1,721,490 research outputs found
Transfer-matrix approach to computer simulation of impedance spectroscopy of hydrating cement paste
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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
Evaluation of Net Energy Obtainable from Combustion of Stabilised Olive Mill By-Products
No full textThis work is aimed at calculating the energy content of the residues from olive oil
production. Olive pulp, olive husk and sludge (a mixture of olive pulp and husk) have been
analyzed separately. Olive Mill Effluents (OME) are normally a problem for olive mill
farms, yet they may be used as feedstock for biomass-fuelled power plants. Nonetheless,
OMEs are characterized by a relatively high humidity content and are produced only during
the olive season. Thus, OME need a stabilization process to be employed as a solid biofuel
throughout the year. The analyses conducted attempt an evaluation of the energy
consumption of a three-stage stabilization process: drying, milling and pelletising. The net
electrical energy available from OME is then calculated as a difference between gross
energy available and energy consumed for stabilization. The gross available electrical
energy was calculated based on direct energy conversion of the stabilized feedstock on a
small scale direct combustion and Organic Rankine Cycle (ORC) turbine. Results show that
OME are suitable for energy production. Approximately 4500 kJ/kg of net electrical energy
may be obtained out of olive sludge or olive pulp, while olive husk shows a potential gross
energy of 3400 kJ/kg
Caratterizzazione delle malte impiegate nell’apparecchio murario aquilano: la chiesa di S. Silvestro a L’Aquila
No full textL’architettura religiosa aquilana riveste, sia per il suo valore storico artistico, che per la quantità di edifici, una grande rilevanza] e la sua conservazione pone rilevanti problemi di ordine metodologico ed economico. Intorno al XIII- XIV secolo si registra la costruzione di edifici civili e religiosi realizzati con superfici a facciavista con conci squadrati e regolari disposti secondo ricorsi orizzontali e sfalsati tra loro.
Scopo del presente lavoro è quello di definire un criterio per la descrizione dell’ama ed analizzare le caratteristiche delle malte impiegate nei paramenti laterali della chiesa di San Silvestro, correlandole con i fattori e i meccanismi di degrado. Tale studio potrà fornire, inoltre, elementi utili alla comprensione del comportamento strutturale delle murature stess
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