1,720,979 research outputs found
Relationship between microstructure, mechanical and magnetic properties of pure iron produced by laser powder bed fusion (L-PBF) in the as-built and stress relieved conditions
Full text linkIn the present work, the mechanical and magnetic properties of pure iron manufactured by laser-powder bed fusion (L-PBF) were investigated both in the as-built (AB) and stress relieved (HT) conditions, with the aim of elucidating their relationship with the microstructure and evaluating whether and to what extent it can be suitable for industrial applications. The L-PBF process was optimized to obtain high density, crack-free components. Specimens for microstructural analyses, tensile and magnetic tests were manufactured under the optimized conditions and tested both in the as-built and annealed (850 degrees C for 1 h, to relieve the residual stresses) conditions. Tensile tests showed high tensile strength in both AB and HT conditions (larger than those of conventionally produced pure iron), with higher ductility and lower strength after stress relieving. The magnetic study indicated a not optimal magnetic softness although the heat treatment enhanced the permeability and reduced the coercivity with respect to the as-built condition. The high mechanical strength and low magnetic softness came from the very fine grain size (about 5 mu m) of L-PBF pure iron. Instead, the improvement of magnetic softness and ductility after heat treatment was attributed to the possible reduction of dislocation density and consequent stress relief. The results indicated the possibility to achieve a considerably high mechanical strength, in pure iron manufactured by L-PBF, although the fine grain size limits its magnetic softness
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
ESPERIENZE DI DIDATTICA DELLA FISICA IN DIVERSI LIVELLI DEL SISTEMA EDUCATIVO
No full textLa crescente partecipazione delle persone a eventi di divulgazione scientifica, i progetti sostenuti dal MIUR (http://www.progetto laureescientifiche.eu; http://hubmiur.pubblica.istruzione.it/web/ricerca/dif fusione) per promuovere l’insegnamento delle materie STEM (Science, Technology, Engineering, Mathematics) nei diversi livelli del sistema educativo e l’introduzione di argomenti di fisica moderna e contemporanea nelle programmazioni di alcuni Licei (http://www.indire.it/ lucabas/lkmw_file /licei2010///indicazioni_nuovo_impaginato/_Liceo%20scientifico%20opzione %20Scienze%20Applicate .pdf) hanno contribuito, in molti casi, a rafforzare il legame tra scuola, Università e centri di ricerca. Questo legame si è concretizzato nell’istituzione di attività dedicate in cui è stato necessario impiegare metodologie comunicative e didattiche sempre più efficaci. L’articolo presenta lo spettro delle attività realizzate negli ultimi tre anni, a partire dall’anno accademico 2015/2016, dall’Università di Ferrara e dall’Istituto Nazionale di Fisica Nucleare per la comunicazione e la didattica della fisica. Verranno analizzati alcuni casi studio che si differenziano per contenuti, destinatari, contesti e strategie didattiche. In particolare verranno prese in esame le attività dedicate all’insegnamento della fisica moderna e contemporanea condotte con gli allievi delle scuole secondarie di II grado (http://www.fe. infn.it/ orientamento_fisica/courses/laboratori-di-fisica-moderna/), i laboratori scientifici hands-on realizzati con gli allievi delle scuole primarie e un’esperienza di didattica museale inserita in una mostra di storia della fisica dedicata al binomio arte-scienza (www.fe.infn.it/fisicaeme tafisica). Il primo è un caso di out-of-school learning in cui gli allievi delle scuole secondarie di II grado lavorano in gruppo a fianco dei ricercatori, per realizzare un esperimento di fisica moderna, e una volta tornati in classe devono relazionare ai pari quanto svolto e appreso durante l’attività laboratoriale. Nel secondo caso, gli allievi delle scuole primarie sono chiamati a condurre esperimenti guidati per acquisire familiarità con il metodo scientifico, investigando alcuni fenomeni fisici presenti nel quotidiano. Nell’ultimo caso, alcune scoperte della fisica moderna vengono introdotte dalla corrispondenza tra opere d’arte e strumenti scientifici e collegate alla storia di Ferrara
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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