1,720,966 research outputs found
Acceleration waves and oscillating gas bubbles modelled by rational extended thermodynamics
Full text linkThe study of acceleration waves for a rarefied polyatomic gas is carried out in planar, cylindrical and spherical geometry referring to the rational extended thermodynamics theory with 14 moments. The case of a rarefied monatomic gas is determined as a limit case, and the role of geometry and molecular degrees of freedom is investigated. In addition, the behaviour of an acceleration wave travelling inside an oscillating gas bubble is modelled by the 14-moment PDE system under adiabatic condition. We show that dissipation combined with hyperbolicity tends to inhibit shock formation, and that the dynamic pressure cannot be zero inside the oscillating bubble. This fact can produce observable effects even in the Navier–Stokes approximation, if the gas exhibits high bulk viscosity
Conoscere per conservare l'identità. Ricerche e studi sul castello di Cusercoli
No full textDescrizione delle attività scientifiche e didattiche svolte presso il laboratorio di archeoingegneria CAILab con sede a Cusercoli e trattazione sintetica delle problematiche geologico-strutturali connesse con il castello di Cusercoli
CFD modeling of indoor ventilation and temperature distribution in the Nativity church in Bethlehem
No full textThe work presented in this paper is part of an international project about the Basilica of Nativity in Bethlehem, famous and ancient Church dating back to the late 6th century and added in 2012 to the UNESCO world heritage list. Here we present a preliminary Computational Fluid Dynamics (CFD) study of indoor flow and temperature fields in this still well-preserved building. In particular, the aim of the numerical simulation is to examine the impact of windows opening on indoor thermal equilibrium of the church,
characterized by a complex geometry. The computed air temperature in the steady-state regime and the time historyof air speed suggest that this simple but effective strategy can improve both the thermal comfort during visiting hours and the conservation conditions for mosaics and mural paintings
Esercizi e Temi d'esame di Meccanica Razionale
No full textIl volume è indirizzato agli studenti dei vari corsi di studio della scuola di Ingegneria e Architettura e raccoglie numerosi esercizi e prove d'esame assegnate negli Anni Accademici passati
3D Thermal Imaging System with Decoupled Acquisition for Industrial and Cultural Heritage Applications
Full text linkThree-dimensional thermography is a recent technique—with various fields of application—that consists of combining thermography with 3D spatial data in order to obtain 3D thermograms, high information objects that allow one to overcome some limitations of 2D thermograms, to enhance the thermal monitoring and the detection of abnormalities. In this paper we present an integration methodology that can be applied to merge data acquired from a generic thermal camera and a generic laser scanner, and has the peculiarity of keeping the two devices completely decoupled and independent, so that thermal and geometrical data can be acquired at different times and no rigid link is needed between the two devices. In this way, the stand-alone capability of each device is not affected, and the data fusion is applied only when necessary. In the second part, the real effectiveness of our approach is tested on a 3D-printed object properly designed. Furthermore, one example of an application of our methodology in the cultural heritage field is presented, with an eye to preservation and restoration: the integration is applied to a marble statue called Madonna with the Child, a fine work of the Florentine sculptor Agostino di Duccio (1418–1481). The results suggest that the method can be successfully applicable to a large set of scenarios. However, additional tests are needed to improve the robustness
Il dissesto idrogeologico e la messa in sicurezza del castello di Cusercoli
No full textNel piccolo borgo medievale di Cusercoli, all’interno dell’antica rocca, e stato costituito il 17 giugno 2006 il Laboratorio di Archeoingegneria CAILab, che afferisce al Dipartimento di Ingegneria Industriale (DIN) dell’Alma Mater Studiorum - Universita di Bologna e che fa parte della sede di Forli della Scuola di Ingegneria e Architettura. Il Castello di Cusercoli costituisce, un raro caso di compresenza di tecniche costruttive di differenti periodi, la cui anatomia risulta di facile lettura per lo stato di conservazione in cui il manufatto verte oggi. Proprio in virtù di questa caratteristica, il monumento si qualifica per lo sviluppo della funzione museale, in relazione a quanto il complesso ha da raccontare, come caso esemplificativo dell’architettura della tradizione territoriale; questo tipo di fruizione può essere integrato e potenziato proprio con la presenza dell’Università, sfruttando i rapporti già instaurati ed offrendo così agli studenti l’occasione di apprendere esercitandosi in prima persona sul campo, contribuendo attivamente al progetto del Museo dell’Anatomia dell’Architettura. Il castello di Cusercoli rappresenta un caso emblematico di tentativi di messa in sicurezza di un sito storico con gravi problematiche
geologico-strutturali in cui gli interventi che sono stati realizzati nel tempo risultano privi di un’adeguata pianificazione. L’attenzione per il castello di Cusercoli è motivata dalla necessita di non perdere quel complesso di valori di cui si evidenzia la testimonianza delle tradizionali tecniche costruttive locali, delle quali si va perdendo la memoria storica
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
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