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Search Results: 1 - 10 of 144482 matches for " F. Piacentini "
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Experimental local realism tests without fair sampling assumption
G. Brida,M. Genovese,F. Piacentini
Physics , 2007, DOI: 10.1140/epjd/e2007-00194-5
Abstract: Following the theoretical suggestion of Ref. [1,2], we present experimental results addressed to test restricted families of local realistic models, but without relying on the fair sampling assumption.
Predictions of the Maximum Amplitude, Time of Occurrence, and Total Length of Solar Cycle 24
L. C. Uzal,R. D. Piacentini,P. F. Verdes
Physics , 2012, DOI: 10.1007/s11207-012-0030-9
Abstract: In this work we predict the maximum amplitude, its time of occurrence, and the total length of Solar Cycle 24 by linear regression to the curvature (second derivative) at the preceding minimum of a smoothed version of the sunspots time series. We characterise the predictive power of the proposed methodology in a causal manner by an incremental incorporation of past solar cycles to the available data base. In regressing maximum cycle intensity to curvature at the leading minimum we obtain a correlation coefficient R \approx 0.91 and for the upcoming Cycle 24 a forecast of 78 (90% confidence interval: 56 - 106). Ascent time also appears to be highly correlated to the second derivative at the starting minimum (R \approx -0.77), predicting maximum solar activity for October 2013 (90% confidence interval: January 2013 to September 2014). Solar Cycle 24 should come to an end by February 2020 (90% confidence interval: January 2019 to July 2021), although in this case correlational evidence is weaker (R \approx -0.56).
Joint multipartite photon statistics by on/off detection
G. Brida,M. Genovese,M. G. A. Paris,F. Piacentini
Physics , 2006, DOI: 10.1364/OL.31.003508
Abstract: We demonstrate a method to reconstruct the joint photon statistics of two or more modes of radiation using on/off photodetection performed at different quantum efficiencies. The two-mode case is discussed in details and experimental results are presented for the bipartite states obtained after a beam-splitter fed by a single photon state or a thermal state.
Un importante contributo allo studio degli apocrifi. Il Vangelo di Nicodemo in Polonia: tradizione latina e traduzione polacca An Important Contribution to the Studies on Apocryphal Literature. The Gospel of Nicodemus in Poland: Latin Textual Tradition and Polish Translation
Marcello Piacentini
Studi Slavistici , 2012,
Abstract: The critical edition of Gesta Pilati in the Polish translation, which was edited together with a Latin text of this famous account, is one of the most important outcomes for studies on apocryphal literature. Medievalist scholar Zbigniew Izydorczk points out that the 1509 Latin manuscript kept in the Jagellonian Library reflects the traces of the earliest Latin translation of this account. Polish philologist Wies aw Wydra demonstrates that the Polish translation dating back to the end of XV Century derives from the same redaction of the Latin text handed down by the 1509 manuscript. Yet some differences suggest that the 1509 manuscript is not the direct antigraph of the translation. Indeed there exists another witness (PAU 1713) which belongs to the same family as the 1509. The Polish translation clearly agrees partly with the 1509 one, partly with the PAU 1713 one. The critical edition of Gesta Pilati in the Polish translation, which was edited together with a Latin text of this famous account, is one of the most important outcomes for studies on apocryphal literature. Medievalist scholar Zbigniew Izydorczk points out that the 1509 Latin manuscript kept in the Jagellonian Library reflects the traces of the earliest Latin translation of this account. Polish philologist Wies aw Wydra demonstrates that the Polish translation dating back to the end of XV Century derives from the same redaction of the Latin text handed down by the 1509 manuscript. Yet some differences suggest that the 1509 manuscript is not the direct antigraph of the translation. Indeed there exists another witness (PAU 1713) which belongs to the same family as the 1509. The Polish translation clearly agrees partly with the 1509 one, partly with the PAU 1713 one.
