1,720,959 research outputs found
Struttura fisica della conoide alluvionale gigante del Fiume Taro e ricarica degli acquiferi della pianura parmense
No full textUsing a large set of stratigraphic data, numerous cross-sections of the sauthern margin of the Parma alluvial plain were drawn; they allowed the recognition of the architecture of the Taro al/uvia! fan and the water flow pattern from the sur1ace to the unconfined and confined aquifers.
The middle (Medesano-Madregolo) and outer portion of the al/uvial fan system are separated by an anticline, named Madregolo high, which controls the groundflow pattern with its impermeable basement uplifted al about -70 m from ground level. In its outer portion the fan has giant dimensions extending up to 15 km axial/y and up to 20 km normal/y to the depositional strike. The sedimentation of the Middle-Late Pleistocene alluvium is strongly refated to clima tic changes. GeneraI and !oca! evidence permit
the assignment of the tens of meter thick coarse fJuvial deposits to cold (glacia!) periods and of the meters thick fine al/uvium to warm (interglacial) periods.
The base of the al/uvial fan rests on a lateral/y continuous confining layer dated 180.000 yr BP. At the intersection Taro RiverAutostrada A 1 this layer is encountered at -130 m from ground level; confining layers of lesser importance, internaI to the alluvial fan body, are encountered at -40 and -80 m from ground level.
In front of the Madregolo high the coarse sedimentary units (aquifers) of the al/uvial fan body are amalgamated. Northwards these aquifers expand in lhickness and are put under pressure by the intervening confining fayers. This indicates that the groundwater f10w pattern is from the front of the Madregolo high northwards into the unconfined and confined aquifers of the thickest part of the fan
Three-Dimensional Representation of Permeability Barriers and Aquifers Recharge in the Pleistocene Deposits of the Parma Alluvial Plain
No full textArchitettura deposizionale del Pleistocene superiore nel sottosuolo della media pianura emiliana
No full textRappresentazione tridimensionale delle barriere di permeabilità nelle alluvioni pleistoceniche del sottosuolo della pianura di Parma
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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
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