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Search Results: 1 - 10 of 7626 matches for " Antonino Cala' Lesina;Alessandro Vaccari;Alessandro Bozzoli "
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A Novel RC-FDTD Algorithm for the Drude Dispersion Analysis
Antonino Cala' Lesina;Alessandro Vaccari;Alessandro Bozzoli
PIER M , 2012, DOI: 10.2528/PIERM12041904
Abstract: One of the main techniques for the Finite-Difference Time-Domain (FDTD) analysis of dispersive media is the Recursive Convolution (RC) method. The idea here proposed for calculating the updating FDTD equation is based on the Laplace transform and is applied to the Drude dispersion case. A modified RC-FDTD algorithm is then deduced. We test our algorithm by simulating gold and silver nanospheres exposed to an optical plane wave and comparing the results with the analytical solution. The modified algorithm guarantees a better overall accuracy of the solution, in particular at the plasmonic resonance frequencies.
Parallel Implementation of a 3D Subgridding FDTD Algorithm for Large Simulations
Alessandro Vaccari;Antonino Cala' Lesina;L. Cristoforetti;R. Pontalti
PIER , 2011, DOI: 10.2528/PIER11063004
Abstract: In a previous paper, we proposed and tested a robust and efficient three-dimensional (3-D) subgridding algorithm for the FDTD solution method of the Maxwell's curl PDEs system. Its characteristic feature is the straight, non-recursive, embedding of Yee grids - refined by factors of 3, 5, 7 and even larger - within coarser ones. There, the algorithm's implementation was described with the traditional serial programming approach. In the present paper, we propose and test its parallel programming implementation. The goal is to make it suitable and efficient for large scale electromagnetic simulations.
Asymmetric Ruthenium(II) and Osmium(II) Complexes with New Bidentate Polyquinoline Ligands. Synthesis and NMR Characterization
Antonino Mamo,Alessandro Aureliano,Antonino Recca
Molecules , 2010, DOI: 10.3390/molecules15031324
Abstract: A series of Ru(II) and Os(II) tris-chelate complexes with new bidentate 2-pyridylquinoline ligands have been synthesized and fully characterized by EA,1H-NMR and FAB-MS techniques. The new ligands are: L1 = 4-p-methoxyphenyl-6-bromo-2-(2′- pyridyl)quinoline (mphbr-pq) and L2 = 4-p-hydroxyphenyl-6-bromo-2-(2′-pyridyl)-quinoline (hphbr-pq). The complexes studied are: [Ru(bpy)2L1](PF6)2 (C1), [Ru(bpy)2L2](PF6)2 (C2), [Os(bpy)2L1](PF6)2 (C3), [Os(bpy)2L2](PF6)2 (C4) (bpy = 2,2′-bipyridine), [Ru(dmbpy)2L1](PF6)2 (C5), [Ru(dmbpy)2L2](PF6)2 (C6), [Os(dmbpy)2L1](PF6)2 (C7), and [Os(dmbpy)2L2](PF6)2 (C8) (dmbpy = 4,4′-dimethyl-2,2′-bipyridine). Moreover, new functionalized complexes C9-C12 were obtained by the basecatalyzed direct alkylation of C2, C4, C6, and C8 with 6-bromo-1-hexene. The complete assignment of the 1H-NMR spectra for the two new ligands (L1 and L2), and their Ru(II) or Os(II) complexes has been accomplished using a combination of one- and two-dimensional NMR techniques. The JH,H values have been determined for the majority of the resonances.
