Using the Fisher–Shannon method to characterize continuous seismic signal during volcanic eruptions: application to 2011–2012 El Hierro (Canary Islands) eruption     

Luciano Telesca  Michele Lovallo  Joan Martì Molist  Carmen López Moreno  Rafael Abella Meléndez 《地学学报》2014,26(6):425-429

We investigated the dynamics of the continuous seismic signal recorded before and during the 2011–2012 El Hierro eruption (Canary Islands) using the innovative approach of the Fisher–Shannon method, a suitable statistical tool for detecting dynamic changes in complex systems. Our findings identify dynamic changes in the seismic signal that can be correlated with different stress states of the magmatic setting and the plumbing system in the volcano at El Hierro. The results contribute to the understanding of the fracturing pattern in the crust during a new intrusion and eruption of an overpressurized batch of magma.  相似文献   

No evidence for widespread bird declines in protected South American forests     

Philip C Stouffer  Kristina L. Cockle  Alexandre Aleixo  Juan I. Areta  Juan Mazar Barnett  Alejandro Bodrati  Carlos Daniel Cadena  Adri��n S. Di Giacomo  Sebastian K. Herzog  Peter Hosner  Erik I. Johnson  Luciano N. Naka  C��sar S��nchez 《Climatic change》2011,108(1-2):383-386

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Gillnet fisheries as a major mortality factor of Magellanic penguins in wintering areas     

Cardoso LG  Bugoni L  Mancini PL  Haimovici M 《Marine pollution bulletin》2011,62(4):840-844

The incidental capture in fisheries is probably the main conservation problem affecting seabirds. While the capture of albatrosses and petrels on longline hooks is well-known worldwide, the bycatch of diving seabirds in gillnets is an overlooked conservation problem. During a winter coastal fishing trip, the capture of Magellanic penguins (Spheniscus magellanicus) was recorded in driftnet and bottom setnet fisheries for the first time in southern Brazil. The highest captures rates were found in driftnets, from 146.5 to 545.5 penguins/km² of net and a total of 56 dead penguins were recorded. In the bottom gillnet, a total of 12 birds were killed and the capture rates varied from 41.7 to 125.0 penguins/km² of net. Although preliminary, the results presented in this paper were consistent between sets. If we consider the magnitude of driftnet and setnet fishing fleets, and that most dead penguins were adults, the impact upon Magellanic penguin populations is probably significant.  相似文献   

Artificial macrophytes as fish habitat in a Mediterranean reservoir subjected to seasonal water level disturbances     

Luciano N. Santos  Angelo A. Agostinho  Carles Alcaraz  Joaquim Carol  Alejandra F. G. N. Santos  Pablo Tedesco  Emili García-Berthou 《Aquatic Sciences - Research Across Boundaries》2011,73(1):43-52

Artificial macrophytes were experimentally deployed in Boadella Reservoir (NE Spain) and assessed for fish use throughout the first 3 months of the 2007 summer drawdown. In total, 1,832 individuals of seven fish species were recorded through visual censuses, with introduced perch Perca fluviatilis being the prevalent species. Fish richness and abundance were significantly higher in artificial macrophytes than in rocky shores and sandy beaches, displaying a unimodal variation through time. P. fluviatilis, Rutilus rutilus and Abramis brama were significantly more abundant in artificial macrophytes than in the other two naturally submersed habitats, where no individuals of these species were recorded. The abundances of Squalius laietanus, Lepomis gibbosus, Micropterus salmoides and Cyprinus carpio were overall greater in artificial macrophytes than in rocky shores but displayed significant habitat × time interactions. A decrease in predation risk was apparently the key-factor of the intensive use of artificial macrophytes by small fish (≤100 mm TL) in Boadella Reservoir, since most species reduced drastically or completely the use of submerged structures when body size increased. This study demonstrates that adding artificial structures mimicking aquatic macrophytes can be an interesting tool to mitigate the adverse effects of water level fluctuations on fish assemblages in structure-less and homogeneous ecosystems, and to understand the mechanisms affecting habitat use and species replacement.  相似文献   

A wastewater treatment using a biofilm airlift suspension reactor with biomass attached to supports: a numerical model     

