1,721,006 research outputs found
High performance computing applied to the seismic finite element analysis of an historic structure: the Temple of Athena in Paestum
Full text linkHistorical masonry structures constitute an extremely varied and complex set as far as building techniques. The analyses of their structural behaviour, when excited by a seismic event, are often affected by considerable uncertainty arising from the hypothetical definition of the mechanical properties of materials and of the constraint conditions between the elements.
The mechanical modelling of a historic building requires a knowledge of the properties of the various elements that make up the masonry and of the role they play: the masonry material, its use in the various components and, finally, how the connection between different elements are made in order to construct the building. The results of the work of modelling and the results of static and dynamic (seismic) analysis of the Temple of Athena, part of the broader site of monumental historical buildings in the Plain of Paestum, are presented in this paper.
This work is part of the research project "Costruito", carried out within the Istituto di Cibernetica "E. Caianiello" in Naples, which has, among its objectives, the purpose to define the main phases of the procedure that, starting from the identification of a historical building, ends with the determination of its structural behaviour in static and seismic phases.
The entire structure of the Temple of Athena has been modelled through a micro-modelling strategy in order to reproduce as faithfully as possible the whole geometry of the building. This approach has the disadvantage of being computationally expensive, given the large number of finite elements to be generated, but at the same time the merit of allowing, at a later stage, a more thorough validation and verification.
To face the high computational cost, particular attention was paid to the continuous verification in the modelling phase, through an accurate test quality of the meshed finite elements. The control of the characteristic length of each element has allowed a lower limit to the size of time step to be established and to contain within certain limits the duration of simulations.
With respect to this objective it has proved successful the choice of the modelling and pre-processing software, Hypermesh, that provides advanced features for the meshing procedure together with many effective testing tools.
The solver adopted for the simulation phase is Radioss, whose characteristics are well fit for the modelling of the contacts between surfaces (penalty based methods for the contact). A parallel version of this software (four CPUs) was used for the simulation on a vector parallel machine NEC Sx-8.
The results of simulation tests regarding static and seismic analysis are finally presented
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
Immunohistochemical detection of vasoactive intestinal polypeptide (VIP) in rabbit oviduct
No full textImmunohistochemical localization of VIP and Met-enkephalin in the rabbit submandibular and sublingual glands
No full textLe “sindoni” ricamate. Simbologia e iconologia dei veli liturgici nel rito bizantino
No full textI veli liturgici del rito bizantino (air, epitaphios, antiminsion), considerati nella loro valenza simbolica – testimoniata dagli antichi commentari liturigici – appaiono in relazione con il mistero della sepoltura del Cristo e considerati nel loro decoro figurativo nel appaiono in relazione con l’immagine impressa sul telo sindonico torinese
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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