1,720,992 research outputs found
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
First observations about morpho-sedimentological and vegetational aspects of the dune field of S.Ena – Sa Chitta and Iscra Ruja coast (NE- Sardinia)
No full textThe aim of this project is the study of the evolution of the dune field of Capo Comino, between S.Ena-Sa Chitta and Iscra Ruja, by the integration of sedimentological, morphological and vegetational data. This approach has been already used in northern Sardinia (Platamona –SS) where we obtained very good results to understanding the evolution of the dune field and also to establish also the quality and naturality of this area (Balduzzi et al., 2004; Vagge et al., 2007). The target is to fix the elements for a future monitoring.
Our idea is to test the model in a non-anthropized coastline, that presents different local conditions.
In the first phase of this work we will analyze the general characteristics of the area like the bioclimate, the wind-wave climate, the mapping of the dune field by aerial photography analysis and their final cartographic representation. The second phase will imply several field measurements to study vegetational aspects (by phytosociological methods) in order to establish the present phytocenosis, their ecology and dynamic. It will be also possible to obtain several morphological and sedimentological data in order to highlight the characteristics of the sedimentary environment and the aeolian transport.
The integration of vegetational, sedimentological and morphological data will be obtain by the analysis of several transects carried out along the lines of dominant winds, that will outline the dune field. Vegetational data and sedimentological samples will be collect along these transects to allow a correct interpretation about coastline evolution.
The previous vegetational and sedimentological data, the satellite and cartographic reliefs and field measurements have already allowed to establish that, even if the anthropic impact is not so considerable, the dune field had some modifications and a considerable erosive process due to several factors (not in the least the natural sea ingression due to storm events). Erosion processes seem to hit the beach, in particular in the central sector that is subjected to the storms coming from the Tyrrhenian Sea. The most wide and high dunes are located in the southern sector of the beach where the dune field have its maximum extension and the phytocenosis have good quality and naturality. The back dune is occupied by some agricultural land uses that sometimes were be taken from the levelling of the dune field and were cultivated in the last few years. Balduzzi I., Bozzano A., Corradi N., Mariotti L.M., Vagge I., 2004 - The evolution of the dune fields of Platamona-Marritza (Northern Sardinia) using remote sensing and aerial imagery. Chemistry&Ecology Vol. 22 N° 4 (1): 371-381. Vagge I., Corradi N., Ferrari M., Balduzzi I. & Mariotti L.M., 2007 - Aspetti vegetazionali e morfo-sedimentologici dei campi dunari di Platamona-Marritiza con particolare riguardo all'area di Marina di Sorso (Sardegna settentrionale). Fitosociologia 44 (1): 33-48
Le contrôle de l’érosion dans les systèmes barrière-lagune: le champ dunaire de Capo Comino (Sardaigne nord-orientale, Italie) = The erosion of the barrier system of Capo Comino (North-East Sardinia, Italy)
Full text linkThe study of the delicate balances of the coasts has a crescent interest in the scientific and administrative communities because of the role of the coastal systems in the economic development. Indeed, during the 70s the littoral zone underwent to the strong urban development and tourist industry. Now the main need is to find an equilibrium between the necessities of the protection of the coastal environment and the human needs (ICZM Protocols), following the target of the preservation of the beaches and the coastal systems.
The coast of Capo Comino, located in the north-eastern coast of Sardinia and partially included into a Zone of Community Interest ( SIC-ITB020012), is not influenced by human impact.
The analysis of aerial photos allowed the study of the evolution of the coastline, the dune field and its vegetation between 1954 and the 2006. The field monitoring of the dunes (2003-2011) was also made by transects, in order to evaluate the morpho-sedimentological and vegetation dynamic of this sector.
The data presented in this paper allow to understand that the erosion of the area is not strong and the regradation of the coastline is about 10-15 meters in the northern sector and 40 meters in the central one.
The migration of the dunes, instead, is very important, with the mouvement of huge volumes of sand. The number and areas of the blowouts has increased too.L’étude des équilibres délicats des systèmes littoraux connait un intérêt croissant dans les communautés sciéntifiques et administratives pour l’importance que les systèmes côtiers ont dans le développement économique des régions littorales. En effet, la bande côtière a été très intéressée par le développement urbanistique et l'industrie touristique qui doivent maintenant trouver un point d'équilibre (ICZM Protocols) avec les nécessités de protection de ce milieu fragile, tant pour le patrimoine naturel que pour la conservation des plages face à l’érosion.
Le littoral de Capo Comino, situé sur la côte nord-orientale de la Sardaigne et partiellement inséré dans une Zone d'Intérêt Communautaire (SIC-ITB020012), est encore peu soumis aux pressions anthropiques.
L’analyse des photos aériennes a permis l'étude de l'évolution de la ligne de rivage, des champs dunaires et de la végétation entre 1954 et 2006. Le suivi du champ dunaire (2003-2011) a été effectué par des transects, de façon à pouvoir analyser l'évolution morpho-sédimentaire et végétale du secteur.
