1,720,954 research outputs found
Influence of the rocking behavior of shearwalls on the fundamental period of CLT structures
No full textThe comparison of results obtained from on-site modal tests and numerical analyses presented in recent studies showed that Cross Laminated Timber (CLT) buildings may exhibit a significant shift of fundamental period from the condition when rocking does not occur to the condition which the shearwall rocking is activated for. The objective of the current study is to establish a relationship between the fundamental period of CLT structures and the lateral drift of their global dynamic response. The influence of the activation of rocking behavior on the fundamental period was investigated by using experimental modal testing and Finite Element (FE) numerical analyses. The results from an experimental campaign were adopted to validate an FE numerical model used to perform an extended parametric analysis. The shift of the fundamental period from the value of period representing the condition for which the rocking of shearwall does not occur is investigated via elastic nonlinear incremental dynamic analyses. The effects of vertical load, stiffness, and yield displacement of mechanical anchors and geometrical dimensions of CLT shearwalls are analyzed and discussed. An analytical expression to predict the maximum range of fundamental period which a CLT shearwall may exhibit under different levels of the dynamic lateral response is reported as a function of the vertical load and the equivalent rocking slenderness
Edifici multipiano con struttura portante in pannelli CLT: tecnologie realizzative e strategie di progettazione
No full textNegli ultimi anni si è assistito ad un significativo aumento dell’utilizzo di pannelli di legno ingegnerizzato a strati
incrociati tipo CLT (Crossd Laminated Timber) per la realizzazione di edifici multipiano anche in zone ad elevata
sismicità. Tale sviluppo è riconducibile principalmente ai numerosi pregi del materiale legno ingegnerizzato, tra tutti la
sostenibilità, la prefabbricazione, la leggerezza e le ottime proprietà meccaniche del pannello ligneo.
Negli edifici multipiano in CLT, i sistemi di connessione impiegati per resistere alle sollecitazioni di trazione alla base
indotte dai meccanismi di ribaltamento delle pareti controventanti governano sia la rigidezza che la resistenza ad azioni
orizzontali del sistema strutturale. Tale problematica risulta particolarmente significativa per i sistemi strutturali a lame
isolate per le quali si riscontra una concentrazione locale di sollecitazioni di trazione sulle connessioni di base in quanto
l’effetto stabilizzante dei carichi verticali risulta modesto e a volte addirittura trascurabile.
Lo scopo del presente lavoro è quello di approfondire le problematiche sopra descritte sintetizzando i risultati dei
principali studi scientifici condotti sul tema e riportando alcune esperienze di progettazione significative. Con riferimento
al problema della localizzazione delle forze di trazione sulle connessioni alla base si analizzano delle soluzioni
tecnologiche alternative alle connessioni standard tipo Hold-down tra le quali le più promettenti risultano essere quelle
che prevedono l’impiego di sistemi del tipo Tie-down. I temi sopra descritti verranno approfonditi anche con riferimento
alle tematiche della corretta modellazione strutturale e specificati nell’ambito di un caso di studio significativo di edificio
multipian
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
Author-wise bibliometric analysis based on entropy.
No full textAuthor-wise bibliometric analysis based on entropy.</p
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