1,721,032 research outputs found
Biocides electrogeneration for a zero-reagent on board disinfection of ballast water
No full textThe feasibility of a quick electrochemical process for on board zero-reagent treatment of ballast water by anodic and cathodic production of oxidants was proposed. The process has been tested in the inactivation of the marine dinoflagellates Alexandrium minutum and A. taylori, both responsible for algal blooms and toxin-producing, and against the marine bacterium Pseudomonas aeruginosa, a Gram-negative pathogenic micro-organism. A complete inactivation of both dinoflagellates was quickly achieved with electro-generated active chlorine, while higher resistance to oxidising agents was verified for P. aeruginosa. A combined sequential treatment involving anodic oxidation followed by extended exposure time in the absence of current, and a final cathodic treatment was proposed. The cathodically electro-generated hydrogen peroxide contributed to the reduction of treatment time and the removal of residual species. © 2012 Springer Science+Business Media Dordrecht
From polluting seafood wastes to energy. production of hydrogen and methane from raw chitin material by a two-phase process
No full textHydrogen is a clean energy carrier having great potential as alternative fuel. Despite its well-established production, by chemical/electrochemical processes, bio-conversion of organic wastes to hydrogen could be a sustainable alternative since the afore-mentioned methods require a lot of energy. Anaerobic digestion to bio-methane is considered a winning strategy to transform wastes into energy with reduction of environmental issues. Chitin is the second most abundant polysaccharide after cellulose. Huge amounts of chitinous wastes, produced from seafood industry and fungal fermentation plants, represent source of pollution if improperly disposed. In this paper the feasibility to obtain hydrogen and methane in a two-phase anaerobic bio-process using raw chitin was investigated. After a preliminary aerobic pre-hydrolysis, carried out by the chitinolytic fungus Lecanicillium muscarium CCFEE 5003, H2, was obtained by dark fermentation and CH4, subsequently, by further digestion. For best productions, pre-hydrolysis was optimised by response surface methodology. Highest hydrogen (147 ml/1) and methane (7713 ml/1) levels were obtained after 24 days of dark fermentation and 83 days of digestion, respectively. However, best productivities were obtained at day 14 and 30 for H2, and CH4, respectively. This work is the first attempt to use raw chitin to obtain these biofuels by dark fermentation and anaerobic digestion
Self-fermentation: Innovative pretreatment for use high concentration of olive mill wastewater in anaerobic digestion plant
No full textThis study aimed to evaluate the impact of self fermentation on methane production as biological pretreatment of olive mill wastewater (OMW). The self-fermentation was carried out at room temperature without mixing and at natural light cycle. The batch assays were performed at the influent substrate concentration of 36.7 g VS/l (OMW 100%), 18,4 g VS/l (OMW 50%) and 9.2 g VS/l (OMW 25%). The methane production was performed at 37°C in mixing condition. The results of methane production were compared with those obtained using untreated OMW. The results of this study showed that the self fermentation process is a very effective pretreatment to produce methane. Only the self-fermented samples have produced methane from undiluted OMW and a maximum cumulative methane production of 7583 ± 138 mlCH4/L and a yield of 246 ± 10 mlCH4/ gVS were obtained. A yield increase of +13.5% at OMW dilution of 50% was also achieved as compared to untreated OMW results. Interestingly, in the anaerobic digestion of untreated OMW, high hydrogen yields, with an average value of 46.8 ± 1.9 mlH2/gVS, were obtained. Moreover a depletion around 20% v/v of polyphenols was recorded for all experimental set. © 2016 ETA-Florence Renewable Energies
Studio degli accumuli di detrito organico sui fondali del lago di Nemi: Nota II - Rapporti nella biomassa stabile.
No full textA nonlinear, data-driven, ANNs-based approach to culture-led development policies in rural areas: The case of Gjakove and Pee districts, Western Kosovo
Full text linkWe develop a computational approach to the analysis of cultural vibrancy and to the role of the cultural and cre-ative sectors in the socio-economic organization of two districts of Western Kosovo, Gjakove and Pee. Our anal-ysis is built on a geolocalized mapping of the cultural activities and facilities, and on the main socio-economic variables for the two districts, and makes use of innovative data analysis techniques: Theory of Impossible Words (TIW), the Topological Weighted Centroid (TWC), and the AutoCM ANN. We find that the dynamics of cul-tural vibrancy of the territory is mainly driven by the competing attraction pulls of the nearby countries of Serbia and Albania, that also form the region's main and often conflicting ethnicities, and that such dynamics are likely to further polarize in the future. We also find that the cultural system plays a marginal role in the territory's socio-economic organization. This situation makes a case for a more active role of cultural policy in shaping future local developmental models in rural areas and in acting as an agent of social cohesion.(c) 2022 Elsevier Ltd. All rights reserved
Nicchia trofica e sue componenti di ampiezza in una popolazione di Palaemonetes antennarius (H.Milne-Edwards) (Crust. Decapoda)
No full textWind Tunnel Measurements of the Aerodynamic Coefficients of Some Airfoil Sections for Wind Turbine Blades, Extended to High Angles of Attack: Apparatus, Method and Results
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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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