1,720,984 research outputs found

    Verifica della precisione nella determinazione della pendenza trasversale della carreggiata

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    La Sede di Topografia e Fotogrammetria del Dipartimento di Ingegneria Civile di Pisa, in collaborazione con il Centro di Eccellenza per la Ricerca in Telegeomatica dell’Università di Trieste, ha messo a punto diverse metodologie per la determinazione della pendenza trasversale delle falde della carreggiata. Questa misura viene realizzata sia mediante l’utilizzo del laser a scansione monoassiale IBEO Automotive LD GmbH, sincronizzato con il sistema Applanix POS LV, integrato sul veicolo MMS GIGI One, sia dall’elaborazione dei soli dati inerziali in output dal sistema di posizionamento. L’obiettivo di questo lavoro è quello di presentare una verifica della precisione delle diverse metodologie, sia confrontandone sistematicamente i risultati sia collaudando gli stessi con misure topografiche classiche puntuali

    Residual Stresses in a Cu-CFC Component for Thermonuclear Application: Numerical Prediction and Experimental Evaluation Using an Indentation Technique

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    The present work concerns the assessment of residual stresses (RS) in a component for thermonuclear applications, made by casting of copper on a carbon fibre-reinforced carbon composite and intended to be subjected to severe cycles of thermal, mechanical and neutron loads. The magnitude of RS left at the interface between the two materials in the production process, due to thermal expansion mismatch, has to be carefully assessed. In the present investigation, the likely spatial distribution of the RS has been predicted first using numerical analysis and has been validated experimentally, then, on the basis of the results of indentation tests performed at the micron scale on the metal layer. It is shown that this simple and fast methodology can return reliable results in the present context

    Going Beyond Counting First Authors in Author Co-citation Analysis

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    The 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
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