1,720,994 research outputs found
The role of terrestrial analogs in the exploration of the habitability of Martian evaporitic environments
No full textThe existence of hydrated, salt-rich deposits on Mars has been demonstrated remotely and by rovers, and they have been largely interpreted as deriving from the desiccation of preexisting bodies of standing water. On Earth, terrains considered as Martian analogs of evaporitic environments host diverse halophilic communities, and despite the difficulty of life in salty environments, and the tempo and mode of the preservation of their fossil remains is still a controversial issue, salt-bearing deposits are primary candidates in the search for traces of Martian life
Announcements - FROM AMMONITE TO AMMONIA: THE HISTORY OF FORAMINIFERAL MICROPALEONTOLOGY THROUGH THE COLLECTIONS OF THE GIOVANNI CAPELLINI GEOLOGICAL MUSEUM (BOLOGNA, ITALY)
No full textThe 14 rooms of the Giovanni Capellini Museum of the University of Bologna house one of the most important fossil collections in Europe in a substantially unaltered layout of late 19th Century, which makes it a must-visit museum in Bologna. The Museum was the venue of the Second International Geological Congress in 1881 and here was also founded the Italian Geological Society.
Recently, a permanent exhibition was set up to celebrate the Museum's unique micropaleontological legacy. The exhibition is housed in six large showcases at the ground floor and allows visitors a journey into the history of foraminiferal micropaleontology, from the discovery of the first microfossils, which took place a few miles from the Museum in the early 18th Century, to the first half of the 20th Century when micropaleontology reached a leading role in Earth Sciences
Da rivoluzionari a dirigenti. Movimenti, élites ed innovazioni nella seconda modernità
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
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
Coastal response to climate change: Mediterranean shorelines during the last interglacial (MIS 5)
No full textThe response of shorelines to climate change is controlled by fall and rise of the sea level and
by the alteration of the coastal environment due to changing fluvial discharge and biological activity. In
the Mediterranean this response is complicated by the geographic proximity of the North Atlantic and
the African Monsoon climate systems, by a time and space specific interaction of eustatic and waterload components of sea level and by the mid-latitudinal time lag between orbital forcing and terrestrial
response. Here, six Mediterranean coastal records are presented which contribute to our
understanding of how mid-latitudinal coasts respond to orbital forcing. The sediment sequences show
sharp switches between siliciclastic- and carbonate-dominated nearshore environments where
carbonate-rich sediments are composed of oolitic grainstones. From modern analogues it is deduced
that the oolitic sediments represent a period of relatively high annual sea-surface temperature and lack
of fluvial discharge. The warm-arid period was recorded at ~ 114 ka on the southeast Iberian coast, at
~113 ka on the Levant coast, at ~110 ka on the coast west of the Nile delta and at ~83 ka on the north
Saharan coast. It lasted 10 20 ka in east (Levant coast) and west (Iberian coast) and lasted 40 ka or
more in the central-south of the east Mediterranean. Timing and duration of the coastal proxy allow
inferring instantaneous and dominant response to external forcing in the east and west and delayed
and prolonged response due to dominant regional forcing in the centre of the East Mediterranean. A 9
m eustatic sea-level highstand during MIS 5e is suggested with a start of the subsequent sea-level fall at
~118 ka while evidence for multiple MIS 5e highstand and a highstand during MIS 5a remain elusive
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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