1,720,969 research outputs found
Westward moving waves or eddies (Storms) on the Subtropical/Azores Front near 32.5°N? Interpretation of the Eulerian currents and temperature records at moorings 155 (35.5°W) and 156 (34.4°W)
No full textVariability and seasonality of physical and biological fields at the Great Meteor Tablemount (subtropical NE Atlantic)
No full textFive oceanographic surveys were conducted at the Great Meteor Tablemount (subtropical NE Atlantic; 30.0 degreesN, 28.5 degreesW) throughout the 1992-1999 period tc, investigate temporal variability in the relationship between the physical structure of the water column associated with the seamount and phytoplankton biomass and/or production rates. Local increases in chlorophyll a, enhanced carbon incorporation rates and changes in phytoplankton species composition were associated with the seamount. These effects were subjected to a large degree of temporal and spatial variability both at seasonal and shorter time scales.Entre 1992 et 1999 cinq campagnes de recherche océanographique ont été réalisées (30,0ºN, 28,5ºO), pour étudier la variabilité temporelle du rapport entre la structure physique de la colonne dˈeau associée aux abords du mont sous-marin dˈune part, et la biomasse et les taux de production phytoplanctonique dˈautre part. On observe une élévation locale de la teneur en chlorophylle a près du mont sous-marin ainsi que des taux élevés de production primaire et des changements de la composition spécifique du phytoplancton. Ces effets connaissent une variabilité spatiale et temporelle élevée, aussi bien à courte échelle de temps quˈà lˈéchelle saisonnière
A Subtropical Oceanic Ring of Magnitude (STORM) in the eastern North Atlantic: physical, chemical and biological properties
No full textA Subtropical Oceanic Ring of Magnitude (STORM) that budded from the Azores Current was studied in the Eastern North Atlantic Ocean in April 1999. The cyclonic eddy, called Leticia, was centred at ~32.4°N–28.7°W and extended across more than 200 km in an east–west direction. Leticia had been previously detected by means of TOPEX/POSEIDON altimetry data and further intensively investigated using expendable bathythermograph and conductivity–temperature–depth stations. The altimeter surface signature of the eddy revealed a ~20-cm sea-level depression, an upward displacement of the 16°C isotherm of ~125 m was linked to the eddy centre and Geostrophic transport of the amount of water swirling cyclonically was 7 Sv. The temperature, nitrate, and oxygen anomalies on the 0=26.5 isopycnal surface inside Leticia were ?0.4°C, ?1 mol l?1, and +0.3 ml l?1, respectively, with respect to surrounding waters. Shallowing (>50 m) of the deep chlorophyll maximum (>0.3 mg m?3) was observed at the eddy centre associated with vertical displacements of the isotherms (>100 m) within the photic layer. Vertical excursions of the isopycnals and the deep chlorophyll maximum of more than 30 m were observed over temporal scales of a few (3–6) h. Integrated nitrate concentration over the photic layer was ~4-fold higher inside Leticia than outside, however, primary production rates were only slightly higher. Eddy diffusive fluxes across the nitracline, located ~30 m below the deep chlorophyll maximum, ranged from 0.02 to 0.10 mmol NO3 m?2 d?1, and explained <25% of the nitrate required to sustain the estimated new production (0.24–0.48 mmol NO3 m?2 d?1)
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
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