4,682 research outputs found
Aspetti geofisici ed evoluzione ambientale dell’area portuale di Terracina (Lt)
No full textNell'ambito del progetto "MERCATOR" è stata effettuata una prospezione microgravimetrica, nel territorio di Terracina (LT), nella zona del porto-canale dell'attuale centro abitato e nelle immediate vicinanze, al fine di individuare le infrastrutture di epoca antica legate alla viabilità marittima dell'area portuale.Published159-175, Tavole LXVI-LXVII-LXVIII-LXIX-LXX-LXXI, 195-2003SR. AMBIENTE - Servizi e ricerca per la Società1VV. Altr
Indagini geofisiche per l'individuazione di aree a rischio sinkhole nella piana di San Vittorino (Ri).
No full textLa matrice di sostenibilità come strumento di supporto alle decisioni: il sistema della portualità turistica di Massa Lubrense
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Enrichment and characterization of Diesel hydrocarbons degrading bacteria from the microbial source Enzyveba
No full textThe stable consortium of aerobic and anaerobic bacteria and fungi Enzyveba produced by Marcopolo Engineering S.p.A. (Italy) was recently found to significantly intensify the biological remediation of Diesel, PCB and PAH -contaminated soils (1), thus representing a promising inoculum for the bioremediation of polluted soils lacking indigenous active specialized biomass. In this work, Enzyveba’s bacteria able to degrade Diesel hydrocarbons were enriched through five cycles of enrichment cultures in liquid mineral medium with Diesel or Blue Diesel (1000 ppm) as the sole source of carbon and energy. The enriched cultures displayed a similar degradation pathways and potential towards Diesel and Blue Diesel hydrocarbons, which were removed by 62% and 70% after three days of incubation under shaken flask batch aerobic conditions. Accordingly, a remarkable biomass growth (from 106 to 109 CFU/ml) was detected during the incubation. From each culture seven isolates were obtained which are currently under biochemical and molecular characterization.
(1) Di Toro S., Zanaroli G., Fava F. Microbial Cell Factories. 2006; 5:11
Earthquake source properties from pseudotachylite
No full textEarthquake-radiated motions contain in formation that can be interpreted as source displacement and therefore related to stress drop. Except in a few notable cases, these displacements cannot be easily related to the absolute stress level, the fault strength, or attributed to a particular physical mechanism. In contrast paleo-earthquakes recorded by exhumed pseudotachylite have a known dynamic mechanism whose properties constrain the co-seismic fault strength. Pseudotachylite can be used to directly address a discrepancy between seismologically-measured stress drops, which are typically a few MPa, and much larger dynamic stress drops expected from thermal weakening during slip at seismic speeds in crystalline rock [Sibson, 1973; McKenzie and Brune, 1969; Lachenbruch, 1980; Mase and Smith, 1986; Rice, 2006] as have been observed in laboratory experiments at high slip rates [Di Toro et al., 2006a]. This note places pseudotachylite-derived estimates of fault strength and inferred crustal stress within the context and bounds of naturally observed earthquake source parameters: apparent stress, stress drop, and overshoot, including consideration of fault surface roughness, off-fault damage, fracture energy, and the 'strength excess'. The analysis, which assumes stress drop is related to corner frequency by the Madariaga [1976] source model, is restricted to earthquakes of the Gole Larghe fault zone in the Italian Alps where the dynamic shear strength is well21constrained by field and laboratory measurements. We find that radiated energy is similar to or exceeds the shear-generated heat and that the maximum strength excess is ~16 MPa. These events have inferred earthquake source parameters that are rare, for instance a few percent of the global earthquake population has stress drops as large, unless: fracture energy is routinely greater than in existing models, pseudotachylite is not representative of the shear strength during the earthquake that generated it, or unless the strength excess is larger than we have allowed
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