1,720,968 research outputs found
Comportamento meccanico di giunzioni speciali per strutture di alluminio: sperimentazione e modellazione
No full textLa possibilità di ottenere attraverso il processo di estrusione profili dalla sezione personalizzata permette di concepire nuovi sistemi per il collegamento tra profili di alluminio, noti come giunzioni speciali. Infatti, è possibile ottenere sezioni dotate di scanalature e guide al cui in-terno possono disporsi organi meccanici di collegamento come viti e bulloni. Tali sistemi ri-sultano particolarmente competitivi rispetto alle soluzioni tradizionali in quanto comportano diversi vantaggi come la rapidità di esecuzione, il risparmio del materiale di base e la riduzione delle lavorazioni meccaniche. Nonostante i numerosi impieghi strutturali e il crescente interesse da parte dell'industria dell'alluminio dovuto ai vantaggi legati al loro utilizzo, le principali normative in materia non forniscono informazioni sulla progettazione di tali sistemi di giunzione. Per tale motivo, è stata pianificata una vasta campagna sperimentale finalizzata alla caratterizzare la risposta strutturale dei sistemi noti come screw-groove e bolt-channel. In aggiunta, sulla base dei risultati sperimentali sono sviluppati e calibrati modelli numerici non lineari che rappresentano uno strumento di analisi avente validità più generale
Development and Calibration of Hysteretic Model for CFS Strap braced stud walls
No full textCold-formed steel (CFS) members in buildings are in use for decades, but their earthquake performance remained unexplored, until recently. Eurocodes, which provide common approach for the design of buildings in Europe still lack the information on seismic design of CFS structures. However, for the last few years, University of Naples “Federico II” CFS research group is dedicated in investigating their seismic performance. One of the focus areas is characterizing seismic behaviour of CFS strap braced stud walls. This paper presents a generalized approach adopted in simulating hysteretic behaviour of these walls under cyclic load in OpenSees software. Numerical models are developed and calibrated on the basis of available experimental results
Going Beyond Counting First Authors in Author Co-citation Analysis
Get PDFThe 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
Concentric braced frames: global and local numerical studies on the seismic behaviour of steel multistory bracing systems by refined FEM analyses
No full textVariations on the Author
Get PDF“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
The Functional-Structural Rehabilitation of the Prince Caracciolo of Avellino Building Located in the Old Town of Naples “UNESCO World Heritage Site”
No full textThe paper presents the functional and structural rehabilitation of an historical masonry building located in the old town of Naples, which is an UNESCO World Heritage Site. The building was initially built in the 16th century as monastery and in the 17th century it was achieved by the Prince Caracciolo of Avellino family, who made major modifications. The building has a rectangular plan with a length of about 50 m and width of about 10 m. It has 6 stories, one of which is below the street level; the pitched roof reaches a maximum height of about 26 m. Before the renovation intervention the building was very much degraded, presenting widespread cracks in the masonry walls and vaults and deteriorated wooden floors. The rehabilitation was dedicated on one hand to the retrofit of existing vertical and horizontal structures, on the other hand to adapt the building to the new use, as a Foundation of Contemporary Art. The paper briefly describes the state of the construction before the intervention and its recovery and transformation, with particular reference to the structural aspects
Appropriate Similarity Measures for Author Cocitation Analysis
Get PDFWe 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
Get PDFWe 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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