1,721,045 research outputs found
Geophysical investigation for the rehabilitation of a flood control embankment Near Surface Geophysics
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Indagini geofisiche propedeutiche alla messa in sicurezza di una diga di laminazione sul fiume volturno (IS).
No full textEsperienze sulla misura di VS in sito tramite tecniche sismiche in foro: il contributo dell'Università di Roma "Sapienza" ai progetti S4 ed S6 INGV-DPC
No full textThe evolution of hydrogen induced defects and the restoration of π-plasmon as a monitor of the thermal reduction of graphene oxide
No full textIn this article, we study the modification of the optical, chemical and electronic properties of graphene oxide (GO) during thermal reduction in ultra-high-vacuum by combining the results of several electron spectroscopies. We find that the fraction of oxygen moieties on the surface, as deduced from the evolution of C 1s core level in photoemission, is progressively reduced upon increasing the annealing temperature from 150 to 650 °C. The intensity of the CH stretching mode, associated with CH defects on GO surface and measured in the low energy region of electron energy loss spectra (EELS), decreases as a function of the annealing temperature. The removal or the reduction of such hydrogen or oxygen defects induces a restoration of sp2 carbon hybridization. The presence of such hybridization is confirmed by the capability to excite π-plasmon as observed in the EELS spectra. In particular we find a critical annealing temperature (Tann = 300 °C) at which π-plasmon excitation via electron scattering is accessible suggesting the formation of graphene-like domains with size comparable with the plasmon wavelength (λp~5 nm). The linear dispersion of π-band close to Fermi level, as measured in UPS, confirms the formation of graphene-like domains
Electrical resistivity and seismic refraction tomography to detect buryed cavity
No full textNear-surface cavities can pose serious hazards to human safety, especially in highly urbanized town centres. The location of subsurface voids, the estimation of their size and the evaluation of the overburden thickness are necessary to assess the risk of collapse. In this study, electrical resistivity tomography (ERT) and seismic refraction tomography data are integrated in a joint interpretation process for cavity location in the city of Rome. ERT is a well established and widely employed method for cavity detection. However, additional information provided by seismic refraction tomography is capable of eliminating some potential pitfalls in resistivity data interpretation. We propose that the structure of the cavities defined by ERT can be used as a base to optimize seismic refraction tomography investigations within the framework of a joint interpretation process. Data integration and the insertion of a priori information are key issues for reducing the uncertainties associated with the inversion process and for optimizing both acquisition procedures and computation time. Herein, the two geophysical methods are tested on both synthetic and real data and the integration of the results is found to be successful in detecting isolated cavities and in assessing their geometrical characteristics. The cavity location inferred by geophysical non-invasive methods has been subsequently confirmed by direct inspection
Going Beyond Counting First Authors in Author Co-citation Analysis
Full text linkThe present study examines one of the fundamental aspects of author co-citation analysis (ACA) - the way co-citation
counts are defined. Co-citation counting provides the data on which all subsequent statistical analyses and mappings
are based, and we compare ACA results based on two different types of co-citation counting - the traditional type that
only counts the first one among a cited work's authors on the one hand and a non-traditional type that takes into
account the first 5 authors of a cited work on the other hand. Results indicate that the picture produced through this non-traditional author co-citation counting contains more coherent author groups and is therefore considerably clearer. However, this picture represents fewer specialties in the research field being studied than that produced through the traditional first-author co-citation counting when the same number of top-ranked authors is selected and analyzed. Reasons for these effects are discussed
Variations on the Author
Full text link“Variations on the Author” discusses two of Eduardo Coutinho’s recent films (Um Dia na Vida, from 2010, and Últimas Conversas, posthumously released in 2015) and their contribution to the general question of documentary authorship. The director’s filmography is characterized by a consistent yet self-effacing form of authorial self-inscription: Coutinho often features as an interviewer that rather than express opinions propels discourses; an interviewer that is good at listening. This mode of self-inscription characterizes him as an author who is not expressive but who is nonetheless markedly present on the screen. In Um Dia na Vida, however, Coutinho is completely absent form the image, while Últimas Conversas, on the contrary, includes a confessional prologue that moves the director from the margins to the center of his films. This article examines the ways in which these works stand out in the filmography of a director who offers new insights into the notion of cinematic authorship
Monitoring developmental trajectories in novel metaphor comprehension in children with ASD: a case study
Full text linkThe study of developmental trajectories in metaphor comprehension has prevailingly addressed typically developing children (TD children, henceforth), and more recently, also children with Autism Spectrum Disorder (ASD, henceforth). Monitoring these trajectories longitudinally illuminates potentialities and residual weaknesses in children having had difficulties in handling figurative language. The present study describes the case of a child with ASD, M.M. (a pseudonym) who received a specific intervention when he was 8,10 to improve sensory metaphor comprehension. Afterwards, his capability to explain physico-psychological metaphors, which are more complex, was monitored across a 5-year span. During this interval, M.M was assessed three times at approximately 18 months distance, and compared to a group of TD children matched by age, school grade, number and dates of assessment. The results at a test measuring physico-psychological metaphors are analysed. Beyond quantitative differences in performance, differences in the developmental trajectories of M.M. and the TD children are outlined. Some implications for clinical assessment and intervention with children with ASD are also pointed out
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