1,721,060 research outputs found
Variazione del livello delle acque di fondo della grotta A.F. Lindner (829/3988 VG) in relazione alle piene del Timavo
No full textL’impiego delle fonti cartografiche storiche e delle immagini aeree oblique nello studio delle dinamiche territoriali del litorale laziale settentrionale
No full text
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
Hazard connected to railway tunnel construction in karstic area: applied geomorphological and hydrogeological surveys.
No full textIn a mature karstic system, the realisation of galleries
using the methodology of railway tunnel boring machine
(TBM) involves particular problems due to the high
risk of interference with groundwater (often subject to remarkable
level variations) and with cavities and/or thick fill
deposits. In order to define groundwater features it is necessary
to investigate both hydrodynamic and karstification.
To define and quantify the karst phenomenon in the epikarst
of the Trieste Karst (Italy), an applied geomorphological approach
has been experimented with surface and cavity surveys.
The surface surveys have contributed to determining
the potential karst versus the different outcropping lithologies
and to define the structural setting of the rocky mass also
through the realisation of geostructural stations and the survey
of the main lines thanks to photo-interpretation. Moreover,
all the dolines and the cavities present in the area interested
by the gallery have been studied by analysing the
probable extension of caves and/or of the secondary fill deposits
and by evaluating the different genetic models. In an
area 900m large and 27 km long, which has been studied because
of the underground karst, there are 41 dolines having
diameters superior to 100m and 93 dolines whose diameters
range between 100 and 50 m; the dolines whose diameters
are inferior to 50m are 282. The entrances of known and
registered cavities in the cadastre records are 520.
The hypogeal surveys have shown 5 typologies in which it
has been possible to group all the cavities present in a hypothetical
intersection with the excavation. The comparison between
surface and hypogeal structural data and the direction
of development of cavities has allowed for the definition of
highly karstified discontinuity families, thus having a higher
risk.
The comparison of the collected data has enabled to identify
the lithologies and areas having major risk and thus to
quantify the probability of intersection with the different cavity
typologies for each area. To make an example, out of27 000m of studied gallery 3930 are the metres expected to
be at very high ”karst risk”. Out of these, as a whole 310 are
risky because of the probable presence of gallery cavities,
2170 because of the probable presence of pits and sinkholes
diffusely present under the dolines, and along 1450m karst
is particularly intense. Moreover, 2200 should be the metres
in which the rocky mass will be particularly divided because
of tectonic causes.
From a hydrogeological point of view a monitoring of water
level has started to quantify water excursion, due to closeness
of the railway tunnel to the mean water level. First results
related to galleries intersection are here presented
The effects of siRNA-mediated inhibition of E2A-PBX1 on EB-1 and Wnt16b expression in the 697 pre-B leucemia cell line.
No full textVariations 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
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