1,720,996 research outputs found
Mappare la vulnerabilità sismica degli edifici nella Regione Marche; un modello empirico di previsione basato su GIS
No full textIl patrimonio edilizio italiano è caratterizzato da una grande vulnerabilità sismica, originata da diversi fattori, fra cui la modesta qualità costruttiva di molti edifici nelle aree rurali e piccoli centri urbani e la vetustà di numerosissime altre costruzioni che, sebbene di gran pregio architettonico, non sono adeguatamente tutelate dai terremoti. Giocano poi un ruolo importante anche le trascuratezze nell’edificato contemporaneo e la scarsa qualità delle costruzioni pubbliche, fra cui le scuole, che al contrario dovrebbero essere rigorosamente monitorate e messe in sicurezza. Infine, anche l’ubicazione di costruzioni in siti inadatti gioca un ruolo importante nel definire il grado di vulnerabilità sismica delle abitazioni. Spesso l’edificato è ubicato in siti già dissestati da frane, che vengono poi riattivate dai terremoti. Questa preesistente ed elevata vulnerabilità sismica dell’edificato continua a causare disastri sismici in Italia, anche negli ultimi decenni, quando tecniche di costruzioni più moderne hanno sensibilmente migliorato la risposta sismica dei nuovi edifici. Il presente studio, utilizando una metodologia GIS, sviluppa un modello empirico che confronta e integra i dati relativi ai danni strutturali raccolti dopo il terremoto Marche-Umbria del 1997 con magnitudo momento (Mw) 6,1 ed epicentro a Colfiorito nel comune di Foligno, con i dati sulle condizioni dell’edificato nella regione Marche raccolti durante il censimento dell’Istituto Nazionale di Statistica condotto nel 2001
A rapid method for flood susceptibility mapping in two districts of Phatthalung Province (Thailand): present and projected conditions for 2050
No full textThis study discusses the application of a multiple logistic regression analysis in Khao Chai Son and Mueang Phatthalung districts (Phatthalung Province in southern Thailand), which were the two worst flooded districts in the 2011 inundation. The aim is to test an easy, rapid, and cost-effective method to asses flood susceptibility in a data-poor country. Climatic, topographic, and geological data have been overlaid with those of the flood events occurred in the study area from 2007 to 2011. Results showed a positive spatial correlation between the northeast monsoon precipitation and flooding. Moreover, using the rainfall projection of the U.S. National Center for Atmospheric Research the proposed model forecasts a sharp increase of flood susceptibility in the study area by the year 2050. Given the versatility of such model, local governments could easily use it to define the areas in their territories most exposed to flood hazard and timely implement risk reduction policies and practices
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
Innovative monitoring tools to define Good Environmental Status of Coralligenous habitats
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