1,720,964 research outputs found
Effects of deep excavation on seismic vulnerability of existing reinforced concrete framed structures
No full textIn this paper the effects of deep excavation on seismic vulnerability of existing buildings are investigated. It is well known that deep excavations induce significant changes both in stress and strain fields of the soil around them, causing a displacement field which can modify both the static and dynamic responses of existing buildings. A FEM model of a real case study, which takes into account geometry, non-linear soil behavior, live and dead loads, boundary conditions and soil–structure interaction, has been developed in order to estimate the soil displacements and their effects on seismic behavior of a reinforced concrete framed system close to deep excavation. Considering a significant accelerometric seismic input, the non-linear dynamic responses of the reinforced concrete framed structure, both in the pre and post-excavation configurations, have been evaluated and, then, compared to estimate the modification in seismic vulnerability, by means of different seismic damage indices and inter-story drifts
Optimal integrated design of structural and viscoelastic bracing-damper systems: theoretical principles
No full textPassive structural control techniques are generally used as seismic rehabilitation and retrofit methodologies of existing structures. An exciting consequence of structural seismic control research is that it opens the mind to new possibilities in structural forms and configurations, such as slender buildings or bridges with longer spans, without compromising on structural performance through an integrated design of systems. In this paper, with reference to the viscous or viscoelastic dampers, the possibility of achieving the seismic protection through the integration of the elastic lateral stiffness resources and the viscoelastic properties of a dissipative bracing-damper system is investigated. The innovative aspect consists of considering the viscoelastic damping resources as a design variable in order to control the dynamic response. It is thus proposed and developed an integrated design methodology to ensure a preassigned performance, within the displacement based design approach, which explicitly takes into account the dynamic behavior both of the structural and control systems. The optimal design criterion is defined by determining the combination of the variables which minimizes a total cost function. Application of the proposed design approach on a SDOF system is described to show its effectiveness
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
Variations 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
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
EFFETTI DI SCAVI PROFONDI SULLA RISPOSTA SISMICA DELL'EDIFICATO ADIACENTE
No full textSi esamina l'effetto di scavi profondi sulla risposta sismica dell'edificato adiacente. In particolare si studia la modificazione della vulnerabilità sismica dell'edificato esistente in seguito all'esecuzione di scavi profondi in aree adiacenti per la realizzazione di grandi opere sotterranee. E' noto infatti che l'esecuzione di scavi profondi comporta l'insorgere in superfice di un campo di spostamenti in grado di modificare l'assetto statico dell'edificato circostante. L'obiettivo dello studio è quello di valutare le eventuali variazioni di vulnerabilità sismica degli edifici esistenti per effetto di scavi posticipati rispetto alla loro edificazione. Si esamina un caso studio di interazione suolo-scavo-edificato, modellato in PLAXIS, analizzando in una prima fase gli effetti dei movimenti del suolo indotti dallo scavo su di un edificio e simulando la risposta non lineare ad una eccitazione sismica dello stesso edificio prima e dopo l'esecuzione dello scavo al fine di una valutazione comparativa della vulnerabilità sismica
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
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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