1,721,088 research outputs found
ISTHMOS PROJECT: Nora, ex area militare. La cisterna
No full textPoster presentato in occasione del XVII Congresso Internazionale di Archeologia Classica “Incontri tra culture nel mondo mediterraneo antico” tenutosi a Roma tra il 22 e il 26 settembre 2008
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
Studying and monitoring large landslides with persistent scatterer data
Full text linkThis work is focused on very slow moving land-
slides and the new generation of Persistent Scatterers
PSI (SqueeSARTM processing, developed by Telerile-
vamento Europa) that allows to increase the density
and the time series quality of interferometric data. The
improvement in the time series quality helps also to
understand the behaviour of some processes and to
have a best comparison with traditional monitoring
system and/or rainfall data.
The consequent aim of the research is to evaluate
the potential and the limitations of PSI data for large
landslide studying and monitoring.
Some large landslides belonging to different geo-
logical, geomorphologic and land-use contexts and
with different monitoring systems, in Western and
Ligurian Alps, Langhe Hills and a portion of North-
ern Apennines (Oltrepò Pavese), have been analyzed.
The study area is covered by 18 years of SAR data,
consisting on ERS (1992- 2001) and RADARSAT
platform (2003-2010).
The results show that the PSI analysis is useful
both on regional and local scale. At regional scale PSI
allows to improve landslide inventories. At local scale
the PSI joined with other data can help in the under-
standing landslide features and kinematics
The contribution of Hypercolorimetric Multispectral Imaging for investigating religious artworks
No full textMedusivorous fishes of the Ligurian sea 1. Chub mackerels and other pelagic fish species sometimes "Have the Medusa" Pelagia noctiluca
No full textDuring blooms of Pelagia noctiluca periodically occurring in the Ligurian Sea (North Western Mediterranean), a natural mark,
formed by the jellyfish pigments, characterizes fish eating this species
A novel method for landslides investigation through A-DINSAR time series
No full textIn recent years, Advanced Differential Interferometric Synthetic-Aperture
Radar A-DInSAR technique has advanced rapidly for detecting and
monitoring ground surface deformations due to landslides. Identification
of the areas affected by ground motion through A-DInSAR data is generally
based on visual inspection and hotspot or cluster analysis of average
displacement rates. However, interpreting A-DInSAR time series of a
particular area provides a better indication of the real trend of displacement
of a landslide, while identifying the possible moment of acceleration of the
deformation process as well. A novel methodology is then proposed for
identifying different typologies of ground motion areas mainly related to
landslide phenomena at a regional scale, by means of A-DinSAR data at high
spatial and temporal resolutions. This methodological approach was tested
and validated in Piedmont region northern Italy, by means of RADARSAT
and COSMO-SkyMed satellite data, in both ascending and descending
modes. Linear constant in time displacement and non-linear acceleration
or deceleration in the displacement rate trends were recognised, allowing
characterisation of the kinematic pattern of a landslide or a portion of it. Local
and site-specific scale analyses, performed in an Alpine valley and in two
hillslopes representative of the main geological/geomorphological contexts
of the study area, validated the results obtained at the regional scale. This
supported the interpretation of the driving mechanism for such known
landslides, or other geological processes which can cause ground motion
along slopes. The developed procedure can allow one to specify priority
areas for prevention activities, in order to optimise the costs and benefits
of designing a plan to monitor instability phenomena at regional and sitespecific
scales. Moreover, ground motion areas identified by different sensors
in the same landslide help in the characterization of the state of activity of
this phenomenon, identifying also possible moments of re-activation
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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