1,721,356 research outputs found
The effect of a shear bond in the Rankine method for the fire resistance of RC columns
No full textThe Rankine formula has been adopted by many natural codes for designing columns and frames at ambient temperature. The method had recently been adapted for structural fire resistance prediction by Tan and co-workers [Tang CY, Tan KH. Basis and application of a simple interaction formula for steel frames under fire conditions. J Struct Engrg ASCE 2001;127(10):1206-13; Tang CY, Tan KH, Ting SK. Basis and application of a simple interaction formula for steel columns under fire conditions. J Struct Engrg ASCE 2001;127(10): 1214-20; Tan KH, Tang CY. Interaction formula for reinforced concrete columns in fire conditions. ACI Struct J 2004;101(1):19-28; Tan KH, Tang CY. Interaction model for unprotected concrete filled steel columns under standard fire conditions. J Struct Eng 2004;130:1405-13]. The conventional Rankine method considers a linear interaction of two failure modes: plastic squashing and linear elastic buckling, ignoring the coupling interaction between the two modes. Consequently, the conventional method gives lower bounds to actual failure loads. This paper discusses the physical meanings of the Rankine approach and the effect of coupling interaction (termed "shear bond" for consistency with our earlier publications) between the collapse modes on the ultimate failure load. The purpose is to demonstrate that the Rankine method is a conservative, robust, and rational method for the structural design of columns under either ambient or elevated temperatures. The approach can be further adapted to provide more accurate failure load predictions by incorporating the shear bond effect into the Rankine formula. Material deterioration at elevated temperature and the resulting effects on the strength and stability of columns are also quantified. A computer code (SAFIR), developed at the University of Liege, was used to calibrate the modified Rankine method. © 2008 Elsevier Ltd. All rights reserved.link_to_subscribed_fulltex
Synthesis of hollow silica spheres with mesostructured shell using cationic-anionic-neutral block copolymer ternary surfactants
No full textMesoporous silica platelets with perpendicular nanochannels via a ternary surfactant system
No full textMicrosatellite DNA markers for population-genetic studies of blue mackerel (Scomber australasicus) and cross-specific amplication in S. japonicus
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Beauvericin activates Ca2+-activated Cl- currents and induces cell deaths in Xenopus oocytes via influx of extracellular Ca2+.
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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
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