1,721,625 research outputs found
Visualizzazione di attrezzature d'uso per la città e loro inserimento nella scena urbana.La rappresentazione di sculture concepite come architetture da parte di un artista. Esempi di assemblaggi creativi utilizzando scarti di lavorazione
No full text"Fratelli d'Italia": fraternité, sororité et inégalité dans les terminologies de parenté italiennes
No full textL'article propose un'analyse générale des terminologies des siblings, il montre la diffusion géographique des "types" les plus répendus, et montre comment l'utilisation d'une logique fuzzy favorise l'analyse sémantique des terminologies italiennes
210Po in the Gessoso Solfifera Formation of Perticara Mine
No full textThe Perticara sulphur mine is a historically important mine located in the province of Rimini (Italy), known for the large crystals of sulfur that were extracted there, and for the abundance of ore. The mine was developed in the Gessoso-Solfifera Formation, a rock succession mainly formed by gypsum and limestone that is well preserved in the western Romagna Apennines area (Roveri et al., 2003). The Gessoso-Solfifera Formation comprises primary and clastic, resedimented evaporites with interbedded organic-rich shales, which were deposited during the evaporitic and post-evaporitic stages of the Messinian salinity crisis (Roveri et al., 2003). The Perticara mine was active for a few centuries until the mid-twentieth century. In 2016 the mine was re-explored by the Federazione Speleologica Regionale Emilia Romagna and starting from this data various environmental matrices (rocks, minerals, water, air) were sampled over time. Samples of natural epsomite crystals (general formula Mg(SO4)·7H2O), that extensively grow on rock walls and blocks with a fibrous habit, were collected and morphologically and chemically investigated using SEM-EDS, XRPD, ICP-AES and alpha spectrometry measurements.
Most of the fibres are of inhalable size and can be potentially adsorbed from all parts of the respiratory tract. Their solubility and the presence of significant amounts of toxic elements (As, Co, Fe, Mn, Ni, Sr, Ti, Zn) and radioactive isotope 210Po (and to a less extent 228Th) make the inhalation of these fibres potentially hazardous to human health. These preliminary results were recently published by Giordani et al. (2022). Moreover, a significant concentration of 222Rn (238U decay series), as well as CO2 and CO in the air of the mine, could play an important role in the accumulation of 210Po in epsomite, while very few amounts of 210Po were detected in the water springs and pools inside the mine or in host rocks, but further investigation is needed.
Giordani M., Meli M.A., Roselli C., Betti M., Peruzzi F., Taussi M., Valentini L., Fagiolino I. & Mattioli M. (2022) - Could soluble minerals be hazardous to human health? Evidence from fibrous epsomite. Environ. Res., 206, 112579.
Roveri M., Manzi V., Lucchi F.R. & Rogledi S. (2003) - Sedimentary and tectonic evolution of the Vena del Gesso basin (Northern Apennines, Italy): implications for the onset of the Messinian salinity crisis. Geol. Soc. Am. Bull., 115(4), 387-405
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
On the Convergence Time of Federated Learning over Wireless Networks under Imperfect CSI
No full textFederated learning (FL) has recently emerged as an attractive decentralized solution for wireless networks to collaboratively train a shared model while keeping data localized. As a general approach, existing FL methods tend to assume perfect knowledge of the Channel State Information (CSI) during the training phase, which may not be easy to acquire in case of fast fading channels. Moreover, literature analyses either consider a fixed number of clients participating in the training of the federated model, or simply assume that all clients operate at the maximum achievable rate to transmit model data. In this paper, we fill these gaps by proposing a training process that takes channel statistics as a bias to minimize the convergence time under imperfect CSI. Numerical experiments demonstrate that it is possible to reduce the training time by neglecting model updates from clients that cannot sustain a minimum predefined transmission rate. We also examine the trade-off between number of clients involved in the training process and model accuracy as a function of different fading regimes
An efficient requirement-aware attachment policy for future millimeter wave vehicular networks
No full textThe automotive industry is rapidly evolving towards connected and autonomous vehicles, whose ever more stringent data traffic requirements might exceed the capacity of traditional technologies for vehicular networks. In this scenario, densely deploying millimeter wave (mmWave) base stations is a promising approach to provide very high transmission speeds to the vehicles. However, mmWave signals suffer from high path and penetration losses which might render the communication unreliable and discontinuous. Coexistence between mmWave and Long Term Evolution (LTE) communication systems has therefore been considered to guarantee increased capacity and robustness through heterogeneous networking. Following this rationale, we face the challenge of designing fair and efficient attachment policies in heterogeneous vehicular networks. Traditional methods based on received signal quality criteria lack consideration of the vehicle's individual requirements and traffic demands, and lead to suboptim..
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
Appropriate Similarity Measures for Author Cocitation Analysis
Full text linkWe provide a number of new insights into the methodological discussion about author cocitation analysis. We first argue that the use of the Pearson correlation for measuring the similarity between authors’ cocitation profiles is not very satisfactory. We then discuss what kind of similarity measures may be used as an alternative to the Pearson correlation. We consider three similarity measures in particular. One is the well-known cosine. The other two similarity measures have not been used before in the bibliometric literature. Finally, we show by means of an example that our findings have a high practical relevance.information science;Pearson correlation;cosine;similarity measure;author cocitation analysis
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