1,721,009 research outputs found
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
“L’armonia delle diversità”. Educazione musicale interculturale nella scuola dell’infanzia
No full textLa sfida educativa dell’Intercultura nella Scuola richiede ai docenti di fondare sempre più incisivamente le metodologie sulla comunicazione, la cooperazione e la partecipazione degli studenti per favorire l’incontro di tutte le culture presenti in classe. In questo contributo, viene riportata una esemplificazione di attività didattica per offrire ai bambini e alle bambine che frequentano la scuola dell'infanzia gli strumenti di base per comprendere e apprezzare il macrocosmo delle diversità
Oxidation-induced fragmentation of carbonaceous materials at low and intermediate temperatures
No full textOxidation of carbonaceous materials in flames is a key phenomenon in determining the final emission of these compounds in the atmosphere both in terms of concentrations and particle sizes. Oxidation is generally considered as a surface process able to subtract carbon atoms from the particles reducing their size. However, fragmentation of particles can also occur if the oxidizing species is able to penetrate the particles and remove C atoms from weak points causing the break-up of the particles. This process can be referred to as oxidation - induced fragmentation and can be seen as particular events of oxidation. It produces a huge number of very small size particles increasing their subsequent burn-out. Recent experimental data obtained in flames have shown the importance of oxidation-induced fragmentation and have individuate O 2 as the main responsible for particle fragmentation because of its relatively slow oxidation rate and the capability to penetrate the particles. Fragmentation can involve large aggregates containing a large number of individual particles leading to smaller aggregates, but also primary particles where internal burning fragments single particle into smaller clusters. In order to have more insights on the process of oxidation - induced fragmentation of soot, the oxidation of various carbonaceous materials has been carried out in a quartz tubular flow micro reactor electrically heated to controlled temperatures ranging from 800 to 1300K. Continuous analysis of CO and CO 2 concentrations allowed the evaluation of carbon conversion at varying temperatures and material characteristics. Measurements of specific surface area of the fresh carbon materials and of the samples after partial carbon conversion have also been carried out. Results showed a huge increase of the specific surface area as the carbon conversion proceeds. The increase was more evident in the low temperature range where the specific surface area was increased up to 800%. Analysis of the data have shown that fragmentation of the particles occurs particularly at lower temperatures where molecular oxygen is able to penetrate the pores to internally oxidize the particle causing their break-up. A fragmentation kinetic constant has been retrieved from the experimental data and compared with literature data
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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