169,920 research outputs found
Decadal Migration of Dome C Inferred by Global Navigation Satellite System Measurements
No full textUnderstanding the behaviour of domes under both contemporary and historical environmental conditions is essential to facilitate the study of dome-divide dynamics and the interpretation of ice core records. This paper presents nearly 20 years of GNSS observations at Dome C in East Antarctica, focusing on ice velocity and accumulation rates. The 38 measuring poles established in 1996 for the EPICA Dome C project were surveyed three times in 18 years. The data analysis indicates alterations in ice velocity patterns, including a horizontal velocity shift across the dome and a dynamic summit migration of about 100 m a-1. Specifically, increases in velocity on the southeastern slope were counterbalanced by a similar reduction in the northwestern sector. These changes are likely related to variations in accumulation distribution as indicated by snow radar measurements and shifts in the drainage basin of the Byrd Glacier. Furthermore, a 10% alteration in snow accumulation rates at Dome C over the past decade compared with previous centuries was observed, accompanied by an elevation increase of about 3.5 mm a-1. The recent findings of the BE-OI project highlight the minimal perturbations of the climate signal on the ice core, attributable to glaciological variability at the dome position
Comparison among hydrogen peroxide advanced oxidation processes for the treatment of industrial wastewaters
No full textImpianti sperimentali di fitodepurazione al servizio di piccole comunità nello stato di Bahia, Brasile
No full textAtti del Convegno Internazionale. Varese, 23-24 ottobre 200
Rischio sanitario dello smaltimento incontrollato di rifiuti urbani
No full textUna gestione pluriennale non sempre corretta dell’intero ciclo dei RSU e dei rifiuti speciali e le pratiche illegali legate a queste attività hanno provocato in Campania una crisi ambientale che si è cronicizzata per oltre un decennio, con esacerbazioni tali da far temere ripercussioni sulla salute della popolazione esposta.
A seguito della segnalazione, in uno studio epidemiologico del 2004, di un eccesso di rischio per alcune patologie tumorali in tre comuni campani caratterizzati da una forte concentrazione di siti di smaltimento legale e illegale di rifiuti, sono stati effettuati alcuni studi di grande rilevanza per valutare l’impatto sanitario del trattamento dei rifiuti in Campania. Sono stati analizzati e correlati i fattori di rischio con gli esiti dell'indagine sanitaria
Spatial and temporal variability of surface mass balance near Talos Dome, East Antarctica
No full textCalculating specific denitrification rates in pre-denitrification by assessing the influence of dissolved oxygen, sludge loading and mixed-liquor recycle
No full textThis article presents the results of an experimental study on the correlation among the specific denitrification rate (SNDR), the dissolved oxygen concentration (DO), the F:M ratio (F:M) and the mixed-liquor (ML) recycle in the pre-denitrification reactors fed by domestic sewage. The experimental curves reveal a 28.8-32.0% reduction in the SDNR at 20 °C (SDNR20°C) with DO equal to 0.1 mgO2 L-1 and F:M in the range 0.2-0.4 kgBOD5 kgMLVSS-1 d-1 . The SNDR reduction increases to 50.0-55.9% with DO = 0.3 mgO2 L-1. A mathematical correlation of these results and an equation for calculating SDNR20°C as function of the F:M as well as the average DO and BOD5 in the total flow-rate fed in the denitrification stage are proposed. The conducted experience gives useful suggestions for practical usage, in particular regarding the denitrification reactor design, and represents a good starting point for future applications with the aim to optimize the biological process in domestic sewage treatment plants
Going Beyond Counting First Authors in Author Co-citation Analysis
No full textThe 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
Five subglacial lakes and one of the Antarctica's thickest ice covers newly determined by radio echo sounding over the Vostok DomeC region
No full textRadio echo sounding (RES) measurements were collected from 1995 to 2003 during Italian Antarctic expeditions over the Vostok-Dome C region. The data collected allow for the reconstruction of a bedrock elevation map between the Belgica Highlands and the Aurora Subglacial Basin (112.0° - 124.0° E; 74.0° - 78.0° S). Moreover, analysis of the RES data has revealed one of the thickest ice covers in Antarctica (4755 ± 16 m; 118.321° E, 76.059° S) as well as five new subglacial lakes
GPR as an effective tool for safety and glacier characterization: experiences and future development
No full textIn recent times, the GPR technique has assumed an important role in glacial environment exploration. Ice thickness, bedrock description, internal water floods or underground channel, glacial structures (as snow layering and crevasses detection) form part of our experience in Antarctica and in high alpine glacier ski areas. In this paper, we present some results of these investigations exploring the possibility of combining our technical expertise on Radio Echo Sounding (RES) instrumentation to develop a system for subglacial environment exploration.Published1-61.8. Osservazioni di geofisica ambientale3.8. Geofisica per l'ambienteN/A or not JCRrestricte
Sustainable biofuels for rural areas of developing Countries
No full textThe Authors have been, for several years, involved in international cooperation development projects. Within these activities, they have developed different initiatives concerning planning aspects and plant realizations related to biofuels application to rural areas. Most of these projects are concerned with the production of renewable energies to meet the power needs of rural isolated communities, and among these the production of biofuels from biomass. These projects, regarding sustainable development in energy production and economic self-sufficiency, partly already realized and partly currently in progress, are located in Africa and Brazil
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