102,290 research outputs found
Erratum to: Effect of moderate red wine intake on cardiac prognosis after recent acute myocardial infarction of subjects with Type 2 diabetes mellitus (Diabetic Medicine, (2006), 23, 9, (974-981), 10.1111/j.1464-5491.2006.01886.x)
No full textIn an article by Marfella et al, the author name C. Saron is incorrect and should be listed as C. Sardu. Therefore the correct author list is: R. Marfella, F. Cacciapuoti, M. Siniscalchi, F. C. Sasso, F. Marchese, F. Cinone, E. Musacchio, M. A. Marfella, L. Ruggiero, G. Chiorazzo, D. Liberti, G. Chiorazzo, G. F. Nicoletti, C. Sardu, F. D'Andrea, C. Ammendola, M. Verza and L. Coppola.In an article by Marfella et al, the author name C. Saron is incorrect and should be listed as C. Sardu. Therefore the correct author list is: R. Marfella, F. Cacciapuoti, M. Siniscalchi, F. C. Sasso, F. Marchese, F. Cinone, E. Musacchio, M. A. Marfella, L. Ruggiero, G. Chiorazzo, D. Liberti, G. Chiorazzo, G. F. Nicoletti, C. Sardu, F. D'Andrea, C. Ammendola, M. Verza and L. Coppola
Scale Invariant Effective Hamiltonians for a Graph with a Small Compact Core
No full textWe consider a compact metric graph of size ε and attach to it several edges (leads) of length of order one (or of infinite length). As ε goes to zero, the graph G ε obtained in this way looks like the star-graph formed by the leads joined in a central vertex. On G ε we define an Hamiltonian H ε , properly scaled with the parameter ε . We prove that there exists a scale invariant effective Hamiltonian on the star-graph that approximates H ε (in a suitable norm resolvent sense) as ε → 0 . The effective Hamiltonian depends on the spectral properties of an auxiliary ε -independent Hamiltonian defined on the compact graph obtained by setting ε = 1 . If zero is not an eigenvalue of the auxiliary Hamiltonian, in the limit ε → 0 , the leads are decoupled
Measuring the Newtonian constant of gravitation G with an atomic interferometer
No full textWe have recently completed a measurement of the
Newtonian constant of gravitation G using atomic
interferometry. Our result is G = 6.67191(77)(62) ×
10 −11 m 3 kg −1 s −2 where the numbers in parenthesis
are the type A and type B standard uncertainties,
respectively. An evaluation of the measurement
uncertainty is presented and the perspectives for
improvement are discussed. Our result is approaching
the precision of experiments based on macroscopic
sensing masses showing that the next generation
of atomic gradiometers could reach a total relative
uncertainty in the 10 parts per million range
Leopardi. Dychanie vecnosti
No full textTraduzione in lingua russa del saggio critico cura di F. Cacciapuoti, e di brani scelti dell'opera di Giacomo Leopardi. Catalogo mostra Tolstoj Leopardi. Il respiro dell'anima (Recanati / Jasnaja Poljana-Tula, 2011
Beyond the Gold Standard: Linear Regression and Poisson GLM Yield Identical Mortality Trends and Deaths Counts for COVID-19 in Italy: 2021–2025
No full textWhile it is undisputed that Poisson GLMs represent the gold standard for counting COVID-19 deaths, recent studies have analyzed the seasonal growth and decline trends of these deaths in Italy using a simple segmented linear regression. They found that, despite an overall decreasing trend throughout the entire period analyzed (2021–2025), rising mortality trends from COVID-19 emerged in all summers and winters of the period, though they were more pronounced in winter. The technical reasons for the general unsuitability of using linear regression for the precise counting of deaths are well-known. Nevertheless, the question remains whether, under certain circumstances, the use of linear regression can provide a valid and useful tool in a specific context, for example, to highlight the slopes of seasonal growth/decline in deaths more quickly and clearly. Given this background, this paper presents a comparison between the use of linear regression and a Poisson GLM with the aforementioned death data, leading to the following conclusions. Appropriate statistical hypothesis testing procedures have demonstrated that the conditions of a normal distribution of residuals, their homoscedasticity, and the lack of autocorrelation were essentially guaranteed in this particular Italian case (weekly COVID-19 deaths in Italy, from 2021 to 2025) with very rare exceptions, thus ensuring the acceptable performance of linear regression. Furthermore, the development of a Poisson GLM definitively confirmed a strong agreement between the two models in identifying COVID-19 mortality trends. This was supported by a Kolmogorov–Smirnov test, which found no statistically significant difference between the slopes calculated by the two models. Both the Poisson and the linear model also demonstrated a comparably high accuracy in counting COVID-19 deaths, with MAE values of 62.76 and a comparable 88.60, respectively. Based on an average of approximately 6300 deaths per period, this translated to a percentage error of just 1.15% for the Poisson and only a slightly higher 1.48% for the linear model
Opere . Poesia e prosa
No full textTraduzione in lingua russa del saggio critico cura di F. Cacciapuoti, e di brani scelti dell'opera di Giacomo Leopardi. Catalogo mostra Tolstoj Leopardi. Il respiro dell'anima (Recanati / Jasnaja Poljana-Tula, 2011
Determination of the Newtonian Gravitational Constant Using Atom Interferometry
No full textWe present a new measurement of the Newtonian gravitational constant G based on cold atom interferometry. Freely falling samples of laser-cooled rubidium atoms are used in a gravity gradiometer to probe the field generated by nearby source masses. In addition to its potential sensitivity, this method is intriguing as gravity is explored by a quantum system. We report a value of G = 6.667 · 10^(−1)1 m^3 kg^(−1) s^(−2), estimating a statistical uncertainty of
±0.011 · 10^(−11) m^3 kg^(−1) s^(−2) and a systematic uncertainty of
±0.003 · 10^(−11) m^3 kg^(−1) s^(−2). The long-term stability of the instrument
and the signal-to-noise ratio demonstrated here open interesting perspectives for pushing the measurement accuracy below the 100 ppm level
LEFT VENTRICULAR FUNCTION IN THE SUCCESSIVE PHASES OF SYSTEMIC HYPERTENSION EVALUATED WITH PULSED DOPPLER ECHOCARDIOGRAPHY
No full text- …
