590 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
The semi-classical limit with a delta-prime potential
No full textWe consider the quantum evolution e(-it/)((h) over barH beta)psi((h) over bar )(xi)of a Gaussian coherent state psi((h) over bar)(xi) is an element of L-2(R) localized close to the classical state xi (q, p) is an element of R-2, where H-beta denotes a self-adjoint realization of the formal Hamiltonian -(h) over bar (2)/2m d(2)/dx(2) + beta delta(0)' with delta(0)' the derivative of Dirac's delta distribution at x = 0 and beta a real parameter. We show that in the semi-classical , limit such a quantum evolution can be approximated (with respect to the L-2(R)-norm, uniformly for any t is an element of R away from the collision time) by e(i/)((h) over bar At) e(itLB )phi((h) over bar)(x), where A(t) = p(2)t/2m, phi((h) over bar)(x)(xi) := psi((h) over bar)(xi)(x) and L-B is a suitable self-adjoint extension of the restriction to C-c(infinity)(M-0), M-0 := {(q, p) is an element of R-2 vertical bar q not equal 0}, of (-i times) the generator of the free classical dynamics. While the operator L-B here utilized is similar to the one appearing in our previous work [C. Cacciapuoti, D. Fermi and A. Posilicano, The semi-classical limit with a delta potential, Ann. Mat. Pura Appl. 200 (2021) 453-489], in the present case the approximation gives a smaller error: it is of order (h) over bar (7/2)(-lambda), 0 < lambda < 1/2, whereas it turns out to be of order (h) over bar (3/2-lambda), 0 < lambda < 3/2, for the delta potential. We also provide similar approximation results for both the wave and scattering operators
Quel S. Giacomo (e altri dipinti) di Nicola Cacciapuoti a Monteforte
No full textAttraverso un attento studio di ricerca l’autore attribuisce i dipinti che sono nell’altare maggiore della Chiesa di San Nicola a Monteforte Irpino al pittore giuglianese Nicola Cacciapuoti, allievo del Solimena e di Domenico Antonio Vaccaro. In particolare egli evidenzia l’accostamento del Cacciapuoti, tra il 1742 e il 1748, anche allo stile di Francesco De Mura. Attraverso un’analisi stilistica ed iconografica dei dipinti, emerge la figura di Nicola Cacciapuoti, di considerevole spessore culturale e protagonista nell’ambito della pittura della prima metà del Settecento nel Meridione. Il lavoro contribuisce a far luce su un pittore sinora ancora non sufficientemente conosciuto ed ap prezzato come merita.Through a careful research study, the author attributes the paintings that are in the high altar of the Church of San Nicola in Monteforte Irpino to the Giugliano’s painter Nicola Cacciapuoti, a pupil of Solimena and Domenico Antonio Vaccaro. In particular, he highlights the combination of Cacciapuoti, between 1742 and 1748, with the style of Francesco De Mura. Through a stylistic and iconographic analysis of the paintings, the considerable cultural value of Nicola Cacciapuoti emerges as protagonist in the painting of the first half of the eighteenth century in the South Italy. The current study helps to shed light on a painter not yet sufficiently known and appreciated as he deserves
Kreĭn formula and convergence of hamiltonians with scaled potentials in dimension one
No full textIn this brief report we study the convergence of the Hamiltonian hε := −(⋅)′′ + V (x∕ε)∕ε2 in dimension one as ε goes to zero. This problem has already been studied in several former works (also in the more general setting of metric graphs) and the results that we present here are not new. Aim of this work is to formulate the problem in the setting of metric graphs and to exploit an approach based on a Kreı̆n formula for the resolvent of hε. Such a formula allows to mark out the rôle of the zero eigenvalue for an auxiliary Hamiltonian. The existence of the zero eigenvalue is responsible of the coupling in the limiting Hamiltonian, otherwise hε converges in norm resolvent sense to the direct sum of two Dirichlet Laplacians on the half-line. In a forthcoming paper such approach will be generalized to the study of an analogous problem on metric graphs with a small compact core
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
Toward the Quantum Internet: A Directional-dependent Noise Model for Quantum Signal Processing
No full textAfter decades of pure science phase, the research on quantum technologies is finally reaching the engineering phase, getting out of the labs into business reality. Quantum technologies relies on quantum bits, aka qubits, which are the equivalent of classical bits used in classical information processing. Similarly to bits, the information stored in qubits can be corrupted by classical noise. Differently from bits, qubits are also vulnerable to quantum noise, a type of noise with no counterpart in the classical world. Hence, it becomes crucial to understand, from an engineering perspective, how the quantum noise corrupts the information stored within a qubit. To this aim, in this invited paper, we overview the effects of the quantum noise on an arbitrary qubit from a signal-processing perspective
Echocardiographic evaluation of the right heart function and pulmonary vascular bed
No full textAbstract The aim of this review was to describe the
different ultrasonic modalities to non-invasively evaluate
right cardiac chambers and pulmonary vascular
bed function. M-Mode, 2-D, conventional pulsed
doppler, tissue doppler imaging (TDI), strain rate
imaging (SRI) and 3D echocardiography are illustrated
in order to obtain both regional and global right
heart and pulmonary function. The results have a good
correlation with other invasive and non-invasive
diagnostic techniques, as magnetic resonance imaging
(MRI). All these echocardiograpic techniques can be
employed to evaluate the morphologic and functional
pictures of right heart and pulmonary circulation in
presence of pulmonary hypertension (PH). The hemodynamic
profile obtained consent to anatomically and
functionally characterize PH. But, other experiences
performed on more wide range of healthy and PH
patients are necessary to confirm the described result
- …
