1,720,984 research outputs found
Effects of elevated temperatures and of loading procedures on the bond performance of reinforcement in concrete
Full text linkThe decay in the local bond performance of reinforcement bars in concrete due to exposure to high temperature is often investigated performing pull-out tests on steel rods embedded in the center of concrete specimens. The tests are generally performed in residual state i.e. upon cooling down to room temperature. However, this approach neglects not only the detrimental effects of the temperature on splitting strength of bond, but also the effects of the application of a sustained load during the heating phase, as in real applications. This paper investigates the bond performance between steel and concrete after exposure to high temperatures as a function of the rebar position, maximum exposure temperature and heating and loading sequences. Three different rebar positions are investigated, namely, rebar located in the center of the specimen (clear cover to both edges equal to 72mm), rebar at the edge (clear cover to closer edge 24mm and to the other edge 72mm), rebar at the corner (clear cover to both edges 24mm). Two different heating and loading sequences are considered. In a first series, the load is applied after cooling down of the specimen from the desired target temperature, while in a second series a constant load is applied prior to temperature increase. Results obtained through the two procedures are compared and discussed, also with respect to existing code provisions
Su alcuni aspetti teorico-sperimentali del getto termoconvettivo da forno elettrico ad arco
No full textIl lavoro riferisce sui risultati di un programma di ricerca sul fenomeno termoconvettivo che si instaurea al di sopra di un forno elettrico ad arco nelle fasi di caricamento del rottame diffondendo fumi e polveri in atmosfera.
Sono state formulate le relazioni, del tutto generali, che regolano le grandezze caratteristiche del fenomeno.
Queste ultime sono state determinate per via sperimentale su modello in scala, avvalendosi della teoria della similitudine.
Le ricerche operate su modello consentono di trasferire i risultati ottenuti sul prototipo industriale, oggetto delle ricerche, e sul quale verranno effettuate le misure di verifica e di conferma della validità della metodologia adottat
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
Author-wise bibliometric analysis based on entropy.
No full textAuthor-wise bibliometric analysis based on entropy.</p
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