1,720,972 research outputs found
Characterization of fruit and vegetable wastes as a single substrate for the anaerobic digestion
No full textAnaerobic digestion of potato industry by-products on a pilot-scale plant under thermophilic conditions
No full textKinetics of Sulcis coal chemical cleaning process
No full textSulcis coal is a sub-bituminous coal from the Monte Sinni mine in the South West coast of Sardinia.
The ash content of this coal is about 15 wt % as received, whereas the sulphur content is 6-7 wt%
(inorganic sulphur is present at about 2-3 wt%). Since most of the pyritic sulphur is finely disseminated in crystals of micron or sub-micron size, the only remaining possibility of removing sulphur from this coal prior to its utilization is confined to chemical methods. The present work shows the results of the experimental testes which are conducted on Sulcis coal samples by sequential leaching of potassium hydroxide followed by hydrogen peroxide. Moreover, the present paper shows the kinetics of Sulcis coal leaching process. The high efficiency of sulphur reduction, on average about 30 %, was found to be of special technical relevance for relatively large particle sizes, <5.60 mm, said efficiency being obtained through tests carried out on different particle size classes of leached samples
Energy-oriented optimization of an anaerobic digestion plant for the combined treatment of solid and liquid wastes in a potato chips industrial plant
No full textPotato chips represent the main product of the snack food industry. Their processing determines the production of several kinds of wastes characterised by different physical and chemical properties that make them eligible feedstock for biological treatments. In this paper the anaerobic digestion of all the solid and liquid wastes, produced by a potato chips processing line and properly mixed, is investigated. The experiment hereby described is carried out on a pilot-scale plant and aims to reproduce the real situation of a potato chips factory by feeding all the wastes in the anaerobic reactor in a ratio suitable for an effective treatment process. A comparison between the performance of anaerobic digestion processes feed by raw potato wastes and balanced mixtures of all potato wastes deriving from potato chips processing lines is carried out. Finally, the results of the experimental investigation were used for a preliminary performance evaluation of a full-scale anaerobic digestion power plant for treating all the potato wastes produced by an industrial potato chips production plant
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
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