1,720,954 research outputs found
Going Beyond Counting First Authors in Author Co-citation Analysis
Get PDFThe 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
Get PDF“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
Get PDFWe 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
Insights in anaerobic co-digestion via experimental and dynamic modelling tools
Get PDFLAUREA MAGISTRALENel presente lavoro di tesi sono stati presentati i risultati di una sperimentazione su un impianto pilota di digestione anaerobica. La sperimentazione, durata 7 mesi, è stata effettuata prima sulla mono-digestione del fango prodotto da un impianto di trattamento acque reflue e successivamente sulla co-digestione con dello yogurt scaduto di note marche commerciali. Il reattore ha operato secondo un modello CSTR (Continuous Stirred Tank Reactor) e un volume operativo di 60L a una temperatura di 38±0.5 °C. Il pilota è stato alimentato giornalmente in modalità semi-continua operando con un HRT medio di 17 giorni. Nella fase di mono- digestione il reattore è stato sottoposto ad un OLR medio di 1.34 kgVS/m3/d. Tale OLR medio, nella fase di co-digestione, è stato incrementato del 20% tramite l’aggiunta di yogurt passando a 1.61 kgVS/m3/d. Lo scopo principale del presente lavoro è stato quello di sviluppare e calibrare un modello di co-digestione su base ADM1 attraverso la piattaforma di programmazione OpenModelica. La calibrazione è stata effettuata attraverso un processo iterativo di validazione con i dati analitici, i risultati delle prove di BMP e delle prove di attività della biomassa svolte. Il metodo di iterazione proposto per la calibrazione del modello è risultato essere efficace: il modello si adatta in maniera soddisfacente ai dati sperimentali raccolti nel corso di 7 mesi di operatività dell’impianto pilota, come avvalorato tramite gli indicatori statistici Theil’s Inequality Coefficient (TIC) e Mean Absolute Relative Error (MARE). Tra i vari risultati ottenuti, gli indicatori TIC e MARE per la simulazione della concentrazione dei VFA nel digestato sono rispettivamente 0.174 e 0.333 (per entrambi i criteri, più il valore si avvicina a zero, migliori sono le prestazioni del modello, TIC <0.3 rappresenta un buon risultato di simulazione). Per la simulazione della concentrazione dell’ammonio (NH4+) si ottengono valori di TIC = 0.081 e MARE = 0.167. Per la simulazione dei test di BMP in co-digestione si ottengono valori di TIC = 0.009 e MARE = 0.018.In the present thesis work, the results of experimentation on a pilot anaerobic digestion plant have been presented. The experiment, which lasted seven months, was carried out first on mono-digestion of the sludge produced by a wastewater treatment plant and subsequently on co-digestion with expired yogurt of well-known commercial brands. The reactor operated according to a Continuous Stirred Tank Reactor (CSTR) model and an operating volume of 60 L at a temperature of 38 ± 0.5 ° C. The pilot plant was fed daily in semi-continuous mode operating with an average HRT of 17 days. In the mono-digestion phase, the reactor was operating with an average OLR of 1.34 kgVS/m3/d. This average OLR, in the co-digestion phase, was increased by 20% to 1.61 kgVS/m3/d by adding yogurt. The main purpose of this work was to develop and calibrate a co-digestion model based on ADM1 through the OpenModelica programming platform. The calibration was carried out through an iterative validation process with the analytical data, the results of the BMP tests and the biomass activity tests carried out. The proposed iteration method for the model calibration was found to be effective: the model adapts satisfactorily to the experimental data collected, as confirmed by the statistical indicators Theil's Inequality Coefficient (TIC) and Mean Absolute Relative Error (MARE). Among the various results obtained, the TIC and MARE indicators for simulating the concentration of VFAs in the digestate are 0.174 and 0.333, respectively (for both criteria, the closer the value to zero, the better the model performance, TIC <0.3 represents a good simulation result). For the simulation of the ammonium concentration (NH4 +), values of TIC = 0.081 and MARE = 0.167 are obtained. For the simulation of the BMP tests in co-digestion, values of TIC = 0.009 and MARE = 0.018, are obtained
Dispelling the Myths Behind First-author Citation Counts
Get PDFWe 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
Author-wise bibliometric analysis based on entropy.
No full textAuthor-wise bibliometric analysis based on entropy.</p
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