1,720,986 research outputs found
Abandoned quarries surveying
No full textThe quarry activities are subjected in Italy to regional regulations that foresee the obligation to restore the site at the end of the activity. Nevertheless, since these regulations have been implemented after the 1980s, several quarries remain without any kind of restoration. However, such sites evolved naturally from a situation of not equilibrium with the surrounding ecosystem, toward a new situation of equilibrium through dynamic processes of soil formation and plants and animals colonization. The aim of this work is to point out a monitoring methodology in order to determine the state of restoration of abandoned quarries as to survey the land and its evolution in the time and, therefore, to program suitable restoration projects. The adopted monitoring methodology consists of remote-surveyed images, analyzed through GIS systems, and correlated with data collected in situ. The methodology has been applied to abandoned quarries in the Lazio region in Italy. The image analysis has allowed selecting two normalized artificial spectral fractions able to effectively discriminate the naked rock (initial state) from the undisturbed vegetation (final state), as well as the evolution from the initial state to another. Moreover, suitable indicators have been extracted for each quarry in order to describe the state of the situ-restoration and soil evolution. The state of restoration of the analyzed quarries results correlated to the value of the two select normalized artificial spectral fractions
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
Comparative LCA of fossil fuels and biofuels use for transportation – A literature review
Full text linkThis literature review investigates LCA studies carried out by different authors to evaluate the environmental impact of the use of traditional fossil fuels compared to the use of biofuels in the transport sector. The global warming potential of the studied fuels is analysed along with other impact categories such as acidification and human toxicity potentials. In general, biofuels are beneficial with respect to fossil fuels as regards greenhouse effect, since they are produced from vegetable systems that have assimilated CO2. However, the use of fertilizers and land areas, not needed for fossil fuels production, represent some of the main drawbacks of biodiesel and bioethanol life cycle. Both the similarities and differences among the results of the different LCA studies analysed are discussed in order both to highlight the most critical features that arise by comparing the environmental impact of traditional and alternative liquid fuels, and to assess if biofuels are an effective and sustainable alternative to diesel and gasoline for transportation in the next years
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
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