1,721,082 research outputs found
Dinamica ed evoluzione climatologica delle grotte ghiacciaie : geomorfologia e geologia del quaternario
No full textIce deposits have a remarkable potentials to conserve climatic information. Ice cores give the most precise and direct records of some atmospheric parameters. These cores carry some evidences of the atmospheric composition and temperature change that characterized part of the climatic history. Hypogean ice deposits make ice caves an interesting field of study. Problems that are encountered during the studies of hypogean ice deposits are quite different from that of “classical glaciology”. To study this precious archive, both epigean and hypogean data should be incorporated. It is only by understanding the interactions of these two environmental conditions that is possible to give a significant paleoenvironmental interpretations. Hypogean and epigean microclimatic monitoring system were installed in Moncodeno (Grigna Settentrionale) in October 2004. The epigean meteorological stations record every hour air temperature, air humidity, wind direction and velocity and global solar radiation. Within the cave air temperature was recorded in seven distributed all along the section of the ice cave, where as air humidity was recorded in three stations. Air direction and velocity was recorded in one station by an ultrasonic anemometer. Moreover rock temperature was recorded at two depths, 10 cm and 40 cm, and ice temperature on the surface. In this work data of the first monitoring year (October 25, 2004 – October 24, 2005) are presented. Epigean and hypogean data are studied and compared in relation to the seasonal variations. A conceptual model will be forwarded to explain the existing conditions manifested in the LO LC 1650 “Abisso sul Margine dell’alto Bregai” Ice Cave. In this study, two different methods applied on two different systems of ice deposits are described. These are; the ice deposit of LO LC 1650 “Abisso sul margine dell’alto Bregai” in Moncodeno (Grigna Settentrionale, Italy), and the ice deposit of Focul viu in Apuseni Mountains (Romania). Evolutional histories of these ice deposits are quite different, i.e., the LO LC 1650 is an endogenous ice deposits where as the Focul viu is an exogenous ice deposits
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
Geological setting of a Pleistocenic glacier marginal area: an example from the northern Po Plain (Lombardia)
No full textVariations 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
Lo "Stefan problem" utilizzato per interpretare le condizioni di congelamento di un lago ipogeo nella ghiacciaia LO LC 1650 (Moncodeno, Lecco - Italia)
No full textSome observations on the structure and morphology of an ice deposit in the "Abisso sul margine dell'Alto Bregai" Cave (Grigna Settentrionale, Italian Alps)
No full textThe Moncodeno area is found on the northern slope of the Grigna Settentrionale massif (Lecco, Lombard Pre Alps). The existence of perennial ice deposits in these caves at altitudes of about 1800 to 2000 m a.s.l. has long been known, the first written description dating back to Leonardo da Vinci. The ice deposit we investigated is found between two vertical shafts in the cave "Abisso sul margine dell'Alto Bregai", at a depth of about 80 m below the entrance, where no snow can reach it because of the cave topography.
The deposit shows a more than 15 m thick succession of clear ice strata with crystal size ranging from about one centimetre up to several centimetres. Locally, clayey interstrata up to several millimetres thick are present at certain stratigraphic depths. Air circulation in this seasonally snow-sealed tube à vent cave produced a large tunnel in the ice. The deposit internal structure is dominated by an ablational angular unconformity separating a lower tilted and faulted part from an upper, horizontally bedded
one. Below the stratigraphic gap a refrozen englacial drainage tunnel can be observed. The present ice deposit morphology shows a drainage network organized around two bédières collecting both ice meltwater and dripping related to rainfalls and seasonal snow melting outside the cave. A small channel leading to the bediérè from a shallow, flat-bottomed water pan with overhanging walls at the lateral ice-rock contact, some dripping-related vertical holes and widespread minor drainage features due to
preferential ablation along crystal boundaries are also present. An interesting, stalagmite-shaped relief of uncertain origin is described.
By the analysis of superposition and intersection relationships among stratigraphic, structural and morphological features we outline a relative history of accumulation and ablation stages. Building on previous findings we discuss some implications of these observations with respect to the ice deposit’s age and to hypogean and local epigean climatic evolution, and we compare
the situation outlined in the 1973 topographic survey to the present one
Omalizumab in persistent severe bakers_ asthma
No full textOmalizumab in persistent severe bakers_ asthm
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