1,720,971 research outputs found
Siti contaminati e tecnologie di bonifica: la situazione e le prospettive di sviluppo / Contaminated sites and remediation technologies: the present situation and a possible scenario.
No full textPROCESSING OF A HYDROGEOCHEMICAL APPROACH BASED ON THE METHODOLOGIES OF COMPOSITIONAL FINGERPRINTING TO CHARACTERIZE THE CONTAMINATION IN THE ITALIAN SITES.
No full textFingerprinting and Groundwater Model Application to Evaluate Hydraulic Barrier Efficiency (Italy)
No full textRemediation actions at contaminated sites are based on multiple numerical model scenarios considering different parameter
distributions, source positions and contaminant transport paths. In some cases the excess of scenarios is due to uncertainties in the
conceptual model as a result of the spread of contamination through heterogeneities in the physical system. Reduction of project
hypotheses and conceptual model uncertainty is therefore needed. This result can be achieved by coupling hydrogeological
investigations with environmental forensic techniques, better localization of the source and understanding of contamination history.
In this respect, in the present study, compositional fingerprinting and groundwater flow modeling were applied to a former oil
storage facility where, even though a hydraulic barrier had been built to stop the hydrocarbon plume, the presence of some
hydrocarbons was still found in downgradient monitoring wells. The final aim was to evaluate the efficacy of the hydraulic barrier
and identify of the source of pollution. Fingerprinting results indicated pollution with a gasoline-diesel mixture much altered by
water washing and/or biodegradation. Comparison of seven groundwater samples collected in wells and monitoring wells was
performed by analyzing the volatile fraction (BTEX) and the total ion chromatogram (TIC), focusing attention on: n-alkanes
(m/z 85), alkylcyclohexanes (m/z 83), isoprenoids (m/z 113), C4-alkylbenzenes (m/z 134), C3-C6 alkylbenzenes and polycyclic
aromatic hydrocarbons (PAHs). The most probable scenario was then identified by combining the results of fingerprinting with
different contaminant paths obtained using the numerical model
Multidisciplinary approach for the characterization of sites contaminated by hydrocarbons
No full textAPPLICATION OF COMPOSITIONAL FINGERPRINTING TO AN ITALIAN SITE CONTAMINATED BY HYDROCARBONS
No full textDealing with complex contamination: A novel approach with a combined bio-phytoremediation strategy and effective analytical techniques
No full textPhytoremediation is a sustainable technology capable of efficiently removing low or moderate contamination. However, complex pollution conditions can drastically reduce efficiency, as plants can show themselves sensitive to organic contaminants, growing slowly and thus impairing metals' absorption. In cases where the action of indigenous bacteria degrading hydrocarbons and promoting plant growth is not sufficient, more sophisticated strategies are necessary.
This investigation aims to evaluate the effectiveness of a train of technologies that sees advanced phytoremediation in combination with other biological approaches to remediate soil from a disused industrial area contaminated by N-containing compounds, alkyl aromatic hydrocarbons, copper, and nickel. In particular, a stepwise procedure was used with a pre-treatment (landfarming and bioaugmentation), significantly affecting the soil's fertility, increasing germinability up to 85%, and allowing the plants to extract the metals adequately. Furthermore, with EDTA as a mobilizing agent, nickel absorption has increased up to 36% in Helianthus annuus and up to 88% in Zea mays. For copper, an increase of up to 262% in Helianthus annuus and up to 202% in Zea Mays was obtained. Analysis through Fourier-Transform Ion Cyclotron Resonance Mass Spectrometry highlighted the biodegradation of some of the N-containing compounds recording, after phytoremediation, a decrease of up to almost 90%. Metagenomic analysis of the soil showed a typical microbial population of oxidizing hydrocarbon strains with a prevalence of the Nocardiaceae family (43%). The results obtained appear to confirm the usefulness of the approach developed, and the employed cutting-edge analytical techniques allowed a top-notch characterization of the remediation scenario
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
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