1,720,982 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
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
Modeling and simulation of propellant transfer phenomena in self-pressurizing propulsion systems
No full textLAUREA MAGISTRALEDurante l'ultimo decennio il successo dell'ossido di azoto è cresciuto nel campo spaziale poiché permette lo stoccaggio a temperatura ambiente, è facile da gestire, non è tossico e ha un'alta pressione di vapore. Quest'ultima caratteristica lo rende ideale per i sistemi Vapour Pressurization, VaPak. I sistemi auto-pressurizzati sono interessanti in quanto non richiedono pompe e sistemi di pressurizzazione esterni, riducendo così la complessità, il costo e il peso del sistema propulsivo. Durante lo svuotamento di un serbatoio contenente ossido di azoto si verificano fenomeni come la transizione di fase e la trasmissione di calore tra il liquido e il vapore. Da questi aspetti è influenzata la modellazione che descrive l'evoluzione nel tempo della pressione nel serbatoio e la portata massica uscente dal serbatoio. In questa tesi, sono stati implementati e comparati due modelli per descrivere la dinamica del serbatoio di un propellente auto-pressurizzante, considerando anche il riscaldamento del serbatoio dovuto ad una sorgente esterna. Il primo modello si basa sull'assunzione dell'equilibrio di fase tra liquido e vapore, mentre il secondo utilizza l'equazione di stato di Peng-Robinson. Inoltre, è stato studiato un design concettuale del trasferimento di ossido di azoto che sfrutta la differenza di pressione tra due serbatoi. La pressione di vapore è fortemente influenzata dalla temperatura, per questo motivo una fonte di calore esterna può essere usata per mantenere un propellente auto-pressurizzante alla pressione operativa senza l'uso di dispositivi aggiuntivi, permettendo così la gestione del propellente con importanti semplificazioni del sistema e riduzione della massa. Il lavoro include inoltre la proposta di un test per la verifica sperimentale del modello implementato per l'analisi di trasferimento del propellente.Nitrous oxide has gained popularity as propellant in the space field during the last decade because it is storable at room temperature, easy to handle and non-toxic. Due to its high vapour pressure, it can be exploited in Vapour Pressurization, VaPak, systems. Self-pressurizing propulsion systems are interesting since they do not require any pump and external pressurization system, reducing complexity, cost and weight of propulsion system. Phenomena such as phase transition and heat transfer between liquid and vapour occur during a discharge process of nitrous oxide from
a tank. Modeling of these aspects influences how accurately the pressure history in the tank and the mass flow rate out of the tank can be predicted. In this thesis, two models of a self-pressurizing oxidizer tank dynamics have been implemented, described and compared, considering also the heating of the tank due to an external heat source. One model is based on the phase equilibrium assumption between liquid and vapour and the second model utilizes the non-ideal Peng-Robinson equation of state. Moreover, a conceptual design of nitrous oxide transfer exploiting the vapour pressure difference between the donor and the receiving tanks has been studied. Due to strong dependence of vapour pressure on temperature, an external heat source can be used to maintain a self-pressurized propellant at the working pressure without the use
of additional equipment. In this way, the propellant management is implemented with important simplification of the system and saving mass. The work also includes the proposal of a test in order to validate the predictions of the model implemented for the propellant transfer analysis
Author-wise bibliometric analysis based on entropy.
No full textAuthor-wise bibliometric analysis based on entropy.</p
Computational Methods in Nuclear Radiation Shielding and Dosimetry
Full text linkoai:ojs2.jpr.vyomhansjournals.com:article/1The book is a comprehensive guide to the application of computational methods in the field of nuclear radiation shielding and dosimetry. The book covers a wide range of topics, from basic principles to advanced techniques, making it an ideal resource for both students and professionals in the field
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