1,721,139 research outputs found
Experimental and analytical studies for the choice of repair techniques applied to historic buildings
No full textA study concerning the application of different repair techniques on damaged historic masonry buildings is presented. In particular, three techniques are considered: injections, jacketing, and repointing of bed Joints reinforced by stainless steel wires.
The results of an experimental research carried out in the last years on some study cases are shown. Laboratory and in situ tests are included and the interpretation of the mechanisms of failure by mechanical and numerical models is also given
Mechanical behavior of historic masonry structures strengthened by bed joints structural repointing
No full textA study on mechanical behaviour of brick masonry structures subjected to overloading phenomena is here presented. Such structures suffer a very specific damage, represented by diffused thin cracks, which can lead to long terms effects up to a sudden collapse. A strengthening technique, based on the insertion of steel bars in the bed joints is proposed. Experimental tests and numerical analyses showed that the presence of the bars allows control of the cracking phenomena, keeping the structure in the desired safety conditions. Two case studies, recently carried out by the Polytechnic of Milan on masonry towers are also discussed. Finally, the application of the strengthening technique to two masonry churches is briefly describe
Il restauro del campanile del Duomo di Monza: scelte di progetto e tecniche d’intervento
No full textIl campanile del Duomo di Monza è stato oggetto, recentemente, di approfondite indagini (Binda, Poggi et al., 2001), promosse per valutare le condizioni di stabilità della torre in vista di un generale intervento conservativo. Tali indagini hanno evidenziato la presenza di fenomeni di dissesto - soprattutto quelli legati alle caratteristiche e al comportamento locale dei materiali – molto gravi.
È stato di conseguenza attivato un articolato processo conoscitivo e decisionale per definire, attraverso successive fasi di progressivo affinamento, un progetto di consolidamento mirato all’uso minimo delle tecniche più adeguate (sia tradizionali che innovative) ad affrontare i singoli aspetti della sicurezza strutturale inizialmente evidenziati e successivamente approfonditi con analisi e indagini sperimentali in sito e in laboratorio, tuttavia sempre nel rispetto dell’esistente.
Nel presente lavoro sono sinteticamente presentate la principali fasi di evoluzione del progetto di intervento, oltre che le soluzioni costruttive e tecnologiche adottate, facendo cenno anche all’intenso dibattito che ha accompagnato lo sviluppo del progetto su aspetti cruciali del difficile rapporto sicurezza strutturale/conservazione
Experimental studies for the choice of repair techniques applied to historic buildings
No full textA study concerning the application of different repair techniques on damaged historic masonry buildings is presented. Three techniques are considered: grouting by injection, jacketing, and the repointing of bed joints reinforced by the insertion of stainless steel wires.
The results of an experimental research carried out in the last years on some study cases are shown: both laboratory and in situ tests are included and the interpretation of the mechanisms of failure by mechanical and numerical models is also given
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
Novel monomers with N-methyl-D-glucamine segments and their application in structured porous materials for arsenic capture
Full text linkThe N-methyl-D-glucamine moieties exhibit high ability and selectivity toward arsenate ions in water by a complexation mechanism that involves their hydroxyl groups. In this work, the syntheses of two monomers containing N-methyl-D-glucamine, namely 4-vinylbenzyl-N-methyl-D-glucamine (VbNMDG), and N-methyl-D-glucamine methacrylamide (MNMDG) were studied. Different synthetic routes were considered in order to obtain liquid monomers able to polymerize and selectively capture arsenic. Furthermore, the incorporation of protective groups like trimethylsilyl moieties in the molecular structure was assessed to prevent transfer reactions during further polymerization. After polymerization, hydroxyl groups were deprotected using hydrofluoric acid. Following this methodology, structured microporous polymeric films based on colloidal crystal templates were prepared. NMR and FTIR techniques were used to follow the reactions and to determine the chemical structure of the obtained products. The morphology of materials was characterized by SEM. The performances of the developed polymeric films to selectively capture arsenic were determined. Films showed an improved and reproducible sensitivity to arsenic detection exhibiting high values of arsenic capturing capability (around 90%)
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