1,720,962 research outputs found
Second-order segmentation; the relationship between volcanism and tectonism at the MAR, 38N-35 40N
No full textDeep-tow sidescan sonar data acquired along 240 km of the Mid-Atlantic Ridge (MAR) between 35°40?N and 38°N have been combined with new bathymetric compilations and used to establish the recent tectonic and volcanic history of six second-order segments and their bounding non-transform offsets (NTOs). The segments show a range of volcanic and tectonic types, but in general the northernmost segments (i.e. those with greater influence from the Azorean hotspot) are shallower and more volcanically robust than those to the south, with hydrothermal activity in segment centres (for example, Menez Gwen and Lucky Strike). Nonetheless, this generalisation requires some modification due to temporal variations in the balance between magmatic supply and tectonic dismemberment. The NTOs are broad right-stepping discontinuities, locally up to 25 km wide, and accommodate offsets between 10 and 50 km. The discontinuities are mostly sediment-floored, and link the spreading segment tips with a range of structures. These include locally dense arrays of en echelon extensional normal faults, short lengths of linear strike–slip fault strands occasionally cutting basement blocks apparently stranded within the offsets. Basement blocks within the offsets are cross-cut by complexes of intersecting faults, suggesting that deformation is distributed across the zone. The pervasive faulting taking place at the NTOs favours fluid circulation and associated hydrothermal activity, as at the Rainbow Site at 36°17?N
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
Impatto ambientale e sussistenza delle troticolture di montagna nel Trentino
No full textNel Trentino, l’abbondante presenza di acque tipiche della “Zona della Trota” ha favorito il diffondersi della troticoltura fin dal XIX
secolo. La continua ricerca di miglioramento nelle attività agricole integrative anche su terreni marginali, ha portato alla realizzazione di molti piccoli impianti per l’allevamento dei salmonidi, costruiti all’inizio in terra battuta e poi in calcestruzzo per resistere all’erosione dei
corsi d’acqua circostanti, e per aumentarne il carico e facilitarne la gestione, quasi sempre familiare. Su 53 impianti oggetto di indagini recenti, 30 hanno una superficie delle vasche inferiore a 3.000 m2. Solo 5 superano i 10.000 m2. I troticoltori hanno bilanciato il limite alla produzione rappresentato dalle acque fredde (nel Trentino occorrono 15-20 mesi per aggiungere la taglia commerciale, contro gli 11-13 della pianura) col vantaggio di ottenerere trote con carni più compatte, pagate di più al conferimento. Alla minor produzione consentita da un ambiente severo corrisponde un impatto ambientale più contenuto, oggi richiesto dalla Grande Distribuzione Organizzata (GDO) con il riconoscimento di maggiore remunerazione, alle seguenti condizioni: - il valore dell’Indice Biotico Esteso (IBE) dell’ambiente acquatico a monte della pescicoltura deve essere non inferiore a 10 (1a Classe di Qualità Biologica), mentre quello dell’ambiente a valle deve essere non inferiore a 8 (2a Classe); - è vietato l’uso di ossigenatori elettromeccanici e/o l’iniezione di ossigeno liquido con la finalità di aumentare la densità di allevamento; - la densità di allevamento non deve mai superare i 20 kg/m3. In questo lavoro sono state prese in esame sei troticolture. A monte ed a valle di ciascuna, per un periodo di tre anni, sono stati rilevati i principali parametri chimico-fisici e sono state analizzate le comunità del macrozoobenthos (metodo IBE), al fine di verificare l’impatto ambientale e il rispetto del disciplinare concordato con la GD
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
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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