1,720,989 research outputs found
LA MODELLAZIONE PARAMETRICA PER L’INTERPRETAZIONE DEGLI SPOSTAMENTI DELLE CAPRIATE LIGNEE DI SAN SALVATORE
No full textL’articolo punta ad approfondire la conoscenza delle capriate lignee e della loro evoluzione nel tempo, attraverso la rielaborazione e interpretazione dei dati ottenuti dal rilievo laser scanner. Dalla nuvola di punti dell’intero sottotetto, si ricavano, attraverso software di reverse engineering e modellazione parametrica, modelli 3D delle singole capriate. Ciascun modello, ottenuto fissando solide ipotesi costruttive ed evolutive a cui queste strutture devono rispondere, costituisce una regressione nel tempo della capriata dalla condizione “attuale” a quella “originale”. Il modello “ideale o teorico” rappresenta, quindi, una ragionevole configurazione indeformata al momento della messa in opera. Effettuando poi un confronto tra i modelli e la nuvola di punti è possibile leggere le capriate in modo dettagliato, analizzarne spostamenti e deformazioni, derivare informazioni puntuali e comparate sul loro comportamento e trarre considerazioni globali sullo stato di salute dell’intero sottotetto.The article aims to deepen the knowledge of wooden trusses and their evolution over time, through the reworking and interpretation of data obtained from a laser scanner survey. From the point cloud of the entire roofing, 3D models of the single trusses are obtained through reverse engineering and parametric modelling software. Each model is obtained by fixing solid constructive and evolutionary hypotheses to which these structures must respond and represents a regression in time of the truss from the "current" to the "original" condition. The "ideal or theoretical" model represents, therefore, a reasonable undistorted configuration at the time of construction. Then, by comparing the models with the point cloud, it is possible to analyze these trusses in detail, highlight their movements and deformations, derive precise and comparative information on their behavior and draw global considerations on the state of health of the entire roofing
SAFETY AND QUALITY MANAGEMENT IN CONSTRUCTION SITES THROUGH VALIDATION: “PROGETTO RADDOPPIO” - A CASE STUDY BY POLITECNICO DI TORINO.
No full textPredictions of the crystal structure and solid-phase transition of N-methylacetamide, based on packing-energy calculations
No full textThe crystal structure of AcNHMe (I) was calcd. by energy-potential functions, based on van der Waals force and H bond energy packing, in good agreement with exptl. x-ray data. The solid-phase transition obsd. at ∼10° to give orthorhombic I with a 9.61, b 6.59, c 7.30 Å, and space group Pnma, was discussed in terms of a 2nd energy min. in the packing energy plots
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
Opere provvisionali per manufatti in calcestruzzo: Gestione operativa, Produzione, Sicurezza
No full textLe opere provvisionali, in generale, e le casseforme in particolare hanno avuto un importante processo evolutivo negli ultimi decenni.
L’evoluzione ha riguardato sia il loro miglioramento in termini tecnologici e costruttivi sia gli aspetti ergotecnici. Gli ultimi focalizzano l’attenzione sull’ottimizzazione del loro uso e gestione per quanto riguarda la qualità operativa e la sicurezza.
Si è passato da casseforme costituite da semplici fodere di legno, realizzate in cantiere, a veri e propri sistemi di casseratura realizzati in stabilimento, seguendo criteri di produzione industriale.
La stessa matrice tecnologica in legno si è sviluppata enormemente verso pannelli multistrato industriali, sistemi componibili a travi o a telaio, fi nalizzati a specifi che funzioni e prestazioni.
Si è assistito progressivamente all’innovazione del concetto dell’opera provvisionale, da oggetto a sistema, infatti, la progettazione operativa in genere, e quella delle opere
provvisionali in edilizia, a tutt’oggi non è stata ancora suffi cientemente introdotta nel processo edilizio; purtroppo è un ambito lasciato il più delle volte alla discrezionalità delle imprese, quando gran parte delle decisioni dovrebbe essere gestita già in fase di progettazione.
Il settore delle costruzioni è connotato da una pluralità di soggetti con compiti, ruoli e poteri diversi, anche se non sempre chiaramente differenziati ed individuati: ad esso manca la compiutezza del “sistema” nel quale i diversi soggetti operano in modo assolutamente integrato per raggiungere non più un oggetto concepito e realizzato esclusivamente dall’Impresa, bensì, un sistema da studiare e scegliere in modo appropriato,
in rapporto alle esigenze e condizioni del contesto d’intervento
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
Architetture costruite di Enrico Castiglioni nella Scuola Italiana di Ingegneria
No full textDuring the 1950s, "made in Italy" structures established all over the world. Italian architects presented authorial interpretations of the “structuralist” mood, transforming structural topics in the alphabet of a new architectural language, deeply intertwined with the artisanal dimension of the cast in situ reinforced concrete construction site. The architect-engineer Enrico Castiglioni was deeply involved in this collective adventure. His works (disclosed by the international attention due to visionary un-built projects), represent, in the Italian School of Engineering, a unique local story to be discolosed and disseminated. This contribution presents first results of ongoing surveys on the most significant built structures of Varese district. The study is conducted within the research project "SIXXI – Twentieth Century Structural Engineering: the Italian Contribution" (ERC Advanced Grant, PI Sergio Poretti, Tullia Iori)
Managing safety and quality on construction sites Trough Validation
No full textThis document relates to the validation procedure for the Politecnico di Torino “Progetto Raddoppio”.
In Italy, following the introduction of European regulations and current national legislation,
validation management of the “construction process” is acquiring strategic value and aims to reduce
problems encountered at works completion stage. In most cases at present, validation is via formal
documentation control by the purchaser, whereas in other cases such as this, validation is performed
by an external authority and involves systematic project and contractual document monitoring.
The final validation management report should cover the entire procedure, from preliminary to
executive project design.
In the case study, the validation procedure was applied only in the executive design stage, and
therefore the problems encountered as indicated under “observations” mainly relate to typical aspects
concerning this project stage, e.g. technological difficulties and those relating to works management
and construction site organisation (work safety management and environmental impact management).
This document aims to clarify observations recorded in the validation procedure, explaining how these
influenced the technological choices and works management aspects in the executive stage, including
safety management, regarding both operators and environmental impact
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