stock of 12,016 Reinforced Concrete (RC) buildings is investigated to propose vulnerability, fragility, and loss curves, as well as an Expected Annual Loss (EAL) assessment. The buildings data are collected within Da.D.O. database, considering the observed damage due to L’Aquila earthquake (2009). The adopted methodology allows us to add undamaged and not-surveyed buildings, not included within the database, by considering the typological distribution of two different reference municipalities. The obtained results highlight that the completed database allows a more reliable seismic risk assessment, even if resulting EAL is poorly influenced by reference municipality assumed for undamaged buildings estimation
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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