921 research outputs found
"Il maestro e i discepoli attorno ad un tavolo": l'immaginazione salvifica di Enrico IV nella lettura di Umberto Artioli
No full textTra gli scritti pubblicati da Umberto Artioli un anno prima della sua improvvisa scomparsa, nel luglio 2004, si trova uno studio sull'Enrico IV di Luigi Pirandello. Allontanandosi dalle consuete chiavi interpretative di tipo realistico, lo studioso mette in luce il palinsesto allegorico sotteso alla concezione del testo, facendo emergere una serie di riferimenti evangelici legati all'Ultima cena. Il nocciolo dell'insegnamento del protagonista pirandelliano identifica nell'immaginazione teatrale la via per la salvezza. Benché l'iniziazione dei discepoli fallisca, l'Autore delinea le caratteristiche di un nuovo tipo di artista e del suo ideale rapporto con il pubblico; una figura che di lì a poco ispirerà le riflessioni di Bontempelli su un interprete estremamente duttile ed eclettico da poter essere guidato sulla scena al pari di una marionetta
The linking role of the Alps in past cultures: An archaeometric approach. Preface.
No full textThe Alps cover a large area characterized by a pronounced relief that has been shaped by glaciers and which, historically, has been arbitrarily separated by political frontiers. Arguably,
no other natural landscape in Europe has influenced our imagination as powerfully as the Alps. The Prealps and the Alpine foreland are also considered as part of the Alpine region because of geographical, cultural and historical links. Alpine climate, landforms, and hydrography, together with flora and fauna, form a complex environmental system that has determined the nature of the colonization and exploitation of the region by man. The Alpine habitat displays unique characteristics due to its richly diverse prehistory and history, which have yet to be comprehensively and coherently studied
Vedic math., magic math.,... damn math. matematica vedica, matematica magica,...maledetta matematica
No full textDa qualche anno, all’interno dell’ENEA, è in atto uno sforzo per utilizzare piattaforme di natura editoriale in grado di integrare la scrittura di testi scientifici con l’immediata fruibilità dello stesso in termini di calcolo, di modifica e/o aggiunte. L’idea, perseguita all’interno del gruppo UT-FIS-MAT , è stata quella di sviluppare un testo con un supporto interattivo con linguaggi di tipo Mathematica che permettessero di presentare un testo evoluto al punto che sia le formule che i grafici, possano essere modificati in modo da interagire attivamente con il testo stesso, verificando contestualmente il grado di comprensione. Ne recente passato (M. Artioli, G. Dattoli, P. L. Ottaviani and S. Pagnutti “Virtual Laboratory and Computer Aided Design for Free Electron Lasers outline and simulation”Energia, Ambiente e Innovazione, Maggio-Giugno 2012) un
concetto analogo è stato sviluppato per la creazione di un laboratorio virtuale dedicato sia allo sviluppo di macchine acceleratrici che di laser ad elettroni liberi. Il presente lavoro è una ulteriore testimonianza in tale senso. Abbiamo elaborato infatti un testo di natura divulgativa, fruibile da un pubblico di cultura non necessariamente scientifica, contenente materiale sia iconografico che di formule che si prestasse allo scopo di fornire una testimonianza efficace delle potenzialità del metodo e al contempo di tracciare un profilo storico di concetti ed idea matematiche appartenenti ad un contesto di solito non trattato nei corsi di scuole medie superiori e/o universitari.During the last years an effort has been put forward at ENEA aimed at developing a platform capable of editing scientific books in an interactive mode, namely with the option of modifying either the formulae and graphs.
The idea, developed by the group UT-FIS-MAT, has been that of providing a scientific book equipped with an interactive software like MATHEMATICA allowing the elaboration of a smart text yielding the possibility of interacting with formulae, plots and the text itself, allowing the understanding of the level of confidence acquired by the reader.
In recent times we have developed similar ideas to create a virtual laboratory dedicated to the design of particle accelerators and to Free Electron Lasers and this booklet is a further progress within such a direction. The text we have developed and dedicate to a not specifically scientific trained audience, includes iconographic and scientific material tailor suited for the goal of providing an effective tool illustrating the potentialities of the device and give an account of the historical evolution of a branch of mathematics usually not treated in the high school courses or/and at university level
Thermal expansion of cesanite between 22-390 °C
No full textThe expansion of cesanire, Ga2Na:3[(OH)(SOJ3]' was rneasured at, 236,
.324" 360 and39Q0C witha GlJ,ini~I'-Lel'm:é camera. ,At 390°C the results are:
al(22-39QoC) = 24.7, u3f22-3DOoC). = 39.0 XiQ-&C-1
• This preferential expansion
along c continues. even after a phase change which takes place at 425 aG
Powder diffraction and synchrotron radiation.
