Metodologie di Analisi Wavelet e Tempo-Frequenza per il Monitoraggio di Segnali Radio

Sono state sviluppate due tecniche di analisi tempo-frequenza, Wavelet e STFT, per la detection di segnali narrowband immersi in uno scenario wideband a radiofrequenz

A Model for the Prediction of Fiber Elasticity

A model is presented that enables the elastic properties of wood fibers to be estimated from the properties of its polymeric constituents, cellulose, hemicellulose, and lignin. The influence of the value of the axial stiffness of the cellulose crystal is demonstrated, its proper value being discussed in comparison with experimental data on fibers. The effects on fiber stiffness of the S2 fibril angle, the fibril angles of other layers, the crystallinity, and layer thicknesses are analyzed. The manner in which the effect of a variation in yield can be simulated by a change in shape factor of the reinforcing cellulose crystals is demonstrated, the cell wall thus being considered to be a discontinuous reinforced composite

Acupuncture for Pain Treatment

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Dio, l'evento e l'algoritmo: il tradimento di Leibniz nell'ontologia digitale e l'etica dell'istante

This article shows how the so-called digital ontology betrays the metaphysical-theological thought of Leibniz (of which it claims to be heir), giving rise to an apparent “algorithmic providence” which, however, confines subjects in algorithmic types, making it impossible the occurrence of event and of the new. If digital ontology sees in Leibniz a thinker from whom to interpret being on the basis of algorithms, this article – by reconstructing Leibniz’s thought – wants to show not only how the operation of digital ontology is not legitimate, but also how – through Leibniz’s doctrine of the divine decrees – it is possible to think of a praxis effectively generating of event. Starting from Leibniz, therefore, we will describe a metaphysics of the instant, in which the moment of decision and action is untied from algorithmic determinism. In conclusion, the article proposes that the theological-metaphysical notion of Providence can constitute a central idea for thinking a practice that is able to transcend the immanence of virtual reality, dominated by algorithmic determinism and the indefinite reproduction of the identical

Fuzzy FMECA analysis of radioactive gas recovery system in the SPES experimental facility

Selective Production of Exotic Species is an innovative plant for advanced nuclear physic studies. A radioactive beam, generated by using an UCx target-ion source system, is ionized, selected and accelerated for experimental objects. Very high vacuum conditions and appropriate safety systems to storage exhaust gases are required to avoid radiological risk for operators and people. In this paper, Failure Mode, Effects, and Criticality Analysis of a preliminary design of high activity gas recovery system is performed by using a modified Fuzzy Risk Priority Number to rank the most critical components in terms of failures and human errors. Comparisons between fuzzy approach and classic application allow to show that Fuzzy Risk Priority Number is able to enhance the focus of risk assessments and to improve the safety of complex and innovative systems such as those under consideration

Development and characterization of an innovative ASIC pixel detector for imaging based on chromatic photon counting technology

The purpose of this work is to characterize Pixirad (INFN spin-off) detector system, an innovative X-ray imaging sensor with intrinsic digital characteristics, based on Chromatic Photon Counting technology. The system counts individually the incident X-ray photons and selects them according to their energy to produce two color images per exposure. The energy selection occurs in real time and at radiographic imaging speed (GHz global counting rate). Photon counting, color mode and a very fine spatial resolution allow to obtain a high ratio between image quality and absorbed dose. The individual building block of the imaging system is a two-side buttable semiconductor radiation detector made of a thin pixellated CdTe crystal coupled to a Very Large Scale Integration (VLSI) CMOS pixel ASIC (Application Specific Integrated Circuits). The first chapter is devoted to introduce the basic processes of interaction of photons with matter. In the second chapter the most common radiographic metrics are described with an introduction to the imager systems. The third chapter focuses on the pixel detectors, describing the physical mechanism of charge collection involved in the CdTe sensor and explaining the principal components of the front-end electronic chain. In the fourth chapter the general features of Pixirad detector system are described. The chapter five is focused on the characterization of the Pixirad-1 detector system from the spectroscopic point of view: an energy calibration and resolution has been carried out using different X-ray sources and the charge sharing fraction has been evaluated by exploiting the monochromatic Elettra synchrotron beam. The aim of chapter six is the characterization of the imaging performance of the detector with monochromatic synchrotron radiation at different energies, investigating the linearity of the system, the ratio between detector counts and number of impinging photons, as a function of energy and discriminator thresholds, the pixel noise and the spatial resolution. In the chapter seven are showed some last measurements with PIXIE III: the third and last generation of Pixirad ASIC. In particular the full recovering of the charge sharing effect is demonstrated at 62 micron pixel pitch allowing the sharp spectral separation between the color images

