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Orazio Specchia and physics in Catania between the two World Wars
No full textIn this paper we briefly discuss the figure and scientific contributions of Orazio Specchia, an Italian physicist mainly operating in Bologna, Catania and Pavia, in the period between the two World Wars. In particular, we will examine his efforts in the modernization of teaching and research activity in physics at the University of Catania during his professorship (1933–1942)
Civic scientific literacy: A teaching learning sequence on the climate change
No full textThe lack of adequate scientific knowledge can greatly affect citizens’ choices, with serious consequences for the social capability to face main global challenges such as climate change. Scientific Civic Education (SCE) has to play a central role in the school of the future decades. We will discuss redesigning a Teaching Learning Sequence (TLS) on the physical bases of the greenhouse effect (GHE) in which the restructuring has been aimed at combining the disciplinary aspects with the most typical themes of the SCE and the perception of science. We report the results of some tests with students at different levels of education and the relationships between scientific knowledge and civic awareness will be focused
Stima della velocità di rotazione delle turbine eoliche con tecniche di analisi dei filmati video
Get PDFScopo del procedimento è ottenere la stima della velocità di rotazione di una turbina eolica, sul rilevamento delle immagini della turbina stess
Quantum gravity, higher derivatives and nonlocality
No full textThe aim of the workshop Quantum Gravity, Higher Derivatives & Nonlocality (QGRAV-2021) was to assess our current understanding of the interplay between gravity and quantum mechanics, with particular attention to what is the main role of higher derivatives and nonlocality in the formulation of a consistent theory of quantum gravity, and whether they are really necessary to describe Nature at
a fundamental level. The workshop had brought together various schools of thought, and besides talks numerous discussions were also held. In addition to focusing on
formal aspects of several approaches, applications of higher derivatives and nonlocality were also discussed in the context of cosmology and black-hole physics. In this
preface article we present a concise explanation of the main problems underlying the quantization of gravity in the high-energy regime, briefly list several approaches that have been proposed so far, and also provide a gist of what was intensively discussed during the workshop
Ghosts in ghost-free analytic infinite derivative gravity
No full textIn this note we would like to reiterate concisely the problem of ghosts in what seemed to be ghost-free infinite-derivative theories
Introduzione
Get PDFIntroduction to the Special Issue 'Sistemi e tecniche di documentazione, gestione e valorizzazione dell'architettura storica. Alcune recenti esperienze
Dal rilievo all'analisi di superfici complesse: il caso della pseudo-cupola di Galla Placidia
No full textPrevious studies conducted on the Mausoleum of Galla Placidia (between AD 432 and AD 450) have allowed us to identify the geometric rule used for the creation of its starry sky and to propose the initial considerations about the morphology of its pseudo-dome. At first sight, the turns of the stars describe regular circumferences that seem to lie on a plane, in reality their trend is a space curve resulting from a projection on the surface of the ceiling from a point centrally located, approximately at the height of the base of the windows. The geometry underlying this tracing is based on a series of cones whose angle at the vertex increases progressively, and whose materialization is possible thanks to the knowledge of the operating principle of the astronomical instrument called Triquetro and Ptolemy's table of chords. Apparently irregular, the ceiling is set on a parallelogram and is not traceable to operations of revolution of a curve, a cross vault or a pavilion vault. The section of the mesh with a set of horizontal planes with a distance of 10 cm has generated a set of curves, all different from each other, which we perceive connected by an unusual rule, not yet investigated. An initial analysis allowed to verify that we are dealing with hyperbolas. The present work proposes to continue the investigation of these curves and to hypothesize a construction technique that can be adopted in the context of a building site
Analisi e documentazione archeologica dell’edilizia storica in aree a rischio sismico: dall’atlante dei tipi costruttivi murari all’impiego delle moderne tecnologie di rilievo
Get PDFKnowledge is an essential operating procedure in any project involving direct intervention in historic buildings. Reading the stratification of natural and anthropic events on the architecture, providing the careful evaluation of its historical-constructive complexity, is a crucial step towards a full knowledge of the formal and physical characteristics of the building under analysis. The contribution, starting from the revision of the sheets used for documenting historical buildings in areas at seismic risk within the Ministry project of the Atlante dei Tipi Costruttivi Murari d'Italia, aims to illustrate, by means of a distinctive case study, that of the Pieve di Sant'Agata, how the contribution of modern surveying technology has significantly improved the recording of archaeo-seismological data both qualitatively and quantitatively. This information, once interpreted, provides a full historical, constructive and seismic understanding of the architectures, helping the process of historical knowledge of the context under study and, at the same time, the documentation, evaluation and planning of the restoration work
Strumenti per la comunicazione e la conservazione della documentazione del patrimonio archeologico: il complesso di Villa Adriana (Tivoli, RM) e il sito archeologico di Masada (Israele)
Get PDFToday we are able to produce a considerable amount of information in relation to heritage documentation thanks to the opportunities offered by remote sensing in all its aspects, from 3D laser scanner survey to the latest generation of photogrammetry. However, the remarkable ability to acquire data is not matched by methods of management, conservation and the possibility of using the generated databases at various levels. In the scientific area, not only visual techniques are experimented but also multisensory applications aimed at creating ‘intelligent’ digital models. In this work, some recent experiences carried out in the specific field of 3D digital survey documentation on sites of great archaeological interest are presented, such as Hadrian’s Villa in Tivoli, near Rome, and the Masada fortress in Israel
La digitalizzazione per la documentazione, lo studio e la fruizione di un sito archeologico. La VR experience del teatro di Ricina
Get PDFThis paper presents a workflow developed thanks to the collaboration between archae- ologists and engineers, aimed at the documentation, representation and virtual fruition of an archaeological site. The purpose is to exploit the data acquired through digital solutions and the consequent elaboration of a reality 3D model to support archaeological studies and to effectively disseminate their results. The presented case study is the Roman Theatre of Ricina (Villa Potenza, MC). The building has preserved much of its masonry, but it is very different from that which could be appreciated by the audience of theatrical performances in Roman times. The work has been developed according to three steps: 1) digital documentation of the site and elaboration of a reality-based 3D model; 2) study of the archaeological finds thanks to the reality-based 3D model and design of a possible reconstruction, represented through a second 3D model elaborated by anastylosis; 3) development of a Virtual Reality environment for the fruition and the interaction with the two 3D models. The final output is therefore an immersive VR application that offers the possibility to access to the theatre both in its current form and in the original one. An experience that is not limited to a simple visualization rather presenting itself as a guided tour across the centuries