1,721,058 research outputs found
SHARE Information System: un database geografico condiviso per il monitoraggio degli ambienti di alta quota
No full textThe scientific and technological research project SHARE (Stations at High Altitude for Research in the Environment) is an Italian project aimed to study and to monitor environment and climate in mountainous areas. SHARE is promoted by EvK2-CNR Committee with the participation of Italian and international research institutions and in collaboration with the Joint United Nations Programme for Environment (UNEP). This research aims to improve the level of dissemination and sharing of knowledge and information on environmental and land acquired in past projects and ongoing activities related to the project through SHARE. The creation of a platform for web services based on the architecture of GeoNetwork Opensource represents the main instrument for implementing and structuring a system for sharing data and metadata in an integrated network of focal point
Analyses and comparisons of 7Be, 210Pb and activity ratio 7Be/210Pb with ozone observations at two GAW stations from high mountains
No full textSimultaneous measurements of 7Be and 210Pb and the analyses of activity ratio, i.e., 7Be/210Pb, offer another useful analytical tool for improving our understanding of ozone changes occurring at high altitude because they can provide diagnostic indicators of horizontal and vertical exchange processes of transport. The increase (decrease) of 7Be with decrease (increase) of 210Pb associated with high (low) value of 7Be/210Pb generally indicates the mechanisms associated with vertical (for being favorable to the horizontal) transport occurring. Distinct transport processes and background conditions for two Global Atmosphere Watch (GAW) stations, Mt. Waliguan (36.29o N, 100.90o E, 3816 m a.s.l.) and Mt. Cimone (44.18o N,10.7o E, 2165 m a.s.l.) located in the high mountains of China and in Italy, respectively, are presented. We have performed the frequency distribution analyses and various comparisons of 7Be with 210Pb, the surface ozone with 7Be and 7Be/210Pb. Our study reveals that the maximum ozone levels occur in the summer and minimum levels occur in the winter at these two high mountain stations. Our analyses show that the processes of the stratospheric intrusions/upper tropospheric transport combined with the long-range transport from polluted areas over eastern/central China are the mechanisms that cause the ozone summer peak at the Mt. Waliguan station. The ozone summer peak at the Mt. Cimone station is mainly the result of photochemical production in the lower atmosphere associated with the transport of polluted air masses on regional and continental scale. Frequency distribution analyses of the concentrations of 7Be, 210Pb and the values of 7Be/210Pb can be well represented by the log-normal distributions. Strikingly, we have found that the similarities of bimodal distributions for 7Be/210Pb, at these two stations are clearly exhibited, except for the magnitude, although the log-normal distributions of 7Be and 210Pb, with the noteworthy difference in altitude of these two stations, are significantly different. The measurements of 7Be and 210Pb accompanied with the analyses using 7Be/210Pb activity ratio, can enhance our understanding of the transport processes in the atmospher
Measurements of Chlorofluorocarbons and their Replacement Compounds at Monte Cimone: Results Obtained After Eighteen Months of Observations
No full textChlorofluorocarbons and their substitutes are anthropogenic compounds strongly involved in global change phenomena. Therefore, their atmospheric mixing-ratios are monitored on a worldwide scale. In order to evaluate source strength of these compounds in Southern Europe, in 1999 a research activity, monitoring these compounds in the atmosphere of the Monte Cimone (MO, Italy) was started. Air samples, collected on a weekly base, were analyzed using a GC-MS methodology recently devised by our group. The reported results, obtained after eighteen months of observation, are relative to four fully halogenated halocarbons and four hydrogenated halocarbons
STRATOSPHERIC INTRUSION INDEX AS DEFINED BY FOUR YEARS OF MEASUREMENTS AT THE MT. CIMONE STATION
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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
Tropospheric NO2, SO2 and O3 long path measurements by a DOAS system in a polluted urban area.
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