1,720,964 research outputs found
FATICA HCF SU UN VIADOTTO A TRAVATA CONTINUA /
No full textFATICA HCF SU UN VIADOTTO A TRAVATA CONTINUA CON METODO DI CALCOLO CHE TIENE CONTO DEL DEGRADO DEL MATERIAL
CONTRIBUTI ALLO STUDIO DEI FENOMENI DI FATICA SUI VIADOTTI /
No full textDiscussione e risposta ad osservazioni di un Professore non sperimentatore convinto della non esistenza dei fenomeni di fatica.
Valutazione della vita di servizio ad a fatica di un viadotto a impalcato continuo a cassone precompresso. Valutazione degli effetti di fatica mediante la relazione Calzona-Dolara.
Inserimento nel NOTIZIARIO AICAP 11/94
FATICA SU UN VIADOTTO STRADALE A TRAVATA CONTINUA
No full textFATICA SU UN VIADOTTO STRADALE A TRAVATA CONTINUA
// Collana STUDI E RICERCHE - Dipartimento di ingegneria strutturale e geotecnica / Università degli studi di Roma "La Sapienza". ROMA: Esagrafica srl (Italy)
Ultra-High performance concrete (UHPC) with polypropylene (Pp) and steel Fibres: Investigation on the high temperature behaviour
Full text linkUltra-high performance concretes (UHPC) are advanced cement-based materials characterised by superior mechanical properties with respect to normal and high-strength concretes; however, their dense and compact matrix can facilitate the onset of spalling at high temperatures. This problem is often coped up by adding polypropylene (PP) fibres to the mix design, alone or with other types of fibres; steel fibres enhance the material's tensile capacity. The paper presents a series of tests on two UHPC types (150 and 180 N/mm2) with PP fibres (0.27% of volume) and variable content of steel fibres (0% to 1.92%), aimed at investigating the residual mechanical properties of the material after high temperature exposure. The experimental results are compared to available research on small UHPC specimens exposed to high temperatures, with dosages in PP fibres from 0.03% to 2%, and in steel fibres from 0 to 3%. The results of this research demonstrate that UHPCs need hybrid fibre reinforcement (PP + steel) to withstand high temperatures, and that the residual strength increases after 200 °C exposure, at all steel fibre dosages; this is in line with literature. Available research also shows that strength loss is possible in hot conditions, as found in the present research, while PP fibres alone do not always prevent the occurrence of spalling in small UHPC samples
Mechanical behaviour of masonry materials at high temperatures
No full textRisultati della campagna prove sperimentali eseguite presso Laboratorio VVF di Roma Capannelle su cilindri di materiali costituenti blocchi e malta per murature. Il report interno è in revisione alla rivista Fire & Materials Online ISSN: 1099-101
Il progetto strutturale in condizioni di incendio di autorimesse aerate nell'ambito dell'approccio ingegneristico
No full text
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
Research on the High Temperature Behaviour of Ultra-High-Performance Concrete (UHPC) with Polypropylene (PP) and Steel Fibres
No full textThe research features a series of tests on two types of Ultra-High Performance Concrete (UHPC, 150 and 180 N/mm2) with polypropylene (PP) fibres (0.27% of volume) and variable content of steel (S) fibres (0% to 1.92%), aimed at investigating the residual mechanical properties of the material after high temperature exposure. The results are compared to available research on small UHPC specimens exposed to high temperatures, with PP fibres from 0.03% to 2%, and S fibres from 0 to 3% of volume. The results demonstrate that UHPCs need hybrid fibre reinforcement (PP + S) to withstand high temperatures, and that the residual strength increases after 200 °C exposure, at all steel fibre dosages; this is in line with literature. Available research also shows that strength loss is possible in hot conditions, as found in the present research, while PP fibres alone do not always prevent the occurrence of spalling in small UHPC samples
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
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