1,720,955 research outputs found
Performance meccaniche, potenzialità e criticità strutturali del calcestruzzo stampato 3D.
Full text linkIl 3DPC è un processo, strato su strato, in cui la malta cementizia estrusa attraverso un ugello segue un circuito predeterminato. Data la non omogeneità dell’elemento finito, questo nuovo processo necessita approfondimenti dal punto di vista meccanico e normativo. L'obiettivo di questa tesi di ricerca è studiare le azioni a compressione, flessione e taglio dei provini realizzati per indagare le performance meccaniche, le potenzialità e le criticità strutturali del calcestruzzo stampato 3D. Durante il periodo di ricerca sono state approfondite varie tematiche che vanno dalla storia della stampa 3D e le evoluzioni recenti, ai vari approfondimenti in ambito ingegneristico. Proprio in quest’ottica, durante la ricerca, il percorso di studio ha affrontato il tema delle criticità strutturali del calcestruzzo realizzato mediante questa tecnica innovativa. La malta cementizia scelta è priva di fibre e rinforzi in acciaio e i provini testati sono realizzati mediante tre tipi di stampa: provini realizzati mediante un processo di stampa continuo, provini che hanno avuto un intervallo temporale di un'ora tra il secondo e il terzo strato e provini che, all’intervallo temporale, è stata aggiunta una speciale malta additivata utilizzata per le riprese del getto. Per indagare le deformazioni intrinseche ed estrinseche del materiale durante i test, sono stati applicati strain-gauges e trasduttori a filo e, dai risultati ottenuti tramite i test, emergono differenze tra le singole tipologie di provini. I risultati estrapolati dai test distruttivi sono stati comparati dai risultati estrapolati da modellazioni FEM tramite l’utilizzo del software Ansys, dalla normativa vigente e da risultati di test presenti nella bibliografia contemporanea. La ricerca si chiude con un’analisi visiva anche sulle potenzialità e criticità del calcestruzzo stampato 3D mettendo in luce le variabili di viscosità delle malte cementizie e mettendo in luce il tema della coesione tra gli strati stampati.Italian
Un progettista metropolitano. Eugenio Miozzi, Venezia tra innovazione e tradizione 1931-1969.
No full textLa mostra, promossa dall'Archivio Progetti Iuav e dalla Scuola di Dottorato Iuav, si è tenuta dal 4 all'11 maggio 2022 presso la Biblioteca dei Tolentini dell'Università Iuav di Venezia. La presentazione si è tenuta il 5.5.2022 presso la Biblioteca , sala gradoni
Detection of 2009 L'Aquila Earthquake Effects on Collemaggio Church through Experimental Surveys
No full textTen years after the earthquake that affected central Italy in 2009, noninvasive investigations were carried out in L’Aquila on the Basilica of Santa Maria di Collemaggio. These were conducted to characterize the ground from a site-response point of view. The study consisted of 11 ambient noise recordings using the Nakamura technique and distributed along two profiles: one longitudinal to the central nave and one transverse. Analyzing the results, it was possible to determine the frequency of the vibration of the ground. After comparison with data from previous literature, it was possible to graph the contrasting sections of the impedance of the subsoil up to about 300 m depth (bedrock) drawing on a passive seismic survey from the single station. Furthermore, sonic tests were performed on the 14 octagonal columns of the central nave. The data were compared with those collected 10 years earlier (post earthquake) and with postearthquake structural restorations. The new tests show an increase of velocity in the resistant sections of the pillars subjected to the structural consolidation
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
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
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