1,723,758 research outputs found
Environmental impact of abandoned mine waste: a review.
No full textSince the dawn of civilization until the last decades of the past century, mining activity, especially that concerning base and precious metals, represented a resource for human population, owing to its importance in many fields of interest. By the second half of the last century, however, mining activity declined until final closure in the face of developing countries, owing to decreasing mineral resources and to metal price drop. In this book, the effects of former mine activities and the related environmental problems are discussed, with the ultimate goal of investigating the fate of potentially toxic elements in the environment and their impact on the conterminous land
Environmental impact of abandoned mine waste: a review.
No full textSince the dawn of civilization until the last decades of the past century, mining activity, especially that concerning base and precious metals, represented a resource for human population, owing to its importance in many fields of interest. By the second half of the last century, however, mining activity declined until final closure in the face of developing countries, owing to decreasing mineral resources and to metal price drop. In this book, the effects of former mine activities and the related environmental problems are discussed, with the ultimate goal of investigating the fate of potentially toxic elements in the environment and their impact on the conterminous land
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
Heavy-light decay topologies as a new strategy to discover a heavy gluon
No full textWe study the collider phenomenology of the lightest Kaluza-Klein excitation of the gluon, G*, in theories with a warped extra dimension. We do so by means of a two-site effective lagrangian which includes only the lowest-lying spin-1 and spin-1/2 resonances. We point out the importance of the decays of G* to one SM plus one heavy fermion, that were overlooked in the previous literature. It turns out that, when kinematically allowed, such heavy-light decays are powerful channels for discovering the G*. In particular, we present a parton-level Montecarlo analysis of the final state Wtb that follows from the decay of G* to one SM top or bottom quark plus its heavy partner. We find that at √s = 7 TeV and with 10fb -1 of integrated luminosity, the LHC can discover a KK gluon with mass in the range MG* = (1.8 - 2.2) TeV if its coupling to a pair of light quarks is gG*qq - = (0.2 - 0.5)g3. The same process is also competitive for the discovery of the top and bottom partners as well. We find, for example, that the LHC at √s = 7 TeV can discover a 1TeV KK bottom quark with an integrated luminosity of (5.3 - 0.61) fb -1 for gG*qq - = (0.2 - 0.5)53. © SISSA 2012
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
Measuring the phase of the strong decay amplitudes
No full textIt is shown that the interference between --> J/psi --> e(+)e(-) and --> e(+)e(-) can be measured with good accuracy at Fermilab. Therefore the phase of the strong decay amplitude of the J/psi with respect to the proton magnetic form factor will be obtained. There are hints, from J/psi --> and other J/psi decays, of an unexpected similar to 90 degrees phase. (C) 1997 Published by Elsevier Science B.V
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
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