1,721,001 research outputs found
L'ISSKA, un institut au service de la spéléologie
No full textLuetscher Marc, Jeannin Pierre-Yves. L'ISSKA, un institut au service de la spéléologie. In: Karstologia : revue de karstologie et de spéléologie physique, n°38, 2e semestre 2001. Formations superficielles du Larzac central et Traçages dans les Alpes de Berchtesgaden. pp. 49-50
A last interglacial speleothem record from the Sieben Hengste cave system (Switzerland): implications for alpine paleovegetation
No full textOxygen (d18O) and carbon (d13C) isotope data of a Last Interglacial speleothem (c. 134-117 ka) from the Sieben Hengste cave, Switzerland. The data underline the ocean control on North Alpine climate and provides firm evidence that the sample preserves a regional temperature record. The climate optimum is dated at 128.1 ± 1.2 ka
Oxygen and carbon isotope data of a Last Interglacial speleothem from the Sieben Hengste cave, Switzerland
No full textEventos extremos de inundación en el Mediterráneo Occidental: integrando modelos numéricos y registro de inundaciones en sistemas kársticos (proyecto MODKARST)
Get PDFChanges in rainfall patterns are a direct consequence of the current climate change. Climate projections indicate an intensification
of extreme rainfall events, which will directly affect social, ecological, and economic systems.One of the most significant challenges
in the field of climate science lies in comprehending, modeling, and
forecasting the fluctuations in flood occurrences derived from these
extrem rain events. The uncertainties in projected rainfall remain notably elevated, especially in Mediterranean where the climate is characterized by extreme and sudden rainfall events. The instrumental
record is too short to correctly estimate flood return periods. Hence,
geological records are required to better understand the long-term
variability, from millennial to decadal scales, of natural extreme flood
events. MODKARST is a MSCA-GF project awarded by the European
Union, to develop a quantitative flood database for the Western Mediterranean realm based on speleothems. The action plans to infer
past flood events from the last 18 ka based on detrital layers recorded in stalagmites from 5 different caves in the north of Spain, in
combination with karst hydraulic models and water-level monitoring. MODKARST will help to better disentangle the relation between
flood recurrence and climate changes, and will shed light on how to
better predict the variability of floods in the context of present-day
global warmingLos cambios en los patrones de lluvia son una consecuencia del
cambio climático actual. Las proyecciones climáticas indican una
intensificación de los eventos extremos de lluvia, que afectarán a
los sistemas sociales, ecológicos y económicos. Uno de los mayores
retos de la ciencia climática es comprender, modelar y predecir la
variabilidad de las inundaciones derivadas de estas lluvias extremas.
Las incertidumbres en las proyecciones de las precipitaciones futuras
siguen siendo elevadas, especialmente en el Mediterráneo donde
el clima se caracteriza por lluvias extremas y repentinas. El registro instrumental es demasiado corto para estimar correctamente
los períodos de retorno. Así, el registro geológico es fundamental
para conocer la variabilidad a largo plazo de los eventos naturales
de inundaciones extremas. MODKARST es un proyecto MSCA-GF
otorgado por la Unión Europea, para desarrollar una base de datos
cuantitativa de inundaciones para el Mediterráneo occidental basada en espeleotemas. Este proyecto pretende inferir inundaciones
pasadas de los últimos 18 ka registradas en estalagmitas de 5 cuevas
del norte de España, combinando modelos hidráulicos y monitorización del nivel del agua. MODKARST ayudará a comprender mejor la
relación entre la recurrencia de inundaciones y los cambios climáticos, así como también ayudará a predecir mejor la variabilidad de
las inundaciones en el contexto del calentamiento global actua
Going Beyond Counting First Authors in Author Co-citation Analysis
Get PDFThe 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
Get PDF“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
Get PDFWe 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
Get PDFWe 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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