Enhanced Temperature During Grain Filling Reduces Protein Concentration of Durum Wheat
Francesco Primo Vaccari,Roberto Ranieri,Alessandro Matese,Franco Miglietta
Italian Journal of Agronomy , 2011, DOI: 10.4081/ija.2007.393
Abstract: Durum wheat is cultivated over more than 13 millions of hectares (ha) world wide and Italy is the main European producer with 3.5 millions tons per year. The protein concentration of durum wheat is very important, it ensures high nutritional value and is highly appreciated by the pasta production industries. The protein concentration of wheat is determined during the grain filling period when carbon and nitrogen compounds are translocated into the grains. Air temperature affects translocation rates and contributes to final protein concentration of wheat grains. Two common commercial varieties of durum and bread wheat were exposed from anthesis to harvest, to a source of infrared radiation in the field. This allowed to investigate the relative effect of temperature on translocation of carbon and nitrogen compound during grain filling. The heat treatment imposed affected marginally dry mass accumulation of the grains in bread wheat and didn’t affect dry mass in durum wheat. Grain protein was affected by heat treatment in durum but not in bread wheat. Carbon accumulation rate was higher for durum than for bread wheat. The protein concentration was greater in durum than in bread wheat and we can assume that the absolute nitrogen accumulation rates were higher for the former species. Such difference may be either caused by a faster nitrogen uptake rate and translocation or a more efficient relocation of nitrogen accumulated in reserve organs.
Enhanced Temperature During Grain Filling Reduces Protein Concentration of Durum Wheat
Francesco Primo Vaccari,Roberto Ranieri,Alessandro Matese,Franco Miglietta
Italian Journal of Agronomy , 2008, DOI: 10.4081/ija.2007.393
Abstract: Durum wheat is cultivated over more than 13 millions of hectares (ha) world wide and Italy is the main European producer with 3.5 millions tons per year. The protein concentration of durum wheat is very important, it ensures high nutritional value and is highly appreciated by the pasta production industries. The protein concentration of wheat is determined during the grain filling period when carbon and nitrogen compounds are translocated into the grains. Air temperature affects translocation rates and contributes to final protein concentration of wheat grains. Two common commercial varieties of durum and bread wheat were exposed from anthesis to harvest, to a source of infrared radiation in the field. This allowed to investigate the relative effect of temperature on translocation of carbon and nitrogen compound during grain filling. The heat treatment imposed affected marginally dry mass accumulation of the grains in bread wheat and didn’t affect dry mass in durum wheat. Grain protein was affected by heat treatment in durum but not in bread wheat. Carbon accumulation rate was higher for durum than for bread wheat. The protein concentration was greater in durum than in bread wheat and we can assume that the absolute nitrogen accumulation rates were higher for the former species. Such difference may be either caused by a faster nitrogen uptake rate and translocation or a more efficient relocation of nitrogen accumulated in reserve organs.
Displacement across the Trecastagni Fault (Mt. Etna) and induced seismicity: the October 2009 to January 2010 episode
Salvatore Gambino,Alessandro Bonforte,Antonino Carnazzo,Giuseppe Falzone
Annals of Geophysics , 2011, DOI: 10.4401/ag-4841
Abstract: The Trecastagni Fault (TF) is a NNW-SSE tectonic structure inside Mt. Etna that is characterized by evident morphological scarps and normal and right-lateral type movements that directly affect roads and buildings. The TF has an important role in the instability that affects the south-eastern flank of Mt. Etna, and it represents part of the southern boundary of the unstable sector. Starting from 2005, the TF has been monitored using continuous wire extensometers and by carrying out periodic direct measurements across the northern and central sectors. From 2005 to September 2009, the measurements show that the TF has undergone continuous extension of about 2-3 mm/yr. During the October 2009 to January 2010 period, the creep rate of the TF reached up to 5.5 to 7.0 mm/yr, and this was accompanied by several shallow, low magnitude earthquakes that were felt by local people. This episode appears to be linked to the increase in the sliding velocity of the eastern flank that occurred during 2009.
