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Search Results: 1 - 10 of 462740 matches for " A. Marino "
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Numerical Simulation of Pesticide Transport and Fate for Water Management in the Fucino Plain, Italy  [PDF]
Journal of Water Resource and Protection (JWARP) , 2010, DOI: 10.4236/jwarp.2010.21004
Abstract: A three-phase pesticide transport model is used to verify by numerical simulation, the influence of different parameters on infiltration through soil and/or surface runoff processes. Simulations are performed for a typical sandy loam potato field of Italy’s Fucino Plain, to explain the occurrence of measured concentrations of pesticides (mainly Linuron) in both surface waters and groundwater. Simulations take into account agricultural practices, climatic conditions, and soil characteristics. Results focus on the role of rainfall events and irrigation, of related infiltration amount and distribution, and of root zone thickness in influencing pesticide fate and its possible concentration increase through the years. Modeling results positively fit with the background knowledge of the Plain hydrology, showing the prevalence of surface transport and a scarce possibility for pesticides to reach groundwater in an average rainfall/irrigation scenario. Meanwhile, specific water management strategies are suggested to limit the occurrence of local groundwater pollution, related to high aquifer vulnerability zones, controlling inappropriate irrigation and pesticide application.
Anomalous globular clusters: insights from neutron capture elements abundances
A. F. Marino
Physics , 2013,
Abstract: Thanks to the large amount of spectroscopic and photometric data assembled in the last couple of decades, the assumption that all globular clusters (GCs) contain a simple mono-metallic stellar population has been modified. Besides the common variations in the elements created/destroyed in the H-burning processes, spreads and/or multi-modalities in heavier elements have been detected in a few objects. Among the most remarkable chemical inhomogeneity in these anomalous objects is the internal variation in the neutron-capture (n-capture) elements, that can provide some information about the material from which stars were born. I report a summary of the chemical pattern observed in GCs where variations in n-capture have been detected, and the connection between these chemical features and the distribution of stars along the color-magnitude diagrams in the context of the lively debate on multiple stellar populations.
Geophysical turbulence and the duality of the energy flow across scales
A. Pouquet,R. Marino
Physics , 2013, DOI: 10.1103/PhysRevLett.111.234501
Abstract: The ocean and the atmosphere, and hence the climate, are governed at large scale by interactions between pressure gradient, Coriolis and buoyancy forces. This leads to a quasi-geostrophic balance in which, in a two-dimensional-like fashion, the energy injected by solar radiation, winds or tides goes to large scales in what is known as an inverse cascade. Yet, except for Ekman friction, energy dissipation and turbulent mixing occur at small scale implying the formation of such scales associated with breaking of geostrophic dynamics through wave-eddy interactions \cite{ledwell_00, vanneste_13} or frontogenesis \cite{hoskins_72, mcwilliams_10}, in opposition to the inverse cascade. Can it be both at the same time? We exemplify here this dual behavior of energy with the help of three-dimensional direct numerical simulations of rotating stratified Boussinesq turbulence. We show that efficient small-scale mixing and large-scale coherence develop simultaneously in such geophysical and astrophysical flows, both with constant flux as required by theoretical arguments, thereby clearly resolving the aforementioned contradiction.
Recovery of fluctuation spectrum evolution from tomographic shear spectra
Silvio A. Bonometto,Marino Mezzetti
Physics , 2013, DOI: 10.1088/1475-7516/2013/05/008
Abstract: Forthcoming large angle surveys are planned to obtain high precision tomographic shear data. In principle, they will allow us to recover the spectra of matter density fluctuation, at various redshift, through the inversion of the expressions yielding shear from fluctuation spectra. This was discussed in previous work, where SVD techniques for matrix inversion were also shown to be the optimal tool to this aim. Here we show the significant improvements obtainable by using a 7 bin tomography, as allowed by future Euclid data, as well as the question of error propagation from shear to fluctuation spectra. We find that the technique is a promising tool, namely for the analysis of baryon physics throug high-l shear spectra and to test the consistency between expansion rate and fluctuation growth.