Increased UV radiation due to polar ozone chemical depletion and vortex occurrences at southern sub-polar latitudes in the period (1997–2005)
A. F. Pazmino,S. Godin-Beekmann,E. A. Luccini,R. D. Piacentini
Atmospheric Chemistry and Physics Discussions , 2008,
Abstract: The variability of total ozone and UV radiation from Total Ozone Mapping Spectrometer (TOMS) measurements is analyzed as a function of polar vortex occurrences over the southern subpolar regions during the 1997–2005 period. The analysis of vortex occurrences showed high interannual variability in the 40° S–60° S latitude band with a longitudinal asymmetry showing the largest frequencies over the 90° W–90° E region. The impact of vortex occurrences on UV radiation and ozone in clear sky conditions was determined from the comparison between the measurements inside the vortex and a climatology obtained from data outside the vortex over the studied period. Clear sky conditions were determined from TOMS reflectivity data. For measurements outside the vortex, clear sky conditions were selected for reflectivity values lower than 7.5%, while for measurements inside the vortex, a relaxed threshold was determined from statistically similar UV values as a function of reflectivity. UV changes and ozone differences from the climatology were analyzed in the 40° S–50° S and 50° S–60° S latitude bands during the spring period (September to November). The largest UV increases and ozone decreases, reaching 200% and 65%, respectively, were found in the 50° S–60° S latitude band in September and October. The heterogeneous ozone loss during vortex occurrences was estimated using a chemical transport model. The largest impact of vortex occurrences was found in October with mean UV increase, total ozone decrease and accumulated ozone loss in the 350 K–650 K range of respectively 47%, 32% and 63%. The region close to South America is the most affected by the Antarctic ozone depletion due to the combined effect of large number of vortex occurrences, lower cloud cover and large ozone decrease. This region would be the most vulnerable in case of cloud cover decrease linked to climate change, due to more frequent occurrence of ozone poor air masses during austral spring.
Increased UV radiation due to polar ozone chemical depletion and vortex occurrences at Southern Sub-polar Latitudes in the period [1997–2005]
A. F. Pazmi?o,S. Godin-Beekmann,E. A. Luccini,R. D. Piacentini
Atmospheric Chemistry and Physics (ACP) & Discussions (ACPD) , 2008,
Abstract: The variability of total ozone and UV radiation from Total Ozone Mapping Spectrometer (TOMS) measurements is analyzed as a function of polar vortex occurrences over the southern subpolar regions during the 1997–2005 period. The analysis of vortex occurrences showed high interannual variability in the 40° S–60° S latitude band with a longitudinal asymmetry showing the largest frequencies over the 90° W–90° E region. The impact of vortex occurrences on UV radiation and ozone in clear sky conditions was determined from the comparison between the measurements inside the vortex and a climatology obtained from data outside the vortex over the studied period. Clear sky conditions were determined from TOMS reflectivity data. For measurements outside the vortex, clear sky conditions were selected for reflectivity values lower than 7.5%, while for measurements inside the vortex, a relaxed threshold was determined from statistically similar UV values as a function of reflectivity. UV changes and ozone differences from the climatology were analyzed in the 40° S–50° S and 50° S–60° S latitude bands during the spring period (September to November). The largest UV increases and ozone decreases, reaching ~200% and ~65%, respectively, were found in the 50° S–60° S latitude band in September and October. The heterogeneous ozone loss during vortex occurrences was estimated using a chemical transport model. The largest impact of vortex occurrences was found in October with mean UV increase, total ozone decrease and accumulated ozone loss in the 350–650 K range of, respectively, 47%, 30% and 57%. The region close to South America is the most affected by the Antarctic ozone depletion due to the combined effect of large number of vortex occurrences, lower cloud cover and large ozone decrease. This region would be the most vulnerable in case of cloud cover decrease, due to more frequent occurrence of ozone poor air masses during austral spring.
Constrained MaxLik reconstruction of multimode photon distributions
G. Brida,M. Genovese,A. Meda,S. Olivares,M. G. A. Paris,F. Piacentini
Physics , 2008, DOI: 10.1080/09500340802389805
Abstract: We address the reconstruction of the full photon distribution of multimode fields generated by seeded parametric down-conversion (PDC). Our scheme is based on on/off avalanche photodetection assisted by maximum-likelihood (MaxLik) estimation and does not involve photon counting. We present a novel constrained MaxLik method that incorporates the request of finite energy to improve the rate of convergence and, in turn, the overall accuracy of the reconstruction.