No full textPowder diffraction is one of the fundamental techniques for the investigation of materials. Its sensitivity to long range order makes it ideal for the identification, quantification and structural characterization of crystalline phases. Powder diffraction experiments performed at synchrotron sources make ample use of the intrinsic characteristics of synchrotron radiation in terms of energy tunability, brilliance, natural divergence, and excellent signal/noise ratio. Synchrotron radiation powder diffraction (SR-PD) enhances and optimizes the traditional applications of laboratory XRPD, such as phase identification, phase quantification, texture analysis, and peak broadening analysis in terms of stress/strain. However, the properties of the synchrotron X-rays also allow a number of experiments not accessible with laboratory sources, especially in terms of time-resolution, the use of non-ambient sample environments, and simultaneous and combined experiments. The mapping of the physical, chemical, and crystallographic properties of the sample in 2D and 3D using smart combinations of diffraction imaging spectroscopy is the natural current evolution of many synchrotron instruments, and one that is bound to have a great
impact on many aspects of materials studies
Imaging with neutrons
No full textBy exploiting the penetration, attenuation, and scattering properties of neutrons, images of matter in two or three dimensions reveal information unobtainable using other probes. Despite the limitation in brilliance of neutron sources, several neutron-based imaging techniques are essential to different aspects of modern geoscience. Typical examples include the evaluation of porosity in rocks and sediments, mapping of light elements in solids, noninvasive probing of cultural heritage objects, investigations of thick engineering components, and the exploration of diffusion and percolation processes of fluids within porous matrices, organo-inorganic composites, and living organisms. Techniques under development include simultaneous neutron and X-ray tomography in heterogeneous media, Bragg-edge imaging, and the possibility of porosimetry from dark-field imaging
From HPC to HPSS: The use of superplasticizers for the improvement of S/S technology
No full textThis paper presents an S/S treatment which is based on the principles of High Performance Concrete (HPC). By using superplasticizers and hydrophobic additives, the proposed process allows the transformation of contaminated soils and sediments into low water to cement ratio (W/C) granular materials. These grains are characterized by lower porosity,
lower leaching rate of inorganic contaminants and lower water absorption as well as higher mechanical properties and improved durability compared to solidified products obtained without additives. Moreover, the mixing water may be reduced more than 25%. The results of X-ray microtomography and mercury intrusion porosimetry measurements carried out on samples prepared with and without additives are illustrated here. Volatile and/or semi-volatile organic pollutants, if present, can be removed from the granular material by a steam distillation step, at relatively low temperature (max 250°C) and under vacuum (P < 0.1 bar) in excellent yield. The resulting aggregates are suitable for the re-utilization as backfilling, concrete aggregates or may be employed for covering landfills and in other civil engineering projects
Itinerarium mentis in nihil
No full textThe author reconstructs the topos of Six characters in search of an author which is present in Pirandello's works in the span of time from 1897 to the unfinished The giants of the Mountain (in his theatrical works as well as in his novels and short stories). The decisive contribution concerns the symbolic decodification of the said topos. By means of the onomastic scan (a form which Pirandello takes both from Filone of Alexandria and Middle Ages allegorical procedures), Umberto Artioli goes back to the secret sources of the Sicilian dramatist and one prevails above all. Serafino Gubbio, the protagonist of Camera! [Si gira], refers to the six-winged angel (the Seraphim to be exact), on which Bonaventura exemplified, in his famous Itinerarium mentis in Deum, the ascending gradatio. And not only: the medieval text is even the palimpsest on which Pirandellorewrites his own novel, according to the plans which remind Joyce's Odyssey rewriting
VEM-based tracking algorithm for cohesive/frictional 2D fracture
No full textThe present paper proposes an innovative nucleation and propagation algorithm for fracture evolution in 2D cohesive media, based on virtual element method (VEM) technology. Initially, an interface cohesive law is described, which is able to account for the crack opening due to the evolution of a damage variable in mode I, mode II, and in mixed mode; the model includes unilateral contact and frictional effects. The VEM, which is used to model the elastic behavior of the bulk material, is presented in a simple and viable way, illustrating the projection operation necessary for defining strain and stress in a typical element, and discussing the stabilization technique. Then, the numerical algorithm for reproducing the crack nucleation, the fracture path generation and evolution is described. The procedure fundamentally consists in two steps, i.e. the nucleation and propagation criteria, and the topological adaptive mesh refinement. Numerical applications are developed in order to assess the ability of the proposed procedure to satisfactorily reproduce the crack nucleation and growth in solids. Comparisons with numerical results available in literature are reported, remarking the reliability of the implemented algorithm
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