Rainfall-triggered landslides, anthropogenic hazards, and mitigation strategies
A. Rinaldini, A. Marino,M. Ciucci
Advances in Geosciences (ADGEO) , 2008,
Abstract: This paper describes multidisciplinary investigations carried out in the urban centre of Celano, a small town located at the northern edge of the Fucino Basin (Central Italy). The town lies upon a wide debris body that was recognized in this study as a rock avalanche deposit estimated to date to the Holocene. Geomorphologic studies and geophysical investigations led to a detailed characterization of the landslide deposit and the surrounding units. The information obtained was used to assess the vulnerability of the Celano municipal area, by evaluating the stability of the landslide body and the behaviour of its lithologies under seismic loads.
Effective cosmological "constant " and quintessence
R. de Ritis,A. A. Marino
Physics , 2000, DOI: 10.1103/PhysRevD.64.083509
Abstract: In this paper we present exactly solved extended quintessence models; furthermore, through a dynamical effective Q-cosmological "constant", we recover some of the L decaying cases found in the literature. Finally we introduce a sort of complementarity between the Q-dominated or L-dominated expansions of the Universe.
Numerical model of steel slab reheating in pusher furnaces
Marino,P.; Pignotti,A.; Solís,D.;
Latin American applied research , 2002,
Abstract: the difficulty in measuring load temperatures inside reheating gas furnaces may be circumvented by appropriate use of on-line numerical models. in this article we describe a model of pusher furnaces, used to reheat steel slabs. the model uses thermocouple measurements at fixed positions inside the furnace to calculate the temperature of the combustion products, and takes into account radiative exchanges among those gases, the furnace refractories and the load. a good correlation is found between a temperature profile measured after the slab leaves the roughing stands and the results of the numerical calculations. we conclude that the model is a powerful tool to monitor the thermal state of the load inside the furnace and is suitable, together with an appropriate control algorithm, to automatically calculate the furnace settings required ensuring the objectives of the heating process.
Control of pusher furnaces for steel slab reheating using a numerical model
Marino,P.; Pignotti,A.; Solis,D.;
Latin American applied research , 2004,
Abstract: steel slabs are reheated in pusher-type furnaces up to a temperature of 1200oc in the steel sheet manufacturing process. in this article we describe a control system that uses an on-line numerical model to calculate the furnace setpoints in order to improve the heating quality. examples of actual furnace operation with and without the system are presented to show the improvements that are obtained handling typical non-stationary situations.
Secondary bilateral synchrony associated to a parasagittal tumor case report
Cukiert, A.;Gronich, G.;Marino Jr., R.;
Arquivos de Neuro-Psiquiatria , 1991, DOI: 10.1590/S0004-282X1991000300018
Abstract: a 32 years old woman who had postural limbic and primarily generalized tonic-clonic seizures since the age of 11 presented to us with a ct image strongly suggestive of a mesial meningeoma near the right cingulum. her ictal eeg pattern was characterized by regular 1.5-2.0 hz sharp and slow wave complexes. a right craniotomy was performed under general anesthesia and intraoperative electroencephalographic and electrocorticographic recordings were obtained by means of scalp steel electrodes and modified cerebellar stimulation electrodes, respectively. these recordings demonstrated that surface spikes were often independent from the electrocorticographically recorded ones. before tumor excision, electrical stimulation of the peritumoral mesial cortex resulted in an increase in the epileptic activity. the stimulation of the cavity left after tumor excision led to a prolonged electrographic seizure and neurophysiological procedures were stopped. post-operatively, the patient has remained seizure free for 6 months and her eeg was normal. the pre-, intra- and post-operative findings in this case suggest that the gliotic peritumoral mesial cortex was at least involved in the epileptogenic process.
Garcés,Paula A.; Marino,Alvaro;
Revista Colombiana de Química , 2009,
Abstract: thick films (≥ 1 μm) of yba2cu3o7-δ were deposited by the dip-coating method on mgo (100) substrates at room temperature. after that, superconducting films were obtained by using the melt-annealing method with different thermal treatments. these films showed both different crystalline orientations and critical current densities (jc). additionally the thick films displayed superconducting transitions (tc) around 89.5 k and critical current densities ≥ 2x104 a/cm2 at 77 k and 0t. the highest tc and jc values achieved were attributed mainly to the higher oxygen content and the growth of larger grain sizes as determined by xrd and sem analysis respectively.
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