Bayesian method for the analysis of the dust emission in the Far-Infrared and Submillimeter
M. Veneziani,F. Piacentini,A. Noriega-Crespo,S. Carey,R. Paladini,D. Paradis
Physics , 2013, DOI: 10.1088/0004-637X/772/1/56
Abstract: We present a method, based on Bayesian statistics, to fit the dust emission parameters in the far-infrared and submillimeter wavelengths. The method estimates the dust temperature and spectral emissivity index, plus their relationship, taking into account properly the statistical and systematic uncertainties. We test it on three sets of simulated sources detectable by the Herschel Space Observatory in the PACS and SPIRE spectral bands (70-500 micron), spanning over a wide range of dust temperatures. The simulated observations are a one-component Interstellar Medium, and two two-component sources, both warm (HII regions) and cold (cold clumps). We first define a procedure to identify the better model, then we recover the parameters of the model and measure their physical correlations by means of a Monte Carlo Markov Chain algorithm adopting multi-variate Gaussian priors. In this process we assess the reliability of the model recovery, and of parameters estimation. We conclude that the model and parameters are properly recovered only under certain circumstances, and that false models may be derived in some case. We applied the method to a set of 91 starless cold clumps in an inter-arm region of the Galactic Plane with low star formation activity, observed by Herschel in the Hi-GAL survey. Our results are consistent with a temperature independent spectral index.
Flunisolide Decreases Exhaled Nitric Oxide and Nitrotyrosine Levels in Asthmatic Children
A. Bodini,D. G. Peroni,F. Zardini,M. Corradi,R. Alinovi,A. L. Boner,G. L. Piacentini
Mediators of Inflammation , 2006, DOI: 10.1155/mi/2006/31919
Abstract: Background. Exhaled nitric oxide (FeNO) has been reported to be elevated in the oxidative stress involved in asthmatic patients, and the reaction of nitric oxide (NO) with superoxide anions results in the formation of nitrotyrosine. The purpose of this study was to investigate the effect of inhaled steroid treatment on nitrotyrosine levels collected by exhaled breath condensate (EBC) and on FeNO. Methods. This was a single-blind placebo-controlled study. The lung function, FeNO, and nitrotyrosine levels were evaluated in 10 asthmatic children. Results. The nitrotyrosine levels were stable during the placebo period (T0 = 1.16 ng/ml versus T1 = 1.05 ng/ml; NS.), whereas they decreased after the treatment with flunisolide (T2 = 1.14 ng/ml versus T3 = 0.88 ng/ml; P<.001). No significant reduction in FeNO levels was observed after placebo treatment (T0 = 38.4 ppb versus T1 = 34.7 ppb, NS.). In contrast, FeNO values decreased significantly being at T3 = 14.9 ppb (T1 versus T3; P=.024). Conclusions. This study shows that corticosteroid treatment reduces nitrotyrosine levels in EBC of asthmatic subjects.
Seasonal and daily patterns of group size, cohesion and activity of the estuarine dolphin, Sotalia guianensis (P.J. van Bénéden) (Cetacea, Delphinidae), in southern Brazil
Daura-Jorge, Fábio G.;Wedekin, Leonardo L.;Piacentini, Vítor de Q.;Sim?es-Lopes, Paulo C.;
Revista Brasileira de Zoologia , 2005, DOI: 10.1590/S0101-81752005000400029
Abstract: the resident population of estuarine dolphin, sotalia guianensis (p.j. van bénéden, 1864), in norte bay, santa catarina, southern brazil, was studied from 2000 to 2003. systematic one-day cruises were undertaken aboard a 5 m sail boat equipped with an outboard motor. applying the focal-group method, information such as geographical position, predominant behavioural patterns, group size, cohesion index and the presence of calves, were registered at every five-minute interval, totalling 198 hours of direct observation of the dolphins. the estuarine dolphin used preferential areas for each behavioural pattern. the mean group size was approximately 29 individuals, and the presence of calves occurred throughout the entire year, but with a significant increase in the warm seasons. the frequency of behavioural patterns and group size varied according to season and time of day, and were strongly associated. the frequency of moving behaviours increased in the cold seasons and along the day. the seasonal variation in the moving behaviours suggest the requirement of a larger area in the cold seasons, probably related to seasonal fluctuations in the abundance of dominant prey items. higher group sizes were observed while dolphins were foraging. the cohesion index also varied according to the behaviour. our results showed that group organization and behavioural patterns of this estuarine dolphin population are probably linked to daily and seasonal environment cycles, and also possibly to the condition of being at the furthest southern limit of distribution of the species.
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