1,720,959 research outputs found
Valutazione del rischio di contaminazione dei suoli con reti neurali
No full textAttraverso questo lavoro è stata realizzata una metodologia per una rapida ed efficiente valutazione del pericolo di contaminazione del suolo legata alla presenza di discariche incontrollate. In particolare, il criterio adottato ha permesso di confrontare, attraverso un approccio neuro-fuzzy, i risultati ottenuti da un’analisi trasversale di alcune caratteristiche intrinseche delle singole discariche e del territorio dove queste sono ubicate, individuando quali tra queste rappresentano criticità ambientali più rilevanti. Si è classificato, quindi, ciascun sito all’interno di una scala di pericolosità, che consente di stabilire quale tra questi richieda con maggiore urgenza operazioni di controllo, indagini strumentali ed eventualmente risanamento e bonifica. Alla fuzzy neural network è stata affiancata un’analisi di sensitività per poter individuare la funzione di appartenenza che meglio rappresenta i dati di input. In realtà, l’approccio neuro-fuzzy proposto, supportato dall’analisi di sensitività (Caniani et al., 2010), si è rivelato un importante strumento di supporto alle decisioni, al fine di ottimizzare le risorse tecniche ed economiche
Recycling techniques and environmental issues relating to the widening of an high traffic volume italian motorway
No full textRecycling Techniques and Environmental Issues relating to the Widening of an High Traffic Volume Italian Motorway
No full textOn the last few decades, the use of recycled materials has become important because of the limited availability of good aggregates and the difficulties and excessive disposal costs for milled materials. This study provides an environmental evaluation of a specific rehabilitation project involving several recycling techniques on one of the main Italian motorways. Three rehabilitation options are evaluated and compared in terms of their environmental impact, with particular emphasis on the construction of the subbase course. In the end, the definitive design involved different recycling techniques, including cold in-place recycling (CIPR) with bituminous emulsion and cement for the subbase layer, stabilization of the soil with lime for the embankment, the use of reclaimed asphalt in the production of hot mix asphalt, and the use of crushed cement concrete for the cement treated layers. All of these recycling methods allow the saving of the virgin aggregates, and a reduction in materials transportation and pollutant emissions coming from both the production plant and the means of transport
Recycling techniques and environmental issues relating to the widening of an high traffic volume italian motorway
No full textOn the last few decades, the use of recycled materials has become important because of the limited availability of good aggregates and the difficulties and excessive disposal costs for milled materials. In particular, cold in-place recycling (CIPR) has become an attractive alternative to other methods of repairing and upgrading roads. CIPR appears to be the most cost-effective method, and due to innovations relating to the technical equipment, CIPR provides for the production of high-performance materials for the base, subbase and foundation layers. One of the main advantages of CIPR is that the existing damaged road is simultaneously recycled (milled) and mixed with binders in a single-pass operation, enabling a high production rate to be achieved. The binders, which can include cement, cement slurry, lime, bituminous emulsion or foamed bitumen, are injected directly into the recycler mixing chamber while the milling operation is being carried out. This study provides an environmental evaluation of a specific rehabilitation project involving several recycling techniques on the A14 motorway. The A14 motorway is one of the main Italian motorways, and it links Bologna and Taranto over about 750 km. A selected section in the Marche region of about 42 km has been up-graded to a six-lane dual carriageway facility. In this study, three rehabilitation options are evaluated and compared in terms of their environmental impact, with particular emphasis on the construction of the sub-base course. In the end, the definitive design involved different recycling techniques, including CIPR with bituminous emulsion and cement for the subbase layer, stabilization of the soil with lime for the embankment, the use of reclaimed asphalt in the production of hot mix asphalt, and the use of crushed cement concrete for the cement treated layers. All of these recycling methods allow the saving of the virgin aggregates, and a reduction in materials transportation and pollutant emissions coming from both the production plant and the means of transport
Assessment of soil pollution hazard by using fuzzy neural network
No full textA methodology for the rapid and efficient assessment of the hazard of soil contamination due to the presence of uncontrolled landfills was carried out in this study. In particular, by means of a fuzzy neural network, the criterion adopted allowed us to compare the results obtained from a cross analysis of some intrinsic characteristics of the single landfills and the territory where they were located. Their identification shows the most relevant environmental problem. Therefore, we have classified each site within a hazard scale enabling us to understand which one requires to be checked more urgently, to do instrumental surveys and, if needed, to do restoration and reclamation. The fuzzy neural network was combined with a sensitivity analysis to identify the best membership function that represents the input data. The proposed fuzzy neural network, supported by the sensitivity analysis, has revealed to be an important tool for supporting decisions, in order to optimise technical and economic resources
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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