810 research outputs found
Paolo Delogu, Gabriella Maetzke, Pasquale Natella, Paolo Peduto, Eleonora Tabaczynska, Stanislaw Tabaczynski, Caputaquis medievale, 1976
No full textPoisson Jean-Michel. Paolo Delogu, Gabriella Maetzke, Pasquale Natella, Paolo Peduto, Eleonora Tabaczynska, Stanislaw Tabaczynski, Caputaquis medievale, 1976. In: Archéologie médiévale, tome 9, 1979. pp. 235-238
Neural networks for automatic diagnosis of labeled monodispersed aerosols in obstructive lung disease
No full textFeed-Forward Artificial Neural Networks (FF-ANN) can be used as classifier when suitably trained. In this paper we trained a FF-ANN to classify images of the lung, in order to develop a system for the automated image-based diagnosis of the bronchial stenosys. After a pre-processing filler we have used an FF-ANN, trained using two backpropagation methods,with momentum and the weight decay, to perform a classification into four classes of disease. The results are very close to the human classification
Chi ha paura del potere? Politica e comunicazione negli studi sull’età moderna
No full textIl saggio si propone di spiegare come la recente storiografia ha analizzato il rapporto fra potere e comunicazione nel corso dell’età moderna. Le ricerche svolte hanno avuto il merito di saldare molteplici frameworks metodologici (quelli della storia culturale, intellettuale, istituzionale, politica, ed economica), riuscendo così a ricostruire fitte reti di connessione tra diversi luoghi lontani e rilevando la presenza di un sistema globale già a partire dal XVI secolo. Tuttavia i modelli interpretativi correnti non paiono ancora sufficienti a disvelare la fabbrica dell’informazione. Quello che manca è una focalizzazione sulle forze sociali, politiche ed economiche che plasmano l’informazione e veicolano i flussi comunicativi. È quindi necessario – sottolineano gli autori – affinare gli strumenti di indagine per identificare chi costruisce le notizie e quali poteri esercitano la loro egemonia sull’infosfera.The essay aims to explain how recent historiography has analyzed the relationship between power and communication in the early modern age. The research carried out had the merit of welding multiple methodological frameworks (those of cultural, intellectual, institutional, political, and economic history), thus succeeding in reconstructing dense networks of connection among different distant places and detecting the presence of a global system since the beginning of the 16th century. However, current interpretative models still do not seem sufficient to unveil the information factory. What is missing is a deeper focus on the social, political, and economic forces that shape information and convey communication flows. It is therefore necessary – the authors argue – to refine the investigation tools to identify who builds the news and which powers exercise their hegemony over the infospher
[OA158] Noise equivalent number of quanta (NEQ): A tool for choosing the optimal reconstruction algorithm in computed tomography (CT)
No full textPurpose
Evaluate optimal reconstruction algorithm and voxel size for a breast CT system using NEQ
X-ray spectra reconstruction from analysis of attenuation data: A Back Scattering Thomson source application
No full textIt is known that useful information about the spectral distribution of an X-ray beam can be extracted by measuring and analyzing its transmission curve. This kind of approach to the characterization of the distribution in energy of photons is justified when the direct measurements of the energy of a single photon becomes too expensive or cannot just be performed. Thomson Scattering sources can produce up to 10(8) photons within a pulse 10 ps long. Hence the rate of incidence of photons is too high to apply traditional X-ray spectroscopy methods while methods based on the transmission curve can still be used. In order to propose an application of these techniques in the characterization of a Thomson Scattering source we studied an iterative statistical algorithm (Expectation-Maximization) used as a regularization method on simulated measurement computed starting from a calculated energy distribution with peak energy of 20 keV. Results show that this method can give good approximations in the low energy range (approximately 20 keV) and that it is at least sensible to a small amount of radiation in the higher part of the energy range (approximately 70 keV). The robustness of the method against non-ideal experimental conditions is also considered. (C) 2009 Elsevier B.V. All rights reserved
Gli Studi filosofici nell’Università di Sassari (1765-1960)
No full textCon la riforma boginiana si dà impulso al rinnovamento della cultura accademica isolana, anche di quella filosofica, a Sassari come a Cagliari. Gli intellettuali sardi si mostrano sempre più attenti ai grandi pensatori della filosofia moderna intesa come istanza di libertà nella ricerca filosofico-scientifica. Il dibattito filosofico viene introdotto a Sassari ai primi dell’Ottocento da Pasquale Tola, profondo conoscitore della filosofia europea contemporanea (e del pensiero illuministico e romantico in particolare). Le prospettive filosofiche e, più in generale, teoriche cambiano
in Sardegna nella seconda metà dell’Ottocento, quando il sapere speculativo o meramente metafisico cede il passo via via alle scienze umane, soprattutto all’Economia politica, alla Sociologia e alla Filosofia del diritto grazie all’impegno di intellettuali come Giovanni Pinna Ferrà, docente nella Università di Sassari per quaranta anni, passando per la lezione di Giorgio Del Vecchio e di Antonio Falchi, fino all’impegno filosofico e morale di Antonio Pigliaru
Application of an expectation maximization method to the reconstruction of X-ray-tube spectra from transmission data
No full textAn expectation maximization method is applied to the reconstruction of
X-ray tube spectra from transmission measurements in the energy range
7 − 40 keV. A semiconductor single-photon counting detector, ionization
chambers and a scintillator-based detector are used for the experimental
measurement of the transmission. The number of iterations required to reach
an approximate solution is estimated on the basis of the measurement error,
according to the discrepancy principle. The effectiveness of the stopping rule
is studied on simulated data and validated with experiments. The quality
of the reconstruction depends on the information available on the source
itself and the possibility to add this knowledge to the solution process is
investigated. The method can produce good approximations provided that
the amount of noise in the data can be estimated
Valutazioni rinomanometriche in soggetti respiratori orali sottoposti a disgiunzione rapida del palato(risultati preliminari).
No full textEffects of RPE in patients with ORL pathologies. Skeletal and alveolar changes of maxillary.
No full text- …