Les données présentées dans ce travail ont permis de relever que l’érosion du littoral est très réduite : le recul de la ligne de rivage a atteint 10-15 mètres dans le secteur septentrional et environ 40 mètres dans une petite portion du secteur central. On a surtout relevé une augmentation des zones de déflation et des blowouts, avec une migration importante des volumes de sable le long de la direction principale de transport et la formation de nombreuses zones d’érosion éolienne
Applicazioni GIS per lo studio degli aspetti morfologico-vegetazionali del campo dunare di Capo Comino (Sardegna NE)
No full textAn integrated monitoring procedure of coastal dune fields : The example of Capo-Comino area (NE-Sardinia, Italy)
No full textMonitoring plans are very important in order to improve ICZM protocols because of their contribution to the analysis, the conservation and the preservation of coastal sandy ecosystems.
Multidisciplinary studies are required for a well understanding of natural systems’evolution in consideration of their delicate equilibrium and dynamics. In fact, as an example, coastal dune fields fell the effects of natural and anthropic constrains and they react relatively fast to these stress.
We present the results of the experimentation of a new procedure of monitoring, that relates the morphological and sedimentological characteristics of the dune system and those of the vegetal associations that identify it. We suggest obtaining the best possible description of the landscape in quali-quantitative values by different disciplines.
This method plans a first essential analysis by remote sensing and a following field work collecting sedimentological, morphological and vegetational data (by phytosociological method) along several transects, systematically repeated in the years in order to highlight the medium-long term changes.
The use of survey systems, based on vegetal associations’ distribution, allows planning a strategy for the geomorphological and topographical survey that is/were simpler and faster if you have to work on huge study areas. In fact, as an example, considering the distribution and the ecological valence of the associations, it’s possible to give indications about dune field sides, using some enough reliable interpolations.
After a first application in an anthropic study area, Platamona (North Sardinia) (1, 2), we improved our studies in Capo Comino area. This area, characterized by natural and very complex conditions and only partially included in SIC-ITB020012, has been monitoring from 2003 (3) until now. In order to better understand the actual dynamics in the dune field, it has also been very important to study the submarine beach in a morpho-sedimentological point of view – by bathymetric lines and sample’s collection – and by the observation and the mapping of Posidonia oceanica meadows because their considerable importance on the sediment dynamics.
In general results show a slow erosive trend, highlighted by morphological and vegetational changes. We found the degradation - and sometimes the disappearance - of few phytocenosis in the dune field.
1) Balduzzi I., Bozzano A., Corradi N., Mariotti L.M., Vagge I. (2004). The evolution of the dune fields of Platamona-Marritza (Northern Sardinia) using remote sensing and aerial imagery. Chemistry&Ecology, Vol. 22 N° 4 (1): 371-381.
2) Vagge I., Corradi N., Ferrari M., Balduzzi I., Mariotti L.M. (2007). Aspetti vegetazionali e morfo-sedimentologici dei campi dunari di Platamona-Marritiza con particolare riguardo all'area di Marina di Sorso (Sardegna settentrionale). Fitosociologia 44 (1): 33-48.
3) Balduzzi I., Corradi N., Ferrari M., Vagge I. (2009). First observations about morpho-sedimentological and vegetational aspects of the dune field of S.Ena’ – Sa Chitta and Iscra Ruja coast (NE- Sardinia). 45th International Conference SISV & FIP "Biodiversity Hotspots in the Mediterranean Area", Cagliari (IT), 22-24 and 25-29 June 2009, p. 185 (abs.)
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
Monitoring and Management of coastal Habitats : Capo Comino Case Study (NE Sardinia, Italy)
No full textIt’s well-known that coastal systems are characterized by a delicate equilibrium and strong dynamics. After the census
of the priority habitats and the institution of SICs (Site of Community Importance), the monitoring and management are
a necessary step in order to protect their biodiversity.
From this point of view we present the results of the test of a new monitoring procedure on coastal dune fields, that
integrates few different sciences (geomorphology, sedimentology and botany). This method plans a first essential analysis
by remote sensing and a following field work in order to collect sedimentological, morphological and vegetational data
(by phytosociological method) along several transects, systematically repeated.
Sardinia (Italy) was chosen like our experimental laboratory. After a first application in an anthropic study area, Platamona
(N Sardinia) (Balduzzi et al., 2004, Vagge et al., 2007), we directed our studies to Capo Comino area, characterized by
natural and very complex conditions.
Capo Comino area, only partially included in SIC-ITB020012, has been monitoring from 2003 until now. Results show a
slow erosive trend, highlighted by morphological and vegetational changes. We found the degradation - and sometimes
the disappearance - of few priority habitats, in particular 1120 (Posidonia beds - Posidonion oceanicae), 2120 (shifting
dunes along the shoreline with Ammophila arenaria – white dunes), 2210 (Crucianellion maritimae fixed beach dunes)
and 2250 (coastal dunes with Juniperus spp.).
Balduzzi I., Bozzano A., Corradi N., Mariotti L.M., Vagge I. (2004). The evolution of the dune fields of Platamona-Marritza
(Northern Sardinia) using remote sensing and aerial imagery. Chemistry&Ecology, Vol. 22 N° 4 (1): 371-381.
Vagge I., Corradi N., Ferrari M., Balduzzi I., Mariotti L.M. (2007). Aspetti vegetazionali e morfo-sedimentologici dei
campi dunari di Platamona-Marritiza con particolare riguardo all’area di Marina di Sorso (Sardegna settentrionale).
Fitosociologia 44 (1): 33-48
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