1,720,972 research outputs found
Pliocene-pleistocene vegetational and climatic evolution of the south-central mediterranean
No full textThe vegetational history of the south-central Mediterranean clearly reflects the major global climatic changes of the last four million years. A Mediterranean-type climate, characterized by strong seasonality and a dry summer, may have existed in this region during the early Pliocene. A short-term climatic cooling at approximately 3.2 Ma resulted in the temporary establishment of a humidity-demanding flora; the onset of major Northern Hemisphere glaciation at approximately 2.4 Ma initiated an alternation between humid (glacial) and dry (interglacial) conditions. Vegetational differences between this region and the north-west Mediterranean indicate that distinct latitudinal climatic gradients probably existed in the Mediterranean during the Pliocene-early Pleistocene. © 1989
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
Firts remarks on Late Pleistocene lacustrine deposit in the Berceto area (Northern Apennines, Italy)
No full textStudio di una piccola torbiera montana dell'Appennino Emiliano attraverso i microfossili vegetali
No full textLa deglaciazione alpina nel Vallone Bellunese, Alpi Meridionali Orientali
No full textThis study deals with the glacial land forms and deposits of the Vallone
Bellunese (Piave glacier) which date back to a period that began
with the alpine deglaciation and ended with the Bolling interstadi al. This
period was characterized by a rapid increase of temperature and a retreat
of glaciers from the main alpine valleys. Through the investigations carried
out in the last years, in particular detailed geomorphological mapping,
drillings, rad iometric datings and pollen analysis of two peat-bogs
(Modolo and Chiesurazza), it has been possible to reconstruct an upto-
da te chronological outline of the geomorphological evolution of this
area during the Late Pleistocene-Holocene, and to improve the present
knowledge on the alpine deglaciation in the south ern side of the Alps.
The Salce Stadial is defined ; in that stadial the equilibrium-line altitude
was abo ut 1660 m and therefore it could be considered as one of the
«anc ient stadia ls» that occurred just after the LGM . The Salce Stadia!
had climatic conditions not so different from those of the LGM and an
age between 16,200 and 15,000 years BP, therefore it is older than
Bolling interstadial
Caratteristiche lito-sedimentologiche e micropaleontologiche (Foraminiferi, Dinoflagellati, Pollini e Spore) di successioni "tripolacee" plioceniche del Bacino di Caltanissetta.
No full text- …
