1,720,964 research outputs found
Vertical facies evolution of the Tufiti di Tusa Formation cropping out in the Lucanian Apennines (Southern Italy)
No full textA bed by bed facies analysis of the late Oligocene-early Miocene Tufite di Tusa Formation, cropping out along the Rotondella Ridge (Lucanian Apennines external wedge), allows us to point out how its turbidite facies and related processes change with time. In this area, the aforementioned formation, belonging to the Rocca Imperiale Sicilide Unit, lies stratigraphically on the Argille Varicolori Formation; it is about 230 metres thick with a lower portion (about 160 meters) characterized by calciclastic and siliciclastic turbidites, and an upper portion (about 70 metres) dominated by volcanoclastic sediment gravity flow deposits. The most peculiar facies of the studied stratigraphic succession are: Bed types 1) thin to very thick fine-grained normally graded beds with plane-parallel to slightly undulated lamination, ripples and convolute lamination; this facies can be related to low-density fully-turbulent flows. Bed types 2: thin to very-thick fine-grained normally graded tabular beds with vergent convolute lamination, hummocky-type structures, biconvex ripples and megaripples usually with sigmoidal laminae; the paleocurrent directions indicated by the sedimentary structures are often different from one another; this facies can be interpreted as deposited by low-density fully turbulent flows, which experienced ponding and rebound processes. Bed types 3: very-thick coarse to fine-grained tabular beds composed of a basal coarse-grained sandstone, an intermediate fine to medium-grained sandstone with structures similar to those of bed types 2, and an upper very-thick mudstone unit; the paleocurrent directions indicated by the sedimentary structures are different from one another; these beds can be interpreted as deposited by large-volume bipartite sediment gravity flows, which underwent ponding processes. Bed types 4: very-thick, fine to coarse-grained tabular tripartite beds with an intermediate slurry muddy sandstone often including mudstone clasts and pseudonodules, organic matter and liquefaction structures; this facies is generally associated with hybrid sediment gravity flows previously enriched in mud through erosive processes favoured by slope changes or intrabasinal highs. Bed types 5: very-thick coarse to fine-grained tabular and normally-graded beds characterized by a lower coarse to medium-grained massive sandstone, overlain by a thin fine-grained unit; this facies can be interpreted as related to large-volume bipartite sediment gravity flows with an upper low-density turbulent flow able to bypass the depositional areas of the lower high-density flow. Bed types 6: thin to thick slightly calcareous mudstone to calcareous marl beds. In accordance with the vertical facies distribution, the stratigraphic log can be subdivided into three main intervals: a basal one composed of bed types 1, 2, 3 and 6 (between 0 and about 54 meters); an intermediate interval characterized by the occurrence of bed types 4, which are associated with beds 1, 2, 3 and 6 (between about 54 and 190 meters); a top interval characterized by the occurrence of bed types 5, which are associated with facies 1, 2, 4 and 6 (between about 190 meters and the top of the section). The vertical facies changes give informations about the turbidite system evolution where morphologic confinement played a major role in determining facies characteristics
Contained-reflected turbidites and Slurry Beds in the Tufiti di Tusa Formation. Examples from Lucanian Apennines (Southern Italy) and their significance
No full textTectonic control on trench-type basin stratigraphic succession in Apenninic-Maghrebian Orogen. An example from the Tufiti di Tusa Formation (Calabria - Lucania border, Southern Italy)
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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
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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