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I costi operativi negli impianti di potabilizzazione
No full textCosts for operation of water treatment plants are discussed and quantifie
Going Beyond Counting First Authors in Author Co-citation Analysis
Get PDFThe 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
Tracer studies at a full-scale lagoon used as pre-treatment facility for a water treatment plant
No full textThe water treatment plant (WTP) of Turin (Italy), fed by water of river, has a lagoon as pre-treatment facility. Since the effectiveness of the lagoon treatment towards the removal of contaminants from water depends on the residence time of the system, and the mixing aspects for the limitation of peak concentration are also very important, this led to an investigation of the internal hydraulics of the lagoon. A tracer study using sodium fluoride (NaF) was performed to determine the stimulus response output and an extensive internal sampling of the tracer was also performed to better understand the movement of the tracer through the system. The lagoon investigated in the study had a surface of 151600 m2, a volume of about 1.8•106 m3 and a nominal residence time of 18 d at average daily flow (1150 L/s). An amount of NaF equal to 180 kg was diluted with about 50000 m3 of the lagoon water and introduced in the lagoon in 12 hours, in order to simulate a pulse injection. The amount of tracer added was fixed in order not to exceed the threshold concentration of 1.5 mg/L (maximum concentration value allowed in drinking water) under the hypothesis that the lagoon was not mixed at all (plug flow modality). Samples were taken from the outlet channel every 45 minutes and analyzed using a fluoride selective probe. The sampling campaign at the outlet channel was stopped after 29 days from the introduction of the tracer, when the outlet concentration dropped under the detection limit of the fluoride selective probe. Samples were also taken at 15 points (over 3 depth values, for a total of 45 sampling points) throughout the lagoon, 1, 7 and 14 days after the tracer introduction. From the interpretation of the tracer response and the tracer distribution in the lagoon in the three days of sampling, it appears that the system was efficiently mixed without relevant short circuits. In fact the first detection of the tracer at the outlet channel occurred after very few hours from the beginning of the test and the mean residence time of the lagoon, determined using the Levenspiel formula, in the presence of the flow rate used for the test, was about 13 days compared with a theoretical hydraulic residence time of 18 days. This assured that dissolved contaminants, like fluoride, from the river were efficiently diluted by the lagoon before entering the WT
Variations on the Author
Get PDF“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
Groundwater nitrate removal: comparison between reverse osmosis and heterotrophic bacterial process
No full textAppropriate Similarity Measures for Author Cocitation Analysis
Get PDFWe 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
I sottoprodotti della disinfezione nella potabilizzazione delle acque superficiali: sviluppo di un modello previsionale
No full textINGEGNERIA AMBIENTAL
Dispelling the Myths Behind First-author Citation Counts
Get PDFWe 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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