1,720,959 research outputs found
Strain-controlled Biaxial Tests of Coated-Fabric Membranes
No full textA better understanding of the mechanical behaviour of coated fabrics used for architectural membranes can lead to significant improvements in the design of tensile surface structures.
The plane biaxial test on a cruciform specimen is considered to be the most appropriate test to characterise the complex non-linear behaviour of such membrane material. The biaxial tests described in the literature are usually carried out under prescribed stress histories at various, constant stress ratios.
The present contribution describes some strain-controlled biaxial tests carried out at Politecnico di Milano, in which the strains in the central square of the specimen are prescribed. Such tests can be particularly meaningful in relation to installation and re-tensioning processes. Since they imply a variable stress ratio, the results obtained by these non-traditional tests complement the ones of stress-controlled experiments.
It appears that these two types of biaxial tests can be exploited jointly in order to select and calibrate constitutive models for coated fabrics; these are needed for the overall modelling of tensile structures, with the aim of simulating both the response under external loadings and the installation process
Round-robin biaxial tensile testing of architectural coated fabrics
No full textThis paper describes the procedure followed for the preliminary determination of the precision of a typical commercial biaxial test usually required for the analysis and design of a membrane structure
An algorithm to draw simulations of dynamic lightweight structural systems with schemas
Full text linkArchitects, designers and structural engineers throughout their education and practice work mostly with visually controlled 3D modelling applications that require manually controlled actions to get the final desired model. On the contrary, we can see the development of visual programming that is now intertwined with traditional software applications and uses data flow to generate geometry. Professionals in the AEC industry witness the capabilities of visual programming mainly by means of its output and the live demonstration of scripts that automate the big amount of manual work. Notwithstanding the fact that visual programming is very appealing as an asset, acquiring the necessary skillset is often a matter of struggle. An example of this is the dynamic simulations of structural systems (tensile, bending active etc.). There are means to perform them but they usually require knowledge of visual programming and several frameworks. This paper attempts to introduce an open-source algorithm cutting short the intricate process of learning new non-conventional software and directly giving the opportunity to design dynamic structural systems as a schema and getting the instant simulations therein
Development and validation of an experimental methodology for the characterization and FEM analysis of fibre-reinforced architectural meshes
No full text
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
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