Evidence of persistent seismo-volcanic activity at Marsili seamount
Antonino D'Alessandro,Giorgio Mangano,Giuseppe D'Anna
Annals of Geophysics , 2012, DOI: 10.4401/ag-5515
Abstract: The Marsili submarine volcano is the largest European volcano, and it can be considered as the key to our understanding of the dynamics of the spreading and back-arc lithosphere formation in the Tyrrhenian sector [Marani et al. 2004, and references therein]. Despite its size, it is very difficult to monitor due to its geographical position [D'Alessandro et al. 2011], and it still remains little known. In 2006, the Centro Nazionale Terremoti (National Earthquake Centre) of the Istituto Nazionale di Geofisica e Vulcanologia (INGV) deployed a broadband ocean-bottom seismometer with hydrophone (OBS/H) [Mangano et al. 2011] on the flat top of Marsili volcano, at a depth of ca. 790 m. In only nine days, the instrument recorded ca. 800 seismo-volcanic events [D'Alessandro et al. 2009]. This revealed the intense seismo-volcanic activity of Marsili volcano for the first time. […]
Meta-analysis of non-randomized studies in interventional cardiology: a critical appraisal
Eliano Pio Navarese,Alessandro Lupi,Antonino Buffon,Mara Sansa
Italian Journal of Public Health , 2009, DOI: 10.2427/5761
Abstract: Utilisation of meta-analysis is becoming more and more common in interventional cardiology. The aim of this statistical approach is to collect a large number of patients from randomized clinical studies and nonrandomized registries in order to obtain a pooled estimate of the results. Nevertheless, simply pooling these results without a correct methodological approach can easily lead to biased conclusions. In this report we analyse the possible methodological drawbacks of such an approach and we suggest a simplified check-list of items to be considered in the effort of building-up a meta-analysis from non-randomized studies.
Opportunities for Prevenar 13 vaccine in Campania Region: a budget impact analysis
Giorgio Liguori,Antonino Parlato,Alessandro Scaletti,Patrizia Belfiore
Italian Journal of Public Health , 2012, DOI: 10.2427/5624
Abstract: : Background: although the efficacy of pneumococcal vaccination for the more common serotypes of Streptococcus pneumoniae has been demonstrated, the 13-valent vaccine (Prevenar 13 ) is still offered in different ways in the Italian regional healthcare units, and in the region of campania, some local health authorities administer the vaccine free of charge whilst others practice a co-payment. Methods: we performed a budget impact analysis of the possible free administration of Prevenar 13 vaccine to all newborns in the campania region, by comparing two different delivery settings, one having an active vaccination program and another in which such program was absent. during the operation of the vaccination program, the number of expected cases with 50, 80 and 100% vaccine coverage in the popula- tion was considered. the economic advantage resulting from pneumococcal diseases deemed avoidable thanks to the vaccination was compared with the costs of the vaccination program. the analysis considered the direct costs in the 2 years after implementation of the vaccination program. costs were expressed in € euros 2010. Results: although we did not consider the benefits achievable in the 10 years following the vaccina- tion, nor the herd effects, we showed that offering anti-pneumococcal vaccination to all newborns could give economic advantages to the region, estimated as close to 1 million euros. Conclusion: the use of Prevenar 13 can be considered a greatly advantageous public health strategy....
Daptomycin efficacy in the central nervous system of a patient with disseminated methicillin-resistant Staphylococcus aureus infection: a case report
Taglietti Fabrizio,Campanile Floriana,Capone Alessandro,Di Caro Antonino
Journal of Medical Case Reports , 2012, DOI: 10.1186/1752-1947-6-264
Abstract: Introduction Staphylococcus aureus has emerged as a major nosocomial pathogen in the last decades and also represents the second most common pathogen isolated from patients in outpatient settings. Although methicillin-resistant S.aureus infections were traditionally limited to hospitals, community-associated cases of methicillin-resistant S.aureus infections have been reported. In our case, we observed an unexpected event during treatment. Case presentation A 60-year-old Caucasian man developed fever and multiple muscle and brain abscesses caused by Panton-Valentine leukocidin-negative community-associated methicillin-resistant S. aureus. Conclusion Although our patient was given antimicrobials active against the isolated methicillin-resistant S. aureus strain, it was only after the introduction of daptomycin that his skin, soft tissue and muscle lesions and also brain manifestations improved.
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