1,721,005 research outputs found
Possibilità di stoccaggio geologico di CO2 in Lombardia
No full textLa ricerca è volta allo studio e alla valutazione delle possibilità di stoccaggio della CO2 in formazioni geologiche profonde della Regione Lombardia. La prima parte del lavoro riguarda lo studio della quantità di emissioni annue prodotte sul territorio regionale, sia di tipo concentrato (attività industriali, centrali per la produzione di energia, etc.), sia di tipo diffuso (trasporto, riscaldamento domestico, etc). Il lavoro prosegue con l’analisi dello stato dell’arte sulle tecniche di cattura e stoccaggio della CO2, riportando in particolare i progetti e le esperienze pilota tuttora in corso in vari paesi del mondo. Sono stati inoltre analizzate anche numerose forme di accordo istituzionale attive tra governi, istituzioni, produttori di CO2 e imprese private. La seconda parte del lavoro riguarda invece la valutazione delle possibilità tecniche di stoccaggio della CO2 nel sottosuolo lombardo (in giacimenti di idrocarburi esauriti, o in via di esaurimento, e in acquiferi salini profondi). Lo studio si conclude con l’identificazione di un possibile sito di stoccaggio CO2 in Regione, sito in un acquifero salino profondo, e con alcune indagini preliminari per il possibile avvio sperimentale di un impianto pilota, volte in particolare alla modellazione geologica e idrodinamica del sito ritenuto più idoneo
The effect of the organic matter composition on POPaccumulation in soil
No full textThe effect of different humic fractions on polychlorinated biphenyl (PCB) contamination in soils was tested in the field by means of 53 soil samples from a high altitude grassland plateau in the Italian Alps. The three humic fractions (humin, humic acids and fulvic acids) were characterised in parallel by quantifying 12 PCB congeners to establish a direct relationship between PCB levels and humic fraction concentrations. Humin (the most hydrophobic fraction) appears to be the most closely correlated with the amount of PCBs in soil (R2 = 0.83), while fulvic acid shows the lowest correlation (R2 = 0.49). The idea of preferential sorption of hydrophobic compounds in the humin fraction is discussed, and the humin carbon content (fhuminC) is proposed as an improved parameter for evaluating the potential for POP accumulation in soils, replacing total organic carbon (foc). Congener studies revealed that penta- and hexa-substituted-CBs show the optimal combination of physicochemical properties for equilibrating with the humin content in soil. Moreover, fhuminC/foc is conceptually equivalent to the empirical coefficients used in predictive Ksa equations. In our samples, the fhuminC/foc was 0.55, a value in between the empirical coefficients proposed in the literature. In predictive equations, the use of fhuminC instead foc avoids the necessity of using an empirical parameter for a ‘generic’ condition by introducing an experimental parameter (fhuminC) that takes into account a local conditions (organic matter composition)
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
Dispelling the Myths Behind First-author Citation Counts
Full text linkWe 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
koamabayili/VECTRON-author-checklist: VECTRON author checklist
No full textWe have done our best to complete the author checklist relating to the use of animals in the hut study. Note that the objective for the hut study was to evaluate the IRS treatment applications for residual efficacy against Anopheles mosquitoes, including the local An. coluzzii mosquito population. Cows were only used to attract mosquitoes into the huts and no tests were carried out directly on the cows. The author checklist is intended for use with studies where experiments are carried out on animals, which is why we have had such difficulty in completing this for the hut study, as many of the questions do not relate to how the cows were used
Author-wise bibliometric analysis based on entropy.
No full textAuthor-wise bibliometric analysis based on entropy.</p
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