1,720,955 research outputs found
Un singolare plume di cloruro di vinile in acquifero confinato: campionamento a basso flusso in sondaggi direct-push e fingerprinting isotopico preliminare.
No full textThe paper deals with an alluvial sandy confined aquifer contaminated by vynil chloride and located in the eastern sector of the Padana plain immediately to the south of the Po river and about 3 km to the north of the city of Ferrara (Northern Italy). Plume investigation followed three steps in temporal succession and with a progressive downscaling: 1) a regional hydrogeological characterization of the aquifer watershed, intended as the whole of the recharge and transmission area of the groundwater reservoir; 2) a hydrochemical survey of existing long-filtered boreholes (wells, piezometers) with a gross definition of the plume; 3) a direct-push drillings based horizontal and vertical characterization of the plume conducted according a dynamic investigation work-plan. The investigated land size has been, respectively, 35, 20 and 6 km2; the plume resulted with a length of 3 km and a maximum width of about 0.5 km. The first step of the investigation, based on the interpretation of collected stratigraphic logs, two piezometric surveys in opposite hydrological conditions and one 3 days pumping test, put in evidence lateral recharge of Po river and the leaky character of the aquifer; the second step, based on 37 boreholes sampling, identified, inside a fully urbanized area, 10 boreholes with VC concentration higher than MAC (3 with values higher than 1000 ppb and one higher than 8000 ppb); the third step, with a total of 15 direct-push drillings down to a maximum of 30 m depth with 3 GW samples for each, put in evidence also the vertical occurrence of the contamination. It has been verified also the effectiveness of GW sampling by a combined use of a inertial pump for collecting the sample preceded by a short term low flow purging by peristaltic pump. The implications for the source definition and plume remediation are also discussed
Caratterizzazione di un plume di cloruro di vinile in un acquifero confinato attraverso perforazioni direct-push, campionamento e spurgo con tecnica low-flow.
No full textThe paper deals with a sandy confined aquifer contaminated by vinyl chloride. Plume investigation followed three steps with a progressive downscaling: 1) a regional hydrogeological characterization; 2) a hydrochemical survey of existing long-filtered boreholes; 3) a direct-push drillings based characterization. The investigation identified, a plume with a length of 1.7 and a width of 0.3 km with VC concentration up to more than 11000 ppb and total absence of other chlorinated compounds. To optimise VC analysis the coupled use of an inertial pump for collecting the sample was verified preceded by a short term low flow purging by peristaltic pump
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
Sediments of shallow lagoonal flats analysed by settling grain size analysis, stream-scanning laser system and settling tube system: can we compare the results?
No full textDispelling 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
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