1,721,006 research outputs found
Effect of aggregate size and inclusion of polypropylene and steel fibers on explosive spalling and pore pressure in ultra-high-performance concrete (UHPC) at elevated temperature
No full textThis paper investigates the individual and combined effects of polypropylene (PP) fibers, steel fibers, and aggregate size on spalling behavior and pore pressure build-up of ultra-high-performance concrete (UHPC) exposed to elevated temperature. Simultaneous measurements of pore pressure and temperature were conducted at different depths in UHPC specimens under one-sided heating with a heating rate of 2 °C/min. Compressive, tensile, and permeability tests were performed to analyze spalling behavior. Addition of PP fibers fully prevented spalling and they are much more effective in increasing permeability than steel fibers and larger aggregates. The combined use of PP and steel fibers, and PP fibers and larger aggregates showed strong synergistic effect on increasing permeability. The higher the permeability, the lower was the maximum pore pressure measured in the samples. Two plateaus were observed from the temperature history due to vaporization of liquid water (between 115 and 125 °C inside the specimens) and release of water vapor (starting from 180 °C), respectively. The second plateau was identified as the functional temperature of PP fibers. Maximum pore pressures in spalled specimens were much lower than their tensile strengths, which could imply the contribution of hydraulic pressure in the region of moisture clog on spalling.National Research Foundation (NRF)This material is based on research/work supported by the Land and Liveability National Innovation Challenge under L2 NIC Award No. L2NICCFP1-2013-4. The authors thankfully acknowledge the support received from Dr. Jihad MIAH, Dr. Romain MEGE, and Mr. Pierre-Jean DEGIOVANNI during the experiments at CSTB
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
Distribution of forces on fasteners in light cladding systems under in-plane seismic actions
No full textLAUREA MAGISTRALELo studio del comportamento sismico degli elementi non strutturali è un argomento
di grande rilevanza e attualità per la ricerca scientifica nell’ambito dell’ingegneria strutturale; tali elementi in passato erano infatti considerati come semplici carichi
agenti sulla struttura principale mentre in realtà sono soggetti ad eccitazioni sismiche
addirittura superiori rispetto alla struttura principale in quanto risultano essere amplificate da quest’ultima.
Grande importanza rivestono dunque gli elementi di fissaggio che devono essere
adeguatamente progettati per trasferire le azioni alla struttura principale.
Il comportamento dei sistemi di facciate leggere viene studiato attraverso una serie
di test in scala reale, dove vengono applicate azioni sismiche simulate per valutare il comportamento globale del sistema, e di test in scala ridotta sui singoli elementi di
fissaggio per valutare i meccanismi di trasmissione del carico negli ancoraggi.
In particolare, vengono indagati gli effetti associati all’installazione in diversi materiali di base e all’utilizzo di diversi angolari di supporto.
Dai risultati sperimentali è stato possibile definire dei modelli analitici semplificati
per valutare il comportamento di una sistema di facciate in fase di progetto stimando le azioni agenti sui singoli ancoraggi.
I dati sperimentali sono stati dunque confrontati con i risulti ottenuti attraverso
i modelli analitici definiti in precedenza e quelli proposti da alcuni testi normativi
per la definizione delle azioni sismiche e la progettazione di facciate ed elementi non
strutturali.
Si è infine valutato come un fattore di comportamento inferiore rispetto a quello proposto dalle normative risulterebbe più adeguato per rappresentare il comportamento
di sistemi di facciate.Behavior of non structural elements subjected to seismic action is a great relevance topic in structural engineering research nowadays; in fact, these elements are subjected to the same dynamic excitation of bearing parts of structure.
In particular, the connection between structural and non structural parts of the
structure plays a critical role on safety of both elements; a safe design of the
connections is essential to ensure an adequate level of safety for the expected actions during a seismic event.
Cladding systems are analyzed through experimental tests performed both at real
scale under simulated seismic loads and at fixing points local level, in order study
the load transfer mechanism to the fasteners.
In particular, the effects of different fixing points configurations are studied, considering different base materials, commonly used in real building application, and different supporting angle brackets; in addition, resonant behavior of façade system
is studied on an specifically design cladding configuration.
From experimental results analyses, models are defined in order to predict the
behavior of façade system and evaluate seismic forces acting on fixing anchors.
Finally, experimental data are compared with analytical results obtained with the
defined models and building codes prescription for design of façade system; it is shown that a low behavior factor may be more suitable for represent the façade
behavior and evaluate design seismic action
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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