1,720,961 research outputs found
Quantitative assessment of the risk associated to the transport of hazardous substances by pipeline
No full textThe transport of hazardous substances by pipeline has a high social acceptability and is widely diffused. However, several accidents resulting in fatalities and in severe environmental contamination are reported in the literature. Conventional quantitative risk assessment (QRA) techniques are widely applied to pipeline safety analysis, but these methods seldom take into account the environmental consequences of accidental events.
In the present study a specific methodology and a software tool, TRAT-GIS 4.1, were applied to the analysis of the risk to people and environment due to pipeline transport of hazardous substances. Well known individual and societal risk plots were obtained for loss of containment of flammable and toxic substances. On the other hand, the methodology provides as well the extension of potential contaminated areas and overall cost figures expressing the severity of the expected environmental damage associated to the spill of substances dangerous for the environment. The methodology and the software were applied to several case-studies, and the results were compared to those provided by conventional methods. The analysis of the case-studies evidenced the potentiality of the method as a possible tool for decision support, in particular in the case of pipeline hazmat transport though areas where an important environmental heritage is present
Il trasporto in condotta: valutazione del rischio per l’uomo e per l’ambiente
No full textIl trasporto in condotta rappresenta la modalità di movimentazione via terra più sicura per il trasferimento di fluidi pericolosi tra due stabilimenti. Se questo è confermato dalle basse frequenze incidentali che caratterizzano le condotte, occorre tuttavia tenere presente che i quantitativi di sostanze che possono essere rilasciate da questi impianti possono essere molto elevati, anche in presenza di sezionamenti intermedi. Questa considerazione giustifica la necessità di quantificare il rischio generato dalle condotte sia per la popolazione che per l’ambiente, con particolare riferimento agli effetti negativi provocati sul suolo ed eventualmente sulla falda acquifera dai rilasci di liquidi. In questo studio viene presentata una metodologia innovativa, implementata utilizzando uno specifico strumento software, per l’analisi quantificata del rischio per l’uomo e per l’ambiente derivante dal trasporto in condotta di sostanze pericolose. La metodologia individuata è stata applicata ad un caso di studio derivato da una situazione reale del contesto nazionale, relativa ad una condotta di collegamento tra un pozzo di estrazione di petrolio e il vicino impianto di trattamento del greggio. I risultati ottenuti hanno confermato la potenzialità e l’utilità della procedura ai fini di un’analisi del rischio complessivo generato dalle condotte, dei cui risultati si possa tenere conto in modo esteso nelle sedi in cui la valutazione di rischio di un impianto si interfaccia con le attività di pianificazione territoriale
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
koamabayili/VECTRON-author-checklist: VECTRON author checklist
No full textWe have done our best to complete the author checklist relating to the use of animals in the hut study. Note that the objective for the hut study was to evaluate the IRS treatment applications for residual efficacy against Anopheles mosquitoes, including the local An. coluzzii mosquito population. Cows were only used to attract mosquitoes into the huts and no tests were carried out directly on the cows. The author checklist is intended for use with studies where experiments are carried out on animals, which is why we have had such difficulty in completing this for the hut study, as many of the questions do not relate to how the cows were used
Author-wise bibliometric analysis based on entropy.
No full textAuthor-wise bibliometric analysis based on entropy.</p
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