1,720,966 research outputs found
Water masses and nutrient distribution in the Gulf of Syrte and between Sicily and Libya
No full textThis paper analyzes for the first time the water masses circulation in the Gulf of Syrte (Libya) and along a Sicily-Libya transect (central Mediterranean Sea) based on a new dataset of hydrological and nutrients data. The collected dataset highlights the presence of three main water masses with different chemical-physical features: Atlantic Water, Levantine Intermediate Water and Deep Water. Atlantic Water shows an intrusive low-salinity water near the Sicilian (≤. 37.6) and Libyan coasts (≤. 37.8), linked to the Atlantic Ionian Stream and the Atlantic Libyan Current respectively. The surface circulation evidences meandering structures throughout the area and the presence of an anti-cyclonic vortex in the central part of the Gulf of Syrte. In this latter area no coastal surface current is recognized, suggesting a seasonal character for such coastal circulation. In the Gulf the anti-cyclonic pattern characterizes also the intermediate water circulation. The nutrient distribution confirms the oligotrophic character of the area with a strong reduction in concentration in the surface layer due to the assimilation of phytoplankton in the euphotic zone. Furthermore, there is an evident increase in the deep water caused by the re-mineralization of organisms. The nitrate:phosphate ratio is ~. 10 and ~. 30 in the surface waters and deep waters, respectively, the latter being far in excess of the Redfield ratio (16:1) found in the oceans' deep waters. Nutrients data close to the Libyan coast do not show any enrichment pattern as a potential effect of the input of Saharan dust. © 2013 Elsevier B.V
ENEA internal best practices for seawater total suspended solids measurement: experimental assessment of measurement uncertainty and correlation with turbidity. Test case in a near shore area (Ligurian Sea, La Spezia Gulf)
Get PDFTotal Suspended Solids (TSS) is considered a very important oceanographic quantity to describe the status of the seawater column. The ENEA Marine Environment Research Centre of S. Teresa, devoted since the ‘70s to the monitoring, analysis and comprehension of physical, chemical and biological processes in marine environment, has therefore developed an historical experience also in TSS measurement. Aim of the present work is to collect ENEA expertise and internal procedure related to experimental TSS measurement, formalizing in particular the assessment of TSS measurement uncertainty in accordance with reference guidelines and standards. The contribution of mass and volume in the laboratory-based gravimetric method to measure TSS (by filtering process) has been analysed, together with the effect due to repeatability proper of this type of experimental activity. TSS combined standard uncertainty has been finally evaluated, and just the repeatability contribution proved to be the most relevant one (about 10 % in terms of relative standard uncertainty). The link between TSS and Turbidity, continuously optically measured along the water column, is also discussed. Turbidity of a water sample can in fact be used to infer the mass of particles in suspension by means of a sort of a calibration curve that relates TSS to Turbidity itself. This relation can be reasonably approximated by a linear model, whose slope is sample-dependent: consequently, the conversion from a Turbidity profile to a TSS one has to be determined each time. Results prove that this consolidated approach can be applied in the near-shore area, where ENEA performs its monitoring campaigns. The present technical report is intended to serve as a basis for developing procedures more and more compliant to international metrological standards, with the aim of further guaranteeing the metrological traceability of oceanographic quantities
Determinazione del tasso di crescita dell'alga Corallina Elongata in ambiente controllato e in ambiente naturale tramite l'utilizzo dei marcatori Alizarin (red) e Calcofluor White
No full text
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
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
Appropriate 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
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
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
- …
