Search results for " culturali"
showing 10 items of 1669 documents
The gas chromatography/mass spectrometry can be used for dose estimation in irradiated pork
2009
Abstract Food safety can be improved using ionizing radiation to reduce food spoilage and to extend its shelf life. The gas chromatography/mass spectrometry (GC/MS) has been validated by the European Community as a powerful method to identify irradiated food containing fat. The preliminary goals of our research were: (i) to set up this method, based on the detection of radiation induced 2-dodecylcyclobutanones (2-DCB) in pork muscle samples and (ii) to check the microbiological efficacy of the treatment. The main objective was to render the GC/MS a quantitative technique for dose estimation, through the measurement of the 2-DCB concentration in the irradiated sample. Our results show that t…
Educazione sessuale come educazione morale
2021
Il saggio introduce e analizza il dibattito che vede tra i protagonisti il ginecologo Doléris e il sociologo Durkheim permettendo di osservare in che termini e con quali osservanze, alle porte della Grande Guerra, la sessualità entrava nei dibattiti, come anche nelle scuole e negli istituti; dall’altro lato aiuta nella comprensione di una figura poliedrica, eclettica, quella del padre putativo del funzionalismo organicista, tassello fondamentale per l’intera storia della sociologia, Émile Durkheim. Ancora oggi la figura del sociologo è piuttosto dibattuta e si muove all’interno di un paradosso che lo vede sia come un progressista che come un conservatore. The essay introduces and analyzes t…
Six-dimensional measurements of trains of high brightness electron bunches
2015
Trains of ultrashort electron pulses with THz repetition rate, so-called comblike beams, are assuming an ever growing interest in plasma-based acceleration. In particle-driven plasma wakefield acceleration (PWFA), a train of driver bunches with separation of the order of plasma wavelength, i.e., 300 μm, resonantly excites a plasma wake, which accelerates a trailing witness bunch, injected at the accelerating phase. Comblike beams have great potentialities in different fields of applications. In particular, radiation sources, such as free-electron lasers and THz radiation, take advantage from the possibility to tailor electron beams modulated both in time and energy, to customize emission ba…
Dating of Brazilian shells through electron paramagnetic resonance
2019
In the present work we report dating procedure of these shells by using the electron paramagnetic resonance. The first step of the analysis was the definition of the optimal procedure for sample preparation. At this aim the analysis of the sample composition was carried out by X-ray fluorescence (XRF) measurements and an accurate analysis was study on the effect of the chemical etching with varying typology and concentration of acid to be used for removing the external layer of shells which are affected by alpha particles.
ELECTRON SPIN RELAXATION PROCESS IN SILICON CRYSTALS
2014
Recently, electrical injection of spin polarization in n-type and p-type silicon has been experimentally carried out up to room-temperature. Despite of these preliminary but promising experimental results, a comprehensive theoretical framework concerning the influence of transport conditions on the phonon-induced spin depolarization process in silicon structures, in a wide range of values of temperature, doping concentration and amplitude of external fields, is still in a developing stage. In order to elucidate the electron transport and spin dynamics of conduction electrons in lightly doped n-type Si crystals we have performed semiclassical multiparticle Monte Carlo simulations and numeric…
Monte Carlo Simulation of Spin Relaxation of Conduction Electrons in Silicon
2014
Recently, electrical injection of spin polarization in n-type and p-type silicon up to room-temperature has been experimental- ly carried out. Despite of these promising experimental results, a comprehensive theoretical framework concerning the influence of transport conditions on the spin depolarization process in silicon structures, in a wide range of values of temperature, doping concentration and amplitude of external fields, is still in a developing stage. In this contribution we use a semiclassical multiparti- cle Monte Carlo approach to simulate the electron transport and spin dynamics in lightly doped n-type Si crystals and numerically calculate the spin lifetimes of drifting electr…
HOT-ELECTRON NOISE FEATURES IN SILICON CRYSTALS OPERATING UNDER PERIODIC SIGNALS
2014
We study the intrinsic noise in n-type Si crystals operating under high-frequency periodic electric fields. To simulate the dy- namics of electrons in the bulk, by taking into account the main details of band structure, scattering processes, as well as heating effects, a Monte Carlo approach is used. The noise properties are investigated by computing the velocity fluctuations correlation function, its spectral density, and the total noise power for different values of the amplitude and frequency of the driving field. We show that the noise features are significantly affected by the electric field amplitude and frequency and discuss their peculiari- ties in comparison with those exhibited in…
Emozioni, rischi e stress. Indagini preliminari
2021
Una breve introduzione a una raccolta di saggi su questioni psico-pedagogiche connesse a emozioni, rischi e stress. A brief introduction to a collection of essays on psycho-pedagogical issues related to emotions, risks and stress.
SIMaging the City. The Educational Use of Video Games in a Youth Club of Palermo
2016
Media Education (Media Literacy, Media Literacy Education) has a great potential in informal education contexts. As with schools, in these contexts too media can be adopted both as a tool of expression/communication/information retrieval and as an object of study in and of itself, with multifaceted - and often contradictory - implications (social, cultural, political, economic, etc.). This double level of media use in educational contexts (either formal or informal) is crucial for the development of the citizenship in the digital era, for fostering social inclusion and promotion as well as cultural and intercultural growth and exchange. Media educators operating in these contexts play the f…
'Le fabbricerie'
2008
La fabbriceria è un’istituzione d’origine antichissima è ha il suo presupposto nella reciproca collaborazione tra pubblico e privato nella manutenzione delle chiese di maggiore importanza, soprattutto le cattedrali. Lo studio, partendo dalla constatazione del duplice dato apparentemente contraddittorio, della persistente utilità simbolica ed effettiva dell’istituto in punto di fatto ma giuridicamente assoggettato a una legislazione residuale, offre alcune possibili risposte alle questioni più annose emerse in dottrina e in giurisprudenza e in particolare con riguardo al duplice dubbio: se esse siano o meno ecclesiastiche, individuandone l’effettiva ‘ecclesiasticità lata’; se siano o meno en…