1,721,321 research outputs found
A statistical method to determine total H2O and CO2 budgets in magmas
No full textA recently developed method based on the TVLine concept (Papale, 2005) allows to determine total H2O and CO2 budgets in magmas from melt inclusion data. This method, however, can not be easily applied when multiple groups of inclusions are present in the dataset. This is unfortunately a frequent occurrence in many relevant cases, including recent eruptions of Etna, Stromboli, Campi Flegrei, Vesuvius, and
Kilauea volcanoes. We have developed a statistical method which allows to treat analytical uncertainties and group the data according to a probabilistic criterion. The method includes the following steps: i) hypothesize a number of pairs of total H2O and CO2 necessary to explain the observed data; ii) minimize a χ2-like quantity for each datum by varying the possible H2O-CO2 pairs, and using a model for compositional dependent multicomponent H2O+CO2 saturation in silicate melts (Papale et al., 2006). This step allows the assignment of each datum to a given total H2O-CO2 pair; iii) perform a Monte Carlo simulation to determine the probability of exceeding the obtained χ2, therefore the likelihood of the assumed number of total H2O-CO2 pairs to explain the database. This sequence is repeated for many possible numbers of H2O-CO2 pairs and many assumed values of analytical uncertainty characterizing the dataset. Application of the method to about 30 melt inclusion data from a recent Kilauea eruption spanning CO2 contents in the range 10-300 ppm shows that a minimum of two total H2O-CO2 pairs is required. These pairs show that the melt inclusions formed under two different conditions, the first one characterized by a few wt%, and the second one by less than 1 wt% CO2 abundance
The compositional dependence of the saturation surface of H2O+CO2 fluids in silicate melts
No full textDoes forest age affect soil biodiversity? Case study of land snails in Mediterranean secondary forest
No full textBased on a sampling design used for vascular plants, the effect of forest age (i.e. the time in years since a land patch became a real forest patch as a measure of temporal continuity of forest characteristics) on land snail richness, abundance and composition was assessed in 18 plots in Mediterranean evergreen and deciduous oak forests, belonging to four Sites of Community Importance in Italy. Most examined plots belong to young forests; in particular, three age classes were considered (class 1, <22 years; class 3, 38–56 years; class 5, >77 years). Twenty-seven species and 2433 individuals were recorded. Box plots showed that forest age did not seem to be a key factor for land snail species richness and abundance at least in the time range of examined forests. However, this may not be true, if real old-growth forests are considered. No differences between evergreen and deciduous forest were found too. With regard to species composition, Non-metric multidimensional scaling demonstrated an assemblage of species widespread in all forest age classes, while Indicator Species Analysis failed to identify any species as indicator for any age category. This shows that a process is underway but has had insufficient time to differentiate assemblages and to accumulate the majority of rare species, due to the young nature of examined forests. Habitat structure may affect communities more than forest age: suitable microhabitats (a few old/very old trees for shelter) are a sufficient prerequisite for land snail diversity, ensuring community survival and protection, irrespective of forest age class. These findings highlight the importance of habitat structural complexity at local scale for preserving invertebrate diversity in Mediterranean secondary forests
Corrigendum to "Does forest age affect soil biodiversity? Case study of land snails in Mediterranean secondary forests" [For. Ecol. Manage. 455 (2020) 117693]
No full textThe authors regret that Table 4 contains some wrong values (R2 instead of Adjusted R2 values) concerning explained variation in variation partitioning analysis. Incorrect values are reported in Table 4 ([A + B + C + D + E + F + G]; [A + D + F + G]; [B + D + E + G]; [C + E + F + G]) and one also in text ([A + B + C + D + E + F + G], i.e. total variation explained by all predictors). This resulted in an erroneous summation of variation fractions in the aforementioned table. Fractions statistically tested were reported correctly. Authors would like to confirm that these changes will have only some minor consequences since they do not affect conclusions as well as other sections in the manuscript. A corrected version of Table 4 is attached. The authors would like to apologise for any inconvenience caused
SISTEMI DI RIVESTIMENTO IN ACCIAIO PER L’OVER –CLADDING DI EDIFICI ESISTENTI: ASPETI COSTRUTTIVI E IMPLEMENTAZIONE DI UNA METODOLOGIA PROGETTUALE BIM.BASED
No full textGlobal regularity for a slightly supercritical hyperdissipative Navier-Stokes system
Full text linkWe prove global existence of smooth solutions for a slightly supercritical hyperdissipative Navier--Stokes under the optimal condition on the correction to the dissipation. This proves a conjecture formulated by Tao [Tao2009]
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
- …