P. Viotti  A. Luciano  G. Mancini  V. Torretta 《International Journal of Environmental Science and Technology》2014,11(3):571-588

A mathematical model of the biological process occurring in a modified biofilm airlift suspension reactor is presented. When compared with a traditional wastewater treatment plant, a biofilm airlift suspension process has major advantages, such as higher oxygen levels in the bulk fluid and lower space requirements. The limited volumes obtained with this technique generally do not allow to reach the high times of contact required for an efficient removal of nitrogen that normally are characterized by a slower kinetics than carbonaceous compounds. To avoid this problem, supports for attached biomass growth were inserted in the reactor. Both physical and biological aspects were incorporated into the presented model to simulate the removal processes of the substrates. A sensitivity analysis was performed, and the model was validated using experimental results obtained at a lab-scale plant. This model can accurately estimate the removal rate in different boundary conditions providing the details of the water quality profiles through the reactor and in the attached biomass. The model thus represents a valid aid for design purposes and for the management of treatment plants that use these uncommon reactors. The model also provides the required hydraulic retention time for a complete nitrification and the appropriate recirculation ratio. The results have shown the full-scale applicability of this treatment due to its efficiencies coupled to the advantages of its low impact, low space requirement and low sludge production.  相似文献   

Visual analytics for diagnosing spatial interpolation models     

André de Oliveira Bastos  Emanuele Santos  Darniton Viana  Luciano Barbosa 《Transactions in GIS》2023,27(2):364-387

The development and widespread use of statistical learning models have brought the need for tools that help analysts diagnose, build, and refine those models. In this work, in particular, we focus on interpolation models, which spatially predict the value of a variable based on the values of its neighborhood. Investigating these results spatially or comparing them with other models at different levels of granularity is still a challenge for the analysts trying to understand and refine their models. To deal with that, we propose a visual analytics model-agnostic tool for facilitating the comparison and refinement of spatial models at different levels of granularity using interactive visualization techniques. The tool was built in collaboration with specialists who used it to diagnose and improve a spatial model for predicting residential real estate prices.  相似文献   

List of papers from other journals     

Luciano Baresi  Sebastiano Colazzo  Luca Mainetti  Sandro Morasca 《Solar physics》1992,140(2):397-410

List of papers from other journals  相似文献   

List of papers from other journals     

Luciano Baresi  Sebastiano Colazzo  Luca Mainetti  Sandro Morasca 《Solar physics》1991,135(1):199-209

List of papers from other journals  相似文献   

Investigating prediction performance of an artificial neural network and a numerical model of the tidal signal at Puerto Belgrano, Bahia Blanca Estuary (Argentina)     

Jorge O. Pierini  Michele Lovallo  Luciano Telesca  Eduardo A. Gómez 《Acta Geophysica》2013,61(6):1522-1537

In the present study we compare performances of the prediction of hourly tidal level variations at Puerto Belgrano, a coastal site in the Bahia Blanca Estuary (Argentina), by means of the MOHID model, which is a numerical model designed for coastal and estuarine shallow water applications, and of an artificial neural network (ANN). It was shown that the ANN model is able to predict the hourly tidal levels over long term duration with at least seven days of observations and with a better performance in respect to the numerical model. Our findings can be useful to implement ANN-based tools for future studies of the hydrodynamics of Bahía Blanca estuary.  相似文献   

Fractal approaches in investigating the time dynamics of self-potential hourly variability     

Luciano Telesca  Gerardo Colangelo  Vincenzo Lapenna  Maria Macchiato 《International Journal of Earth Sciences》2005,94(2):285-300

Fractal tools have been used to investigate the time dynamics of hourly self-potential data, recorded during the year 2001 by five geoelectrical stations located in one of the most seismic areas of southern Italy. Scaling behaviour has been revealed by means of different statistics: the Lomb Periodogram method, the Detrended Fluctuation Analysis, the Higuchi analysis and the mean distance spanned within the time L. The values of the scaling exponents estimated by means of these methods indicate that the temporal fluctuations of the geoelectrical signals are not typical of purely random stochastic processes (i.e. white noise), but evidence the presence of long-range correlations. Furthermore, it is found that these correlations are linear.  相似文献