1,721,070 research outputs found
Modified polyaminic additives against the carbonation of portland concrete and corrosion of reinforcing steel bars
No full textInquinamento elettromagnetico
No full textNella vita quotidiana siamo circondati da radiazioni elettromagnetiche emesse dall'ambiente, dagli impianti elettrici, dalla radio, dalla televisione, dai sistemi medici e dai dispositivi di telecomunicazione (telefoni cellulari, sistemi Wi-Fi, etc.). L’uso comune dell’energia elettrica e soprattutto dei dispositivi digitali legati alle ICT (Information and Communication Technologies) immergono tutti noi in campi elettromagnetici, che sono indispensabili per il corretto funzionamento di tutta una serie di strumenti, divenuti ormai di comune utilizzo.
E’ immediata, dunque, la comprensione della rilevanza del tema e, quindi, la necessità di tenere conto di eventuali conseguenze di natura ambientale (in particolare per la salute umana): se da un lato, infatti, non è più possibile fare a meno di utilizzare determinate tecnologie ed è necessario, quindi, accettare la presenza di campi elettromagnetici, dall’altro è altrettanto necessario considerare le conseguenze sull’ambiente e soprattutto sugli esseri umani.
Questo capitolo nell' ambito più generale della Medicina Ambientale, vuole dare un contributo riguardo a valutazione delle possibili patologie connesse con l' esposizione ai campi elettromagnetici e dare dei suggerimenti riguardo i limiti di esposizione con particolare riferimento alla tecnologia 5G
An updated report on the water chemistry of the lakes of central Italy.
No full textAlbano, Bolsena and Bracciano are the most important lakes in Central Italy; the
relevance and the potential vulnerability of these lakes is enhanced by their location in a
populous area, with a high water demand for agriculture and other public uses. The
waters of Lake Bracciano are already utilized for drinking supply to the city of Rome.
The aim of this paper is to update the information on the water chemistry of these
lakes, on the basis of samplings carried out by the authors; moreover experimental data
are compared with similar analyses available from the literature.
Besides the mass hydraulic balance of the lake system, the whole volcanic basin was
considered and data related to the period 2000-2005 were also highlighted
L'architettura nascosta: il Teatro della Compagnia, 1984-87 Firenze
No full textPresentazione del progetto di Adolfo Natalini il Teatro della Compagnia, nuova sede del Teatro Regionale Toscano a Firenze
Influence of gaseous atmosphere during a thermal process for recovery of manganese and zinc from spent batteries
No full textThe aim of the work is the recovery by thermal treatment of manganese and zinc from a mixture of zinc-carbon and alkaline spent batteries, due to the different phase change temperatures of the metals. Activated charcoal, as a reductant of the zinc-bearing phases to metallic Zn, was added to the mixture that was heated in different atmospheres (air, nitrogen, carbon dioxide) at different temperatures and residence times. Characterization of the mixture and of the residues of thermal treatment was carried out by chemical analysis, thermogravimetric and differential thermal analysis, scanning electron microscope and X-ray diffraction and allowed to understand the mechanisms of reduction of zinc and to interpret the formation of different compounds during the process. Results show that recovery of 99% of Zn (grade 96%) at 1200 C and 97% of Zn (grade 99%) at 1000 C, are achieved in N2 at 30 min residence time. Recovery of Mn at 1200 C and 30 min residence time was around 90-100% (90% grade). These products are suitable, after refining, for production of new batteries or higher value-added products. The residue of the treatment, enriched in manganese oxide, could be used in the production of iron-manganese alloys. © 2013 Elsevier B.V. All rights reserved
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
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