HBIM in a semantic 3D GIS database

This work describes the different attempts and the consequent results derived from the integration of an HBIM model into an already structured spatial database (DB) and its 3D visualisation in a GIS project. This study is connected to the European ResCult (Increasing Resilience of Cultural Heritage) project where a DB for multiscale analyses was defined. To test the methodology proposed, the case study of Santa Maria dei Miracoli church in Venice was chosen since it represents a complex architectural heritage piece in a risk zone, it has been subject to a vast restoration intervention in the recent past but a digital documentation and model concerning it was missing. The 3D model of the church was structured in Revit as a HBIM, with the association of different kind of information and data related to the architectural elements by means of ‘shared parameters’ and ‘system families’. This procedure allows to reach an even higher Level of Detail (LOD4), but lead to some issues related to the semantic and software interoperability. To solve these problems the existing DB for the resilience of cultural heritage was extended adding a new entity representing the architectural elements designed in the BIM project. The aim of the test is to understand how the data and attributes inserted in the HBIM are converted and handled when dealing with a GIS DB, stepping from the IFC to the CityGML standard, through the FME software

hbim in a semantic 3d gis database

Abstract. This work describes the different attempts and the consequent results derived from the integration of an HBIM model into an already structured spatial database (DB) and its 3D visualisation in a GIS project.This study is connected to the European ResCult (Increasing Resilience of Cultural Heritage) project where a DB for multiscale analyses was defined. To test the methodology proposed, the case study of Santa Maria dei Miracoli church in Venice was chosen since it represents a complex architectural heritage piece in a risk zone, it has been subject to a vast restoration intervention in the recent past but a digital documentation and model concerning it was missing.The 3D model of the church was structured in Revit as a HBIM, with the association of different kind of information and data related to the architectural elements by means of 'shared parameters' and 'system families'. This procedure allows to reach an even higher Level of Detail (LOD4), but lead to some issues related to the semantic and software interoperability. To solve these problems the existing DB for the resilience of cultural heritage was extended adding a new entity representing the architectural elements designed in the BIM project.The aim of the test is to understand how the data and attributes inserted in the HBIM are converted and handled when dealing with a GIS DB, stepping from the IFC to the CityGML standard, through the FME software.</p

Analysing Wiki Quality using Probabilistic Model Checking

Abstract-Wikis delineate a new work tool in enterprises and they are spreading everywhere. Indeed, they are often used as internal documentation for various in-house systems and applications as well as powerful tools for collaboration and knowledge sharing. As occurs with software, the fundamental growth of a wiki may lead to its degradation. The quality of wikis, especially in enterprise contexts, should not play a trivial role. Software quality is a very discussed topic, but there are not many studies regarding the quality of wikis. We propose a probabilistic model to represent wikis and to investigate their quality. Due to the similarity with the World Wide Web it is natural to consider the popular Google PageRank (with minor modifications) to calculate probabilities between pages. Each wiki category, a set of wiki pages, is modelled using the PRISM language in order to verify specific properties in PCTL*. Experiments conducted on a adequate number of (enterprise) wikis assess the validity of our methodology